Nippon Mektron Limited

Kuniyoshi Saito

Jun Okabe

Iwao Moriyama

Eiji Komiya

Yoshihiro Kuzumaki

Eiji Komiyama

A modified acrylic rubber having distinguished molding characteristics and O-ring compression set characteristic is produced by mixing an acrylic rubber having reactive functional groups such as active chlorine groups, carboxylic groups, epoxy groups, active ester groups, etc. with an unsaturated compound reactive with the reactive functional group with heating in the absence of a solvent.

Process for producing modified acrylic rubber

An acrylic elastomer obtained by copolymerization of about 60 to about 99.9% by weight of at least one of alkyl acrylate and alkoxyalkyl acrylate; about 10 to about 0.1% by weight of a halogen-containing vinyl compound having a secondary or tertiary halogenoalkyl group; and about 30 to 0% by weight of a monomer copolymerizable with the acrylate and the vinyl compound, sum total being 100% by weight, is an acrylic elastomer containing the halogen-containing vinyl compound as a cross-linking site monomer capable of forming an active halogen group cross-linkable with an organic peroxide or the like, and has a high vulcanization torque.

Vulcanizable acrylic elastomer composition including an acrylic

A copolymer comprising an alkyl acrylate and an unsaturated ester compound represented by the following general formula:

Acrylic copolymer elastomer, its blend rubber and blend rubber

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.

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.

Process for producing rubber compound

A copolymer comprising an alkyl acrylate and an. unsaturated ester compound represented by the following general formula:

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Iwaki, Japan

Kuniyoshi Saito