Liquid, light-colored polyisocyanate mixtures and a process for

Details Liquid, light-colored polyisocyanate mixtures and a process for Liquid, light-colored polyisocyanate mixtures and a process for

1992-12-30

1995-06-20

Acquah, Samuel A.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521137, 521159, 521160, 528 66, 528 76, C08J 900

Patent

active

054261260

ABSTRACT:
An isocyanate terminated prepolymer based upon diphenylmethane isocyanates. This prepolymer is the reaction product of a diphenylmethane isocyanate mixture having from about 75 to about 95 wt % binuclear isomers and from about 5 to about 25 wt % polymeric isocyanate with a polyether polyol. The binuclear isomer content is generally from about 15 to about 40 wt % 2,4'-isomer and from about 2 to about 10 wt % 2,2'-isomer. The polyether polyol has a functionality of from about 3 to about 8, an OH number of from about 350 to about 1000 mg KOH/g and a molecular weight of from about 150 to about 1000. These prepolymers are particularly useful as starting materials for the production of light-colored, dimensionally stable rigid polyurethane foams.

REFERENCES:
patent: 4365025 (1982-12-01), Murch et al.
patent: 4945117 (1990-07-01), Gansen et al.
patent: 5028637 (1991-07-01), Milliren
Webster's New Collegiate Dictionary, pp. 386-387.
Chemical Abstracts, vol. 109, No. 18, Abstract No. 55878s.
Chemical Abstracts, vol. 100, No. 18, Abstract No. 140234n.
Chemical Abstracts, vol. 115, No. 18, Abstract No. 184944h.

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