Toner and image forming apparatus
阅读说明：本技术 调色剂 (Toner and image forming apparatus ) 是由 大久保显治 丰田隆之 下田卓 河村政志 于 2020-04-16 设计创作，主要内容包括：本发明涉及调色剂。一种调色剂,其包括包含树脂A的调色剂颗粒,其中树脂A含有酯键,并且在其分子中具有取代或未取代的甲硅烷基,取代的甲硅烷基上的取代基是选自由烷基、烷氧基、羟基、芳基和卤素原子组成的组中的至少一种；并且树脂A中的酯键的含量为12.0质量％以上。(The present invention relates to a toner. A toner comprising toner particles containing a resin a, wherein the resin a contains an ester bond and has a substituted or unsubstituted silyl group in a molecule thereof, and a substituent on the substituted silyl group is at least one selected from the group consisting of an alkyl group, an alkoxy group, a hydroxyl group, an aryl group, and a halogen atom; and the content of ester bonds in the resin A is 12.0 mass% or more.)
1. A toner comprising toner particles containing a resin A, characterized in that
The resin A contains an ester bond and has a substituted or unsubstituted silyl group in its molecule,
the substituent on the substituted silyl group is at least one selected from the group consisting of an alkyl group, an alkoxy group, a hydroxyl group, an aryl group and a halogen atom; and
the content of the ester bond in the resin A is 12.0 mass% or more.
2. The toner according to claim 1, wherein the resin a contains a resin represented by the following formula (1):
in formula (1), P1Represents a polymer moiety having an ester bond; l is1Represents a single bond or a divalent linking group; r1To R3Each independently represents a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, a hydroxyl group, or an aryl group; and m represents a positive integer; and
when m is 2 or more, plural L1Are the same as or different from each other; plural R1Are the same as or different from each other; plural R2Are the same as or different from each other; and a plurality of R3The same as each other or different from each other.
3. The toner according to claim 2, wherein L is1Is a structure represented by the following formula (2):
in formula (2), represents a group represented by formula (I) and said P1The bonding site of (3); represents a bonding site to Si; and R 5Represents a single bond, alkylene, or arylene.
4. The toner according to claim 2 or 3, wherein R is1To R3At least one of them represents an alkoxy group or a hydroxyl group.
5. The toner according to claim 2 or 3, wherein R is1To R3Each independently represents an alkoxy group or a hydroxyl group.
6. The toner according to any one of claims 1 to 3, wherein a content of the ester bond in the resin A is 15.0% by mass or more.
7. The toner according to any one of claims 1 to 3, wherein a silicon atom content in the resin A is from 0.02 mass% to 10.00 mass%.
8. The toner according to any one of claims 1 to 3, wherein the resin A contains a polyester moiety.
9. The toner according to any one of claims 1 to 3, wherein the resin A contains a monomer unit derived from a compound having an aromatic ring as a constituent component.
10. The toner according to any one of claims 1 to 3, wherein the resin A contains a monomer unit derived from a trihydric or higher polyhydric alcohol or a trihydric or higher polycarboxylic acid as a constituent component.
11. The toner according to any one of claims 1 to 3, wherein the resin A has a weight average molecular weight of 3000 to 100000.
Technical Field
The present invention relates to a toner used in a recording method using, for example, an electrophotographic system.
Background
In recent years, image forming apparatuses such as copiers, printers, and the like have experienced an increasing diversification in the purpose of use and the environment of use, and in conjunction with this, have experienced demands for higher speeds and higher image quality.
A number of methods are known for electrophotographic systems. In an electrophotographic system, an electrostatic latent image is generally formed on an electrostatic image bearing member (hereinafter also referred to as "photosensitive member") by various means by using a photoconductive material. Then, the latent image is visualized by development with toner, and the toner image is transferred to a recording medium such as paper as needed. Then, the toner image on the recording medium is fixed using, for example, heat or pressure to obtain a copy. Copiers and printers are examples of image forming apparatuses using such electrophotographic systems.
These copying machines and printers are required to go up by rapid charging of toner so as to coexist with high speed and high image quality. Regarding this problem, a large number of techniques have been disclosed.
Japanese patent application laid-open No.2001-343787 discloses a technique of improving charge performance by using a nonlinear polyester resin containing a metal compound of an aromatic hydroxycarboxylic acid having a central metal of 3 or more as a binder resin.
Japanese patent application laid-open No.2011-138000 discloses a technique for inducing improvement of charge rising property by using a polyester resin containing an aromatic ring having a methoxy group, a hydroxyl group and a carboxyl group.
Japanese patent application laid-open No.2018-151629 discloses a technique of causing improvement of charge rising property by specifying the proportion of an aromatic carboxylic acid in a carboxylic acid component constituting a polyester resin.
Disclosure of Invention
However, even with the toner described in the aforementioned document, the charge rising characteristics particularly under a high-temperature and high-humidity environment are not satisfactory, and further improvement is required.
The invention provides a toner which exhibits excellent charge rising performance under a high-temperature and high-humidity environment.
The present invention relates to a toner comprising toner particles comprising a resin A, wherein
The resin A contains an ester bond and has a substituted or unsubstituted silyl group in its molecule,
the substituent on the substituted silyl group is at least one selected from the group consisting of an alkyl group, an alkoxy group, a hydroxyl group, an aryl group and a halogen atom; and
the content of ester bonds in the resin a is 12.0 mass% or more.
The present invention can provide a toner exhibiting excellent charge rising performance under a high-temperature and high-humidity environment.
Further features of the present invention will become apparent from the following description of exemplary embodiments with reference to the attached drawings.
Drawings
Fig. 1 is a schematic diagram of a measuring instrument for an amount of charge.
Detailed Description
The embodiments are described in detail below, but this should not be construed as meaning that the invention is limited to or by the following description.
The expression "XX is more than and YY is less than" or "XX to YY" indicating a numerical range in the present invention means a numerical range including a lower limit and an upper limit as endpoints unless otherwise specifically noted.
In addition, the monomer unit refers to a form in which the monomer material has reacted in the polymer or resin.
The toner is a toner comprising toner particles containing a resin A, wherein
The resin A contains an ester bond and has a substituted or unsubstituted silyl group in its molecule,
The substituent on the substituted silyl group is at least one selected from the group consisting of an alkyl group, an alkoxy group, a hydroxyl group, an aryl group and a halogen atom; and
the content of ester bonds in the resin a is 12.0 mass% or more.
By adopting the above-described configuration for the toner, the toner exhibits excellent charge rising characteristics under a high-temperature and high-humidity environment. Although the detailed reason is not clear, it is presumed as follows.
The conventional toner achieves improvement in charge rising property by using a high-polarity material in the toner. For example, according to Japanese patent application laid-open No.2018-151629, the charge rising property is improved by using an aromatic carboxylic acid.
When a highly polar material is used, the charge rising property in a low humidity environment is improved. However, polar materials are prone to moisture absorption in high humidity environments. Once the polar material absorbs moisture, the electric resistance decreases due to the influence of water, and then charge leakage eventually occurs, with the result that the charge rising performance decreases.
As a result, the conventional method of improving the charge rising property by using a polar material having a carboxyl group or a sulfo group is not sufficient for improving the charge rising property under a high-humidity environment, although the charge rising property under a low-humidity environment can be improved.
On the other hand, with the above toner, by charge transfer between an ester bond and a silicon atom in the resin a, the charge of the toner surface is diffused and additional charging is made possible. As a result, the charge rising property can be improved without using a high polarity material.
In more detail, it is considered that polarization occurs in C ═ O in the ester bond due to the difference in electronegativity between carbon and oxygen. In addition, when silicon atoms (Si) are present in the vicinity thereof, polarization is also generated between Si and O. Charge transfer occurs through mediation of polarization within C ═ O and between Si and O.
