Thiacyanine betaine blue sensitizing dyes

Claim 2

A photosensitive element comprising a support carrying: (a) a red-sensitive silver halide emulsion having associated therewith a cyan dye developer; (b) a green-sensitive halide emulsion having associated therewith a magenta dye developer; and (c) a blue-sensitive silver halide emulsion having associated therewith a yellow dye developer; said blue-sensitive silver halide emulsion additionally including a 3,3'-disubstituted, 4,5-benzothia-thiacyanine betaine of the formula: ##STR15## wherein R is ethyl or sulfopropyl, R 1 is sulfopropyl when R is ethyl and R 1 is ethyl when R is sulfopropyl and X is hydrogen.

Claim 3

The element of claim 1 wherein the blue-sensitive emulsion contains less than about 2 mole percent iodide.

Claim 4

The element of claim 2 wherein said blue-sensitive emulsion contains about 5/8 mole percent iodide.

Claim 5

A photographic film unit which comprises, in combination: a photosensitive element having a diffusion transfer image-receiving element affixed at least one edge thereof, said photosensitive element comprising a support carrying: (a) a red-sensitive silver halide emulsion having associated therewith a cyan dye developer; (b) a green-sensitive silver halide emulsion having associated therewith a magenta dye developer; (c) a blue-sensitive silver halide emulsion having associated therewith a yellow dye developer; said blue-sensitive silver halide emulsion additionally including a 3,3'-disubstituted, 4,5-benzothia-thiacyanine betaine of the formula: ##STR16##

Claim 6

A photographic film unit which comprises, in combination: a photosensitive element having a diffusion transfer image-receiving element affixed at least one edge thereof, said photosensitive element comprising a support carrying: (a) a red-sensitive silver halide emulsion having associated therewith a cyan dye developer; (b) a green-sensitive silver halide emulsion having associated therewith a magenta dye developer; (c) a blue-sensitive silver halide emulsion having associated therewith a yellow dye developer; said blue-sensitive silver halide emulsion additionally including a 3,3'-disubstituted, 4,5-benzothia-thiacyanine betaine of the formula: ##STR16##

Claim 7

wherein R is ethyl or sulfopropyl, R 1 is sulfopropyl when R is ethyl and R 1 is ethyl when R is sulfopropyl and X is hydrogen; said diffusion transfer image-receiving element comprising a support layer carrying: an alkaline processing composition permeable and dyeable layer wherein said photosensitive and said image-receiving elements are adapted to be superposed, the support layers of each comprising the extremities of the superposed structure.

Claim 8

wherein R is ethyl or sulfopropyl, R 1 is sulfopropyl when R is ethyl and R 1 is ethyl when R is sulfopropyl and X is hydrogen; said diffusion transfer image-receiving element comprising a support layer carrying: an alkaline processing composition permeable and dyeable layer wherein said photosensitive and said image-receiving elements are adapted to be superposed, the support layers of each comprising the extremities of the superposed structure.

Claim 9

The film unit of claim 4 including a rupturable container retaining an aqueous alkaline processing composition affixed to one edge of said photosensitive and said image-receiving elements and adapted to rupture to distribute its contents intermediate said superposed photosensitive and image-receiving elements.

Claim 10

The film unit of claim 5 wherein said image-receiving element support layer is transparent.

Claim 11

The film unit of claim 6 in which said unit is a composite structure comprising said photosensitive element and said image-receiving element permanently affixed to the other in superposed relationship, the support layers of each of said elements being outermost.

Claim 12

The film unit of claim 4 wherein said blue-sensitive emulsion contains less than 2 mole percent iodide.

Claim 13

The film unit of claim 8 wherein said blue-sensitive emulsion contains about 5/8 mole percent iodide.

Claim 14

The film unit of claim 4 wherein (c) consists essentially of said emulsion, said dye developer and said betaine.

Claim 15

A photosensitive element comprising a support carrying a light-sensitive silver halide emulsion optically sensitized with a 3,3'-disubstituted 4,5-benzothiacyanine of the formula: ##STR17## wherein R is ethyl or sulfopropyl, R 1 is sulfopropyl when R is ethyl and R 1 is ethyl when R is sulfopropyl and X is hydrogen.

Claim 16

A photosensitive element comprising a support carrying a light-sensitive silver halide emulsion optically sensitized with a 3,3'-disubstituted 4,5-benzothiacyanine of the formula: ##STR17## wherein R is ethyl or sulfopropyl, R 1 is sulfopropyl when R is ethyl and R 1 is ethyl when R is sulfopropyl and X is hydrogen.

Claim 17

The element of claim 11 wherein said emulsion contains less than about 2 mole percent iodide.

Claim 18

The element of claim 12 wherein said emulsion contains about 5/8 mole percent iodide.

Claim 19

The element of claim 11 which includes a layer containing a yellow dye developer.

Claim 20

A 3,3'-disubstituted, 4,5-benzothia-thiacyanine betaine of the formula: ##STR18## wherein R is ethyl, or sulfopropyl, R 1 is sulfopropyl when R is ethyl and R 1 when R is sulfopropyl, and X is hydrogen.

Claim 21

A 3,3'-disubstituted, 4,5-benzothia-thiacyanine betaine of the formula: ##STR18## wherein R is ethyl, or sulfopropyl, R 1 is sulfopropyl when R is ethyl and R 1 when R is sulfopropyl, and X is hydrogen.