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US 2007/0190305 A1Published application
Coating material composition and article having coating film formed therewith
AssigneeMatsushita Electric Works, Ltd.
InventorsTakeyuki Yamaki, Hiroshi Yokogawa, Koichi Takahama, Masaru Yokoyama, Akira Tsujimoto, Norihiro Itou, Kenji Kawano, Yasuhisa Kishigami, Nobuhiro Ide
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Abstract
The present invention provide a coating material composition comprising at least fine hollow particles and a matrix-forming material, wherein when the coating material composition is applied and dried to form a coating film having a low refractive index, the matrix-forming material forms a porous matrix.
Claims15
A process for producing an article having a coating film with a refractive index between 1.1 and 1.35, which process comprises:
- obtaining a matrix forming-material which comprises a partially hydrolyzed compound and/or a completely hydrolyzed compound having a weight average molecular weight of 2000 or more by hydrolyzing a tetraalkoxysilane represented by SiX4 (X═OR, R is a monovalent hydrocarbon group) in the presence of water of which amount is such that a molar ratio of [H2O]/[OR] is in the range between 1.0 and 5.0, and in the presence of an acid catalyst,
- obtaining a coating material composition by blending the matrix forming-material and at least fine hollow particles in a weight ratio of the matrix-forming material to the fine hollow particles between 95/5 and 30/70, and
- applying the coating material composition on a surface of the article followed by its drying so that the coating film is formed in which the matrix forming-material forms a porous matrix.
Dependencies are inferred from the claim text.