POLYESTER INDUSTRY FILAMENT FOR INDUSTRIAL SEWING THREAD AND PREPARATION METHOD THEREOF

WIPO Patent Application WO/2020/134499

A1

The invention relates to a polyester industry filament for an industrial sewing thread and a preparation method thereof. A modified polyester melt is subjected to solid phase polycondensation and viscosification, and a spinning process, so as to prepare a polyester industry filament for an industrial sewing thread. A method for preparing the modified polyester prior to the solid phase polycondensation and viscosification comprises: evenly mixing terephthalic acid, ethylene glycol, dibasic acid having a pendant tertiary-butyl group, dihydric alcohol having a pendant trimethylsilicon group, and Sb2O3 powder doped with and modified by a metal oxide, and then sequentially performing an esterification reaction and a condensation reaction. The dibasic acid having the pendant tertiary-butyl group is 5-tertiary-butyl-1,3-phthalic acid, 2-tertiary-butyl-1,6-adipic acid, 3-tertiary-butyl-1,6-adipic acid or 2,5-di-tert-butyl-1,6-adipic acid. The prepared polyester industry filament has a high dyeing rate and K/S value. The method of the invention is a simple process, and the polyester industry filament prepared thereby has good dyeability.

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FAN HONGWEI (CN)
WANG SHANSHUI (CN)
WANG LILI (CN)

PCT/CN2019/113889

July 02, 2020

October 29, 2019

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JIANGSU HENGLI CHEMICAL FIBRE CO LTD (CN)

C08G63/695; D01F6/92; C08G63/86; D01D5/08; D01D5/088; D01D5/16; D01D10/02; D01F1/10

CN109735937A	2019-05-10
CN109735955A	2019-05-10
CN108385189A	2018-08-10
US3407112A	1968-10-22

TONGSHE INTELLECTUAL PROPERTY AGENCY (CN)

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