Flame-retardant polyester fiber with excellent dyeability and manufacturing method therefor

Patent metadata

Field	Value
Publication number	US-12522951-B2
Application number	US-202118017600-A
Country	US
Kind code	B2
Filing date	Jul 21, 2021
Priority date	Jul 23, 2020
Publication date	Jan 13, 2026
Grant date	Jan 13, 2026

Abstract

The present invention relates to a flame-retardant polyester fiber manufactured by using a titanium-based catalyst and an additive-type flame retardant, and relates to a flame-retardant polyester fiber with excellent dyeability characterized by generating a small amount of acetaldehyde, with excellent dyeability, and generating remarkably low contamination on a nozzle surface, and to a manufacturing method therefor.

First claim

The invention claimed is:

1 . A flame-retardant polyester fiber with excellent dyeability that is a polyester fiber stretched from a spinning product of a flame-retardant polyester resin comprising 5.0 to 7.0 wt % of an additive-type flame retardant represented by Chemical Formula 1 below and a remainder of a polymerization product,
wherein the polymerization product is a polymerization product of a polymerization reactant comprising an ester reactant, a heat stabilizer, and a titanium-based catalyst represented by Chemical Formula 2 below, wherein the additive-type flame retardant has an average molecular weight of 5,000 to 11,000, wherein the polyester fiber comprises:
10 to 20 ppm of titanium (Ti) element in the fiber; and
an additive-type flame retardant represented by Chemical Formula 1 below in an amount of 0.55 to 0.75 wt. % based on the amount of phosphorus (P) element in 100 wt. % of the fiber,
wherein the polyester fiber has a limiting oxygen index (LOI) of 30% or more as measured according to the KS M 3032 method, and wherein the fiber has a strength of 3.6 to 6.0 g/de:

wherein in Chemical Formula 1 above, R is an alkylene group having 1 to 5 carbon atoms, n is an integer of 1 to 20, and m is an integer of 1 to 80;

wherein in Chemical Formula 2 above, R 1 and R 2 are each independently a straight-chain alkylene group having 1 to 5 carbon atoms or a branched alkylene group having 3 to 5 carbon atoms.

2 . The flame-retardant polyester fiber of claim 1 , wherein the fiber has b* of 1.0 to 2.5 when chromaticity coordinates are calculated by using a CIE standard light source and a standard observer.

3 . The flame-retardant polyester fiber of claim 1 , wherein the fiber has an acetaldehyde generation amount of 400 ppb or less as measured through a gas detection tube.

4 . A method for manufacturing a flame-retardant polyester fiber with excellent dyeability, comprising:
step 1 of obtaining an ester reactant by reacting an acid component and a diol component; step 2 of preparing a polymerization product by mixing and reacting a polymerization reactant comprising the ester reactant, a heat stabilizer and a titanium-based catalyst represented by Chemical Formula 2 below; step 3 of removing impurities from the polymerization product; step 4 of preparing a flame-retardant polyester resin by mixing the polymerization product obtained in step 3 and an additive-type flame retardant represented by Chemical Formula 1 below; step 5 of producing a spinning product by spinning the flame-retardant polyester resin; and step 6 of stretching the spinning product to manufacture a flame-retardant polyester fiber, wherein the additive-type flame retardant has an average molecular weight of 5,000 to 11,000, and is comprised in an amount of 5.0 to 7.0 wt. % based on the total weight of the flame-retardant polyester resin, wherein the flame-retardant polyester fiber in step 6 comprises 10 to 20 ppm of titanium (Ti) element in the fiber and 0.55 to 0.75 wt % of phosphorus (P) element based on 100 wt % of the fiber, wherein the flame-retardant polyester fiber has a limiting oxygen index (LOI) of 30% or more as measured according to the KS M 3032 method, and wherein the fiber has a strength of 3.6 to 6.0 g/de:

wherein in Chemical Formula 1 above, R is an alkylene group having 1 to 5 carbon atoms, n is an integer of 1 to 20, and m is an integer of 1 to 80,

wherein in Chemical Formula 2 above, R 1 and R 2 are each independently a straight-chain alkylene group having 1 to 5 carbon atoms or a branched alkylene group having 3 to 5 carbon atoms.

5 . The method of claim 4 , wherein the titanium-based catalyst comprises 200 to 400 ppm of a catalyst based on the total weight of the polymerization reactant.

Assignees

• Toray Advanced Mat Korea Inc

Inventors

• Lim Seong Su

Classifications

• D10B2401/14

  Dyeability · CPC title

• D10B2401/063

  high strength · CPC title

• D10B2331/04

  polyesters, e.g. polyethylene terephthalate [PET] · CPC title

• D01F6/62 Primary

  from polyesters · CPC title

• D01D5/098

  with simultaneous stretching · CPC title