ARTICLE WITH ORGANIC/INORGANIC COMPOSITE COATING FORMED AND PROCESS FOR PRODUCING THE SAME

摘要

An article with organic/inorganic composite coating formed, wherein the organic/inorganic composite coating is composed mainly of silica and will not be detached from the base material after Taber's abrasion resistance test prescribed in Japanese Industrial Standards (JIS) R 3212. This composite coating can be formed by a sol gel process from a coating liquid containing a hydrophilic organic polymer. In this liquid, for example, the amount of silicon alkoxide in terms of SiO2concentration exceeds 3 mass%. When a phosphorus supply source is contained, the mass molarity of proton is in the range of 0.0001 to 0.2 mol/kg, and the molar amount of water is at least 4 times the total molar amount of silicon atoms contained in the silicon alkoxide. According to this sol gel process, there can be obtained a coating excelling in mechanical strength without the need to heat the base material to temperature higher than 400‹C and even when the coating thickness is as large as over 250 nm. ® KIPO & WIPO 2007