Foamed polyester of a cyclic diacid anhydride with an epoxide

Details Foamed polyester of a cyclic diacid anhydride with an epoxide Foamed polyester of a cyclic diacid anhydride with an epoxide

1978-02-08

1978-11-14

Phynes, Lucille M.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521178, C08J 906

Patent

active

041254880

ABSTRACT:
The invention provides a process for the production of a foamed polyester which comprises initiating a reaction between a poly-terminal epoxide, a mono-terminal epoxide and a cyclic diacid anhydride in the presence of a catalytically effective quaternary salt and a blowing agent, heating to a point at which the reaction becomes a self-sustaining exothermic reaction and controlling the reaction such that the temperature of the mixture is not reduced until after the exothermic reaction has begun to subside.

REFERENCES:
patent: 3213067 (1965-10-01), Pohl et al.
patent: 3370043 (1968-02-01), Milligan
patent: 3627720 (1971-12-01), Hinton et al.
patent: 3723390 (1973-03-01), Carpenter et al.
patent: 3766146 (1973-10-01), Thompson
patent: 3864316 (1975-02-01), Robinson
patent: 3979368 (1976-09-01), Malfroid
patent: 4028289 (1977-06-01), Brown

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