Makeup brush bristle material and makeup brush using said bristle material

Abstract

An object of the present invention is to provide a makeup brush bristle material and a makeup brush bristle material assembly, both made of synthetic resin, as well as a makeup brush using such bristle material or bristle material assembly, all suitable for applying both powder cosmetics and liquid cosmetics, or more specifically, offering good uptake and release properties with respect to powder or liquid cosmetics. As a solution, a makeup brush bristle material is provided that comprises S-twisted or Z-twisted core-sheath complex monofilaments whose core part is constituted by synthetic resin A and sheath part is constituted by synthetic resin B that differs in type from synthetic resin A, characterized in that the cross-section of the core-sheath complex monofilaments in the direction orthogonal to the axis of fiber has a cocoon shape.

1 . A makeup brush bristle material comprising S-twisted or Z-twisted core-sheath complex monofilaments whose core part is constituted by synthetic resin A and sheath part is constituted by synthetic resin B that differs in type from synthetic resin A, characterized in that a cross-section of the core-sheath complex monofilaments in a direction orthogonal to an axis of fiber has a cocoon shape. 
     
     
         2 . The makeup brush bristle material according to  claim 1 , characterized in that the core-sheath complex monofilament has a narrow tip part having a tapered shape. 
     
     
         3 . The makeup brush bristle material according to  claim 2 , characterized in that the narrow tip part having a tapered shape is branched. 
     
     
         4 . The makeup brush bristle material according to  claim 1 , characterized in that the synthetic resin A and the synthetic resin B are each a polyester-based resin. 
     
     
         5 . The makeup brush bristle material according to  claim 4 , characterized in that the synthetic resin A and the synthetic resin B are each one type selected from polytrimethylene terephthalate, polyethylene terephthalate, and polybutylene terephthalate. 
     
     
         6 . A makeup brush bristle material assembly comprising a mixed assembly of S-twisted and Z-twisted core-sheath complex monofilaments whose core part is constituted by synthetic resin A and sheath part is constituted by synthetic resin B that differs in type from synthetic resin A, characterized in that cross-sections of the core-sheath complex monofilaments in a direction orthogonal to an axis of fiber each have a similar cocoon shape. 
     
     
         7 . A makeup brush characterized by using, at least partially, the makeup brush bristle material according to  claim 1 . 
     
     
         8 . The makeup brush bristle material according to  claim 2 , characterized in that the synthetic resin A and the synthetic resin B are each a polyester-based resin. 
     
     
         9 . The makeup brush bristle material according to  claim 3 , characterized in that the synthetic resin A and the synthetic resin B are each a polyester-based resin. 
     
     
         10 . A makeup brush characterized by using, at least partially, the makeup brush bristle material according to  claim 2 . 
     
     
         11 . A makeup brush characterized by using, at least partially, the makeup brush bristle material according to  claim 3 . 
     
     
         12 . A makeup brush characterized by using, at least partially, the makeup brush bristle material according to  claim 4 . 
     
     
         13 . A makeup brush characterized by using, at least partially, the makeup brush bristle material according to  claim 5 . 
     
     
         14 . A makeup brush characterized by using, at least partially, the makeup brush bristle material according to  claim 6 . 
     
     
         15 . The makeup brush bristle material according to  claim 8 , characterized in that the synthetic resin A and the synthetic resin B are each one type selected from polytrimethylene terephthalate, polyethylene terephthalate, and polybutylene terephthalate. 
     
     
         16 . The makeup brush bristle material according to  claim 9 , characterized in that the synthetic resin A and the synthetic resin B are each one type selected from polytrimethylene terephthalate, polyethylene terephthalate, and polybutylene terephthalate. 
     
     
         17 . A makeup brush characterized by using, at least partially, the makeup brush bristle material according to  claim 8 . 
     
     
         18 . A makeup brush characterized by using, at least partially, the makeup brush bristle material according to  claim 9 . 
     
     
         19 . A makeup brush characterized by using, at least partially, the makeup brush bristle material according to  claim 15 . 
     
     
         20 . A makeup brush characterized by using, at least partially, the makeup brush bristle material according to  claim 16 .