Foundry processes and compositions

US4236569A · kind A · utility

Assignee

• The White Sea & Baltic Company Limited · GB

Inventors

• David Epstein · Sha Tin, CN
• John Bugg · London, GB

Key dates

• Filing date: May 19, 1978
• Grant date: Dec 2, 1980
• Expiry date: May 19, 1998

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B22C1/22
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

When making a foundry mould or core from a fluid mixture comprising sand and a foamed aqueous phase comprising resin condensate, foaming agent and acid curing agent and that is a stable foam, improved results are obtained if the fluid mixture is obtained by forming a fluid mix of the sand, resin condensate and foaming agent and then mixing the acid curing agent into this.