阅读说明：本技术 丙烯酸橡胶、丙烯酸橡胶组合物、丙烯酸橡胶交联物、密封材料以及软管材料 (Acrylic rubber, acrylic rubber composition, crosslinked acrylic rubber, sealing material, and hose material ) 是由 坂东文明 佐藤奖 于 2019-03-18 设计创作，主要内容包括：一种丙烯酸橡胶,其具有丙烯酸酯单体单元、甲基丙烯酸酯单体单元以及交联性单体单元,玻璃化转变温度为-20℃以下,将上述丙烯酸橡胶的橡胶交联物在150±2℃的IRM903油中浸渍72小时后的体积变化率为0～100％,将上述丙烯酸橡胶的橡胶交联物在150±2℃的热水中浸渍96小时、干燥后的重量变化率为-5.0～0％。(An acrylic rubber having an acrylate monomer unit, a methacrylate monomer unit and a crosslinkable monomer unit, wherein the glass transition temperature is-20 ℃ or lower, the rate of change in volume of a rubber crosslinked product of the acrylic rubber after immersion in IRM903 oil at 150 + -2 ℃ for 72 hours is 0 to 100%, and the rate of change in weight of the rubber crosslinked product of the acrylic rubber after immersion in hot water at 150 + -2 ℃ for 96 hours and drying is-5.0 to 0%.)

1. An acrylic rubber comprising an acrylate monomer unit, a methacrylate monomer unit, and a crosslinkable monomer unit,

the glass transition temperature is below-20 ℃,

the volume change rate of the rubber cross-linked product of the acrylic rubber after being soaked in IRM903 oil at 150 +/-2 ℃ for 72 hours is 0-100%,

the rubber crosslinked material of the acrylic rubber is immersed in hot water at 150 +/-2 ℃ for 96 hours, and the weight change rate after drying is-5.0-0%.

2. The acrylic rubber according to claim 1, wherein the acrylic ester constituting the acrylic ester monomer unit is at least 1 selected from the group consisting of methyl acrylate, ethyl acrylate, n-butyl acrylate, 2-ethylhexyl acrylate, n-octyl acrylate, and 2-methoxyethyl acrylate.

3. The acrylic rubber according to claim 1 or 2, wherein the methacrylate ester constituting the methacrylate ester monomer unit is at least 1 selected from the group consisting of alkyl methacrylate, alkoxyalkyl methacrylate, polyalkylene glycol methacrylate, and alkoxypolyalkylene glycol methacrylate.

4. The acrylic rubber according to any one of claims 1 to 3, wherein the methacrylate ester constituting the methacrylate ester monomer unit is at least 1 selected from the group consisting of methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, n-butyl methacrylate, 2-methoxyethyl methacrylate, 2-ethoxyethyl methacrylate, 1-methyl-2-methoxyethyl methacrylate, diethylene glycol methacrylate, ethylene glycol methacrylate, triethylene glycol methacrylate, methoxydiethylene glycol methacrylate, and methoxytriethylene glycol methacrylate.

5. The acrylic rubber according to any one of claims 1 to 4, wherein the crosslinkable monomer constituting the crosslinkable monomer unit is a monomer having a carboxyl group.

6. An acrylic rubber composition comprising the acrylic rubber according to any one of claims 1 to 5.

7. An acrylic rubber crosslinked product obtained by crosslinking the acrylic rubber composition according to claim 6.

8. A sealing material comprising the acrylic rubber crosslinked material according to claim 7.

9. A hose material having the acrylic rubber crosslinked material according to claim 7.

Technical Field

The present invention relates to an acrylic rubber, an acrylic rubber composition, a crosslinked acrylic rubber, a sealing material and a hose material.

Background

Acrylic rubber is widely used as a rubber material capable of obtaining a rubber crosslinked product excellent in oil resistance, thermal aging resistance, and cold resistance, for various sealing materials, functional parts such as hose materials, and the like, mainly for automobile applications.

For example, patent document 1 discloses an acrylic rubber obtained by copolymerizing 100 parts by mass of an alkyl acrylate, 10 to 100 parts by mass of an alkyl methacrylate unit, and 0.5 to 4 parts by mass of a crosslinkable monomer.

Disclosure of Invention

Problems to be solved by the invention

However, in recent years, there is a fear that the rubber member is affected for the following reasons: the thermal environment conditions around the internal combustion engine become severe due to the high output of the internal combustion engine, exhaust measures, and the like; and engine oil (engine oil) which is used for a long time under high temperature conditions without replacement, and which is deteriorated by contact with heat, air, moisture, exhaust gas, etc. Therefore, when the rubber crosslinked material of the acrylic rubber is used for a sealing member or a hose member for an automobile which is in contact with an engine oil or the like, it is required to have resistance to a deteriorated engine oil (hereinafter referred to as "deteriorated engine oil").

The invention provides an acrylic rubber which can obtain an acrylic rubber crosslinked material with excellent heat aging resistance, oil resistance, cold resistance and deterioration oil resistance.

Means for solving the problems

One embodiment of the present invention is an acrylic rubber having an acrylate monomer unit, a methacrylate monomer unit, and a crosslinkable monomer unit, wherein the glass transition temperature is-20 ℃ or lower, the rate of change in volume of a rubber crosslinked product of the acrylic rubber after immersion in IRM903 oil at 150 ± 2 ℃ for 72 hours is 0 to 100%, the rate of change in weight of the rubber crosslinked product of the acrylic rubber after immersion in hot water at 150 ± 2 ℃ for 96 hours is-5.0 to 0%.

Effects of the invention

According to one embodiment of the present invention, an acrylic rubber is provided that can provide an acrylic rubber crosslinked product having excellent heat aging resistance, oil resistance, cold resistance, and deterioration oil resistance.

Detailed Description

The embodiments of the present invention will be described in detail below.

< acrylic rubber >

The acrylic rubber of the embodiment of the present invention comprises an acrylic ester monomer unit, a methacrylic ester monomer unit and a crosslinkable monomer unit, has a glass transition temperature (hereinafter referred to as glass transition temperature Tg) of-20 ℃ or lower, has a volume change rate (hereinafter referred to as volume change rate DeltaV) of 0 to 100% after a rubber crosslinked product of the acrylic rubber is immersed in IRM903 oil at 150 + -2 ℃ for 72 hours, and has a weight change rate (hereinafter referred to as weight change rate DeltaW) of-5.0 to 0% after the rubber crosslinked product of the acrylic rubber is immersed in hot water at 150 + -2 ℃ for 96 hours and dried.

