Kanegafuchi Kagaku Kogyo Kabushiki Kaisha

Kaneka Corporation

Hiroyuki Nakashima

Kenichiro Cho

Nobuyuki Nishi

Naohiko Kakita

Koichi Nishiura

Masaharu Fujii

Atuyoshi Tamura

Yoichi Kanbara

The present invention relates to a process for preparing synthetic hair fiber comprising halogen-containing synthetic fiber, in which synthetic hair fiber can be evenly dyed at a low temperature in a short period, maintaining excellent fastness, without abnormal shrinking (frizzing) and embrittlement of the fiber due to swelling. The object is attained by dipping the synthetic hair fiber bundle in a solution containing a dye, a carrier (accelerating agent) and a solvent for halogen-containing fiber, and then dyeing at 60&#xb0; to 90&#xb0; C.

Process for dyeing synthetic hair

Modified cross-section fibers for artificial hair having an improved bulkiness and a soft feeling as compared with conventional fibers for the artificial hair, comprising synthetic fibers, the synthetic fiber having a cross-section comprising one central connecting portion and projections extended in three directions from the central connecting portions, wherein at least one of the three projections is most narrowed at a portion where it is nearer from a top edge of the projection than 1/2 of a length R from a center of the central connecting portion to the top edge of the projection, a ratio of W1/W2 wherein W1 is a width of the widest portion in a portion where it is nearer from the top edge than the most narrowed portion, and W2 is a width of the most narrowed portion is 1.05 to 2.0, and a ratio of R/W1 wherein R and W1 are the same as defined above is from 1.10 to 5.0.

Modified cross-section fiber for artificial hair

Fiber for artificial hair having an excellent bulkiness and also a soft feeling like the human hair, as compared with conventional fibers, are provided. The fiber comprise synthetic fibers, wherein an apparent bulk specific gravity of the fiber before crimping is within a range of from 0.1 to 0.2, an apparent bulk specific gravity of the fiber after crimping is within a range of from 0.02 to 0.05, a cross-section of the fiber is a modified cross-sectional shape comprising one central connecting portion, and projections extended in at least three directions from the central connecting portion, part of a surface or the entire surface of the fiber is open in the longitudinal direction of the fiber, and the fiber has a single yarn fineness of from 25 to 75 denier.

Fiber for artificial hair having excellent bulkiness

A filament for brushmaking which is excellent in yield and in bend recovery, and when used in making paintbrushes, can give brushes with good paintability. A filament has a specified cross section having a plurality of cavity of hollow structures, the hollow ratio being 20 to 60% based on the whole cross-sectional area, capable of affording greater yield, ready processability at its end, excellent stiffness and excellent cleanability.

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Kakogawa, Japan

Hiroyuki Nakashima