Phenolic resin and binding agent for producing moulds and cores according to the phenolic resin-polyurethane method

US6554051B1 · kind B1 · utility

Inventors

• Andreas Werner · Königstein, DE
• Diether Koch · Mettmann, DE

Key dates

• Filing date: Jul 10, 2000
• Grant date: Apr 29, 2003
• Expiry date: Jul 10, 2020

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/542
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

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.