Method for manufacturing polyurethane foam

Details Method for manufacturing polyurethane foam Method for manufacturing polyurethane foam

1987-01-16

1988-12-20

Kight, John

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521159, 521160, 521163, 521172, 521174, C08G 1830

Patent

active

047925752

ABSTRACT:
A method for manufacturing polyurethane foam by mixing (a) polyisocyanate, (b) polyol, (c) blowing agent, (d) catalyst and, as required (e) surface active agent, filler, or other such additive, the said method being characterized in that the polyisocyanate (a) is a prepolymer with isocyanate end groups produced from a polyester polyol and a blended polyisocyanate component comprising 45-95 weight % of diphenylmethane diisocyanate and 55-5 weight % of a polymethylene polyphenyl polyisocyanate with a functionality of 3 or more.

REFERENCES:
patent: 4251639 (1981-02-01), Jarre et al.
patent: 4261852 (1981-04-01), Carroll et al.

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