Classifications

• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
  • G03C1/00—Photosensitive materials
  • G03C1/76—Photosensitive materials characterised by the base or auxiliary layers
  • G03C1/95—Photosensitive materials characterised by the base or auxiliary layers rendered opaque or writable, e.g. with inert particulate additives
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
  • G03C1/00—Photosensitive materials
  • G03C1/005—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein
  • G03C1/035—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein characterised by the crystal form or composition, e.g. mixed grain
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
  • G03C1/00—Photosensitive materials
  • G03C1/005—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein
  • G03C1/035—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein characterised by the crystal form or composition, e.g. mixed grain
  • G03C2001/03564—Mixed grains or mixture of emulsions

Definitions

• This invention relates to a light-sensitive silver halide photographic material. More particularly, it relates to a light-sensitive silver halide photographic material having superior inscribability and erasability. Still more particularly, it is concerned with a light-sensitive silver halide photographic material that can be effectively used as a photographing matt film for use in the photocopying of drawings, maps, etc. From another point of view, it is further concerned with a light-sensitive silver halide photographic material for direct positives, and more particularly to a light-sensitive silver halide photographic material for direct positives that has inscribability, a high speed, and an improved whiteness.
• matt films are used in the photocopying of drawings. for machines and constructions, maps, etc.; the macro-photographying or montage-photographying of aerial photographs dot- formed with use of a screen; and so forth.
• Matt films are meant by films made opaque by adding matting agents in a large quantity in a film. The reasons why the films are matted by adding matting agents in a large quantity are such that matting makes it possible to inscribe something, or make correction thereof, in pencil or ink after exposure and processing, and makes it possible to erase with erasers something inscribed in pencil or ink, and thus it becomes possible to make correction of drawings or writing-in. Accordingly, the matt films are used for the purpose of making correction or writing-in something by inscribing or erasing something as mentioned above after exposure and processing, or used for the purpose of making diazo-printing, taking copies, or the like purposes.
• the photographying matt films are used in usual cameras, and usual rapid-access processing is employed for development. Then, what are desired for the photographying of aerial photographs are those approximate to a continuous tone, and, for the photographying, those having a good sharpness.
• hitherto available matt films have had the problems that they have so a soft tone that the line photographying can not be made, or so a high contrast that the continuous tone can not be obtained or the clearing is inferior.
• inks used for inscribing are mostly water-based inks, and, in many instances, operators manually make writing-in with use of a needle pen (Rotring pen: trade name of Rotring-Werke Riepe KG) or the like generally used in the field of drafting.
• a needle pen Rotring pen: trade name of Rotring-Werke Riepe KG
• smoothness in writing touch and not preferred are rugged feeling and overly strong writing resistance as operators may suffer increasing fatigue.
• the matt films are handled under red illumination in many instances, and therefore the matt films are usually color-sensitized so as to have color sensitivities to the blue region and green region.
• sensitizing dyes used for sensitization to the green region are all sorts of cyanine dyes and merocyanine dyes, and those capable of applying sensitivities to blue light and green light may include, for example, cyanine dyes and merocyanine dyes described in Japanese Patent Publications No. 7828/1963, No. 392/1965, No. 10251/1968 and No. 22884/1968, British Patents No. 815,172, No. 955,961, No. 955,912 and No. 142,228, U.S.
• Patents No. 1,942;854, No. 1,950,876, No. 1,957,869, No. 2,238,231, No. 2,521,705 and No. 2,647,059 Japanese Patent Publications No. 2606/1968, No. 3644/1969, No. 18106/1971, No. 18101/1971, No. 15032/1973, No. 33782/1974, No. 34252/1979 and No. 52574/1983, U.S. Patents No. 2,839,403, No. 3,567,458 and No. 3,625,698, etc.
• the higher sensitizing ability the dyes have the more strongly color remains after development processing, and thus the dyes that can satisfy both the high speed and the color remain are very limitedly available.
• a first object of this invention is to provide a light-sensitive silver halide photographic material that can produce a continuous tone and make the line photographying on the same film and show very good clearing from fixing, even when the usual rapid-access processing is carried out.
• a second object of this invention is to provide a light-sensitive silver halide photographic material having very good inscribability and erasability.
• a third object of this invention is to provide a light-sensitive silver halide photographic material for direct positives that has inscribability, a high speed, and an improved whiteness.
• a first invention that can achieve the first and second objects is a tight-sensitive silver halide photographic material comprising a support, at least one silver halide emulsion layer provided on at least one side of said support, and a protective layer provided on said silver halide emulsion layer, wherein said silver halide emulsion layer is formed of two kinds of emulsions each having different average grain size of the grains contained therein, the average grain size in said emulsion containing grains of a smaller average grain size comprises from 40 to 70 % of the average grain size in said emulsion containing grains of a larger average grain size, and said silver halide emulsion layer has a silver amount of 4.5 g/m 2 or less, and further at least one layer of said silver halide emulsion layer and said protective layer contains 300 mg/m 2 or more of at least one kind of matting agent.
• a second invention that can achieve the second object is a light-sensitive silver halide photographic material comprising a support and provided by coating thereon at least one hydrophilic colloid layer containing a matting agent, wherein the center-line average roughness of said light-sensitive material ranges from 0.15 to 0.8 u.m, and the weight percentage of a matting agent having a particle diameter more than 6 u.m is 5 % or less based on the whole matting agent.
• a third invention that can achieve the third object is a light-sensitive silver halide photographic material for direct positives, comprising a support and provided thereon a direct positive silver halide emulsion layer containing silver halide grains applied with fog in the presence of a reduction fogging agent and a water-soluble gold compound, wherein at least 250 mg/m 2 of at least one kind of matting agent is contained and at least one of any compounds represented by Formulas (I), (II), (III), (IV) and (V) shown below is contained, in a photographic layer of the side on which said direct positive silver halide emulsion layer is provided; wherein, in Formulas (I), (II), (III), (IV) and (V), R 1 , R 21 and Ra 1 each represent a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, an aryloxy group or a nitro group; R 2 , Ra, R 4 , R 22 , R 2 a, R 24 , R 32
• Described first is the emulsion layer in the first invention.
• emulsions comprising two kinds of emulsions. These may preferably be monodisperse emulsions.
• the monodisperse emulsions herein referred to are meant by emulsions in which the grain size of the grains comprising 90 % of the whole in the number of silver halide grains has a distribution within ⁇ 40 % of average grain size.
