Polymeric film base carrying fluoropolymer anti-reflection coati

Details Polymeric film base carrying fluoropolymer anti-reflection coati Polymeric film base carrying fluoropolymer anti-reflection coati

1975-08-06

1977-09-06

Hoffman, James R.

Coating processes

Electrical product produced

Integrated circuit, printed circuit, or circuit board

427164, 428333, B05D 704, B05D 506, G02B 108, B32B 2708

Patent

active

040464571

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 photoexposure 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.

REFERENCES:
patent: 2207656 (1940-07-01), Cartwright
patent: 2220861 (1940-11-01), Blodgett
patent: 2331716 (1943-10-01), Nadean
patent: 2391127 (1945-12-01), Carver
patent: 3356522 (1967-12-01), Libbert
patent: 3617354 (1971-11-01), Carnahan
patent: 3711176 (1973-01-01), Alfrey
patent: 3728124 (1973-04-01), Whyte
patent: 3793022 (1974-02-01), Land et al.
patent: 3833368 (1974-09-01), Land et al.

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