Patent ID: 8945695
Filing Date: 2015-02-03
Classification: B65D,C08G,C08K,Y10T

Abstract:
1. A polyethylene terephthalate resin containing polyethylene terephthalate (PET), a blue dye in an amount of 0.5 to 2.0 ppm based on the total PET resin weight and inorganic particles of Fe 3 O 4 having a particle size smaller than 1 μm in an amount of ranging from 20 to 250 ppm based on the total PET resin weight, which is produced by following steps: (a) using purified terephthalic acid (PTA) and ethylene glycol (EG) to undergo a direct esterification process and a polycondensation process successively, or selectively further to undergo a solid-state polymerization process to increase an intrinsic viscosity of the PET polymer to 0.70 dl/g or more, (b) before the end of the direct esterification process the blue dye and the inorganic particles of Fe (c) before the beginning of the polycondensation process an inorganic Ti—Mg catalyst having a particle size smaller than 1 μm and a phosphorus compound as a stabilizer added into the reaction tank, wherein the inorganic Ti—Mg catalyst is synthesized by chemical precipitation comprising the following steps: wherein the inorganic Ti—Mg catalyst is added in an amount of ranging from 10 to 100 ppm and the phosphorus compound is added in amount of ranging from 5 to 50 ppm based on the total PET resin weight, and wherein the titanium contained in the Ti—Mg catalyst ranges from 5 to 10 ppm based on the total PET resin weight, and the molar ratio (Ti/Mg) of titanium (Ti) to magnesium (Mg) ranges from about 0.005 to 0.25.