Polyisocyanate mixtures containing isocyanurate groups, a proces

Details Polyisocyanate mixtures containing isocyanurate groups, a proces Polyisocyanate mixtures containing isocyanurate groups, a proces

1991-08-15

1992-06-23

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, 521902, 544221, 25218221, 25218222, 25218223, C08G 1877

Patent

active

051243709

ABSTRACT:
Disclosed herein are liquid polyisocyanate mixtures containing isocyanurate groups and having an NCO content of 15 to 30% by weight obtainable by partial trimerization of the isocyanate groups of polyisocyanate mixtures of the diphenyl methane series containing 80 to 100% by weight diisocyanatodiphenyl methane isomers and 0 to 20% by weight higher than difunctional polyisocyanates of the diphenyl methane series, 40 to 80% by weight of the diisocyanatodiphenyl methane isomers consisting of 4,4'-diisocyanatodiphenyl methane, 20 to 60% by weight of 2,4'-diisocyanatodiphenyl methane and 0 to 8% by weight of 2,2'-diisocyanatodiphenyl methane and the percentages shown adding up to 100.

REFERENCES:
patent: 3487080 (1969-12-01), Maisui et al.
patent: 3960788 (1976-06-01), Cascurida et al.
patent: 4115373 (1978-09-01), Henes et al.
patent: 4382125 (1983-05-01), Narayan et al.
patent: 4597909 (1986-07-01), Keggenhoff et al.

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