US3734733A - Positive working photo-thermographic materials containing bi-imidazolyl compounds and reducing agents and the use thereof in color development - Google Patents

Positive working photo-thermographic materials containing bi-imidazolyl compounds and reducing agents and the use thereof in color development Download PDF

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US3734733A
US3734733A US00132612A US3734733DA US3734733A US 3734733 A US3734733 A US 3734733A US 00132612 A US00132612 A US 00132612A US 3734733D A US3734733D A US 3734733DA US 3734733 A US3734733 A US 3734733A
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compound
group
image
phenyl
reducing
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A Poot
Besauw J Van
T Ghys
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Agfa Gevaert NV
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    • 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
    • G03C5/00—Photographic processes or agents therefor; Regeneration of such processing agents
    • G03C5/56—Processes using photosensitive compositions covered by the groups G03C1/64 - G03C1/72 or agents therefor
    • 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
    • G03C1/72—Photosensitive compositions not covered by the groups G03C1/005 - G03C1/705
    • G03C1/73—Photosensitive compositions not covered by the groups G03C1/005 - G03C1/705 containing organic compounds

Definitions

  • a recording element carrying a photo-oxidizing biimidazolyl compound in chemically reactive contact with a compound having reducing properties is imagewise exposed to activating radiation to effect reaction between the bi-imidazolyl compound in .the exposed areas of the element and the reducing compound to destroy the reducing properties of the latter in such exposed areas and thereafter the exposed element is uniformly contacted with an image-forming compound which is reactive on heating with said reducing compound to produce a distinctive coloration and heated so as to produce by such reaction a visible image corresponding to the unexposed areas of the recording element.
  • the present invention relates to a photothermographic reproduction system and to materials used therefor.
  • thermographic process a heat-sensitive copy sheet is used, which when heated beyond a certain temperature, turns black or dark coloured.
  • the original that contains infrared light-absorbing image areas is exposed to infrared radiation while being in heat-conductive contact with the copy sheet.
  • the copy sheet reaches a temperature at which a coloured product is formed. So, in this process heat is accumulated image-wise in the original and transferred therefrom to the copy sheet.
  • the copy paper will remain heat-sensitive and the image-containing copy paper will be blackened completely by overall heating. This characteristic and the fact that this process is limited to the copying of originals containing infrared radiation-absorbing image markings on an infrared radiation-reflecting background, make that process less attractive.
  • an intermediate U.V. light-sensitive sheet is used for the information-wise exposure.
  • the intermediate sheet includes a volatilizable reductor that becomes transformed with the Patented May 22, 1973 aid of exposed photoreducible dye into a form that is unreactive for a reducible substance contained in a receptor sheet.
  • the present invention provides a novel photographic composition containing a photosensitive substance that by exposure to activating electromagnetic radiation destroys the reducing character of particular reducing compounds.
  • Said photosensitive substance being a photo-oxidant is suited for being applied in a recording process, wherein in a first step information-wise modulated electromagnetic radiation is used to transform a transferable reducing agent into an unreactive species for a reducible substance, that is capable of yielding in a reaction with said reducing agent a product differing in colour from the reactants, and in a second step overall applied heat is used to transfer unmodified transferable reducing agent to a receptor layer or sheet containing said reducible substance.
  • the photosensitive compound used according to the present invention corresponds to the following general formula:
  • each of R R and R stands for a carbocyclic or heterocyclic group with aromatic character and each dotted line circle stands for 4 delocalized electrons.
  • the R R and R groups having an aromatic character are e.g. a phenyl, biphenyl, naphthyl, furyl or thienyl group including said groups in substituted form.
  • the substituents on said groups are restricted to substituents having no Zerewitinoff hydrogen atoms, in other words do not contain hydrogen atoms that are reactive with respect to methylmagnesium iodide.
  • Preferred bi-imidazolyl compounds correspond to the following general formula:
  • R represents a substituent not containing an active hydrogen atom and R R and R represent hydrogen or substituents free from active hydrogen atoms and where two of R R R and R in adjacent positionson the phenyl ring taken together may form a benzo ring, preferably the substituent or substituents ortho to the 4 imidazolyl radical having a sigma constant below 0.7;
  • R R Rm R9 and B and D are phenyl groups which are unsubstituted or substituted with up to three substituents free from R R active hydrogen atoms, two of which, in adjacent positions 1 8 on the phenyl ring, may together form a benzo ring; 5 preferably at least one of the ortho positions in each of I J the phenyl groups B and D is unsubstituted.
  • the groups B and D can be alike or different as will be shown more fully below.
  • a discussion and explanation C of the sigma value is given by H. H. Jaffe in Chem. Rev. 1 53, 191 (1953
  • the substituents which are free from active hydrogen H atoms include alkyl, alkoxy, alkoxy-carbonyl, alkylthio, dialkylamino, dialkylcarbamoyl, dialkylsulphamoyl, alka- R R J noyloxy, N-alkylalkanamido, aryl, aryloxy, arylthio, 3 benzo, halo, and cyano groups.