Thereby, the electric charge generated on the toner surface by triboelectric charging diffuses via charge transfer at the resin a containing an ester bond and containing a substituted or unsubstituted silyl group in the molecule, and then the charge density of the toner surface is lowered. As a result, the toner surface may undergo further charging and as a result, rapid charging may occur.
In addition, since the ester bond having a polarity smaller than that of the carboxyl group and the sulfo group contributes to the charge rising performance, moisture absorption is more difficult even in a high-humidity environment. This improves the charge rising performance even under a high-humidity environment.
The resin a contains an ester bond and has a substituted or unsubstituted silyl group in its molecule, wherein the substituent on the substituted silyl group is at least one selected from the group consisting of an alkyl group, an alkoxy group, a hydroxyl group, an aryl group, and a halogen atom.
The term "containing an ester bond" refers to the introduction of a characteristic group (-CO-O-), which is a carboxylic ester.
The resin a should satisfy the above conditions, but is not otherwise particularly limited; there may be exemplified a resin having an ester bond provided by a reaction such as a silane coupling agent or a hydrosilane, a polymer having an ester bond of an organosilane compound, and the aforementioned hybrid resin having an ester bond.
On a more specific level, examples are silane-modified vinyl resins, silane-modified polyester resins, silane-modified polycarbonate resins, silane-modified polyurethane resins, silane-modified phenolic resins, silane-modified epoxy resins, silane-modified polyolefin resins, silicone-modified resins, and the like, in each case having an ester bond.
The ester bond may be present initially as a constituent component of the resin, or may be introduced thereafter, for example, by dehydration condensation between a resin having a carboxyl group (or a hydroxyl group) and an alcohol (or a carboxylic acid).
The silane-modified vinyl-based resin having an ester bond may be exemplified by silane-modified vinyl-based resins having an ester bond produced by, for example, vinyl polymerization of a vinyl compound having an ester bond and a vinyl compound having a substituted or unsubstituted silyl group.
For example, the following may be used as the vinyl compound having an ester bond: methyl acrylate, ethyl acrylate, butyl acrylate, octyl acrylate, dimethylaminoethyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate, dimethylaminoethyl methacrylate, and vinyl acetate.
For example, the following may be used as the vinyl compound having a substituted silyl group: vinyltrichlorosilane, vinyltrimethoxysilane, vinyltriethoxysilane, vinylmethyldimethoxysilane, and vinyltris (2-methoxyethoxy) silane.
The silane-modified vinyl resin having an ester bond can be obtained by the vinyl polymerization described above, and other components can be polymerized to adjust the characteristics.
Examples of this aspect are styrene; substituted styrenes such as vinyl toluene; substituted vinyl naphthalenes; and ethylene, propylene, vinyl methyl ether, vinyl ethyl ether, vinyl methyl ketone, butadiene, isoprene, maleic acid, and maleates.
The production method of the vinyl polymer is not particularly limited, and a known method can be used. A single one of these compounds may be used, or a combination of a plurality of these compounds may be used.
In addition, from the viewpoint of the charge rising performance under a high-temperature and high-humidity environment, the resin a preferably contains an ester bond in the main chain of, for example, a silane-modified polyester resin or the like. For example, the resin a may contain a polyester segment (polyester segment). This makes it easier to control the ester bond content.
The resin a preferably contains a resin represented by the following formula (1), and more preferably a resin represented by the following formula (1).
(in the formula (1), P1Represents a polymer moiety having an ester bond; l is1Represents a single bond or a divalent linking group; r1To R3Each independently represents a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, a hydroxyl group, or an aryl group; and m represents a positive integer. When m is 2 or more, plural L1May be the same as or different from each other; plural R1May be the same as or different from each other; plural R2May be the same as or different from each other; and a plurality of R3May be the same as each other or different from each other. )
With the resin represented by formula (1), a silicon atom (Si) exists in a side chain or terminal position of the resin, and charge transfer can be easily performed. This further improves the charge rising performance.
The content of the ester bond in the resin a is 12.0 mass% or more, and preferably 15.0 mass% or more, from the viewpoint of the charge rising property under a high-temperature and high-humidity environment. On the other hand, the upper limit of the content is not particularly limited, but is preferably 70.0% by mass or less, and more preferably 60.0% by mass or less. Any combination of these may be used as the numerical range herein.
The silicon atom content in the resin a is preferably 0.02 to 10.00 mass%, more preferably 0.10 to 5.00 mass%, and still more preferably 0.15 to 2.00 mass%.
The resin represented by formula (1) can bring about additional improvement in charge rising performance under a high-temperature and high-humidity environment.
R in the formula (1)1To R3Each independently represents a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, a hydroxyl group, or an aryl group.
The number of carbons in the alkyl group is preferably 1 to 4, and more preferably 1 to 3.
The number of carbons in the alkoxy group is preferably 1 to 4, and more preferably 1 to 3.
The carbon number in the aryl group is preferably 6 to 12, and more preferably 6 to 10.
In the foregoing, R in the formula (1)1To R3At least one of them preferably represents an alkoxy group or a hydroxyl group. More preferably, R in formula (1)1To R 3Each independently represents an alkoxy group or a hydroxyl group.
Such a construction provides improved resistance to hot offset. This is considered to be due to the following reasons: the alkoxysilyl group or silanol group present in the resin forms a siloxane bond due to heating at the time of fixing, and the viscosity of the resin increases, and as a result, generation of internal peeling (deletion) of the toner, which is a cause of hot offset, is suppressed.
In order to make R in the formula (1)1To R3Is hydroxy, for example, may be substituted for R1To R3The resin in which at least one of them is an alkoxy group is hydrolyzed to convert the alkoxy group into a hydroxyl group.
Any method may be used for hydrolysis, and the following process is an example.
Wherein R in formula (1)1To R3The resin in which at least one of the alkoxy groups is dissolved or suspended in a suitable solvent (which may be a polymerizable monomer), the pH is adjusted to acidity using an acid or a base, and mixing and hydrolysis are performed.
Hydrolysis may also be performed during toner particle production.
P in the formula (1)1There should be a high molecular site (for example, a polymer site) having an ester bond, but is not otherwise particularly limited. Examples herein are a polyester site, a vinyl polymer site having an ester bond (e.g., a styrene-acrylic copolymer site), a polyurethane site, a polycarbonate site, a phenol resin site having an ester bond, and a polyolefin site having an ester bond.
When in the foregoing, P1When the polyester moiety is contained, the charge rising performance under a high-temperature and high-humidity environment is further improved.
L1Represents a single bond or a divalent linking group, wherein the divalent linking group may be exemplified by alkylene groups, phenylene groups, and structures given by the following formulae (2), (3), (4), and (5). The alkylene group and the phenylene group may be substituted with a substituent. Such substituents may be exemplified by methyl groups, alkoxy groups, hydroxyl groups, halogen atoms, and combinations of the foregoing. The alkylene group preferably has 1 to 12 carbons and more preferably has 1 to 4 carbons.
From the viewpoint of tape peeling property, a structure represented by the following formula (2) is preferable.
(in the formula (2).; represents a group represented by formula (I) and P1The bonding site of (3); represents a bonding site to Si; and R5Represents a single bond, alkylene, or arylene. )
The number of carbons in the alkylene group is preferably 1 to 12, and more preferably 1 to 3.
The carbon number in the arylene group is preferably 6 to 12, and more preferably 6 to 10.
It was found that the use of this structure provides an improvement in the tape release property after toner fixing. This is presumably due to the high affinity between the amide bond and the hydroxyl group present in the cellulose constituting the fiber of the paper as the fixing medium.
