# US 12,180,618 B2 · Dyeable polyolefin fiber and fibrous structure comprising same

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- Number: US 12,180,618 B2
- Document ID: US12180618B2
- Status: Granted
- Kind: B2
- Application number: 16/960,175
- Filed: 2019-01-10
- Published: 2021-02-25
- Granted: 2024-12-31
- Earliest claimed: 2018-01-18
- Assignees: Toray Industries, Inc.
- Applicants: Toray Industries, Inc.
- Inventors: Hidekazu Kano; Masashi Nagao; Katsuhiko Mochizuki
- Web page: https://patentgrep.com/patent/US12180618B2

## CPC

- D01F 8/06: with at least one polyolefin as constituent
- C08L 23/12: Polypropene
- C08L 67/02: Polyesters derived from dicarboxylic acids and dihydroxy compounds (C08L67/06 takes precedence)
- D01D 5/08: Melt spinning methods {(D01D5/0023 takes precedence)}
- D01D 5/34: Core-skin structure; Spinnerette packs therefor
- D01F 1/10: Other agents for modifying properties
- D01F 6/46: of polyolefins
- D01F 6/92: of polyesters
- D01F 8/14: with at least one polyester as constituent
- C08G 63/08: Lactones or lactides
- C08G 63/181: Acids containing aromatic rings
- C08G 63/183: Terephthalic acids
- C08G 63/187: containing condensed aromatic rings
- C08G 63/672: Dicarboxylic acids and dihydroxy compounds
- C08L 67/025: {containing polyether sequences}
- C08L 67/04: Polyesters derived from hydroxycarboxylic acids, e.g. lactones (C08L67/06 takes precedence)
- D01F: CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- D01D: MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS

## Abstract

A dyeable polyolefin fiber is a polymer alloy fiber having a sea-island structure in which the sea ingredient comprises a polyolefin (A) and the island ingredient comprises a polyester (B), the fiber having a degree of elongation of 10-80%. The polyester (B) in the dyeable polyolefin fiber has an orientation parameter, as determined by Raman spectroscopy, of 1.1-10.0. The dyeable polyolefin fiber is a highly lightweight polyolefin fiber capable of being brightly and deeply colored, is excellent in terms of color fastness and evenness in dyeing, and is suitable for use as a fibrous structure.

## Claims

### Claim 1

A dyeable polyolefin fiber comprising a polymer alloy fiber having a sea-island structure comprising a polyolefin (A) as a sea component and a polyester (B) as an island component and having a degree of elongation of 10 to 80%, wherein the polyester (B) in the dyeable polyolefin fiber has an orientation parameter, as determined by Raman spectroscopy, of 1.1 to 10.0, and
a melt viscosity ratio (ηB/ηA) of a melt viscosity (ηA(Pa·s)) of the polyolefin (A) as the sea component and a melt viscosity (ηB (Pa·s)) of the polyester (B) as the island component is 1.0 to 5.0, and
the polyester (B) is a copolyester.

### Claim 2 (depends on 1)

The dyeable polyolefin fiber according to claim 1, wherein the polyester (B) in the dyeable polyolefin fiber has a crystallinity, as determined by Raman spectroscopy, of 1 to 40%.

### Claim 3 (depends on 1)

The dyeable polyolefin fiber according to claim 1, wherein a main constituent component of the polyester (B) is a dicarboxylic acid component (B1) and a diol component (B2), the dicarboxylic acid component (B1) is at least one dicarboxylic acid component (B1) selected from an aliphatic dicarboxylic acid (B1-1), an alicyclic dicarboxylic acid (B1-2) and an aromatic dicarboxylic acid (B1-3).

### Claim 4 (depends on 3)

The dyeable polyolefin fiber according to claim 3, wherein the diol component (B2) is at least one diol component (B2) selected from an aliphatic diol (B2-1), an alicyclic diol (B2-2) and an aromatic diol (B2-3).

### Claim 5 (depends on 1)

The dyeable polyolefin fiber according to claim 1, wherein a main constituent component of the polyester (B) is at least one selected from the group consisting of an aliphatic oxycarboxylic acid, an alicyclic oxycarboxylic acid, and an aromatic oxycarboxylic acid.

### Claim 6 (depends on 1)

A fibrous structure at least partly comprising the dyeable polyolefin fiber according to claim 1.