  • the alkyl substituents wherein R to R are alkyl groups, e.g. lower alkyl groups and the alkyl groups of the alkoxy substituents can be of 1 to 6 carbon atoms; alkoxy groups, e.g.
  • alkoxy groups of any chain length are preferably lower alkyls such containing 1 to 6 carbon atoms; chlorine, bromine or as methyl, ethyl, propyl, butyl, isobutyl, sec.-butyl, tert.- fluorine atoms; or substituents on adjacent carbon atoms butyl, pentyl, isopentyl.
  • the alkanoyl and alkanamido in the phenyl ring together forming a benzo ring, e.g. an substituents preferably contain from 1 to 6 carbon atoms, unsubstituted ring; with the proviso that at least one of i.e.
  • the aryl groups D is unsubstituted.
  • the dotted line circle stands'for 4 include phenyl, l-naphthyl, Z-naphthyl and the halo subdelocalized electrons. stituents include bromine, chlorine and fluorine.
  • Representatives of the bi-imidazolyl compounds suited Particularly preferred compounds for use according to for being used according to the present invention are listed this invention are represented by the formula: hereinafter in Table I.
  • 53 do m-Phenylthio m-Phenylthio.
  • 54 o-Dimethylaminophenyl o-Dimethylaminophenyl. o-Dimethylaminophenyl.
  • 55 do p-Dipentylaminophenyl p-Dipentylarninophenyl.
  • 56 d0 o-Dipropylsulfamylphenyl. o-Dipropylsulfamylphenyl.
  • 57 o-Dunethylcarbamylphenyl o-DimethylearbamylphenyL- o-Dimethylcarbamylphenyl.
  • o-Methoxycarbonylphenyl. 83 do 3,4-benzophenyl 3,4'benzopheny1. 84.. o-Methoxyearbonylphenylp-N-ethylphenylsulphamyl. p-N-ethylphenylsulphnmyl. 85 2-methoxy-4-pheny1.. 2-methoxy4-phenyl Z-methoxy-tphenyl.
  • o-Methylphenyl ... o-Methylphenyl o-Methylphenyl. .do p-Benzoyloxyphenyl p-Benzoyloxyphenyl. 88.. -N-methylacetamido-pheny1.
  • o-N-ethylbutyramldophenyl o-N-ethylbutyramidophenyl.
  • o-N-methylacetamidophenyl o-N-methylacetomidophenyl.
  • o-N-methylpropionamidopheny1 ... 0-N-methylpropionamidopheny1.
  • o-Methylthiophenyl o-Methylthiophenyl o-Methylthiophenyl o-Methylthiophenyl. o-l-naphthylphenyl. o-Phenoxyphenyl o-Phenoxyphenyl. o-2-naphthylphenyl. o-2-naphthylphenyl o-2-naphthy1phenyl. o-tertlentylphenyl. o-tert.Penty1pheny1 o-tert.Pentylphenyl. edentyloxyphenyl o-Pentyloxyphenyl o-Pentyloxyphenyl.
  • CN isomers not listed in the Table I above and that are suited for being used according to the present invention have for R and R a phenyl group and for R a 4-chlorophenyl or 4-fluoropheny1 group.
  • the bi-imidazoly1 compounds can be prepared according to methods describedby Hayashi, C. S. in Bull. Chem. Soc., Japan, 33, 565 (1960), the French patent specification 1,351,818, filed Mar. 20, 1963 by Du Pont de Nemours, and the British patent specification 997,396, formula: filed Mar. 21, 1963 by Du Pont de Nemours. X
  • the oxidative dimerisation is carried out in alkaline organic me- Z r I Z: dium by means of a cyanoferrate(III) such as potassium 0 cyanoferrate(III).
  • a cyanoferrate(III) such as potassium 0 cyanoferrate(III).
  • a H 1,2-bi-imidazole (the O'N isomer) is obtaiied bu; somgwhereim times also the 1,1-, the 1,4'.-,'2,2--2,4- an 4,4- i-imi azoles (the latter being the 0-0 isomer) mixed with the X fgfi i gi gf gf Sulphur NH 1,2'-isomer.
  • the mtermeqlate Sheet Z and Z each represent the necessary atoms to close Reducing compounds that-when mtunately mixed with 70 a carbocyclic aromatic ring benzene ring the bi-imidazolyl compounds-are capable to become oxieluding a substituted benzene ring.
