Abstract: An acrylic rubber that is a copolymer in which 1 to 4 wt. % of a reactive halogen group-containing vinyl monomer is copolymerized as a crosslinkable comonomer, wherein 45 to 65 wt. % of n-butyl acrylate, 10 to 35 wt. % of 2-methoxyethyl acrylate and 8 to 30 wt. % of ethoxyethoxyethyl acrylate are copolymerized in 100 wt. % of comonomers other than the crosslinkable comonomer. This ethoxyethoxyethyl acrylate-copolymerized acrylic rubber can suppress the reduction of oil resistance while improving cold resistance represented by a TR-10 value, and by compounding it with a vulcanizing agent corresponding to the crosslinkable group thereof, a crosslinkable composition is formed.

Abstract: An acrylic rubber that is a copolymer in which 1 to 4 wt. % of a reactive halogen group-containing vinyl monomer is copolymerized as a crosslinkable comonomer, wherein 45 to 65 wt. % of n-butyl acrylate, 10 to 35 wt. % of 2-methoxyethyl acrylate and 8 to 30 wt. % of ethoxyethoxyethyl acrylate are copolymerized in 100 wt. % of comonomers other than the crosslinkable comonomer. This ethoxyethoxyethyl acrylate-copolymerized acrylic rubber can suppress the reduction of oil resistance while improving cold resistance represented by a TR-10 value, and by compounding it with a vulcanizing agent corresponding to the crosslinkable group thereof, a crosslinkable composition is formed.

Abstract: A butenedioic acid monoalkyl ester-copolymerized acrylic elastomer containing 0.1-30% by mole of unreacted butenedioic acid monoalkyl ester on the basis of carboxyl groups copolymerized in the acrylic elastomer or its cross-linkable composition. The cross-linkable composition can give cross-linking products having distinguished vulcanization characteristics and stably showing good compression set characteristics.

Abstract: A butenedioic acid monoalkyl ester-copolymerized acrylic elastomer containing 0.1-30% by mole of unreacted butenedioic acid monoalkyl ester on the basis of carboxyl groups copolymerized in the acrylic elastomer or its cross-linkable composition. The cross-linkable composition can give cross-linking products having distinguished vulcanization characteristics and stably showing good compression set characteristics.

Abstract: A butenedioic acid monoalkyl ester-copolymerized acrylic elastomer containing 0.1-30% by mole of unreacted butenedioic acid monoalkyl ester on the basis of carboxyl groups copolymerized in the acrylic elastomer or its cross-linkable composition. The cross-linkable composition can give cross-linking products having distinguished vulcanization characteristics and stably showing good compression set characteristics.

Abstract: An acrylic elastomer composition comprising a carboxyl group-containing acrylic elastomer and a mercaptobenzimidazole gives sealing materials, etc. having improved compression set characteristics, where a vulcanizing agent-vulcanization accelerater combination such as (1) polyfunctional isocyanate compound and at least one of a guanidine, a quaternary onium salt, a tertiary amine and a tertiary phosphine, and (2) a diamine compound and at least one of a guanidine, 1,8-diazabicyclo[5,4,0]-undecene-7, 1,5-diazabicyclo[4,3,0]nonene-5 and their salts is used as a vulcanization system for the composition.

Abstract: A butenedioic acid monoalkyl ester-copolymerized acrylic elastomer containing 0.1-30% by mole of unreacted butenedioic acid monoalkyl ester on the basis of carboxyl groups copolymerized in the acrylic elastomer or its cross-linkable composition. The cross-linkable composition can give cross-linking products having distinguished vulcanization characteristics and stably showing good compression set characteristics.

Abstract: An acrylic elastomer composition, which comprises an acrylic elastomer obtained by copolymerization with 0.1 to 10% by weight of fumaric acid mono-lower alkyl ester on the basis of total monomer mixture, an aromatic diamine compound vulcanizing agent and a guanidine compound vulcanization promoter is distinguished in metal corrosion resistance, oil resistance, compression set characteristics, etc. and is effectively applicable as a vulcanization molding material for seal members or hose members to be used at contact sites with metal members, oil, etc.

