Stable dispersions for use in photographic film having an opaque

Details Stable dispersions for use in photographic film having an opaque Stable dispersions for use in photographic film having an opaque

1982-08-02

1984-10-30

Brown, J. Travis

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Antihalation or filter layer containing

430523, 523351, 524503, 525 56, G03C 184

Patent

active

044800266

ABSTRACT:
In preparing an opaque backing layer for a photographic film, superior covering power and coating dispersion stability are obtained by (1) dispersing carbon black in a minor phase of polyvinyl pyrrolidone/vinyl acetate copolymer before addition of a major phase of polyvinyl alcohol, and (2) delaying the addition of surfactant or coating aids until after complete mixing of the polyvinyl alcohol with the solid carbon black dispersion. This coating dispersion is particularly useful for the preparation of a dischargeable opaque backing layer for a diffusion transfer film element.

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patent: 4357416 (1982-11-01), Fan

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