Binder composition for mold making, binder/curing agent composition for mold making, sand composition for mold making, and process of making mold
AssigneeKao Corporation
InventorsKazuhiko Kiuchi, Shigeo Nakai, Masuo Sawa, Masayuki Kato, Mitsuru Sakai, Shinya Nomura
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Abstract
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.
Claims24
A binder composition for mold making which 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):
- ##STR5## wherein X.sub.1, X.sub.2 each independently represent a hydrogen atom, a methyl group or an ethyl group, and
- wherein said acid-curable resin is at least one compound selected from the group consisting of a phenol/aldehyde polycondensate, a urea/aldehyde polycondensate, and a co-condensate of said phenol/aldehyde and said urea/aldehyde polycondensates.
A binder/curing agent composition for casting mold making which comprises:
- (i) a binder composition comprising:
- (a) a binder comprising an acid-curable resin, and
- (b) from 0.5 to 63.0% by weight, based on the total weight of binder (a) and curing accelerator (b), of at least one curing accelerator selected from compounds represented by formula (1):
- ##STR8## wherein X.sub.1, X.sub.2 each independently represent a hydrogen atom, a methyl group or an ethyl group;
- and
- (ii) a curing agent composition comprising a phosphorus-containing compound and a sulfur-containing compound at such a weight ratio that a weight ratio of sulfur atoms to the total weight of phosphorus atoms and sulfur atoms is from 0.01 to 0.7, and
- wherein said acid-curable resin is at least one compound selected from the group consisting of a phenol/aldehyde polycondensate, a urea/aldehyde polycondensate, and a co-condensate of said phenol/aldehyde and said urea/aldehyde polycondensates.
Dependencies are inferred from the claim text.