Denka Company Limited

Atsushi Horihata

Atsushi Takei

Masashi Kume

Yudai Ogawa

Tomohiro Kimura

Kouta Nagaoka

Masamichi Kanaoka

Takashi Muraoka

Shigeharu Yoshii

Rentaroh Suzuki

Yuhei Kasahara

Koji Miyata

Megumi Tsukahara

Kazuhito Sonoda

Masamich Kanaoka

A fiber for artificial hair, the fiber containing 50 parts by mass or more and 95 parts by mass or less of a vinyl chloride-based resin and 5 parts by mass or more and 50 parts by mass or less of a vinyl-based copolymer resin, in which the vinyl-based copolymer resin contains 60% by mass or more and less than 70% by mass of a styrene-based monomer unit and more than 30% by mass and 40% by mass or less of an acrylonitrile-based monomer unit on the basis of the entire vinyl-based copolymer resin.

Fiber for artificial hair and hair accessory product

A fiber for artificial hair is constituted of a resin composition containing an aliphatic polyamide and inorganic particles, and in a particle size distribution of the inorganic particles measured by a laser diffraction method, a ratio (D/D) of D, which is a particle size equivalent to a cumulative percentage of 50% based on volume, to D, which is a particle size equivalent to a cumulative percentage of 10% based on volume, is 1.8 or more and 3.0 or less.

Fiber for artificial hair, head accessory product, and resin composition for artificial hair

A fiber for artificial hair formed of a polyvinyl chloride-based resin composition. The fiber for artificial hair has a value X1 of a loss tangent tans at 70° C. of 0.06 or more and 0.12 or less, when dynamic viscoelasticity is measured under the following conditions, and has a peak in a temperature range of 90° C. or higher and 110° C. or lower. (Dynamic viscoelasticity measurement conditions) The measurement is performed by sandwiching a bundle of 40 fibers for artificial hair that are arranged at a heating rate of 4° C./min and a frequency of 1 Hz.

Fiber for artificial hair and head accessory product

A fiber for artificial hair constituted of a resin composition containing an aliphatic polyamide. A weight average molecular weight Mw of a dissolved component obtained when the fiber for artificial hair is dissolved in hexafluoroisopropanol is 46,000 or more and less than 65,000.

The present invention provides a fiber for artificial hair and a hair decorating product having superior combing property. A fiber for artificial hair includes vinyl chloride based resin, vinyl based copolymer, and vinyl chloride based acrylic graft copolymer.

Fiber for artificial hair and hair decorating product

A resin composition for flame retardant artificial hair which has favorable transparency and combability similar to those of human hair and exhibits excellent flame retardancy. A resin composition for flame retardant artificial hair is obtained by configuring a resin composition including 100 parts by mass of a polyester (A) and 5-40 parts by mass of a bromine-containing flame retardant (B) including at least one kind selected from poly(pentabromobenzyl acrylate), a brominated phenol resin, and polydibromophenylene oxide, wherein the melt viscosity of the polyester (A) is 80-300 Pa&#xb7;s.

Resin composition for artificial hair and molded body of same

The present invention is to provide a fiber for artificial hair which can freely change the hairstyle at home while maintaining the wave shape of the fiber. A fiber for artificial hair having a bending rigidity maintaining ratio defined by formula (1) is 40 to 80% and a heat shrinkage ratio defined by formula (2) is 0.0 to 5.0% is provided.bending rigidity maintaining ratio (%)=100&#xd7;{(bending rigidity in a state after conditioning for 24 hours at 30&#xb0; C.&#xd7;90% RH)/(bending rigidity in a state after conditioning for 24 hours at 23&#xb0; C.&#xd7;50% RH)}&#x2003;&#x2003;(1)heat shrinkage ratio (%)=100&#xd7;{(length before heat treatment)&#x2212;(length after heat treatment for 5 min at 155&#xb0; C.)}/(length before heat treatment)&#x2003;&#x2003;(2).

Fibers for artificial hair

Provided is an artificial hair fiber which can prevent detachment between core and sheath, having superior texture close to human hair, and having superior curl retention. An artificial hair fiber has a core-sheath structure, including: a core; and a sheath covering the core; and: the core includes a core resin composition including polyester; the sheath includes a sheath resin composition including polyamide; the core and the sheath have a core/sheath mass ratio of 40/60 to 90/10; and when a melt viscosity of the polyester of the core is expressed as a, and a melt viscosity of the polyamide of the sheath is expressed as b, a viscosity ratio a/b is 0.5 to 2.5.

Fiber for artificial hair

Polyamide-based fiber for artificial hair that is excellent in drip resistance, texture, and productivity is provided. According to the present invention, provided is fiber for artificial hair, including a resin composition containing: aliphatic polyamide; semi-aromatic polyamide with a skeleton obtained by polycondensation of aliphatic diamine and aromatic dicarboxylic acid; and a bromine-based flame retardant.

Polyamide-based fiber for artificial hair having exceptional dripping resistance upon combustion

Artificial hair fiber having shape memory and shape restoration function, artificial hair fiber having excellent flame resistance, and artificial hair fiber having low gloss appearance are provided. Provided is an artificial hair fiber including a resin composition including at least one polyamide, the artificial hair fiber satisfying at least one of constitutions (1) to (3): (1) the fiber has a modulus of elasticity of 2400 to 3000 N/mm; (2) the polyamide has a weight average molecular weight Mw of 6.5&#xd7;10to 15&#xd7;10and the fiber has a modulus of elasticity of 500 to 15000 N/mm; (3) the fiber has a modulus of elasticity of 500 to 15000 N/mmand the resin composition contains 5 to 20 parts by mass of fine particles with respect to 100 parts by mass of the polyamide.

Artificial hair fiber having shape memory and shape restoration function, artificial hair fiber having excellent flame resistance, and artificial hair fiber having low gloss appearance

Growing community of inventors

Kamakura, Japan

Atsushi Horihata