The acrylic ester constituting the acrylic ester monomer unit included in the acrylic rubber of the present embodiment is not particularly limited, and examples thereof include alkyl acrylate and alkoxyalkyl acrylate.

The alkyl acrylate is not particularly limited, but esters of an alkanol having 1 to 8 carbon atoms and acrylic acid are preferable, and specific examples thereof include methyl acrylate, ethyl acrylate, n-propyl acrylate, isopropyl acrylate, n-butyl acrylate, isobutyl acrylate, n-hexyl acrylate, 2-ethylhexyl acrylate, cyclohexyl acrylate, and n-octyl acrylate. Among these, methyl acrylate, ethyl acrylate, n-butyl acrylate, 2-ethylhexyl acrylate, and n-octyl acrylate are preferable, and methyl acrylate, ethyl acrylate, and n-butyl acrylate are more preferable. These can be used alone in 1 or more than 2.

The alkoxyalkyl acrylate is not particularly limited, but is preferably an ester of an alkoxyalkyl alcohol having 2 to 8 carbon atoms and acrylic acid, and specific examples thereof include methoxymethyl acrylate, ethoxymethyl acrylate, 1-methoxyethyl acrylate, 2-methoxyethyl acrylate, 1-ethoxyethyl acrylate, 2-ethoxyethyl acrylate, 1-propoxyethyl acrylate, 2-propoxyethyl acrylate, 1-butoxyethyl acrylate, 2-butoxyethyl acrylate, 1-methoxypropyl acrylate, 2-methoxypropyl acrylate, 3-ethoxypropyl acrylate, and the like, 1-methoxybutyl acrylate, 2-methoxybutyl acrylate, 3-methoxybutyl acrylate, 4-methoxybutyl acrylate, and 4-ethoxybutyl acrylate. Among these, 2-methoxyethyl acrylate is preferred. These can be used alone in 1 or more than 2.

The content of the acrylate monomer unit is not particularly limited, and is preferably 10.0 wt% or more, more preferably 20.0 wt% or more, further preferably 30.0 wt% or more, particularly preferably 40.0 wt% or more, and is preferably 95.0 wt% or less, more preferably 90.0 wt% or less, further preferably 85.0 wt% or less, particularly preferably 80.0 wt% or less, relative to 100 wt% in total of all monomer units constituting the acrylic rubber. When the content of the acrylate monomer unit is too small, the oil resistance and the cold resistance of the resulting rubber crosslinked product are lowered, while when the content of the acrylate monomer unit is too large, the deterioration oil resistance of the resulting rubber crosslinked product is lowered.

In the present embodiment, the content of the alkyl acrylate monomer unit is preferably 0% by weight or more, more preferably 5% by weight or more, further preferably 10% by weight or more, particularly preferably 25% by weight or more, most preferably 40% by weight or more, and preferably 95% by weight or less, more preferably 90% by weight or less, further preferably 85% by weight or less, based on 100% by weight of the total monomer units constituting the acrylic rubber.

The content of the alkoxyalkyl acrylate monomer unit is preferably 0 wt% or more and 50 wt% or less, more preferably 0 wt% or more and 40 wt% or less, further preferably 0 wt% or more and 30 wt% or less, and particularly preferably 0 wt% or more and 25 wt% or less, based on 100 wt% in total of all monomer units constituting the acrylic rubber. They can be used in combination of each other.

The methacrylate ester constituting the methacrylate ester monomer unit included in the acrylic rubber of the present embodiment is not particularly limited, and examples thereof include alkyl methacrylate, alkoxyalkyl methacrylate, polyalkylene glycol methacrylate, and alkoxypolyalkylene glycol methacrylate. These can be used alone in 1 or more than 2.

The alkyl methacrylate is not particularly limited, but esters of alkanols having 1 to 8 carbon atoms and methacrylic acid are preferable, and specific examples thereof include methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, n-hexyl methacrylate, 2-ethylhexyl methacrylate, cyclohexyl methacrylate, and n-octyl methacrylate. Among these, methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, and n-butyl methacrylate are preferable. These can be used alone in 1 or more than 2.

The alkoxyalkyl methacrylate is not particularly limited, but is preferably an ester of an alkoxyalkyl alcohol having 2 to 8 carbon atoms and methacrylic acid, more preferably an ester of an alkoxyalkyl alcohol having 3 to 6 carbon atoms and methacrylic acid, and still more preferably an ester of an alkoxyalkyl alcohol having 3 to 4 carbon atoms and methacrylic acid. Specific examples thereof include methoxymethyl methacrylate, ethoxymethyl methacrylate, 1-methoxyethyl methacrylate, 2-methoxyethyl methacrylate, 1-ethoxyethyl methacrylate, 2-ethoxyethyl methacrylate, 1-propoxyethyl methacrylate, 2-propoxyethyl methacrylate, 1-butoxyethyl methacrylate, 2-butoxyethyl methacrylate, 1-methoxypropyl methacrylate, 2-methoxypropyl methacrylate, 3-methoxypropyl methacrylate, 4-methoxybutyl methacrylate, 1-methyl-2-methoxyethyl methacrylate, and the like, 1-ethyl-2-methoxyethyl methacrylate, tetrahydrofurfuryl methacrylate, and the like. Among these, 2-methoxyethyl methacrylate, 2-ethoxyethyl methacrylate, and 1-methyl-2-methoxyethyl methacrylate are preferable, and 2-methoxyethyl methacrylate and 2-ethoxyethyl methacrylate are more preferable.

The polyalkylene glycol methacrylate is not particularly limited, but esters of polyalkylene glycol having 2 to 30 carbon atoms and methacrylic acid are preferable, and specific examples thereof include ethylene glycol methacrylate, diethylene glycol methacrylate, triethylene glycol methacrylate, tetraethylene glycol methacrylate, polyethylene glycol methacrylate, propylene glycol methacrylate, dipropylene glycol methacrylate, polypropylene glycol methacrylate, and the like. Among these, diethylene glycol methacrylate and triethylene glycol methacrylate are preferable. These can be used alone in 1 or more than 2.

