Fiber for artificial hair

Patent metadata

Field	Value
Publication number	US-10856598-B2
Application number	US-201716085898-A
Country	US
Kind code	B2
Filing date	Mar 21, 2017
Priority date	Apr 28, 2016
Publication date	Dec 8, 2020
Grant date	Dec 8, 2020

Abstract

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.

First claim

The invention claimed is:

1. An artificial hair fiber having a core-sheath structure, comprising:
a core; and
a sheath covering the core; wherein:
the core comprises a core resin composition including polyester;
the sheath comprises a sheath resin composition including polyamide;
the core and the sheath have a core/sheath mass ratio of 70/30 to 90/10;
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; and
the polyester of the core resin composition comprises polyethylene terephthalate and polybutylene terephthalate, and a mass ratio of the polyethylene terephthalate and the polybutylene terephthalate is 40/60 to 90/10.

2. The artificial hair fiber of claim 1 , wherein the core resin composition comprises at least one bromine-based flame retardant selected from the group consisting of brominated benzyl acrylate, brominated phenol, polydibromophenylene oxide, brominated polystyrene, ethylene bistetrabromophthalimide, bis(pentabromophenyl)ethane, brominated epoxy, brominated phenoxy, brominated polycarbonate and bromine containing triazine compound.

3. The artificial hair fiber of claim 2 , wherein the bromine-based flame retardant is added to the core resin composition by 3 to 30 parts by mass with respect to 100 parts by mass of the polyester.

4. The artificial hair fiber of claim 1 , wherein the sheath resin composition comprises at least one bromine-based flame retardant selected from the group consisting of brominated benzyl acrylate, brominated phenol, polydibromophenylene oxide, brominated polystyrene, ethylene bistetrabromophthalimide, bis(pentabromophenyl)ethane, brominated epoxy, brominated phenoxy, brominated polycarbonate and bromine containing triazine compound.

5. The artificial hair fiber of claim 4 , wherein the bromine-based flame retardant is added to the sheath resin composition by 3 to 30 parts by mass with respect to 100 parts by mass of the polyamide.

6. The artificial hair fiber of claim 1 , wherein the core resin composition further comprises a compatibilizer by 0.5 to 3 parts by mass with respect to 100 parts by mass of the polyester.

7. The artificial hair fiber of claim 1 , wherein the sheath resin composition further comprises a compatibilizer by 0.5 to 3 parts by mass with respect to 100 parts by mass of the polyamide.

8. An artificial hair fiber having a core-sheath structure, comprising:
a core; and
a sheath covering the core; wherein:
the core comprises a core resin composition including polyester;
the sheath comprises a sheath resin composition including polyamide;
the core and the sheath have a core/sheath mass ratio of 70/30 to 90/10;
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; and wherein the polyester of the core resin composition comprises polyethylene terephthalate and polytrimethylene terephthalate, and a mass ratio of the polyethylene terephthalate and the polytrimethylene terephthalate is 40/60 to 90/10.

9. The artificial hair fiber of claim 8 , wherein the core resin composition comprises at least one bromine-based flame retardant selected from the group consisting of brominated benzyl acrylate, brominated phenol, polydibromophenylene oxide, brominated polystyrene, ethylene bistetrabromophthalimide, bis(pentabromophenyl)ethane, brominated epoxy, brominated phenoxy, brominated polycarbonate and bromine containing triazine compound.

10. The artificial hair fiber of claim 9 , wherein the bromine-based flame retardant is added to the core resin composition by 3 to 30 parts by mass with respect to 100 parts by mass of the polyester.

11. The artificial hair fiber of claim 8 , wherein the sheath resin composition comprises at least one bromine-based flame retardant selected from the group consisting of brominated benzyl acrylate, brominated phenol, polydibromophenylene oxide, brominated polystyrene, ethylene bistetrabromophthalimide, bis(pentabromophenyl)ethane, brominated epoxy, brominated phenoxy, brominated polycarbonate and bromine containing triazine compound.

12. The artificial hair fiber of claim 11 , wherein the bromine-based flame retardant is added to the sheath resin composition by 3 to 30 parts by mass with respect to 100 parts by mass of the polyamide.

13. The artificial hair fiber of claim 8 , wherein the core resin composition further comprises a compatibilizer by 0.5 to 3 parts by mass with respect to 100 parts by mass of the polyester.

14. The artificial hair fiber of claim 8 , wherein the sheath resin composition further comprises a compatibilizer by 0.5 to 3 parts by mass with respect to 100 parts by mass of the polyamide.

15. An artificial hair fiber having a core-sheath structure, comprising:
a core; and
a sheath covering the core; wherein:
the core comprises a core resin composition including polyester;
the sheath comprises a sheath resin composition including polyamide;
the core and the sheath have a core/sheath mass ratio of 70/30 to 90/10;
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; and the polyamide of the sheath resin composition comprises nylon 6,6 and nylon 6, and a mass ratio of the nylon 6,6 and the nylon 6 is 70/30 to 95/5.

16. The artificial hair fiber of claim 15 , wherein the core resin composition comprises at least one bromine-based flame retardant selected from the group consisting of brominated benzyl acrylate, brominated phenol, polydibromophenylene oxide, brominated polystyrene, ethylene bistetrabromophthalimide, bis(pentabromophenyl)ethane, brominated epoxy, brominated phenoxy, brominated polycarbonate and bromine containing triazine compound.

17. The artificial hair fiber of claim 16 , wherein the bromine-based flame retardant is added to the core resin composition by 3 to 30 parts by mass with respect to 100 parts by mass of the polyester.

18. The artificial hair fiber of claim 15 , wherein the sheath resin composition comprises at least one bromine-based flame retardant selected from the group consisting of brominated benzyl acrylate, brominated phenol, polydibromophenylene oxide, brominated polystyrene, ethylene bistetrabromophthalimide, bis(pentabromophenyl)ethane, brominated epoxy, brominated phenoxy, brominated polycarbonate and bromine containing triazine compound.

19. The artificial hair fiber of claim 18 , wherein the bromine-based flame retardant is added to the sheath resin composition by 3 to 30 parts by mass with respect to 100 parts by mass of the polyamide.

20. The artificial hair fiber of claim 15 , wherein the core resin composition further comprises a compatibilizer by 0.5 to 3 parts by mass with respect to 100 parts by mass of the polyester.

21. The artificial hair fiber of claim 15 , wherein the sheath resin composition further comprises a compatibilizer by 0.5 to 3 parts by mass with respect to 100 parts by mass of the polyamide.

Assignees

• Denka Company Ltd

Inventors

• Miyata Koji
• Horihata Atsushi
• Sonoda Kazuhito
• Takei Atsushi

Classifications

• D01F8/14

  with at least one polyester as constituent · CPC title

• D01F8/12

  with at least one polyamide as constituent · CPC title

• D01F1/07 Primary

  for making fire- or flame-proof filaments · CPC title

• A41G3/0083 Primary

  Wigs characterised by their hair filaments · CPC title

• A41G3/00 Primary

  Wigs (for dolls only A63H3/44) · CPC title