Diffusion retarding layers comprising polymers of dimethoxyethyl

Details Diffusion retarding layers comprising polymers of dimethoxyethyl Diffusion retarding layers comprising polymers of dimethoxyethyl

1975-11-20

1978-05-09

Kimlin, Edward C.

Gas separation: apparatus

Electric field separation apparatus

Plural diverse electric fields

96 3, 96 29D, G03C 140, G03C 700, G03C 554

Patent

active

040884937

ABSTRACT:
A neutralization system for the dye diffusion transfer process comprises an acid polymer layer containing a polymer with free acid groups and a retarding layer. The retarding layer contains a hydratable polymer which in its non-hydrated state is a barrier for hydroxyl ions and in its hydrated state provides no resistance for diffusing hydroxyl ions. The retarding layer is arranged between a laminate consisting of a light-sensitive film unit comprising at least a light-sensitive silver halide emulsion layer and a non-diffusible dye giving compound associated with the light-sensitive silver halide emulsion layer. The retarding layer allows a first high pH value to be maintained during a first time interval which is sufficient and necessary for producing the desired image density in the image receiving layer and thereafter a second low pH value to be adjusted within a second time interval which is less than half as long as the first. Suitable polymers for the retarding layer are homo-, co- and graftpolymers of 1,2-dimethoxyethylene.

REFERENCES:
patent: 3419389 (1968-12-01), Haas et al.
patent: 3421893 (1969-01-01), Taylor
patent: 3433633 (1969-03-01), Haas
patent: 3455686 (1969-07-01), Farney et al.
patent: 3575700 (1971-04-01), Taylor
patent: 3615422 (1971-10-01), Hablerin
patent: 3785815 (1974-01-01), Avtges et al.
patent: 3847615 (1974-11-01), Yoshida et al.

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