Patent ID: 9636742
Date: 2017-05-02
CPC Classifications: B22C,C08G,C08K,C08L

Claim:
1. A binder composition for making foundry molds, comprising: an acid-hardening resin; one or more 5-position-substituted-furfural compounds selected from the group consisting of 5-hydroxymethylfurfural and 5-acetoxymethylfurfural; and one or more compounds selected from the group consisting of urea, alkylene ureas, alkyl ureas, cyclohexyl ureas, aryl ureas, hydroxyalkyl ureas having two or more carbon atoms in the alkyl group, and azodicarbonamide, wherein the content of the 5-position-substituted-furfural compound(s) is from 10 to 50% by weight of the binder composition, the content of the compound(s) selected from the group consisting of urea, alkylene ureas, alkyl ureas, cyclohexyl ureas, aryl ureas, hydroxyalkyl ureas having two or more carbon atoms in the alkyl group, and azodicarbonamide is from 1 to 8% by weight of the binder composition, and the binder composition further comprises water.