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US 4,066,588 AGranted
Cold-curing binder for foundry sand cores and molds
AssigneeSumitomo Durez Company, Ltd.
InventorsKyohei Funabiki, Noriaki Matsushima, Toshiyuki Tachikawa, Kazuichi Ikeda
Life of this patent
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Abstract
A cold-curing binder for foundry sand cores and molds comprises (a) an oil-modified alkyd resin, said resin characterized by an oil component which comprises a mixture of tall oil fatty acid and linseed oil in the ratio of from about 20:80 to about 80:20 parts by weight, (b) a polyisocyanate component, and (c) a curing accelerator. The novel binders of this invention generate less objectionable odor during the casting operation and cure more rapidly than conventional binders.
Claims14
A cold-curing binder for foundry sand cores and molds which comprises:
- a. a tall oil fatty acid-modified alkyd resin prepared from components comprising a polybasic acid, a polyhydric alcohol, and a mixture of tall oil fatty acid, having a fatty acid content of at least about 90%, and linseed oil in a weight proportion of tall oil fatty acid to linseed oil in the range of from about 50:50 to about 70:30,
- b. a polyisocyanate, present in the amount of about 5 to about 40 percent by weight of resin, and
- c. a curing accelerator.
Dependencies are inferred from the claim text.