Cold-box binders containing an epoxy resin, acrylate, and certain alkyl esters
AssigneeAshland Licensing and Intellectual Property LLC
InventorsJorg Kroker, H. Shriver
Life of this patent
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Abstract
This invention relates to foundry binder systems, which will cure in the presence of sulfur dioxide and a free radical initiator, comprising (a) an epoxy resin; (b) an acrylate; (c) an alkyl ester of a fatty acid, wherein the alkyl group of the ester is an aliphatic hydrocarbon having from 4 to 8 carbon atoms, preferably butyl tallate; and (d) an effective amount of a free radical initiator. The foundry binder systems are used for making foundry mixes. The foundry mixes are used to make foundry shapes (such as cores and molds) which are used to make metal castings, particularly ferrous castings.
Claims12
A foundry binder system, which will cure in the presence of sulfur dioxide and a free radical initiator, comprising:
- (a) 20 to 70 parts by weight of an epoxy resin;
- (b) 1 to 50 parts by weight of an acrylate;
- (c) 1 to 30 parts of isooctyl tallate;
- and
- (d) an effective amount of a peroxide,
- wherein (a), (b), and (c) are separate components or mixed with another of said components, provided (b) is not mixed with (d), and where said parts by weight are based upon 100 parts of binder.
A cold-box process for preparing a foundry shape comprising:
- (a) introducing the foundry mix of claim 9 into a pattern;
- and
- (b) curing with gaseous sulfur dioxide.
Dependencies are inferred from the claim text.