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US 4,079,031 AGranted
Improved foundry process and binder resin composition therefor
AssigneeDelta Oil Products Corporation
InventorsKashinath S. Sardessai, Jordan J. Kopac
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Abstract
An improved binder resin is disclosed for use in a foundry process, comprising a major proportion of a resole phenolic resin and a minor proportion of a polyether polyol and a mutual solvent therefor, wherein the polyol has an average molecular weight between about 200 and 5000 and a hydroxy functionality of about 2 to 4. The improved binder is used in the foundry process by mixing it with a polyisocyanate and preferably an amine catalyst.
Claims15
The process of preparing shaped foundry products which comprises:
- (a) forming a foundry mix by uniformly distributing a foundry aggregate containing sand as a major constituent in a binding amount of up to 10% based on the weight of the aggregate of a binder resin composition comprising a resole phenolic resin, a minor proportion of a polyether polyol, and a mutual solvent system therefor, said polyol having an average molecular weight between about 200 and 5000 and having an average hydroxyfunctionality between about 2 and 4;
- (b) mixing therewith a polyisocyanate in a concentration of 10 to 500% by weight of the phenolic resin;
- (c) shaping the foundry mix in a mold;
- and
- (d) permitting said binder resin composition to react with said polyisocyanate to form a thermoset copolymer and to bind the shaped foundry mix.
2 more elements
Dependencies are inferred from the claim text.