Process for producing polyester with metal phosphonic acid complex catalysts

US7678878B2 · kind B2 · utility

Assignee

• Ciba Specialty Chemicals Corporation · US

Inventors

• Stephen Mark Andrews · New Fairfield, US
• Jianzhao Wang · Yorktown Heights, US
• Thomas F. Thompson · Highland Mills, US
• Paragkumar Thanki · Jamkhed, IN
• Deepak Rane · Mumbai, IN
• Suhas Dattatraya Sahasrabudhe · Jamkhed, IN
• Preetam Ghogale · Mumbai, IN
• Paul A. Odorisio · Leonia, US
• Si Wu · Ossining, US

Key dates

• Filing date: Jan 27, 2009
• Grant date: Mar 16, 2010
• Expiry date: Jan 27, 2029

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G63/189
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Disclosed is a method for the preparation of a polyester, which method comprises in a first step, reacting a dicarboxylic acid or a C1-C4 dicarboxylic diester with a diol at a suitable temperature and pressure to effect esterification or transesterification to prepare a precondensate and in a second step, reacting the precondensate to effect polycondensation at a suitable temperature and pressure to prepare a high molecular weight polyester, where a metal phosphonic acid complex compound of the formulais employed in the first step, in the second step or in both the first and second steps as a reaction catalyst.