Foamed polyester resin
AssigneeVast Products Inc.
InventorWilliam F. Brown
Life of this patent
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Abstract
A method of preparing lightweight molded objects having high structural strength and uniform closed cell structure comprises forming a uniform mixture of a liquid general purpose polyester resin, an inorganic filler or a mixture thereof, bicarbonate of soda, sodium acetate, aluminum ammonium sulfate, ferrous ammonium sulfate and tannic acid and a catalyst mixture containing a peroxide catalyst for the polyester resin, an acidic substance to release the carbon dioxide gas from the bicarbonate of soda and water. The resin mixture and the catalyst mixture are uniformly blended and applied to the mold or cavity and the foamed polyester allowed to form.
Claims8
The method of preparing objects of a foamed-filled polyester resin material which comprises (a) preparing a liquid resin blend comprised of a liquid polyester resin, an inorganic filler, bicarbonate of soda, and an effective amount of a cell stabilizing mixture containing sodium acetate, aluminum ammonium sulfate, ferrous ammonium sulfate and tannic acid;
- (b) preparing a catalyst blend comprised of an effective amount of an organic peroxide catalyst for the polyester resin, an acidic substance effective to release carbon dioxide from the bicarbonate of soda, and water;
- (c) combining the resin blend and the catalyst blend to form a uniform liquid mixture;
- and (d) applying that mixture to a mold or surface and allowing the mixture to foam.
Dependencies are inferred from the claim text.