# US 7,612,000 B2 · Modacrylic shrinkable fiber and method for manufacturing the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,612,000 B2 - Document ID: US7612000B2 - Status: Granted - Kind: B2 - Application number: 11/632,604 - Filed: 2005-07-08 - Published: 2007-10-18 - Granted: 2009-11-03 - Earliest claimed: 2004-07-16 - Assignees: Kaneka Corporation - Inventors: Sohei Nishida; Kohei Kawamura; Toshiaki Ebisu - Web page: https://patentgrep.com/patent/US7612000B2 ## CPC - D01F 6/54: of polymers of unsaturated nitriles - C08F 220/14: Methyl esters {, e.g. methyl (meth)acrylate} - C08F 228/02: by a bond to sulfur - D01F 6/48: of polymers of halogenated hydrocarbons - C08F 220/44: Acrylonitrile - C08F 220/585: {and containing other heteroatoms, e.g. 2-acrylamido-2-methylpropane sulfonic acid [AMPS]} - Y10T 428/2913: Rod, strand, filament or fiber - Y10T 428/2929: Bicomponent, conjugate, composite or collateral fibers or filaments [i.e., coextruded sheath-core or side-by-side type] - Y10T 428/2931: Fibers or filaments nonconcentric [e.g., side-by-side or eccentric, etc.] - Y10T 442/64: Islands-in-sea multicomponent strand or fiber material - D01F: CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS - C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A modacrylic shrinkable fiber according to the present invention is containing a polymer composition obtained by mixing 50 to 99 parts by weight of a polymer (A) containing 40 wt % to 80 wt % of acrylonitrile, 20 wt % to 60 wt % of a halogen-ontaining monomer and 0 wt % to 5 wt % of a sulfonic-acid-containing monomer, and 1 to 50 parts by weight of a polymer (B) containing 5 wt % to 70 wt % of acrylonitrile, 20 wt % to 94 wt % of an acrylic ester and 1 wt % to 40 wt % of a sulfonic-acid-containing monomer containing a methallylsulfonic acid or metal salts thereof or amine salts thereof, in which a total amount of the polymer (A) and the polymer (B) is 100 parts by weight. In this way, a modacrylic shrinkable fiber that has a favorable color development property after dyeing and a high shrinkage ratio even after dyeing is obtained. ## Claims ### Claim 1 A modacrylic shrinkable fiber manufactured from a spinning solution comprising a polymer composition obtained by mixing 50 to 99 parts by weight of a polymer (A) comprising 40 wt % to 80 wt % of acrylonitrile, 20 wt % to 60 wt % of a halogen-containing monomer and 0 wt % to 5 wt % of a sulfonic-acid-containing monomer, and 1 to 50 parts by weight of a polymer (B) comprising 5 wt % to 70 wt % of acrylonitrile, 20 wt % to 94 wt % of an acrylic ester and 16 wt % to 40 wt % of a sulfonic-acid-containing monomer comprising a methallylsulfonic acid or metal salts thereof or amine salts thereof, and no halogen-containing monomer; a total amount of the polymer (A) and the polymer (B) being 100 parts by weight; wherein the modacrylic shrinkable fiber is capable of being dyed in deep colors at a temperature equal to or lower than 80° C. and achieving a post-dyeing shrinkage ratio treated in dry heat at 130° C. for 5 minutes of equal to or larger than 20%. ### Claim 2 (depends on 1) The modacrylic shrinkable fiber according to claim 1, wherein the methallylsulfonic acid or the metal salts thereof or the amine salts thereof in the polymer (B) is sodium methallylsulfonate. ### Claim 3 (depends on 1) The modacrylic shrinkable fiber according to claim 1, which comprises 0.01 wt % to 10 wt % of sodium methallylsulfonate in the polymer (B). ### Claim 4 (depends on 1) The modacrylic shrinkable fiber according to claim 1, which comprises 0.1 wt % to 3 wt % of sodium methallylsulfonate in the polymer (B). ### Claim 5 (depends on 1) The modacrylic shrinkable fiber according to claim 1, wherein a relative saturation value at 70° C. is at least 0.8. ### Claim 6 (depends