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

US7592464B2 · kind B2 · utility

Assignee

• Sabic Innovative Plastics B.V. · NL

Inventors

• Rajshekhar Basale · Savanuru, IN
• Hyacinth Mary Bastian · Bengaluru, IN
• Balakrishnan Ganesan · Bengaluru, IN
• Venkata Rama Narayanan Ganapathy Bhotla · Bengaluru, IN
• Gurram Kishan · Bengaluru, IN
• Pushpa Narayanan · Savanuru, IN
• Swaminathan Shubashree · Savanuru, IN
• Ravindra Vikram Singh · Sidhauli, IN

Key dates

• Filing date: Mar 30, 2007
• Grant date: Sep 22, 2009
• Expiry date: Jun 27, 2027

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G64/12
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Disclosed herein is a method comprising reacting a phenolphthalein material and a primary hydrocarbyl amine in the presence of an acid catalyst to form a reaction mixture comprising 2-hydrocarbyl-3,3-bis(4-hydroxyaryl)phthalimidine, wherein the phenolphthalein material comprises greater than or equal to 99 weight percent phenolphthalein, based on the total weight of the phenolphthalein material; quenching the reaction mixture and treating the quenched reaction mixture to obtain a first solid. The first solid is purified by a combination of techniques to produce a solid comprising 2-hydrocarbyl-3,3-bis(4-hydroxyaryl)phthalimidine with sufficient purity to be used as a monomer in the synthesis of clear polymers.