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US 7,125,914 B2Granted
Heat-cured furan binder system
AssigneeAshland Licensing and Intellectual Property LLC
InventorKen K. Chang
Life of this patent
Estimating the term…
Abstract
This invention relates to a heat-cured furan foundry binder system comprising a furan binder and a furan monomer or oligomer containing at least two terminal hydroxymethyl groups. The binders are particularly useful as warm-box binders, because they cure faster and foundry shapes (typically cores and molds) made with the binders exhibit higher tensile strengths than those made with conventional heat-cured furan binders.
Claims7
A heat-cured furan binder system comprising:
- (a) from 5 to 50 parts by weight of a furan resin;
- (b) from 5 to 50 parts by weight of furfuryl alcohol;
- (c) from 1 to 50 parts by weight of a dimethyolated furan selected from the group consisting of dimethylolated furan monomers, dimethyolated furan oligomers, and mixtures thereof,
- d) from 1 to 10 parts by weight of polyvinyl acetate;
- and
- e) from 1 to 10 parts by weight of an activator selected from the group consisting of resorcinol pitch, bisphenol A tar, and mixtures thereof,
- wherein said parts by weight are based upon 100 parts of binder resin.
4 more elements
Dependencies are inferred from the claim text.