Anti-reflection coatings for photographic bases

Abstract

Transparent elements useful as supports for photographic image-carrying and/or image-recording layers are provided comprising a polymeric film base having an anti-reflection coating on one surface. Image-carrying and/or image-recording layers may be coated on the opposed surface. Such transparent supports are particularly useful in photographic products wherein the final image is formed by multicolor diffusion transfer processes using dye developers or other image dye-providing materials. In the preferred embodiments, the photographic image is an integral negative-positive reflection print. Where photoexposure is effected through a transparent support, e.g., the transparent support through which the final image is viewed, provision of an anti-reflection coating on said support and effecting photo-exposure therethrough will permit more effective recording of light passing through the camera lens. The polymeric film base of the transparent element has an index of refraction of at least 1.6, and the anti-reflection coating comprises a fluorinated polymer and has an optical thickness of a quarter wave. More uniform anti-reflection coatings are obtained by including a polydimethyl siloxane in the fluorinated polymer coating solution.

Dependencies are inferred from the claim text.