BE738229A - - Google Patents

Description

       

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  Photographic goods containing new light absorbing layers,

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The present invention relates to a new class of photographic materials containing light absorbing layers and / or antihalation layers, which are susceptible to discoloration under the action of heat or light.



   A well-known use of dyes in photography is the preparation of layers serving to reduce the halo or to absorb certain undesirable radiations coming to strike the layer or the photosensitive layers either during normal exposure or during exposure to light. inversion, in the case of products treated by 0 inversion. ' The antihalation layers can be deposited directly on the front or back of the transparent photograpnic support on which the photosensitive composition is deposited. The filter layers can be deposited on the photosensitive layers or between these layers in the case of products comprising several photo- layers; sensitive. The dyes used in these various layers must have particular spectral absorption characteristics.



   They must be capable of being easily inserted into a hydrophilic layer permeable to water and be firmly fixed therein so as not to diffuse during the manufacture of the photographic material or subsequently during its storage. It is generally necessary to use light absorbing dyes which are quickly and easily rendered inactive, ie discolored or destroyed and removed before, during or after photographic processing. In many cases it is particularly advisable to use dyes which are rendered inactive by one of the solutions used for the photographic treatment of the exposed product, for example by the developer or by the fixer, in the case of photography. with silver salts.

   Known dyes which have the desirable characteristics from the viewpoint of spectral absorption do not always exhibit the proper characteristics from the point of view of subsequent discoloration, and reproductions made with photographic materials containing these dyes sometimes show stains. unwanted. Other proposed dyes do not exhibit the required stability when introduced into gelatin-based compositions.



   The photographic elements according to the invention contain colorants defined below. These dyes can be prepared as indicated in the Belgian patent application filed today in the name of the applicant and entitled: "New nitrogenous heterocyclic organic compounds". These dyes can be used in layers

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 EMI3.1
 absorbing light or noana: l; ni d * Wd db. 1 antihalo layers and in filter layers arranged among silver halide photographic materials, which contain one or more photosensitive silver halide layers.

   We can
Easily introduce these dyes into those colloidal binders used to force such coatings; they can also be deposited to make layers devoid of binder. These dyes are particularly useful in gelatin layers adjacent to the silver halide layers; they are also particularly useful in information recording methods using dry products, without liquid reagents. These dyes can easily be discolored without the need to remove the layers which contain them.

   The discoloration occurs when the layer containing the dye is subjected to the impact of some form of energy, for example, heating or light radiation. The energy absorption causes the dye molecule to cleave, resulting in the discoloration.



   The subject of the invention is therefore essentially photographic products containing at least one antihalation layer or a filter layer capable of discoloration by energy impact.



   Photographic elements according to the invention comprising a support, at least one photosensitive layer and at least one light absorbing layer are characterized in that the light absorbing layer contains a compound of the formula
 EMI3.2
 in which - R1 can have one of the following meanings: a) a methine bond terminated by a heterocyclic nucleus. - that, of the type contained in cyanine dyes, for example one of the nuclei described in the work by Nées and James "The theory of the Photography Process ", MacMillan ed. 3rd ed., P.198-232, the methine bond possibly being substituted or not and being, for example
 EMI3.3
 ple a bond -CE =, -C (CH) =, -C (C6HS) = '- CH = CH-, -CH = CH-CH-, etc .;

   

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    b) an optionally substituted alkyl radical, advantageously comprising at most eight carbon atoms; c) an aryl radical, optionally substituted, such as a phenyl, naphthyl, tolyl, etc .; d) a hydrogen atom; e) an acyl radical of formula -CO-R9, R9 denoting a hydrogen atom or an alkyl radical, advantageously having at most eight carbon atoms; f) an anilinovinyl radical, such as a radical of the formula -CH = CH-N (R3) -C6H5, R3 denoting a hydrogen atom or an alkyl radical; or g) an optionally substituted styryl radical, for example a radical of formula -CH = CH-C6H4-R2, R2 denoting a hydrogen atom, an alkyl or aryl group or an amino group, in particular dialkyllamino, such as as dimethylamino;

   - R8 may have one of the following meanings: a) a methine bond terminated by a heterocyclic ring of the type contained in merocyanine dyes, described for example in the aforementioned work, the methine bond possibly being unsubstituted or substituted; b) an optionally substituted allylidene radical, such as a cyanoallylidene radical, an alkylcarboxyallylidene or alkylsulfonylallylidene radical; - R can denote:;

   a) an alkyl radical advantageously having from one to eight carbon atoms, such as a methyl, propyl, ethyl, butyl, etc. radical. this radical possibly being substituted, being for example a sulfoalkyl radical, such as the radical - (CH2) SSO3, an arylalkyl radical, for example a benzyl radical, or a pyridinato-oxy-alkyl salt, for example - ( CH2) 3-OY, Y denoting a substituted or unsubstituted pyridinium salt;

   b) an acyl radical, for example -CO-R4, where is an alkyl radical advantageously having from one to eight carbon atoms or an aryl radical, for example a methyl, ethyl, propyl, butyl, phenyl or naphthyl radical, etc. - - Z represents the atoms necessary to complete a heterocyclic ring with five or six .chains, this nucleus containing at least one atom other than a carbon atom, such as an oxygen, sulfur, selenium or nitrogen, this nucleus being, for example, a pyridine, indole, quinoline, etc. nucleus; -

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   - X represents an anion, such as a chloride, bromide, iodide, perchlorate, sulfamate, thiocyanate, para-toluenesulfonate, methylsulfate, tetrafluoroborate, etc.



