Core-sheath composite fiber for artificial hair and headdress product comprising same

Abstract

A conjugate fiber including a core part and a sheath part covering the core part such that the conjugate fiber has a core-to-sheath area ratio of core:sheath=2:8 to 7:3 and an eccentricity of 5% or more in a cross section thereof. The cross section is in a multilobed shape and has a major axis of length L and a first minor axis of length Si y satisfying a ratio of L/S1 being 1.10-3.00. The core part has a major axis of length Lc and a first minor axis of length Sc satisfying a ratio of Lc/Sc being 1.10-3.00. The major axis of the core part is in a direction that substantially coincides with a direction of the major axis of the cross section.

What is claimed is: 
     
         1 . A conjugate fiber, comprising:
 a core part; and   a sheath part covering the core part such that the conjugate fiber has a core-to-sheath area ratio of core:sheath=2:8 to 7:3 and an eccentricity of 5% or more in a cross section thereof,   wherein the cross section is in a multilobed shape and has a major axis of length L and a first minor axis of length S1 satisfying a ratio of L/S1 being 1.10-3.00, where the major axis of the cross section is a longest straight line among a symmetrical axis of the cross section and straight lines that connect any two points on an outer circumference of the cross section and that extend parallel to the symmetrical axis of the cross section, and the first minor axis of the cross section is a longest straight line formed when any two points on the outer circumference of the cross section are connected perpendicular to the major axis of the cross section, and   the core part has a major axis of length Lc and a first minor axis of length Sc satisfying a ratio of Lc/Sc being 1.10-3.00, where the major axis of the core part is a longest straight line among a symmetrical axis of the core part and straight lines that connect any two points on an outer circumference of the core part and that extend parallel to the symmetrical axis of the core part, the major axis of the core part is in a direction that substantially coincides with a direction of the major axis of the cross section, and the first minor axis of the core part is a longest straight line formed when any two points on the outer circumference of the core part are connected perpendicular to the major axis of the core part.   
     
     
         2 . The conjugate fiber according to  claim 1 , wherein the cross section has a second minor axis of length S2 satisfying a ratio of S2/S1 being 0.50 or more and less than 1.00, where the second minor axis is a shortest straight line formed when any two points on the outer circumference of the cross section are connected perpendicular to the major axis of the cross section. 
     
     
         3 . The conjugate fiber according to  claim 1 , wherein the multilobed shape is a two-lobed shape in which two circles, two ellipses, or one circle and one ellipse are connected via recesses. 
     
     
         4 . The conjugate fiber according to  claim 1 , wherein the conjugate fiber comprises at least one resin composition selected from the group consisting of a polyester-based resin composition, a polyamide-based resin composition, a vinyl chloride-based resin composition, a modacrylic-based resin composition, a polycarbonate-based resin composition, a polyolefin-based resin composition, and a polyphenylene sulfide-based resin composition. 
     
     
         5 . The conjugate fiber according to  claim 1 , wherein at least one of the core part and the sheath part comprises a polyester-based resin composition comprising at least one polyester-based resin selected from the group consisting of polyalkylene terephthalate and a copolymerized polyester comprising polyalkylene terephthalate as a main component. 
     
     
         6 . The conjugate fiber according to  claim 1 , wherein at least one of the core part and the sheath part comprises a polyamide-based resin composition comprising polyamide-based resin comprising at least one selected from the group consisting of nylon 6 and nylon 66 as a main component. 
     
     
         7 . A hair ornament product, comprising:
 the conjugate fiber of  claim 1 .   
     
     
         8 . The hair ornament product according to  claim 7 , wherein the hair ornament product is one selected from the group consisting of a hair wig, a hairpiece, weaving hair, a hair extension, braided hair, a hair accessory, and doll hair. 
     
     
         9 . The conjugate fiber according to  claim 2 , wherein the multilobed shape is a two-lobed shape in which two circles, two ellipses, or one circle and one ellipse are connected via recesses. 
     
     
         10 . The conjugate fiber according to  claim 2 , wherein the conjugate fiber comprises at least one resin composition selected from the group consisting of a polyester-based resin composition, a polyamide-based resin composition, a vinyl chloride-based resin composition, a modacrylic-based resin composition, a polycarbonate-based resin composition, a polyolefin-based resin composition, and a polyphenylene sulfide-based resin composition. 
     
     
         11 . The conjugate fiber according to  claim 3 , wherein the conjugate fiber comprises at least one resin composition selected from the group consisting of a polyester-based resin composition, a polyamide-based resin composition, a vinyl chloride-based resin composition, a modacrylic-based resin composition, a polycarbonate-based resin composition, a polyolefin-based resin composition, and a polyphenylene sulfide-based resin composition. 
     
     
         12 . The conjugate fiber according to  claim 2 , wherein at least one of the core part and the sheath part comprises a polyester-based resin composition comprising at least one polyester-based resin selected from the group consisting of polyalkylene terephthalate and a copolymerized polyester comprising polyalkylene terephthalate as a main component. 
     
     
         13 . The conjugate fiber according to  claim 3 , wherein at least one of the core part and the sheath part comprises a polyester-based resin composition comprising at least one polyester-based resin selected from the group consisting of polyalkylene terephthalate and a copolymerized polyester comprising polyalkylene terephthalate as a main component. 
     
     
         14 . The conjugate fiber according to  claim 4 , wherein at least one of the core part and the sheath part comprises a polyester-based resin composition comprising at least one polyester-based resin selected from the group consisting of polyalkylene terephthalate and a copolymerized polyester comprising polyalkylene terephthalate as a main component. 
     
     
         15 . The conjugate fiber according to  claim 2 , wherein at least one of the core part and the sheath part comprises a polyamide-based resin composition comprising polyamide-based resin comprising at least one selected from the group consisting of nylon 6 and nylon 66 as a main component. 
     
     
         16 . The conjugate fiber according to  claim 3 , wherein at least one of the core part and the sheath part comprises a polyamide-based resin composition comprising polyamide-based resin comprising at least one selected from the group consisting of nylon 6 and nylon 66 as a main component. 
     
     
         17 . The conjugate fiber according to  claim 4 , wherein at least one of the core part and the sheath part comprises a polyamide-based resin composition comprising polyamide-based resin comprising at least one selected from the group consisting of nylon 6 and nylon 66 as a main component. 
     
     
         18 . The conjugate fiber according to  claim 5 , wherein at least one of the core part and the sheath part comprises a polyamide-based resin composition comprising polyamide-based resin comprising at least one selected from the group consisting of nylon 6 and nylon 66 as a main component. 
     
     
         19 . A hair ornament product, comprising:
 the conjugate fiber of  claim 2 .   
     
     
         20 . The hair ornament product according to  claim 19 , wherein the hair ornament product is one selected from the group consisting of a hair wig, a hairpiece, weaving hair, a hair extension, braided hair, a hair accessory, and doll hair.