The alkoxypolyalkylene glycol methacrylate is not particularly limited, but is preferably an ester of an alkoxypolyalkylene glycol having 5 to 32 carbon atoms and methacrylic acid, more preferably an ester of an alkoxypolyalkylene glycol having 5 to 11 carbon atoms and methacrylic acid, and still more preferably an ester of an alkoxypolyalkylene glycol having 5 to 7 carbon atoms and methacrylic acid. Specific examples thereof include, for example, methoxy diglycol methacrylate, methoxy triglycol methacrylate, ethoxy diglycol methacrylate, ethoxy triglycol methacrylate, methoxy dipropyleneglycol methacrylate, methoxy tripropylene glycol methacrylate, methoxy polyethylene glycol methacrylate, ethoxy polyethylene glycol methacrylate, methoxy polypropylene glycol methacrylate, and ethoxy polypropylene glycol methacrylate. Among these, methoxydiglycol methacrylate, methoxytriglycol methacrylate, ethoxydiglycol methacrylate, and ethoxytriglycol methacrylate are preferable, and methoxydiglycol methacrylate and methoxytriglycol methacrylate are more preferable. These can be used alone in 1 or more than 2.

The content of the methacrylate monomer unit is not particularly limited, and is preferably 4.9% by weight or more, more preferably 9.9% by weight or more, further preferably 14.9% by weight or more, particularly preferably 17.9% by weight or more, and preferably 85.0% by weight or less, more preferably 75.0% by weight or less, further preferably 65.0% by weight or less, and particularly preferably 55.0% by weight or less, based on 100% by weight in total of all monomer units constituting the acrylic rubber. When the content of the methacrylate monomer unit is too small, the oil resistance, thermal aging resistance and deterioration resistance of the resulting rubber vulcanizate cannot be sufficiently obtained, and when the content of the methacrylate monomer unit is too large, the cold resistance of the resulting rubber vulcanizate tends to be low.

In the present embodiment, when the total content of the acrylate monomer units and the methacrylate monomer units is 100% by weight, the acrylate monomer units are preferably 10% by weight or more, more preferably 25% by weight or more, further preferably 40% by weight or more, and preferably 95% by weight or less, more preferably 90% by weight or less, and further preferably 85% by weight or less, and the methacrylate monomer units are preferably 5% by weight or more, more preferably 10% by weight or more, further preferably 15% by weight or more, and preferably 85% by weight or less, more preferably 75% by weight or less, and further preferably 65% by weight or less.

In the present embodiment, the content of the alkyl methacrylate monomer unit is preferably 0% by weight or more and 50% by weight or less, more preferably 0% by weight or more and 40% by weight or less, and further preferably 0% by weight or more and 30% by weight or less, based on 100% by weight in total of all monomer units constituting the acrylic rubber.

The content of the alkoxyalkyl methacrylate monomer unit is preferably 0 wt% or more, more preferably 5 wt% or more, and further preferably 10 wt% or more, and is preferably 85.0 wt% or less, more preferably 75 wt% or less, and further preferably 65 wt% or less, with respect to 100 wt% in total of all monomer units constituting the acrylic rubber.

The content of the polyalkylene glycol methacrylate monomer unit is preferably 0% by weight or more and 40% by weight or less, more preferably 0% by weight or more and 30% by weight or less, and further preferably 0% by weight or more and 25% by weight or less, based on 100% by weight in total of all monomer units constituting the acrylic rubber.

The content of the alkoxypolyalkylene glycol methacrylate monomer unit is preferably 0% by weight or more and 50% by weight or less, more preferably 0% by weight or more and 40% by weight or less, and still more preferably 0% by weight or more and 30% by weight or less, based on 100% by weight in total of all monomer units constituting the acrylic rubber.

Among these methacrylate monomer units, the alkyl methacrylate monomer unit may be used in combination with at least 1 methacrylate monomer unit (hereinafter referred to as other methacrylate monomer unit) selected from the group consisting of alkoxyalkyl methacrylate, polyalkylene glycol methacrylate, and alkoxypolyalkylene glycol methacrylate. In this case, the content of the alkyl methacrylate monomer units and the other methacrylate monomer units is preferably 0 to 90% by weight, and the content of the other methacrylate monomer units is preferably 10 to 100% by weight. They may be used in combination of each other.

The crosslinkable monomer constituting the crosslinkable monomer unit included in the acrylic rubber of the present embodiment is not particularly limited, and examples thereof include a monomer having a carboxyl group, a monomer having an epoxy group, a monomer having a halogen group (or halogen atom), a diene monomer, and the like. The crosslinkable monomer unit is a structural unit derived from a crosslinkable monomer having a crosslinkable group in a side chain.

The monomer having a carboxyl group is not particularly limited, and examples thereof include an α, β -ethylenically unsaturated carboxylic acid monomer.

The α, β -ethylenically unsaturated carboxylic acid monomer is not particularly limited, and examples thereof include an α, β -ethylenically unsaturated monocarboxylic acid having 3 to 12 carbon atoms, an α, β -ethylenically unsaturated dicarboxylic acid having 4 to 12 carbon atoms, and a monoester of an α, β -ethylenically unsaturated dicarboxylic acid having 4 to 12 carbon atoms and an alkanol having 1 to 8 carbon atoms. By using the α, β -ethylenically unsaturated carboxylic acid monomer, the acrylic rubber can be made into a carboxyl group-containing acrylic rubber having a carboxyl group as a crosslinking point, whereby the compression set resistance can be further improved in the case of producing a rubber crosslinked product.

Specific examples of the α, β -ethylenically unsaturated monocarboxylic acid having 3 to 12 carbon atoms include acrylic acid, methacrylic acid, α -ethylacrylic acid, crotonic acid, cinnamic acid, and the like.

Specific examples of the α, β -ethylenically unsaturated dicarboxylic acid having 4 to 12 carbon atoms include: butenedioic acids such as fumaric acid and maleic acid; itaconic acid; citraconic acid; chloromaleic acid, and the like.

Specific examples of the monoester of an α, β -ethylenically unsaturated dicarboxylic acid having 4 to 12 carbon atoms and an alkanol having 1 to 8 carbon atoms include: mono-chain alkyl fumarates such as monomethyl fumarate, monoethyl fumarate, mono-n-butyl fumarate, monomethyl maleate, monoethyl maleate, and mono-n-butyl maleate; butenedioic acid monoesters having an alicyclic structure such as monocyclopentyl fumarate, monocyclohexyl fumarate, monocyclohexene fumarate, monocyclopentyl maleate, monocyclohexyl maleate, and monocyclohexene maleate; itaconic monoesters such as monomethyl itaconate, monoethyl itaconate, mono-n-butyl itaconate and monocyclohexyl itaconate.

