Binders containing an epoxy resin, an ester of a fatty acid, and a fluorinated acid
AssigneeAshland Licensing and Intellectual Property LLC
InventorsXianping Wang, H. Randall Shriver, Jorg Kroker
Life of this patent
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Abstract
This invention relates to foundry binder systems, which cure in the presence of sulfur dioxide and an oxidizing agent, comprising (a) an epoxy resin; (b) an ester of a fatty acid; (c) a fluorinated acid, preferably hydrofluoric acid; (d) an effective amount of a oxidizing agent; and (e) no ethylenically unsaturated monomer or polymer. 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 an oxidizing agent, comprising:
- (a) 45 to 80 parts by weight of an epoxy resin;
- (b) 5 to 40 parts of an ester of a fatty acid;
- (c) 0.05 to 3 parts of a fluorinated acid selected from the group consisting of hydrofluoric acid, ammonium bifluoride, tris-hydrofluoric acid, potassium bifluoride, N,N-diisopropyl-amine-tris (hydrogenfluoride), and N,N′-dimethyl-2-imidazolidone-hexakis(hydrogenfluoride);
- (d) from 10 to 40 parts by weight of an oxidizing agent;
- and
- (e) 0 parts of an ethylenically unsaturated monomer or polymer,
- wherein (a), (b), (c), and (d) are separate components or mixed with another of said components, and where said parts by weight are based upon 100 parts of binder.
Dependencies are inferred from the claim text.