Abstract:
A light sensitive silver halide color photographic element having a common chromogenic coupler and a distinct developer associated with each color forming layer unit is disclosed. In a first embodiment, the light sensitive silver halide color photographic element has a red light sensitive silver halide layer unit and a first blocked coupling developer, a green light sensitive silver halide layer unit and a second blocked coupling developer and a blue light sensitive silver halide layer unit having a third blocked coupling developer and wherein each layer unit has the same chromogenic coupler. In a second embodiment, the light sensitive silver halide color photographic element has a red light sensitive silver halide layer unit and a first blocked coupling developer, a green light sensitive silver halide layer unit and a second blocked coupling developer, and a blue light sensitive silver halide layer unit having a third blocked coupling developer. By means of the present invention, light sensitive color photothermographic elements can form yellow, magenta and cyan dye records of consistent density forming ability and conistent stability in all three color records. The present invention also relates to a novel blocked phenylenediamine developer useful in the imaging elements according to the present invention.
Abstract:
Blocked photographically useful groups decompose thermally via a Lossen rearrangement reaction, including, for example, compounds represented by the following structure: F. In the above structure, the substituents are as defined in the application. Such compounds have good reactivity and can by used to block photographically useful compounds such as developing agents until thermally activated under preselected conditions. Compounds according to the present invention are especially useful in color photothermographic imaging elements.
Abstract:
Blocked photographically useful groups decompose thermally via a Lossen rearrangement reaction, including, for example, compounds represented by the following structure: F. In the above structure, the substituents are as defined in the application. Such compounds have good reactivity and can by used to block photographically useful compounds such as developing agents until thermally activated under preselected conditions. Compounds according to the present invention are especially useful in color photothermographic imaging elements.
Abstract:
This invention comprises an imaging element comprising an imaging layer having associated therewith a phenolic activating agent in combination with a blocked color-forming agent of Structure (I) wherein PUG is a photographically useful color-forming agent, LINK 1 and LINK 2 are linking groups; TIME is a timing group; HET is a heterocyclic group, and the other groups are as defined in the specification.
Abstract:
This invention comprises an imaging element comprising an imaging layer having associated therewith a phenolic activating agent in combination with a blocked color-forming agent of Structure (I) wherein PUG is a photographically useful color-forming agent, LINK 1 and LINK 2 are linking groups; TIME is a timing group; HET is a heterocyclic group, and the other groups are as defined in the specification.
Abstract:
A novel blocked photographically useful compound element and process are based on a new blocking group that comprises a beta-ketocarbonyl group that is part of a 5- to 7-member heterocyclic ring containing a hetero-atom not adjacent to the beta-ketocarbonyl group. Such a blocked photographically useful compound provides a photographic material and process enabling more rapid release of the photographically useful group upon processing.
Abstract:
A light sensitive silver halide color photographic element having a common chromogenic coupler and a distinct developer associated with each color forming layer unit is disclosed. In a first embodiment, the light sensitive silver halide color photographic element has a red light sensitive silver halide layer unit and a first blocked coupling developer, a green light sensitive silver halide layer unit and a second blocked coupling developer and a blue light sensitive silver halide layer unit having a third blocked coupling developer and wherein each layer unit has the same chromogenic coupler. In a second embodiment, the light sensitive silver halide color photographic element has a red light sensitive silver halide layer unit and a first blocked coupling developer, a green light sensitive silver halide layer unit and a second blocked coupling developer, and a blue light sensitive silver halide layer unit having a third blocked coupling developer. By means of the present invention, light sensitive color photothermographic elements can form yellow, magenta and cyan dye records of consistent density forming ability and conistent stability in all three color records. The present invention also relates to a novel blocked phenylenediamine developer useful in the imaging elements according to the present invention.
Abstract:
Polymers comprising recurring units which, in the presence of silver ion or silver complex, are capable of undergoing cleavage or which, in the presence of an oxidizing or reducing agent, form a reaction product capable of undergoing cleavage so as to release a monovalent radical from the polymer. In a preferred embodiment, the released material comprises a photographically useful moiety. The invention also relates to photographic products and processes employing polymers comprising recurring units which, in the presence of a cleavage-initiating agent provided in an imagewise distribution as a result of development of a silver halide emulsion, undergo cleavage to release a correspondingly imagewise distribution of a photographically useful moiety.
Abstract:
A novel blocked filter dye comprises a new blocking group that (a) comprises two electrophilic groups, the least electrophilic of which is bonded directly or through a timing group to the filter dye group of the compound, (b) is capable of reacting with a dinucleophile reagent, and (c) has the two electrophilic groups separated from each other by a bond or unsubstituted or substituted atom that enables nucleophilic displacement to occur with release of the filter dye when the compound is reacted with a dinucleophile reagent. Such a blocked filter dye is useful in a photographic material and process to provide increased stability and enable more rapid release of the filter dye upon reaction with a dinucleophile reagent.
Abstract:
Photographic system wherein development of an exposed photosensitive element with an aqueous alkaline photographic developing composition is effected in the presence of a compound represented by formula (I), wherein R is -OH, -OR4, -NH2-NHR5 or -NR4R6; R1 is hydrogen, -NH2, alkyl, substituted alkyl, aryl or substituted aryl; R2 and R3 each independently is hydrogen, alkyl, aralkyl or aryl; R4 is a protecting group which can be removed in the presence of a base; R5 is an activating group which can render the neighboring hydrogen atom acidic; R6 is an electron withdrawing group which is capable of stabilizing the negative charge on the nitrogen atom which is produced upon removal of R4 upon contact with alkali; and PHOTO is a photographically useful group. The compounds provide controlled release of the photographically useful group by a base-catalyzed elimination when contacted by the aqueous alkaline processing composition.