阅读说明：本技术 环状烯烃树脂组合物 (Cyclic olefin resin composition ) 是由 国本荣起 于 2018-07-09 设计创作，主要内容包括：本发明的课题在于,提供：能制造耐热性、耐光性、和耐湿热性均良好的成型品的树脂组合物。本发明提供一种树脂组合物,其为包含环状烯烃系树脂的树脂组合物,包含：具有规定基团的化合物(A)；具有规定基团的化合物(B)；紫外线吸收剂；缩合磷酸酯；和,主链中包含苯乙烯的嵌段共聚物,对于前述环状烯烃系树脂,以依据ISO75-1,2的方法,对不实施退火处理的试验片测得的1.8MPa下的载荷挠曲温度为125℃以上,前述化合物(A)和前述化合物(B)的含量满足：相对于前述环状烯烃系树脂100质量份的前述化合物(A)的质量份≤相对于前述环状烯烃系树脂100质量份的前述化合物(B)的质量份。(The present invention addresses the problem of providing: a resin composition which can give a molded article having excellent heat resistance, light resistance and moist heat resistance. The present invention provides a resin composition containing a cycloolefin resin, including: a compound (A) having a prescribed group; a compound (B) having a prescribed group; an ultraviolet absorber; condensed phosphoric acid ester; and a block copolymer comprising styrene in the main chain, wherein the cycloolefin-based resin has a deflection temperature under load of 125 ℃ or higher at 1.8MPa as measured by a method according to ISO75-1, 2 on a test piece which is not subjected to annealing treatment, and the contents of the compound (A) and the compound (B) satisfy: the mass part of the compound (A) per 100 parts by mass of the cycloolefin-based resin is not more than the mass part of the compound (B) per 100 parts by mass of the cycloolefin-based resin.)

1. A resin composition comprising:

a cycloolefin resin;

a compound (A) having a 3, 5-di-tert-butyl-4-hydroxyphenyl group;

a compound (B) having 2,2,6, 6-tetramethyl-4-piperidyl or 1,2,2,6, 6-pentamethyl-4-piperidyl;

an ultraviolet absorber;

condensed phosphoric acid ester; and the combination of (a) and (b),

a block copolymer comprising styrene in the main chain,

the cycloolefin resin has a deflection temperature under load of 125 ℃ or higher at 1.8MPa as measured by a method in accordance with ISO75-1, 2 for a test piece that has not been subjected to annealing treatment,

the content of the compound (A) and the compound (B) satisfies: the mass part of the compound (A) per 100 parts by mass of the cycloolefin-based resin is not more than 100 parts by mass of the compound (B) per 100 parts by mass of the cycloolefin-based resin.

2. The resin composition according to claim 1, wherein the ultraviolet absorber and the compound (B) are contained in amounts satisfying: the amount of the ultraviolet absorber is not more than 100 parts by mass of the cycloolefin-based resin and is not more than 100 parts by mass of the compound (B) per 100 parts by mass of the cycloolefin-based resin.

3. The resin composition according to claim 1 or 2, wherein the cyclic olefin-based resin comprises an addition copolymer of norbornene and ethylene.

4. The resin composition according to any one of claims 1 to 3, wherein the compound (A) comprises pentaerythritol tetrakis [3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ].

5. The resin composition according to any one of claims 1 to 4, wherein the compound (B) comprises a compound selected from the group consisting of fatty acids (unsaturated C12-21 and C18) 2,2,6, 6-tetramethyl-4-piperidyl ester, bis (2,2,6, 6-tetramethyl-4-piperidyl) sebacate, poly [ { 6-morpholinyl-1, 3, 5-triazine-2, 4-diyl } { (1,2,2,6, 6-pentamethyl-4-piperidyl) imino } hexamethylene { (1,2,2,6, 6-pentamethyl-4-piperidyl) imino } ], and poly [ {6- (1,1,3, 3-tetramethylbutyl) amino-1, 3, 5-triazine-2, 4-diyl } { (2,2,6, 6-tetramethyl-4-piperidyl) imino } hexamethylene { (2,2,6, 6-tetramethyl-4-piperidyl) imino } ], and a compound represented by the following formula (1),

6. the resin composition according to any one of claims 1 to 5, wherein the ultraviolet absorber comprises a compound selected from the group consisting of 2- (2H-benzotriazol-2-yl) -4-6-bis (1-methyl-1-phenylmethyl) phenol, 2' -methylenebis [6- (2H-benzotriazol-2-yl) -4- (1,1,3, 3-tetramethylbutyl) phenol ], 2- [4, 6-bis (2, 4-dimethylphenyl) -1,3, 5-triazin-2-yl ] -5- (octyloxy) phenol, bis {2- [4- (4, 6-diphenyl-1, 3, 5-triazin-2-yl) -3-hydroxyphenoxy ] ethyl } dodecanedioate, And 2,2- (1, 4-xylylene) tetraethyl diacrylate.

7. The resin composition according to any one of claims 1 to 6, wherein the condensed phosphoric ester comprises 1,3 phenylene bis (di-2, 6 xylyl phosphate).

