Thermoset molding compositions catalyzed by 1,4-benzoquinone sal

Details Thermoset molding compositions catalyzed by 1,4-benzoquinone sal Thermoset molding compositions catalyzed by 1,4-benzoquinone sal

1988-11-30

1989-11-14

Welsh, Maurice J.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

528 54, C08G 1820

Patent

active

048808466

ABSTRACT:
Disclosed is a process for the catalyzed reaction of an isocyanate and an active hydrogen compound wherein the reaction is conducted in the presence of a novel catalyst comprising the salt of 1,8-diazobicyclo(5.4.0)undec-7-ene and 1,4-benzoquinone. Preferred catalyzed reaction mixtures comprise Reaction Injection Molding urethanes (RIM). The novel catalyst salts provide a controlled induction period prior to the onset of gelation of the reaction mixture while providing complete cure of the reaction mixture thereafter.

REFERENCES:
patent: 4798879 (1989-01-01), Hannah et al.

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