For P in the formula (1) 1Embodiments of the case containing polyester sites provide further description; however, this should not be construed as limiting thereof.
The polyester moiety is a polymer moiety having an ester bond (-CO-O-) in a repeating unit of the main chain. Examples here are polycondensate structures between polyols (alcohol components) and polycarboxylic acids (carboxylic acid components). A specific example is a high molecular site in which a structure represented by the following formula (6) (a structure derived from a dicarboxylic acid) and at least one structure selected from the group consisting of the formulae (7) to (9) given below (a structure derived from a diol) are bonded in such a manner as to form an ester bond. This may also be a polymer site in which a structure represented by formula (10) given below (a structure derived from a compound having a carboxyl group and a hydroxyl group in a single molecule) is bonded in such a manner as to form an ester bond.
From the viewpoint of charge rising performance under a high-temperature and high-humidity environment, introduction of a monomer unit derived from a compound having an aromatic ring as a constituent component in a polyester site is preferable. Examples are embodiments in which the content of the structure given by the following formula (8) in the polyester portion is 50% by mass or more, 60% by mass or more, or 70% by mass or more, and 85% by mass or less.
(in the formula (6), R9Represents an alkylene group, an alkenylene group, or an arylene group. )
(in the formula (7), R10Represents an alkylene group or a phenylene group. )
(in the formula (8), R18Represents an ethylene group or a propylene group. x and y are each an integer value of 0 or more, and the average value of x + y is 2 to 10. )
(in the formula (10), R11Represents an alkylene group or an alkenylene group. )
In the formula (6), R9The alkylene group (preferably having 1 to 12 carbons) represented may be exemplified as follows:
methylene, ethylene, trimethylene, propylene, tetramethylene, hexamethylene, neopentylene (neopentylene group), heptamethylene, octamethylene, nonamethylene, decamethylene, undecamethylene, dodecamethylene, 1, 3-cyclopentylene, 1, 3-cyclohexylene, and 1, 4-cyclohexylene.
In the formula (6), R9The alkenylene group (preferably having 2 to 4 carbons) represented may be exemplified by vinylene, propenylene, and 2-butenylene.
In the formula (6), R9The arylene group (preferably having 6 to 12 carbons) represented may be exemplified by 1, 4-phenylene, 1, 3-phenylene, 1, 2-phenylene, 2, 6-naphthylene, 2, 7-naphthylene, and 4, 4' -biphenylene.
R in the formula (6)9May be substituted by a substituent. Examples of the substituent in this case are a methyl group, a halogen atom, a carboxyl group, a trifluoromethyl group, and a combination thereof.
In the formula (7), R10The alkylene group (preferably having 1 to 12 carbons) represented may be exemplified as follows:
methylene, ethylene, trimethylene, propylene, tetramethylene, hexamethylene, neopentylene, heptamethylene, octamethylene, nonamethylene, decamethylene, undecamethylene, dodecamethylene, 1, 3-cyclopentylene, 1, 3-cyclohexylene, and 1, 4-cyclohexylene.
In the formula (7), R10The phenylene group represented may be exemplified by 1, 4-phenylene, 1, 3-phenylene, and 1, 2-phenylene.
R in the formula (7)10May be substituted by a substituent. Examples of the substituent in this case are a methyl group, an alkoxy group, a hydroxyl group, a halogen atom, and a combination thereof.
In the formula (10), R11The alkylene group (preferably having 1 to 12 carbons) represented may be exemplified as follows:
methylene, ethylene, trimethylene, propylene, tetramethylene, hexamethylene, neopentylene, heptamethylene, octamethylene, nonamethylene, decamethylene, undecamethylene, dodecamethylene, and 1, 4-cyclohexylene.
In the formula (10), R11The alkenylene group (preferably having 2 to 40 carbons) represented may be exemplified as follows:
vinylene, propenylene, butenylene, butadienylene, pentenylene, hexenylene, hexadienylene, heptenylene, octenylene, decenylene, octadecenylene, eicosenylene, and triacontenylene.
These alkenylene groups may have any of the following structures: linear, branched, and cyclic. The position of the double bond may be at any position, and at least one or more double bonds may be present.
R in the formula (10)11May be substituted by a substituent. Examples of the substituent in this case are an alkyl group, an alkoxy group, a hydroxyl group, a halogen atom, and a combination of the foregoing.
On the other hand, polycarboxylic acids (carboxylic acid components) may be exemplified by the following carboxylic acids:
dicarboxylic acids such as maleic acid, fumaric acid, citraconic acid, itaconic acid, glutaric acid, phthalic acid, isophthalic acid, terephthalic acid, 2, 6-naphthalenedicarboxylic acid, succinic acid, adipic acid, sebacic acid, azelaic acid, and malonic acid. Preferred among these are maleic acid, fumaric acid, and terephthalic acid.
The carboxylic acids of three or more members may be exemplified by:
1,2, 4-benzenetricarboxylic acid, 2,5, 7-naphthalenetricarboxylic acid, 1,2, 4-butanetricarboxylic acid, 1,2, 5-hexanetricarboxylic acid, 1, 3-dicarboxy-2-methyl-2-methylenecarboxypropane, 1,2, 4-cyclohexanetricarboxylic acid, tetra (methylenecarboxy) methane, 1,2,7, 8-octanetetracarboxylic acid, pyromellitic acid, and Empol trimer acid, as well as the aforementioned anhydrides and lower alkyl esters.
One of these dicarboxylic acids may be used alone, or two or more of these dicarboxylic acids may be used in combination, and one of these tribasic or higher carboxylic acids may be used alone, or two or more of these carboxylic acids may be used in combination.
From the viewpoint of the charge rising performance under a high-temperature and high-humidity environment, the incorporation of a monomer unit derived from a trihydric or higher polyhydric alcohol or a trihydric or higher polycarboxylic acid as a constituent component in the polyester site is preferable. Examples here are embodiments in which the content of monomer units derived from a trihydric or higher polyhydric alcohol or a trihydric or higher polycarboxylic acid in the polyester site is 0.1% by mass or more, 0.3% by mass or more, or 0.5% by mass or more, and 5.0% by mass or less.
As described above, the structures represented by the following formulae (2), (3), (4) and (5) are L in formula (1)1But are not particularly limited thereto.
(R in the formula (2))5Represents a single bond, alkylene, or arylene. (. sup.) represents P in the formula (1)1And (×) represents a bonding site with a silicon atom (Si) in formula (1). )
(R in the formula (3))6Represents a single bond, alkylene, or arylene. (. sup.) represents P in the formula (1)1And (×) represents a bonding site with a silicon atom (Si) in formula (1). )
For R6The number of carbons in the alkylene group is preferably 1 to 12 and more preferably 1 to 3.
The carbon number in the arylene group is preferably 6 to 12 and more preferably 6 to 10.
R in (formulae (4) and (5)7And R8Each independently represents a single bond, an alkylene group, an arylene group, or an oxyalkylene group. (. sup.) represents P in the formula (1)1And (×) represents a bonding site with a silicon atom (Si) in formula (1). )
For R7And R8The number of carbons in the alkylene group is preferably 1 to 12 and more preferably 1 to 3.
The carbon number in the arylene group is preferably 6 to 12 and more preferably 6 to 10.
The carbon number in the oxyalkylene group is preferably 1 to 12 and more preferably 1 to 3.
The structure represented by formula (2) is a divalent linking group comprising an amide bond.
The linking group is not limited to the case of being formed by reaction. In the case where a linking group is formed by the reaction to produce the resin represented by formula (1), for example, a compound having a carboxyl group may be reacted with an aminosilane compound (e.g., a compound containing an amino group and an alkoxysilyl group, a compound containing an amino group and an alkylsilyl group, and the like).
