Copolymers based on long-chain olefins and ethylenically unsaturated dicarboxylic anhydrides for rendering leathers and skins water-repellent
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United States of America Patent
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Jan 18, 1994
Issued Date -
N/A
app pub date -
Feb 5, 1992
filing date -
Aug 8, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Copolymers which are obtainable by free radical copolymerization of (a) C.sub.8 --C.sub.40 -monoolefins with (b) ethylenically unsaturated C.sub.4 -C.sub.8 -dicarboxylic anhydrides by mass polymerization at from 80.degree. to 300.degree. C. to give copolymers having molecular weights of from 500 to 20,000 g/mol, subsequent solvolysis of the anhydride groups of the copolymers and partial or complete neutralization of the carboxyl groups formed during the solvolysis, in an aqueous medium by means of a base, and which are present in the form of aqueous dispersions or solutions, are used as agents for rendering leathers and skins water-repellent.
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