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US 4,735,869 AGranted
Optical film
AssigneeMerck Patent GmbH
InventorYoshio Morita
Life of this patent
Estimating the term…
Abstract
Process of forming a titanium dioxide film with controlled optical thickness on a surface comprising a pretreating step, at least one film-forming step and optionally a nucleation step between the pretreating and film-forming step, and articles coated with such a film.
Claims15
A process of forming a titanium dioxide film with controlled optical thickness on a surface comprising:
- (a) pretreating said surface by soaking in an aqueous solution containing an effective amount of a ferrous, ferric, stannous or stannic salt, or a mixture thereof;
- and
- (b) at least one film-forming step comprising, soaking said deposit obtained in step (a) in an acidic aqueous solution containing at least 0.3 millimole Ti/l.
A process of forming a substantially uniform titanium dioxide film with controlled optical thickness on a surface comprising:
- (a) pretreating said surface by heating in an acidid aqueous solution of an effective amount of a water-soluble titanium ester or titanium salt, thereby forming a deposit on said surface;
- and
- (b) at least one film-forming step comprising, after removal of said surface from said solution, soaking said deposit obtained in step (a) in an acidic aqueous solution containing at least 0.3 millimole Ti/l.
Dependencies are inferred from the claim text.