   These compounds exhibit a set of very
5 valuable, so that they have a large number of possible uses: they can, in particular, enter into photographic products for different purposes. In particular, they form antihalation layers and filter layers which can be decolorized without any chemical reagent simply by sufficiently long exposure to light. These compounds are chemically modified when subjected to the impact of energy in a form which can vary widely.

   Thus they are discolored by electromagnetic radiations, such as ultraviolet, visible and infrared radiations, X-rays, laser beams; They are also decolorized by electron bombardment, by heating, produced in particular by infrared radiation, or by impact of mechanical energy, for example by local application of pressure, in a sound field, etc. When such a coloring compound is subjected to an energy impact, for example by any of the means indicated above, cleavage of the molecule generally occurs. The exact mechanism of the cut may vary somewhat with the dye considered. We can probably admit a mechanism of the following kind, shown schematically on 'a:. particular example.
 EMI5.1
 



  , # = # - # = </ s \ jf 1 1 + CR = CR-CR = / i- - 17. N k.J T * v "Y - V + V + .......



  I. + CSO. ## CSJO -t-1 "I. + CH30 (- 30 rnf) .0 '/ J, R / Ti - additional fragments" 2 "5 In this case, the discoloration under the influence of light is produced by heterolytic cleavage of the N-0 bond with the production of an RO + ion and a dye base which may further fragment. This explanation is given for guidance only. , and its Value does not affect the validity of the invention.

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   According to various embodiments, particularly advantageous, the new photographic elements are characterized in that they comprise at least one filter layer and containing a dye chosen from the compounds corresponding to the following more particular formulas:
 EMI6.1
 

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 EMI7.1
 In these formulas, the symbols have the @ @: - Q1, Q2, Q3, Q3 and Q9 each represent the non-metallic atoms necessary to complete a sensitizing or desensitizing ring comprising a five or six atom heterocycle, of which at minus one atom other than a carbon atom, such as an oxygen, sulfur, selenium or nitrogen atom, i.e. a nucleus of one of the types used in the preparation of dyes cyanine, such as one of the following typical nuclei:

   nuclei of the thiazole family, for example thiazole, 4-methylthia- rings
 EMI7.2
 LO zole, 3-ethylthiazole, 4-phenylthiazole, 5-methylthiazole, 5-phenylthiazole, 4,5-dinethylthiazole, 4,5-diphenylthiazole, 4- (2-thienyl) - thiazole, benzothiazole, 4-chlorobenzothiazole, 4- or 5-nitrobenzothiazole, 5-chlorobenzothiazole, 6-chlorobenzothiazole, 7-chloro-
 EMI7.3
 benzothiazole, 4-methylbenzothiazole, 5-rethylbenzothiazole 6-methylbenzothiazole, 6-nitrobenzothiazole, 5-bronobenzothiazole, 6- bronobenzothiazole, 5-chloro-6-nitrobenzothiazole, 4-phenylbenzo-
 EMI7.4
 thiazole, 4-nethoxybenzothiazole, 5-methoxybenzothiazole, 6-methoxybenzothiazole, 5-iodobenzothiazole, 6-iodobenzothiazole, 4-ethoxybenzothiazole, 5-ethoxfoenzothiazole, tetrahydrobenzothiazole, 5,6- 0 dinethiazole, 5,6- 0 dinethiazole, 5,6- 0 dinethiazole, 5,6- 0 dinethiazole

  6-methylenedioxybenzothiazole, 5-hydroxybenzothiazole, 6-hydroxybenzothiazole, a-naphthothiazole, -naphthothiazole, p, p-naphthothiazole, -aethoxy-p, p-naphthothlazole, 5-etho: cyp-naphthothiazole, 8- naphthothiazole, 7-methoxy-a-naphthothiazole, 4'-Tethoxythianaphthéno-7 ', 6', - 5-t'niazole, nitro-naphthothiazoles, etc. ;

   the rings of the oxazole family, for example the rings 4-methyloxazole, 4-nitro-oxazole, 5-methyloxazole, - 4-phenyloxazole, 4,5-diphenyloxazole, 4-ethyloxazole, 4,5-dimethyl-
 EMI7.5
 oxazole, 5-phenyloxazole, benzoxazole, 5 = chlorobenzoxazole 5-methylbenzoxazole, 5-pr, enylbenzoxazole 5- or 6-nitrobenzoxazole, 5-chlof ro-6-nitrobenzoxazole, 6-methylbenzoxazole, 5 & -diMethylbenzoxazole 4,6-dinoxazole -metho) .. Jroenzoxazole, 5-ethoxybenzoxazole, 6-methoxybenzoxazole, 5-hydroxybenzoxazole, 6-hydroxybcnzoxazole, a-naphthoxazole, p-naphthoxazole, the various nitro naphthoxazoles, etc .;