  • dized by means of the photo-exposed bi-imidazolyl com- Reducing compounds of class (1) are pounds belong to the class of organic compounds contain- (1) ing a Zerewitinoif hydrogen atom and more particularly, Jae-@ e.g., belong to one of the following classes: 75
  • Reducing compoundsof class (A) are e.g.:
  • amino-9',IO-dihydroacridines e.g. Y 3,6-bis(benzylamino)-9,l-dihydro-9rmethylacridine, 3,6-bis(diethylamino)-9-hexyl-9',l0 dihydroacridine,
  • aminodihydrophenazines e.g. 3 ,7 -bis benzylethylamino) -5 IO-dihydro-S-phenylphenazine, 3 ,7-bis (diethylamino) -5-hexyl-5,10-dihydrophenazine, 3,7-bis(dihexylamino)-5,10-dihydrophenazine, 3,7-bis(dimethylamino)-5-(p-chlorophenyl)-5,10-
  • dihydrophenazine 3,7 -diamino-5- (o-chlorophenyl) -5,10-dihydrophenazine, 3,7-diamino-5,lO-dihydrophenazine, 3,7-diamino-5 l0-dihydro-S-methylphenazine, 3,7-diamino-5-heXyl-5,IO-dihydrophenazine, 3,7-bis(dimethylamino)-5,10-dihydrophenazine, V 3,7-bis(dimethylamino)-5,10-dihydro-5-phenylp phenazine, and
  • aminophenoxazines e.g. 3,7-bis(dimethylamino)-phenoxazine, 3,7-bis(diethylamino)-phenoxazine, 3,7-bis(dibutylamino)-phenoxazine, 3-diethylamino-7-dimethylamino-2-methylphenoxazine, 3-dimethylamino-7-dipropylaminophenoxazine, 5-dimethylamino-9-diethylamino-12H- benzo[a]phenoxazine, S-dibenzylamino-9-diethylamino-l2H- benzo[a]phenoxazine, and 5,9-bis(diethylamino)-12H-benzo[a]phenoxazine.
  • oxidizable compounds are volatilizable e.g. between a temperature of 60' to 140 C.
  • the light-sensitive sheets used according to the present invention contain at least one biimidazolyl compound in a ratio from 2 to 5 mole to 1 mole of reducing agent.
  • the biimidazolyl compound is applied in an amount of 0.5 to 2 g. per sq.m., but the amount can be adapted according to the requirements of the copying process and the kind of reductor and reducible substance.
  • the biimidazolyl compound and reducing agent which is transferable by heat in volatilized or molten state, are applied together from a solution or dispersion preferably in the presence of a film-forming binding agent.
  • binding agent for the photosensitive layer all kinds of natural, modified natural and synthetic resins can be used, e.g. proteins such as gelatine, cellulose derivatives, e.g. a cellulose ether: such as ethylcellulose, cellulose esters, carboxymethylcellulose, alginic acid and derivatives, starch ethers, galactomannan, polyvinyl alcohol, poly-N- vinylpyrrolidone, polymersderived from u,/3-ethylenically unsaturated compounds, e.g.
  • proteins such as gelatine, cellulose derivatives, e.g. a cellulose ether: such as ethylcellulose, cellulose esters, carboxymethylcellulose, alginic acid and derivatives, starch ethers, galactomannan, polyvinyl alcohol, poly-N- vinylpyrrolidone, polymersderived from u,/3-ethylenically unsaturated compounds, e.g.
  • homoand co-vinyl polymers such as polyvinyl chloride, copolymers of vinyl chloride and vinyl acetate partially saponified polyvinylacetate, copolymers of acrylonitrile and acrylamide, polyacrylic acid esters, polymethacrylic acid esters, or polyethylene.
  • the photosensitive material may consist of a self-supporting sheet by using a film-forming binding agent to attain that result, or may comprise a photosensitive layer applied to a support.
  • Suitable supports are, e.g., paper supports of which glassine paper is a preferred one, and resin supports known in silver halide photography. It is also possible to apply the photosensitive material to glass or metal plate or to a support from which it can be stripped OE and transferred to a permanent support.
  • a receptor material used in conjunction with the photosensitive material contains a substance that is a reactive component in a colour reaction with the reducing compound contained in the photosensitive sheet.
  • a practical test that can be used to know whether a particular reducible compound used in a receiving sheet is suited or not to produce a visible colour change is to heat the elected reaction partners in one of the above binding agents or an inert solvent beyond a temperature of 60 C. with a particular reaction partner to be used in the receiving sheet, and to take notice, e.g. between and C. of the degree of colour change in the layer or test tube.
  • a relatively high reactivity of a particular reducing agent with the photoexposed biimidazolyl compound is important to obtain clear copies onthe receptor sheet Within a suitable exposure and processing time.
  • Reaction partners for at least some of the reducing compounds of the classes (1) to (4) forming a coloured product therewith are listed in the following Groups (I), (11), (IE) and (IV).
  • Heavy metal compounds especially of metals of the third, fourth and fifth main group as well as of the Ist, the IInd, the VIth, the VHth and the VIlIth auxiliary group of the Periodic Table, e.g. compounds of the following heavy metals: cadmium, mercury, iron, cobalt, nickel, copper, silver, gold, bismuth and thallium.
  • salts of these metals with long chained aliphatic carboxylic acids e.g. nickel stearate, cobalt palmitate, iron stearate, the addition compound of bis? muth nitrate with an amine, e.g. triethanolamine.
  • noble metal compounds e.g.
  • silver compounds which under the conditions of the copying process of the present invention are extremely nonlight-sensitive, e.g. the silver salts of aliphatic carboxylic acids with a thioether group such as those described e.g. in the British patent specification 1,111,492 filed Aug. 13, 1965 by Agfa A.G., or silver salts of longchained aliphatic (preferably at least C carboxylic acids such as silver behenate, silver palmitate, silver stearate and others.
