Patent ID: 7767264

Claim:
A method for producing a resin substrate coated with a titanic acid film characterized in that it comprises applying, onto a resin substrate, a suspension of a lamellar titanic acid obtained by treating a layered titanate with an acid or warm water to produce a layered titanic acid, allowing a basic compound having an interlayer space swelling effect to act on the layered titanic acid to thereby effect swelling of spaces between layers of the layered titanic acid or to effect delamination thereof, and (1) removing excess basic compound by washing with water, or (2) neutralizing excess basic compound with at least one acid selected from phosphoric acids, water-soluble carboxylic acid compounds, a boric acid and a carbonic acid gas; and subjecting the suspension of the lamellar titanic acid on the resin substrate to a heat treatment at a temperature of below a softening point of the resin substrate to thereby form a titanic acid film on the resin substrate.