8. The resin composition according to any one of claims 1 to 7, wherein the block copolymer is as follows: the styrene-based polymer composition has a styrene content of 45 to 70 mass% and contains a hydrogenated product of a block copolymer of styrene and butadiene and/or isoprene.

Technical Field

The present invention relates to a cyclic olefin resin composition.

Background

The cycloolefin resin is a resin having a skeleton of a cycloolefin in its main chain, and has various characteristics such as high transparency, high heat distortion temperature, low birefringence, and hydrolysis resistance. Therefore, cycloolefin resins are used in various fields requiring these characteristics.

In particular, cycloolefin resins are used as materials for optical devices such as lenses, light guide plates, diffraction gratings, and the like, because they exhibit high heat resistance, high transparency, and low birefringence. For example, patent document 1 discloses the following: the cycloolefin resin containing the specific repeating unit at a predetermined ratio can be used as a raw material for an optical lens or the like.

Disclosure of Invention

Problems to be solved by the invention

However, there is a demand for a cycloolefin resin-containing composition that can provide a molded article having good heat resistance, light resistance, and moist heat resistance, and being less likely to cause yellowing, cracking, and the like, with a higher balance.

The present invention has been made to solve the above problems, and an object of the present invention is to provide: a resin composition which can give a molded article having excellent heat resistance, light resistance and moist heat resistance.

Means for solving the problems

The present inventors have made extensive studies to solve the above problems. As a result, they found that: the above problems can be solved by a composition comprising a cycloolefin resin having a predetermined deflection temperature under load and a specific component, and the present invention has been completed. More specifically, the present invention provides the following.

(1) A resin composition comprising:

a cycloolefin resin;

a compound (A) having a 3, 5-di-tert-butyl-4-hydroxyphenyl group;

a compound (B) having 2,2,6, 6-tetramethyl-4-piperidyl or 1,2,2,6, 6-pentamethyl-4-piperidyl;

an ultraviolet absorber;

condensed phosphoric acid ester; and the combination of (a) and (b),

a block copolymer comprising styrene in the main chain,

the cycloolefin resin has a deflection temperature under load of 125 ℃ or higher at 1.8MPa as measured by a method in accordance with ISO75-1, 2 for a test piece which is not subjected to annealing treatment,

the content of the aforementioned compound (a) and the aforementioned compound (B) satisfies: the mass part of the compound (A) per 100 parts by mass of the cycloolefin-based resin is not more than the mass part of the compound (B) per 100 parts by mass of the cycloolefin-based resin.

(2) The resin composition according to (1), wherein the content of the ultraviolet absorber and the compound (B) satisfies: the amount of the ultraviolet absorber is not more than 100 parts by mass of the cycloolefin-based resin and is not more than 100 parts by mass of the compound (B) per 100 parts by mass of the cycloolefin-based resin.

(3) The resin composition according to (1) or (2), wherein the cycloolefin-based resin contains an addition copolymer of norbornene and ethylene.

(4) The resin composition according to any one of (1) to (3), wherein the compound (A) comprises pentaerythritol tetrakis [3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ].

(5) The resin composition according to any one of (1) to (4), wherein the aforementioned compound (B) comprises a compound selected from the group consisting of 2,2,6, 6-tetramethyl-4-piperidyl ester, bis (2,2,6, 6-tetramethyl-4-piperidyl) sebacate, poly [ { 6-morpholinyl-1, 3, 5-triazine-2, 4-diyl } { (1,2,2,6, 6-pentamethyl-4-piperidyl) imino } hexamethylene { (1,2,2,6, 6-pentamethyl-4-piperidyl) imino } ], and poly [ {6- (1,1,3, 3-tetramethylbutyl) amino-1, 3, 5-triazine-2, 4-diyl } { (2,2,6, 6-tetramethyl-4-piperidyl) imino } hexamethylene { (2,2,6, 6-tetramethyl-4-piperidyl) imino } ], and a compound represented by the following formula (1).

(6) The resin composition according to any one of (1) to (5), wherein the ultraviolet absorber comprises a compound selected from the group consisting of 2- (2H-benzotriazol-2-yl) -4-6-bis (1-methyl-1-phenylmethyl) phenol, 2' -methylenebis [6- (2H-benzotriazol-2-yl) -4- (1,1,3, 3-tetramethylbutyl) phenol ], 2- [4, 6-bis (2, 4-dimethylphenyl) -1,3, 5-triazin-2-yl ] -5- (octyloxy) phenol, bis {2- [4- (4, 6-diphenyl-1, 3, 5-triazin-2-yl) -3-hydroxyphenoxy ] ethyl } dodecanedioate, And 2,2- (1, 4-xylylene) tetraethyl diacrylate.

(7) The resin composition according to any one of (1) to (6), wherein the condensed phosphoric ester contains 1, 3-phenylene bis (di-2, 6-xylyl phosphate).

(8) The resin composition according to any one of (1) to (7), wherein the block copolymer is as follows: the styrene-based polymer composition has a styrene content of 45 to 70 mass% and contains a hydrogenated product of a block copolymer of styrene and butadiene and/or isoprene.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, there can be provided: a resin composition which can give a molded article having excellent heat resistance, light resistance and moist heat resistance.

