Process for producing acrylic rubber by copolymerizing acrylic ester and malonic acid derivative having active methylene group
AssigneeToyo Seal Kogyo Kabushiki Kaisha (Toyo Seal Industries Co., Ltd.)
InventorMichinori Kuraya
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Abstract
A process for producing acrylic rubber vulcanizable with curing agents in e thiuram series is provided. The process includes the copolymerization of an acrylic ester or esters with a malonic acid derivative having an active methylene group of the formula ##STR1## wherein R.sub.1 represents vinyl, allyl or methallyl, and X represents cyano or COOR.sub.2 in which R.sub.2 represents methyl, ethyl or propyl. The acrylic rubber thus produced shows better physical properties than the conventional one.
Claims9
A process for producing vulcanized acrylic rubber which comprises (1) copolymerizing (A) at least one acrylic ester selected from the group consisting of .beta.-methoxyethylacrylate, .beta.-ethoxyethylacrylate and an ester of acrylic acid with an alkyl alcohol with (B) 2-10% by weight, based on the weight of the acrylic ester component, of a malonic acid derivative having an active methylene group of the formula ##STR5## wherein R.sub.1 represents vinyl, allyl or methallyl, and X represents cyano or COOR.sub.2 in which R.sub.2 represents methyl, ethyl or propyl, in an aqueous medium and in the presence of a copolymerization catalyst at a temperature of 5.degree.-95.degree. C. for 30-120 minutes, the acrylic ester component being added to the copolymerization system in a dropwise manner, and (2) vulcanizing the resultant copolymer with a vulcanizing agent of the thiuram series.
Dependencies are inferred from the claim text.