Method for preparing physical development nuclei for use in silv

Details Method for preparing physical development nuclei for use in silv Method for preparing physical development nuclei for use in silv

1996-09-12

1998-01-13

Schilling, Richard L.

Radiation imagery chemistry: process, composition, or product th

Transfer procedure between image and image layer, image...

Diffusion transfer process, element, or identified image...

430231, 430232, 430247, 423266, 4235661, 4235611, G03C 806, G03C 828, G03F 707

Patent

active

057077746

ABSTRACT:
According to the present invention, a method is provided for preparing physical development nuclei for use in silver salt diffusion transfer processing, said physical development nuclei comprising a heavy metal sulphide, said method comprising the steps of:
precipitating said heavy metal sulphide by bringing a water soluble heavy metal compound in reactive association with a water soluble sulphide in an aqueous liquid and
said precipitation being carried out in the presence of a hydrophilic polymer so as to disperse said heavy metal sulphide, said hydrophilic polymer comprising a heterocyclic group, characterized in that said heterocyclic group is present in a recurring unit of said hydrophilic polymer, said recurring unit being comprised in said polymer in an amount between 0.1 mol % and 5 mol %.

REFERENCES:
patent: 4160670 (1979-07-01), Tsubai et al.
patent: 5153097 (1992-10-01), Nishinoiri et al.
patent: 5236802 (1993-08-01), Yamano et al.
patent: 5437957 (1995-08-01), Yamano et al.
patent: 5445915 (1995-08-01), Vaes

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