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US 4,397,975 AGranted
Heat stabilized polymers
AssigneeMonsanto Company
InventorAlva F. Harris
Life of this patent
Estimating the term…
Abstract
The tendency to crosslink of polymer compositions comprising polymer units derived from acrylonitrile and maleic anhydride is controlled by the use of a sulfur acid.
Claims4
A polymeric composition having a reduced tendency to crosslink during fabrication, which composition comprises a polyblend of (a) a styrene maleic/anhydride polymer containing 50 to 83% by weight of styrene, from 10 to 35% by weight of maleic anhydride and from 0 to 20% by weight of methyl methacrylate;
- (b) a polymer selected from the group consisting of acrylonitrile-butadiene-styrene polymers having an acrylonitrile content of at least 8% by weight and styrene-acrylonitrile polymers having an acrylonitrile content from 20 to 70% by weight;
- and (c) an effective amount from about 0.001 to 0.005 mole per 100 gm of polymer, of a sulfur acid.
Dependencies are inferred from the claim text.