Low profile polyester molding composition
AssigneeHooker Chemicals & Plastics Corporation
InventorsVictor F. G. Cooke, Donald H. Thorpe
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Abstract
Dimensionally stable, pigmentable polyester molding compositions comprise: (A) a polymerizable polyester component; and (B) an additive component comprising discrete particles of less than about 50 microns diameter of a lightly cross-linked styrene terpolymer having a glass transition temperature of below about 100.degree. Celsius and which is chemically inert with respect to the polyester component and is swellable but insoluble therein. The additive component is the reaction product of styrene, an unsaturated monofunctional comonomer and a polyfunctional monomer such as divinyl benzene.
Claims7
A low profile additive for molding compositions comprising discrete particles of less than about 50 microns diameter of a cross-linked styrene terpolymer characterized by a glass transition temperature of less than about 100.degree. Celsius and consisting essentially of the reaction product of about 20 to about 60 weight percent styrene, about 25 to about 75 weight percent of at least one monounsaturated acrylate or methacrylate comonomer which has a glass transition temperature of below about 0.degree. Celsius when hemopolymerized and which is selected from the group consisting of ethyl acrylate, isopropyl acrylate, n-butyl acrylate, isobutyl acrylate, s-butyl acrylate, 2-ethyl hexyl acrylate, n-hexyl methacrylate, n-octyl methacrylate, isodecyl methacrylate, tridecyl methacrylate, and mixtures thereof, and about 2 to about 25 weight percent of at least one polyunsaturated monomer.
Dependencies are inferred from the claim text.