Among these, a butenedioic acid mono-chain alkyl ester or a butenedioic acid monoester having an alicyclic structure is preferable, and mono-n-butyl fumarate, mono-n-butyl maleate, monocyclohexyl fumarate, and monocyclohexyl maleate are more preferable, and mono-n-butyl maleate and mono-n-butyl fumarate are even more preferable. These α, β -ethylenically unsaturated carboxylic acid monomers can be used alone in 1 kind or in combination in 2 or more kinds. In addition, among the above monomers, the dicarboxylic acid also includes a monomer present as an acid anhydride.

The monomer having an epoxy group is not particularly limited, and examples thereof include: epoxy group-containing (meth) acrylates such as glycidyl (meth) acrylate; epoxy group-containing styrenes such as p-vinylbenzyl glycidyl ether; epoxy group-containing ethers such as allyl glycidyl ether, vinyl glycidyl ether, 3, 4-epoxy-1-pentene, 3, 4-epoxy-1-butene, 4, 5-epoxy-2-pentene, 4-vinylcyclohexyl glycidyl ether, cyclohexenylmethyl glycidyl ether, 3, 4-epoxy-1-vinylcyclohexene, and allyl phenyl glycidyl ether.

In the present specification, "(meth) acrylic acid" means both "acrylic acid" and "methacrylic acid". Accordingly, the above-mentioned glycidyl (meth) acrylate means glycidyl acrylate and/or glycidyl methacrylate.

The monomer having a halogen group is not particularly limited, and examples thereof include unsaturated alcohol esters of halogen-containing saturated carboxylic acids, halogenated alkyl (meth) acrylates, halogenated acyloxyalkyl (meth) acrylates, (halogenated acetylcarbamoyloxy) alkyl (meth) acrylates, halogen-containing unsaturated ethers, halogen-containing unsaturated ketones, halogen-containing methyl aromatic vinyl compounds, halogen-containing unsaturated amides, and halogen-containing acetyl unsaturated monomers.

Specific examples of the unsaturated alcohol ester of a halogen-containing saturated carboxylic acid include vinyl chloroacetate, vinyl 2-chloropropionate, allyl chloroacetate, and the like.

Specific examples of the haloalkyl (meth) acrylate include chloromethyl (meth) acrylate, 1-chloroethyl (meth) acrylate, 2-chloroethyl (meth) acrylate, 1, 2-dichloroethyl (meth) acrylate, 2-chloropropyl (meth) acrylate, 3-chloropropyl (meth) acrylate, and 2, 3-dichloropropyl (meth) acrylate.

Specific examples of the haloalkyloxyalkyl (meth) acrylate include 2- (chloroacetyloxy) ethyl (meth) acrylate, 2- (chloroacetyloxy) propyl (meth) acrylate, 3- (chloroacetyloxy) propyl (meth) acrylate, and 3- (hydroxychloroacetoxy) propyl (meth) acrylate.

Specific examples of the (haloacetylcarbamoyloxy) alkyl (meth) acrylate include 2- (chloroacetylcarbamoyloxy) ethyl (meth) acrylate and 3- (chloroacetylcarbamoyloxy) propyl (meth) acrylate.

Specific examples of the halogen-containing unsaturated ether include chloromethyl vinyl ether, 2-chloroethyl vinyl ether, 3-chloropropyl vinyl ether, 2-chloroethyl allyl ether, and 3-chloropropyl allyl ether.

Specific examples of the halogen-containing unsaturated ketone include 2-chloroethylvinyl ketone, 3-chloropropylvinyl ketone, and 2-chloroethylallyl ketone.

Specific examples of the halogenomethyl-containing aromatic vinyl compound include p-chloromethylstyrene, m-chloromethylstyrene, o-chloromethylstyrene, and p-chloromethyl- α -methylstyrene.

Specific examples of the halogen-containing unsaturated amide include N-chloromethyl (meth) acrylamide and the like.

Specific examples of the halogenated acetyl group-containing unsaturated monomer include 3- (hydroxychloroacetoxy) propyl allyl ether, p-vinylbenzylchloroacetate, and the like.

The diene monomer is not particularly limited, and examples thereof include a conjugated diene monomer and a non-conjugated diene monomer. In the case where the polyfunctional monomer is contained, the diene monomer is a diene monomer other than the monomers of the components contained in the polyfunctional monomer.

Specific examples of the conjugated diene monomer include 1, 3-butadiene, isoprene, and piperylene.

Specific examples of the non-conjugated diene monomer include ethylidene norbornene, dicyclopentadiene, dicyclopentadienyl (meth) acrylate, and 2-dicyclopentadienyl ethyl (meth) acrylate.

Among the crosslinkable monomers, a monomer unit having a carboxyl group, an epoxy group, and a halogen group is preferable, and a monomer unit having a carboxyl group is more preferable. Further, among the monomer units having a carboxyl group, an α, β -ethylenically unsaturated carboxylic acid monomer is preferable, and a monoester of an α, β -ethylenically unsaturated dicarboxylic acid having 4 to 12 carbon atoms and an alkanol having 1 to 8 carbon atoms is more preferable. In the case of using an α, β -ethylenically unsaturated carboxylic acid monomer, the acrylic rubber can be made a carboxyl group-containing acrylic rubber. By using the carboxyl group-containing acrylic rubber as the acrylic rubber, the deteriorated engine oil resistance can be improved, and the heat aging resistance and the compression set resistance can be improved.

The content of the crosslinkable monomer unit is preferably 0.1% by weight or more, more preferably 0.5% by weight or more, and further preferably 0.6% by weight or more, and preferably 10% by weight or less, more preferably 6% by weight or less, and further preferably 4.0% by weight or less, based on 100% by weight in total of all monomer units constituting the acrylic rubber. When the crosslinkable monomer unit content is less than 0.1% by weight, the acrylic rubber is not sufficiently crosslinked, and sufficient mechanical strength cannot be obtained. When the content exceeds 10% by weight, the acrylic rubber is excessively crosslinked, and the elongation of the crosslinked product is lowered.

