Brush bristle material
OwnerKenji Nakamura, Koji Nakamurainventors
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Abstract
A polytrimethylene terephthalate (PTT) brush bristle material has irregularities of 1 to 12 μm formed in its tapered section and offers flexibility and high powder-cosmetic trapping property equivalent to those of natural animal hairs.
Claims13
A brush bristle material comprising a monofilament comprised of polytrimethylene terephthalate (PTT), said monofilament having a tip section with irregularities of about 1 μm to about 20 μm formed on a surface of the tip section, wherein concave parts of the irregularities are configured at intervals of about 5 μm to about 50 μm to trap powder cosmetic material therein, and the tip section is tapered in a tip direction wherein the irregularities are larger in an area close to a distal end of the tapered section than in an area close to a proximal end of the tapered section.
A brush bristle material comprising a monofilament comprised of polytrimethylene terephthalate (PTT), said monofilament having a tip section with irregularities of about 1 μm to about 20 μm formed on a surface of the tip section, wherein the tip section is tapered in a tip direction, and the tapered section of the monofilament has a length of about 10 mm to about 20 mm and has crimp shapes formed with a crimp length of about 40 times to about 50 times the thickness of the monofilament and a crimp height of 3 to 6 times the thickness of the monofilament.
Dependencies are inferred from the claim text.