Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Composite article making
Patent
1981-08-10
1983-09-20
Anderson, Philip E.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Composite article making
264 467, 264 54, 264DIG5, 264DIG83, 4283044, 521 94, 521 96, 521 99, 521122, 521128, 521137, B29D 2700
Patent
active
044055382
ABSTRACT:
A method of forming synthetic articles of polyester resin by resin transfer molding techniques or the like 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 at least one promoter. The isocyanate is added in sufficient quantity to react with at least one other component in the mixture to produce quantities of carbon dioxide throughout the mixture. The resultant mixture is transferred into a closed mold prior to substantial reaction. The promoter is allowed to react exothermically with at least one other component of the mixture to trigger the isocyanate to react to evolve carbon dioxide gas to generate pressure to fill the mold. Thereafter a curing reaction between the cure accelerator and the polyester occurs to cure and solidify the expanded resin to produce an expanded article. Preferably reinforcement is placed within the mold prior to filling, the expansion of the mixture is effective to bring the fluid resin into pressured wetting contact with substantial regions of the surface of the reinforcement to incorporate the element within the resin by self working or gradual flow within the closed mold, and curing the expanded resin produces a reinforced expanded article.
REFERENCES:
patent: 3823099 (1974-07-01), Doyle
patent: 3970732 (1976-07-01), Slaats et al.
patent: 4073840 (1978-02-01), Saidla
patent: 4211848 (1980-07-01), Blount
patent: 4216294 (1980-08-01), Halle et al.
patent: 4308226 (1981-12-01), Wingard
patent: 4314036 (1982-02-01), Throne et al.
Anderson Philip E.
Whitney & Company, Inc.
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