Photographic negative base for self-developing film packs

Details Photographic negative base for self-developing film packs Photographic negative base for self-developing film packs

1980-04-11

1982-01-26

Lesmes, George F.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Structurally defined

428219, 428513, 428913, 430215, 430220, 430517, 430527, 430536, 430538, G03C 186, B32B 2708

Patent

active

043129374

ABSTRACT:
This disclosure relates to production of a photographic film assembly substantially free of optical pinholes for use as a base for negatives in self-developing film packs. The assembly comprises a paper layer and first and second layers of polyolefin adhered to opposite sides of the paper layer. The paper layer has a caliper of about 2 mils to about 4.5 mils and a basis weight of about 55 g/m.sup.2 to about 125 g/m.sup.2. The first and second polyolefin layers each have a layer weight of about 10 g/m.sup.2 to about 48 g/m.sup.2. Carbon black is uniformly dispersed in at least two out of the three layers. The total amount of carbon black in the assembly is about 2.5 g/m.sup.2 to about 4.0 g/m.sup.2.

REFERENCES:
patent: 3501298 (1970-03-01), Crawford
patent: 3525621 (1970-08-01), Miller
patent: 3676175 (1972-07-01), Woodward
patent: 3753764 (1973-08-01), Haefner
patent: 3758376 (1973-09-01), Beckner
patent: 4145480 (1979-03-01), Kusama et al.
patent: 4188220 (1980-02-01), Kasugai

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