RIM elastomers based on prepolymers of cycloaliphatic diisocyana

Details RIM elastomers based on prepolymers of cycloaliphatic diisocyana RIM elastomers based on prepolymers of cycloaliphatic diisocyana

1996-06-04

1998-04-14

Sergent, Rabon

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...

264 51, 2643281, 2643282, 2643286, 521159, 521163, 521167, 521172, 521173, 521174, 521176, 528 59, 528 61, 528 65, 528 66, 528 67, 528 76, 528 80, C08G 1810, C08G 1812, C08G 1866, C08G 1875

Patent

active

057392536

ABSTRACT:
This invention relates to a process for the production of polyurethane/urea elastomers from a reaction injection molding process of a reaction mixture on the presence of a catalyst via the one-shot process. The isocyanate component of this invention is a prepolymer based on a cycloaliphatic diisocyanate, and having an NCO content of 12-27%, an average isocyanate functionality of less than 2.3, a monomer content of greater than about 25% by weight, and containing urethane or urea groups. The isocyanate-reactive blend comprises a high molecular weight polyether polyol and a low molecular weight chain extender wherein the equivalent ratio of hydroxyl groups to amine groups of the chain extender is from 1:2 to 20:1. This invention also relates to the polyurethane/urea molded article produced by the above process.

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