Process for incorporation of a water-insoluble substance into a

Details Process for incorporation of a water-insoluble substance into a Process for incorporation of a water-insoluble substance into a

1994-04-14

1994-12-27

Van Le, Hoa

Radiation imagery chemistry: process, composition, or product th

Stripping process or element

Forming composite image, e.g., multiple stripped image...

430259, 430523, 430533, 430537, 430933, G03C 176

Patent

active

053765010

ABSTRACT:
Processes are disclosed for incorporating a water-insoluble substance in a diffusion resistant form into a hydrophilic colloidal layer of an element. In a first process A the water-insoluble substance is present during the polycondensation of diol(s) or polyol(s) and carboxylic acids, whereby at least 6 mole % of the reagents bear a water-solubilizing group, preferably a sulpho group in the salt form; the obtained mixture of polyester and water-insoluble substance is then dispersed in an aqueous medium. In an alternative process B the polyester is first prepared and then mixed homogeneously with the hydrophobe substance by melting in a reactor or extruder; the mixture is then similarly dispersed. The obtained latex is then incorporated in a hydrophilic colloidal layer which is coated on a support.
The obtained element can serve as base for a reprographic image, e.g. a color proof image, or can form part of a complete photographic material.
In a preferred embodiment the water-insoluble substance is a brightening agent.

REFERENCES:
patent: 3418127 (1968-12-01), Millikan
patent: 3989664 (1976-11-01), Kawase et al.
patent: 4910235 (1990-03-01), Satake et al.

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