Fiber for artificial hair and head accessory product
AssigneeDenka Company Limited
InventorsAtsushi Horihata, Atsushi Takei
Life of this patent
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Abstract
A fiber for artificial hair formed of a polyvinyl chloride-based resin composition. The fiber for artificial hair has a value X1 of a loss tangent tans at 70° C. of 0.06 or more and 0.12 or less, when dynamic viscoelasticity is measured under the following conditions, and has a peak in a temperature range of 90° C. or higher and 110° C. or lower. (Dynamic viscoelasticity measurement conditions) The measurement is performed by sandwiching a bundle of 40 fibers for artificial hair that are arranged at a heating rate of 4° C./min and a frequency of 1 Hz.
Claims6
A fiber bundle for artificial hair formed of a polyvinyl chloride-based resin composition,
- wherein the polyvinyl chloride-based resin composition includes a non-crosslinked polyvinyl chloride-based resin and a crosslinked polyvinyl chloride-based resin,
- a content of the crosslinked polyvinyl chloride-based resin with respect to 100 parts by mass of the non-crosslinked polyvinyl chloride-based resin is 4 parts by mass or more and 10 parts by mass or less,
- in the crosslinked polyvinyl chloride-based resin, a viscosity average degree of polymerization of a component dissolved in tetrahydrofuran is 1,600 or more and 2,300 or less,
- a cross section of the fiber for artificial hair has a shape of a polygon, and
- when dynamic viscoelasticity is measured under the following conditions (i), the fiber for artificial hair has a value X1 of a loss tangent tan δ at 70° C. of 0.06 or more and 0.12 or less, and has a peak in a temperature range of 90° C. or higher and 110° C. or lower,
- (dynamic viscoelasticity measurement conditions (i))
- the measurement is performed by sandwiching a bundle of 40 fibers for artificial hair that are arranged at a heating rate of 4° C./min and a frequency of 1 Hz.
Dependencies are inferred from the claim text.