| 摘要 |
PURPOSE:To provide the titled compsn. which can form a film at room temp. and can be converted into a vitreous material at a high temp. to form an insulator, containing an alkyl or aryl silicate and an inorg. boron compd. as essential components. CONSTITUTION:A film-forming compsn. contains a mixture of 5-95wt% alkyl or aryl silicate (e.g. methyl orthosilicate or phenyl orthosilicate) and 95-5wt% inorg. boron compd. (e.g. B2O3 or H3BO4) as an essential component. This compsn. has excellent thick-coatability and can be easily applied by brushing, spray coating or bar coating. The formed film can be dried at room temp. and the dried film has excellent adhesion at room temp., is hardly peeled off and can be converted into a vitreous material at a temp. of 600 deg.C or above to form an insulator. When the compsn. is applied to a ceramic board, a vitreous insulating film is formed thereon.
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