Adducts of diaminodiphenyl sulfone compounds as hardeners for epoxy resins
AssigneeCiba-Geigy Corporation
InventorYefim Blyakhman
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Abstract
The present invention relates to a hardener for polyfunctional epoxy resins comprising the adduct obtained from the reaction of (1) a diaminodiphenyl sulfone of the formula ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are independently hydrogen, C.sub.1 -C.sub.4 alkyl or halogen and (2) a cycloaliphatic diepoxide at a ratio of aminohydrogen equivalent of said sulfone to said epoxy equivalent of said diepoxide from 2.5:1 to 75:1.
Claims2
A hardener for polyfunctional epoxy resins comprising the adduct of 3,3'-diaminodiphenylsulfone and a cycloaliphatic diepoxide wherein the ratio of aminohydrogen equivalent of said sulfone to epoxy equivalent of said diepoxide is from 8:1 to 15.2:1.
Dependencies are inferred from the claim text.