   nuclei of the selenazole family, for example 4-rethylseienazo3e, 4-nitroselenazole, 4-phenylselenazole, benzoselenazole, 5-chlorobenzoselenazole, 5-neoEnoxybenzoselenazole, 5-hydroxybenzoselenazole, 5-hydroxybenzoselenazole, 6-benzoselenazole, 6-or-6-or-6-nitroselenazole, 5-neoEnoxybenzoselenazole, 5-neoenoxybenzoselenazole, 5-hydroxybenzoselénazole, 5-hydroxybenzoselenazole, 5-neo-or-6-nitroselenazole, 5-neo-neo-benzoselenazole, 5-neo-benzoselenazole, 5-neoenoxybenzoselenazole, 5-neoenoxybenzoselenazole. -nitrobenzoselénazole, tetrahydrobenzoselénazole, α-naphthoselénazole, P-naphthoselénazole, various nitro naphthosélénazoles2 etc .; nuclei of the thiazoline family, for example nuclei

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 EMI8.1
 ..... "c .............. \ thiazoline, li - methylthiazoline, etc .; les:> o" a "OZ.ctQ: <1:! aJ.le for example the rings 2-pyridine, -sethyl-2-pyridinc, ;; 4-pyridine, 3-mei-yl --- p; 'rïâir.e the various nitro-pyridines, etc. ;

   ) the nuclei of the quinoline and .'isoquinoline families, for example the 2-quinoline, 3-mechyl-2-quir.oleine 5-ethyl- = 1 2-quinoIéine, i -chloro-2-r rings, uvnQlein 6-nitro-2-quinoline, 8-chlOrO-¯j 2-quinoline, 6-wethorf-2-quinoline, 8-ethoxy-2-q7ainolinicl 8-h-droxy-2-quinoline) 4-quinoline, 6- ; .étxy -..- quinoline, 6-nitro-4- quinoleine, 't: aLi'ly.i -' i - "'I: vILIQiI'3.rse y U - (.' ailor O 3-quîrtolL '-iÎS 1-isoquino-j LO lein, 6-nitro-1-isoquinoleinLe 3, lt-dihydra-1-isoquinoline, 3-iso-'; quinoline, etc; the rings. 3 = 3-dialccyl.ndoline bearing foremost a nitro or C3ra.no substituent, such as 3,3-di- - ethyl-5 or -niroind> Jlêr3.ine, 3i3-dz: eb.yl-5- or 6-cyanoindolenine rings, etc. .;

   the nuclei of the 111midazole facility, for example the 5 rings, imidazole, 1-alkyllimidazole, 1-alkyl-phenylimidazole, 1-a2coyl- -âimehyliaidazole benzinidazole; 1-alkylbenzir, idazole; 1-alkyl-5-nitiobenzimidazole, i-aryl-5,6-aici-uoù-obenzimîàazole, 3-alca3rl-cc-a aphim.iazole 1-aryl-p-naphthimidazole, 1 = alkyl-5-re- -1 ;; hoxy-a-raaphLi.,. iàazole, the rings of the family of imidazoLI ;, 5-.12 / -: 0 quinoxaline, for example the rings 1-aïriylinidazoL, -L uinoxaline 'such as 3-e ûhylir.ßdazo ,, 5-quinox.aline 6-chloro-1-ethyliaidazo- 1 ± ", 5- wquinoxaline, etc., 1-alkenylimidazo ± $, 5- # quînoxalîne, for example 1-allylimidazoL, 5-Bquinoxaline, 6 -chloro-1-allylimidazo- L, 5-quinoxaline, etc., 1-arYlimidazoLr ;, 5-quinoxaline, egM-;

   ple 1-Phen3Tlirida, o% t, 5quinoxaline, 6-chloro-I-phenylimidazo- - - LÇ, 5- ± Ïqnoxaline, etc. 3,3-dia.coyl-3H-pyrroloL2,3-pyridine rings, for example, -. 3,3-dimethyl-3X-pyrroloµ, 3-flpyridine; 3,3- -12 / pyridine, etc .; the thiazoloLll-, 5-.Q / - nucleus
 EMI8.2
 quinoline; optionally substituted indolyl rings such as :!
 EMI8.3
 2-phenyl-3-indole, ± -methyl-2-phenyl-3-indole rings, etc. ; - R3 represents an optionally substituted alkyl group, advantageously a lower alkyl group, having from one to
 EMI8.4
 four carbon atoms, for example methyl, ethyl,
 EMI8.5
 propyl, isopropyl, butyl, hexyl, alkyl, decyl, dodecyl, etc., 11 .. '1 hydroxyalkyl group, for example 13-l1hydroxyethyl, W-hydroxybutyl, etc., an-alkoxyalkyl group, for example 13-metho) - ethyl, W-butoxybutyl, etc .;

   a carboxyalkyl group, for example 3-carboxyhyl, -carDOxybuty, etc., an alkoxy group, for example methoxy, ethoxy, etc., an ilioalkyl group, for example. i-sulfoethyl, G3-sulfobutyl etc., a sulfatoalkyl group, paT'µ ') 1

