# US 9,006,323 B2 · Dispersion containing flame-resistant polymer, flame-resistant fiber, and carbon fiber

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- Number: US 9,006,323 B2
- Document ID: US9006323B2
- Status: Granted
- Kind: B2
- Application number: 12/745,566
- Filed: 2007-12-19
- Published: 2010-11-04
- Granted: 2015-04-14
- Earliest claimed: 2007-12-19
- Assignees: Toray Industries, Inc.
- Applicants: Masafumi Sudo; Daisuke Kawakami; Tomihiro Ishida
- Inventors: Masafumi Sudo; Daisuke Kawakami; Tomihiro Ishida
- Web page: https://patentgrep.com/patent/US9006323B2

## CPC

- C09D 133/18: Homopolymers or copolymers of nitriles
- C08K 5/0066: {Flame-proofing or flame-retarding additives}
- C08K 5/0091: {Complexes with metal-heteroatom-bonds}
- C08K 5/092: Polycarboxylic acids
- C08K 5/095: Carboxylic acids containing halogens
- C08K 5/098: Metal salts of carboxylic acids
- D01F 6/18: from polymers of unsaturated nitriles, e.g. polyacrylonitrile, polyvinylidene cyanide
- D01F 9/22: from polyacrylonitriles
- C08L 2201/02: Flame or fire retardant/resistant
- C08L 2203/12: used for fibers
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- 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)

## Abstract

A dispersion contains a flame-resistant polymer, which can improve shaping stability of the flame-resistant polymer during ejection from a die orifice, and physical stability of a shaped product in a washing step. The dispersion containing a flame-resistant polymer is a dispersion in which a flame-resistant polymer is dispersed in an organic solvent, an in-water tensile strength thereof per unit cross-sectional area is 1.0 MPa or more and 6.5 MPa or less, the flame-resistant polymer can be preferably obtained by heat-treating an acrylonitrile polymer in the presence of at least one kind of acid, acid anhydride or acid chloride in an organic solvent, and a suitable organic solvent is a polar organic solvent.

## Claims

### Claim 1

A dispersion comprising 1) a flame-resistant polymer obtained by heat-treating an acrylonitrile polymer as a precursor polymer dispersed in 2) a polar organic solvent in the presence of at least an acid, an acid anhydride or an acid chloride and 3) an oxidizing agent,
wherein an in-water tensile strength per unit cross-sectional area of the flame-resistant polymer is 1.0 MPa or more and 6.5 MPa or less,
a total additional amount of the acid is 0.05 part by weight to 5.0 parts by weight based on 10.0 parts by weight of the acrylonitrile polymer, and
wherein the acid is a monocarboxylic acid selected from the group consisting of benzoic acid, hydroxybenzoic acid, methylbenzoic acid and aminobenzoic acid,
a dicarboxylic acid selected from the group consisting of phthalic acid, isophthalic acid and terephthalic acid, or an aminosulfonic acid which is taurine or sulfanilic acid.

### Claim 2 (depends on 1)

A flame-resistant fiber comprising a shaped dispersion, wherein the dispersion is the dispersion containing a flame-resistant polymer of claim 1.

### Claim 3 (depends on 2)

A carbon fiber comprising a carbonized flame-resistant fiber, wherein the flame-resistant fiber is the flame-resistant fiber of claim 2.

### Claim 4 (depends on 1)

The dispersion according to claim 1, further comprising a cyclizing agent.