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

US7514524B2 · kind B2 · utility

Assignee

• Sabic Innovative Plastics B.V. · NL

Inventors

• Rajshekhar Basale · Savanuru, IN
• Balakrishnan Ganesan · Bengaluru, IN
• Venkata Rama Narayanan Ganapathy Bholta · Bengaluru, IN
• Gurram Kishan · Bengaluru, IN
• Surendra Kulkarni · Mumbai, IN
• Pradeep Nadkarni · Bengaluru, IN
• Suresh Shanmugam · Bengaluru, IN
• Ravindra Vikram Singh · Sidhauli, IN

Key dates

• Filing date: Mar 30, 2007
• Grant date: Apr 7, 2009
• Expiry date: Jun 5, 2027

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D209/46
• 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 95 weight percent phenolphthalein, based on the total weight of phenolphthalein material; quenching the reaction mixture and treating the quenched reaction mixture to obtain a first solid. The first solid is then triturated with a trituration solvent and washed to obtain a second solid, wherein the second solid comprises greater than or equal to 97 weight percent 2-hydrocarbyl-3,3-bis(4-hydroxyaryl)phthalimidine, based on the total weight of the second solid. The second solid may be polymerized to form a polycarbonate.