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    CERIUM OXIDE POWDER AND COSMETIC MATERIAL, COATING MATERIAL AND PLASTIC CONTAINING THE SAME
    23.
    发明专利
    CERIUM OXIDE POWDER AND COSMETIC MATERIAL, COATING MATERIAL AND PLASTIC CONTAINING THE SAME 失效

    公开(公告)号：JPH11228135A

    公开(公告)日：1999-08-24

    申请号：JP3472198

    申请日：1998-02-17

    Applicant: TORAY INDUSTRIES

    Inventor： ONO MAMORU ,  YOSHIDA FUMIO ,  TANAKA KOICHI

    IPC: A61K8/06 ,  C01F17/00 ,  C04B35/50 ,  C08K3/22 ,  C09D7/12 ,  A61K7/00

    Abstract: PROBLEM TO BE SOLVED: To reduce the deterioration or the photoactivity of cosmetic, coating material and plastic caused by ultraviolet ray by specifying the number average particle diameter range of a primary particle and the half-value width range of angle of diffraction in X-ray diffraction to improve ultraviolet shielding property. SOLUTION: In a powder of cerium oxide, the number average particle diameter of the primary particle is controlled to 0.01-0.5 μm. If the particle diameter is below the lower limit, the probability of light transmission is increased to make the shielding property insufficient though the number of the particle is increased and if the particle diameter exceeds the upper limit, the number of the particle is decreased to make the shielding property insufficient though light is not transmitted to be scattered. And the half-value width 2δ (degree) of 28.6 deg. angle of diffraction (111 plane) in the X-ray diffraction is 0.7-0.15. In the range where the half-value width exceeds the upper limit, the crystallinity becomes insufficient to be nearly amorphous and in the range below the lower limit, the particle is over grown and in both case, ultraviolet ray is easily transmitted. The cerium oxide is blended to the coating material or the cosmetic in the form as the particle is and can be also blended in a paste-like or slurry like form.

    BALLPOINT PEN, CERAMIC BALL FOR THE PEN, AND MANUFACTURE OF THE BALL
    24.
    发明专利
    BALLPOINT PEN, CERAMIC BALL FOR THE PEN, AND MANUFACTURE OF THE BALL 失效

    公开(公告)号：JPH10147091A

    公开(公告)日：1998-06-02

    申请号：JP30645196

    申请日：1996-11-18

    Applicant: TORAY INDUSTRIES

    Inventor： OGATA TOMOHIKO ,  KAWAKITA SUSUMU ,  YOSHIDA FUMIO

    IPC: B43K1/08 ,  C04B35/00

    Abstract: PROBLEM TO BE SOLVED: To improve satisfactory processability of giving precise sphericity in addition to wear resistance, corrosion resistance and mechanical strength, surface smoothness in the case of a product and writing characteristics by specifying surface roughness of a ceramic ball for a ballpoint pen. SOLUTION: The ceramic ball for a ballpoint pen is formed on its surface to have a width of 0.5μm or more, a depth of 0.2μm or more, a length of 10μm or more without a polishing damage within a region of 100μm , a centerline mean roughness of 4.5 to 10nm and maximum and minimum roughnesses of 50 to 100nm. On the surface of the ball, in an arbitrary range of 2,500m , polishing damages of a width of 0.5μm or more, a depth of 0.2μm or more and a length of 10μm or more are two or less. As the material of the ceramics adapted to the ball for the pen, suitable hardness and strength are required, and hence any of ceramics of alumina, silicon nitride and composite ceramic sintered material is suitable.

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