Photographic dye diffusion transfer process

US4171220A · kind A · utility

Assignee

• AGFA-Gervaert AG · DE

Inventors

• Hans Vetter · Kempten (Allgäu), DE
• Walter Puschel · Leverkusen, DE
• Paul Marx · Corning, US

Key dates

• Filing date: Nov 14, 1977
• Grant date: Oct 16, 1979
• Expiry date: Nov 14, 1997

Classification

• Technology area (CPC G): Physics
• CPC primary: G03C8/10
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

Non-diffusible dye-providing compounds for the dye diffusion transfer process yielding color images of wanted absorption characteristics and improved light fastness correspond to the formula EQU (A).sub.n -P-N=N-B-(A).sub.1-n in which PA1 A represents an oxidizable organic carrier residue which may be attached through a connecting member X and containing a group which confers diffusion resistance, from which carrier residue, either in its oxidized or in its unoxidized form, a part is split off together with the group which confers diffusion resistance under alkaline photographic development conditions, a diffusible azo dye represented by the formula P--N.dbd.N--B being released imagewise at the same time; PA1 P represents a monocyclic, carbocyclic aromatic group; PA1 B represents a bicyclic, carbocyclic aromatic group which carries a sulphonamide group in the p-position to the azo group; PA1 N=0 or 1.