Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Reexamination Certificate
2009-03-31
2011-10-04
Boykin, Terressa (Department: 1765)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
C502S150000, C502S208000, C528S271000, C528S272000, C528S275000, C528S279000
Reexamination Certificate
active
08030435
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-C4dicarboxylic 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.
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English Language Abstract of JP2002293909 from Esp@cenet website printed on Jul. 8, 2009.
Andrews Stephen M.
Joseph Delina
Odorisio Paul
Rane Deepak M.
Thanki Paragkumar
Boykin Terressa
Ciba Corporation
Stevenson Tyler A.
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