Phenolic resin and binding agent for producing moulds and cores according to the phenolic resin-polyurethane method
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United States of America Patent
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Apr 29, 2003
Grant Date -
N/A
app pub date -
Jul 10, 2000
filing date -
Sep 4, 1997
priority date (Note) -
Expired
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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.
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