Process for the preparation of low-density flexible polyurethane

Details Process for the preparation of low-density flexible polyurethane Process for the preparation of low-density flexible polyurethane

1991-05-28

1992-09-08

Cooney, Jr., John M.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521129, 521164, 521170, C08G 1806, C08J 900

Patent

active

051458829

ABSTRACT:
The present invention relates to a process for the preparation of low-density flexible polyurethane foams comprising reacting, in a closed mold, a mixture comprising polyisocyanates; compounds containing at least two isocyanate-reactive hydrogen atoms and having a molecular weight in the range from about 400 to about 10,000; water as blowing agent; optionally, compounds containing at least two isocyanate-reactive hydrogen atoms and having a molecular weight in the range from 32 to 399 as chain-extending and crosslinking agents; and optionally, one or more known auxiliaries and additives, wherein one or more of the reaction mixture components is heated before foaming to a temperature of at least 40.degree. C.

REFERENCES:
patent: 4209593 (1980-06-01), Khanna
patent: 4263411 (1981-04-01), Bak
patent: 4508774 (1985-04-01), Grabhoefer et al.
patent: 4645630 (1987-02-01), Rasshofer et al.
patent: 4833176 (1989-05-01), Wolf et al.
patent: 4927864 (1990-05-01), Frisch, Jr. et al.
patent: 4945117 (1990-07-01), Gansen et al.

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