Curable epoxy resin compositions and use in preparing formed, shaped, filled bodies
AssigneeCL Industries, Inc.
InventorWayne D. Woodson
Life of this patent
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Abstract
Curable epoxy resin compositions are described which comprise a mixture of an acid curable epoxy resin and a minor amount of an oxidizing agent capable of reacting with sulfur dioxide to form a catalyst for curing said epoxy resin. The curable epoxy resin composition may contain solid particulate materials. The procedures for curing such epoxy resins as well as methods for forming sand cores and molds also are described. Sand cores and molds produced in accordance with the method of the invention have sufficient strength and hardness after a few seconds of curing for normal foundry applications.
Claims30
A curable epoxy resin composition comprising a mixture of an acid curable epoxy resin and from about 15 to 50% based on the weight of the resin of an oxidizing agent capable of reacting with sulfur dioxide to form a catalyst for curing said epoxy resin.
A curable epoxy resin composition comprising a mixture of
- (a) a major amount of a solid particulate material, and
- (b) a minor amount of (i) an acid curable epoxy resin and (ii) an oxidizing agent capable of reacting with sulfur dioxide to form a catalyst for curing said epoxy resin, the weight for oxidizing agent being from about 15 to about 50% by weight based on the weight of the resin.
A method of curing epoxy resins which comprises
- (a) preparing a mixture of an acid curable epoxy resin and a minor amount of an oxidizing agent capable of reacting with sulfur dioxide to form a catalyst for curing said epoxy resin, and
- (b) treating said mixture with gaseous sulfur dioxide to effect a rapid cure of the epoxy resin.
A curable resin composition comprising a mixture of (a) an acid curable resin selected from the group consisting of vinyl or furfuryl-formaldehyde resins, (b) an acid curable epoxy resin, and (c) from about 15 to about 50% by weight, based on the combined weight of (a) and (b) of an oxidizing agent capable of reacting with sulfur dioxide to form a catalyst for curing said resin mixture.
Dependencies are inferred from the claim text.