Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Composite article making
Patent
1981-08-10
1984-08-07
Anderson, Philip E.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Composite article making
264455, 264 54, 2643286, 264DIG5, 521 90, 521 99, 521128, B29D 2700
Patent
active
044643209
ABSTRACT:
A method of forming reinforced synthetic articles of polyester resin by reaction injection molding techniques comprising combining a set of reactants including a major base mass of polyester resin in fluid form, at least one polyester cure accelerator, a selected quantity of isocyanate, a surfactant, and an additive that is highly exothermically reactive with at least one other component in the mixture. The isocyanate is added in sufficient quantity to react with at least one other component in the mixture to provide mold filling and shrink-resistant quantities of carbon dioxide throughout the mixture. The resultant mixture is injected into a mold prior to substantial reaction. The additive is allowed to react and the heat produced by this exothermic reaction is effective to trigger and accelerate gas forming soon after injection. The gas formation generates pressure to expand the polyester base resin mass and maintain pressure through the curing reaction of the accelerator with the polyester resin.
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Anderson Philip E.
Whitney & Company, Inc.
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