Process for preparing a flexible foam

Details Process for preparing a flexible foam Process for preparing a flexible foam

1995-11-01

1998-06-30

Sergent, Rabon

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

521114, 521116, 521117, 521130, 521159, 521160, 521174, C08J 908, C08G 1822

Patent

active

057734836

ABSTRACT:
A method for the preparation of flexible polyurethane foams by reacting a polyisocyanate containing at least 85% by weight of 4,4'-diphenylmethane diisocyanate or a liquid variant thereof with a polyol composition comprising at least one poly(oxyethylene-oxyalkylene) polyol having an average nominal hydroxyl functionality of from 2 to 6, a number average hydroxyl equivalent weight of from 1000 to 3000, and an average oxyethylene content of from 50 to 85% by weight and with water in the presence of a catalytically effective amount of an alkali or alkaline earth metal carboxylate salt.

REFERENCES:
patent: 3940517 (1976-02-01), DeLeon
patent: 4098732 (1978-07-01), Yukuta et al.
patent: 4365025 (1982-12-01), Murch et al.
patent: 4393015 (1983-07-01), Kaneda et al.
patent: 4797464 (1989-01-01), Nodelman
patent: 5063253 (1991-11-01), Gansen et al.
patent: 5114989 (1992-05-01), Elwell et al.

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