Liquid polyisocyanate compositions, a process for their preparat

Details Liquid polyisocyanate compositions, a process for their preparat Liquid polyisocyanate compositions, a process for their preparat

1989-05-19

1990-07-31

Welsh, Maurice J.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521159, 528 67, 528 77, 560 25, 560158, C08G 1814

Patent

active

049451170

ABSTRACT:
This invention relates to liquid urethane-modified polyisocyanate compositions obtained by reaction of polyisocyanates or polyisocyanate mixtures of the diphenylmethane series containing from about 50 to about 100% by weight diisocyanatodiphenylmethane isomers with substoichiometric quantities of polyether polyol compositions having an average hydroxyl equivalent weight of about 500 to 3000 and an average hydroxyl functionality greater than about 4, optionally followed by mixing the initially formed reaction product with urethane-free polyisocyanates or polyisocyanate mixtures of the diphenylmethane series containing from about 40 to about 100% by weight diisocyanatodiphenylmethane isomers. This invention also relates to a process for the preparation of such polyisocyanate compositions. The invention further relates to the use of such compositions as the polyisocyanate component in the production of flexible polyurethane foams.

REFERENCES:
patent: 3644457 (1972-02-01), Konig et al.
patent: 4055548 (1977-10-01), Carleton et al.
patent: 4229347 (1980-10-01), Holt et al.
patent: 4261852 (1981-04-01), Carroll et al.
patent: 4478960 (1984-10-01), Buethe et al.

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