Core-sheath composite fiber for artificial hair, headwear product including same, and production method for same

Abstract

A core-sheath conjugate fiber for artificial hair includes a core part and a sheath part. The core-sheath conjugate fiber for artificial hair has a flat two-lobed cross sectional shape or an elliptical cross sectional shape, and has a core-to-sheath area ratio of core:sheath=3:7 to 8:2 in a fiber cross section. The sheath part contains a polyamide-based resin composition containing a polyamide-based resin. The core part has a modified flat two-lobed cross sectional shape or a modified elliptical cross sectional shape including a pair of protrusions protruding from the center side toward the outer circumferential side along a minor axis direction of the fiber cross section. A core-sheath conjugate fiber for artificial hair having a touch close to that of human hair, an excellent combing property, and a good curl setting property, a hair ornament product including the same, and a method for producing the same are provided.

1 . A core-sheath conjugate fiber for artificial hair comprising:
 a core part; and   a sheath part,   wherein:   the core-sheath conjugate fiber for artificial hair has a flat two-lobed cross sectional shape and a core-to-sheath area ratio of core:sheath=3:7 to 8:2 in a fiber cross section,   the sheath part is comprised of a polyamide-based resin composition that comprises a polyamide-based resin, and   the core part has a modified elliptical cross sectional shape including a pair of protrusions protruding from a center side toward an outer circumferential side along a minor axis direction of the fiber cross section.   
     
     
         2 . The core-sheath conjugate fiber for artificial hair according to  claim 1 , wherein the core part is comprised of a polyester-based resin composition that comprises one or more of polyester-based resins selected from the group consisting of polyalkylene terephthalate and a copolymerized polyester mainly containing polyalkylene terephthalate. 
     
     
         3 . The core-sheath conjugate fiber for artificial hair according to  claim 1 , wherein the polyamide-based resin mainly contains at least one selected from the group consisting of Nylon 6 and Nylon 66. 
     
     
         4 . The core-sheath conjugate fiber for artificial hair according to  claim 1 , wherein the core-sheath conjugate fiber is a concentric core-sheath conjugate fiber. 
     
     
         5 . A method for producing the core-sheath conjugate fiber for artificial hair according to  claim 1 , comprising a step of melt spinning a core part resin composition and a sheath part resin composition with a core-sheath conjugate nozzle. 
     
     
         6 . A hair ornament product comprising the core-sheath conjugate fiber for artificial hair according to  claim 1 . 
     
     
         7 . The hair ornament product according to  claim 6 , 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. 
     
     
         8 . The hair ornament product according to  claim 6 , wherein the core part is comprised of a polyester-based resin composition that comprises one or more of polyester-based resins selected from the group consisting of polyalkylene terephthalate and a copolymerized polyester mainly containing polyalkylene terephthalate. 
     
     
         9 . The hair ornament product according to  claim 6 , wherein the polyamide-based resin mainly contains at least one selected from the group consisting of Nylon 6 and Nylon 66. 
     
     
         10 . The hair ornament product according to  claim 6 , wherein the core-sheath conjugate fiber is a concentric core-sheath conjugate fiber.