The aminosilane compound is not particularly limited, but may be exemplified by gamma-aminopropyltriethoxysilane, gamma-aminopropyltrimethoxysilane, N-beta- (aminoethyl) -gamma-aminopropylmethyldimethoxysilane, N-phenyl-gamma-aminopropyltriethoxysilane, N-phenyl-gamma-aminopropyltrimethoxysilane, N-beta- (aminoethyl) -gamma-aminopropyltriethoxysilane, N-6- (aminohexyl) -3-aminopropyltrimethoxysilane, 3-aminopropyltrimethylsilane, and 3-aminopropylsilane.
R in the formula (2)5The alkylene groups included may be alkylene groups containing an-NH-group.
The structure given by formula (3) is a divalent linking group having a urethane bond.
The linking group is not limited to the case of being formed by reaction. In the case where a linking group is formed by the reaction to produce the resin represented by formula (1), for example, the formation may be performed by reacting a compound having a hydroxyl group with an isocyanatosilane compound (isocyanato silane compound) (e.g., a compound containing an isocyanate group and an alkoxysilyl group, a compound containing an isocyanate group and an alkylsilyl group, and the like).
The isocyanatosilane compound is not particularly limited, but may be exemplified by 3-isocyanatopropyltrimethoxysilane, 3-isocyanatopropylmethyldimethoxysilane, 3-isocyanatopropyldimethylmethoxysilane, 3-isocyanatopropyltriethoxysilane, 3-isocyanatopropylmethyldiethoxysilane, 3-isocyanatopropyldimethylethoxysilane, and 3-isocyanatopropyltrimethylsilane.
The structures represented by formulae (4) and (5) are divalent linking groups comprising a bond of an ester bond grafted into a polymer.
These linking groups are not limited to those formed by reaction. In the case where the linking group is formed by reaction to produce the resin represented by formula (1), for example, the formation may be performed by an insertion reaction of a silane compound having an epoxy group. The insertion reaction of the silane compound having an epoxy group is as follows.
Here, the step of performing an insertion reaction of an epoxy group of the silane compound having an epoxy group into an ester bond present in the polymer main chain is included.
The insertion reactions mentioned here are reactions as described, for example, in organic Synthetic chemistry (Journal of Synthetic organic chemistry), Japan, volume 49, No. 3, page 218, 1991 "Addition reactions of Epoxy Compounds with Esters and their use in Polymer synthesis (Addition Reaction of Epoxy Compounds with Esters and ItsApplication for Polymer Syntheses)".
The following formula (a) shows the mechanism of the reaction as a simple model formula.
(in the formula (A), D and E represent constituent parts of a polymer, and F represents a constituent part other than an epoxy part of a silane compound having an epoxy group.)
Two kinds of compounds resulting from α -scission and β -scission in the opening of an epoxy group in formula (a) are possible, but both represent a manner in which an epoxy group is inserted into an ester bond in a polymer, that is, a manner in which a constituent portion other than an epoxy site of a silane compound having an epoxy group is grafted into a polymer site.
The silane compound having an epoxy group is not particularly limited, but may be exemplified by β - (3, 4-epoxycyclohexyl) ethyltrimethoxysilane, γ -glycidoxypropyltrimethoxysilane, γ -glycidoxypropylmethyldiethoxysilane, and 5, 6-epoxyhexyltrimethylsilane.
From the viewpoint of charge rising performance under a high-temperature and high-humidity environment, the resin a having an ester bond and having a substituted or unsubstituted silyl group in the molecule preferably contains a monomer unit derived from a compound having an aromatic ring as a constituent component in the resin. This is because the aromatic ring has a high electron density derived from a pi-bond, and the generation of polarization is promoted by resonance with electrons in a P orbital which an element bonded to the aromatic ring has.
Thereby, the charge rising performance is further improved because the aromatic ring can also contribute to charge transfer generated between the ester bond and the silicon atom.
The resin a preferably further contains a monomer unit derived from a trihydric or higher polyhydric alcohol or a trihydric or higher polycarboxylic acid as a constituent component.
With the use of a monomer unit derived from a trihydric or higher polyhydric alcohol or a trihydric or higher polycarboxylic acid, since a polymer chain forming the resin has a branched structure, this increases the number of terminals within each molecule, and then the amount of silicon atoms that can be introduced into a single molecule can be increased by bonding sites having substituted or unsubstituted silyl groups at the molecular terminals.
As a result, the silicon atoms in the resin a can be more uniformly distributed, and the number of ester bond/silicon atom pairs which exist in the vicinity of the toner surface and which can diffuse charges on the toner surface during charging can be increased. It is presumed that as a result, excellent charge rising performance is obtained.
The weight average molecular weight (Mw) of the resin a, or the weight average molecular weight (Mw) of the resin represented by formula (1), is preferably 3000 to 100000 and more preferably 3000 to 60000. Making the weight average molecular weight within the above range provides a toner having better storability and better low-temperature fixability.
The content of the resin a in the entire resins in the toner particles is preferably 1.0 to 100.0 mass%, and more preferably 1.0 to 10.0 mass%.
The toner particles may contain a resin other than the resin a.
The resin other than the resin a will be described (hereinafter also referred to as a binder resin; however, when the resin other than the resin a is not present in the toner particles, the resin a is a binder resin).
The binder resin is not particularly limited, and examples herein are known binder resins used in toners.
The following are examples: homopolymers of aromatic vinyl compounds such as styrene and vinyltoluene and substituted forms thereof; aromatic vinyl compound copolymers such as styrene-propylene copolymer, styrene-vinyltoluene copolymer, styrene-vinylnaphthalene copolymer, styrene-methyl acrylate copolymer, styrene-ethyl acrylate copolymer, styrene-butyl acrylate copolymer, styrene-octyl acrylate copolymer, styrene-dimethylaminoethyl acrylate copolymer, styrene-methyl methacrylate copolymer, styrene-ethyl methacrylate copolymer, styrene-butyl methacrylate copolymer, styrene-dimethylaminoethyl methacrylate copolymer, styrene-vinyl methyl ether copolymer, styrene-vinyl ethyl ether copolymer, styrene-vinyl methyl ketone copolymer, styrene-methyl acrylate copolymer, styrene-butyl acrylate copolymer, styrene-ethyl acrylate copolymer, styrene-vinyl methyl ketone copolymer, styrene-butyl acrylate copolymer, styrene-ethyl acrylate copolymer, styrene-vinyl methyl ether copolymer, styrene-vinyl methyl ketone, Styrene-butadiene copolymers, styrene-isoprene copolymers, styrene-maleic acid copolymers, and styrene-maleic acid ester copolymers; homopolymers of aliphatic vinyl compounds such as ethylene and propylene and substituted forms thereof; vinyl resins such as polyvinyl acetate, polyvinyl propionate, polyvinyl benzoate, polyvinyl butyrate, polyvinyl formate, and polyvinyl butyral; a vinyl ether resin; a vinyl ketone resin; an acrylic polymer; a methacrylic polymer; a silicone resin; a polyester resin; a polyamide resin; an epoxy resin; a phenolic resin; rosin; modifying rosin; and a terpene resin. One of these may be used alone, or a combination of plural kinds may be used.
The aromatic vinyl compound and its substituted form can be exemplified as follows:
styrene and styrene derivatives, such as styrene, alpha-methylstyrene, beta-methylstyrene, o-methylstyrene, m-methylstyrene, p-methylstyrene, 2, 4-dimethylstyrene, p-n-butylstyrene, p-tert-butylstyrene, p-n-hexylstyrene, p-n-octylstyrene, p-n-nonylstyrene, p-n-decylstyrene, p-n-dodecylstyrene, p-methoxystyrene, and p-phenylstyrene.
