Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Composite article making
Patent
1986-05-23
1989-08-08
Lowe, James
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Composite article making
264 457, 264311, 264DIG5, 264DIG13, 264DIG14, 425425, B29C 6720, B29C 4104, B29D 900
Patent
active
048550965
ABSTRACT:
A method for producing articles of polyurethane or the like wherein a mold of the article shape is positioned to centrifugally receive a polyurethane composition comprising polyisocyanates, polyol, water and fluorocarbons such that the polyurethane molecules striking the wall of the mold are broken to provide a resulting smooth non-porous outer skin for the article and wherein additional polyurethane materials provide a foamed interior for the article. The water serves as a reactive polyol and reacts with the polyisocyanate to create carbon dioxide gas which yields increased expansion pressure which causes the foaming polymer to produce a uniform skin around a cellular inner core.
REFERENCES:
patent: 3200180 (1965-08-01), Russ
patent: 3505437 (1970-04-01), Eichmann
patent: 3605848 (1971-09-01), Lombardi
patent: 3751551 (1973-08-01), McGillvary
patent: 3956448 (1976-05-01), Larson
patent: 4472340 (1984-09-01), Boden
patent: 4478567 (1984-10-01), Schaer
Handbook of Foamed Plastics; Rene Bender; 1965; Lake Publishing Co. Libertyville Ill., pp. 134-135.
Advances in Polyurethane Technology; J. M. Buist and H. Gudgeon; 1968; Wiley & Sons Inc., N.Y.; p. 274.
Criddle B. Deon
Durkin II Jeremiah F.
Lowe James
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