Method of preparing urethane foam articles

Details Method of preparing urethane foam articles Method of preparing urethane foam articles

1990-07-02

1992-08-25

Dawson, Robert A.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 51, 264 53, B29C 6722

Patent

active

051416840

ABSTRACT:
In a method of preparing a urethane foam article having a high density outer surface layer, of the type wherein a plastic liquid containing isocyanates, polyols, a catalyst, a blowing agent, an assistant and other additives is poured into a mold through a one-shot molding process, a certain type of catalyst is added for causing the isocyanates and the blowing agent to create a difference in gas evolving reaction between an inner part and an outer part of the plastic liquid in the mold so as to form a high density layer on the outer surface of a urethane foam article.

REFERENCES:
patent: 3884917 (1975-05-01), Ibbotson
patent: 4025469 (1977-05-01), Kauffman
patent: 4070310 (1978-01-01), Schneider et al.
patent: 4228310 (1980-10-01), Speranza et al.
patent: 4431753 (1984-02-01), Casati et al.
patent: 4514525 (1985-04-01), Ashida et al.
patent: 4636530 (1987-01-01), Narayan
patent: 4681926 (1987-07-01), Goel
patent: 4814359 (1989-03-01), Baker et al.
patent: 4828897 (1989-05-01), Staneluis et al.
patent: 4983320 (1991-01-01), Franklin et al.

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