Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Composite article making
Patent
1974-09-09
1976-01-06
Lieberman, Allan
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Composite article making
106271, 260 25AZ, 264 53, 264129, 264233, 264338, 264DIG14, B29C 104, B29D 2700
Patent
active
039313816
ABSTRACT:
In molding polyurethane integral-skin foam the foam tends to stick to the mold surface. Conventional mold release agents have not been found effective; they fail to provide full release of the molded product, are not durable enough to withstand more than one molding cycle, interfere with development of the integral skin, or plate onto the integral-skin thus necessitating solvent washing of the molded foam product. This invention is a method of preparing a mold to release flexible polyurethane integral-skin foam, free from skin damage and other defects, that is durable, i.e., that will permit many molding cycles before requiring replacement, and that permits the molded foam to be merely water washed to remove all traces of the mold release agent.
REFERENCES:
patent: 2902376 (1959-09-01), Beacher et al.
patent: 3046177 (1962-07-01), Hankins
patent: 3101244 (1963-08-01), Hood et al.
patent: 3165567 (1965-01-01), Olson
patent: 3210448 (1965-10-01), Szabat
patent: 3341646 (1967-09-01), Britain
patent: 3413390 (1968-11-01), Heiss
patent: 3492394 (1970-01-01), Heihe
patent: 3523918 (1970-08-01), Gonzalez
Lieberman Allan
The General Tire & Rubber Company
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