# US 10,869,514 B2 · Acrylic fiber for artificial hair, method for producing same, and head decoration article containing same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,869,514 B2 - Document ID: US10869514B2 - Status: Granted - Kind: B2 - Application number: 16/136,551 - Filed: 2018-09-20 - Published: 2019-01-24 - Granted: 2020-12-22 - Earliest claimed: 2016-03-25 - Assignees: Kaneka Corporation - Applicants: Kaneka Corporation - Inventors: Takeshi Tanaka; Sota Okumura; Tomomichi Hashimoto - Web page: https://patentgrep.com/patent/US10869514B2 ## CPC - A41G 3/0083: {Wigs characterised by their hair filaments} - C08L 27/06: Homopolymers or copolymers of vinyl chloride - D01D 5/06: Wet spinning methods {(D01D5/0046 takes precedence)} - D01F 6/40: Modacrylic fibres, i.e. containing 35 to 85% acrylonitrile - D01F 6/54: of polymers of unsaturated nitriles - C08L 2203/12: used for fibers - D01F 1/07: for making fire- or flame-proof filaments - D10B 2321/101: modacrylic - D10B 2503/08: Wigs - A41G: ARTIFICIAL FLOWERS; WIGS; MASKS; FEATHERS - 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 - 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 Modacrylic fibers for artificial hair include a modacrylic polymer; and a condensed phosphate. The modacrylic polymer includes 29.5 to 79.5% by mass of acrylonitrile, 20 to 70% by mass of vinyl chloride and/or vinylidene chloride, and 0.5 to 5% by mass of a sulfonic acid group containing vinyl monomer, with respect to a total mass of the modacrylic polymer. A content of the condensed phosphate in the modacrylic fibers is 0.05 to 0.57% by mass. ## Claims ### Claim 1 Modacrylic fibers for artificial hair, comprising: a modacrylic polymer; and a condensed phosphate, wherein the modacrylic polymer comprises 29.5 to 79.5% by mass of acrylonitrile, 20 to 70% by mass of vinyl chloride and/or vinylidene chloride, and 0.5 to 5% by mass of a sulfonic acid group-containing vinyl monomer, with respect to a total mass of the modacrylic polymer, and wherein a content of the condensed phosphate in the modacrylic fibers is 0.05 to 0.57% by mass. ### Claim 2 (depends on 1) The modacrylic fibers according to claim 1, wherein a content of phosphorus in the modacrylic fibers is 0.0134 to 0.150% by mass. ### Claim 3 (depends on 1) The modacrylic fibers according to claim 1, wherein the condensed phosphate is at least one compound selected from the group consisting of pyrophosphate, tripolyphosphate, tetrapolyphosphate, trimetaphosphate, and tetrametaphosphate. ### Claim 4 (depends on 3) The modacrylic fibers according to claim 3, wherein the condensed phosphate is tripolyphosphate. ### Claim 5 (depends on 1) The modacrylic fibers according to claim 1, wherein when 0.02 g of the modacrylic fibers are placed in a 20 mL vial and heated at 140° C. for 5 minutes, a concentration of dimethyl sulfide generated in the vial is 10 ppm or less, and a concentration of dimethyl disulfide generated in the vial is 5 ppm or less. ### Claim 6 A method for producing modacrylic fibers for artificial hair, the method comprising: preparing a spinning solution by dissolving a modacrylic polymer in an organic solvent; and wet spinning the spinning solution, wherein the modacrylic polymer comprises 29.5 to 79.5% by mass of acrylonitrile, 20 to 70% by mass of vinyl chloride and/or vinylidene chloride, and 0.5 to 5% by mass of a sulfonic acid group-containing vinyl monomer, with respect to a total mass of the modacrylic polymer, wherein the organic solvent is dimethyl sulfoxide, and wherein the wet spinning comprises at least a coagulation process, a water washing process, and a drying process, and wherein a condensed phosphate is applied to the modacrylic fibers after the water washing process and before the drying process so as to obtain the modacrylic fibers comprising 0.05 to 0.57% by mass of the condensed phosphate. ### Claim 7 (depends on 6) The method according to claim 6, wherein the condensed phosphate is applied with an oil to the modacrylic fibers. ### Claim 8 (depends on 7) The method according to claim 7, wherein a content of phosphorus in the modacrylic fibers is 0.0134 to 0.150% by mass. ### Claim 9 (depends on 7) The method according to claim 7, wherein the condensed phosphate is at least one compound selected from the group consisting of pyrophosphate, tripolyphosphate, tetrapolyphosphate, trimetaphosphate, and tetrametaphosphate. ### Claim 10 (depends on 9) The method according to claim 9, wherein the condensed phosphate is tripolyphosphate. ### Claim 11 (depends on 6) The method according to claim 6, wherein a content of phosphorus in the modacrylic fibers is 0.0134 to 0.150% by mass. ### Claim 12 (depends on 6) The method according to claim 6, wherein the condensed phosphate is at least one compound selected from the group consisting of pyrophosphate, tripolyphosphate, tetrapolyphosphate, trimetaphosphate, and tetrametaphosphate. ### Claim 13 (depends on 12) The method according to claim 12, wherein the condensed phosphate is tripolyphosphate. ### Claim 14 A hair ornament product comprising modacrylic fibers for artificial hair, the modacrylic fibers comprising: a modacrylic polymer; and a condensed phosphate, wherein the modacrylic polymer comprises 29.5 to 79.5% by mass of acrylonitrile, 20 to 70% by mass of vinyl chloride and/or vinylidene chloride, and 0.5 to 5% by mass of a sulfonic acid group-containing vinyl monomer, with respect to a total mass of the modacrylic polymer, and wherein a content of the condensed phosphate in the modacrylic fibers is 0.05 to 0.57% by mass. ### Claim 15 (depends on 14) The hair ornament product according to claim 14, wherein a content of phosphorus in the modacrylic fibers is 0.0134 to 0.150% by mass. ### Claim 16 (depends on 14) The hair ornament product according to claim 14, wherein the condensed phosphate is at least one compound selected from the group consisting of pyrophosphate, tripolyphosphate, tetrapolyphosphate, trimetaphosphate, and tetrametaphosphate. ### Claim 17 (depends on 14) The hair ornament product according to claim 14, wherein the condensed phosphate is tripolyphosphate. ### Claim 18 (depends on 14) The hair ornament product according to claim 14, wherein when 0.02 g of the modacrylic fibers are placed in a 20 mL vial and heated at 140° C. for 5 minutes, a concentration of dimethyl sulfide generated in the vial is 10 ppm or less, and a concentration of dimethyl disulfide generated in the vial is 5 ppm or less. ### Claim 19 (depends on 14) The hair ornament product according to claim 14, 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, toupee, a hair extension, and a hair accessory.