摘要:
The invention relates to an ultrahigh contrast photographic material comprising a support bearing a silver halide emulsion layer, containing a hydrazide nucleating agent in the emulsion layer or a hydrophilic colloid layer, characterized in that the nucleating agent is a dimeric molecule comprising two monomers linked by a linking group, each monomer of which (a) may be the same or different and (b) comprises an acylhydrazide moiety and a nicotinamide moiety in combination, the material providing unexpectedly good nucleation in the absence of, or with reduced amounts of, booster and in a developer whose pH is variable, and further with lower chemical spread and pepper fog.
摘要:
The invention relates to an ultrahigh contrast photographic material comprising a support bearing a silver halide emulsion layer, containing a hydrazide nucleating agent in the emulsion layer or a hydrophilic colloid layer, characterised in that the nucleating agent is a dimeric molecule comprising two monomers linked by a linking group, each monomer of which (a) may be the same or different and (b) comprises an acylhydrazide moiety and a nicotinamide moiety in combination, the material providing unexpectedly good nucleation in the absence of, or with reduced amounts of, booster and in a developer whose pH is variable, and further with lower chemical spread and pepper fog.
摘要:
The invention relates to an ultrahigh contrast photographic material comprising a support bearing a silver halide emulsion layer, containing a hydrazide nucleating agent in the emulsion layer or a hydrophilic colloid layer, characterised in that the nucleating agent of formula (I) comprises (a) two nicotinamide moieties, which may be the same or different, which are linked by a linking group, and (b) a hydrazide moiety linked to only one of the nicotinamide moieties. The nucleator of formula (I) may be in combination with a nucleator of formula (II) which comprises a dimeric molecule comprising two monomers linked by a linking group, each monomer of which (a) may be the same or different and (b) comprises a hydrazide moiety and a nicotinamide moiety. The photographic material provides unexpectedly good nucleation in the absence of, or with reduced amounts of, booster and in a developer whose pH is variable, and further with lower chemical spread and pepper fog. When the synthesis provides both a compound of formula (I) and (II), the products can be used directly without a separation step, providing a cost advantage.
摘要:
The present invention relates to a silver halide photographic element comprising a dye-forming coupler of formula (I) ##STR1## wherein R.sup.1 is selected from an alkyl group, an aryl group, a 5-10 membered heterocyclic group containing one or more O, N or S atoms, each of which groups is unsubstituted or substituted, or a substituted amino group;R.sup.2 is an unsubstituted alkyl group having a secondary or tertiary carbon atom attached to the oxygen atom;X is hydrogen or a coupling-off group; andR.sup.3 is a substituent and n is 0 to 4; orwherein R.sup.2, as defined above, and an R.sup.3 substituent may together with the O atom form a 5-10 membered heterocyclic group which may contain one or more further heteroatoms selected from O, N and S, said group being unsubstituted or substituted; andwherein at least one of R.sup.1, R.sup.2 and R.sup.3 separately or in combination constitutes a ballast group,the couplers providing enhanced light stability together with acceptable dye hue in images produced from photographic materials containing them.
摘要:
A photographic silver halide material comprises an organophosphorus dye stabilizer represented by the formula: ##STR1## wherein A represents the atoms necessary to complete a substituted or unsubstituted heterocyclic ring;R.sub.1 represents substituted or unsubstituted alkyl, substituted or unsubstituted cycloalkyl, substituted or unsubstituted alkenyl, substituted or unsubstituted aryl, or a heterocyclic group;Y is an oxygen or a sulfur atom; and,n is 0 or 1.Such a photographic silver halide material enables improved stability of dye images in the material.
摘要:
Color photographic elements, especially color photographic papers, can be more rapidly color developed (up to 25 seconds) in the presence of a color developing solution containing a selectively diffusible color development photochemical such as a development inhibitor. Despite the shortened processing time, color balance within the three color records of such elements is maintained. The selectively diffusible color development photochemical has size and structure that enables it to have sufficient solubility in the color developing composition, and to selectively diffuse into the topmost red-sensitive emulsion layers of the processed color papers only.
摘要:
A photographic element comprising a support having thereon at least one silver halide emulsion layer having associated therewith a yellow or cyan dye-forming coupler and a dye stabilizer comprising a phosphate ester compound having the formula: ##STR1## wherein each Ar independently represents a substituted or unsubstituted arcyl group, andX is a linking group.
摘要:
Pigments for inkjet inks are controllably functionalised to improve water-dispersibility, ozone resistance, etc., by irradiation of the pigment particle with high energy radiation, such as gamma radiation in air or by plasma activation, to form a stable functionalisable intermediate pigment particle, then activating the stable functionalisable intermediate, e.g. by heating, in the presence of a functionalising precursor (e.g. a polymer or polymerisable monomer) to form a modified pigment particle having one or more functionalising group grafted onto the pigment particle.
摘要:
The present invention provides a photographic element comprising a support bearing a light-sensitive silver halide emulsion layer in association with an image dye-forming coupler and having associated therewith a compound of general formula wherein R1 is an unsubstituted or substituted alkyl group, aryl group or 5-10 membered heterocyclic ring group containing one or more heteroatoms selected from N, O and S; each R2 is independently selected from hydrogen, halogen, and substituted or unsubstituted alkyl, aryl, alkyl- or aryl-sulfamoyl, alkyl- or aryl-sulfonamido, alkyl- or aryl-carbamoyl, alkyl- or aryl-carbonamido, alkenyloxy or 5-10 membered heterocyclic ring group containing one or more heteroatoms selected from N, O and S; each Y is independently selected from the groups consisting of —NHSO2 and —SO2NH; wherein the hydrogen therein has a pKa value of less than 9; n is an integer from 1 to 20; x is an integer from 1 to 6 and wherein the compound is ballasted. The addenda of formula (I) can significantly increase the image dye yield and improve robustness to process pH variation, without adverse effects on coupler or dye stability, dye hue and/or speed, in a simple, cost effective way.
摘要:
Photographic materials having incorporated sulphonyhdrazide color developing agents. Such photographic materials have at least two color-forming units, each of which has a silver halide emulsion layer and a photographic coupler. A ballasted heterocyclic sulphonhydrazide color developing agent is present in the material in droplets of a high boiling point solvent. A method of forming a photographic color image using such materials is also provided.