Artificial hair fiber

Patent metadata

Field	Value
Publication number	US-11432607-B2
Application number	US-201816614189-A
Country	US
Kind code	B2
Filing date	May 23, 2018
Priority date	May 30, 2017
Publication date	Sep 6, 2022
Grant date	Sep 6, 2022

Abstract

A polyvinyl chloride-based fiber for artificial hair that has excellent low glossiness and grip performance when woven and can be stably spun. Configuring a fiber for artificial hair using a polyvinyl chloride-based resin composition, wherein the polyvinyl chloride-based resin includes, at predetermined blending amounts, a polyvinyl chloride-based resin (A) having a viscosity-average polymerization degree of 450-1,700 and a crosslinked vinyl chloride-based resin (B) in which the viscosity-average polymerization degree of a component that dissolves in tetrahydrofuran is 1,800-2,300, the difference between the viscosity-average polymerization degree of the polyvinyl chloride-based resin (A) and the viscosity-average polymerization degree of the THF-soluble component of the crosslinked vinyl chloride-based resin (B) is in a predetermined range, and the cross-sectional shape of the fiber for artificial hair has a first projection, a second projection, and a third projection and the lengths and widths thereof satisfy predetermined conditions.

First claim

The invention claimed is:

1. A fiber for artificial hair using a polyvinyl chloride-based resin composition, wherein
the polyvinyl chloride-based resin composition comprises 90-99 parts by mass of a polyvinyl chloride-based resin (A) having a viscosity-average polymerization degree of 450-1,450 and 1-10 parts by mass of a crosslinked vinyl chloride-based resin (B) having a viscosity-average polymerization degree for a component that is soluble in tetrahydrofuran of 1,900-2,300,
the difference between the viscosity-average polymerization degree of the polyvinyl chloride-based resin (A) and the viscosity-average polymerization degree for the component that is soluble in tetrahydrofuran of the crosslinked vinyl chloride-based resin (B) is 600-1,850, and,
the cross-sectional shape of the fiber for artificial hair has a first projection, a second projection, and a third projection extending outward from a center C of the cross-sectional shape and when the length of the first projection from the center C is set as L 1 , wherein L 1 is 65-80 μm, the length of the second projection from the center C is set as L 2 , and the length of the third projection from the center C is set as L 3 , the shapes of the projections satisfy (2) and (3) below:
(2) the ratio of a width W 1 (0.15) of the first projection at a distance of 0.15L 1 from the center C and a width W 1(0.9) of the first projection at a distance of 0.9L 1 from the center C (W 1(0.15) /W 1(0.9) ) is 1.5-2.3;
(3) the ratio of a width W 2(0.15) of the second projection at a distance of 0.15L 2 from the center C and a width W 2(0.9) of the second projection at a distance of 0.9L 2 from the center C (W 2(0.15) /W 2(0.9) ) is 2.0-2.2; and the ratio of a width W 3(0.15) of the third projection at a distance of 0.15L 3 from the center C and a width W 3(0.9) of the third projection at a distance of 0.9L 3 from the center C (W 3(0.15) /W 3(0.9) ) is 1.9-2.4,

and wherein the length L 1 of the first projection, length L 2 of the second projection, and the length L 3 of the third projection from the center C satisfy L 3 ≤L 2 , 0.8L 1 ≤L 2 ≤0.95L 1 and 0.8L 1 ≤L 3 ≤0.95L 1 .

2. The fiber for artificial hair according to claim 1 , containing 0.1-5.0 parts by mass of at least one thermal stabilizer selected from the group consisting of tin-based thermal stabilizers, Ca—Zn-based thermal stabilizers, hydrotalcite-based thermal stabilizers, epoxy-based thermal stabilizers, and β-diketone-based thermal stabilizers with respect to a total of 100 parts by mass of the polyvinyl chloride-based resin (A) and the crosslinked vinyl chloride-based resin (B).

3. The fiber for artificial hair according to claim 2 , containing 0.1-5.0 parts by mass of at least one thermal stabilizer selected from the group consisting of tin-based thermal stabilizers, Ca-Zn-based thermal stabilizers, hydrotalcite-based thermal stabilizers, epoxy-based thermal stabilizers, and β-diketone-based thermal stabilizers with respect to a total of 100 parts by mass of the polyvinyl chloride-based resin (A) and the crosslinked vinyl chloride-based resin (B).

4. The fiber for artificial hair according to claim 1 , containing 0.1-5.0 parts by mass of at least one thermal stabilizer selected from the group consisting of tin-based thermal stabilizers, Ca—Zn-based thermal stabilizers, hydrotalcite-based thermal stabilizers, epoxy-based thermal stabilizers, and β-diketone-based thermal stabilizers with respect to a total of 100 parts by mass of the polyvinyl chloride-based resin (A) and the crosslinked vinyl chloride-based resin (B).

Assignees

• Denka Company Ltd

Inventors

• Akahane Takuya
• Kanaoka Masamichi
• Kume Masashi

Classifications

• A61L2430/18

  for hair reconstruction · CPC title

• A61L27/16

  obtained by reactions only involving carbon-to-carbon unsaturated bonds · CPC title

• C08L2205/025

  containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure · CPC title

• A41G3/0083 Primary

  Wigs characterised by their hair filaments · CPC title

• D01F6/48 Primary

  of polymers of halogenated hydrocarbons · CPC title