Method of preventing the formation of contact spots on photograp

Details Method of preventing the formation of contact spots on photograp Method of preventing the formation of contact spots on photograp

1978-05-22

1981-02-03

Welsh, John D.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Structurally defined

430523, 430539, 430961, G03C 178, G03C 300

Patent

active

042489636

ABSTRACT:
In a process for preventing the contact spots formed by contact of the back coating of photographic material with the emulsion side an aqueous polymer dispersion obtained by polymerization of halogen-free compounds and polyvinyl alcohol or partially acetylated polyvinyl alcohol in the presence of an anionic emulsifier are added to the casting composition applied as outermost back coating and/or as uppermost layer.

REFERENCES:
patent: 2362580 (1944-11-01), Nadeau et al.
patent: 3079257 (1963-02-01), Morcher et al.
Bovey et al., Emulsion Polymerization, pp. 161-163, Interscience, N.Y. 1955.
Chemical Abstracts vol. 69, col. 78147x.

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