The polymerizable monomer used to form the acrylic polymer may be exemplified by acrylic polymerizable monomers such as acrylic acid, methyl acrylate, ethyl acrylate, n-propyl acrylate, isopropyl acrylate, n-butyl acrylate, isobutyl acrylate, t-butyl acrylate, n-pentyl acrylate, n-hexyl acrylate, 2-ethylhexyl acrylate, n-octyl acrylate, n-nonyl acrylate, cyclohexyl acrylate, benzyl acrylate, dimethylphosphate ethyl acrylate, diethylphosphate ethyl acrylate, dibutylphosphate ethyl acrylate, and 2-benzoyloxyethyl acrylate.
The polymerizable monomer used to form the methacrylic polymer may be exemplified by methacrylic polymerizable monomers such as methacrylic acid, methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, t-butyl methacrylate, n-pentyl methacrylate, n-hexyl methacrylate, 2-ethylhexyl methacrylate, n-octyl methacrylate, n-nonyl methacrylate, diethyl phosphate ethyl methacrylate, and dibutyl phosphate ethyl methacrylate.
A polycondensate between the carboxylic acid component and the alcohol component exemplified below may be used as the polyester resin. The carboxylic acid component may be exemplified by terephthalic acid, isophthalic acid, phthalic acid, fumaric acid, maleic acid, cyclohexanedicarboxylic acid, and trimellitic acid. The alcohol component may be exemplified by bisphenol a, hydrogenated bisphenol, ethylene oxide adduct of bisphenol a, propylene oxide adduct of bisphenol a, glycerin, trimethylolpropane, and pentaerythritol.
The polyester resin may be a urea group-containing polyester resin. Preferably, the carboxyl groups of the polyester resin, e.g., in the terminal positions, etc., are not end-capped.
The binder resin may have a polymerizable functional group for the purpose of improving the change in viscosity of the toner at high temperature. The polymerizable functional group may be exemplified by vinyl group, isocyanate group, epoxy group, amino group, carboxyl group, and hydroxyl group.
Among the foregoing, a styrene-acrylic copolymer represented by styrene-butyl acrylate is particularly preferable from the viewpoint of developing characteristics and fixing performance. The production method of the polymer is not particularly limited, and a known method can be used.
The toner particles may contain a wax. The wax is not particularly limited, and the following are examples: aliphatic hydrocarbon-based waxes such as low molecular weight polyethylene, low molecular weight polypropylene, microcrystalline wax, fischer-tropsch wax, and paraffin wax; oxides of aliphatic hydrocarbon waxes such as oxidized polyethylene wax, and block copolymers thereof; waxes in which the main component is a fatty acid ester, such as carnauba wax and montanate wax, and waxes provided by partial or complete deacidification of fatty acid esters, such as deacidified carnauba wax; saturated straight-chain fatty acids such as palmitic acid, stearic acid, and montanic acid; unsaturated fatty acids such as brassidic acid, eleostearic acid, and stearidonic acid; saturated alcohols such as stearyl alcohol, aralkyl alcohol, behenyl alcohol, carnauba alcohol, ceryl alcohol, and myricyl alcohol; polyols, such as sorbitol; fatty acid amides such as linoleamide, oleamide, and lauramide; saturated fatty acid bisamides such as methylene bisstearamide, ethylene bisdecanamide, ethylene bislauramide, and hexamethylene bisstearamide; unsaturated fatty acid amides such as ethylenebisoleamide, hexamethylenebisoleamide, N '-dioleyladipamide, and N, N' -dioleylsebactamide; aromatic bisamides such as m-xylylbisilamide, and N, N' -distearylmethisophthalamide; fatty acid metal salts (generally known as metal soaps) such as calcium stearate, calcium laurate, zinc stearate, and magnesium stearate; waxes provided by grafting an aliphatic hydrocarbon-based wax using a vinyl monomer such as styrene or acrylic acid; partial esters between fatty acids and polyols, such as behenic acid monoglyceride; and methyl ester compounds containing a hydroxyl group obtained by, for example, hydrogenation of vegetable oils. These waxes may be used alone, or two or more kinds may be used in combination.
The aliphatic alcohol used for the formation of the ester wax may be exemplified by 1-hexanol, 1-heptanol, 1-octanol, 1-nonanol, 1-decanol, undecanol, lauryl alcohol, myristyl alcohol, 1-hexadecanol, stearyl alcohol, arachidyl alcohol, behenyl alcohol, and lignoceryl alcohol. The aliphatic carboxylic acid may be exemplified by valeric acid, caproic acid, enanthic acid, caprylic acid, pelargonic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, arachidic acid, behenic acid, and lignoceric acid.
The content of the wax is preferably 0.5 to 20.0 parts by mass with respect to 100.0 parts by mass of the binder resin or the polymerizable monomer.
Coloring agent
The toner may include a colorant. The colorant is not particularly limited, and a known colorant may be used.
Examples of the Yellow pigment include Yellow iron oxide, and condensed azo compounds such as navel orange Yellow (Navels Yellow), naphthol Yellow S, hansa Yellow G (hansa Yellow G), hansa Yellow 10G, benzidine Yellow GR, quinoline Yellow lake, permanent Yellow NCG, and tartrazine lake, isoindolinone compounds, anthraquinone compounds, azo metal complexes, methine compounds, and allylamide compounds. Specific examples are shown below.
Pigment yellow 12, 13, 14, 15, 17, 62, 74, 83, 93, 94, 95, 109, 110, 111, 128, 129, 147, 155, 168, 180.
Examples of orange pigments are shown below.
Permanent Orange GTR, pyrazolone Orange, warken Orange (Vulcan Orange), benzidine Orange G, indanthrene bright Orange RK, and indanthrene bright Orange GK.
Examples of Red pigments include indian Red, such as permanent Red 4R, lithol Red, pyrazolone Red, malachite Red calcium salt (Watching Red calcium salt), lake Red C, lake Red D, brilliant carmine 6B, brilliant carmine 3B, eosin lake, rhodamine lake B, and condensed azo compounds such as alizarin lake, diketopyrrolopyrrole compounds, anthraquinone compounds, quinacridone compounds, basic dye lake compounds, naphthol compounds, benzimidazolone compounds, thioindigo compounds, perylene compounds. Specific examples are shown below.
C.i.
Examples of the Blue pigment include copper phthalocyanine compounds and derivatives thereof such as alkali Blue lake, victoria Blue lake, phthalocyanine Blue, metal-free phthalocyanine Blue, phthalocyanine Blue partial chloride, Fast Sky Blue (Fast Sky Blue), and indanthrene Blue BG, anthraquinone compounds, and alkali dye lake compounds, and the like. Specific examples are shown below.
C.i. pigment blue 1, 7, 15:1, 15:2, 15:3, 15:4, 60, 62, 66.
Examples of Violet pigments include fast Violet b (fast Violet b) and methyl Violet lake.
Examples of green pigments include pigment green B, malachite green lake, and finally Yellow green g (final Yellow green g). Examples of the white pigment include zinc white, titanium oxide, antimony white, and zinc sulfide.
Examples of the black pigment include carbon black, aniline black, nonmagnetic ferrite, magnetite, and those toned black by using the foregoing yellow colorant, red colorant, and blue colorant. These colorants may be used alone or in a mixture, or in the form of a solid solution.
If necessary, the colorant may be surface-treated with a substance that does not inhibit polymerization.
The amount of the colorant is preferably 1.0 part by mass to 15.0 parts by mass with respect to 100.0 parts by mass of the binder resin or the polymerizable monomer.