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 EMI9.1
 example -S'tlt.W Lot tutyie t a v..Z-S '.:. i.f ô..oiïutß ... C3 C.' Lc:, é f i.ü, t: É;. 'Ofr3? Ri' csxp alkyl, for example 3-acetoxyethyl, Y-acetoypropyl, u) -butyryloxybutyl, etc., an alkox-ycarbonylalkyl group, for example retho: .; carbony2ethyl, u-et'nox.ycarbo nylbuty2e, etc. or an arali coyl group, for example, benzyl, phenethyl, etc .; an alkenyl group, for example allyl, 1-propenyl, 2-butnyl, etc. , or an aryl group, for example, phenyl, tol3cley ¯naphthy3esethoxyphenyl, c1ilorophên: J! etc,;

   z - Q4 represents .3es atons, metallic hon necessary, to complete a heterocyclic ring with five or six members, containing according to a typical example a hetero-atone of nitrogen, sulfur, senna or oxygen, such as a 2-zyrazolin-5-ore nucleus (for example 3-E: ethyl-1-phenyl-2-pyrazolin -? - one, 1-phenyl-2-pyrazolin-5-one, 1- {2-benzot : iazo3yl) -3-methyl-2-pyrazolin-5-o: e, etc.); an isoxa = olone ring, (eg, 3-pbenyl - {.-) -. isoxazolone, 3-methyl-5- (1H) -iso :: azolone, etc.);

   an oxindole ring (eg, 1-alkyl-2,3-dihydroxy-2-oz, znole, etc.), a triketohexahydropyrimidine ring, such as a barbituric acid or por- thiobarbituric acid radical.
 EMI9.2
 both optionally alkyl substituents in position 1 (1-methyl-) 1-propyl-, 1-heptyl, etc.) or in positions 1 and 3 (1,3-dimethyl-,
 EMI9.3
 1,3-diethyl-, 1,3-dipropyl-, 1,3-düsapropyl, 1,3-dicyclohexyl-, 1,3-di (methoyzhyl) -j etc.

   or aryl substituents in position 1 "(1-phenyl-, 1-p-chlorophenyl =, 1-p-é4ho xycarbonylphen3rl-j etc.) or 1 in positions 1 and 3 (1,3-diphenyl-, l3-di (p-cUorophé-.iyl 1,3-di-1 (p-ethoxycarbonylphenyl-, etc.) or an alkyl substituent in-posi-
 EMI9.4
 tion 1 and an aryl substituent in position 3 (1-ethyl-3-phenyl-, 1-n-heptyl-3-phenyl-, etc.), such as a rhodanine ring (i.e.
 EMI9.5
 a nucleus of the 2-thio-2,4-thiazolidinediones), such as a rhodanine nucleus, 3-alkylrhodanine, C3-ethylrhodanine, 3-allylrho-, danine, etc.), 3-carboxyalcoylrhodanine (3-E2 -carboxyethyl) rhodanine, 3- (4-carboxybutyl) rhodanine, etc.), 3-sulifoalcoylrhodanine (3- (2-suI- fcethyl) rhodanine, 3- (3-sulfopropyl) rhodanine, 3- (4-sulfobutyl) rho - danine, etc.), or 3-arylrhadanine (3-phenylrhodanine, etc.), etc .;

   such as a 2 (3H) -imidazorl, 2-.7pyridone or 2-furanone f3-cyano- --ph :: nyl-2 ($ ii) -furanone ring, etc.); such as a thiophen-3-one-1,1-dioxide ring (benzo (bÇthiophen-3 (2H) -one-1,1-dioxide etc.); such as a ring, 7-dioxo-6, - dihydro-5-thiazolo3,2-pyrimidine- (5, -dioxo 3-phenyl-6,7-di: ydro = 5-th.azoloL3,2-apyrimidine, etc.); such as a µ ring 2- thio-2,4-oxazolidinedione (i.e. a nucleus of the family of 2-thio-2,4- (3H, 5Ii) -oxazolediones) (3-ethyl-2-thio- 2,4-oxa- 3

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 EMI10.1
 "'.joz.'., L" "..1 .:"; ..,. ".-: ..:., ..: .. zeir .Gli-iiCGQi4 3-lG-suiii''l. ,, îyi) -G "Ll'.0" G '. (fiûc.ia, i Caloes .... suîfohttyï) -2 -' <io-2, - Gxazolïâir.edio: e 3- (3-carbo >; ypropyl) -2-thio-2,4-oxazolidinedione, etc.); a th.:.anaphthenone ring (2- (2H) -thianaphthha, -ione, etc.);

   such as qulan nucleus 2.-t: ia-23-hiazol.di: edlone cresti% -dire of the family dus -r.zo-2 {3 = i, Lïl3-h.aztled, onesJ (; 3,: "éhyJ .-.