  • aliphatic carboxylic acids with a thioether group such as those described e.g. in the British patent specification 1,111,492 filed Aug. 13, 1965 by Agfa A.G.
  • silver salts of longchained aliphatic preferably at least C carboxylic acids such as silver behenate, silver palmitate, silver stearate and others.
  • the image consists of the metal in question and/ or of a reaction product of the transferred image forming compound.
  • leucophthalocyanines are colourless or but light coloured products, in which the phthalocyanine frame already is developed completely, and that can be converted to phthalocyanines by a reduction process. In this reduction process constituents can be split off occasionally simultaneously, which constituents are comprised by the molecule of the leucophthalocyanine and not by the phthalocyanine.
  • the preparation of such leucophthalocyanine can occur e.g.
  • NiPc, CoPc or ZnPc are prepared, and thereupon are provided of additional ligands under oxidative conditions, or if a reaction mixture which is suited in itself for the preparation of the phthalocyanine, is heated below the temperature required therefore is reached, or if the reduction potential necessary for the formation of the phthalocyanine is not applied.
  • metal containing leucophthalocyanines for the metal free leucophthalocyanines are relatively instable.
  • metal containing leucophthalocyanines for the metal free leucophthalocyanines are relatively instable.
  • very stable and little coloured leuco-cobalt-phthalocyanines are especially favourable.
  • ethylene diamine other diamines or polyamines can be built in as ligands, such as propylenediamine-(1,2) and propylenediamine-(1,3), mono-ethylpropylenediamine-( 1,3 hydroxyethylethylenediamine, N-methyl-N-fl-hydroxyethylpropylenediamine, N,N'-diethyl-ethylenediamine, N,N-di-(fi-aminoethyl)-ethylenediamine, N,N'-di(fl-aminoethyl)-ethylenediamine, N,N-di[ 3-(fi-aminoethyl)-aminoethyl]-amine or also monoamines such as 3-(2-ethylhexyloxy)-propylamine(1) or stearylamine.
  • the solubility properties of the corresponding leuco-cobalt phthalocyanine depend on the nature of the built in
  • a partner for a colour forming reaction in the receiving layer is absolutely superfluent. This applies for the image-forming phenols or naphthols, which on heating with themselves or in the 12 presence of aerialoxygen yield sufficiently coloured compounds.
  • simple uncoated paper stock can be used as receiving material.
  • the image-receiving layers may contain further additives which ameliorate the colour tone e.g. 1-(2H)-phthalazinone, as toner, and which accelerate the reaction for the formation of the image substance, e.g. sterically hindered phenols that on heating become reactive partners in the reduction reaction e.g. 2,4,6-tri-tert.butylphenol.
  • Suitable image-receiving layers are known already e.g. from the U8. patent specifications 3,094,417 of Wesley R. Workmans, issued June 18, 1968, 3,094,619 of Edwin A. Grant, Jr., issued June 18, 1963 and 3,094,620 of John L.
  • the usual light source for copying purposes can be used here e.g. mercury lamps, iodine quartz lamps or incandescent lamps.
  • the inherent spectral sensitivity of the photo-sensitive materials depends on the nature of the biimidazolyl compounds used. Most biimidazolyl compounds are sensitive to ultraviolet light of a wavelength below 300 nm. The spectral sensitizability of said compounds makes it possible, however, to use visible light for the exposure step.
  • reflex exposure being particularly interesting for the reproduction of graphic originals having lightabsorptive image areas on an opaque reflecting background.
  • Transfer of image forming compounds from the unexposed areas of the light-sensitive layers in the imagereceiving layer occurs preferably at a temperature, comprised between and 200 C. Heating can occur e.g. by conveying the exposed light-sensitive layer in contact with an image-receiving layer over hot plates or rollers or by irradiation with infrared light.
  • a temperature comprised between and 200 C.
  • Heating can occur e.g. by conveying the exposed light-sensitive layer in contact with an image-receiving layer over hot plates or rollers or by irradiation with infrared light.
  • the most favourable temperature and time of heating of course depends on the nature of the image-forming compound to be formed and can be obtained by few simple tests.
  • spectral sensitizing agent for the photosensitive material As spectral sensitizing agent for the photosensitive material according to this invention practically a number of compounds are suited, which also have been used for the spectral sensitization of silver halide emulsion layers. These are preferably cyanine dyes, merocyanines, styryl dyes and rhodacyanine of all sorts, e.g. as described by F. M. Hamer. The Cyanine Dyes and related Compounds, 1964, e.g. as described on pages 90, 100, 433, 502 and 511.
  • methine dyes according to the three following general Formulae A, B or C are preferably used.
