Solid state polymerization process for polyester with phosphinic acid compounds

US8258253B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

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

Key dates

• Filing date: Aug 22, 2011
• Grant date: Sep 4, 2012
• Expiry date: Aug 22, 2031

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G63/87
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Disclosed is a method for increasing the solid state polymerization (SSP) rates of metal catalyzed polyesters. The 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 and in a third step, further increasing the molecular weight and viscosity of the polyester under SSP conditions of a suitable temperature and pressure, where a metal catalyst is added in the first step or in the second step as a reaction catalyst, and where a certain phosphinic acid compound is added in the first step, in the second step or just prior to the third step. The polyester product exhibits low aldehyde formation during melt processing steps as well as excellent color.