Silver halide emulsions spectrally sensitized to infrared radiation with novel cyanine dyes

Claim 2

A light-sensitive photographic silver halide emulsion spectrally sensitized to infrared radiation above about 800 nm with a sensitizing dye having the formula ##STR16## wherein R 1 is alkyl having 2 to 4 carbon atoms or --(CH 2 ) m R' wherein R' is carboxy or sulfo and m is 2, 3 or 4; R 2 is --(CH 2 ) n R" wherein R" is carboxy or sulfo and n is 2, 3 or 4; Z + is a counter ion; and p is 1 or 2 provided p is 1 when R 1 is alkyl and p is 2 when R 1 is --(CH 2 ) m R'.

Claim 3

A photosensitive element comprising a support carrying a silver halide emulsion, said silver halide emulsion being spectrally sensitized to infrared radiation above about 800 nm with a sensitizing dye having the formula ##STR17## wherein R 1 is alkyl having 2 to 4 carbon atoms or --(CH 2 ) m R' wherein R' is carboxy or sulfo and m is 2, 3 or 4; R 2 is --(CH 2 ) n R" wherein R" is carboxy or sulfo and n 2, 3 or 4; Z + is a counter ion; and p is 1 or 2 provided p is 1 when R 1 is alkyl and p is 2 when R 1 is --(CH 2 ) m R'.

Claim 4

A photosensitive element comprising a support carrying a silver halide emulsion, said silver halide emulsion being spectrally sensitized to infrared radiation above about 800 nm with a sensitizing dye having the formula ##STR17## wherein R 1 is alkyl having 2 to 4 carbon atoms or --(CH 2 ) m R' wherein R' is carboxy or sulfo and m is 2, 3 or 4; R 2 is --(CH 2 ) n R" wherein R" is carboxy or sulfo and n 2, 3 or 4; Z + is a counter ion; and p is 1 or 2 provided p is 1 when R 1 is alkyl and p is 2 when R 1 is --(CH 2 ) m R'.

Claim 5

A photosensitive element as defined in claim 2 wherein R 1 is alkyl and p is 1.

Claim 6

A photosensitive element as defined in claim 2 wherein R" is sulfo.

Claim 7

A photosensitive element as defined in claim 2 wherein R 1 is ethyl and n is 3.

Claim 8

A photosensitive element as defined in claim 2 wherein R 1 is --(CH 2 ) m R', R' is carboxy or sulfo, m is 2, 3 or 4 and p is 2.

Claim 9

A photosensitive element as defined in claim 2 wherein R' and R" are sulfo.

Claim 10

A photosensitive element as defined in claim 2 wherein R 1 is --(CH 2 ) m R' and R 2 is --(CH 2 ) n R" m and n are equal, and R' and R" are the same; m and n are 2, 3 or 4; and R' and R" are carboxy or sulfo; p is 2.

Claim 11

photosensitive element as defined in claim 8 wherein R' and R" are sulfo, and m and n are 3.

Claim 12

A photosensitive element as defined in claim 9 wherein 2 + is triethylammonium.

Claim 13

A photosensitive element as defined in claim 2 including a layer containing an image dye-providing material positioned between said support and said silver halide emulsion.

Claim 14

A photographic product comprising a photosensitive element as defined in claim 2; a second, sheet-like element in superposed or superposable position with respect to said silver halide emulsion; a rupturable container releasably holding a processing composition and positioned to release said composition for distribution between said elements; said photosensitive element or said second, sheet-like element containing an image-receiving layer for receiving by diffusion transfer an imagewise distribution of diffusible image-forming material formed in said photosensitive element following distribution of said processing composition.

Claim 15

A photographic product as defined in claim 12 wherein said diffusible image-forming material forms a transfer image in silver.

Claim 16

A photographic product as defined in claim 12 wherein said diffusible image-forming material forms a transfer image in dye.

Claim 17

A photographic product as defined in claim 12 wherein said photosensitive element comprises, in sequence on said support, a layer of a cyan image dye-providing material, a silver halide emulsion spectrally sensitized to infrared radiation with said sensitizing dye, a layer of a magenta image dye-providing material, a layer of a red-sensitive silver halide emulsion, a layer of a yellow image dye-providing material, and a layer of a blue sensitive silver halide emulsion.

Claim 18

A sensitizing dye of the formula ##STR18## wherein R 1 is alkyl having 2 to 4 carbon atoms or --(CH 2 ) m R' wherein R' is carboxy or sulfo and m is 2, 3 or 4; R 2 is --(CH 2 ) n R" wherein R" is carboxy or sulfo and n is 2, 3 or 4; Z + is a counter ion; and p is 1 or 2 provided p is 1 when R 1 is alkyl and p is 2 when R 1 is --(CH 2 ) m R'.

Claim 19

A sensitizing dye of the formula ##STR18## wherein R 1 is alkyl having 2 to 4 carbon atoms or --(CH 2 ) m R' wherein R' is carboxy or sulfo and m is 2, 3 or 4; R 2 is --(CH 2 ) n R" wherein R" is carboxy or sulfo and n is 2, 3 or 4; Z + is a counter ion; and p is 1 or 2 provided p is 1 when R 1 is alkyl and p is 2 when R 1 is --(CH 2 ) m R'.

Claim 20

A sensitizing dye as defined in claim 16 wherein R 1 is alkyl and p is 1.

Claim 21

A sensitizing dye as defined in claim 16 wherein R" is sulfo.

Claim 22

A sensitizing dye as defined in claim 16 wherein R 1 is ethyl and n is 3.

Claim 23

A sensitizing dye as defined in claim 16 wherein R 1 is --(CH 2 ) m R', R' is carboxy or sulfo, m is 2, 3 or 4 and p is 2.

Claim 24

A sensitizing dye as defined in claim 16 wherein R' and R" are sulfo.

Claim 25

A sensitizing dye as defined in claim 16 wherein R 1 is --(CH 2 ) m R' and R 4 is --(CH 2 ) n R" provided m and n are equal, and R' and R" are the same; m and n are 2, 3 or 4; and R' and R" are carboxy or sulfo; p is 2.

Claim 26

A sensitizing dye as defined in claim 22 wherein R' and R" are sulfo, and; m and n are 3.

Claim 27

A sensitizing dye as defined in claim 23 wherein Z 30 is triethylammonium.