To renew a waterresisting photoreflective sheet while efficient antifouling, deodorizing and antibacterial functions are provided by a method wherein an active layer containing titanium oxide or the like, and a separable pressure sensitive adhesive layer are provided on a flexible base material which is free from gas permeability.
An active layer containing at least titanium oxide and colloidal silica composite thermoplastic high polymeric emulsion are applied onto a flexible base material which is free from gas permeability. A colloidal silica layer is formed as the active layer, and deterioration of an optical catalytic function and degradation of high polymer component are restrained. Then, the colloidal silica composite thermoplastic high polymeric emulsion is effectively used as a binding agent for fixing titanium oxide onto the base material. As the base material, synthetic resin materials of polyethylene, polypropylene, etc., are used. Since the pressure sensitive adhesive layer is provided onto a rear surface of the base material, that which has gas permeability is unsuitable as the base material so that an optically reacted product on the active layer side does not transfer to the rear surface.
HIOKI SHINYA
AZUMA YOICHIRO