• Each average grain size of the two kinds of emulsions may preferably range from 0.2 to 0.6 u.m, more preferably from 0.3 to 0.5 ⁇ m, in respect of larger grains (which is meant by grains in the emulsion containing grains having a larger average grain size; the same applies hereinafter), and may preferably range from 0.1 to 0.4 u.m, more preferably from 0.15 to 0.35 u.m, in respect of smaller grains (which is meant by grains in the emulsion containing grains having a smaller average grain size; the same applies hereinafter).
• the average grain size of the smaller grains ranges from 40 to 70 % based on the average grain size of the larger grains. This may be arbitrarily selected if it is in the range of from 40 to 70 %, and this range may vary depending on the purpose of use. The range otherwise more than 70 % may result in a high contrast to obtain no gradation, and the same otherwise less than 40 % may result in discontinuous gradation to be of no practical use.
• the above two kinds of emulsions used in this invention may be coated to form respectively independent layers, but may preferably be coated to form a layer using an emulsion in which the two kinds of emulsions having different grain size are mixed.
• the two kinds of emulsions may preferably be mixed in the ratio such that the mixing ratio of the emulsion using the silver halide grains of smaller grain size ranges from 30 to 70 %, and particularly preferable results are obtained when it ranges from 40 to 60 %.
• the amount of silver applied in the light-sensitive silver halide photographic material of this invention comprising the two kinds of emulsions should be 4.5 g/m 2 or less. Though variable depending on the purpose, the amount otherwise more than 4.5 g/m 2 may result in danger of undesirably causing poor fixing in the rapid development processing having been practiced in the present industrial field.
• the silver halide emulsion layer used for constituting the emulsion layer can be prepared by use of the methods described in P. Glafkides, "Chimie et Physique Photographique”, published by Paul Montel Co., 1967; G.F. Duffin, “Photographic Emulsion Chemistry”, published by The Focal Press Co., 1966; V.L. Zelikman et al, “Making and Coating Photographic Emulsion”, published by The Focal Press Co., 1964.
• any methods such as an acidic method, a neutral method and an ammoniacal method, and, as a form of reacting soluble silver salts with soluble halogen salts, any of a one-side synthesizing method, a simultaneous mixing method, a combination of these, etc.
• the light-sensitive silver halide photographic material of this invention comprises a minimum constituent unit comprising one silver halide emulsion layer provided on one side of support.
• a light-sensitive layer typified by the silver halide emulsion layer may be provided in plural layers on at least one side of the support. In the instance of the plural layers, it is usual to provide an intermediate layer between the layers. There may be further provided a subbing layer, a backing layer, an intermediate layer, an anti-halation layer, a protective layer, etc.
• the light-sensitive silver halide photographic material of this invention contains at least 300 mg,/m 2 of at least one kind of matting agent in at least one layer of the silver halide emulsion layer and protective layer.
• the content of the matting agent otherwise less than 300 mg/m 2 may make it difficult to achieve sufficient inscribability. It may also contain a same kind or different kind of matting agent, and in such an instance the layer to which the matting agent is added may be any of emulsion layers and protective layers, or subbing layers, intermediate layers and so forth that are optionally provided.
• the matting agent may be of any kinds, and various kinds of agents can be appropriately used. Specifically, it is possible to use finely divided particles of water-insoluble organic or inorganic compounds having any particle diameter.
• Preferably used are those having a particle diameter of from 0.3 u.m to 5 u.m.
• the organic compound are water-dispersible vinyl polymers as exemplified by polymethyl acrylate, polymethyl methacrylate, polyacrylonitrile, an acrylonitrile/a-methylstyrene copolymer, polystyrene, a styrene/divinylbenzene copolymer, polyvinyl acetate, polyethylene carbonate, polytetrafluoroethylene, etc.; cellulose derivatives as exemplified by methyl cellulose, ethyl cellulose, cellulose acetate, cellulose acetate propionate, etc.; starch derivatives as exemplified by carboxy starch, carboxynitrophenyl starch, a urea-formaldehyde-starch reaction product, etc.; gelatin cured with various curing agents and cured gelatin formed into microcapsule hollow particles by coacervation
• the inorganic compound examples include silicon dioxide, titanium dioxide, magnesium dioxide, aluminum dioxide, barium sulfate, calcium carbonate, silver chloride desensitized by various methods, silver bromide similarly desensitized, glass, diatomaceous earth, etc., which can be preferably used.
• the above matting agent can be used by optionally mixing with it materials of different kind.
• the light-sensitive silver halide photographic material of this invention may preferably be processed with use of a fixing agent containing no hardening agent.
• a step for the fixing is meant by a step of effecting fixing by desilvering using a fixing solution containing a silver halide fixing agent.
• the silver halide fixing agent used in the fixing solution includes compounds capable of forming water-soluble complex salts by reacting with silver halides as those used in usual fixing, as typically exemplified by thiosulfates such as potassium thiosulfate, sodium thiosulfate and ammonium thiosulfate, thiocyanates such as potassium thiocyante, sodium thiocyanate and ammonium thiocyanate, thioureas, thioethers, etc. These fixing agents are used generally in an amount of 5 g/lit.
• the fixing solution may contain solely or in combination, a variety of buffering agents such as boric acid, borax, sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, sodium bicarbonate, potassium bicarbonate, acetic acid, sodium acetate and ammonium hydroxide. It may further contain all sorts of brightening agents and anti-foaming agents or surface active agents.
• buffering agents such as boric acid, borax, sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, sodium bicarbonate, potassium bicarbonate, acetic acid, sodium acetate and ammonium hydroxide. It may further contain all sorts of brightening agents and anti-foaming agents or surface active agents.
• preservatives such as hydroxylamine, hydrazine and bisulfite addition products of aldehyde compounds, organic chelating agents such as aminopolycarboxylic acids, stabilizers such as nitroalcohol and nitrates, organic solvents such as methanol, dimethylsulfonamide and dimethylsulfoxide, etc.
• the fixing solution is used generally with pH of 3.0 or more, but may desirably be used with pH 4.0 or more and 9.5 or less. It is used with a processing temperature desirably of 55°C or less while suppressing evaporation or the like.
• binders or protective colloids in photographic emulsions for constituting the protective layers and emulsion layers used in the light-sensitive silver halide photographic material of this invention, as well as hydrophilic colloids in the backing layer optionally provided, is gelatin.
• hydrophilic colloids other than it.
