Patent ID: 8592521

Claim:
A method for preparing a primer composition for forming a polysiloxane hard film, which method comprises the following steps (I) to (III): (I) preparing a primer precursor containing a vinyl polymer (A) having a hydrolysable silyl group and an organic UV absorbing group bonded at side chains thereof and silica fine particles (B) dispersed in an organic solvent; (II) adding water in an amount of from 0.1 to less than 5 moles per mole of the hydrolyzable silyl group in the vinyl polymer (A) to said primer precursor obtained in (I) for hydrolysis; and (III) adding a dehydrating agent (C) in an amount of 1 to 20 moles per mole of water to said composition containing the hydrolyzate obtained in (II) to remove moisture from said composition.