Photograph system
AssigneePolaroid Corporation
InventorsDonna J. Guarrera, Neil C. Mattucci, Avinash C. Mehta, Lloyd D. Taylor, John C. Warner
Life of this patent
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Abstract
There is described a photographic system wherein development of an exposed photosensitive element is carried out in the presence of a quaternary pyridinium compound which has a fused 5 - to 12 - member saturated carbocyclic ring attached to the 2 and 3 positions of the pyridine ring.
Claims18
A photographic method comprising the steps of exposing a photosensitive element which contains at least one silver halide emulsion layer in association with an image dye-providing material and developing said exposed photosensitive element with an aqueous alkaline processing composition in the presence of a quaternary pyridinium compound represented by the formula ##STR17## wherein:
- X represents the carbon atoms necessary to complete a 5 - to 12 - member saturated carbocyclic ring;
- R is hydrogen, alkyl having from 1 to 4 carbon atoms or alkoxy having from 1 to 4 carbon atoms;
- R.sub.1 is alkyl having from 1 to 6 carbon atoms, alkoxyalkyl having from 2 to 8 carbon atoms represented by ##STR18## wherein:
- R.sub.2 is hydrogen or alkyl having from 1 to 3 carbon atoms, R.sub.3 is alkyl having from 1 to 4 carbon atoms, and m is an integer from 1 to 4, aryl or alkaryl represented by ##STR19## where n is an integer from 0 to 3;
- or ##STR20## wherein:
- Y represents the carbon atoms necessary to complete a 5 - or 6 - member heterocyclic moiety, and p is an integer from 1 to 3;
- and
- Z is a photographically acceptable counterion, whereby an image is formed.
A diffusion transfer photographic film unit comprising
- (a.) a photosensitive element comprising a support carrying at least one silver halide emulsion layer;
- (b.) a second sheet-like element which is superposed or superposable on said photosensitive element;
- (c.) an image-receiving layer positioned in one of said photosensitive or second sheet-like elements;
- (d.) a rupturable container releasably holding an aqueous alkaline processing composition and so positioned as to be adapted to distribute said aqueous alkaline processing composition between predetermined layers of said elements;
- and
- (e.) a quaternary pyridinium compound represented by the formula ##STR24## wherein:
- X represents the carbon atoms necessary to complete a 5 - to 12 - member saturated carbocyclic ring;
- R is hydrogen, alkyl having from 1 to 4 carbon atoms or alkoxy having from 1 to 4 carbon atoms;
- R.sub.1 is alkyl having from 1 to 6 carbon atoms, alkoxyalkyl having from 2 to 8 carbon atoms represented by ##STR25## wherein:
- R.sub.2 is hydrogen or alkyl having from 1 to 3 carbon atoms, R.sub.3 is alkyl having from 1 to 4 carbon atoms, and m is an integer from 1 to 4, aryl or alkaryl represented by ##STR26## where n is an integer from 0 to 3;
- or ##STR27## wherein:
- Y represents the carbon atoms necessary to complete a 5 - or 6 - member heterocyclic moiety, and p is an integer from 1 to 3;
- and
- Z is a photographically acceptable counterion.
Dependencies are inferred from the claim text.