Detailed Description

Hereinafter, embodiments of the present invention will be described. The present invention is not limited to the following embodiments.

< resin composition >

The resin composition of the present invention is a resin composition comprising a cycloolefin resin, a compound (A) having a 3, 5-di-t-butyl-4-hydroxyphenyl group, a compound (B) having a 2,2,6, 6-tetramethyl-4-piperidyl group or a 1,2,2,6, 6-pentamethyl-4-piperidyl group, an ultraviolet absorber, a condensed phosphate ester, and a block copolymer containing styrene in the main chain, wherein the cycloolefin resin has a deflection temperature under load of 125 ℃ or more at 1.8MPa as measured by a method according to ISO75-1, 2 with respect to a test piece which is not subjected to an annealing treatment. The structure of the resin composition of the present invention will be described below.

(cycloolefin resin)

The cycloolefin resin in the present invention is not particularly limited as long as it is a polymer or copolymer having a main chain containing a structural unit derived from a cycloolefin, and the deflection temperature under load at 1.8MPa (hereinafter, also referred to as "deflection temperature under load of cycloolefin resin") measured by a method according to ISO75-1, 2 on a test piece without annealing treatment is 125 ℃. When the deflection temperature under load of the cycloolefin resin contained in the resin composition is 125 ℃ or more, sufficient heat resistance and moist heat resistance can be imparted to a molded article obtained from the resin composition. The lower limit of the deflection temperature under load of the cycloolefin resin is preferably 125 ℃ or more from the viewpoint of easily suppressing yellowing of a molded article obtained from the resin composition. The upper limit of the deflection temperature under load of the cycloolefin resin is preferably 170 ℃ or lower, and more preferably 165 ℃ or lower. In the case where 2 or more kinds of cycloolefin resins are used in combination in the present invention, the deflection temperature under load is the deflection temperature under load of a resin mixture in which all of the cycloolefin resins are mixed.

The cycloolefin resin having the deflection temperature under load can be produced by, for example, adjusting the ratio of monomers (for example, norbornene, ethylene, and the like) constituting the cycloolefin resin, or blending cycloolefin resins having different glass transition points.

Examples of the polymer or copolymer having a main chain containing a structural unit derived from a cyclic olefin include: addition polymers of cyclic olefins or hydrogenated products thereof, addition copolymers of cyclic olefins and α -olefins or hydrogenated products thereof, and the like. The cycloolefin resin may be used alone in 1 kind, or may be used in combination in2 or more kinds.

In addition, as the cycloolefin-based resin, there can be mentioned: a resin having an unsaturated compound having a polar group further grafted and/or copolymerized on the above-mentioned polymer or the above-mentioned copolymer containing a structural unit derived from a cyclic olefin in the main chain.

Examples of the polar group include a carboxyl group, an acid anhydride group, an epoxy group, an amide group, an ester group, a hydroxyl group, and examples of the unsaturated compound having a polar group include (meth) acrylic acid, maleic anhydride, itaconic anhydride, glycidyl (meth) acrylate, alkyl (1 to 10 carbon) methacrylate, alkyl (1 to 10 carbon) maleate, meth) acrylamide, and 2-hydroxyethyl (meth) acrylate.

Further, as the above-mentioned copolymer used as the cycloolefin resin in the present invention, a commercially available resin may be used. Examples of commercially available cycloolefin resins include TOPAS (registered trademark) (manufactured by TOPAS Advanced polymers inc.), Apel (registered trademark) (manufactured by mitsui chemical CORPORATION), Zeonex (registered trademark) (manufactured by ZEON CORPORATION), Zeonor (registered trademark) (manufactured by ZEON CORPORATION), Arton (registered trademark) (manufactured by JSR CORPORATION), and the like.

A particularly preferred example of the addition copolymer of a cyclic olefin and an alpha-olefin is a copolymer comprising [ 1] a structural unit derived from an alpha-olefin having 2 to 20 carbon atoms and [ 2] a structural unit derived from a cyclic olefin represented by the following general formula (I).

(in the formula, R¹～R¹²Optionally the same or different, are selected from the group consisting of a hydrogen atom, a halogen atom, and a hydrocarbon group,

R⁹and R¹⁰、R¹¹And R¹²Optionally integrated to form a 2-valent hydrocarbon radical,

R⁹or R¹⁰Heel R¹¹Or R¹²Optionally forming a ring with each other.

In addition, n represents 0 or a positive integer,

when n is 2 or more, R⁵～R⁸Optionally, each of the repeating units may be the same or different. )

[ (1) C2-20. alpha. -olefin ]

The alpha-olefin having 2 to 20 carbon atoms is not particularly limited. For example, the same can be cited as in Japanese patent laid-open No. 2007-302722. These α -olefins may be used alone in 1 kind or in combination of 2 or more kinds. Among these, the use of ethylene alone is most preferable.

[ (2) Cyclic olefin of the formula (I)

A cyclic olefin represented by the general formula (I) will be described. R in the general formula (I)¹～R¹²Optionally, each of the same or different, is selected from the group consisting of a hydrogen atom, a halogen atom, and a hydrocarbon group. Specific examples of the cyclic olefin represented by the general formula (I) include those similar to Japanese patent laid-open publication No. 2007-302722.