  • each of Z and Z represents an oxygen atom or a N-R
  • R represents an alkyl group or a sub- 3 represents hydrogen or a lower alkyl group e.g. methyl or ethyl, 7
  • each of R and R represents a substituent of the type contained in cyanine dyes on the cyanine nitrogen atom, e.g. an alkyl group such as methyl, ethyl, propyl,
  • a sulphocarbomethoxymethyl group such as a sulphocarbomethoxymethyl group, a w-sulphocarbopropoxymethyl group, a w-sulphocarbobutoxymethyl group, a p (w-tsulphocarbobutoxy) benzyl group, the group AW-NHVB wherein A, W, V and B have the same significance as set forth in United Kingdom patent specification'904,332, filed July 5, 1957 by Gevaert Photo-'Producten N.V. such as a N-(methylsulphonyl) carbamyl methyl group, 7 (acetylsulpharnyl)-propyl, a 6- (acetylsulphamyl) butyl group,
  • each of Y and Y represents a substituent having an elecgroup wherein R ha's'the same significance as described above,
  • n is a positive integer indicating the number of substituents on the benzene nucleus
  • X is an anion e.g. Cl-, Br, 1, C10;, CH 'SO; or
  • moQ- s Olbut is not present when the R group contains already anv anionic part ,(betaine-structure) e.g. -tSO R represents an alkyl group or a substituted alkyl group e.g. a C C alkyl group, such as methyl, ethyl, npropyl, n-butyl, benzyl, phenylethyl, a cycloaliphatic group, an unsaturated aliphatic group, e.g. allyl, or an aryl group e.g. a mononuclear aromatic group of the benzene series such as phenyl, or 0-, mor p-tolyl,
  • each of L L L and L represents a methine group
  • a substituted methine group e.g. a methine group substituted with a lower alkyl group
  • Z represents the atoms necessary to complete a heterocyclic nitrogen-containing nucleus comprising 5 to 6 atoms in the heterocyclic ring such as those of the thiazole series (e.g. thiazole, 4-methylthiazole, 4-phenylthiazole, S-methylthiazole, S-phenylthiazole, 4,5-dimethylthiazole, -4,5-diphenylthiazole, 4-(2-thienyl)-thiazole), those of the benzothiazole series (e.g.
  • naphtho[2,1-d]thiazole naphtho[l,2-d]thiazole, 5 methoxynaphtho[1,2-d]thiazole, 5 ethoxynaphtho- 1,2-d] thiazole, 8-methoxynaphtho [2,1-d] thiazole, 7- methoxynaphtho[2,1-d]thiazole), those of the thianaphtheno[7;6-d1thiazole series (e.g. 7-methoxythianaphtheno[7,6-d]thiazole), those of the oxazole series (e.g.
  • benzoxazole S-chlorobenzoxazole, S-methylbenzoxazole, S-phenylbenzoxazole, -6-methylbenzoxazole, 5,6 dimethylbenzoxazole, 4,6 dimethylbenzoxazole, S-methoxybenzoxazole, 6-methoxybenzoxazole, S-hydroxybenzoxazole, 6-hydroxybenzoxazole), those of the naphthoxazole series (eig. naphtho[2,1-d]oxazole, naphtho[1,2-d]oxazole), those of the selenazole series (e.g.
  • thiazoline 4 methylthiazoline, 4 hydroXymethyl-4-methylthiazoline, 4,4-bis-hydroxymethylthiazoline, 4-acetoxymethyl- 4 methylthiazoline, 4,4 bis-acetoxymethylthiazoline), those of the oxaline series (e.g. oxazoline, 4-hydroxymethyl-4-methyloxazoline, 4,4-bis-hydroxymethyloxazoline, 4-acetoXymethyl-4-methyloxazoline, 4,4-bisacetoxymethyloxazoline), those of the selenazoline series (e.g. selenazoline), those of the 2-quinoline series (e.g.
  • lethylbenzimidazole l-phenylbenzimidazole, l'-ethyl-5- chloro 6 bromobenzimidazole, l-ethyl-S-phenylbenzimidazole, 1-ethyl-S-fluorobenzimidazole, 1-ethyl-5,6- difluorobenzimidazole, 1 ethyl-5-cyanobenzimidazole, 1(,8-acetoxyethyl) 5 cyanobenzimidazole, l-ethyl-S- chloro-6-cyanobenzimidazole, 1-ethyl-5-fluoro-6-cyanobenzimidazole, 1-ethyl-5-acetylbenzimidazole, l-ethyl- S-chloro-6-fiuorobenzimidazole, 1-ethyl-7-carboxybenzimidazole, 1-ethyl-7-carboxybenzimidazole,
  • n 1 or 2
  • n 2 or 3
  • each of P and Q represents an electronegative substituent
  • P and Q together represent the necessary atoms to close a cyclic ketometh'ylene nucleus e.g. an imidazolonethione or rhodanine nucleus.
  • each of R' and R' represents an alkyl group, e.g. a (C -C alkyl group or an aralkyl group, e.g. a benzyl group, each of L L L and L represents a methine group, including a substituted methine group,
  • Ar represents a bivalent aromatic nucleus, e.g. a phenylene group
  • p 1 or 2
  • Z represents the atoms necessary to complete a heterocyclic nitrogen containing nucleus comprising 5 to 6 atoms in the heterocyclic ring e.g. a pyridine nucleus, a thiazole nucleus, an oxazoline or a quinoline nucleus.
