Polymer particle coated with silica, method for producing the same and use of the same
AssigneeSekisui Plastics Co., Ltd.
InventorYuuji Noguchi
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Abstract
A polymer particle coated with silica comprising: a polymer particle derived from a polymerizable vinyl-based monomer; and a silica film covering the polymer particle, which makes a surface of the polymer particle expose so that an aperture ratio of 0.1 to 1 is possessed and a height h of the silica film and a diameter D of the polymer particle coated with silica have a relationship of 0.5≦h/D<1, wherein the silica film includes a polyalkoxysiloxane oligomer condensate.
Claims12
A spherical or approximately spherical particle comprising:
- a polymer particle derived from a polymerizable vinyl-based monomer;
- and
- a silica film covering the polymer particle, which makes a surface of the polymer particle exposed so that an aperture ratio of 0.1 to 1 is possessed and a height h of the silica film and a diameter D of the polymer particle coated with silica have a relationship of 0.5≦h/D<1, wherein the silica film includes a polyalkoxysiloxane oligomer condensate.
A coating composition comprising:
- a polymer particle coated with silica comprising a polymer particle derived from a polymerizable vinyl-based monomer, and a silica film covering the polymer particle, which makes a surface of the polymer particle exposed so that an aperture ratio of 0.1 to 1 is possessed and a height h of the silica film and a diameter D of the polymer particle coated with silica have a relationship of 0.5≦h/D<1, the silica film including a polyalkoxysiloxane oligomer condensate;
- and a binder solution, wherein the binder solution contains a binder resin and a solvent.
A light diffusible molded article comprising a transparent resin and a polymer particle coated with silica, wherein the polymer particle coated with silica comprises a polymer particle derived from a polymerizable vinyl-based monomer, and a silica film covering the polymer particle, which makes a surface of the polymer particle exposed so that an aperture ratio of 0.1 to 1 is possessed and a height h of the silica film and a diameter D of the polymer particle coated with silica have a relationship of 0.5≦h/D<1, and the silica film includes a polyalkoxysiloxane oligomer condensate.
A method for producing a polymer particle coated with a silica film which makes a surface of the polymer particle exposed so that an aperture ratio of 0.1 to 1 is possessed, and a height h of the silica film and a diameter D of the polymer particle coated with silica have a relationship of 0.5≦h/D<1, the method comprising, in the following order, the steps of:
- uniformly mixing 100 parts by weight of a polymerizable vinyl-based monomer, 10 to 500 parts by weight of a polyalkoxysiloxane oligomer which is inert to the polymerizable vinyl-based monomer, and 0.01 to 10 parts by weight of a polymerization initiator to obtain a monomer composition;
- aqueous suspension-polymerizing the polymerizable vinyl-based monomer in the monomer composition in the presence of a suspension stabilizer to obtain a polymer particle;
- and
- adding an acid or base catalyst to condense the polyalkoxysiloxane oligomer.
Dependencies are inferred from the claim text.