Acid-curable compositions comprising mixtures of furan and epoxy resins and use in preparing formed, shaped, filled bodies
AssigneeCL Industries, Inc.
InventorWayne D. Woodson
Life of this patent
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Abstract
Acid-curable resin compositions are described which comprise a mixture of a furan resin and a minor amount of an acid-curable epoxy resin. The acid-curable resin compositions may contain other components such as catalysts, solid particulate materials, etc. The procedures for curing such acid-curable resin compositions as well as methods for forming shaped, filled bodies such as sand cores and molds also are described. Sand cores and molds produced in accordance with the method of the invention exhibit good compression strength, good chemical resistance and increase resistance to stress cracking.
Claims23
An acid-curable resin composition comprising a furan resin, from about 5 to about 45 parts by weight, per 100 parts of the furan resin, of an acid-curable epoxy resin, and an organic sulfonic acid or salt catalyst effective to initiate polymerization of the composition.
An acid-curable resin composition comprising a mixture comprising
- (A) a major amount of a solid particulate material, and
- (B) a minor amount of a resin composition comprising a furan resin, from about 5 to about 45% by weight, based on the weight of the furan resin, of an acid-curable epoxy resin, and an organic sulfonic acid or salt catalyst effective to initiate polymerization.
A method of forming shaped, filled bodies comprising a mixture of furan resin and inorganic solid particulates which comprises the steps of
- (a) preparing a mixture comprising a major amount of inorganic solid particulates and a minor amount of an acid-curable resin composition comprising
- (i) a furan resin,
- (ii) from about 4 to about 45 parts by weight per 100 parts of the furan resin of an acid-curable epoxy resin, and
- (iii) an organic sulfonic acid or salt catalyst, effective to initiate polymerization.
- (b) forming said mixture into the desired shape, and
- (c) effecting a cure of the resin composition.
Dependencies are inferred from the claim text.