  • the sensitizing agents may be added to the photosensitive composition in a suitable solvent such as short chained aliphatic alcohols or aqueous systems.
  • a suitable solvent such as short chained aliphatic alcohols or aqueous systems.
  • concentration of the spectral sensitizing agent(s) may vary within wide limits. In general amounts comprised between 0.05 and 0.3 mole/per mole of biimidazolyl compound have been proved as sufficient.
  • sensitizing agents for a particular biimidazolyl compound can be determined by means of the usual sensitometric tests, without difficulty by those skilled in the art.
  • sensitizing agents not only an increase of sensitivity is reached but also a marked increase of the general sensitivity, which is desirable for obtaining shorter times of copying.
  • sensitization of layers according to this invention also for the red and green region of the spectrum it is possible not only to copy coloured originals in an unobjectional way but also to prepare copies in natural colours by a suitable choice of the image forming systems which yield dyestuffs in the substractive selection colours.
  • the photo-oxidizing biimidazolyl compound is preferably used in combination with a volatilizable reducing agent in a sheet, which is the so-called intermediate sheet, a preferred reducing agent for that purpose is 4-methoxynaphthoL- Said sheet co-operates after its information-wise electromagnetic irradiation with a receiving material, the socalled receptor sheet that contains a reducible substance, e.g. silver behenate, for producing a colour reaction with the reducing agent treansferred by heat after the information-wise exposure of the intermediate sheet.
  • a reducible substance e.g. silver behenate
  • the unitary photothermosensitive copy sheet yields when applied in a reflux exposure technique a copy that is directly legible through the rear side of the transparent support.
  • a pigment such as titanium dioxide and zinc oxide having an average grain size of 5 to 1 when applied in an ethyl cellulose binder allow the vaporized reducing agent e.g. 4-methoxynaphthol to pass through the vapour permeable interlayer and to react with the reducible substance e.g. silver behenate.
  • the vaporized reducing agent e.g. 4-methoxynaphthol
  • the permeable layer may alternatively be replaced by a normally impermeable thin coating of a-fusible filmforming material which melts and becomes compatible with the underlaying binder medium for the reducible substance.
  • a-fusible filmforming material which melts and becomes compatible with the underlaying binder medium for the reducible substance.
  • Heat may be applied by conventional thermographic front-printing procedures using infra-red radiation. Replacing the printed original with a continuously infrared-absorptive black paper, plate, roller and irradiating that absorptive material in contact with the photothermosensitive sheet causes overall reproducible heating.
  • a fusible medium e.g. a fusible waxy or resinous medium. Transfer can be speeded up by using a solvent causing some swelling as described in the United Kingdom patent specification 1,135,371, filed Jan. 7, 1966 by Agfa-Gevaert A.G. Heat transfer of polymer substrata without solvent swelling is described e.g. in the Belgian patent specification 700,- 472, filed June 26, 1967 by Gevaert-Afga N.V. corresponding with the United Kingdom patent specification 1,195,842, filed June 24, 1966 by Gevaert-Afga N.V.
  • a photosensitive intermediate sheet was prepared by coating a glassine type paper base in a ratio of 40 g. per sq.m-. with a solution of the following composition:
  • a'receptor sheet which is a white paper prepared by coating and drying thereon a continuous thin colour-
  • a photosensitive intermediate sheet was prepared by coating a map overlay tracing paper in a ratio of 50 g. per sq.m. with a solution of the following composition:
  • EXAMPLE 3 A transparent subbed polyester film of 0.10 mm. thickness was supplied in a ratio of 30 g. per sq.m. with a solution of the following composition:
  • N-(2,4-dinitrophenyl)-pyridinium chloride ...g.. 5 Saponine
  • g 0.2 Polyoxyethylene hydroxyethylcellulose (marketed under the trade name Cellosize WP 09 by Union Carbide & Carbon, New York) g 1 Water ml 100 A dark-brown positive image on a yellow background was formed. 1
  • EXAMPLE 4 The intermediate sheet of Example 1 was sensitized to visible light by adding to the coating composition for every 500 ml. 1 g. of 2-(p-dimethylaminostyryl)-benzothiazole as spectra'lly sensitizing agent.
  • a direct exposure for 3-0 sec. through a positive transparency with a tungsten filament light source of- 1500 w. placed at a distance of 10 cm. from the intermediate sheet made it possible to produce a sharp positive black copy on contact-heating transfer as described in Example 1.
  • EXAMPLE s The photosensitive intermediate sheet of Example 3 was sensitized to visible light by adding to every 500 ml. of said solution 1 g. of a spectral sensitizing merocyanine dye containing a rhodanine nucleus and having the following structural formula:
  • n-Ifropyl gallate 1 10 Ethylcellulose The solution was applied in a ratio of 30 g. per sq.m. onto a glassine type paper base. After drying at room temperature the material obtained was image-wise exposed for 20 sec. in a direct exposure with a 1000 watt U.V. light source placed at a distance of 5 cm. from the photosensitive coating.
