Preparation of novolak epoxy resins

Details Preparation of novolak epoxy resins Preparation of novolak epoxy resins

1976-12-06

1979-01-30

Anderson, Harold D.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

526 68, 528147, 528153, C08G 5908

Patent

active

041372204

ABSTRACT:
A Novolak epoxy resin is prepared by adding an aqueous solution of alkali metal hydroxide to a solution of Novolak phenolic resin in epichlorohydrin, distilling off water during said addition in the form of an azeotrope with epichlorohydrin and recycling the latter, while maintaining the reaction medium at 60-80.degree. C and at a pH between 7 and 8 and a water content of from 0.5 to 2.5 wt.% in said medium.
The thermosetting resin thus obtained can be used in applications requiring resins with low chlorine contents, low viscosity and high epoxy value.

REFERENCES:
patent: 2801227 (1957-07-01), Goppel
patent: 2829124 (1958-04-01), Napravnik et al.
patent: 2840541 (1958-06-01), Pezzaglia
patent: 3252850 (1966-05-01), Partansky
patent: 3860561 (1975-01-01), Vargiu et al.
patent: 3867346 (1975-02-01), Vargiu et al.
Lee & Neville, Handbook of Epoxy Resins, McGraw-Hill, New York, 1967, pp. 2-10.

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