Patent ID: 7932295

Claim:
A composition comprising an organic silica sol having a carbon content of 11.8 to 16.7 mol %, and an organic solvent, the organic silica sol being a hydrolysis-condensation product produced by hydrolysis and condensation of one or more silane compounds selected from compounds shown by the following general formulae (1) to (4), R 1 Si(OR 2 ) 3 (1) wherein R 1 represents an alkyl group or an aryl group, and R 2 represents an alkyl group or an aryl group, Si(OR 3 ) 4 (2) wherein R 3 represents an alkyl group or an aryl group, (R 4 ) 2 Si(OR 5 ) 2 (3) wherein R 4 represents an alkyl group or an aryl group, and R 5 represents an alkyl group or an aryl group, and R 6 b (R 7 O) 3-b Si—(R 10 ) d —Si(OR 8 ) 3-c R 9 c (4) wherein R 6 to R 9 individually represent an alkyl group or an aryl group, b and c individually represent integers from 0 to 2, R 10 represents an oxygen atom, a phenylene group, or a group —(CH 2 ) m — (wherein m represents an integer from 1 to 6), and d represents 0 or 1.