Thermoset molding compositions catalyzed by keto-enol salt and 1

Details Thermoset molding compositions catalyzed by keto-enol salt and 1 Thermoset molding compositions catalyzed by keto-enol salt and 1

1988-11-30

1990-06-19

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521118, 521129, 528 49, 528 54, C08G 1820, C08G 1818

Patent

active

049354531

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-diazo-bicyclo(5.4.0)undec-7-ene and a keto-enol of the formula ##STR1## where R is a non-acid containing cyclic residue. 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: 3769244 (1973-10-01), Hashimoto et al.
patent: 4431753 (1984-02-01), Casati et al.

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