  2-thio-2, -; hiazolidiedione, etc.); such as a 2, t--: h.ao..d3.ne-. dione (2,4-thiazolidinedione, 3-eyß2, -ni.azo.idinium: e 3phé-nyi-2 j --hiazalidir ring .edione 3 --- x-ap yl -, - hiazctîiczßredion, e, etc. 3; such as a thiazolidinone ring (4-thiazols.dinoiie 3 avo- .0 lidinone, 3-pheny-1-4-thiazolinone , 3-c: -riaphthyl-4 - t'hiB.zolidiiMme, etc.); such as a 2-thiazolin-4-one ring (2-eth3rlmercapto-2-thiazolin-4-one, 2-alkylpheny ' 1 G in o-2-iziazali: - ore, 2-diphenylamino-2-thiazoli, i-1 - one, etc.); such as a 2-ß ring,:. Iro w-oxazo3idinone (or , pseudohydantolne);

   such as a 24-iaidazolidinedione 5 (hyàantoine) ring (2,1 + -imiàazolidineàîone, 3-G, hyl-2, -¯inidazolsdïnedione, 3-phenyl -, - i: idazolidïredione, 3-cr.aprrLyi-2 , s: -ircaao3a-dinedione, I3-diet: xyl-2, - i.idaZOlidi-neè; -nrü, l-eihyl-3-phenyl-2, ti: ïdazolïdinedione, 1-ethyl-La-naphthyi-2 , 4-ia.dazo.idin.ed, iane $ 1,3-diphenyl-2,4-i.-aidazolideLnedione, etc.);

   such as a 2-thio-) 2, -i; .iidazolidßr.edio.e (or, 2-thiohydantoin) (2-21; 0-2, - ir3idazolidinedione, 3-hyi-2-hio- ring) 2, - i..ridazolidinedio: e 3- (Y-sulòbutyl) - 2-thi o -2,4-iniidazolidine dione, 3- (2-carhoxyéry?) -2-hio-2, - iidazolidinedione, 3 -p: e: yi-2-hio-2, -iriczazo.idiàeùione. 3-ce-naphthyl-2-hio-2, -iiàazolidinediore, 1,3-diethyl-2-thio-2,4-iaidazolidlne- ' dione, 1-ethyl-3-phenyl-2-thio-2,4-iniidazolidinedione, 1-ethyl-3naphthyl-2-thio-2,4-imidazolidinedione, 1,3-âip'rseryl-2-hio- ,. inidazolidinedione, etc.); or such as a 2-im-i-dazolin-5r-or ring. (2-propylrrercapo-2-iidazolin-one etc.); ; -
 EMI10.2
 - n is a positive integer between 1 and 4; - m is one, two or three; - g is 1 or 2;
 EMI10.3
 - R and R7 each denote a cyano radical, an ester radical {é4noxycarhonyl;

   rethoxycarbonyl-, etc.), or alkylsulionyl (ethylsulfonyl-, methylsulonyl-7 etc.); -L represents a methine chain of formula -C = or. T
 EMI10.4
 T
 EMI10.5
 is a hydrogen atom, an alkyl radical having from 1 to - atoms
 EMI10.6
 carbon or an aryl group (phenyl, etc.) -
 EMI10.7
 - L denotes -CH =, -CCCR3) =; -C (C6H5) = 'etc. ; - D, E, J, R2 and air independently designate atoms

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 EMI11.1
 4: .3'CIaûWey'ù'.eS groups t <3.CO; y''iey containing âVânoo $ êr :: # 'it -d 1 to 4 carbon atoms), (:; ethyl ,. ethyl, propyl , isopropyl, butyl decyl, dodecyl, etc.), o phenyl aryl groups? :

   o3.yî naphthyl,:; st: XY? .2TIyle, c;: loro:; - heny :: 'e, - ni T9':> hey; 71st ,. etc.) -X represents an al'wG'i2e.Gra (chloride, bromide, iodide, perchlorate, tetrsfiuoroborate, suliaçate, thlccyanate,? -i'.al'wG'i2e sulfonate, y a "'t, e ti'.nyi5lli a i.8 etc.); ..