The acrylic rubber of the present embodiment may have units of other copolymerizable monomers in addition to the above-mentioned acrylate monomer unit, methacrylate monomer unit, and crosslinkable monomer unit, as long as the properties of the acrylic rubber are maintained.

The other copolymerizable monomer is not particularly limited, and examples thereof include olefin monomers, aromatic vinyl monomers, α, β -ethylenically unsaturated dicarboxylic acid diester monomers, α, β -ethylenically unsaturated nitrile monomers, halogenated vinyl compounds, vinyl ether compounds, vinyl ester compounds and the like.

The olefin-based monomer is not particularly limited, and examples thereof include ethylene, propylene, 1-butene, 2-butene, 1-hexene, and 1-octene. Among these, ethylene is preferred.

The aromatic vinyl monomer is not particularly limited, and examples thereof include styrene, α -methylstyrene, p-dimethylaminostyrene, divinylbenzene, 2-vinylpyridine, and 4-vinylpyridine.

The alpha, beta-ethylenically unsaturated dicarboxylic acid diester monomer is not particularly limited, and includes, for example, diesters of an alpha, beta-ethylenically unsaturated dicarboxylic acid having 4 to 12 carbon atoms and an alcohol having 1 to 8 carbon atoms. The 2 organic groups of the diester may be the same or different. Specific examples of the α, β -ethylenically unsaturated dicarboxylic acid diester include: maleic acid diesters such as dimethyl maleate, diethyl maleate, dipropyl maleate, di-n-butyl maleate, diisobutyl maleate, dicyclopentyl maleate, dicyclohexyl maleate, dibenzyl maleate, diphenyl maleate and the like; fumaric acid diesters such as dimethyl fumarate, diethyl fumarate, dipropyl fumarate, di-n-butyl fumarate, diisobutyl fumarate, dicyclopentyl fumarate, dicyclohexyl fumarate, dibenzyl fumarate and diphenyl fumarate; citraconic acid diesters such as dimethyl citraconate, diethyl citraconate, dipropyl citraconate, di-n-butyl citraconate, dibenzyl citraconate, and diphenyl citraconate; itaconic acid diesters such as dimethyl itaconate, diethyl itaconate, di-n-butyl itaconate, diisobutyl itaconate, dicyclohexyl itaconate, dibenzyl itaconate and diphenyl itaconate; mesaconic acid diesters such as dimethyl mesaconate, diethyl mesaconate, dipropyl mesaconate, di-n-butyl mesaconate, dibenzyl mesaconate, and diphenyl mesaconate; 2-pentenedioic acid diesters such as dimethyl 2-pentenedioate, diethyl 2-pentenedioate, dipropyl 2-pentenedioate, di-n-butyl 2-pentenedioate, dibenzyl 2-pentenedioate, and diphenyl 2-pentenedioate; acetylene dicarboxylic acid dicyclohexyl and the like.

The α, β -ethylenically unsaturated nitrile monomer is not particularly limited, and examples thereof include acrylonitrile, methacrylonitrile, vinylidene cyanide, and the like.

The halogenated vinyl compound is not particularly limited, and examples thereof include vinyl chloride, vinylidene chloride, and allyl chloride.

The vinyl ether compound is not particularly limited, and examples thereof include ethyl vinyl ether, dimethylaminoethyl vinyl ether, and n-butyl vinyl ether.

The vinyl ester compound is not particularly limited, and examples thereof include vinyl acetate, vinyl propionate, vinyl pivalate, vinyl benzoate, and vinyl cinnamate.

In addition, in addition to these, there may be mentioned: monomers having 2 or more (meth) acryloyloxy groups (polyfunctional acryloyl monomers) such as ethylene glycol (meth) acrylate diester, propylene glycol (meth) acrylate diester, 1, 4-butanediol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, and the like; diallyl compounds such as diallyl phthalate and diallyl fumarate; polyfunctional (meth) acryloyl monomers such as allyl (meth) acrylate and dicyclopentenyl (meth) acrylate; acrylamide monomers such as (meth) acrylamide, N-hydroxy (meth) acrylamide, N-dimethylacrylamide, N-diethylacrylamide, and N-isopropyl (meth) acrylamide; hydroxyl group-containing (meth) acrylate monomers such as 2-hydroxyethyl (meth) acrylate and 2-hydroxypropyl (meth) acrylate; nitrogen-containing group (meth) acrylate monomers such as 2-aminoethyl (meth) acrylate, N-methylaminoethyl (meth) acrylate, N-dimethylaminoethyl (meth) acrylate, N-ethylaminoethyl (meth) acrylate, and N, N-diethylaminoethyl (meth) acrylate; and optional compounds such as maleimide, methylmaleimide, ethylmaleimide, phenylmaleimide, vinylimidazole, and N-vinylpyrrolidone.

Among these, preferred are ethylene, styrene, dimethyl maleate, diethyl maleate, dipropyl maleate, di-n-butyl maleate, diisobutyl maleate, dimethyl fumarate, diethyl fumarate, dipropyl fumarate, di-n-butyl fumarate, diisobutyl fumarate, dimethyl itaconate, diethyl itaconate, dipropyl itaconate, di-n-butyl itaconate, diisobutyl itaconate, acrylonitrile, vinyl acetate and vinyl propionate, and more preferred are ethylene, diethyl maleate, di-n-butyl maleate, diethyl fumarate, di-n-butyl fumarate, diethyl itaconate, di-n-butyl itaconate, acrylonitrile and vinyl acetate.

The other copolymerizable monomers may be used alone in 1 kind, or 2 or more kinds may be used in combination. The content of the unit of the other monomer in the acrylic rubber of the present embodiment is 40% by weight or less, preferably 30% by weight or less, more preferably 20% by weight or less, further preferably 12% by weight or less, particularly preferably 5% by weight or less, and most preferably 2% by weight or less.

The glass transition temperature Tg of the acrylic rubber of the present embodiment is-20 ℃ or lower, preferably-22 ℃ or lower, and more preferably-25 ℃ or lower. In the present specification, the glass transition temperature Tg is a value calculated from the peak top of a differential curve, which is measured at-80 to 50 ℃ with a differential scanning calorimeter at a temperature rise rate of 10 ℃/min for an acrylic rubber. The lower limit of the glass transition temperature Tg of the acrylic rubber is not particularly limited, but is preferably-80 ℃ in view of the measurement limit.

