Layer delaying the diffusion of the hydroxyl ions during a process of transfer and diffusion of colorant

摘要

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.