# US 9,752,258 B2 · Cationic-dyeable polyester fiber and conjugated fiber

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- Number: US 9,752,258 B2
- Document ID: US9752258B2
- Status: Granted
- Kind: B2
- Application number: 14/000,779
- Filed: 2012-02-17
- Published: 2013-12-05
- Granted: 2017-09-05
- Earliest claimed: 2011-02-21
- Assignees: Kuraray Co., Ltd.
- Applicants: Hitoshi Nakatsuka; Kazuhiko Tanaka; Kazuhide Oka; Daisuke Ohga; Shinya Kawakado
- Inventors: Hitoshi Nakatsuka; Kazuhiko Tanaka; Kazuhide Oka; Daisuke Ohga; Shinya Kawakado
- Web page: https://patentgrep.com/patent/US9752258B2

## CPC

- D02G 3/36: Cored or coated yarns or threads ({D02G3/34, D02G3/40 take precedence}; elastic yarns or threads D02G3/32)
- C08G 63/6886: {Dicarboxylic acids and dihydroxy compounds}
- D01D 5/34: Core-skin structure; Spinnerette packs therefor
- D01F 6/84: from copolyesters
- D01F 8/10: with at least one other macromolecular compound obtained by reactions only involving carbon-to-carbon unsaturated bonds as constituent
- D01F 8/14: with at least one polyester as constituent
- D01D 5/253: with a non-circular cross section; Spinnerette packs therefor (D01D5/38 takes precedence)
- Y10T 428/2929: Bicomponent, conjugate, composite or collateral fibers or filaments [i.e., coextruded sheath-core or side-by-side type]
- D02G: CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- D01D: MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01F: CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A fiber made of a polyester copolymer (B), wherein the polyester copolymer (B) comprises a dicarboxylic acid component and a glycol component, and the dicarboxylic acid component comprises 75 mol % or more of a terephthalic acid component, 1.0 mol % to 3.5 mol % of component (a) derived from a compound represented by formula (I), 2.0 mol % to 10.0 mol % of a cyclohexane dicarboxylic acid component (b), and 2.0 mol % to 8.0 mol % of an aliphatic dicarboxylic acid component (c). This can afford a polyester fiber that exhibits deep color property to cation dyes and disperse dyes under a normal pressure environment and is superior in color fastness to washing and color fastness to light and can secure good spinnability.

## Claims

### Claim 1

A yarn comprising fibers consisting of:
a polyester copolymer;
wherein:
the polyester copolymer consists of a dicarboxylic acid component and a glycol component;
the dicarboxylic acid component comprises:
75 mol % or more of a component derived from terephthalic acid;
from 1.0 mol % to 3.5 mol % of a component derived from a compound represented by formula (I):
from 2.0 mol % to 10.0 mol % of a component derived from a cyclohexane dicarboxylic acid; and
from 2.0 mol % to 8.0 mol % of a component derived from an aliphatic dicarboxylic acid;
R represents hydrogen, an alkyl group having from 1 to 10 carbon atoms, or a 2-hydroxyethyl group;
X represents a metal ion, a quaternary phosphonium ion, or a quaternary ammonium ion;
the glycol component consists of a component derived from ethylene glycol;
breakage of the yarn occurs at a frequency of once or not at all during spinning, when spinning is carried out at an output per hole of 1.57 g/min, using a spinneret with 24 holes having a hole diameter of 0.20 mmφ, continuously for 24 hours; and
a degree of exhaustion of the fibers is at least 80% at 90° C. and at least 85% at 95° C.

### Claim 2

A yarn comprising conjugated fibers consisting of:
a polyester copolymer; and
an ethylene-vinyl alcohol-based copolymer comprising from 25 to 60 mol % of a component derived from ethylene;
wherein:
the polyester copolymer consists of a dicarboxylic acid component and a glycol component;
the dicarboxylic acid component comprises:
75 mol % or more of a component derived from terephthalic acid;
from 1.0 mol % to 3.5 mol % of a component derived from a compound represented by formula (I):
from 2.0 mol % to 10.0 mol % of a component derived from a cyclohexane dicarboxylic acid; and
from 2.0 mol % to 8.0 mol % of a component derived from an aliphatic dicarboxylic acid;
the ethylene-vinyl alcohol-based copolymer is exposed on at least a portion of a surface of the conjugated fiber;
R represents hydrogen, an alkyl group having from 1 to 10 carbon atoms, or a 2-hydroxyethyl group;
X represents a metal ion, a quaternary phosphonium ion, or a quaternary ammonium ion;
the glycol component consists of a component derived from ethylene glycol;
breakage of the yarn occurs at a frequency of once or not at all during spinning, when spinning is carried out at an output per hole of 1.57 g/min, using a spinneret with 24 holes having a hole diameter of 0.20 mmφ, continuously for 24 hours; and
a degree of exhaustion of the fibers is at least 80% at 90° C. and at least 85% at 95° C.

### Claim 3 (depends on 2)

The yarn according to claim 2, wherein:
the polyester copolymer comprises four or more projections at an interface with the ethylene-vinyl alcohol-based copolymer in a cross sectional configuration of the conjugated fiber;
a major axis of each of the four or more projections has an angle of 90°±15° with respect to a cross sectional circumference of the conjugated fiber;
a ratio of a circumferential length (L2) of the polyester copolymer to a circumferential length (L1) of the conjugated fiber satisfies 1.6≦X/C;
X is the ratio (L2/L1) of the circumferential length of the polyester copolymer to the circumferential length of the conjugated fiber; and
C is a mass conjugation ratio of the polyester copolymer where a whole conjugated fiber is taken as 1.

### Claim 4 (depends on 3)

The yarn according to claim 3, wherein:
the polyester copolymer comprises ten or more projections at the interface; and
an interval between neighboring projections is 1.5 μm or less.

### Claim 5 (depends on 2)

The yarn according to claim 2, wherein a mass conjugation ratio of the ethylene-vinyl alcohol-based copolymer to the polyester copolymer is from 10:90 to 90:10.

### Claim 6 (depends on 2)

The yarn according to claim 2, wherein the dicarboxylic acid component comprises:
75 mol % or more of the component derived from terephthalic acid;
from 1.0 mol % to 3.5 mol % of the component derived from the compound represented by formula (I);
from 3.0 mol % to 8.0 mol % of the component derived from the cyclohexane dicarboxylic acid; and
from 2.0 mol % to 8.0 mol % of the component derived from the aliphatic dicarboxylic acid.