Core-sheath composite fiber for artificial hair, hair ornament including same, and method for manufacturing same

Abstract

A core-sheath conjugate fiber for artificial hair including a core part and a sheath part is provided. The core part includes of a polyester-based resin composition that contains a polyester-based resin as a main component and the sheath part includes a polyamide-based resin composition that contains a polyamide-based resin as a main component. The core-sheath conjugate fiber for artificial hair has a core-to-sheath area ratio of core:sheath=2:8 to 8:2 and a flat two-lobed cross sectional shape, and the polyamide-based resin composition has a melt viscosity of 140 Pa·s or less and contains a pigment. With this configuration, a core-sheath conjugate fiber for artificial hair in which exposure of the core part is suppressed and that has a touch close to that of human hair and an improved combing property, a hair ornament product including the same, and a method for producing the same are provided.

What is claimed is: 
     
         1 . A core-sheath conjugate fiber for artificial hair comprising:
 a core part; and   a sheath part,   wherein:   the core part is comprised of a polyester-based resin composition that comprises a polyester-based resin as a main component and the sheath part is comprised of a polyamide-based resin composition that comprises a polyamide-based resin as a main component, the core-sheath conjugate fiber for artificial hair has a core-to-sheath area ratio of core:sheath=2:8 to 8:2 and a flat two-lobed cross sectional shape, and the polyamide-based resin composition has a melt viscosity of 140 Pa·s or less and comprises a pigment.   
     
     
         2 . The core-sheath conjugate fiber for artificial hair according to  claim 1 , wherein the polyester-based resin composition comprises, as the main component, 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 composition comprises, as the main component, a polyamide-based resin mainly containing 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 melt viscosity of the polyamide-based resin composition is 60 Pa·s or more and 120 Pa·s or less. 
     
     
         5 . The core-sheath conjugate fiber for artificial hair according to  claim 1 , wherein the pigment is at least one selected from the group consisting of a black pigment masterbatch, a red pigment masterbatch, and a yellow pigment masterbatch. 
     
     
         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 polyester-based resin composition comprises, as the main component, 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 composition comprises, as the main component, a polyamide-based resin mainly containing 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 melt viscosity of the polyamide-based resin composition is 60 Pa·s or more and 120 Pa·s or less. 
     
     
         11 . The hair ornament product according to  claim 6 , wherein the pigment is at least one selected from the group consisting of a black pigment masterbatch, a red pigment masterbatch, and a yellow pigment masterbatch. 
     
     
         12 . The hair ornament product according to  claim 6 , wherein the polyamide-based resin composition comprises the pigment in an amount of 0.005 parts by weight or more and 2 parts by weight or less with respect to 100 parts by weight of the polyamide-based resin. 
     
     
         13 . A method for producing the core-sheath conjugate fiber for artificial hair according to  claim 1 , comprising a step of melt spinning the polyester-based resin composition and the polyamide-based resin composition with a core-sheath conjugate nozzle, wherein the polyamide-based resin composition has a melt viscosity of 140 Pa·s or less at a set temperature of the core-sheath conjugate nozzle. 
     
     
         14 . The method for producing the core-sheath conjugate fiber for artificial hair according to  claim 13 , wherein the polyester-based resin composition comprises, as the main component, one or more of polyester-based resins selected from the group consisting of polyalkylene terephthalate and a copolymerized polyester mainly containing polyalkylene terephthalate. 
     
     
         15 . The method for producing the core-sheath conjugate fiber for artificial hair according to  claim 13 , wherein the polyamide-based resin composition comprises, as the main component, a polyamide-based resin mainly containing at least one selected from the group consisting of Nylon 6 and Nylon 66. 
     
     
         16 . The method for producing the core-sheath conjugate fiber for artificial hair according to  claim 13 , wherein the melt viscosity of the polyamide-based resin composition is 60 Pa·s or more and 120 Pa·s or less. 
     
     
         17 . The method for producing the core-sheath conjugate fiber for artificial hair according to  claim 13 , wherein the pigment is at least one selected from the group consisting of a black pigment masterbatch, a red pigment masterbatch, and a yellow pigment masterbatch. 
     
     
         18 . The method for producing the core-sheath conjugate fiber for artificial hair according to  claim 13 , wherein the polyamide-based resin composition comprises the pigment in an amount of 0.005 parts by weight or more and 2 parts by weight or less with respect to 100 parts by weight of the polyamide-based resin. 
     
     
         19 . The core-sheath conjugate fiber for artificial hair according to  claim 1 , wherein the polyamide-based resin composition comprises the pigment in an amount of 0.005 parts by weight or more and 2 parts by weight or less with respect to 100 parts by weight of the polyamide-based resin.