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US 3,941,857 AGranted
Polyvinylchloride/olefin copolymers stabilized with epoxy resin
AssigneeE. I. Du Pont de Nemours and Company
InventorSouheng Wu
Life of this patent
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Abstract
A composition comprising a vinylchloride/olefin copolymer and a small amount of an epoxy resin is provided. The epoxy resin reacts with residual surfactants in the copolymer on heating. Coatings of the composition have satisfactory hot water resistance. Coatings prepared from the copolymer without epoxy resin have inconsistant performance as to hot water resistance with a substantial tendency toward pitting as shown by "blushing."
Claims8
A composition comprising
- A. 98-99.5% by weight, based on the weight of (A) plus (B), of a copolymer of film-forming molecular weight, prepared with and containing 0.01-0.5%, based on the weight of (A), of an epoxy reactive surfactant having at least one functional group selected from the group consisting of hydroxyl, carboxyl, amino, and sulfato, said copolymer comprising about 90 to 98% by weight vinyl chloride and about 2 to 10% by weight of ethylene or propylene;
- and
- B. 0.5-2% by weight, based on the weight of (A) plus (B), of an epoxy resin having greater than 1 and no more than 3 equivalents of oxirane per molecule with an equivalent weight of between 150 and 6,000.
Dependencies are inferred from the claim text.