on 1) The modacrylic shrinkable fiber according to claim 1, wherein the polymer (A) and the polymer (B) are incompatible with each other and have a sea-island structure with the polymer (A) being the sea and the polymer (B) being the islands. ### Claim 7 A method for manufacturing a modacrylic shrinkable fiber, wherein spinning is performed using a spinning solution obtained by dissolving in acetone 50 to 99 parts by weight of a polymer (A) comprising 40 wt % to 80 wt % of acrylonitrile, 20 wt % to 60 wt % of a halogen-containing monomer and 0 wt % to 5 wt % of a sulfonic-acid-containing monomer, and 1 to 50 parts by weight of a polymer (B) comprising 5 wt % to 70 wt % of acrylonitrile, 20 wt % to 94 wt % of an acrylic ester and 16 wt % to 40 wt % of a sulfonic-acid-containing monomer comprising a methallylsulfonic acid or metal salts thereof or amine salts thereof, and no halogen-containing monomer; a total amount of the polymer (A) and the polymer (B) being 100 parts by weight; drawing is performed, and dyeing is performed at a temperature equal to or lower than 80° C., thus obtaining a modacrylic shrinkable fiber having a post-dyeing shrinkage ratio being treated in dry heat at 130° C. for 5 minutes of equal to or larger than 20%. ### Claim 8 (depends on 7) The method for manufacturing a modacrylic shrinkable fiber according to claim 7, wherein water is dissolved further in the acetone. ### Claim 9 (depends on 1) The modacrylic shrinkable fiber according to claim 1, wherein 1 wt % to 40 wt % of the sulfonic-acid-containing monomer comprising the methallylsulfonic acid or the metal salts thereof or the amine salts thereof in the polymer (B) comprises (a) at least one sulfonic-acid-containing monomer selected from the group consisting of a methallylsulfonic acid, metal salts thereof and amine salts thereof and (b) at least one sulfonic-acid-containing monomer selected from the group consisting of an allylsulfonic acid, a styrenesulfonic acid, an isoprenesulfonic acid and a 2-acrylamido-2-methylpropanesulfonic acid, and metal salts thereof and amine salts thereof, the content of (a) is 0.01 wt % to 10 wt %, and the content of (a)+(b) is 1 wt % to 40 wt %. ### Claim 10 (depends on 1) The modacrylic shrinkable fiber according to claim 1, wherein 1 wt % to 40 wt % of the sulfonic-acid-containing monomer comprising the methallylsulfonic acid or the metal salts thereof or the amine salts thereof in the polymer (B) comprises (a) 0.01 wt % to 10 wt % of a methallylsulfonic acid, and (b) 15 wt % to 30 wt % of a 2-acrylamido-2-methlylproanesulfonic acid. ### Claim 11 (depends on 7) The method for manufacturing a modacrylic shrinkable fiber according to claim 7, wherein 1 wt % to 40 wt % of the sulfonic-acid-containing monomer comprising the methallylsulfonic acid or the metal salts thereof or the amine salts thereof in the polymer (B) comprises (a) at least one sulfonic-acid-containing monomer selected from the group consisting of a methallylsulfonic acid, metal salts thereof and amine salts thereof, and (b) at least one sulfonic-acid-containing monomer selected from the group consisting of an allylsulfonic acid, a styrenesulfonic acid, an isoprenesulfonic acid and a 2-acrylamido-2-methylpropanesulfonic acid, and metal salts thereof and amine salts thereof, the content of (a) is 0.01 wt % to 10 wt %, and the content of (a)+(b) is 1 wt % to 40 wt %. ### Claim 12 (depends on 7) The method for manufacturing a modacrylic shrinkable fiber according to claim 7, wherein 1 wt % to 40 wt % of the sulfonic-acid-containing monomer comprising the methallylsulfonic acid or the metal salts thereof or the amine salts thereof in the polymer (B) comprises (a) 0.01 wt % to 10 wt % of a methallylsulfonic acid, and (b) 15 wt % to 30 wt % of a 2-acrylamido-2-methylpropanesulfonic acid.