Stabilizer for bisphenols and process of using same

US4894486A · kind A · utility

Assignee

• THE DOW CHEMICAL COMPANY · US

Inventors

• Lawrence E. Neil · Angleton, US
• Theodore J. Gormanos · Lake Jackson, US

Key dates

• Filing date: Dec 22, 1988
• Grant date: Jan 16, 1990
• Expiry date: Dec 22, 2008

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C37/88
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Lactic, malic and glyceric acids have been found to be superior to the hydroxy acids here-to-fore employed for the stabilization of bisphenols. These hydroxy carboxylic acids or their ammonium or alkali metal salts can be added to the feed reactants used to make the bisphenols or to the reaction mixture after the reaction is complete or at any point in between. They are particularly useful when the bisphenol is exposed to high temperatures, e.g. during the separation of the bisphenol from the reaction mixture or in a melt.