In addition, in the acrylic rubber of the present embodiment, the volume change rate Δ V after the rubber crosslinked product of the acrylic rubber is immersed in IRM903 oil at 150 ± 2 ℃ for 72 hours is 0% or more, preferably 10% or more, more preferably 20% or more, further preferably 30% or more, and is 100% or less, preferably 90% or less, more preferably 80% or less.

In the present specification, the "volume change rate after dipping a rubber crosslinked material of acrylic rubber in 150. + -. 2 ℃ IRM903 Oil for 72 hours" is a rate (%) of volume change before and after dipping when the rubber crosslinked material of acrylic rubber is dipped in 150. + -. 2 ℃ heated test lubricating Oil No.3 Oil (trade name "IRM 903", manufactured by Japan Sun Oil Co. Ltd.) according to JIS K6258 for about 72 hours. The rubber crosslinked material of the acrylic rubber mentioned here is a crosslinked material obtained by crosslinking a composition comprising the acrylic rubber and a crosslinking agent (a rubber crosslinked material containing no filler or the like as an additive other than the crosslinking agent), and exhibits characteristics as an acrylic rubber.

In addition, in the acrylic rubber of the present embodiment, the rubber crosslinked material of the acrylic rubber is immersed in hot water at 150. + -. 2 ℃ for 96 hours, and the weight change rate Δ W after drying is-5.0% or more, preferably-4.8% or more, more preferably-4.5% or more, and 0% or less, preferably-0.5% or less, more preferably-1.0% or less.

In the present specification, "the weight change rate after the rubber crosslinked material of the acrylic rubber is immersed in hot water at 150 ± 2 ℃ for 96 hours and dried" is the ratio (%) of the weight change before and after immersion when the rubber crosslinked material of the acrylic rubber is immersed in distilled water heated at 150 ± 2 ℃ for about 96 hours and dried.

The method for producing the acrylic rubber of the present embodiment is not particularly limited, and the acrylic rubber may be produced by copolymerizing a predetermined monomer according to a known polymerization method. Specifically, the polymer can be produced by a known method such as emulsion polymerization, suspension polymerization, solution polymerization, or bulk polymerization. Among them, the emulsion polymerization method under normal pressure can be preferably used because of the easiness of controlling the polymerization reaction.

The monomer is not necessarily supplied to the reaction in all kinds and amounts at the beginning of the reaction, and may be added continuously or intermittently over the entire reaction time, or may be added all at once or in portions during the middle or latter half of the reaction time, taking into account the copolymerization reactivity, the reaction conversion rate, and the like. The ratio of each monomer to be added in the polymerization reaction needs to be adjusted depending on the reactivity of each monomer, but since the polymerization reaction proceeds almost quantitatively, it is sufficient that the ratio is consistent with the monomer unit composition of the acrylic rubber to be obtained.

The acrylic rubber of the present embodiment obtained as described above is crosslinked to obtain an acrylic rubber crosslinked product having excellent heat aging resistance, oil resistance, cold resistance, and deterioration oil resistance.

< acrylic rubber composition >

The acrylic rubber composition of the present embodiment contains an acrylic rubber and a crosslinking agent.

The acrylic rubber contained in the acrylic rubber composition of the present embodiment can be the acrylic rubber described above.

The crosslinking agent used in the present embodiment is not limited as long as it reacts with a structural unit derived from a crosslinkable monomer that functions as a crosslinking point in the acrylic rubber to form a crosslinked structure.

As the crosslinking agent, for example: polyamine compounds such as diamine compounds and carbonates thereof; a polyhydrazide compound; sulfur; a sulfur donor; a triazine thiol compound; a polyepoxide; organic carboxylic acid ammonium salts; a metal dithiocarbamate; a polycarboxylic acid; season

Salt; an imidazole compound; an isocyanuric acid compound; organic peroxides and the like. These crosslinking agents can be used alone in 1 kind or in combination of 2 or more kinds. The crosslinking agent is preferably selected appropriately according to the type of crosslinkable monomer unit.

In addition, when the crosslinkable monomer constituting the crosslinkable monomer unit of the acrylic rubber is a crosslinkable monomer containing a carboxyl group, the crosslinking agent is preferably a polyamine compound and a carbonate thereof, a guanidine compound, and a polyhydrazide compound, and more preferably a polyamine compound and a carbonate thereof.

The polyamine compound and the carbonate thereof are not particularly limited, and a polyamine compound having 4 to 30 carbon atoms and a carbonate thereof are preferable. Examples of such a polyamine compound and its carbonate include an aliphatic polyamine compound and its carbonate, and an aromatic polyamine compound and its carbonate.

Among these, the aliphatic polyamine compound and the carbonate thereof are not particularly limited, and examples thereof include hexamethylenediamine, hexamethylenediamine carbamate, N' -dicinnamylidene-1, 6-hexamethylenediamine, and carbonates thereof. Among these, hexamethylenediamine carbamate is preferred.

Further, the aromatic polyamine compound is not particularly limited, and examples thereof include 4,4 '-methylenedianiline, p-phenylenediamine, m-phenylenediamine, 4' -diaminodiphenyl ether, 3,4 '-diaminodiphenyl ether, 4' - (m-phenylenediisopropylidene) diphenylamine, 4 '- (p-phenylenediisopropylidene) diphenylamine, 2' -bis [4- (4-aminophenoxy) phenyl ] propane, 4 '-diaminobenzanilide, 4' -bis (4-aminophenoxy) biphenyl, m-xylylenediamine, p-xylylenediamine, 1,3, 5-benzenetriamine, and the like. Among these, 2' -bis [4- (4-aminophenoxy) phenyl ] propane is preferred.

In addition, in the case where the crosslinkable monomer constituting the crosslinkable monomer unit is a crosslinkable monomer containing an epoxy group, the crosslinking agent can be used: hexamethylenediamine, hexamethylenediamine carbamate, aliphatic polyamine compounds and carbonates thereof; aromatic polyamine compounds such as 4, 4' -methylenedianiline; ammonium carboxylates such as ammonium benzoate and ammonium adipate; dithiocarbamic acid compounds such as dimethyldithiocarbamic acid and zinc dimethyldithiocarbamate; polycarboxylic acids such as tetradecanedioic acid; quaternary ammonium cetyltrimethyl bromide and the like

Salt; imidazole compounds such as 2-methylimidazole; isocyanuric acid compounds such as isocyanuric acid and ammonium isocyanurates. Among these, ammonium benzoate, dimethyldithiocarbamate and isocyanuric acid are preferable.

