Abstract: A flame retardant synthetic fiber and a flame retardant fiber composite that satisfy high flame retardance and high fire resistance, a method for producing the flame retardant synthetic fiber and the flame retardant fiber composite, and a textile product are provided. The flame retardant synthetic fiber of the present invention includes a polymer (1) containing 30 to 70 parts by mass of acrylonitrile, 70 to 30 parts by mass of a halogen-containing vinylidene monomer and/or a halogen-containing vinyl monomer, and 0 to 10 parts by mass of a vinyl-based monomer copolymerizable therewith, based on 100 parts by mass of the polymer, and at least one kind of a metal compound (2) that accelerates a dehalogenation reaction of the polymer (1) during burning and a carbonization reaction of the polymer (1) during burning, wherein the flame retardant synthetic fiber has a shrinkage variation of 45% or less when a temperature is raised from 50° C. to 300° C. under a load of 0.0054 mN/dtex.

Abstract: A flame retardant synthetic fiber and a flame retardant fiber composite that satisfy high flame retardance and high fire resistance, a method for producing the flame retardant synthetic fiber and the flame retardant fiber composite, and a textile product are provided. The flame retardant synthetic fiber of the present invention includes a polymer (1) containing 30 to 70 parts by mass of acrylonitrile, 70 to 30 parts by mass of a halogen-containing vinylidene monomer and/or a halogen-containing vinyl monomer, and 0 to 10 parts by mass of a vinyl-based monomer copolymerizable therewith, based on 100 parts by mass of the polymer, and at least one kind of a metal compound (2) that accelerates a dehalogenation reaction of the polymer (1) during burning and a carbonization reaction of the polymer (1) during burning, wherein the flame retardant synthetic fiber has a shrinkage variation of 45% or less when a temperature is raised from 50° C. to 300° C. under a load of 0.0054 mN/dtex.

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.

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.

Abstract: A flame resistant synthetic fiber having advanced flame resistance is provided. Furthermore, the flame resistant synthetic fiber may preferably be used in textiles used for furniture, such as beddings and chairs, such as mattress, and sofa, etc. that need extremely high carbonizability rendered highly flame resistant by flame resistant agents and advanced flame resistance. The present invention also aims at obtaining upholstered furniture products using the flame resistant fiber composite having advanced flame resistance.

Abstract: The present invention provides a flame retardant synthetic fiber, which is flame retardant by enhancing carbonization and shape retention in combustion by the use of an additive while retaining self-distinguishing property and which is favorably used for bedclothes and furniture necessary to have high flame retardancy, a flame retardant fiber composite containing the flame retardant synthetic fiber, and an upholstered furniture product using the flame retardant fiber composite. A flame retardant synthetic fiber obtained by spinning a composition containing 4 to 50 parts by weight of a glass component having a glass transition temperature of at most 400° C. based on 100 parts by weight of a polymer containing 17 to 70% by weight of a halogen atom.

Abstract: An acrylic shrinkable fiber that can be dyed at a low temperature, and has a high shrinkage percentage even after drying is provided. A dyeable acrylic shrinkable fiber comprising 50 to 99 parts by weight of a polymer (A) comprising 80 to 97 wt % of acrylonitrile, 0 to 2 wt % of a sulfonic acid group-containing monomer and 3 to 20 wt % of a monomer copolymerizable with the monomers; and 1 to 50 parts by weight of a polymer (B) comprising 0 to 89 wt % of acrylonitrile, 1 to 40 wt % of a sulfonic acid group-containing monomer and 10 to 99 wt % of a monomer copolymerizable with the monomers, wherein the polymers (A) and (B) are 100 parts by weight in total is provided.