Method for the preparation of liquid epoxy resins

Details Method for the preparation of liquid epoxy resins Method for the preparation of liquid epoxy resins

C - Chemistry, Metallurgy

08

G

402/292, 260/645

C08G 59/04 (2006.01) C08G 59/06 (2006.01)

Patent

CA 1102488

ABSTRACT OF THE DISCLOSURE 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 maintai- ning 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 hydrolizable chlorine content.

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