  - represents an aniline radical o? -: iry1i (phenyl, .naphthyl, d4-ale, oy'-aminophé-lyle, tolyle, chlàrop: enle, nx.txtpherériyle, .0 anilinoviny1e. etc.); ". - - .5 'represents' an aleo3 + 1st; fi, oxy or a.cay3é radical: edioxy having from one to eight-, carbon atoms in the aÀcoylene chain or ilil cc'in.e- radical: JwS - '; <i.iCvïy iv-'i un, radical i. Û.jrlü OOx'p. Trimé thylè-eox-y - t. É 1-Ira - é L-nylàè - e oxy, propyleneoxy3 ethylene to dioxy, 5 '., 1, b.' '' 'h etc .;

   and - R represents either an alkyl radical, optionally substituted, having avantaseusene # t from one to four carbon atoms, such as a nethyl, ethyl, propyl, isopropyl, butyl, hexyl, cyclohexyl, decyl, dodecyl, an aralkyl radical , such as a benzyl radical, a su7 ± foalkyl radical, for example -su1Îoethyl j t.-süiobLty3e, -sv: t.fopropyle or an acyl radical, for example a radical of 'Oi-iei7l-e -C (0) -R where denotes a group al-
 EMI11.2
 coyl, optionally substituted or an aryl group, for example a methyl, phenyl, naphthyl, propyl, benzyl, etc. group.



  The most advantageous compounds according to the invention.
 EMI11.3
 are generally those which correspond to the above formulas where C 2 cosplet a pyridine, indole or quinoline ring and where D, E, F
 EMI11.4
 and G denote aryl radicals. In the following, we will denote by
 EMI11.5
 the term “desensitizing nucleus” means a nucleus as defined above, in the formula of which Qui, 2 3? Q7 and C complete an ïMidao, 5-auü.oxa.ir.e ring or a ring substituted by a nitro group,
 EMI11.6
 and chosen from the group formed by thiazole, oxazole,
 EMI11.7
 selenazole, thiazoline, pyridine, quinoline, indole or iidazole.
 EMI11.8
 



  Typical examples of light-decolourable dyes usable in the practice of the invention are as follows:
 EMI11.9
 1. 3-ethyl i'-ctrtOxycXa.-x'-pyriàocaFaoc3ra.ine perchlorate 2. 1'-LWoxy-3-ethylcxa-2'-pyridocarbo- ....., .- cyanine 3.iodide de 3'-etY.yL-1-ir, sxy-2 yridc iücyanine

 <Desc / Clms Page number 12>

 
 EMI12.1
 4.i-Ethoxy-s'-Ethy tetrafluoroborate: 2-3r'acynine 1-beKzyloxy-3'-cthyl-2-pyridothiacyanine iodide 6. 3'-eti.yi-1-uE iodide. :: o :: y-2-py: idothiacarbocyanine 7.l-ethoxY-3'-thy tetrafluoroborate: -2-pyridothiacarbocyan1nl 8.anhydro-3'-cthyl-l- (3-sulfopropoxy) -2-pyridothia- hydroxide
 EMI12.2
 carbocyanin
 EMI12.3
 9. 1-Benzyloxy-3'-ethyl-2-pyridothiacarbocyanine perchlorate.



  10. 3'-ethyl-1 - perchlorate;, é t :: ory-2-Jyr ido t: aiadicar bocyanine 11, l-nethoxy-l, 3s3-trisethylindo-2'-pyridocarboeyanin <0 12. 3'-Ethya-1-rethoxy - + '5'-benzo-2-pyridothiacya- perchlorate
 EMI12.4
 nine
 EMI12.5
 13. 2-ethox-, - 3'-ethy.-r '' benzo-2-pyridothiacarbocyanine tetrafluorobor ate 14. i'-etâoxy¯3¯éthy.oxa-2'-carbocyanin y 15. tetratluoroborate .'- é ':.: ox y-3-et: yithia-2'-cyanï.ne 16. 1'-ethoxy-8-ethylthia-2'-carbocyanin 1? tetrafluoroborate. 1> -ethoxoj-3-ethylthia-2'-dicarbocyanine tetrafluoroborate 18. I-ethoxy-3'-ethyl-2-pyrzdothiazolinocarbo- perchlorate
 EMI12.6
 cyanine
 EMI12.7
 1 19, 3'-ethyl-1-nethoxy-Y-pyridotolacyanine perchlorate 20. 3'-ethyl-1-nethoxy-4-pyridothiacarbocyaniïie perchlorate 21, 11'-diethoxy-2s2'-dip perchlorate:

  .ényi-33'-indolocarbocyanine '22. 1-Ethoxy-l' -. Ethy3-22's10-triphé¯nyl-3a, 3'indolocarbocyanine - - - 23 perchlorate, 1'-diethoxy- 2,2'-diphenyl-3,3'-indolocarbo-
 EMI12.8
 cyanine
 EMI12.9
 24. 1-Ethoxy-1'-methyl-2,2 ', 10-triphenyl-3> 3'-in- perchlorate
 EMI12.10
 dolocarbocyanine
 EMI12.11
 25. Z'-Ethoxy-3-ethyl3-g-benzothia-2'-carbo- tetrafluoroborate
 EMI12.12
 cyanine
 EMI12.13
 26. 2-p-Anilinovinyl-1-Bëthoxypyridinium n-toluenesulionate 27. 1-ethyl-16-ethoxy-, 5-benzothia-4'-carbocyanlne 28. Q-toluenesulrorte de '-ethyl-1-éthoxy- 5'-nitro-2-péray3 -, -
 EMI12.14
 indolothiacarbocyanine
 EMI12.15
 29.

