Fibers for artificial hair
AssigneeDenka Company Limited
InventorsAtsushi Horihata, Atsushi Takei, Rentaroh Suzuki
Life of this patent
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Abstract
The present invention is to provide a fiber for artificial hair which can freely change the hairstyle at home while maintaining the wave shape of the fiber. A fiber for artificial hair having a bending rigidity maintaining ratio defined by formula (1) is 40 to 80% and a heat shrinkage ratio defined by formula (2) is 0.0 to 5.0% is provided. bending rigidity maintaining ratio (%)=100×{(bending rigidity in a state after conditioning for 24 hours at 30° C.×90% RH)/(bending rigidity in a state after conditioning for 24 hours at 23° C.×50% RH)} (1) heat shrinkage ratio (%)=100×{(length before heat treatment)−(length after heat treatment for 5 min at 155° C.)}/(length before heat treatment) (2).
Claims11
A fiber for artificial hair having a bending rigidity maintaining ratio defined by formula (1) is 40 to 80% and a heat shrinkage ratio defined by formula (2) is 0.0 to 5.0%,
- bending rigidity maintaining ratio (%)=100×{(bending rigidity in a state after conditioning for 24 hours at 30° C.×90% RH)/(bending rigidity in a state after conditioning for 24 hours at 23° C.×50% RH)} (1)
- heat shrinkage ratio (%)=100×{(length before heat treatment)−(length after heat treatment for 5 min at 155° C.)}/(length before heat treatment) (2)
- wherein a waveform shape of the fiber is within a range defined by formula (3),
- 15 mm<L≤50 mm (3), and
- the wave shape of the fiber is within a range defined by formula (4),
- 3 mm<R≤10 mm (4),
- wherein L is length of one cycle of wave in the length direction of the fiber and R is width of in the width direction of the fiber.
Dependencies are inferred from the claim text.