Process for the preparation of diepoxides

Details Process for the preparation of diepoxides Process for the preparation of diepoxides

1976-07-08

1977-05-31

Bernstein, Hiram H.

Concentrating evaporators

Processes

Film

159DIG8, 159DIG15, 159DIG16, 203 91, B01D 122

Patent

active

040267610

ABSTRACT:
Diepoxides of the general formula: ##STR1## wherein n has an average value not exceeding 0.03 and R is the bisphenyl radical of bisphenol-A are recovered from an epoxy resin of the same general formula with n varying from 0.07 to 0.30, by removing the low-boiling substance from the epoxy resin at 0.1-1 mm Hg and 165.degree.-200.degree. C and distilling off said diepoxide from the thus treated epoxy resin at 0.1-0.005 mm Hg and a temperature not exceeding 240.degree. C. The low viscosity, narrow molecular weight distribution and excellent purity of these diepoxides allow their use in critical application fields.

REFERENCES:
patent: 3410761 (1968-11-01), Slattery
patent: 3892634 (1975-07-01), Hajek

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