Jgc Catalysts & Chemicals Ltd.

Ryota Sueyoshi

Toshiharu Hirai

Mitsuaki Kumazawa

Masayuki Matsuda

Ryo Muraguchi

Ryo Maruguchi

A composition for forming a transparent coating film including hollow silica microparticles and a binder is provided. The hollow silica microparticles have an average particle diameter of 5 to 300 nm when measured by the dynamic light scattering method, a specific surface area of 50 to 1500 m/g, and an outer shell in which cavities are formed. The microparticles lose weight by 1.0 W % or more at a temperature in the range of from 200&#xb0; C. to 500&#xb0; C. when measured by the thermogravimetry (TG). A surface charge (QA) of the hollow silica microparticles contained in the compositions for forming a transparent coating film is in the range from 5 to 20 &#x3bc;eq/g.

Composition for forming a transparent coating film including hollow silica particles

A method of producing hollow silica microparticles that suppress whitening of a transparent coating film and show excellent abrasion resistance and adhesiveness. The method includes preparation of an organosol in which hollow silica microparticles are dispersed with the silica concentration of 1 to 70 W % and addition of a silane compound and an alkali catalyst to the organosol at a temperature in the range from 30&#xb0; C. to 300&#xb0; C. to react the silane compound to the hollow silica microparticles under the condition where a quantity of water against the added silica (the hollow silica microparticles) is in the range from 0.1 to 50 W %.

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Kitakyushu, Japan

Ryota Sueyoshi