Polyamide polyurethane prepared by reaction of polyisocyanate wi

Details Polyamide polyurethane prepared by reaction of polyisocyanate wi Polyamide polyurethane prepared by reaction of polyisocyanate wi

1981-08-14

1982-08-03

Welsh, Maurice J.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521129, 528 53, 528 73, 528 75, C08G 1814

Patent

active

043428410

ABSTRACT:
Polyamide polyurethane polymers are disclosed that are derived from the reaction of (A) an organic polyisocyanate; (B) at least one organic polyol; and (C) a ketene-aminal having the formula ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, and R.sub.4, when taken separately, are independently selected from the group consisting of lower alkyl, aralkyl, and cycloalkyl and, when taken together as R.sub.1 with R.sub.2 and R.sub.3 with R.sub.4 with the respective nitrogen atoms to which they are attached, represent independently heterocyclic groups having from 5 to 7 ring atoms, wherein the equivalent proportions of said polyol component (B) to said ketene-aminal component (C) fall within the range of about 1:4 to about 1:80 and the ratio of equivalents of said isocyanate to total equivalents of isocyanate reactive ingredients (B) plus (C) is within the range of about 0.95:1 to 6:1.
The polymers find particular utility in the preparation of RIM parts which parts have essentially attained their optimum physical properties without the need of a thermal curing step.

REFERENCES:
patent: 2948691 (1960-08-01), Windemuth et al.
patent: 4218543 (1980-08-01), Weber et al.
Polyurethane Chemistry and Technology, Part II by J. H. Saunders and K. C. Frisch, Chapter IX, 1964, Interscience Publishers, New York, N.Y.
Journal of Organic Chem., 29, 2932 (1964), D. H. Clemens et al.

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