When the crosslinkable monomer constituting the crosslinkable monomer unit is a crosslinkable monomer containing a halogen group, trithiocyanuric acid, triazine thiol derivatives such as 1,3, 5-triazine trithiol, 2,4, 6-trithiol-s-triazine, ammonium salts of organic carboxylic acids such as ammonium adipate, mixtures of metal soaps and sulfur, dipentamethylenethiuram hexasulfide, triethylthiuram disulfide and the like can be used as the crosslinking agent. Among these, a mixture of 1,3, 5-triazinetrithiol, metal soap and sulfur is preferable.

The content of the crosslinking agent in the acrylic rubber composition of the present embodiment is preferably 0.05 parts by weight or more, more preferably 0.1 parts by weight or more, and further preferably 0.2 parts by weight or more, and preferably 10 parts by weight or less, and more preferably 5 parts by weight or less, based on 100 parts by weight of the acrylic rubber in the acrylic rubber composition. When the content of the crosslinking agent is too small, crosslinking is insufficient, and the shape of the crosslinked acrylic rubber is difficult to maintain. On the other hand, when the content of the crosslinking agent is too large, the acrylic rubber crosslinked material becomes too hard, and the elasticity is impaired.

The acrylic rubber composition of the present embodiment may contain a crosslinking accelerator in addition to the crosslinking agent. The crosslinking accelerator is not particularly limited as long as it accelerates crosslinking by combining with a crosslinking agent.

Examples of the crosslinking accelerator include aliphatic secondary monoamine compounds, aliphatic tertiary monoamine compounds, guanidine compounds such as 1, 3-diorthotolylguanidine, dithiocarbamic acids such as zinc dibutyldithiocarbamate, zinc salts thereof, thiourea compounds such as diethylthiourea, imidazole compounds, and quaternary phosphonium compounds

Salts, tertiary phosphine compounds, alkali metal salts of weak acids, and diazabicycloalkene compounds, and the like. These crosslinking accelerators may be used alone in 1 kind or in combination in 2 or more kinds.

The amount of the crosslinking accelerator used is preferably 0.1 part by weight or more, more preferably 0.2 part by weight or more, and further preferably 0.5 part by weight or more, and preferably 10 parts by weight or less, more preferably 7.5 parts by weight or less, and further preferably 5 parts by weight or less, based on 100 parts by weight of the acrylic rubber in the acrylic rubber composition. When the crosslinking accelerator is too large, the crosslinking speed at the time of crosslinking becomes too high, blooming (bloom) of the crosslinking accelerator occurs on the surface of the crosslinked product, and the crosslinked product becomes too hard. When the crosslinking accelerator is too small, the crosslinking rate becomes too slow, and the tensile strength of the crosslinked product is remarkably lowered.

In addition to the above components, the acrylic rubber composition of the present embodiment can be added with a required amount of additives such as a crosslinking activator, a filler, a lubricant, an antioxidant, a scorch retarder, a processing oil, and a plasticizer, which are additives generally used in the acrylic rubber field.

The filler is not particularly limited, and a carbon-based material such as carbon black or Graphite (Graphite) can be used. Among them, carbon black is preferably used. Specific examples of the carbon black include furnace black, acetylene black, thermal black, and channel black. Among these, furnace black is preferably used, and specific examples thereof include SAF, ISAF-HS, ISAF-LS, IISAF-HS, HAF-HS, HAF-LS, MAF, FEF and the like, and FEF, MAF and HAF-HS are particularly preferable. Specific examples of the graphite include: natural graphite such as flake graphite and flaky graphite; artificial graphite. The carbon-based materials can be used singly or in combination of 2 or more. The amount of the filler added is preferably 40 to 90 parts by weight based on 100 parts by weight of the acrylic rubber in the acrylic rubber composition.

Examples of the filler other than the carbon-based material include: metal powders such as aluminum powder; inorganic powders such as hard clay, talc, calcium carbonate, titanium oxide, calcium sulfate, calcium carbonate, and aluminum hydroxide; organic powders such as starch and polystyrene powder; short fibers such as glass fibers (milled fibers), carbon fibers, aramid fibers, and potassium titanate whiskers; silica, mica, and the like. These fillers may be used alone or in combination of 2 or more.

Examples of the lubricant include hydrocarbon-based waxes, fatty acid amide-based waxes, fatty acid ester waxes, fatty alcohol-based waxes, partial ester waxes of fatty acids and polyhydric alcohols, silicone oils, polyorganosiloxanes, distearyl hexa-hydroxy phthalate, sodium alkyl sulfates, long-chain aliphatic compounds, nonionic ester activators, block copolymers of ethylene oxide and propylene oxide, and tetrafluoroethylene resin powders. These lubricating materials may be used alone in 1 kind, or may be used in combination in 2 or more kinds.

As the antioxidant, phenol-based, amine-based, phosphoric-acid-based, sulfur-based ones and the like can be used. Typical examples of the phenol-based compound include 2, 2-methylenebis (4-methyl-6-tert-butylphenol) and typical examples of the amine-based compound include 4, 4' -bis (. alpha.,. alpha. -dimethylbenzyl) diphenylamine. These antioxidants may be used alone in 1 kind, or may be used in combination in 2 or more kinds.

The scorch retarder is not particularly limited, and examples thereof include: organic acid-based scorch retarders such as phthalic anhydride, benzoic acid, salicylic acid, and malic acid; a nitroso compound-based scorch retarder such as N-nitrosodiphenylamine; thiophthalimide-based scorch retarders such as N- (cyclohexylthio) phthalimide; a sulfonamide derivative; 2-mercaptobenzimidazole; trichloromelamine; stearylamine and the like. The scorch retarder may be used alone in 1 kind, or may be used in combination in 2 or more kinds.

Further, a polymer such as a rubber, an elastomer, or a resin other than the acrylic rubber of the present embodiment may be added to the acrylic rubber composition of the present embodiment as needed. The content of the polymer such as a rubber, an elastomer, or a resin other than the acrylic rubber is preferably 100 parts by weight or less, more preferably 50 parts by weight or less, and still more preferably 20 parts by weight or less, based on 100 parts by weight of the acrylic rubber in the acrylic rubber composition.