Abstract: An acrylic elastomer composition, which comprises a carboxyl group-containing acrylic elastomer, a polyfunctional isocyanate compound or a blocked isocyanate, and at least one of a guanidine, a quaternary onium salt, a tertiary amine and a tertiary phosphine has an improved scorch resistance without lowering the normal state physical properties, heat resistance and compression set characteristics of the resulting vulcanization products, when the polyfunctional isocyanate used, or has an improved scorch resistance, particulary at high temperatures, without lowering the vulcanization speed when the blocked isocyanate is used.

Abstract: A copolymer comprising an alkyl acrylate and an unsaturated ester compound represented by the following general formula:CH.sub.2 .dbd.CRCOO(CH.sub.2)nPhOR', (1)CH.sub.2 .dbd.CRCOO(CH.sub.2)nOCO(CH.sub.2)mPhOR', (2)CH.sub.2 .dbd.CHOCO(CH.sub.2)nOCO(CH.sub.2)mPhOR', (3)CH.sub.2 .dbd.CHO(CH.sub.2)nOCO(CH.sub.2)mPhOR' or (4)CH.sub.2 .dbd.CHPh(CH.sub.2)nOCO(CH.sub.2)mPhOR' (5)where R is a hydrogen atom or a methyl group; R' is a hydrogen atom, an acyl group or a trialkylsilyl group; and Ph is a phenylene group, forms a blend rubber having a good heat resistance and a good amine resistance with a fluorine-containing elastomer.

Abstract: A novel acrylic copolymer elastomer comprising ?I! an alkyl acrylate; ?II! (a) CH.sub.a .dbd.CRCOOR.sub.2 OCOR.sub.1, (b) CH.sub.2 .dbd.CRCO?O(CH.sub.2) pCO!qOR.sub.1 or (c) CH.sub.2 .dbd.CRCOOR.sub.2 ?CO(CH.sub.2)pO!qCOR.sub.1 ; and ?III! (1) CH.sub.2 .dbd.CRCOO(CH.sub.2)nPhOR', (2) CH.sub.2 .dbd.CRCOO(CH.sub.2)nOCO(CH.sub.2)mPhOR', (3) CH.sub.2 .dbd.CHOCO(CH.sub.2)mPhOR', (4) CH.sub.2 .dbd.CHOCO(CH.sub.2)nOCO(CH.sub.2)mPhOR', (5) CH.sub.2 .dbd.CHO(CH.sub.2)nOCO(CH.sub.2)mPhOR' or (6) CH.sub.2 .dbd.CHPh(CH.sub.2)nOCO(CH.sub.2)mPhOR' where R is a hydrogen atom or a methyl group, R.sub.1 is an alkyl group, R.sub.2 is an alkylene group, R' is a hydrogen atom, an acyl group or a trialkylsilyl group and Ph is a phenylene group, provides a blend rubber having an improved cold resistance and an intermediate heat resistance between the heat resistance of acrylic copolymer elastomer and that of fluorine-containing elastomer, when blended with the fluorine-containing elastomer.

Abstract: A rubber compound comprising a fluorine rubber component and an acrylic rubber component is produced by adding an acrylic monomer to an aqueous emulsion of fluorine-containing elastomer obtained by emulsion polymerization, using a fluorine-containing surfactant, followed by radical polymerization reaction. The obtained rubber compound can satify both of vulcanization moldability and heat aging resistance, and is at a lower cost than the expensive fluorine rubber.

Abstract: A copolymer comprising an alkyl acrylate and an. unsaturated ester compound represented by the following general formula:(1) CH.sub.2 .dbd.CRCOO(CH.sub.2)nPhOR',(2) CH.sub.2 .dbd.CRCOO(CH.sub.2)nOCO(CH.sub.2)mPhOR',(3) CH.sub.2 .dbd.CHOCO(CH.sub.2)nOCO(CH.sub.2)mPhOR',(4) CH.sub.2 .dbd.CHO(CH.sub.2)nOCO(CH.sub.2)mPhOR' or(5) CH.sub.2 .dbd.CHPh(CH.sub.2)nOCO(CH.sub.2)mPhOR'where R is a hydrogen atom or a methyl group; R' is a hydrogen atom, an acyl group or a trialkylsilyl group; and Ph is a phenylene group, forms a blend rubber having a good heat resistance and a good amine resistance with a fluorine-containing elastomer.