Preparation of liquid epoxy resins from bisphenols

Details Preparation of liquid epoxy resins from bisphenols Preparation of liquid epoxy resins from bisphenols

1976-12-07

1979-01-02

Schain, Howard E.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

526 68, 528 95, C08G 5906

Patent

active

041327187

ABSTRACT:
A liquid epoxy resin is produced by gradually feeding an aqueous solution of alkali metal hydroxide into a solution of bisphenol-A in epichlorohydrin, while maintaining the reaction medium at boiling point, distilling off water in the form of an azeotrope with epichlorohydrin and recycling the latter, and maintaining a water content of from 0.1 to 0.7 wt.% and a pH value between 7 and 9 in said reaction medium. The liquid epoxy resins thus obtained have low values of the viscosity, epoxy equivalent and hydrolyzable chlorine content.

REFERENCES:
patent: 2801227 (1957-07-01), Goppel
patent: 2840541 (1958-06-01), Pezzaglia
patent: 2921049 (1960-12-01), Moroson
patent: 2995583 (1961-08-01), Larkin et al.
patent: 3069434 (1962-12-01), Spence et al.
Lee & Neville, "Handbook of Epoxy Resins", McGraw-Hill, New York, 1967, pp. 2-10.

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