Process for incorporation of a water-insoluble substance into a hydrophilic layer

US5376501A · kind A · utility

Assignee

• Agfa-Gevaert NV · BE

Inventors

• August M. Marien · Oevel, BE
• Raf Voets · Boortmeerbeek, BE
• Rafael P. Samijn · Wilrijk, BE
• Marc P. Stevens · Belsele, BE

Key dates

• Filing date: Apr 14, 1994
• Grant date: Dec 27, 1994
• Expiry date: Apr 14, 2014

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S430/134
• WIPO field: Optics
• WIPO sector: Instruments

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.