These cyclic olefins may be used alone in 1 kind, or may be used in combination with 2 or more kinds. Among them, bicyclo [2.2.1] hept-2-ene (common name: norbornene) alone is preferably used.

The method for polymerizing [ 1] an α -olefin having 2 to 20 carbon atoms and [ 2] a cyclic olefin represented by the general formula (I) and the method for hydrogenating the resulting polymer are not particularly limited and can be carried out according to known methods.

The polymerization catalyst used is not particularly limited, and a conventionally known catalyst such as a ziegler-natta catalyst, a double decomposition catalyst, or a metallocene catalyst can be used to obtain the cycloolefin resin by a known method.

The method for hydrogenating the obtained cycloolefin resin is not particularly limited, and conventionally known methods can be applied.

The cycloolefin resin may contain, in addition to the [ 1] α -olefin component having 2 to 20 carbon atoms and the [ 2] cyclic olefin component represented by the general formula (I), other copolymerizable unsaturated monomer components as required within a range not to impair the object of the present invention. The unsaturated monomer optionally copolymerized is not particularly limited, and examples thereof include hydrocarbon monomers having 2 or more carbon-carbon double bonds in 1 molecule. Specific examples of the hydrocarbon-based monomer having 2 or more carbon-carbon double bonds in 1 molecule include those similar to those described in Japanese patent laid-open publication No. 2007-302722.

Among the above, as the cycloolefin-based resin in the present invention, an addition copolymer of norbornene and ethylene is particularly preferable from the viewpoint of particularly easily exhibiting the effects of the present invention.

The lower limit of the glass transition point of the cycloolefin resin is not particularly limited, but is preferably 130 ℃ or higher, more preferably 145 ℃ or higher. When the glass transition point of the cycloolefin resin is in the above range, heat resistance can be easily imparted to a molded article obtained from the resin composition. The upper limit of the glass transition point of the cycloolefin resin is not particularly limited, but is preferably 190 ℃ or lower, and more preferably 185 ℃ or lower. When the glass transition point of the cycloolefin resin is in the above range, yellowing of a molded article obtained from the resin composition is easily suppressed.

The glass transition point (Tg) of the cycloolefin resin was measured by DSC (method described in ISO11357-1, -2, -3) at a temperature increase rate of 20 ℃/min.

The lower limit of the content of the cycloolefin resin is not particularly limited, but is preferably 65.0% by mass or more, and more preferably 95.0% by mass or more in the resin composition. The upper limit of the content of the cycloolefin resin is not particularly limited, and is preferably 98.0% by mass or less in the resin composition.

(Compound (A) and Compound (B))

The compound (a) (hereinafter, also referred to as "compound (a)") having a 3, 5-di-tert-butyl-4-hydroxyphenyl group and the compound (B) (hereinafter, also referred to as "compound (B)") having a 2,2,6, 6-tetramethyl-4-piperidyl group or a 1,2,2,6, 6-pentamethyl-4-piperidyl group are blended with an ultraviolet absorber described later in a composition containing a cycloolefin resin, whereby heat resistance, light resistance, and moist heat resistance can be imparted to a molded article obtained from the resin composition in a well-balanced manner.

Further, as a result of the studies by the present inventors, it was found that: by blending the contents of the compound (a) and the compound (B) so as to satisfy the following relational expression 1, that is, by making the content of the compound (a) equal to the content of the compound (B) or making the content of the compound (B) larger than the content of the compound (a), a molded article obtained from the resin composition can be provided with particularly well-balanced heat resistance, light resistance, and moist heat resistance.

The mass part of the compound (A) per 100 parts by mass of the cycloolefin-based resin is not more than the mass part of the compound (B) per 100 parts by mass of the cycloolefin-based resin, and the relational expression 1

The content of the compound (a) and the compound (B) is not particularly limited as long as the above-mentioned relational formula 1 is satisfied, and the content of the compound (B) may be preferably 1 time or more, more preferably 2 times or more, and further preferably 3 times or more with respect to the content of the compound (a). The content of the compound (B) may be preferably 5 times or less, more preferably 3 times or less, based on the content of the compound (a).

The compound (a) may be a hindered phenol (a compound containing a t-butyl group at both ortho-positions with respect to the phenolic hydroxyl group). The results of the studies of the present inventors found that: even when mono-hindered phenol (a compound containing a t-butyl group only on one side of both ortho-positions relative to the phenolic hydroxyl group) is used instead of hindered phenol, heat resistance and light resistance cannot be sufficiently imparted to a molded article obtained from the resin composition.

