Microcellular foamed or reaction injection molded polyurethane/p

Details Microcellular foamed or reaction injection molded polyurethane/p Microcellular foamed or reaction injection molded polyurethane/p

1987-08-03

1988-08-16

Welsh, Maurice J.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521167, 528 67, 528 76, 528 77, C08G 1814

Patent

active

047645431

ABSTRACT:
Microcellular foamed or reaction injection molded polyurethane/polyurea elastomers are prepared by reacting an aliphatically bound polyisocyanate, a primary or secondary amine terminated polymer, and an aliphatic diamine chain extender represented by the formulas: ##STR1## wherein A is represented by the group ##STR2## each R, R.sub.1 and R.sub.2 are independently hydrogen or an alkyl group having from 1 to about 4 carbon atoms, x has a value from zero to about 4; y has a value of 1 or 2; z has a value of zero or 1; and when y is 2, z is zero and the sum of y and z is 2 and ##STR3## wherein R is H or alkyl of 1 to 4 carbon atoms and A and A' are NH.sub.2 or H with the provisos that in each ring either A or A' is NH.sub.2, not both and when A or A' is NH.sub.2 then the R attached to that carbon atom is H.

REFERENCES:
patent: 4642320 (1987-02-01), Turner et al.

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