Restraining layer for retarding the diffusion of hydroxyl ions i

Details Restraining layer for retarding the diffusion of hydroxyl ions i Restraining layer for retarding the diffusion of hydroxyl ions i

1977-01-12

1979-04-10

Schilling, Richard L.

Gas separation: apparatus

Electric field separation apparatus

Plural diverse electric fields

96 3, 96 29D, 96119R, 428412, 428425, 428480, 428481, 428483, G03C 140, G03C 554, G03C 700, B44D 109

Patent

active

041486536

ABSTRACT:
A restraining layer capable of retarding the diffusion of hydroxyl groups is of particular use in a neutralization system for the dye diffusion transfer process. The restraining layer of the invention comprises a film-forming linear polymer consisting of alternating hydrophilic and hydrophobic segments joined to one another by carbonate, urethane and/or ester groups. The neutralization system provides retarded reduction of pH in the photographic material.

REFERENCES:
patent: 2948691 (1960-08-01), Windemuth et al.
patent: 3362819 (1968-01-01), Land
patent: 3421893 (1969-01-01), Taylor
patent: 3455686 (1969-07-01), Farney et al.
patent: 3615422 (1971-10-01), Hablerin
patent: 3730718 (1973-05-01), Danhauser et al.
"Neutralizing Materials in Photographic Elements", Research Disclosure #12331, 7/1974.

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