Sol having fine particles dispersed and method for preparing
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United States of America Patent
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Jan 20, 2004
Grant Date -
N/A
app pub date -
Jun 21, 2001
filing date -
Dec 21, 1998
priority date (Note) -
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Abstract
The porous composite oxide particle is coated with a porous silica-based inorganic oxide layer, and also a substrate has a coating film with the fine particles thereon, which has a low refractive index and excellent in adhesion with a resin or the like, strength, the ability to reduce reflection and the like. The fine particles include porous composite oxide with silica and an inorganic oxide other than silica, wherein the fine particles are coated with a porous silica-based inorganic oxide layer having a thickness from 0.5 to 20 nm. The fine particles include preferably an organic group directly bonded to silicon, and S.sub.R /S.sub.T, the ratio of the molar amount of silicon having the organic group directly bonded thereto (S.sub.R) vs the molar amount of the total silicon (S.sub.T), is preferably in the range from 0.001 to 0.9.
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