Novel catalyst system for RIM elastomers

Details Novel catalyst system for RIM elastomers Novel catalyst system for RIM elastomers

1980-04-01

1981-06-16

Welsh, Maurice J.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521126, 521127, 521129, C08G 1814

Patent

active

042738857

ABSTRACT:
The invention is a method for making reaction injection molded polyurethane of improved properties. The product comprises the reaction product of a high molecular weight polyhydric polyether, a low molecular weight active hydrogen containing compound of at least two functionality, a polyisocyanate and a catalyst combination comprising a weak tertiary amine, a fast gelation organo tin compound and a delayed action organo tin catalyst. This catalyst combination results in improved processing, a minimum of surface defects and excellent green strength. Reaction injection molded elastomers are useful as molded articles of commerce including, but not limited to, vehicle body parts.

REFERENCES:
patent: 3397158 (1968-08-01), Britain et al.
patent: 4048105 (1977-09-01), Salisbury
patent: 4115321 (1978-09-01), Sandner et al.
patent: 4150212 (1979-04-01), Meyborg

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