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US 6,554,051 B1Granted
Phenolic resin and binding agent for producing moulds and cores according to the phenolic resin-polyurethane method
OwnerAndreas Werner, Diether Kochinventors
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Abstract
A method of preparing foundry shapes, e.g. molds and cores, by mixing a foundry aggregate with a foundry binder, shaping the mixture in a pattern, curing the mixture, and removing the mixture from the pattern. The foundry binder is a phenolic urethane binder that utilizes a phenolic resin prepared by reacting a phenol, an aldehyde, bisphenol-A-tar, and a divalent metal catalyst.
Claims9
A process for preparing a foundry shape by the cold-box process which comprises:
- (a) forming a foundry mix comprising:
- (1) a phenolic resin component comprising a phenolic resin prepared by the reaction of a condensation mixture consisting essentially of a phenol, an aldehyde, bisphenol-A-tar, and a divalent metal catalyst;
- (2) a polyisocyanate component;
- and
- (3) a foundry aggregate;
- (b) forming a foundry shape by introducing the foundry mix obtained from step (a) into a pattern;
- (c) contacting the foundry shape with a volatile tertiary amine catalyst;
- and
- (e) removing the foundry shape of step (c) from the pattern.
6 more elements
Dependencies are inferred from the claim text.