The compound (a) is not particularly limited as long as it is a compound having a 3, 5-di-tert-butyl-4-hydroxyphenyl group, and examples thereof include monocyclic compounds (e.g., 2, 6-di-tert-butyl-p-cresol), polycyclic compounds in which hydrocarbon groups or groups containing sulfur atoms are bonded (e.g., 4 '-methylenebis (2, 6-di-tert-butylphenol), 1,3, 5-trimethyl-2, 4, 6-tris (3, 5-di-tert-butyl-4-hydroxybenzyl) benzene, etc.), compounds having an ester group or an amide group (e.g., n-octadecyl-3- (4' -hydroxy-3 ', 5' -di-tert-butylphenyl) propionate, n-octadecyl-2- (4 '-hydroxy-3', 5 ' -di-tert-butylphenyl) propionate, 1, 6-hexanediol-bis [3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ], pentaerythritol tetrakis [3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ], 2- [1- (2-hydroxy-3, 5-di-tert-pentylphenyl) ethyl ] -4, 6-di-tert-pentylphenyl acrylate, di-N-octadecyl-3, 5-di-tert-butyl-4-hydroxybenzylphosphonate, N ' -hexamethylenebis (3, 5-di-tert-butyl-4-hydroxy-dihydrocinnamamide), N ' -ethylenebis [3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionamide ], n, N ' -tetramethylenebis [3- (3, 5-di-t-butyl-4-hydroxyphenyl) propionamide ], N ' -hexamethylenebis [3- (3, 5-di-t-butyl-4-hydroxyphenyl) propionamide ], N ' -bis [3- (3, 5-di-t-butyl-4-hydroxyphenyl) propionyl ] hydrazine, 1,3, 5-tris (3, 5-di-t-butyl-4-hydroxybenzyl) isocyanurate, etc.). The compound (a) may be used alone in 1 kind, or may be used in combination in2 or more kinds.

Among the above, pentaerythritol tetrakis [3- (3, 5-di-t-butyl-4-hydroxyphenyl) propionate ] is particularly preferable from the viewpoint of exerting the effect of the present invention.

The compound (B) is not particularly limited as long as it has a 2,2,6, 6-tetramethyl-4-piperidyl group or a 1,2,2,6, 6-pentamethyl-4-piperidyl group. The compound (B) may be used alone in 1 kind, or may be used in combination in2 or more kinds.

Examples of the compound having a 2,2,6, 6-tetramethyl-4-piperidyl group include: 2,2,6, 6-tetramethyl-4-piperidine stearin, fatty acids (unsaturated at C12-21 and C18) 2,2,6, 6-tetramethyl-4-piperidine ester, poly [ { 6-morpholinyl-1, 3, 5-triazine-2, 4-diyl } { (2,2,6, 6-tetramethyl-4-piperidinyl) imino } hexamethylene { (2,2,6, 6-tetramethyl-4-piperidinyl) imino } ], bis (2,2 ', 6, 6' -tetramethyl-4-piperidinyl) sebacate, dimethyl succinate-1- (2-hydroxyethyl) -4-hydroxy-2, 2,6, 6-tetramethylpiperidine polycondensate, poly [ {6- (1,1,3, 3-tetramethylbutyl) amino-1, 3, 5-triazine-2, 4-diyl } { (2,2,6, 6-tetramethyl-4-piperidyl) imino } hexamethylene } { (2,2,6, 6-tetramethyl-4-piperidyl) imino } ], tetrakis (2,2,6, 6-tetramethyl-4-piperidyl) -1,2,3, 4-butane tetracarboxylic acid ester, 2,6, 6-tetramethyl-4-piperidyl benzoate, 1' - (1, 2-ethanediyl) bis (3,3,5, 5-tetramethylpiperazinone), (mixed 2,2,6, 6-tetramethyl-4-piperidyl/tridecyl) -1,2,3, 4-butanetetracarboxylate, mixed {2,2,6, 6-tetramethyl-4-piperidyl/. beta.,. beta. '-tetramethyl-3, 9- [2,4,8, 10-tetraoxaspiro (5,5) undecane ] diethyl } -1,2,3, 4-butanetetracarboxylate, poly [ 6-N-morpholinyl-1, 3, 5-triazine-2, 4-diyl ] [ (2,2,6, 6-tetramethyl-4-piperidyl) imino ] hexamethylene [ (2,2,6, 6-tetramethyl-4-piperidyl) imide ], N' -bis (2,2,6, 6-tetramethyl-4-piperidyl) hexamethylenediamine with 1, a condensate of 2-dibromoethane, [ N- (2,2,6, 6-tetramethyl-4-piperidyl) -2-methyl-2- (2,2,6, 6-tetramethyl-4-piperidyl) imino ] propionamide, and a compound represented by the following formula (1).

Examples of the compound having a 1,2,2,6, 6-pentamethyl-4-piperidyl group include [ { 4-methoxyphenyl } methylene ] -bis (1,2,2,6, 6-pentamethyl-4-piperidyl) malonate, bis- (1,2,6, 6-pentamethyl-4-piperidyl) -2- (3, 5-di-t-butyl-4-hydroxybenzyl) -2-N-butylmalonate, bis (1,2,2,6, 6-pentamethyl-4-piperidyl) { [3, 5-bis (1, 1-dimethylethyl) -4-hydroxyphenyl ] methyl } butylmalonate, bis- (N-methyl-2, 2,6, 6-tetramethyl-4-piperidyl) sebacate, Poly [ { 6-morpholinyl-1, 3, 5-triazine-2, 4-diyl } { (1,2,2,6, 6-pentamethyl-4-piperidinyl) imino } hexamethylene { (1,2,2,6, 6-pentamethyl-4-piperidinyl) imino } ] (mixed 1,2,2,6, 6-pentamethyl-4-piperidinyl/tridecyl) -1,2,3, 4-butanetetracarboxylate, mixed {1,2,2,6, 6-pentamethyl-4-piperidinyl/β, β, β ', β' -tetramethyl-3, 9- [2,4,8, 10-tetraoxaspiro (5,5) undecane ] diethyl } -1,2,3, 4-butanetetracarboxylate, N, N' -bis (3-aminopropyl) ethylenediamine-2, 4-bis [ N-butyl-N- (1,2,2,6, 6-pentamethyl-4-piperidyl) amino ] -6-chloro-1, 3, 5-triazine condensate and the like.

