Patent ID: 7473755
Filing Date: 2009-01-06
Classification: B29B,B29C,B29K,B29L,C08G,Y10T

Abstract:
1. Polyester resin comprising at least 85 Mol-% of polyethylene terephthalate and at least 0.01 Mol-%, but not more than 5.00 Mol-% of units of the formula (I) wherein wherein n is an integer from 3 to 10 and wherein M + is an alkali metal ion, earth alkali metal ion, phosphonium ion or ammonium ion and wherein the polyester contains <5.0 wt.-% of diethylene glycol and wherein the polyester contains Na 2 HPO 4 in an amount such that the phosphor content is 10 to 200 ppm (based on the weight of the polyester) and wherein the polyester is either free of or does not contain more than 9 ppm of NaH 2 PO 4, and wherein the intrinsic viscosity is 0.6 to 1.0.