Method for the preparation of flexible polyurethane foams with r

Details Method for the preparation of flexible polyurethane foams with r Method for the preparation of flexible polyurethane foams with r

1991-08-15

1992-07-21

Welsh, Maurice J.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521125, C08G 1808

Patent

active

051323338

ABSTRACT:
A method for the preparation of flexible foams containing urethane groups and having a reduced hardness is disclosed. Polyethers, having at least two hydroxyl groups and a molecular weight of 400 to 12,000 are reacted with polyisocyanates in the presence of catalysts and water and, optionally, in the presence of emulsifiers, stabilizers, cross linking agents, blowing agents and conventional auxiliaries and additives. The method is carried out in the presence of 0.01 to 1.0 parts by weight, based on 100 parts by weight of the polyol, of the alkali salt or the alkaline earth metal salt of a hydroxycarboxylic acid. The method enables the use of chlorofluorocarbons to be omitted largely or completely as physical blowing agents.

REFERENCES:
patent: 2911379 (1959-11-01), Parker et al.
patent: 3087900 (1963-04-01), Brown
patent: 3087901 (1963-04-01), Brown
patent: 5025039 (1991-06-01), Neuhaus et al.
"Justus Liebigs-Annalen Der Chemie", pp. 76-136, by Werner Siefken.

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