Among the above compounds (B), from the viewpoint of easily exerting the effect of the present invention, fatty acids (unsaturated C12-21 and C18) 2,2,6, 6-tetramethyl-4-piperidyl ester, bis (2,2,6, 6-tetramethyl-4-piperidyl) sebacate, poly [ { 6-morpholinyl-1, 3, 5-triazine-2, 4-diyl } { (1,2,2,6, 6-pentamethyl-4-piperidyl) imino } hexamethylene { (1,2,2,6, 6-pentamethyl-4-piperidyl) imino } ], and poly [ {6- (1,1,3, 3-tetramethylbutyl) amino-1, 3, 5-triazine-2, 4-diyl } { (2,2,6, 6-tetramethyl-4-piperidyl) imino } hexamethylene { (2,2,6, 6-tetramethyl-4-piperidyl) imino } ], and 1 or more of the compounds represented by the following formula (1).

The content of the compounds (a) and (B) is not particularly limited as long as the above-mentioned relational formula 1 is satisfied. In particular, the lower limit of the content of the compound (a) is preferably 0.01 part by mass or more, more preferably 0.10 part by mass or more, per 100 parts by mass of the cycloolefin-based resin, from the viewpoint of easily exhibiting the effect of the present invention. The upper limit of the content of the compound (a) is not particularly limited, and is 2.00 parts by mass or less per 100 parts by mass of the cycloolefin-based resin. The lower limit of the content of the compound (B) is preferably 0.01 part by mass or more, and more preferably 0.10 part by mass or more, per 100 parts by mass of the cycloolefin-based resin. The upper limit of the content of the compound (B) is not particularly limited, but is preferably 2.00 parts by mass or less based on 100 parts by mass of the cycloolefin-based resin.

The lower limit of the content of the compound (a) is preferably 0.01 mass% or more, more preferably 0.10 mass% or more in the resin composition. The upper limit of the content of the compound (a) is not particularly limited, but is preferably 2.00 mass% or less in the resin composition. The lower limit of the content of the compound (B) is preferably 0.01% by mass or more, more preferably 0.10% by mass or more, in the resin composition. The upper limit of the content of the compound (B) is not particularly limited, but is preferably 2.00 mass% or less in the resin composition.

(ultraviolet absorber)

The ultraviolet absorber is blended with the compound (a) and the compound (B) in the composition containing the cycloolefin-based resin, whereby heat resistance, light resistance, and moist heat resistance can be imparted to a molded article obtained from the resin composition in a well-balanced manner.

The kind of the ultraviolet absorber is not particularly limited, and examples thereof include benzotriazole-based ultraviolet absorbers (2- (2H-benzotriazol-2-yl) -4-6-bis (1-methyl-1-phenylmethyl) phenol), 2' -methylenebis [6- (2H-benzotriazol-2-yl) -4- (1,1,3, 3-tetramethylbutyl) phenol ], triazine-based ultraviolet absorbers (2- [4, 6-bis (2, 4-dimethylphenyl) -1,3, 5-triazin-2-yl ] -5- (octyloxy) phenol), bis {2- [4- (4, 6-diphenyl-1, 3, 5-triazin-2-yl) -3-hydroxyphenoxy ] ethyl } dodecane-bis Acid esters, etc.), other ultraviolet absorbers (2,2- (1, 4-xylylene) tetraethyl dipropionate, etc.).

The ultraviolet absorber may be used alone in 1 kind, or may be used in combination in2 or more kinds.

The content of the ultraviolet absorber is not particularly limited. From the viewpoint of facilitating the improvement of heat resistance, light resistance, and moist heat resistance in a well-balanced manner, the lower limit of the content of the ultraviolet absorber is preferably 0.01 parts by mass or more, and more preferably 0.10 parts by mass or more, per 100 parts by mass of the cycloolefin-based resin. The upper limit of the content of the ultraviolet absorber is not particularly limited, and is 2.00 parts by mass or less per 100 parts by mass of the cycloolefin-based resin. The lower limit of the content of the ultraviolet absorber is preferably 0.01 mass% or more, more preferably 0.10 mass% or more in the resin composition. The upper limit of the content of the ultraviolet absorber is preferably 2.00 mass% or less in the resin composition.

From the viewpoint of facilitating improvement of heat resistance, light resistance, and moist heat resistance in a well-balanced manner, it is particularly preferable to blend the content of the ultraviolet absorber and the content of the compound (B) so as to satisfy the following relational expression 2, that is, so that the content of the ultraviolet absorber and the content of the compound (B) are equal to each other, or the content of the compound (B) is larger than the content of the ultraviolet absorber.

