Process for making epoxy novolac resins with low hydrolyzable ch

Details Process for making epoxy novolac resins with low hydrolyzable ch Process for making epoxy novolac resins with low hydrolyzable ch

1983-11-03

1984-11-27

Nielsen, Earl A.

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

Synthetic resins

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

C08G 5908, C08G 5914

Patent

active

044852215

ABSTRACT:
A process for making glycidyl ethers of novolac resins, particularly phenol or cresol novolacs, with low hydrolyzable chlorine and low ionic chloride content, said resins prepared by reaction of a novolac resin with epichlorohydrin in an alkaline medium, comprises dissolving the crude epoxy novolac resin in an inert organic solvent, treating the solution obtained with an excess amount of an alkali metal alkoxide, neutralizing the excess alkali with a weak acid, removing the alkali metal chloride formed by filtration in the presence of a filter aid and isolating the epoxy novolac resin by distillation of the solvent.

REFERENCES:
patent: 4102866 (1978-07-01), Speranza et al.
patent: 4447598 (1984-05-01), Caskey et al.
J. Cason et al., J. Org. Chem. 18,850 (1953).

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