PURPOSE: To obtain a novel compound which is easily miscible with epoxy resin and gives water-proof flexible cured material as a hardener of epoxy resin by the reaction of a specific elastomer prepolymer and a polyphenol.
CONSTITUTION: This compound is water-soluble and expressed by the formula I (m=1, 2; n=2-6; R1=n valent group after removing terminal NCO group or amino group from a soluble or dispersible elastomer prepolymer for epoxide resin; R2=H, 1-6C alkyl; R3 = phenolic hydroxyl, m+1 valent group of polyphenol after removing amino group; X=O, NR2). This compound is obtained by the reaction of polyisocyanate of the formula II and polyphenol or aminophenol of the formula III. The compound of the formula II is preferably the additive of hydroxyl terminated polyether or polyester and diisocyanate.
Powell, Jeremy Hugh
Reischmann, Franz-josef
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