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    Spherical polymethylsilsesquioxane particles
    1.
    发明授权
    Spherical polymethylsilsesquioxane particles 有权

    公开(公告)号：US12054587B2

    公开(公告)日：2024-08-06

    申请号：US17051696

    申请日：2019-07-01

    申请人： TOKUYAMA CORPORATION

    发明人： Toru Iwata ,  Yohei Chikashige ,  Tadaharu Komatsubara

    IPC分类号： C08G77/04 ,  C08G77/08

    CPC分类号： C08G77/045 ,  C08G77/04 ,  C08G77/08

    摘要： Provided is a novel spherical polymethylsilsesquioxane particle having an unprecedentedly large specific surface area ratio. The spherical polymethylsilsesquioxane particle includes a particle main body containing at least: a network structure formed by silicon atoms (n) and oxygen atoms (n) bonded to the silicon atoms (n); a methyl group bonded to at least one of the silicon atoms (n); and an alkoxyl group bonded to at least one of the silicon atoms (n), wherein the spherical polymethylsilsesquioxane particle satisfies the following expression (1): Expression (1) S1/S2≥8.0, in the expression (1), S1 represents a specific surface area (m2/g) measured by a nitrogen adsorption BET one-point method, S2 represents 6/(ρ×D50) and a unit thereof is (m2/g), ρ represents a particle density (g/m3), and D50 represents a volume-based 50% cumulative diameter (m) measured by a laser diffraction/scattering method.

    Silicone oil-treated silica particles and toner for electrophotography
    2.
    发明授权
    Silicone oil-treated silica particles and toner for electrophotography 有权

    公开(公告)号：US10095145B2

    公开(公告)日：2018-10-09

    申请号：US15545684

    申请日：2016-01-21

    申请人： TOKUYAMA CORPORATION

    发明人： Yuya Yamano ,  Masahiro Nakamura ,  Tadaharu Komatsubara

    IPC分类号： G03G9/097 ,  C01B33/18 ,  G03G9/087

    摘要： A silicone oil-treated silica particle according to the present invention includes a silica particle body and silicone oil. The silica particle body has a BET specific surface area of 70 m2/g to 120 m2/g. The silica particle body has been surface-treated with the silicone oil. The amount of free silicone oil liberated from the surface of the silica particle body in the silicone oil accounts for 2.0 mass % to 5.0 mass % with respect to the silica particle body. A surface-treated styrene acrylic resin particle, in which 2 parts by mass of the silicone oil-treated silica particle has been added to 100 parts by mass of a styrene acrylic resin particle having a particle size median of 5 μm to 8 μm, has a degree of agglomeration of 18% or less.