Process for preparing heat-resistant polyurethane elastomers hav

Details Process for preparing heat-resistant polyurethane elastomers hav Process for preparing heat-resistant polyurethane elastomers hav

1978-07-10

1980-03-04

Welsh, Maurice J.

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

Synthetic resins

From reactant having at least one -n=c=x group as well as...

528 74, 528 76, 528 83, 528 85, C08G 1810

Patent

active

041918185

ABSTRACT:
Polyurethane elastomers of improved heat stability are made by a process in which a polyisocyanate is reacted with a polyol of high molecular weight with an OH:NCO ratio of 1:0.66 to 1:0.85, and the resulting adduct is later reacted with an excess of symmetrical diisocyanate and a diol as chain extender.

REFERENCES:
patent: 2723935 (1955-11-01), Rodman
patent: 2871226 (1959-01-01), McShane
patent: 2981719 (1961-04-01), Mulhausen et al.
patent: 3192186 (1965-06-01), Muller et al.
patent: 3730927 (1973-05-01), Schloss
patent: 3905925 (1975-09-01), Vervloet

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