   1-EHpxy-3'-Àtàyl-6'-nitro-2-phenyl-3- α-toluenesulfonate
 EMI12.16
 indolothiacarbocyanine
 EMI12.17
 30. 13-DiaîZyl-1'-aéihx, -2'-phEnylis'idazo quîoxalino-311-1 perchlorate, .idolocarboeyanine -.



  31. I 3-diallyl-l '-2 th -2' -phêr.y.iidaoa 5-- perchlorate

 <Desc / Clms Page number 13>

 
 EMI13.1
 quino; alino-3'-indolocarbocyanine 1 '-9 0 - o a- 9- -yi 000 32. l-nethoxy-2-nethylpyrldinium n-toluénesulio # ate 33. n-tolaènesulionate de l-Nethoxy-4- Methylpyridinium 34. Anhydro-2-scthyl-1- (3-sulfo? Ropoxy) pyridinium hydroxide 3 '. 1-Ethoxy-2-ethylpyridlnium tetrafluoroborate 36. 3.-Bznzyloy-2- bromide: el; lp; ridiuiu.



  37. 1-Ethoxy-2-rsethylquinoline tetrafluoroborate 38. 1-Eiethoxy-2-phenylindole 39. 1-ethoxy-2-phenyl.ndole LO 40. 1'-methoxy-1,3,3-trimethyl-5 perchlorate -nitro-2'-phenylindo-
 EMI13.2
 3'-indolocarbocyanine -
 EMI13.3
 41. I-Siethoy-l '3', 3 '-trirethYl-2-phenyl-3-indo3.o- 2' -pyrro perchlorate? oL2, 3-.pyriGOCarbocyar ..:. e 42. -evhoxy-3'33-vri n-toluenesulionate:

  .iethyl - nitrô-2'- .5 pher.y3indo-3'-indolocarbocyanine 43. 1-ethoxy-l ', 3', 3'-trimethyl-2-phenyl-3-indolopyrrolo ± fi, 3- perchlorate flpyriaocarbocyanine 44. 1,1'-ethylenedioÀJfbispyridinium dibromide. Li3'-trirethylenedioxybispyridinium dibromide D 46. 1,1 * -'- té% 'dibromide, rarethylenedioxybis (2-methylpyridinium) 47. 191'-tetraretyY.ylenedi'cxybis (- ethylpyribromide) dibromide 48. dibromide of 1,1'-tetramethylenedioxybispyridiniUm liq. 1,1'-penta.étnylenedioxybispyridinüun 50. 1-me4hoxy-2-phenylindole-3-carboxaldehyde dibromancer i 51. l-ethoxy-2-phenyllndole-3-carboxaldehyde '' j2, l-acetoxy-2- perchlorate ( 4-diniëthylaainostyryl) pyridiniun 53. 1-benzoyloxy-2- (4-dimethylaràinostyryl) pyridinimm perchlorate: $ 4. 1s 3-diate acid:

   yl - 1-ethoxy-2 (Iii) -pyridylicene) ethyliden 2-thiobarbiturate 2-thiobarbiturate 557. 3-etiayl-GL-sétr.oxy-2 (1Fz) -pYridiylidène) ethylidènrhodani? .e ... '56. li3-dieuethyl-5 (1-: etho.y-2 (13-pyrid;, g.idene) ethylidene) acid)
 EMI13.4
 barbiturate
 EMI13.5
 57. 2 (3 3-dïc y ar.oal.yl idè: ne) -1-ré thocyl p 2-dnhyàropyridine Ô 58. 2 (1-aéhox.y-2 (il) -pyridy.idéne) -éthyiidènenzotr, ophen- 3 () - one-.1-dioxrde. ¯ -. -. -. - z.



  $ '9. 3, -cyanc-S 1-ethoxy-2 (3i) -pyridylidene'-ethylidene-It-phenyl- ,, 2 (5H) -iuranone These coloring compounds can be etched in '
 EMI13.6
 layers deposited in contact with photosensitive layers formed by
 EMI13.7
 a silver halide emulsion, since the nor, ±. '<1' '' ..,

 <Desc / Clms Page number 14>

 
 EMI14.1
 dances have a very good pH stability of most photosensitive silver halide emulsions and have only
 EMI14.2
 little or even no adverse action on the ar- - halide
 EMI14.3
 gent.

