Ube Industries, Inc.

Jiro Hiromoto

Michinori Suzuki

Nobuhiro Tsujimoto

An N-(hydroxyphenyl)maleimide-isobutylene copolymer having the following repeating units: ##STR1## wherein R.sup.3 is a halogen atom or a lower alkyl group having 1-5 carbon atoms; l, m and n are numbers satisfying conditions of 0.01&lt;n/(l+m).ltoreq.10 and 0.2&lt;l/(l+m).ltoreq.1; and p is an integer of 0-4.

N-chydroxyphenyl)maleimide-isobutylene copolymer

A process for the preparation of an N-(hydroxyphenyl)-5 maleimide copolymer having the following repeating units: ##STR1## wherein R.sup.1 is hydrogen, an aryl group, an alkyl group having 1-16 carbon atoms or a cycloalkyl group; R.sup.2 is hydrogen or a lower alkyl group having 1-5 carbon atoms; R.sup.3 is a halogen atom or a lower alkyl group having 1-5 carbon atoms; l, m and n are numbers satisfying conditions of 0.01&lt;n/(l+m).ltoreq.10 and 0.1&lt;l/(l+m).ltoreq.1; and p is an integer of 0-4, comprising reaction of a copolymer of maleic anhydride and an unsaturated hydrocarbon and an aminophenol in an organic solvent.

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Ichihara, Japan

Jiro Hiromoto