Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1978-08-02
1980-02-19
Welsh, Maurice J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
264 455, 521 51, 521126, 521127, 521129, 521159, C08G 1814
Patent
active
041895428
ABSTRACT:
The instant invention is directed to a process for the production of weather-resistant rigid molded foams based on polyurethanes having a dimensional stability under heat according to DIN 53 432 of at least 70.degree. C. and a compact surface, a cellular core and an integral density distribution throughout the cross-section of the moldings, comprising foaming a foamable reaction mixture of polyisocyanates, polyhydroxyl compounds, blowing agents and, optionally, other isocyanate-reactive compounds, activators and other auxiliaries in a closed mold under the conditions of in-mold foaming, the improvement wherein the polyisocyanates used are reaction products containing isocyanate groups and urethane groups, said reaction products formed by reacting diisocyanates containing at least one cycloaliphatically bound isocyanate group and no more than one aliphatically bound isocyanate group with sub-stoichiometric quantities of organic polyhydroxyl compounds.
REFERENCES:
patent: 4058492 (1977-11-01), Bonin et al.
patent: 4116893 (1978-09-01), Flanagan
Grogler Gerhard
Kleimann Helmut
Lienert Hans-Jurgen
Meyborg Holger
Bayer Aktiengesellschaft
Gil Joseph C.
Harsh Gene
Olson R. Brent
Welsh Maurice J.
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