  • EXAMPLE 8 In order to obtain a yellow image on a receiving layer prepared as described in Example 7, the Z-naphthoic acid amide compound of composition (B) was replaced by 1 g. of 'benzoylacetanilide.
  • EXAMPLE 10 If in the light-sensitive composition of Example 7 l g. of 2-(4-dimethylamino-styryl)-quinoline was added for every 500 ml., exposure could be carried out with visible light (1500 watt lamp for -30 seconds) through a transparent original or to an opaque original.
  • EXAMPLE 11 A U.V. light-sensitive layer was obtained by coating a polyester film or tracing paper with the following composition: i
  • EXAMPLE 12 The material of Example 11 could be used by employing as a receiving layer a paper which had been coated with the following mixture that had been ball-milled for 10 hours:
  • Example 11 was repeated but the phenothiazine'in the photosensitive material was replaced by phenoxazine. After exposure as described in Example 8 a black image was obtained.
  • Example 13 was repeated but mercury(II) stearate was incorporated into the receiving layer. After exposure as described in Example 6 a brown image was obtained.
  • EXAMPLE 15 A photosensitive intermediate sheet was prepared by coating a glassine type paper base in a ratio of 40 g. per
  • the sheet was pressed at C. for 5 sec. with its photosensitive layer in contact with a receptor sheet which is a white paper prepared by coating and drying thereon a continuous thin colourless layer of a ball-milled mixture of silver behenate, phthalazinone as toning agent, 2,6-di-tert.-butyl-4-methylphenol as heat-sensitive reductor, poly-tert.butyl methacrylate as binding agent (3 parts for every 10 parts of silver behenate) and 86 parts of acetone
  • the dried receptor sheet contained per sq.m. an amount of silver behenate equivalent with 0.2 g. of silver per sq.m., 400 mg. per sq.m. of phthalazinone, and 40 mg. per sq.m. of 2,6-di-tert.-butyl- 4-methylphenol.
  • a method of recording information comprising the CH 398 6 3 / ⁇ /S m steps of (1) imagewise exposing to activating electromagnetic radiation a photosensitive recording element -N comprising a photo-oxidizing biimidazolyl compound that stands in chemically reactive contact with a compound 4 mom), 396 7 having reducing properties, which properties are destroyed by a reaction in the exposed areas of the element with the photo-oxidized bi-imidazolyl compound, (2) uniformly contacting the thus-exposed element with an H 400 7 image-forming compound reactive on heating with said 5 Nw reducing compound to produce a distinctive coloration, and (3) heating the exposed element while in contact with said image-forming compound to produce a visible N image corresponding to the unexposed areas of said element by reaction of the reducing compound in said areas with said image-forming compound, said biimidazolyl compound having the general formula: V
  • each of R R and R stands for a carboeyclic orheterocyclic group with aromatic character, said group being free from Zerewitinolf hydrogen atoms and each dotted line circle represents 4 delocalized electrons, and said compound having reducing properties is selected from:
  • aromatic polyhydroxyl compounds and oxidizable derivatives thereof (2) aromatic polyamino compounds and oxidizable derivatives thereof; (3) aromatic hydroxyl-amino compounds and oxidizable derivatives thereof; and (4) compounds of the general formula:
  • X represents oxygen, sulphur, -NH-,
  • Z and Z each represent the necessary atoms to close a carbocyclic aromatic ring.
  • R represents a substituent free from active hydrogen atoms and R R and R represent hydrogen or substituents free from active hydrogen atoms or two in adjacent positions taken together form a benzo ring.
  • R represents a substituent free from active hydrogen atoms and R R and R represent hydrogen or substituents free from active hydrogen atoms or two in adjacent positions taken together form a benzo ring.
  • B and D are phenyl groups which are unsubstituted or substituted with up to three substituents free from active hydrogen atoms, two of which, in adjacent positions on the phenyl ring, may together form a benzo ring; with the proviso that at least one of the ortho positions in each of the phenyl groups B and D is unsubstituted.
  • a method according to claim 1 wherein said compound having reducing properties is volatile between 60 and 200 C.
  • said reducing compound is a phenol or napthol having at least two hydroxyl groups directly bonded to the aromatic ring or an ether thereof.
  • said reducing compound is an aromatic hydroxyl-amino compound of the benzene or naphthalene series in which compound a hydroxyl group and an amino group are present in orthoor para-position.
  • a method according to claim 10 wherein the photooxidizable compound is 4 methoxy-l-naphthol.
  • the noble metal salt is a silver salt of an aliphatic carboxylic acid having from 8 to 24 carbon atoms.
  • a method according to claim 14 wherein the silver salt is silver behenate.