• gelatin Used as this gelatin may be lime-treated gelatin, as well as oxygen-treated gelatin as described in Bulletin of Society of Science of Photography of Japan (Bull. Soc. Sci. Phot. Japn) No. 16, page 30 (1966), and hydrolysates or enzymolysates of gelatin can be also used.
• gelatin derivatives are those obtained by reacting gelatin with various compounds as exemplified by acid halides, acid anhydrides, isocyanates, bromoacetic acid, alkanesultones, vinylsulfonamides, maleinimide compounds, polyalkylene oxides, epoxy compounds, etc..
• the silver halide photographic emulsion used in this invention and the backing layer optionally provided may contain various compounds for the purpose of preventing fogging during preparation process, storage or photographic processing of light-sensitive materials, or achieving stabilized photographic performances. More specifically, there can be added a variety of compounds known as antifoggants or stabilizers including azoles as exemplified by benzothiazolium salts, nitroindazoles, triazoles, benzotriazoles and benzimidazoles (particularly nitro-or halogen-substituted compounds); heterocyclic mercapto compounds as exemplified by mercaptothiazoles, mercaptobenzothiazoles, mercaptobenzimidazoles, mercaptothiadiazoles, mercaptotetrazoles (particularly 1-phenyl-5-mercaptotetrazole) and mercaptopyrimidines; the above heterocyclic mercapto compounds having a water-soluble group such as a carboxyl group and
• the silver halide emulsion used in this invention and the backing layer optionally provided may further contain all sorts of chemical sensitizers, torning agents, hardening agents, surface active agents, thickening agents, plasticizers, lubricants, development restrainers, ultraviolet absorbents, irradiation-preventive agent dyes, heavy metals, matting agents, etc. which are incorporated according to various methods.
• the silver halide emulsion used in this invention and the backing layer optionally provided may also contain polymer latex.
• polymer latex used as the polymer latex are aqueous dispersions of homo-or copolymers as exemplified by methyl acrylate, methyl methacrylate.. acrylic acid, methacrylic acid, glycidyl acrylate, styrene, vinyl chloride, vinylidene chloride, etc.
• transparent supports can be used, and materials for the usable supports may include, for example, cellulose acetate, cellulose nitrate, polyesters such as polyethylene terephthalate, polyolefin such as polyethylene and polystyrene, glass, etc. These supports are optionally subjected to subbing processing.
• the light-sensitive silver halide photographic material of this invention can be color-sensitized with use of a variety of sensitizing dyes.
• the silver halide emulsion layer of this invention can be processed for development according to various methods, for example, usually used methods.
• solutions for black and white development are alkaline solutions containing developing agents such as hydroxybenzenes, aminophenols and aminobenzenes, and may contain other sulfites, carbonates, bisulfites, bromides and iodides of alkali metal salts.
• the matting agent used in the second invention there can be used finely divided particles of known water-insoluble organic or inorganic compounds, which are same as those in the first invention.
• the matting agent used in this invention can be added in any hydrophilic colloid layers. Specifically, they include silver halide emulsion layers, surface-protective layers, intermediate layers, subbing layers, backing layers, etc., preferably silver halide emulsion layer and protective layer provided upper than the silver halide emulsion layer.
• the kind, shape, size, amount for addition of the matting agent used can be freely selected, but it is required to control the center-line average roughness (Ra) of the side on which the hydrophilic colloid layers containing the matting agent are provided, so as to be in the range of from 0.15 to 0.8 u.m.
• the Ra otherwise less than 0.15 u.m may result in a poor inscribability, and Ra otherwise more than 0.8 u.m may result in a poorness in smoothness of writing touch.
• the center-line average roughness referred to in this invention is in accordance with the method described in the Japan Industrial Standard JIS B-0601 (corresponds to ISO/R 468).
• matting agents containing no matting agent particles having a particularly large particle diameter desired as the matting agent used in this invention are matting agents containing no matting agent particles having a particularly large particle diameter, and the weight percentage of a matting agent having a particle diameter more than 6 u.m is required to be 5 % or less based on the whole matting agent.
• the above weight percentage otherwise more than 5 % may result in loss of smoothness of writing touch and also make it liable to give irregularities in the density of lines inscribed, also resulting in a'poorness in the line-width constancy.
• the above weight percentage may more preferably be 2 % or less, still more preferably 1 % or less.
• centrifugal separation type powder classifiers can be used.
• the surface tension of a coating solution for the hydrophilic colloid layer positioned at an uppermost layer is preferably to be modified in the range of from 28 to 38 dyne/cm.
• the surface tension otherwise lower than 28 dyne/cm may cause the problems that the lines inscribed in water-base ink have a low density and come to have non-uniformity in the density.
• the surface tension otherwise more than 38 dyne/cm may bring about the problems that the lines inscribed in water-base ink have a greater line width and also stronger blots are left when erased. More preferably, the surface tension may desirably be in the range of from 30 to 36 dyne/cm.
• the surface tension referred to in this invention is meant by static surface tension and distinguished from dynamic surface tension.
• the surface tension can be measured by use of the method described, for example, in JIKKEN KAGAKU KOZA (Experimental Chemistry Course) Vol. 7, edited by NIPPON KAGAKUKAI (Japan Chemical Society).
• the surface tension can be modified by selecting the kind and amount of surface active agents to be added in the coating solution.
• known surface active agents can be used alone or in combination of two or more kinds, and can be used, for example, nonionic surface active agents such as saponin (steroid type), alkylene oxide derivatives (as exemplified by polyethylene glycol, a polyethylene glycol/polypropylene glycol condensate, polyethylene glycol alkyl ethers or polyethylene glycol alkylaryl ethers, polyethylene glycolesters, polyethylene glycol sorbitan esters, polyethylene glycol alkylamines or amides, and polyethylene oxide addition products of silicone), glycidol derivatives (as exemplified by alkenylsuccinic acid polyglyceride and alkylphenol polyglyceride), fatty acid esters of polyhydric alcohols, and alkyl esters of sugars; anionic surface active agents containing an acidic group such as a carboxylic group,
• Examples of these surface active agents include those described in U.S. Patents No. 2,240,472, No. 2,831,766, No. 3,158.484, No. 3,210,191, No. 3,294,540 and No. 3,507,660, British Patents No. 1,012,495, No. 1,022,878, No. 1,179,290 and No. 1,198,450, Japanese Unexamined Patent Publication No. 117414/1975, U.S. Patents No. 2,739,891, No. 2,823,123, No. 3,065,101, No. 3,415,649, No. 3,666,475 and No. 3,756,828, British Patent No. 1,397,218, U.S. Patents No. 3,133,816, No. 3,441,413, No.