The toner particles may contain a charge control agent. A known charge control agent can be used as the charge control agent, and a charge control agent that provides a fast triboelectric charging speed and is capable of maintaining a definite and stable triboelectric charging amount is preferable. When the toner particles are produced by a polymerization method, a charge control agent having little polymerization inhibitory property and being substantially free of a material soluble in an aqueous medium is preferable.
The charge control agent includes a charge control agent that controls the toner to be negatively chargeable and a charge control agent that controls the toner to be positively chargeable.
The following are examples of charge control agents that control the toner to be negatively chargeable:
a monoazo metal compound; acetylacetone-metal compounds; aromatic hydroxycarboxylic acids, aromatic dicarboxylic acids, hydroxycarboxylic acids, and dicarboxylic acid-based metal compounds; aromatic hydroxycarboxylic acids, aromatic monocarboxylic acids, and aromatic polycarboxylic acids, and metal salts, anhydrides, and esters thereof; phenol derivatives such as bisphenol; a urea derivative; a metal-containing salicylic acid-based compound; a metal-containing naphthoic acid-based compound; a boron compound; a quaternary ammonium salt; calixarene; and a resin-based charge control agent.
On the other hand, the following are examples of charge control agents that control the toner to be positively charged:
nigrosine and nigrosine modified by, for example, fatty acid metal salts; a guanidine compound; an imidazole compound; quaternary ammonium salts such as tributylbenzyl-1-hydroxy-4-naphthalenesulfonic acid ammonium salt and tetrabutyltetrafluoroboric acid ammonium salt, and onium salt analogs thereof such as phosphonium salts, and lake pigments thereof; triphenylmethane dyes and lake pigments thereof (examples of laking agents are phosphotungstic acid, phosphomolybdic acid, phosphomolybdotungstic acid, tannic acid, lauric acid, gallic acid, ferricyanide, and ferrocyanide); metal salts of higher fatty acids; and a resin-based charge control agent.
These charge control agents may be used alone, or a combination of two or more kinds may be used. Among these charge control agents, metal-containing salicylic acid-based compounds are preferable, and metal-containing salicylic acid-based compounds in which the metal is aluminum or zirconium are particularly preferable.
The addition amount of the charge control agent is preferably 0.1 to 20.0 parts by mass, and more preferably 0.5 to 10.0 parts by mass with respect to 100.0 parts by mass of the binder resin.
A known means may be used for the production method of the toner particles. Examples here are a dry production method, i.e., a kneading and pulverizing method, and a wet production method, i.e., a suspension polymerization method, a dissolution suspension method, an emulsion aggregation method, and an emulsion polymerization aggregation method. The use of the wet production method is preferable from the viewpoints of sharpening the particle size distribution of the toner particles, improving the average circularity of the toner particles, and generating the core-shell structure.
For example, when toner particles are produced by a kneading pulverization method, the resin a and optionally a binder resin, wax, a colorant, a charge control agent, and other additives are sufficiently mixed using a mixer such as a henschel mixer, and a ball mill. Thereafter, melt-kneading is performed by using a heating kneader such as a heating roll, a kneader, or an extruder to disperse or dissolve various materials, and toner particles are obtained by a cooling and solidifying step, a pulverizing step, a classifying step, and an optional surface treatment step.
In the pulverizing step, a known pulverizing apparatus such as a mechanical impact type, a jet type, and the like can be used. Either of the classification step and the surface treatment step may be performed prior to the other in order. The classification step preferably uses a multistage classifier in view of production efficiency.
The production of toner particles by the suspension polymerization method as a wet production method is described below.
An example of toner particle production using the suspension polymerization method is described below, but this should not be construed as limiting the present invention.
In the suspension polymerization method, the resin a and the polymerizable monomer for forming the binder resin are dissolved or dispersed to be uniform using a dispersing machine such as a ball mill or an ultrasonic dispersing machine to obtain a polymerizable monomer composition (a preparation step of the polymerizable monomer composition).
The polymerizable monomer may be exemplified by the polymerizable monomers provided as examples of the polymerizable monomer for forming the aforementioned vinyl-based copolymer. Waxes, colorants, charge control agents, crosslinking agents, polymerization initiators, and other additives may be optionally added to the polymerizable monomer composition.
In order to control the molecular weight of the binder resin, a crosslinking agent may be optionally added during the polymerization of the polymerizable monomer. A compound having two or more polymerizable double bonds is mainly used as the crosslinking agent. Examples are aromatic divinyl compounds such as divinylbenzene, and divinylnaphthalene; carboxylic acid esters having two double bonds, such as ethylene glycol diacrylate, diethylene glycol diacrylate, triethylene glycol diacrylate, tetraethylene glycol diacrylate, neopentyl glycol diacrylate, 1, 3-butylene glycol diacrylate, 1, 4-butylene glycol diacrylate, 1, 5-pentanediol diacrylate, 1, 6-hexanediol diacrylate, diacrylates of polyethylene glycol #200, #400 and #600, dipropylene glycol diacrylate, polypropylene glycol diacrylate, polyester-type diacrylates (MANDA, Nippon Kayaku Co., Ltd.), and crosslinking agents provided by changing the acrylates in the foregoing to methacrylates; divinyl compounds such as divinylaniline, divinyl ether, divinyl sulfide, and divinyl sulfone; and compounds having three or more vinyl groups. A single one of these may be used, or a mixture of two or more may be used.
The amount of the crosslinking agent added is preferably 0.1 to 15.0 parts by mass with respect to 100 parts by mass of the polymerizable monomer.
Then, the polymerizable monomer composition is introduced into a previously prepared aqueous medium, and droplets of the polymerizable monomer composition are formed into a desired toner particle diameter using a high shear mixer or a disperser (a granulating step).
The aqueous medium in the granulating step preferably contains a dispersion stabilizer to suppress coalescence of the toner particles during the production process, control the particle diameter of the toner particles, and sharpen the particle size distribution.
Dispersion stabilizers can be generally classified into high molecules that generate repulsive force by steric hindrance, and sparingly water-soluble inorganic compounds that support dispersion stabilization by electrostatic repulsive force. The fine particles of the sparingly water-soluble inorganic compound are advantageously used because they can be dissolved by an acid or a base, because they can be easily removed by dissolution by washing with an acid or a base after polymerization.
When the dispersion stabilizer is a hardly water-soluble inorganic compound, it is preferable to use a dispersion stabilizer containing any of the following: magnesium, calcium, barium, zinc, aluminum, and phosphorus. The dispersion stabilizer more preferably contains any of the following: magnesium, calcium, aluminum, and phosphorus. Specific examples are as follows:
Magnesium phosphate, tricalcium phosphate, aluminum phosphate, zinc phosphate, magnesium carbonate, calcium carbonate, magnesium hydroxide, calcium hydroxide, aluminum hydroxide, calcium metasilicate, calcium sulfate, barium sulfate, and hydroxyapatite. When such a hardly water-soluble inorganic dispersant is used, it may be used as it is, or in order to obtain even finer particles, inorganic dispersant particles generated in an aqueous medium may be used. Using tricalcium phosphate as an example, an aqueous sodium phosphate solution may be mixed with an aqueous calcium chloride solution under high speed agitation to produce a water-insoluble calcium phosphate, thereby making the dispersion more uniform and finer.
It is also possible to use an organic compound such as polyvinyl alcohol, gelatin, methyl cellulose, methylhydroxypropyl cellulose, ethyl cellulose, the sodium salt of carboxymethyl cellulose, and starch in combination in the dispersion stabilizer. These dispersion stabilizers are preferably used in an amount of 0.1 to 20.0 parts by mass relative to 100 parts by mass of the polymerizable monomer.
