Manufacturing method of polyethylene terephthalate
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United States of America Patent
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Dec 31, 2013
Grant Date -
May 28, 2009
app pub date -
Apr 5, 2007
filing date -
Apr 6, 2006
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Abstract
A manufacturing method of polyethylene terephthalate including a step of melt polycondensation in presence of polycondensation catalyst represented by general Formula (I), wherein R1 represents an alkyl group having from 2 to 12 carbon atoms, and melt polycondensed polyethylene terephthalate has an intrinsic viscosity of from 0.48 to 0.53 dL/g and a terminal carboxyl number of from 14 to 22 mmol/kg; and a step of solid phase polycondensation to obtain solid phase polycondensed polyethylene terephthalate having an intrinsic viscosity of from 0.70 to 0.86 dL/g, and a terminal carboxyl number of less than 15 mmol/kg, followed by a step of applying an aqueous solution of at least one salt selected from the group consisting of acetate, carbonate, and sulfate of sodium, potassium, or cesium to the solid phase polycondensed polyethylene terephthalate, and then drying the polyethylene terephthalate, wherein the final content of sodium, potassium or cesium atom in dried polyethylene terephthalate is from 2 to 25 ppm.
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