The amount of the ultraviolet absorber per 100 parts by mass of the cycloolefin-based resin is not more than the amount of the compound (B) per 100 parts by mass of the cycloolefin-based resin

The content of the compound (B) may be preferably 1 time or more, more preferably 2 times or more, and further preferably 3 times or more, based on the content of the ultraviolet absorber. The content of the compound (B) may be preferably 5 times or less, more preferably 3 times or less, based on the content of the ultraviolet absorber.

(condensed phosphoric acid ester)

The condensed phosphoric ester can impart good light resistance to a molded article obtained from the cycloolefin resin-containing composition without inhibiting the actions of the compound (a), the compound (B), and the ultraviolet absorber, and can suppress yellowing of the molded article.

Specific examples of the condensed phosphate ester include 1, 3-phenylene bis (diphenyl phosphate), 1, 3-phenylene bis (di-4-methylphenyl phosphate), 1, 3-phenylene bis (di-2, 6-dimethylphenyl phosphate), 1, 4-phenylene bis (diphenyl phosphate), 1, 4-phenylene bis (di-2, 6-dimethylphenyl phosphate), 4 '-biphenylene bis (diphenyl phosphate), 4' -biphenylene bis (di-2, 6-dimethylphenyl phosphate); hydroquinone phosphates and biphenol phosphates corresponding to these phosphates; and condensed phosphoric acid esters such as biphenol-A phosphoric acid esters.

Among the above, 1, 3-phenylenebis (di-2, 6-xylyl phosphate) is particularly preferable from the viewpoint of easy improvement of light resistance.

The condensed phosphoric acid ester may be used alone in 1 kind, or may be used in combination of 2 or more kinds.

The content of the condensed phosphoric ester is not particularly limited. The lower limit of the content of the condensed phosphoric ester is preferably 0.05 parts by mass or more, and more preferably 0.10 parts by mass or more, per 100 parts by mass of the cycloolefin-based resin, from the viewpoint of easily imparting light resistance to a molded article obtained from the resin composition. The upper limit of the content of the condensed phosphoric ester is not particularly limited, and is 1.00 parts by mass or less per 100 parts by mass of the cycloolefin-based resin. The lower limit of the content of the condensed phosphoric ester is preferably 0.05% by mass or more, and more preferably 0.10% by mass or more in the resin composition. The upper limit of the content of the condensed phosphoric ester is preferably 1.00% by mass or less in the resin composition.

(Block copolymer comprising styrene in the Main chain)

The block copolymer containing styrene in the main chain (hereinafter also referred to as "block copolymer in the present invention") can impart good moist heat resistance to a molded article obtained from the composition containing a cycloolefin-based resin without interfering with the actions of the compound (a), the compound (B), and the ultraviolet absorber, and can suppress the occurrence of cracks in the molded article in a moist heat resistant environment.

The block copolymer in the present invention is not particularly limited as long as it contains styrene in the main chain, and those having an aromatic vinyl polymer block (hard segment) and a rubber block (soft segment), or hydrides thereof and the like can be used. The hard segment and the soft segment may be formed of only 1 kind of monomer or may be formed of a plurality of kinds of monomers, respectively. The block copolymer of the present invention may be used alone in 1 kind, or may be used in combination in2 or more kinds.

The aromatic vinyl compound (monomer) forming the hard segment contains at least substituted or unsubstituted styrene. By containing a substituted or unsubstituted styrene as the aromatic vinyl compound, when a molded article obtained from the resin composition is subjected to a wet heat treatment, the entry of cracks into the molded article can be suppressed. Further, by including substituted or unsubstituted styrene as the aromatic vinyl compound, the refractive index of the block copolymer in the present invention can be easily made close to the refractive index of the cycloolefin resin, and the transparency of the molded article obtained from the resin composition can be easily improved.

In addition, if the content of the repeating unit derived from the aromatic vinyl compound in the block copolymer of the present invention is large, cracks are likely to enter the inside of the resin molded product when the molded product obtained from the resin composition is subjected to a heat and moisture treatment. On the other hand, if the content is small, the difference between the refractive index of the block copolymer of the present invention and the refractive index of the cycloolefin-based resin as the matrix becomes excessively large, and therefore, the block copolymer of the present invention may cause large refraction and scattering of light from the dispersion, and the transparency of the molded article may be deteriorated. Therefore, the content of the repeating unit derived from the aromatic vinyl compound is adjusted in consideration of the above-mentioned problems and the degree of cracking. In order to prevent cracking during the wet heat treatment of the resin molded article, the upper limit of the content (the content of the repeating unit derived from the aromatic vinyl polymer block in the block copolymer of the present invention) is preferably 70% by mass or less, more preferably 65% by mass or less, and the lower limit thereof is preferably 45% by mass or more, more preferably 51% by mass or more.

From the viewpoint of particularly easily suppressing yellowing and cracking of a molded article obtained from the resin composition, the upper limit of the styrene content in the block copolymer of the present invention (the content of a repeating unit derived from a substituted or unsubstituted styrene in the block copolymer of the present invention) is preferably 70% by mass or less, more preferably 65% by mass or less, and the lower limit is preferably 45% by mass or more, more preferably 51% by mass or more.