  • a photosensitive recording material containing a bi-imidazolyl compound and in chemically reactive contact with said compound ('1) a phenol or naphthol having at least two hydroxyl groups directly bonded to the aromatic ring or an ether of said phenol or naphthol, or (2) an aromatic hydroxyl-amino compound of the benzene or naphthalene series, in which a hydroxyl group and an amino group are present in orthoor para-position, said bi-imidazolyl compound corresponding to the general formula:
  • a photosensitive recording material according to claim 16 wherein the photo-oxidizable compound is 4- i'nethoxy-l-naphthol. r

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Heat Sensitive Colour Forming Recording (AREA)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
US00132612A 1970-04-09 1971-04-08 Positive working photo-thermographic materials containing bi-imidazolyl compounds and reducing agents and the use thereof in color development Expired - Lifetime US3734733A (en)

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CA (1) CA972609A (enrdf_load_stackoverflow)
DE (1) DE2117054A1 (enrdf_load_stackoverflow)
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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3877943A (en) * 1973-02-06 1975-04-15 Fuji Photo Film Co Ltd Heat developable photographic material
US4081278A (en) * 1977-05-23 1978-03-28 Eastman Kodak Company Heat sensitive dye layers comprising a benzopinacol
FR2403580A1 (fr) * 1977-09-19 1979-04-13 Eastman Kodak Co Produit photographique contenant un colorant blanchissable sous l'action de la chaleur
US4281058A (en) * 1979-09-10 1981-07-28 Energy Conversion Devices, Inc. Tellurium imaging composition
US4340662A (en) * 1979-09-10 1982-07-20 Energy Conversion Devices, Inc. Tellurium imaging composition
US4446224A (en) * 1982-06-28 1984-05-01 Energy Conversion Devices, Inc. Tellurium imaging composition including alcohol
US4448877A (en) * 1982-06-28 1984-05-15 Energy Conversion Devices, Inc. Tellurium imaging composition including water
US4451556A (en) * 1982-06-28 1984-05-29 Energy Conversion Devices, Inc. Tellurium imaging composition including base
US4535055A (en) * 1982-07-26 1985-08-13 Energy Conversion Devices, Inc. Self-fixing imaging film containing reductant precursor
US5652091A (en) * 1995-10-31 1997-07-29 Eastman Kodak Company Heat bleachable elements having polymeric acid layer adjacent heat bleachable antihalation layer
US5672562A (en) * 1996-05-08 1997-09-30 Eastman Kodak Company Thermal recording element
US5705323A (en) * 1995-10-31 1998-01-06 Eastman Kodak Company Heat bleachable antihalation composition, elements containing same and method of use
US20050053864A1 (en) * 2003-09-05 2005-03-10 Rolf Dessauer Phthalocyanine precursors in infrared sensitive compositions

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2758209C3 (de) * 1977-12-27 1980-07-10 Du Pont De Nemours (Deutschland) Gmbh, 4000 Duesseldorf Lichtempfindliches Aufzeichnungsmaterial
US4252887A (en) * 1979-08-14 1981-02-24 E. I. Du Pont De Nemours And Company Dimers derived from unsymmetrical 2,4,5-triphenylimidazole compounds as photoinitiators
JPS6131293A (ja) * 1984-07-24 1986-02-13 Sharp Corp 感熱記録方法

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3877943A (en) * 1973-02-06 1975-04-15 Fuji Photo Film Co Ltd Heat developable photographic material
US4081278A (en) * 1977-05-23 1978-03-28 Eastman Kodak Company Heat sensitive dye layers comprising a benzopinacol
FR2403580A1 (fr) * 1977-09-19 1979-04-13 Eastman Kodak Co Produit photographique contenant un colorant blanchissable sous l'action de la chaleur
US4281058A (en) * 1979-09-10 1981-07-28 Energy Conversion Devices, Inc. Tellurium imaging composition
US4340662A (en) * 1979-09-10 1982-07-20 Energy Conversion Devices, Inc. Tellurium imaging composition
US4448877A (en) * 1982-06-28 1984-05-15 Energy Conversion Devices, Inc. Tellurium imaging composition including water
US4446224A (en) * 1982-06-28 1984-05-01 Energy Conversion Devices, Inc. Tellurium imaging composition including alcohol
US4451556A (en) * 1982-06-28 1984-05-29 Energy Conversion Devices, Inc. Tellurium imaging composition including base
US4535055A (en) * 1982-07-26 1985-08-13 Energy Conversion Devices, Inc. Self-fixing imaging film containing reductant precursor
US5652091A (en) * 1995-10-31 1997-07-29 Eastman Kodak Company Heat bleachable elements having polymeric acid layer adjacent heat bleachable antihalation layer
US5705323A (en) * 1995-10-31 1998-01-06 Eastman Kodak Company Heat bleachable antihalation composition, elements containing same and method of use
US5672562A (en) * 1996-05-08 1997-09-30 Eastman Kodak Company Thermal recording element
US20050053864A1 (en) * 2003-09-05 2005-03-10 Rolf Dessauer Phthalocyanine precursors in infrared sensitive compositions

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FR2089284A5 (enrdf_load_stackoverflow) 1972-01-07
DE2117054A1 (de) 1971-10-21
GB1345331A (en) 1974-01-30
BE765538A (nl) 1971-10-08
CA972609A (en) 1975-08-12

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