Microcellular elastomeric polyurethane foams

Details Microcellular elastomeric polyurethane foams Microcellular elastomeric polyurethane foams

1997-06-10

1999-10-19

Truong, Duc

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521155, 521159, 521137, 528 67, 528 76, 528 85, C08J 900

Patent

active

059689935

ABSTRACT:
A method for the preparation of microcellular elastomeric polyurethane foams from a reaction mixture comprising a polyisocyanate component containing at least 85% by weight of 4,4'-diphenylmethane diisocyanate or a variant thereof, a polyol composition comprising at least one polyoxyalkylene polyol having an average nominal hydroxyl functionality of from 2 to 6, an average hydroxyl equivalent weight of at least 1300 and an average oxyethylene content of between 50 and 85% by weight, water, a chain extender having an average hydroxyl equivalent weight of from 15 to 250 and optionally a crosslinking agent, the hardblock-content being more than 45% by weight.

REFERENCES:
patent: 4302552 (1981-11-01), Hongu et al.
patent: 4365025 (1982-12-01), Murch et al.
patent: 4525491 (1985-06-01), Narisawa et al.
patent: 5070114 (1991-12-01), Watts et al.

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