Examples of the substituted styrene include α -alkyl substituted styrenes such as α -methylstyrene, α -ethylstyrene, and α -methyl-p-methylstyrene; nuclear alkyl-substituted styrenes such as o-methylstyrene, m-methylstyrene, p-methylstyrene, 2, 4-dimethylstyrene, ethylstyrene, 2,4, 6-trimethylstyrene, o-tert-butylstyrene, p-tert-butylstyrene, and p-cyclohexylstyrene; nuclear halogenated styrenes such as o-chlorostyrene, m-chlorostyrene, p-bromostyrene, and 2-methyl-4-chlorostyrene.

As the compound (monomer) forming the soft segment, one constituting a general block copolymer can be used. Specific examples thereof include α -olefins (α -C2-12 olefins such as ethylene, propylene, 1-butene, 1-hexene and 1-octene), diene monomers (butadiene, isoprene and the like), and the like.

When the content of the repeating unit derived from the soft segment-forming compound in the block copolymer of the present invention is increased, cracks in molding easily enter when a molded article obtained from the resin composition is subjected to a moist heat treatment. On the other hand, if the content is too large, the difference between the refractive index of the block copolymer of the present invention and the refractive index of the cycloolefin-based resin as the matrix becomes excessively large, and therefore, the block copolymer of the present invention has a problem in that the refraction and scattering of light from the dispersion become large, and the transparency of the molded article is impaired. Therefore, the content of the repeating unit derived from the above compound is adjusted while taking the above problems and the degree of cracking into consideration. The upper limit of the above-mentioned content (content of the repeating unit derived from the compound forming the soft segment in the block copolymer of the present invention) is preferably 55% by mass or less, more preferably 49% by mass or less, and the lower limit thereof is preferably 30% by mass or more, more preferably 35% by mass or more.

Specific examples of the block copolymer in the present invention include styrene-butadiene copolymer (SBR), styrene-butadiene-styrene copolymer (SBS), hydrogenated styrene-butadiene copolymer (H-SBR), hydrogenated styrene-butadiene-styrene copolymer (SEBS), hydrogenated styrene-isoprene-styrene copolymer (SEPS), styrene-isobutylene-styrene copolymer (SIBS), hydrogenated styrene-isoprene-butadiene-styrene copolymer (SEEPS), and styrene-isoprene-styrene copolymer (SIS).

In the block copolymer of the present invention, from the viewpoint of particularly easily suppressing yellowing and cracking of a molded article obtained from the resin composition, it is preferable that the styrene content (content of a repeating unit derived from substituted or unsubstituted styrene in the block copolymer of the present invention) is 45 mass% or more and 70 mass% or less, and that the block copolymer contains a hydrogenated product of styrene and a block copolymer of butadiene and/or isoprene (SEBS, SEPS, SEEPS, or the like).

The content of the block copolymer in the present invention is not particularly limited. The lower limit of the content of the block copolymer in the present invention is preferably 0.1 part by mass or more, more preferably 0.5 part by mass or more, per 100 parts by mass of the cycloolefin-based resin, from the viewpoint of easily imparting moist heat resistance to a molded article obtained from the resin composition. The upper limit of the content of the block copolymer in the present invention is not particularly limited, and is 1.0 part by mass or less based on 100 parts by mass of the cycloolefin-based resin. The lower limit of the content of the block copolymer in the present invention is preferably 0.1% by mass or more, more preferably 0.5% by mass or more, in the resin composition. The upper limit of the content of the block copolymer in the present invention is preferably 1.0% by mass or less in the resin composition.

(other Components)

In the resin composition of the present invention, components other than the above may be blended. Examples of such other components include additives such as thermoplastic resins other than cyclic olefin resins, lubricants, stabilizers, reinforcing agents, plasticizers, and pigments. The kind and amount of these resins and additives can be appropriately selected depending on the desired effects and the like.

< method for producing resin composition >

The method for producing the resin composition of the present invention is not particularly limited. The resin composition of the present invention can be prepared by a known apparatus and method which are generally known as a method for preparing a resin composition. For example, the pellets for molding can be prepared by mixing the desired components, kneading the mixture using a single-screw extruder, a twin-screw extruder, or another melt-kneading apparatus. All the components may be fed simultaneously from the hopper and melt-kneaded, or a part of the components may be fed from the side inlet and melt-kneaded.

< method for producing molded article >

The molded article can be produced by a conventionally known molding method using the resin composition of the present invention. Conventionally known molding methods include injection molding, extrusion molding and the like.

The molded article obtained from the resin composition of the present invention is not particularly limited, and examples thereof include a camera lens, a pickup lens, a projector lens, a lens of a lighting device (a device using an LED, a cold cathode tube, or the like), a lamp cover, a light guide plate, a resin window, an optical film, an optical sheet, and the like.

< molded article of the present invention >

The molded article obtained from the resin composition of the present invention is excellent in heat resistance, light resistance and moist heat resistance, and is inhibited from yellowing and cracking. The heat resistance, light resistance, moist heat resistance, yellowing and cracking were evaluated by the methods shown in examples.