Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1979-12-14
1981-03-17
Welsh, Maurice J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
521160, C08G 1818, C08G 1820
Patent
active
042568498
ABSTRACT:
The instant invention is directed to a process for the production of cold setting, flexible foams which contain urethane groups by the reaction of polyethers with a molecular weight of 400 to 10,000 which contain at least two hydroxyl groups and in which at least 10% by weight of the hydroxyl groups are primary hydroxyl groups, with a mixture of diphenyl methane diisocyanates and oligomeric polyphenyl-polymethylene polyisocyanates in the presence of blowing agents and optionally in the presence of catalysts and other foaming aids, the improvement wherein the mixture of diphenyl methane diisocyanates and polyphenyl-polymethylene polyisocyanate mixtures is substantially free of carbodiimide groups, has an isocyanate content greater than 30%, and contains from 60 to 90% by weight of 4,4' diphenyl methane diisocyanate and from 3 to 30% by weight of 2,4' diphenyl methane diisocyanate.
REFERENCES:
patent: 3277173 (1966-10-01), Powers et al.
patent: 3362979 (1968-01-01), Bentley
patent: 3857890 (1974-12-01), Recchia et al.
patent: 4066579 (1978-01-01), Yukuta et al.
Hauptmann Gunter
Ick Jurgen
Konig Klaus
Meiners Hans J.
Oertel Gunter
Bayer Aktiengesellschaft
Gil Joseph C.
Harsh Gene
Welsh Maurice J.
Whalen Lyndanne M.
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