| http://www.w3.org/ns/prov#value | - The preferred organic silicon compound is at least one silane compound which has been hydrolyzed, the silane compound having the general formula (1) as follows: ##STR1## wherein R1 is an organic group containing at least one group selected from vinyl, propyl, butyl, amino, imino, epoxy, methacryloxy, glycidoxy, phenyl and SH group, R2 is hydrogen, a hydrocarbon group having from one to six carbon
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