Dye diffusion transfer employing pyridine azo dye

US4139383A · kind A · utility

Assignee

• Agfa-Gevaert NV · BE

Inventors

• Heinrich Odenwalder · Leverkusen, DE
• Walter Puschel · Leverkusen, DE
• Rudolf Stolzenburg · Goldkronach, DE

Key dates

• Filing date: Nov 14, 1977
• Grant date: Feb 13, 1979
• Expiry date: Nov 14, 1997

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09B29/3621
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Non-diffusible dye-providing compounds for the dye diffusion transfer process yielding yellow to red color images of wanted absorption characteristics and improved light fastness correspond to the formula EQU (A.sup.1).sub.n -- D -- N .dbd. N -- Py -- (A.sup.1).sub.1-n in which PA1 A.sup.1 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 D represents a heterocyclic or carbocyclic aromatic group; PA1 Py represents a pyridine or 1,2-dihydropyridine group which is attached to the azo group through its 3-position and carries an amino or hydroxyl group in its 6-position; PA1 N = 0 or 1.