Pigmentable low-profile polyester molding compositions
AssigneeHooker Chemicals & Plastics Corporation
InventorDonald H. Thorpe
Life of this patent
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Abstract
Polymerizable molding compositions having excellent pigmentability and dimensional stability comprise: A. polymerizable polyester component and B. an additive component comprising discrete particles of less than about 50 microns diameter of a cross-linked acrylate polymer having a glass transition temperature of below about 75.degree. Celsius and which is chemically inert with respect to the polyester component and is swellable but insoluble therein. The additive component comprises the lightly cross-linked reaction product of at least one monofunctional acrylate monomer and at least one polyfunctional acrylate monomer.
Claims18
A molding composition comprising
- A. a polymerizable unsaturated polyester;
- and
- B. an additive component, present in an amount of about 5 to about 45 parts by weight per 100 parts by weight of polyester component, comprising discrete particles of less than about 50 microns diameter of a cross-linked acrylate polymer characterized by a glass transition temperature of less than about 75.degree. Celsius and which is chemically inert with respect to said polyester component and is swellable but insoluble therein, said acrylate polymer consisting essentially of the reaction product of about 75 to about 95 percent by weight of at least one monoacrylate monomer and about 5 to about 25 percent by weight of at least one polyacrylate monomer.
A low profile additive for molding compositions which comprises discrete particles of less than about 50 microns diameter of a cross-linked acrylate polymer characterized by a glass transition temperature of less than about 75.degree. Celsius and which is the reaction product of about 75 to about 95 percent by weight of at least one monoacrylate monomer and about 5 to about 25 percent by weight of at least one acrylate polyacrylate monomer.
Dependencies are inferred from the claim text.