The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 04, 2011
Filed:
Mar. 31, 2009
Paul Odorisio, Leonia, NJ (US);
Stephen M. Andrews, New Fairfield, CT (US);
Thomas F. Thompson, Highland Mills, NY (US);
SI Wu, Ossining, NY (US);
Paragkumar Thanki, Maharashtra, IN;
Deepak M. Rane, Maharashtra, IN;
Delina Joseph, Maharashtra, IN;
Jianzhao Wang, Yorktown Heights, NY (US);
Paul Odorisio, Leonia, NJ (US);
Stephen M. Andrews, New Fairfield, CT (US);
Thomas F. Thompson, Highland Mills, NY (US);
Si Wu, Ossining, NY (US);
Paragkumar Thanki, Maharashtra, IN;
Deepak M. Rane, Maharashtra, IN;
Delina Joseph, Maharashtra, IN;
Jianzhao Wang, Yorktown Heights, NY (US);
Ciba Corporation, Tarrytown, NY (US);
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 C-Cdicarboxylic 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.