Basf Se Corporation

Ciba Specialty Chemicals Corporation

Ciba Corporation

Jianzhao Wang

Paul A Odorisio

Stephen Mark Andrews

Thomas Friend Thompson

Si Wu

Paragkumar Thanki

Deepak M Rane

Delina Joseph

Deepak Rane

Suhas Dattatraya Sahasrabudhe

Preetam Ghogale

Paul Angelo Odorisio

Disclosed are phosphinic acid compounds of formula I, II or III where Rand R' are for instance straight or branched C-Calkyl, Ris for instance straight or branched C-Calkyl, Rand R&#x2032; are for instance straight or branched C-Calkyl, Ris for instance straight or branched C-Calkylene and m is from 2 t 100. Also disclosed are polyester compositions comprising the compounds of formula I, II and III.

Solid state polymerization process for polyester with phosphinic acid compounds

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.

Disclosed is a method for the preparation of a polyester, which 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, where a metal phosphonic acid complex compound of the formula is employed in the first step, in the second step or in both the first and second steps as a reaction catalyst.

Process for producing polyester with metal phosphonic acid complex catalysts

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Yorktown Heights, NY, United States of America

Jianzhao Wang