Appeal No. 2004-2278 Page 2
Application No. 09/302,471
INTRODUCTION
Claims 7 and 13 are illustrative of the subject matter on appeal:
7. A method for the preparation of a coating solution which comprises the steps of:
(a) dissolving a polyalkoxy silane compound represented by the general formula
R14-nSi(OR2)n,
in which R1 is a hydrogen atom or a monovalent hydrocarbon group, R2 is an alkyl group and the
subscript n is 2, 3 or 4, in a first organic solvent, which is an alcohol solvent, to give a solution,
in a concentration in the range from 1 to 5% by weight calculated as SiO2;
(b) admixing the solution with a basic compound and water to effect hydrolysis of the
polyalkoxy silane compound so as to give an organopolysiloxane as a hydrolysis-condensation
product thereof; and
(c) replacing the first organic solvent in the solution with a second organic solvent, which
is an aprotic polar organic solvent, in such an amount that the concentration of the
organopolysiloxane in the solution is in the range from 5 to 25% by weight calculated as SiO2.
13. A method for the formation of a silica-based coating film on the surface of a substrate
which comprises the steps of:
(1) coating the surface of a substrate with a coating solution comprising, as a uniform
solution,
(A) an organic solvent, and
(B) an organopolysiloxane, which is a hydrolysis-condensation product of a
polyalkoxy silane compound represented by the general formula
R1
4-nSi(OR2)n,
in which R1 is a hydrogen atom or a monovalent hydrocarbon group, R2 is an alkyl group and the
subscript n is 2, 3 or 4, dissolved in the organic solvent in the presence of a basic compound, to
form a coating layer;
(2) drying the coating layer by heating to form a dried coating layer;
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Last modified: November 3, 2007