• German Published Patents No. 19 50 121 and No. 19 61 638 Japanese Unexamined Patent Publication No. 7781/1971, British Patents No.1,330,356 and No. 1,524,631, U.S. Patents No. 3,666,478 and No. 3,589,906, Japanese Patent Publication No. 26687/1977, Japanese Unexamined Patent Publications No. 46733/1974 and No. 32322/1976, etc.
• the hydrophilic colloid constituting the light-sensitive material of this invention include not only gelatin (either lime-treated or acid-treated one may be used) as described for the first invention, but also gelatin derivatives as exemplified by gelatin derivatives prepared by reacting gelatin with aromatic sulfonyl chloride, acid chloride, acid anhydride, isocyanate or 1,4-diketones as described in U.S. Patent No. 2,614,928, gelatin derivatives prepared by reacting gelatin with trimeritic acid anhydride as described in U.S. Patent No. 3,118,766, gelatin derivatives prepared by reacting gelatin with an organic acid having an active halogen as described in Japanese Patent Publication No.
• gelatin derivatives prepared by reacting gelatin with an aromatic glycidyl ether as described in Japanese Patent Publication No. 26845/1967 gelatin derivatives prepared by reacting gelatin with maleimide, maleamic acid, unsaturated aliphatic diamide or the like as described in U.S. Patent No. 3,186,846, sulfoalkylated gelatin as described in British Patent No. 1,033,189, polyoxyalkylene derivatives of gelatin for example, U.S. Patent No.
• polymeric grafted products of gelatin as exemplified by those obtained by grafting on gelatin any of acrylic acid, methacrylic acid, a monohydric or polyhydric alcohol ester of these, similarly amide, acrylo-or methacrylonitrile, styrene, and other vinyl monomers, which are used alone or in combination; synthetic hydrophilic polymeric substances as exemplified by homopolymers comprised of a monomer such as vinyl alcohol, N-vinylpyrrolidone, hydroxyalkyl acrylate or methacrylate, acryl-or methacrylamide and N-substituted acryl-or methacrylamide, or copolymers comprised of any mutual combination of these, copolymers of any of these with acrylate or methacrylate, vinyl acetate, styrene or the like, copolymers of any of the above with maleic anhydride, maleamino acid or the like, etc.; naturally occurring hydrophil
• the emulsion layers and other component layers may contain plasticizers as exemplified by glycerol, diols as described in U.S. Patent No. 2,960,404, trihydric aliphatic alcohols as described in U.S. Patent No. 3,520,694.
• the emulsion layers and other component layers may contain dispersions of water-insoluble or slightly soluble synthetic polymers for the purpose of increasing the dimension stability or the like purposes.
• water-insoluble or slightly soluble synthetic polymers for example, there can be used alkyl acrylate or methacrylate, alkoxy acrylate or methacrylate, glycidyl acrylate or methacrylate, acryl-or methacrylamide, vinyl acetate, acrylonitrile, olefin, styrene, etc.
• the emulsion layers and other component layers can be hardened by adding hardening agents usually used.
• the hardening agents include, for example, aldehydes as exemplified by glyoxal described in U.S. Patent No. 1,870,354, glutaraldehyde described in British Patent No. 825,544; N-methylol compounds as exemplified by N,N' -dimethylol urea, dimethylolhydantoin described in British Patent No. 676,628; dioxane derivatives as exemplified by dihydroxydioxane described in U.S. Patent No. 3,380,829 or similar derivatives described in Japanese Patent Publication No.
• the hydrophilic colloid layer containing the matting agent may preferably be hardened with use of active halogen type hardening agents.
• active halogen type hardening agents it is also possible to use in combination any hardening agents other than the active halogen type hardening agents. Employment of the active halogen type hardening agents makes it possible to decrease the blots at the time of the erasing of water-base ink inscriptions to comtribute enhancement of removability, without damaging the inscribability.
• the active halogen type hardening agent, the manner of use thereof, etc. are described, for example, in Japanese Patent Publications No. 16928/1964, No. 2602/1968, No. 6151/1972, No. 33380/1972, No.
• Preferred active halogen hardening agents are dichloro-S-triazines, and may typically include, for example, 2,4-dichloro-6-hydroxy-1,3,5-triazine (alkali metal salts), 2,4-dichloro-6-methoxy-1,3,5-triazine, 2,4-dichloro-6-ethylamino-1,3,5-triazine, 2,4-dichloro-6-hydroxyethylamino-1,3,5-triazine, etc.
• alkali metal salts 2,4-dichloro-6-methoxy-1,3,5-triazine
• 2,4-dichloro-6-ethylamino-1,3,5-triazine 2,4-dichloro-6-hydroxyethylamino-1,3,5-triazine, etc.
• Such hardening accelerators may include non-protonic solvents described in West German Patent (Laid-Open Publication) No. 24 17 586, betaine type surface active agents described in Japanese Unexamined Patent Publication No. 62045/1982, tertiary amines or salts thereof (as exemplified by those described in Japanese Unexamined Patent Publications No. 1043/1981 and No. 9434/1976, West German Patent (Laid-Open Publication) No. 21 38 305, British Patents No. 1,284,305 and No. 1,269,983, etc.), all sorts of inorganic salts or polyhydric alcohols, etc.
• any of silver halides can be used, including silver bromide, silver iodobromide, silver iodochloride, silver chlorobromide, silver chloroiodobromide, silver chloride, etc. which are used in usual silver halide emulsions.
• the support used in the light-sensitive material of this invention may preferably be transparent. This is because the light-sensitive material of this invention is often used as an original for diazo print copying after development processing.
• the support may include cellulose acetate, cellulose nitrate, polystyrene, polyvinyl chloride, polyethylene terephthalate, polycarbonate, polyamide, etc.
• This development processing may be either the processing to form silver images (black and white development processing) or the development processing to form color images, depending on the purpose.
• the black and white development processing comprises a developing step, a fixing step and a washing step.
• the washing step may sometimes be omitted when a stopping step is carried out after the developing step or a stabilizing step is applied after the fixing step.
• Developing agents or precursors thereof may be incorporated into light-sensitive materials to carry out the developing step with use of an alkali solution only. There may be also carried out a developing step using lith developers as developing solutions.
• At least one of the compounds represented by Formulas (I), (II), (III), (IV) and (V) is contained, and these are advantageously used as organic desensitizers. These compounds are superior in that they can bring about a high speed and a low color remain.