In order to miniaturize these dispersion stabilizers, a surfactant may also be used in an amount of 0.1 to 10.0 parts by mass relative to 100 parts by mass of the polymerizable monomer. Specifically, commercially available nonionic, anionic, or cationic surfactants can be used. For example, the use of sodium lauryl sulfate, sodium tetradecyl sulfate, sodium pentadecyl sulfate, sodium octyl sulfate, sodium oleate, sodium laurate, potassium stearate, or calcium oleate is preferred.
After the granulating step or while performing the granulating step, the polymerizable monomer present in the polymerizable monomer composition is polymerized with preferably setting the temperature to 50 ℃ to 90 ℃ to obtain a toner particle dispersion (polymerizing step).
During the polymerization step, sufficient stirring operation is preferably performed to provide a uniform temperature distribution in the vessel. When the polymerization initiator is added, the addition may be performed using any timing and for any desired length of time. Further, for the purpose of obtaining a desired molecular weight distribution, the temperature may be raised in the latter half of the polymerization reaction, and in order to remove, for example, unreacted polymerizable monomer and by-products from the system, a part of the aqueous medium may be distilled off in the latter half of the reaction or by a distillation operation after the reaction is completed. The distillation operation is carried out at normal pressure or under reduced pressure.
The polymerization initiator used in the suspension polymerization method preferably has a half-life in the polymerization reaction of 0.5 to 30 hours. When the polymerization reaction is carried out using an addition amount of 0.5 to 20 parts by mass relative to 100 parts by mass of the polymerizable monomer, a polymer having a maximum value between 5000 and 50000 can be obtained. Oil-soluble initiators are generally used as polymerization initiators, the following being examples:
Azo compounds such as 2,2 '-azobisisobutyronitrile, 2' -azobis-2, 4-dimethylvaleronitrile, 1 '-azobis (cyclohexane-1-carbonitrile), and 2, 2' -azobis-4-methoxy-2, 4-dimethylvaleronitrile; and peroxide-based initiators such as acetyl cyclohexyl sulfonyl peroxide, diisopropyl peroxycarbonate, decanoyl peroxide, lauroyl peroxide, stearoyl peroxide, propionyl peroxide, acetyl peroxide, tert-butyl 2-ethylhexanoate peroxide, benzoyl peroxide, tert-butyl isobutyrate peroxide, cyclohexanone peroxide, methyl ethyl ketone peroxide, dicumyl peroxide, tert-butyl hydroperoxide, di-tert-butyl peroxide, tert-butyl peroxypivalate, and cumene hydroperoxide.
Water-soluble initiators may optionally be used together for the polymerization initiator, and examples thereof are as follows:
ammonium persulfate, potassium persulfate, 2 '-azobis (N, N' -dimethyleneisobutyramidine) hydrochloride, 2 '-azobis (2-amidinopropane) hydrochloride, azobis (isobutylamidine) hydrochloride,
One of these polymerization initiators may be used alone, or two or more thereof may be used in combination. In order to control the degree of polymerization of the polymerizable monomer, a chain transfer agent, a polymerization inhibitor, and the like may be added or used.
The particle diameter of the toner particles is preferably a weight average particle diameter of 3.0 μm to 10.0 μm from the viewpoint of obtaining a high-definition and high-resolution image. The weight average particle diameter of the toner particles may be measured using a pore resistance method. Measurements can be made, for example, using a "
The toner particle dispersion liquid provided by undergoing the polymerization step is transferred to a filtration step in which solid-liquid separation of the toner particles from the aqueous medium is performed.
The solid-liquid separation for obtaining toner particles from the resulting toner particle dispersion liquid may be performed using a conventional filtration method. Preferably followed by additional washing, such as by repulping or washing with wash water, to remove foreign matter that was not previously removed from the toner particle surfaces.
After sufficient washing, a toner cake is obtained by performing additional solid-liquid separation. The toner particles are then obtained by drying using a known drying means and, as necessary, separating out a particle fraction having a particle diameter other than the specific particle diameter by classification. When completed, the separated particle fraction having a particle size other than the specific particle size may be reused to improve the final yield.
The obtained toner particles may optionally be made into a toner by adding, for example, an external additive and mixing to adhere the external additive to the surface. For example, the use of external additives facilitates control such as fluidity, charging properties, and cleaning properties.
The external additive may be exemplified by inorganic oxide fine particles composed of, for example, silica fine particles, alumina fine particles, titanium oxide fine particles, and the like; inorganic stearic acid compound fine particles, for example, aluminum stearate fine particles, zinc stearate fine particles, and the like; and inorganic titanic acid compound fine particles such as strontium titanate, zinc titanate, and the like.
For example, any of the following may be used as the silica fine particles: dry silica fine particles, also known as dry silica, produced by the vapor phase oxidation of silicon halides, and so-called wet silica fine particles produced from, for example, water glass.
In addition, in the case of dry silica fine particles, composite fine particles of silica and other metal oxides can also be obtained by using other metal halides (for example, aluminum chloride, titanium chloride, and the like) in combination with a silicon halide compound in the production step.
These inorganic fine particles are preferably surface-treated with, for example, a silane coupling agent, a titanium coupling agent, a higher fatty acid, a silicone oil, a silicone varnish, or various modified silicone varnishes. The surface treatment agent may be used alone, or two or more kinds may be used in combination. The surface treatment supports adjustment of the charge amount of the toner, improvement of heat-resistant storage property, and improvement of environmental stability. The BET specific surface area of the external additive is preferably 10m2G to 450m2/g。
The BET specific surface area can be determined according to the BET method (preferably BET multipoint method) using a low-temperature gas adsorption method based on a dynamic constant pressure method. For example, using a specific surface area analyzer (product name: Gemini 2375Ver.5.0, Shimadzu corporation), it is possible to adsorb nitrogen gas to the surface of a sample and make it possible to carry out the adsorptionBET specific surface area (m) was calculated by measurement using the BET multipoint method2/g)。
The content of the external additive in the toner is preferably 0.05 to 10.00 parts by mass, and more preferably 0.1 to 5.0 parts by mass, relative to 100 parts by mass of the toner particles. One kind of external additive may be used alone, or two or more kinds may be used in combination. A known method can be used for mixing the external additive. For example, the mixing may be performed using a henschel mixer.
The toner may be used as a magnetic or non-magnetic one-component developer, but it may also be mixed with a carrier and used as a two-component developer.
As the carrier, magnetic particles including, for example, conventionally known materials such as metals such as iron, ferrite, magnetite, and alloys of these metals with metals such as aluminum and lead can be used. Among them, ferrite particles are preferable. Further, a coated carrier obtained by coating the surface of the magnetic particles with a coating agent such as a resin, a resin dispersion type carrier obtained by dispersing magnetic fine powder in a resin or the like can be used as the carrier.
The volume average particle diameter of the carrier is preferably 15 μm to 100 μm, and more preferably 25 μm to 80 μm.
The following describes a method for measuring properties with respect to the toner.
< method of extracting resin A from toner particles >
The extraction of the resin a in the toner particles is performed by separating an extract obtained using Tetrahydrofuran (THF) by a solvent gradient elution method. The preparation method is given below.
10.0g of toner particles were weighed out and introduced into a cylindrical filter paper (extraction thickness) (No.84, Toyo Rosha Kaisha, Ltd.), and placed in a Soxhlet extractor. Extraction was performed using 200mL of THF as a solvent for 20 hours, and then the solvent was removed from the extract to obtain a solid as a THF-soluble substance. Resin a is contained in a THF soluble material. This procedure was carried out several times to obtain the required amount of THF soluble material.
