Patent GB-1520904-A (GB)
Title: Compounds containing relesable photographically useful moieties
IPC: C07C239/00
Filed: 1975-10-02
Abstract: 1520904 Photographic material containing compound releasing photographically useful moieties EASTMAN KODAK CO 2 Oct 1975 [2 Oct 1974] 40348/75 Heading G2C [Also in Divisions C2 and C4] A photographic material comprises a support bearing at least one alkali-permeable layer comprising a non-diffusing compound comprises an electrophilic cleavage group (N-E-Q) linking a photographically useful moiety to a ballast moiety and comprises a nucleophilic group or hydrolysable precursor therefor which is capable of (1) interaction with the electrophilic cleavage group to release the photographically useful moiety in a diffusible form under alkaline conditions and (2) reacting with oxidized silver halide developing agent before release of the photographically useful moiety occurs to lower the rate of release of the moiety under alkaline conditions, and the compound has the Formula:- where Nu is an oxidizable nucleophilic group or a precursor therefor; E is CO or CS; Q is O, S or NR; R is H, alkyl, substituted alkyl, cycloalkyl or an aromatic group containing 5-20C; G<SP>1</SP> is OH or a precursor therefor, NH 2  or a precursor therefor, hydroxylamino, sulphonamide, or a substituted amino group; R<SP>6</SP> is a bivalent alkylene containing 1-3C in the bivalent linkage which may be substituted; n is 1 or 2; R<SP>1</SP> is an aromatic group containing 6-20C or alkylene containing 1-12C which may be substituted; R<SP>2</SP> is alkyl containing 1-40C which may be substituted, cycloalkyl, aryl containing 6- 40C which may be substituted, or the substituent X<SP>1</SP>; each of R<SP>3</SP>, R<SP>4</SP> and R<SP>5</SP> is H, halogen or a polyatomic group which is alkyl, which may be substituted, cycloalkyl, aryl which may be substituted, carboxylic acyl, alkoxy, sulphamyl, sulphonamido or X<SP>1</SP>, or R<SP>3</SP> and R<SP>5</SP> or R<SP>4</SP> and R<SP>5</SP>, when on adjacent positions on the ring and taken together, form a 5-, 6- or 7-membered ring with the remainder of the molecule, provided that, when R<SP>1</SP> is alkylene, each of R<SP>3</SP> and R<SP>4</SP> is a polyatomic group, and when G<SP>1</SP> is a substituent as defined for Nu, an adjacent R<SP>3 </SP>or R<SP>4</SP> is -(R<SP>6</SP>) n-1 -N(R<SP>2</SP>)-E(Q-R<SP>1</SP>-X 2 ); X<SP>1</SP> is a ballasting group to make the compound immobile in an alkali-permeable layer of a photographic material or X<SP>1</SP> is a photographically useful moiety which is an image dye-providing material or a photographic reagent; X2 is a group which together with Q and R<SP>1</SP>, is a ballasting group or a photographically useful group as defined for X<SP>1</SP>, provided one of X<SP>1</SP> and (QR<SP>1</SP>X 2 ) is the ballasting group and one of X<SP>1</SP> and (QR<SP>1</SP>X 2 ) is the photographically useful group. In all the specified compounds E is CO and Q is O. The photographic material may be a receiver material which is contacted with a photographic silver halide material during processing in the presence of an alkaline solution and a developing agent. If the nucleophilic displacement compound contains a tanning agent as the photographically useful moiety a tanned image may be obtained in undeveloped areas. The photographic material may be designed to provide an image using either the image dye-providing material released or the immobile image dye-providing material remaining in its initial location, or both. The photographically useful moiety may be a silver halide development inhibitor, anti-foggant, silver halide development accelerator, foggant, auxiliary developer, silver halide complexing agent, toner, hardener, coupler, sensitizer, de-sensitizer, developer or oxidizing agent.