High contrast photographic element and emulsion and process for their use

Claim 2

A photographic recording material capable of providing a high contrast silver image which comprises a support having thereon a negative-working silver halide emulsion layer and a hydrazide compound having one of the following structural formulae: ##STR25## wherein; R is alkyl having from about 8 to about 16 carbon atoms or a heterocyclic ring having 5 or 6 ring atoms, including ring atoms of sulfur or oxygen; R 1 is alkyl or alkoxy having from 1 to about 12 carbon atoms; X is alkyl, thioalkyl or alkoxy having from 1 to about 5 carbon atoms; halogen; or --NHCOR 2 , --NHSO 2 R 2 , --CONR 2 R 3 or --SO 2 R 2 R 3 where R 2 and R 3 , which can be the same or different, are hydrogen or alkyl having from 1 to about 4 carbon atoms; and n is 0, 1 or 2.

Claim 3

The photographic recording material of claim 1 wherein R 1 is alkyl or alkoxy of from 1 to about 5 carbon atoms.

Claim 4

The photographic recording material of claim 1 wherein R is a thienyl or a furyl group.

Claim 5

The photographic recording material of claim 1 wherein the hydrazide compound has the structural formula: ##STR26##

Claim 6

The photographic recording material of claim 1 wherein the hydrazide compound has the structural formula: ##STR27##

Claim 7

The photographic recording material of claim 1 wherein the hydrazide compound has the structural formula: ##STR28##

Claim 8

The photographic recording material of claim 1 wherein the hydrazide compound has the structural formula: ##STR29##

Claim 9

The photographic recording material of claim 1 wherein the hydrazide compound has the structural formula: ##STR30##

Claim 10

The photographic recording material of claim 1 wherein the hydrazide compound has the structural formula: ##STR31##

Claim 11

The photographic recording material of claim 1 wherein the hydrazide compound has the structural formula: ##STR32##

Claim 12

A photographic emulsion comprising negative working silver halide and a hydrazide nucleating compound having one of the following structural formulae: ##STR33## wherein; R is alkyl having from about 8 to about 16 carbon atoms or a heterocyclic ring having 5 or 6 ring atoms, including ring atoms of sulfur or oxygen; R 1 is alkyl or alkoxy having from 1 to about 12 carbon atoms; X is alkyl, thioalkyl or alkoxy having from 1 to about 5 carbon atoms; or halogen; or --NHCOR 2 , --NHSO 2 R 2 , --CONR 2 R 3 or --SO 2 R 2 R 3 where R 2 and R 3 , which can be the same or different, are hydrogen or alkyl having from 1 to about 4 carbon atoms; and n is 0, 1 or 2.

Claim 13

A photographic emulsion comprising negative working silver halide and a hydrazide nucleating compound having one of the following structural formulae: ##STR33## wherein; R is alkyl having from about 8 to about 16 carbon atoms or a heterocyclic ring having 5 or 6 ring atoms, including ring atoms of sulfur or oxygen; R 1 is alkyl or alkoxy having from 1 to about 12 carbon atoms; X is alkyl, thioalkyl or alkoxy having from 1 to about 5 carbon atoms; or halogen; or --NHCOR 2 , --NHSO 2 R 2 , --CONR 2 R 3 or --SO 2 R 2 R 3 where R 2 and R 3 , which can be the same or different, are hydrogen or alkyl having from 1 to about 4 carbon atoms; and n is 0, 1 or 2.

Claim 14

The photographic emulsion of claim 11 wherein R 1 is alkyl or alkoxy of from 1 to about 5 carbon atoms.

Claim 15

The photographic emulsion of claim 11 wherein R is a thienyl or a furyl group.

Claim 16

The photographic emulsion of claim 11 wherein the hydrazide compound has the structural formula: ##STR34##

Claim 17

The photographic emulsion of claim 11 wherein the hydrazide compound has the structural formula: ##STR35##

Claim 18

The photographic emulsion of claim 11 wherein the hydrazide compound has the structural formula: ##STR36##

Claim 19

The photographic emulsion of claim 11 wherein the hydrazide compound has the structural formula: ##STR37##

Claim 20

The photographic emulsion of claim 11 wherein the hydrazide compound has the structural formula: ##STR38##

Claim 21

The photographic emulsion of claim 11 wherein the hydrazide compound has the structural formula: ##STR39##

Claim 22

The photographic emulsion of claim 11 wherein the hydrazide compound has the structural formula: ##STR40##

Claim 23

A process for forming a high contrast photographic image which comprises exposing and developing a photographic recording material comprising a negative-working silver halide emulsion layer and a hydrazide nucleating compound having one of the following structural formulae: ##STR41## wherein; R is alkyl having from about 8 to about 16 carbon atoms or a heterocyclic ring having 5 or 6 ring atoms, including ring atoms of sulfur or oxygen; R 1 is alkyl or alkoxy having from 1 to about 12 carbon atoms; X is alkyl, thioalkyl or alkoxy having from 1 to about 5 carbon atoms; halogen; or --NHCOR 2 , --NHSO 2 R 2 , --CONR 2 R 3 or --SO 2 R 2 R 3 where R 2 and R 3 , which can be the same or different, are hydrogen or alkyl having from 1 to about 4 carbon atoms; and n is 0, 1 or 2 by use of a hydroquinone developing agent.

Claim 24

A process for forming a high contrast photographic image which comprises exposing and developing a photographic recording material comprising a negative-working silver halide emulsion layer and a hydrazide nucleating compound having one of the following structural formulae: ##STR41## wherein; R is alkyl having from about 8 to about 16 carbon atoms or a heterocyclic ring having 5 or 6 ring atoms, including ring atoms of sulfur or oxygen; R 1 is alkyl or alkoxy having from 1 to about 12 carbon atoms; X is alkyl, thioalkyl or alkoxy having from 1 to about 5 carbon atoms; halogen; or --NHCOR 2 , --NHSO 2 R 2 , --CONR 2 R 3 or --SO 2 R 2 R 3 where R 2 and R 3 , which can be the same or different, are hydrogen or alkyl having from 1 to about 4 carbon atoms; and n is 0, 1 or 2 by use of a hydroquinone developing agent.