• at least one kind arbitrarily selected from the group consisting of the compounds represented by Formulas (I), (II), (III), (IV) and (V) may be contained, and there may be available either i) one, two or more kinds of the compound represented by any one of the formulas or ii) two or more kinds of the compounds represented by two or more formulas. When two or more kinds of the compounds are used, they may be in any combination.
• Synthesis methods for the organic desensitizer of this invention include, for example, the methods described in U.S. Patents No. 3,567,456, No. 3,582,343, No. 3,598,596, etc. in respect of the compounds represented by Formulas (I), (II) and (III), the methods described in U.S. Patents No. 3,539,349, etc. in respect of the compound represented by Formula (IV), and the methods described in U.S. Patents No. 3,431,111, No. 3,492,123, etc. in respect of Formula (V).
• organic desensitizers may desirably be dissolved in suitable solvents and added in the silver halide having been desalted, in an amount of 10- 4 to 10- 2 mol per mole of silver halide.
• suitable solvents may be used alone or as a mixture of two or more kinds.
• the photographic layer referred to in this invention is a generic term for light-sensitive layers and non-light-sensitive layers.
• the light-sensitive layers specifically include direct positive silver halide emulsion layers, direct positive silver halide emulsion layers applied with fog in the presence of a reduction fogging agent and a water-soluble gold compound, and the like layers.
• the non-light-sensitive layers specifically include subbing layers, intermediate layers, protective layers, etc.
• At least 250 mg/m 2 of at least one kind of matting agent is contained in at least one layer of the photographic layers.
• the content of the matting agent otherwise less than 250 mg/m 2 may make it difficult to achieve sufficient inscribability.
• a matting agent of the same kind or different kind may be also contained in two or more layers.
• the layer to which the matting agents are added may be any of emulsion layers, protective layers, or subbing layers to be optionally provided, and intermediate layers.
• the matting agents may be of any kind, and various ones can be used, for example. Specifically, they include particles of water-insoluble organic and inorganic compounds, and there can be used those having any particle diameter. Preferably, those having a particle diameter of from 0.3 to 5 u.m should be used. Examples of the organic and inorganic compounds are the same as those set forth in the first invention.
• the reduction fogging agent used in this invention to apply fog includes, for example, formalin, hydrazine, polyamines (as exemplified by triethylenetetramine, tetraethylenepentamine, etc.), thiourea dioxide, tetrahydroxymethylphosphonium chloride, amine borane, boron compound hydrides, stannous chloride, etc. which should be used generally in the range of from 10- 7 to 10- 3 mol per mol of silver halide.
• These reduction fogging agents may also be used alone or as a mixture of two or more kinds.
• the water-soluble gold compound also includes, for example, potassium chloroaurate, chloroaurate, potassium gold cyanide, potassium gold thiocyanate, sodium gold thiomaleate, gold thioglucose, etc., which may be used generally in the range of from 10- 6 to 10-4. mol per mol of silver halide.
• the silver halide emulsions used in this invention may be those having any grain size, crystal habit, silver halide composition, etc., but useful as light-sensitive materials are those having a grain size of approximately from about 0.1 to about 1 u.m as being preferable in view of the graininess and sharpness, and, in silver iodobromide, those comprising preferably not more than 5 mol %, more preferably not more than 3 mol %, of silver iodide as having smaller development restraining properties and being advantageous in practical use.
• These silver halide emulsions are prepared according to a variety of methods. For example, there can be applied the method in which the group VIII soluble gold complex salts as described in U.S. Patent No.
• additives for other photography can be also used.
• stabilizers as exemplified by triazoles, azaindenes, quaternary benzothiazolium compounds, mercapto compounds, or water-soluble inorganic salts of cadmium, cobalt, nickel, manganese, gold, thallium, zinc, etc.
• hardening agents as exemplified by formaldehydes such as formalin, glycoxal and mucochloric acid, s-triazines, epoxys, aziridines, vinylsulfonic acid, etc; coating aids as exemplified by saponin, sodium polyalkylenesul- fonate, lauryl or oleyl monoether of polyethylene glycol, amylated alkyltaurines, fluorine-containing compounds, etc.; and sentizers as exemplified by polyalkylene oxide and derivatives thereof. It is also possible for it to further contain couplers. Besides, there can also be optionally contained antiseptic agents, antistatic agents, developing agents, etc.
• formaldehydes such as formalin, glycoxal and mucochloric acid, s-triazines, epoxys, aziridines, vinylsulfonic acid, etc
• coating aids as exemplified by saponin, sodium polyalkylenesul- fonate,
• the support used in this invention includes supports made of paper, glass, cellulose acetate, cellulose nitrate, polyester, polyamide, polystyrene, polypropylene, etc., or laminated materials comprising two or more kinds of substrates, as exemplified by a laminated material comprising paper and a polyolefin (as exemplified by polyethylene, polypropylene, etc.).
• Developing agents include hydroquinone, alklylhydroquinones (as exemplified by methylhydroquinone, dimethylhydroquinone and t-butylhydroquinone), catechol, pyrazole, chlorohydroquinone, dichlorohydroquinone, methoxyhydroquinone, ethoxyhydroquinone, aminophenol developing agents (as exemplified by N-methyl-p-aminophenol and 2,4-diaminophenol), ascorbic acid developing agents, N-methyl-p-aminophenolsulfate, pyrazolones (as exemplified by 4-aminopyrazolone), 3-pyrazolidone developing agents (as exemplified by 1-phenyl-3-pyrazolidone, 1-phenyl-4,4-dimethyl-3-pyrazolidone, 1-phenyl-5-methyl-3-pyrazolidone,
• the developing solution of this invention may optionally contain all sorts of additives including preservatives such as sulfites, bisulfites and hydroxylamines; alkali agents such as hydroxides, carbonates and phosphates; pH adjusters such as acetic acid; dissolution aids such as polyethylene glycols; sensitizers such as quaternary ammonium salts; organic solvents such as methanol, diethylene glycol, diethanolamine, dimethylformamide and dimethylsulfoxide; development accelerators; surface active agents; anti-foaming agents; toning agents; viscosity-imparting agents such as carboxymethyl cellulose and hydroxyethyl cellulose; hardening agents such as glutaraldehyde; silver sludge preventive agents; silver halide solvents such as thioethers, thioamides, thiocyanates and thiosulfates; antifoggants such as potassium bromide and benzotriazole; chelating agents such
• fixing solutions used in this invention those having the composition generally used can be used.
