Poly(aryl ether)-poly(aryl carbonate) block copolymers and their preparation

US4994533A · kind A · utility

Assignee

• THE DOW CHEMICAL COMPANY · US

Inventors

• Michael J. Mullins · Lake Jackson, US
• Steven P. Crain · Midland, US
• Edmund P. Woo · Midland, US
• Daniel J. Murray · Midland, US
• Stephen E. Bales · Midland, US

Key dates

• Filing date: Mar 28, 1989
• Grant date: Feb 19, 1991
• Expiry date: Mar 28, 2009

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G64/42
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A method for preparing novel poly(aryl ether)-(poly aryl carbonate) block copolymers by the decarboxylation of copolycarbonates prepared by the condensation of two different aromatic dihydroxy compounds and a carbonate precursor such as phosgene. At least one of the aromatic diols must have at least one electron-withdrawing group located in a position ortho or para to at least one of its hydroxy groups and at least one of the diols must not have any electron-withdrawing groups in a position ortho or para to either of its hydroxy groups. The method is particularly effective in making crystalline block copolymers.