Methods for producing and purifying 2-hydrocarbyl-3,3-bis(4-hydroxyaryl)phthalimidine monomers and polycarbonates derived therefrom

US7277230B2 · kind B2 · utility

Assignee

• General Electric Company · US

Inventors

• Veeraraghavan Srinivasan · Bengaluru, IN
• Suresh Shanmugam · Bengaluru, IN
• Gautam Chatterjee · Bengaluru, IN
• Anantharaman Dhanabalan · Bengaluru, IN
• Vinod Kumar Rai · Bengaluru, IN

Key dates

• Filing date: Mar 31, 2004
• Grant date: Oct 2, 2007
• Expiry date: Dec 17, 2024

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D209/34
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Disclosed herein is a method for producing a 2-hydrocarbyl-3,3-bis(4-hydroxyaryl)phthalimidine. The method comprises forming a reaction mixture comprising at least one substituted or unsubstituted phenolphthalein, at least one substituted or unsubstituted primary hydrocarbyl amine, and an acid catalyst; and heating the reaction mixture to a temperature of less than 180° C. to remove a distillate comprising water and form a crude 2-hydrocarbyl-3,3-bis(4-hydroxyaryl)phthalimidine product; where the 2-hydrocarbyl-3,3-bis(4-hydroxyaryl)phthalimidine has a formula:where R1 is selected from the group consisting of a hydrogen and a hydrocarbyl group, and R2 is selected from the group consisting of a hydrogen, a hydrocarbyl group, and a halogen.