Patent ID: 6710158
Filing Date: 2004-03-23
Classification: B29K,C08G,C08J,C08K,Y10T

Abstract:
A method for making polyethylene terephthalate resin that can be formed into high-clarity bottles possessing reduced coefficient of friction, comprising:reacting a terephthalate component and a diol component to form polyethylene terephthalate precursors; polymerizing the polyethylene terephthalate precursors via melt phase polycondensation to form polymers of polyethylene terephthalate; and thereafter introducing into the polyethylene terephthalate polymers a reactive carrier having a molecular weight of less than about 10,000 g/mol, the reactive carrier being the delivery vehicle for between about 20 and 200 ppm of an inert particulate additive that is capable of reducing the coefficient of friction in bottles formed from the polyethylene terephthalate polymers; wherein the inert particulate additive is selected from the group consisting of talc and calcium carbonate; and wherein the inert particulate additive has an average particle size of less than about ten microns.