Open celled polyurethane foams

Details Open celled polyurethane foams Open celled polyurethane foams

1988-04-15

1989-05-02

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521110, 521114, 521172, 521174, C08H 900, C08G 1800

Patent

active

048268828

ABSTRACT:
Improved, flexible, open celled polyurethane foams are described. The foams are formed in situ from the reaction of a polyisocyanate, a conventional polyester polyol, a polyether polyol, a high hydroxyl polyester polyol and a blowing agent in the presence of a catalyst. A polyether foam stabilizer is normally also included. A small amount of a destabilizing silicone ingredient can also be included. Useful high hydroxyl number polyester polyols have hydroxyl numbers in the range 300-600, and preferably 400-450. The average equivalent weight of the useful high hydroxyl number polyester polyol is normally in the range 100-200. The compositions of the invention are useful as filter media and are especially suitable for outdoor seating applications.

REFERENCES:
patent: 3748288 (1973-07-01), Winkler et al.
patent: 3884848 (1975-05-01), Ricciardi et al.
patent: 4178161 (1979-12-01), Rudner et al.
patent: 4656196 (1987-04-01), Kelly et al.

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