• fixing agents including sodium thiosulfate, ammonium thiosulfate, sodium thiocyanate and ammonium thiocyanate, silver halide solvents including thioureas and amine derivatives, as well as sulfites such as sodium sulfite, ammonium sulfite, sodium bisulfite and potassium metabisulfite; borates such as borax and sodium metaborate; organic carboxylic acids such as acetic acid, citric acid, tartaric acid and malic acid; inorganic acids such as sulfuric acid, boric acid and hydrochloric acid; amines such as ethylenediamine, diethanolamine and triethanolamine; water-soluble aluminum salts such as potash alum, ammonium alum, aluminum sulfate and aluminum chloride; organic compounds such as methanol, ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol
• the silver halide grains contained.in the emulsion layers may preferably comprise silver chloride or silver chloroiodide containing 10 to 80 mol % of silver chloride, and be subjected to spectral sensitization by use of a compound represented by Formula (VI).
• Z represents a group of atoms necessary for completing an oxazole nucleus, a benzoxazole nucleus or a naphtoxazole nucleus, and these nuclei may have a substituent on a carbon atom.
• substituent may include halogen atoms (as exemplified by a fluorine atom, a chlorine atom and a bromine atom), unsubstituted alkyl groups having 1 to 6 carbon atoms (as exemplified by a methyl group, an ethyl group, a propyl group, a butyl group, a hexyl group, etc.), alkoxy groups having 1 to 4 carbon atoms (as exemplified by a methoxy group, an ethoxy group, a propoxy group and a butoxy group), a hydroxyl group, alkoxycarbonyl groups having 1 to 6 carbon atoms (as exemplified by a methoxycarbonyl group, an ethoxycarbonyl group, etc.), alkylcarbonyloxy groups having 2 to 5 carbon atoms (as exemplified by an acetyloxy group, a propionyloxy group, etc.
• nuclei examples may include nuclei of, as the oxazole nucleus, oxazole, 4-methyloxazole, 5-methyloxazole, 4,5-dimethyloxazole, 4-phenyloxazole, etc.; as the benzoxazole nucleus, benzoxazole, 5-chlorobenzoxazole, 5-bromobenzoxazole, 5-methylbenzoxazole, 5-ethylbenzoxazole, 5-methoxybenzoxazole, 5-hydroxybenzoxazole, 5-ethoxycarbonylbenzoxazole, 5-acetyloxybenzoxazole, 5-phenylbenzoxazole, 6-methylbenzoxazole, 6-methoxybenzoxazole, 5,6-dimethylbenzoxazole, 6-chloro-5-methylbenzoxazole, etc.; as the naphthoxazole nucleus, naphtho[1,2-d]oxazole, naphtho[2,1-
• R' represents a substituted or unsubstituted alkyl group.
• the substituent may include a hydroxyl group, a sulfo group, a sulfonate group, a carboxyl group, halogen atoms (as exemplified by a fluorine atom and a chlorine atom), substituted or unsubstituted alkoxy groups having 1 to 4 carbon atoms (the alkoxy group may be further substituted with a sulfo group or a hydroxyl group), alkoxycarbonyl groups having 2 to 5 carbon atoms, alkylsulfonyl groups having 1 to 4 carbon atoms, a sulfamoyl group, substituted or unsubstituted carbamoyl groups (including substituted carbamoyl groups substituted with an alkyl group having 1 to 4 carbon atoms), substituted phenyl groups (examples of the substituent are a sulfo group, a
• Examples of the unsubstituted alkyl group may include a methyl group, an ethyl group, a propyl group and a butyl group.
• Examples of the substituted alkyl group may include as hydroxyalkyl groups, a 2-hydroxyethyl group, a 3-hydroxypropyl group, etc., as sulfoalkyl groups, a 2-sulfoethyl group, a 3-sulfopropyl group, a 3-sulfobutyl group, a 4-sulfobutyl group, a 2-hydroxy-3-sulfopropyl group, a 2-chloro-3-sulfopropyl group, etc., as carboxyalkyl groups, a carboxymethyl group, a carboxyethyl group, a carboxypropyl group, etc., a 2,2,2-trifluoroethyl group, a 2-(3-sulfopropyloxy)ethyl group,
• R 2 represents an alkoxycarbonylalkyl group, a hydroxyalkyl group, a hydroxyalkoxyalkyl group, a carbamoylalkyl group, a hydroxyalkylthioalkyl group, a hydroxyphenyl group, a morpholinoalkyl group, a hydroxyalkylphenyl group, a phenyl group, an alkoxyalkyl group, or a substituent
• A represents a nitrile group, an alkylsulfonyl group, a sulfonamide group, an alkylsulfonylamino group or an alkoxy group having 1 to 8 carbon atoms, and n represents an integer of 1 to 4.
• R 2 include those having a substituent.
• those wherein the alkyl moiety in the above groups has been substituted with a halogen atom can also be preferably used.
• R 2 examples include alkoxycarbonylalkyl groups (as exemplified by a methoxycarbonylfluoromethyl group, an ethoxycarbonylfluormethyl group, a fluoroethoxycarbonylethyl group, etc.), hydroxyalkyl groups (as exemplified by a 2-hydroxyfluoroethyl group, 2-hydroxyfluoropropyl group, 3-hydroxyfluoropropyl group, 2,3-dihydroxyfluoropropyl group, etc.), hydroxyalkoxyalkyl groups (as exemplified by a hydroxymethox- yfluoromethyl group, a 2-(2-hydroxyfluoroethoxy)ethyl group, a hydroxyfluoroethoxymethyl group, etc.), carbamoylalkyl groups (including N-alkyl-substituted, N,N-dialkyl-substituted, N-hydroxyalkyl-substituted,
• R 3 and R 4 may be the same or different, and each represent a hydrogen atom, an alkyl group (preferably one having 1 to 4 carbon atoms, as exemplified by a methyl group, an ethyl group, etc.), an alkoxy group (preferably one having 1 to 4 carbon atoms, as exemplified by a methoxy group, an ethoxy group, etc.), an alkylsulfonyl group, a sulfo group, a chlorine atom, a fluorine atom or a carboxyl group.
• an alkyl group preferably one having 1 to 4 carbon atoms, as exemplified by a methyl group, an ethyl group, etc.
• an alkoxy group preferably one having 1 to 4 carbon atoms, as exemplified by a methoxy group, an ethoxy group, etc.
