Kao Corporation

Masuo Sawa

Masayuki Kato

Shigeo Nakai

Kazuhiko Kiuchi

Mitsuru Sakai

Shinya Nomura

A furan resin composition for production of molds has a urea content of 1 to 10 wt-% and a pH value (25&#xb0; C.) of 7 to 10.

Furan resin composition for production of molds

The present invention provides a refractory granular material composition for a self-hardening molding by acid-hardening, consisting essentially of: a refractory granular material, an acid-hardening resin-containing binder composition, an acid-containing hardener composition, and at least one solvent selected from the group consisting of (1) alcohols, (2) ether alcohols and ester shown below:

Acid-curable, refractory particulate material composition for forming mold

Binder composition for production of molds and method of producing mold

Sand compositions containing a binder composition and a curing agent, in which the binder composition comprises (a) a binder comprising an acid-curable resin and (b) from 0.5 to 63.0% by weight, based on the binder composition, of at least one curing accelerator selected from compounds represented by formula (1): ##STR1## wherein X.sub.1, X.sub.2 each represent a hydrogen atom, a methyl group or an ethyl group; exhibit an increased curing rate to provide a casting mold having an increased initial strength.

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Wakayama, Japan

Masuo Sawa