Method of producing liquid crystal polyester fibers

Patent metadata

Field	Value
Publication number	US-10584429-B2
Application number	US-201816017205-A
Country	US
Kind code	B2
Filing date	Jun 25, 2018
Priority date	Mar 29, 2011
Publication date	Mar 10, 2020
Grant date	Mar 10, 2020

Abstract

A method of producing a liquid crystalline polyester fiber includes subjecting a yarn prepared by melt spinning a liquid crystalline polyester to a solid-phase polymerization after applying inorganic particles (A) and a phosphate-based compound (B) to the yarn. The method can optionally include cleaning the liquid crystalline polyester fiber after the solid-phase polymerization.

First claim

The invention claimed is:

1. A method of producing a liquid crystalline polyester fiber comprising: subjecting a yarn prepared by melt spinning a liquid crystalline polyester to a solid-phase polymerization after applying inorganic particles (A) and a phosphate-based compound (B) to said yarn, and
cleaning said liquid crystalline polyester fiber after said solid-phase polymerization.

2. The method according to claim 1 , further comprising carrying out a high temperature heat treatment at a temperature of an endothermic peak temperature (Tm 1 ) of said liquid crystalline polyester fiber after said cleaning +10° C. or higher.

3. The method according to claim 1 , wherein said inorganic particles (A) are one or more selected from silica and silicates.

4. The method according to claim 1 , wherein said phosphate-based compound (B) comprises any of compounds represented by Formulae (1) to (3) or a combination thereof, and satisfies Conditions 1 to 4:

Condition 1: R 1 and R 2 represent a hydrocarbon group;
Condition 2: M 1 represents an alkali metal;
Condition 3: M 2 represents a group selected from an alkali metal, a hydrogen atom, a hydrocarbon group and a hydrocarbon group containing an oxygen atom(s);
Condition 4: n represents an integer of 1 or more.

5. The method according to claim 1 , wherein the inorganic particles (A) are applied to the yarn at an adhesion rate of the inorganic particles and the phosphate-based compound of 15-30 wt %.

Assignees

• Toray Industries

Inventors

• Kawamata Chieko
• Ono Yusuke
• Katsuta Hiroo
• Funatsu Yoshitsugu

Classifications

• D06M23/08

  Processes in which the treating agent is applied in powder or granular form (adhesives for multi-layer textile fabrics D06M17/00) · CPC title

• D01F6/84

  from copolyesters · CPC title

• D06M2101/32

  Polyesters · CPC title

• D06M13/292

  Mono-, di- or triesters of phosphoric or phosphorous acids; Salts thereof · CPC title

• C08G63/40

  Polyesters derived from ester-forming derivatives of polycarboxylic acids or of polyhydroxy compounds, other than from esters thereof · CPC title