Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By gas forming or expanding
Patent
1988-01-12
1991-07-02
Theisen, Mary Lynn
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By gas forming or expanding
264338, B28B 738
Patent
active
050283669
ABSTRACT:
A method for preparing a polyurethane foam article in a mold by applying to a mold surface a water-based mold release composition which includes a release effective system which is in a solid (hardened) state at the mold pour temperature and a liquid state at the demold temperature, pouring a polyurethane foam composition into the mold, curing the foam composition and demolding the foam article. The use of such release effective system in the aqueous mold release composition provides for a reduction in surface defects of the polyurethane foam article.
Also disclosed is the incorporation of a poly(siloxane-glycol) surfactant having a cloud point ranging from 25.degree.-50.degree. C. into a water-based mold release composition including an aqueous emulsion or dispersion of at least one release effective substance and desirably at least one emulsifying agent provides for improved surface quality of the foam product.
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Andrew Gary D.
Harakal Mark E.
Makus Zdizslaw
Scarpati Michael
Wasilczyk George J.
Air Products and Chemicals Inc.
Leach Michael
Marsh William F.
Simmons James C.
Theisen Mary Lynn
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