Combination of two timing layers for photographic products

Details Combination of two timing layers for photographic products Combination of two timing layers for photographic products

1976-04-14

1977-12-06

Klein, David

Gas separation: apparatus

Electric field separation apparatus

Electrode cleaner, apparatus part flusher, discharger, or...

96 3, 96 73, 96 77, 428507, 428510, 428520, G03C 700, G03C 554, G03C 140, G03C 176

Patent

active

040614964

ABSTRACT:
A temporary barrier between reactants in photographic products and especially for color diffusion transfer film units comprises two contiguous layers, one layer comprising a polymeric timing layer and having an activation energy of penetration of the layer by an aqueous alkaline solution of less than 18 kcal/mole and the second layer comprising a coalesced or partially coalesced polymeric latex and having an activation energy for the process of penetration of the layer by an aqueous alkaline solution of greater than 18 kcal/mole.

REFERENCES:
patent: B351673 (1975-01-01), Fleckenstein et al.
patent: 3455686 (1969-07-01), Farney et al.
patent: 3592645 (1971-07-01), Weyerts et al.
patent: 3615422 (1971-10-01), Haberlin et al.
patent: 3625685 (1971-12-01), Autges et al.
patent: 3785815 (1974-01-01), Autges et al.
patent: 3847615 (1974-11-01), Yoshida et al.

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