Making the gradient intoPreparative HPLC (LC-20AP high performance gradient preparative system, Shimadzu Corporation;SunFere preparative columns, Waters Corporation) were used for the solvent gradient elution method. The following were used: the column temperature was 30 ℃, the flow rate was 50 mL/min, acetonitrile was the poor solvent in the mobile phase, and THF was the good solvent. 0.02g of the THF-soluble substance obtained by the extraction was dissolved in 1.5mL of THF, and this was used as a sample for separation. A composition with 100% acetonitrile was used for the starting mobile phase; then, when 5 minutes passed after the sample injection, the THF ratio increased by 4% per minute; and the mobile phase composition at 25 minutes was 100% THF. The components may be separated by drying the obtained fraction to solidification. Thereby resin a can be obtained. Can be measured by the atomic silicon content as described below and13C-NMR measurements were made to determine which fraction of the component was resin A.
< method for measuring silicon atom content in resin A >
An "Axios" wavelength dispersive x-ray fluorescence analyzer (PANalytical b.v.) was used for the silicon atom content in resin a. The accompanying "SuperQ ver.4.0 f" (PANalytical b.v.) software was used to set the measurement conditions and analyze the measurement data.
Rh was used for the x-ray tube anode and 24kV and 100mA were used for the acceleration voltage and current, respectively.
Vacuum was used to measure the atmosphere; 27mm was used for measuring the diameter (collimator diameter); 10 seconds were used for the measurement time. A Proportional Counter (PC) is used for the detector. The measurement was performed using PET analysis crystals; measuring a count rate (unit: cps) of Si — K α rays observed at a diffraction angle (2 θ) ═ 109.08 °; and determined using a calibration curve as described below.
The resin a (or the resin having the formula (1)) may be used as it is as a measurement sample, or a resin extracted from toner particles using the aforementioned extraction method may be used as a measurement sample.
A "BRE-32" tablet forming Machine (Maekawa Testing Machine mfg. co., Ltd.) was used to obtain pellets for measurement. 4g of the measurement sample was introduced into a special aluminum press ring and pressed flat (smooth over), and pellets were produced by forming into a thickness of 2mm and a diameter of 39mm by pressing at 20MPa for 60 minutes, and the pellets were used as pellets for measurement.
For the pellets used for making the correction curve for determining the content, the content of the binder [ product name: spectro Blend, composition: c81.0, O2.9, H13.5, N2.6 (mass%), formula: c 19H38ON, form: powder (44 μm) from Rigaku Corporation]SiO is added in an amount of 0.5 part by mass2(hydrophobic fumed silica) [ product name: AEROSIL NAX50, specific surface area: 40 +/-10 (m)2Per g), carbon content: 0.45 to 0.85% from Nippon Aerosil co.](ii) a Mixing thoroughly in a coffee mill; and preparing the pellets by pellet forming. SiO was used in an amount of 5.0 parts by mass and 10.0 parts by mass, respectively2The same mixing and pellet forming processes are used to prepare the pellets.
The correction curves in the form of linear functions were obtained by placing the obtained x-ray count rates on the vertical axis and placing each correction curve on the horizontal axis with the Si addition concentration in the sample.
The same procedure was then used to also measure the count rate of Si-ka radiation for the measurement sample. The silicon atom content (% by mass) was determined from the prepared calibration curve.
< identification of Structure of resin having formula (1) >
Use of1H-NMR analysis,13C-NMR analysis,29Si-NMR analysis and FT-IR analysis to identify the Polymer site P in the resin represented by the formula (1)1、L1A site, and R1To R3And (4) the part. The resin a (or the resin having the formula (1)) may be used as it is as a measurement sample, or a resin extracted from toner particles using the above-described extraction method may be used as a measurement sample.
When L is1When an amide bond represented by the formula (2) is contained, the compound can be used1H-NMR analysis for identification. Specifically, the chemical shift value of the proton in the NH site in the amide group can be usedThe line qualification and the amount of amide groups can be determined by calculation of the integral value.
In addition, R in the resin represented by the formula (1)1To R3When an alkoxy group or a hydroxyl group is contained, the following can be mentioned "29The method described in "measurement conditions for Si-NMR (solid state)" to determine the valence of an alkoxy group or a hydroxyl group with respect to a silicon atom.
(29Measurement conditions of Si-NMR (solid State)
The instrument comprises the following steps: JNM-ECX500II, JEOL Resonance, Inc.
Sample tube:
sample amount: 150mg of
Measuring the temperature: at room temperature
Pulse mode: CP/MAS
Measuring the nuclear frequency: 97.38 MHz: (29Si)
Reference substance: DSS (external standard: 1.534ppm)
Sample rotation rate: 10kHz
Contact time: 10ms
Delay time: 2s
The scanning times are as follows: 2000 to 8000
This measurement makes it possible to obtain the presence ratio by peak separation/integration by curve fitting of the multi-silane component depending on the number of oxygen atoms bonded to Si. Proceeding in this manner makes it possible to confirm R in the resin represented by formula (1)1To R3The valence of the alkoxy group or the hydroxyl group with respect to the silicon atom.
Can pass through13C-NMR (solid-state) measurement to confirm P in the resin represented by the formula (1)1、L1And R1To R3The structure of (1). The measurement conditions were as follows.
(13Measurement conditions for C-NMR (solid State)
The instrument comprises the following steps: JNM-ECX500II, JEOL Resonance, Inc.
Sample tube:
sample amount: 150mg of
Measuring the temperature: at room temperature
Pulse mode: CP/MAS
Measuring the nuclear frequency: 123.25 MHz: (13C)
Reference substance: adamantane (external standard: 29.5ppm)
Sample rotation rate: 20kHz
Contact time: 2ms
Delay time: 2s
The scanning times are as follows: 1024
According to P in formula (1)1、L1And R1To R3Is separated into various peaks and identified separately to determine P1、L1And R1To R3The kind of (2).
< method for calculating ester bond content >
Use of13C-NMR the ester bond content in resin A was calculated as follows. The measurement conditions were as follows. The resin a (or the resin having the formula (1)) may be used as it is as a measurement sample, or a resin extracted from toner particles using the aforementioned extraction method may be used as a measurement sample.
The instrument comprises the following steps: AVANCE-600FT-NMR, Bruker Corporation
Sample amount: 150mg of
Measuring the temperature: at room temperature
The measuring method comprises the following steps: inversion gating decoupling
Solvent: 0.75ml deuterated chloroform
Relaxation reagent: acetylacetone chromium (III)
The scanning times are as follows: 30000
Quantification was performed by the internal standard method using the peak area arising at 160.0 to 170.0ppm from the ester bond.
< method for measuring number average molecular weight (Mn) and weight average molecular weight (Mw) >
The weight average molecular weight (Mw) and number average molecular weight (Mn) of the polymer, resin or toner particles were measured using Gel Permeation Chromatography (GPC) as follows.
First, the sample was dissolved in Tetrahydrofuran (THF) at room temperature for 24 hours. The obtained solution was filtered using a "sample pretreatment cartridge" (Tosoh Corporation) solvent-resistant membrane filter having a pore size of 0.2 μm to obtain a sample solution. The sample solution was adjusted to a concentration of the THF soluble component of about 0.8 mass%. The measurement was performed under the following conditions using the sample solution.
The instrument comprises the following steps: HLC8120 GPC (detector: RI) (Tosoh Corporation)
Column: shodex KF-801, 802, 803, 804, 805, 806, and 807 7 pillars (Showa Denko Kabushiki Kaisha)
Eluent: tetrahydrofuran (THF)
Flow rate: 1.0 mL/min
Oven temperature: 40.0 deg.C
Sample injection amount: 0.10mL
A molecular weight calibration curve prepared using polystyrene resin standards (product names "TSK Standard polystyrenes F-850, F-450, F-288, F-128, F-80, F-40, F-20, F-10, F-4, F-2, F-1, A-5000, A-2500, A-1000, A-500", Tosohcorporation) was used to determine the molecular weight of the sample.
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