• an alkylsulfonyl group preferably one having 1 to 4 carbon atoms,
• R 1 represents a straight or branched alkyl group having 1 to 4 carbon atoms and substituted with a sulfo group or a carboxyl group and/or a hydroxyl group, specifically including a sulfoethyl group, a sulfopropyl group, a 3-sulfobutyl group, a 4-sulfobutyl group, a carboxymethyl group, a carboxyethyl group, a hydroxyethyl group, a 3-sulfo-2-hydroxypropyl group, etc.
• the compound represented by the above Formula (VI) used in this invention can be synthesized by the method of synthesizing dimethinemerocyanines as described in Japanese Patent Publications No. 549/1971, No. 18105/1971, No. 18106/1971, No. 18108/1971, No. 4085/1972 and No. 52574/1983, U.S. Patents No. 2,839,403, No. 3,384,486, No. 3,625,698, No. 3,480,439 and No. 3,567,458, etc.
• Addition and dispersion of the merocyanine dye represented by the above Formula (VI) used in this invention in the silver halide emulsion can be carried out, for example, by conventionally known methods.
• the methods may include a method in which it is added by dispersing it together with a surface active agent as described in Japanese Patent Publication No. 44895/1974 and Japanese Unexamined Patent Publication No. 11419/1975, a method in which it is added as a dispersion with a hydrophilic substrate as described in Japanese Unexamined Patent Publications No. 16624/1978, No. 102732/1978 and No. 102733/1978, U.S. Patents No. 3,469,987 and No.
• the merocyanine dye may be dissolved in a water-soluble solvent as exemplified by a solvent solely comprising water, ethanol, methanol, acetone, propanol, alcohol fluoride, pyridine, or the like or a mixed solvent of any of these, and then added in emulsions. It may be added at any time in the course of preparing emulsions, but may preferably be added during chemical ripening or after chemical ripening.
• the dye of the above Formula (VI) used in this invention may be added in the amount for carrying out the spectral sensitization of silver halide emulsions, as exemplified by 10- 5 to 2 ⁇ 10 -2 , preferably 10- 4 to 2 x 10- 3 mol per mol of silver halide.
• the merocyanine dye used in this invention can be subjected to supersensitization, for example, by using it in any amount in combination with other dyes as described in Japanese Patent Publications No. 4933/1968, No. 4936/1968, No. 18107/1971, No. 1999/1971, No. 11114/1972, No. 1762/1973, No. 38408/1973, No. 38937/1981 and No. 52574/1983, U.S. Patents No. 2,519,001 and No. 3,745,014, etc.
• the silver halide grains contained in the silver halide emulsion layer of this embodiment are required to be comprised of silver chlorobromide or silver chloroiodobromide containing 10 to 80 mol % of silver chloride. This is because the silver chloride otherwise less than 10 mol % may result in a lowering of speed and the silver chloride otherwise more than 80 mol % may cause an increase in fog.
• the content of silver iodide may preferably be 5 mol % or less, more preferably 2 mol % or less, for the purpose of achieving a higher speed.
• a compound containing a metal belonging to Group VIII can be made to coexist for improving developability, making hardened, giving high illumination adaptability, etc.
• Solution A Water 9.7 lit Sodium chloride 20 g Gelatin 105 g
• Solution B Water 3.8lit Gelatin 94 g
• Solution C water 3.8 lit Silver nitate 1,700 g
• the silver amount and the type of the matting agent and coating amount thereof in the emulsion layer of each sample were as shown in Table 3, and the type of the matting agent and coating amount thereof in the protective layer were as shown in Table 3.
• the whole amount of the above developing solution was dissolved in 3 lit. of pure water (ion-exchanged water) and used.
• the developing solution had the pH of about 11.4 before dilution with water, and the developing solution had the pH of about 10.8 after dilution with water.
• the above composition was dissolved in 500 ml of water, made up to 1 lit. and used.
• This fixing solution had the pH of about 4.5.
• the sharpness in line photographying was visually evaluated with use of a 100-power magnifier, and evaluateded by a 5 rank system, indicating that 5 is the best.
• the gamma represents the gradation in a continuous tone, which is a gamma value of the film density of from 0.1 to 2.5, showing that 2 to 2.6 is good for the characteristics of the present films. The larger the value is, the higher the contrast is, so that it becomes impossible to use the films as continuous tone films.
• Samples No. 6 to No. 8 falling under the comparative sample show poorness in the sharpness of line photographying, and Samples No. 9 and No. 10 have so a high contrast that it is impossible to use them as continuous tone films.
• Samples No. 13 and No. 15 show a poorness in the inscribability and erasability with use of the pencil and the needle pen (Rotring pen), and Samples Nos. 1, 6 and 17, a serious poorness in the clearing in fixing.
• Emulsion I 0.1 g of 4-hydroxy-6-methyl-1,3,3a,7-tetrazaindene and 6 mg of sodium thiosulfate were added to Emulsion I to apply sulfur sensitization with ripening for 60 minutes at 50°C, followed by addition of 70 mg of 1-phenyl-5-mercaptotetrazole, 1 g of 4-hydroxy-6-methyf-1.3,3a,7-tetrazaindene and 40 g of gelatin.
• Emulsion II 1.5 mg was added to Emulsion II to apply sulfur sensitization with ripening for 80 minutes at 50°C, followed by addition of 70 mg of 1-phenyl-5-mercaptotetrazole, 1 g of 4-hydroxy-6-methyl-1,3,3a,7-tetrazaindene and 40 g of gelatin.
• Emulsion I and Emulsion II were mixed. Thereafter 200 mg of Compound (a) shown below and 60 mg of Compound (b), per mol of silver halide, were added to effect spectral sensitization, and further added were 3.7 g of saponin as a coating aid, 2 g of hydroquinone as a stabilizer, rice starch, as a matting agent, having the particle diameter characteristics as shown in Table 5 and in the amount as shown in Table 5, 30 g of polybutyl acrylate as a latex polymer, 1 g of a styrene/maleic anhydride copolymer as a thickening agent and 0.8 g of sodium 2,4-dichloro-6-hydroxy-s-triazine as a hardening agent, followed by adjustment of the pH to 5.5 with use of citric acid as a final step to prepare a coating solution for emulsion layers.
• saponin as a coating aid
• 2 g of hydroquinone as a stabilizer
• the classification of rice starch and silica was carried out with use of Spedic Classifier manufactured by Seishin Kigyo, and the average particle diameter and the weight percentage of the matting agent having a particle diameter exceeding 6 u.m to the whole matting agent were measured by Laser Micronsizer manufactured by Seishin Kigyo.