Examples of the rubber other than the acrylic rubber include Natural Rubber (NR), Isoprene Rubber (IR), solution SBR (solution styrene butadiene rubber), emulsion SBR (emulsion styrene butadiene rubber), low cis BR (butadiene rubber), high cis BR, high trans BR (trans bond content of butadiene part 70 to 95%), styrene-isoprene copolymer rubber, butadiene-isoprene copolymer rubber, ethylene propylene diene rubber (EPDM), emulsion styrene-acrylonitrile-butadiene copolymer rubber, polyisoprene-SBR block copolymer rubber, polystyrene-polybutadiene-polystyrene block copolymer, acrylic rubber other than the above-mentioned acrylic rubber, epichlorohydrin rubber, rubber, Fluororubbers, silicone rubbers, ethylene-propylene rubbers, urethane rubbers, and the like.

Examples of the elastomer include olefin elastomers, styrene elastomers, polyester elastomers, polyamide elastomers, polyurethane elastomers, and polysiloxane elastomers.

Examples of the resin include olefin resins, styrene resins, acrylic resins, polyphenylene ethers, polyesters, polycarbonates, and polyamides.

As a method for producing the acrylic rubber composition of the present embodiment, a mixing method such as roll mixing, banbury mixing, screw mixing, solution mixing, or the like can be suitably employed. The order of addition is not particularly limited, and after components which are not easily reacted or decomposed by heat are sufficiently mixed, components which are easily reacted or components which are easily decomposed by heat (for example, a crosslinking agent, a crosslinking accelerator, and the like) may be mixed in a short time at a temperature at which reaction or decomposition does not occur.

The acrylic rubber composition of the present embodiment obtained as described above can be crosslinked to obtain an acrylic rubber crosslinked product having excellent heat aging resistance, oil resistance, cold resistance, and deterioration oil resistance.

< crosslinked acrylic rubber >

The acrylic rubber crosslinked product of the present embodiment is obtained by crosslinking the above-described acrylic rubber composition.

Crosslinking is performed by heating the acrylic rubber composition. The crosslinking temperature under the crosslinking conditions is preferably 130 ℃ or higher, more preferably 140 ℃ or higher, preferably 220 ℃ or lower, and more preferably 200 ℃ or lower. The crosslinking time is preferably 30 seconds or more, more preferably 1 minute or more, preferably 2 hours or less, and more preferably 1 hour or less. This stage 1 crosslinking is also referred to as primary crosslinking.

As a method for molding the acrylic rubber crosslinked product to obtain a desired shape, conventionally known molding methods such as extrusion molding, injection molding, transfer molding, compression molding, and the like can be used. In addition, the crosslinking can be performed by heating at the same time as molding.

Extrusion molding can employ the usual rubber processing steps. For example, a rubber composition prepared by roll mixing or the like is supplied to a feed port of an extruder, softened by heating from a drum while being fed to a head by a screw, and passed through a die of a predetermined shape provided in the head, whereby an elongated extrusion molded article (a plate, a rod, a tube, a hose, a profile, or the like) having a desired cross-sectional shape can be obtained.

The method for producing the extrusion molded article itself is not particularly limited, and a known production method may be used. The structure of the extrusion-molded article is not particularly limited, and examples thereof include fiber coatings, tape cores, and laminates with other rubbers or resins. The extrusion molded article molded into a desired shape is crosslinked. The crosslinking of the extrusion-molded article can be obtained by molding the extrusion-molded article into a predetermined shape and then performing primary crosslinking in a steam pot. Further, if necessary, the secondary crosslinking may be carried out under hot air in an oven.

In injection molding, transfer molding, and compression molding, the acrylic rubber composition of the present embodiment can be filled into a cavity of a mold having a shape of 1 or several products for shaping. In this case, crosslinking may be performed after the preliminary molding or simultaneously with the molding.

The molding temperature is usually 10 to 200 ℃ or higher, preferably 25 ℃ or higher, usually 200 ℃ or lower, preferably 120 ℃ or lower. The crosslinking temperature is usually 130 ℃ or higher, preferably 150 ℃ or higher, usually 220 ℃ or lower, preferably 190 ℃ or lower. The crosslinking time is usually 2 minutes or more, preferably 3 minutes or more, and usually 10 hours or less, preferably 5 hours or less. As a heating method, a method which can be used for crosslinking the rubber, such as press heating, steam heating, oven heating, and hot air heating, may be appropriately selected.

The rubber crosslinked material of the present embodiment may be further heated to be secondarily crosslinked, depending on the shape, size, and the like of the rubber crosslinked material. The secondary crosslinking is carried out for 1 to 48 hours, depending on the heating method, crosslinking temperature, shape, and the like. The heating method and the heating temperature can be properly selected.

The crosslinked rubber product of the present embodiment can maintain tensile strength, elongation, hardness, and the like, which are basic properties of rubber, and is excellent in heat aging resistance, oil resistance, cold resistance, and deterioration oil resistance. Therefore, the crosslinked rubber of the present embodiment can be preferably used in a wide range of fields such as transportation equipment such as automobiles, general equipment, and electric equipment, taking advantage of such characteristics: sealing materials such as O-rings, gaskets, oil seals, bearing seals, cylinder head liners, plug tube liners, camshaft journal bore liners, cylinder head liners, engine head liners, slide valve liners, oil pressure sensor liners, camshaft thrust liners, oil filter liners, oil cooler liners, oil pan liners, oil filter cartridge liners, oil conduit nozzle liners, oil filter base liners, oil level conduit liners, oil pump liners, chain case liners, transmission seal liners, crankshaft seal liners, cam seal liners, valve stem seal liners, baffle liners, valve timing control valve liners, access cover bolt liners, lower cylinder throttle liners, power steering seal tape cover seals, crankcase vent valve liners, and CVJ (constant velocity universal joint) and R & P (rack and pinion) dust cover materials; cushioning materials, vibration-proof materials; an electric wire covering material; industrial belts; tubes and hoses such as an oil cooler hose, an oil cooling hose, a turbo charge intercooler hose, a turbo charge air conduit hose, a power steering hose, a hot air hose, a radiator hose, a power steering hose, a diesel turbo charger hose, an oil system hose including a high-pressure system of other industrial machinery and construction machinery, a fuel system hose, and a drainage system hose; seals, and the like. Among these, the resin composition can be suitably used for sealing materials and hose materials.