Low concentration sensitization and development acceleration

Claim 2

A PHOTOGRAPHIC ELEMENT COMPRISING A SUPPORT HAVING COATED THEREON AT LEAST ONE LAYER COMPRISING A PHOTOGRAPHIC SILVER HALIDE EMULSION AND IN SAID LAYER OR IN A SECOND LAYER COATED ADJACENT THERETO A RUTHENIUM CATIONIC COMPLEX INCLUDING AT LEAST FOUR LIGANDS CHOSEN FROM THE CLASS CONTAINING OF AMMINE AND AMINE LIGANS, SAID RUTHENIUM CATIONIC COMPLEX BEING PRESENT IN A CONCENTRATION OF AT LEAST 0.1 MG, BUT LESS THAN 1 GRAM PER MOLE OF SILVER.

Claim 3

A photographic element according to claim 1 in which said element contains from 100 to 0.1 mg of said ruthenium complex per mole of silver.

Claim 4

A photographic element according to claim 2 in which said element contains from 50 to 0.5 mg of said ruthenium complex per mole of silver.

Claim 5

A photographic element according to claim 3 in which said element contains from 20 to 1 mg of said ruthenium complex per mole of silver.

Claim 6

A photographic element according to claim 1 in which said silver halide emulsion layer or said second adjacent layer contains an azaindene antifoggant.

Claim 7

A photographic element according to claim 5 in which said azaindene is a tetraazaindene.

Claim 8

A photographic element according to claim 1 in which said element contains an alkylene oxide development restrainer.

Claim 9

A photographic element according to claim 1 in which said ruthenium complex is a hexacoordinated divalent or trivalent cationic complex.

Claim 10

A photographic element according to claim 1 in which said ruthenium complex includes at least five or six ammine or amine ligands.

Claim 11

A photographic element according to claim 9 in which said ammine and amine ligands are chosen from the class consisting of ammine ligands and aliphatic amine ligands containing six or fewer carbon atoms.

Claim 12

A photographic element according to claim 10 in which said amine ligands are chosen from the class consisting of ethylene diamine, trimethylane diamine, diethanol amine and dipropanol amine ligands.

Claim 13

A photographic element according to claim 1 in which said ruthenium complex includes ligands in addition to said ammine or amine ligands chosen from the class consisting of water, halogen and thiocyanate ligands.

Claim 14

A photographic element according to claim 1 in which said amine ligands are chosen from the class consisting of aliphatic amine ligands containing six or fewer carbon atoms.

Claim 15

A photographic element comprising a support having coated thereon a high contrast lithographic silver halide emulsion containing at least 50 mole percent silver chloride and in said emulsion layer or in a layer coated adjacent thereto from 100 to 0.1 mg per mole of silver of a hexacoordinated ruthenium cationic complex inlcuding at least four ligands chosen from the class consisting of ammine ligands and aliphatic amine ligands containing six or fewer carbon atoms, and an azaindene antifoggant.

Claim 16

A photographic element comprising a support having coated thereon a high contrast lithographic silver halide emulsion containing at least 50 mole percent silver chloride and in said emulsion layer or in a layer coated adjacent thereto from 100 to 0.1 mg per mole of silver of a hexacoordinated ruthenium cationic complex inlcuding at least four ligands chosen from the class consisting of ammine ligands and aliphatic amine ligands containing six or fewer carbon atoms, and an azaindene antifoggant.

Claim 17

A photographic element according to claim 14, in which said lithographic sliver chloride emulsion is comprised of silver halide grains in which the halide conisists of at least 50 mole percent chloride, up to about 10 mole percent iodide and any remaining halide being bromide.

Claim 18

A photographic element according to claim 14 in which said ruthenium complex is present in a concentration of from 50 to 0.5 mg per mole of silver.

Claim 19

A photographic element according to claim 16 in which Said ruthenium complex is present in a concentration of from 20 to 1 mg per mole of silver.

Claim 20

A photographic element according to claim 14 in which said silver halide emulsion incorporates a rhodium salt.

Claim 21

A photographic element according to claim 14 in which said silver halide emulsion layer or said second adjacent layer contains a tetrazaindene antifoggant.

Claim 22

A photographic element according to claim 14 in which said silver halide emulsion layer or said second adjacent layer contains a cationic cobalt(III) complex having amine or ammine ligands.

Claim 23

A photographic element comprising a support having coated thereon a high contrast lithographic silver halide emulsion containing at least 50 mole percent silver chloride and in said emulsion or in a layer coated adjacent thereto 100 to 0.1 mg per mole of silver of a hexacoordinated ruthenium cationic complex including at least four ligands chosen from the class consisting of ammine ligands and aliphatic amine ligands containing six or fewer carbon atoms; and 0.2 to 5.0 grams per mole of silver of a hexacoordinated cobalt or chromium(III) cationic complex.

Claim 24

A photographic element comprising a support having coated thereon a high contrast lithographic silver halide emulsion containing at least 50 mole percent silver chloride and in said emulsion or in a layer coated adjacent thereto 100 to 0.1 mg per mole of silver of a hexacoordinated ruthenium cationic complex including at least four ligands chosen from the class consisting of ammine ligands and aliphatic amine ligands containing six or fewer carbon atoms; and 0.2 to 5.0 grams per mole of silver of a hexacoordinated cobalt or chromium(III) cationic complex.

Claim 25

A photographic element according to claim 21 in which said silver halide emulsion or said adjacent layer contains a tetrazaindene.

Claim 26

A photographic element according to claim 22 in which said ruthenium complex and said cobalt(III) complex are both hexammine complexes.

Claim 27

A photographic element comprising a support having coated thereon a high contrast lithographic silver halide emulsion containing at least 50 mole percent silver chloride, up to 10 mole percent silver iodide and any remaining silver halide being a silver bromide and in said emulsion or in a layer adjacent thereto 20 to 1 mg per mole of silver of a hexammine ruthenium cationic complex; 0.3 to 3.0 grams per mole of silver of a hexammine cobalt(III) cationic complex; and 0.3 to 3.0 grams per mole of silver of 5-bromo-4-hydroxy-6-methyl-1,3,3a, 7-tetrazindene.

Claim 28

A photographic element comprising a support having coated thereon a high contrast lithographic silver halide emulsion containing at least 50 mole percent silver chloride, up to 10 mole percent silver iodide and any remaining silver halide being a silver bromide and in said emulsion or in a layer adjacent thereto 20 to 1 mg per mole of silver of a hexammine ruthenium cationic complex; 0.3 to 3.0 grams per mole of silver of a hexammine cobalt(III) cationic complex; and 0.3 to 3.0 grams per mole of silver of 5-bromo-4-hydroxy-6-methyl-1,3,3a, 7-tetrazindene.

Claim 29

A photographic element according to claim 1 in which said photographic silver halide emulsion is a negative-type emulsion.