Silver halide photographic light-sensitive systems comprising a hydrazine which contains a group undergoing a cyclization reactionupon cleavage from the hydrazine

Claim 2

A silver halide photographic light sensitive emulsion containing a hydrazine of the general formula R.sup.3 -NR.sup.4 -NR.sup.5 -G-X (I) in which: R 3 represents an aryl group, one of R 4 and R 5 is a hydrogen and the other is selected from hydrogen, aryl sulfonyl and trifluoroacetyl, G represents carbonyl, sulfonyl, sulfoxy, phosphoryl or an N-substituted or unsubstituted imino group and X is a moiety such that at a pH in the range of 9.5 to 12.5 in the presence of an oxidised hydroquinone a cylisation reaction takes place cleaving the moiety -G-X from the remainder of the molecule and forming a cyclic structure comprising atoms of the moiety -G-X in a ring of said cyclic structure.

Claim 3

A silver halide photographic light sensitive emulsion containing a hydrazine of the general formula R.sup.3 -NH.sup.4 -NH.sup.5 -G X (I) in which: R 3 represents an aryl group, one of R 4 and R 5 is a hydrogen and the other is selected from hydrogen, aryl sulfonyl and trifluoroacetyl, G represents carbonyl, sulfonyl, sulfoxy, phosphoryl or an N-substituted or unsubstituted imino group and X is a moiety such that at a pH in the range of 9.5 to 12.5 in the presence of an oxidised hydroquinone a cyclisationr eaction takes place cleaving the moiety -G-X from the remainder of the molecule and forming a cyclic structure comprising atoms of the moiety -G-X in which X represents ##STR24## in which: R 6 and R 9 are independently selected from H, alkyl of up to 12 carbon atoms or aryl of up to 12 carbon atoms, A represents the necessary atoms to complete a 5-or 6-member ring which may possess substitutents, Y represents OH, BH or NHR 10 in which R 10 is H alkyl of up to 12 carbon atoms, or aryl of up to 12 carbon atoms n is 0 or 1, m is 0 or 1 and (n+m) is 1 or 2.

Claim 4

A silver halide photographic light sensitive emulsion containing a hydrazine of the general formula R.sup.3 -NH.sup.4 -NH.sup.5 -G X (I) in which: R 3 represents an aryl group, one of R 4 and R 5 is a hydrogen and the other is selected from hydrogen, aryl sulfonyl and trifluoroacetyl, G represents carbonyl, sulfonyl, sulfoxy, phosphoryl or an N-substituted or unsubstituted imino group and X is a moiety such that at a pH in the range of 9.5 to 12.5 in the presence of an oxidised hydroquinone a cyclisationr eaction takes place cleaving the moiety -G-X from the remainder of the molecule and forming a cyclic structure comprising atoms of the moiety -G-X in which X represents ##STR24## in which: R 6 and R 9 are independently selected from H, alkyl of up to 12 carbon atoms or aryl of up to 12 carbon atoms, A represents the necessary atoms to complete a 5-or 6-member ring which may possess substitutents, Y represents OH, BH or NHR 10 in which R 10 is H alkyl of up to 12 carbon atoms, or aryl of up to 12 carbon atoms n is 0 or 1, m is 0 or 1 and (n+m) is 1 or 2.

Claim 5

A silver halide photographic light sensitive emulsion containing a hydrazine of the general formula ##STR25## in which: R 3 to R 9 , G, A, Y, m and n are as defined in claim 1.

Claim 6

A silver halide photographic light sensitive emulsion as claimed in claim 2 in which A represents the necessary atoms to complete a benzene ring.

Claim 7

An emulsion as claimed in claim 1 in which G is C═0.

Claim 8

A silver halide photographic light sensitive emulsion containing a hydrazine of the general formula R.sup.3 -NR.sup.4 -NR.sup.5 -G-X (I) in which: R 3 represents an aryl group, one of R 4 and R 5 is a hydrogen and the other is selected form hydrogen, aryl sulfonyl and trifluoroacetyl, G represents carbonyl, sulfonyl, sulfoxy, phosphoryl or an N-substituted or unsubstituted imino group and X is a moiety such that at a pH in the range of 9.5 to 12.5 in the presence of an oxidised hydroquinone a cyclisation reaction takes place cleaving the moiety -G-X from the remainder of the molecule and forming a cyclic structure comprising atoms of the moiety -G-X in which -GX represents ##STR26##

Claim 9

A silver halide photographic light sensitive emulsion containing a hydrazine of the general formula R.sup.3 -NR.sup.4 -NR.sup.5 -G-X (I) in which: R 3 represents an aryl group, one of R 4 and R 5 is a hydrogen and the other is selected form hydrogen, aryl sulfonyl and trifluoroacetyl, G represents carbonyl, sulfonyl, sulfoxy, phosphoryl or an N-substituted or unsubstituted imino group and X is a moiety such that at a pH in the range of 9.5 to 12.5 in the presence of an oxidised hydroquinone a cyclisation reaction takes place cleaving the moiety -G-X from the remainder of the molecule and forming a cyclic structure comprising atoms of the moiety -G-X in which -GX represents ##STR26##

Claim 10

An emulsion as claimed in claim 1 in which R 3 represents a phenyl or naphthyl group either of which groups may be substituted with one or more substituents which are not electron attracting.

Claim 11

An emulsion as claimed in claim 6 in which the hydrazine is of the formula ##STR27## in which: t is 0 or an integer of 1 to 3, and R 11 represents alkyl of up to 12 carbon atoms, alkoxy of up to 12 carbon atoms, halogen or NHCOR 10 in which R 10 is as defined in claim 2.

Claim 12

An emulsion as claimed in claim 6 in which the hydrazine of formula (I) is 1-(2'-hydroxymethylbenzoyl)2-phenyl hydrazine.

Claim 13

An emulsion as claimed in claim 1 in which the hydrazine is present in an amount in the range 10 -6 to 10 -1 mol/mol Ag.

Claim 14

An emulsion as claimed in claim 1 which is a negative working surface latent image forming silver halide emulsion.

Claim 15

A photographic element comprising a support bearing one or more layers of an emulsion as claimed in claim 1.

Claim 16

A method of recording an image which comprises image wise exposing an element as claimed in claim 12 and developing the exposed element in a developer having a pH in the range 9.5 to 12.5.

Claim 17

A method as claimed in claim 13 in which the developer comprises a dihydroxybenzene.

Claim 18

An emulsion according to claim 2 in which said hydrazine is present in an amount in the range of 10 -6 to 10 -1 mole/mol Ag.

Claim 19

An emulsion according to claim 6 in which said hydrazine is present in an amount in the range of 10 -6 to 10 -1 mole/mol Ag.

Claim 20

An emulsion according to claim 2 which is a negative working surface latent image forming silver halide emulsion.

Claim 21

An emulsion according to claim 6 which is a negative working surface latent image forming silver halide emulsion.

Claim 22

An emulsion according to claim 1 in which said cyclic structure is a lactone or lactam.

Claim 23

An emulsion according to claim 2 in which said cyclic structure is a lactone or lactam.

Claim 24

An emulsion according to claim 6 in which said cyclic structure is a lactone or lactam.