• Coated silver amount was 3.5 g/m 2
• gelatin amounts were 2.5 g/m 2 for the lower backing layer, 1 g,/m 2 for the upper backing layer, 1.9 g/m 2 for the emulsion layer, and 1.4 g.lm 2 for the protective layer.
• Processing conditions were 40°C, 20 seconds for developing, 35°C, 20 seconds for fixing, and room temperature and 20 seconds for washing.
• the evaluation was made with use of a 10-power magnifier to visually evaluate the density of lines, the uniformity of density and the constancy of line width, and the line width reproducibility was measured with use of a 25-power magnifier having gradations of length.
• Target line width is 500 u.m. Smoothness in writing touch was evaluated at the same time.
• Lines were erased with a plastic eraser for use in pencils, applied with water in a small quantity, to further visually evaluate the degree of blotting.
• Samples No. 22 and No. 24 to No. 28 demonstrates that Samples No. 22 and No. 24 to No. 26 in which the weight percentage of the matting agent having a particle diameter exceeding 6 um to the whole matting agent is 5 % or less have superior inscribability.
• Samples No. 22 and No. 30 to 32 in which the surface tension of the protective layers is in the range of from 28 to 38 dyne/cm have superior inscribability and erasability.
• the developing solution had the pH of about 10.8.
• ⁇ Fixing solution recipe Ammonium thiosulfate (an aqueous 72.5 % WN solution) 240 ml Sodium sulfite 17 g Sodium acetate trihydrate 6.5 g Boric acid 6 g Sodium citrate dihydrate 2 g Acetic acid (an aqueous 90 % WN solution) 25 ml
• the above composition was dissolved in 500 ml of water, made up to 1 lit. and used.
• This fixing solution had the pH of about 4.5.
• This invention has made it possible to provide a light-sensitive silver halide photographic material having superior inscribability and erasability.
• the above emulsion coating solution and protective layer coating solution were coated with lamination on polyethylene-coated paper of 150 u.m thick having a subbing layer to prepare samples.
• Coated silver amount was 1.4 g/m 2
• gelatin coating amounts were 2.0 g/m 2 for the emulsion layer and 1.5 g/m 2 for the protective layer.
• the coating samples were exposed to light through a wedge, and thereafter development processing was carried out using Sakura Automatic Processor GR-26 (manufactured by Konishiroku Photo Industry Co., Ltd.) as an automatic processing machine and solutions having the following recipes as a developing solution and a fixing solution, and the photographic performances were evaluated.
• the development processing conditions were 38°C, 20 seconds for developing, 35°C, 20 seconds for fixing, room temperature and 20 seconds for washing, and about 45°C for drying.
• the developing solution had the pH of about 11.4 before dilution with water, and the developing solution had the pH of about 10.8 after dilution with water.
• composition A Ammonium thiosulfate (an aqueous 72.5 % WN solution) 240 ml Sodium sulfite 17 g Sodium acetate trihydrate 6.5 g Boric acid 6 g Sodium citrate dihydrate 2 g Acetic acid (an aqueous 90 % W/V solution) 13.6 ml
• the above Composition A was dissolved in 500 ml of water, made up to 1 lit. and used.
• This fixing solution had the pH of about 4.9.
• the speed is a relative value of a reciprocal of the exposure amount necessary for giving the density of 0.5.
• the reflection density of non-image areas of the processed samples was measured under a halogen lamp light source with use of a Type 607 color analyzer manufactured by Hitachi, Ltd., to indicate it as the absorbence at max of the remaining organic desensitizer.
• the pencil inscribability was evaluated by examining with a 10-power magnifier the thickness and density of the lines produced when inscribed with use of a pencil having a hardness of 2H.
• the ink inscribability was evaluated by examining with a 10-power magnifier the thickness and density of the lines produced when inscribed with use of a drafting needle pen (Rotring pen) having an inner diameter of 0.5 mm.
• Samples No. 44 to 47 all have a high speed as the relative speed is as high as 100 to 120 and have less color remain as the color remain intensity is zero, but have so a poor inscribability that they can not be put into practical use.
• Samples No. 48 to No. 51 all have a high speed as the relative speed is as high as 80 to 100 and have less color remain as the color remain intensity is 0.01 to 0.02, but have also so a poor inscribability that they can not be put into practical use.
• Example 3 was repeated except that the temperature was set to 55°C, to prepare a silver iodobromide solution.
• rice starch having an average particle diameter of 4.0 um as a matting agent and by the amount as shown in Table 7, 20 mg/m 2 of sodium 1-decyl-2-(3-isopentyl)succinate-2-sulfonate as a . coating aid, 0.8 mg/m 2 of polyethyl acrylate as a polymer latex and 16 mg of formalin as a hardening agent per 1 g of gelatin, to prepare a coating solution for direct positive silver halide emulsions.
• the above emulsion coating solution and protective layer coating solution were coated with lamination on polyethylene terephthalate films of 100 u.m thick having a subbing layer to prepare samples.
• Coated silver amount was 3.5 g/m 2
• gelatin coating amounts were 2.0 g/m 2 for the emulsion layer and 1.5 g/m 2 for the protective layer.
• a back coat layer containing 3.6 g/m 2 of gelatin containing 1.0 g/m 2 of rice starch and 400 mg/m 2 of amorphous silica having an average particle diameter of 3.5 u.m.
• Example 3 Evaluation was made in the same manner as in Example 3. In measuring the color remain intensity, measurement was made by applying to the back surfaces of the processed samples the polyethylene-coated paper of 150 ⁇ m thick used in Example 3.
• Samples No. 64 to No. 69 all have a high speed as the relative speed is as high as 100 to 120 and have less color remain as the color remain intensity is 0 to 0.01, but have so a poor inscribability that they can not be put into practical use.
• Samples No. 70 to No. 75 have a poorness in speed except for Samples No. 73 to 75 showing a speed as high as 120, have much color remain as the color density is 0.02 and 0.03 in respect of Samples No. 70 and No. 73, though having less color remain in respect of Samples Nos. 71, 72, 74 and 75 as the density is 0.01, and have so a poor inscribability in respect of all of Samples Nos. 70 to 75 that they can not be put into practical use.
• this invention can obtain a direct positive light-sensitive silver halide photographic material having superior inscribability and high whiteness.

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