# US 10,477,908 B2 · Acrylic fiber for artificial hair, method for producing same, and head decoration product comprising same

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- Number: US 10,477,908 B2
- Document ID: US10477908B2
- Status: Granted
- Kind: B2
- Application number: 15/717,280
- Filed: 2017-09-27
- Published: 2018-01-18
- Granted: 2019-11-19
- Earliest claimed: 2015-03-30
- Assignees: Kaneka Corporation
- Applicants: Kaneka Corporation
- Inventors: Akihiro Okamoto; Aki Kano; Masato Fujita
- Web page: https://patentgrep.com/patent/US10477908B2

## CPC

- A41G 5/004: {Hairpieces, e.g. hair extensions}
- A41G 3/0083: {Wigs characterised by their hair filaments}
- D01D 5/04: Dry spinning methods {(D01D5/0038 takes precedence)}
- D01D 5/06: Wet spinning methods {(D01D5/0046 takes precedence)}
- D01D 5/38: Formation of filaments, threads, or the like during polymerisation
- D01F 6/38: comprising unsaturated nitriles as the major constituent
- D01F 6/40: Modacrylic fibres, i.e. containing 35 to 85% acrylonitrile
- D01F 11/06: of macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- A41G 3/00: Wigs (for dolls only A63H3/44)
- A41G 5/0006: {Toupées covering a bald portion of the head}
- D10B 2321/101: modacrylic
- D10B 2503/08: Wigs
- A41G: ARTIFICIAL FLOWERS; WIGS; MASKS; FEATHERS
- 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
- D10B: INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES

## Abstract

An acrylic fiber for artificial hair includes an acrylic polymer and an organic solvent that can dissolve the acrylic polymer, wherein the acrylic polymer includes 29.5 to 79.5% by weight of acrylonitrile, 20 to 70% by weight of vinyl chloride and/or vinylidene chloride, and 0.5 to 5% by weight of a sulfonic acid-containing vinyl monomer with respect to a total weight of the acrylic polymer, and wherein a content of the organic solvent in the acrylic fiber is 0.1 to 3% by weight.

## Claims

### Claim 1

An acrylic fiber for artificial hair, comprising an acrylic polymer and an organic solvent that can dissolve the acrylic polymer,
wherein the acrylic polymer comprises, with respect to a total weight of the acrylic polymer, 29.5 to 79.5% by weight of acrylonitrile, 20 to 70% by weight of vinyl chloride and/or vinylidene chloride, and 0.5 to 5% by weight of a sulfonic acid-containing vinyl monomer,
wherein a content of the organic solvent in the acrylic fiber is 0.1 to 3% by weight, and
wherein the acrylic fiber has a single fiber fineness of 30 to 100 dtex.

### Claim 2 (depends on 1)

The acrylic fiber for artificial hair according to claim 1, wherein the organic solvent is at least one selected from the group consisting of acetone, dimethylsulfoxide, N,N-dimethylformamide, dimethylacetamide, dimethylsulfone, ε-caprolactam, ethylene carbonate, and sulfolane.

### Claim 3

A method for producing an acrylic fiber for artificial hair, the method comprising:
extruding a spinning solution through a spinning nozzle to form a yarn;
drawing the yarn to prepare a primary drawn yarn and washing it with water; and
impregnating the water-washed primary drawn yarn with an organic solvent that can dissolve the acrylic polymer so that a content of the organic solvent in the acrylic fiber is 0.1 to 3% by weight,
wherein the spinning solution comprises an acrylic polymer comprising, with respect to a total weight of the acrylic polymer, 29.5 to 79.5% by weight of acrylonitrile, 20 to 70% by weight of vinyl chloride and/or vinylidene chloride, and 0.5 to 5% by weight of a sulfonic acid-containing vinyl monomer, and
wherein the acrylic fiber has a single fiber fineness of 30 to 100 dtex.

### Claim 4 (depends on 3)

The method for producing an acrylic fiber for artificial hair according to claim 3, wherein the impregnating the water-washed primary drawn yarn is performed using a mixture of the organic solvent that can dissolve the acrylic polymer and a finishing oil.

### Claim 5 (depends on 3)

The method for producing an acrylic fiber for artificial hair according to claim 3, wherein the spinning solution is obtained by dissolving the acrylic polymer in one organic solvent selected from the group consisting of acetone, dimethylsulfoxide, N,N-dimethylformamide, and dimethylacetamide.

### Claim 6 (depends on 5)

The method for producing an acrylic fiber for artificial hair according to claim 5, wherein the extruding is performed by extruding the spinning solution into a coagulation liquid through the spinning nozzle; and wherein the drawing is performed by drawing the yarn in an aqueous solution of the organic solvent used for the spinning solution.

### Claim 7 (depends on 1)

A hair ornament product comprising the acrylic fiber for artificial hair according to claim 1.

### Claim 8 (depends on 7)

The hair ornament product according to claim 7, wherein the hair ornament product is at least one selected from the group consisting of a fiber bundle for hair, a weave, a wig, a braid, a toupee, a hair extension, and a hair accessory.