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US 5,401,803 AGranted
Ethylene-vinyl acetate copolymer additives for molding compositions
AssigneeUnion Carbide Chemicals & Plastics Technology Corporation
InventorGary C. Rex
Life of this patent
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Abstract
Additive compositions comprising ethylene-vinyl acetate copolymers suitable for use in molding compositions are disclosed. The ethylene-vinyl acetate copolymers have a low degree of crystallinity which can provide a desirable balance of pigmentability, shrinkage resistance and solubility in styrene when used in molding compositions containing the ethylene-vinyl acetate copolymers.
Claims11
In a molding composition comprising;
- (a) from about 20 to 60 weight percent of an unsaturated resin;
- (b) from about 5 to 60 weight percent of an olefinically unsaturated monomer copolymerizable with the unsaturated resin;
- and
- (c) from about 1 to 40 weight percent of an ethylene-vinyl acetate copolymer;
- said percentages based on the total weight of the unsaturated resin, the monomer and the ethylene-vinyl acetate copolymer:
- the improvement wherein the ethylene-vinyl acetate copolymer;
- (i) comprises from about 40 to 50 weight percent of vinyl acetate, based on the weight of the ethylene-vinyl acetate copolymer, and
- (ii) has a Branching Content of at least about 15.
5 more elements
In a molding composition comprising;
- (a) from about 20 to 60 weight percent of an unsaturated polyester resin;
- (b) from about 5 to 60 weight percent of styrene;
- and
- (c) from about 1 to 40 weight percent of an ethylene-vinyl acetate copolymer;
- said percentages based on the total weight of the unsaturated polyester resin, the styrene and the ethylene-vinyl acetate copolymer:
- the improvement wherein the ethylene-vinyl acetate copolymer;
- (i) comprises from about 40 to 50 weight percent of vinyl acetate, based on the weight of the ethylene-vinyl acetate copolymer, and
- (ii) has a Branching Content of at least about 15.
5 more elements
Dependencies are inferred from the claim text.