Process for preparing low-chlorine epoxy resins

Details Process for preparing low-chlorine epoxy resins Process for preparing low-chlorine epoxy resins

1991-01-31

1992-03-24

Kight, III, John

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

528 90, 528 93, 528 95, 528 98, C08G 5906, C08G 5908

Patent

active

050989642

ABSTRACT:
A process is disclosed for preparing a low-chlorine tetrafunctional epoxy resin which employs crystallization of the epoxy resin from solution in a finishing step of the preparation process. The process involves (a) contacting, in a basic reaction medium, epichlorohydrin and a tetraphenol of ethane to produce a reaction product mixture containing a polyglycidyl ether of the tetraphenol of ethane; (b) dissolving the polyglycidyl ether in an organic solvent and, optionally, contacting the polyglycidyl ether with a dehydrochlorination agent; and (c) reducing the temperature of the organic solvent so as to effect crystallization of a low-chlorine fraction of the polyglycidyl ether.

REFERENCES:
patent: 3013087 (1961-12-01), Schwarzer
patent: 4153621 (1979-05-01), Hartmann
patent: 4661644 (1987-04-01), Silvis
patent: 4722983 (1988-02-01), Monnier
patent: 4778863 (1988-10-01), Wang
patent: 4785061 (1988-11-01), Wang

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