   These dyes can also be introduced to filter the
 EMI14.4
 5 light in layers deposited directly on a layer of emul-
 EMI14.5
 photosensitive ion to silver halides or between two layers of emulsions photosensitive to silver halides. These dyes can still be used in layers located
 EMI14.6
 * i; .t # .z the support and a photosensitive halide layer of "'s.rgeE'ë o cia2s dorssia strains a # 1; 11; aloo E: eê, nioà <: Lt, s. p : # * i = ogoezujni <g <xes qui coEprennenù les rt (::? ell & 3 couchss E.M'soF-;> * zt?, a .'Lur;: ie? e = vei; iz / #; (# conptendoee des cc.uichea -f.èEsio paotcsm, x ± # 1, z is: # el.le has:

   halides of ".. aigen ': =' 1".; ", '3 a" * và gives dc' =, mag *; J *. ')' "p?) 'nf' '' '["'. '"aìzsi. # 1 .OS mi>: # = in> éi 1 iJj; Tg e àéo # -1" 1 ax i == z # et #' Jes g.tiàs-ù. = iz aos j-iil = i2 and 3 <,. 7.?2 '' ,, qui scat p? #i #> -,; ce jz-e gy, jp g, bj¯ s -On p #> 4pa .é the layers ab-corbirz 'the Iraiere in the products pho' & ogrs.pI'M.cmes according to 1'Rventlon es dc-posan sur. Xe S: .1) = p: iit or yo iiô.ie co% ol; e C48JE. ò #, == ée, SU2-van. \ 'the case a s:> 5.122.; ... i ë: msâs = .m "5, o é =" v = -i lisa' :. hydrophilic colloidal and an adjimi? aJt of i # ouching., such as sapoRin ..

   The deposition proe-adê of these strains is well known pt e = outside 1? In "- #" ùiJ? A IÀ is advanëageis: that the ..fd of the ngrÉ-e3dîents ec'rspc'sitlon deposited conëienaSp in plus l.ngred.JLel1S enu> 4r.4s ce> .-, à> rsixs ua ce # ;;:; = daoei: posr 'qàe 7e cc-lc'yaR ae can not mµ, gie # ?: ta # #s the p311pai-li cases, it is avamous a; 'ajol15; el "; sn? gé: 1; 1 g11 .u: i = ##; e the liana will stick i- #' aaniers that the <ùoi # : = iie ffliZl; zm'c k *. x = * sià e remains intact an? -le p - = <. di # 1 <; pl # o'ùc .. <= - = é = ph = q ## s pendaaë r2: 't sprès sJ> rsitaeE'ë ehà.i #. ±: j = u-to Bit s - "' es'6 necessary we adjust] pH to x:

   the exposure deposit e * m¯patilJi * value at the photosensitive t18eaù2sion layer, e; z operating from known salt shakerso The proportions of colloldal binder dye of taEmast agent morieante and-, coating aid in the composi- The lengths used for the filter layers may vary considerably and depend on the characteristics of the product that we have prepared, ioas mojF '# ns "deterwirzer the. n" -1 optimum preferably ", arer. t.es mOJ! 'ens i1Jea erm.ù1e!' .l \ .t:!, cO: ':: Q; s :! "' CpiGJ.ITiaa.;:; are well onm, 5 and. > ii: à-3hcrs d 1? invevfl; laY # <La. ccuche pJxi ## sessib3. * om les eouoùl.i = s àJhotmsansi? ier and coM-he abs * z "DJ> is.2 2a lusiere das p # = oéàµ.1: c''6ogr <=. pbiqKes :: 'V1i =' sB.'ë cil gia? av <i = t el: ri d1) $ 9 $ SZ '' 2 ;; '. u i3 -LO c, r- ixal it = m <123, c- - 3 ''.: T: ml = ilL ± 16> poi;

    preçx + e of the products> iuit pe? afsj:: j4iiqueā; your Ljuiane

 <Desc / Clms Page number 15>

 
 EMI15.1
 1 -..- -..- .i ...: ....-
 EMI15.2
 film of cellulose nitrate, cellulose acetate, synthetic resin, or such as a sheet of paper, or metal or such as a glass plate, for example.



  The hydrophilic colloidal materials which can be used as binders which are combined with the dyes defined above to form
 EMI15.3
 the filter layers of the new photographic products include gelatin, colld..ion, arabic go; me of cellulose derivatives with an ester or dathe "9 structure such as alkyl esters of cellulose carboJléep hydroxyethylcellulose² 3 1 'yy '- .. v -pp; q; #n'. wL.CG ..; '.' ¯ '. la ca ± bo:;:; rI?;: H3thylhyr1roJ: yethylcell111ose! J o still? i4; 3 -nes .s:; TI '; 11etiql1E; s:; - :: ellBS that the copolysers 8El9ho- =::' :: S're3 dci'js au os, etr'1 'from the United States il 2 = 949.44 L.JaLCOOJ1 p'i'ly '"1.> µ'fi.iQ'a ± aù2 + eS Lakoi4C'iS X3akG ± Ôaes Conn & eS des S] 3Ôoôia3.istesr p-ly'i"; ylqu.e August 6: ? Balères talcg: .1es ccanues des s!; Ecial5..s'Z: esc-.,., -: W9 o: * cl ': ere.8 G1 :: -;,;: U3 !: ";

   above include Cr.:l8e CCoi1cèZ "GS, 'i!., p.; i: l: .¯: -. Z".? '-Se' :: W3 .. x '' .. :: .. <t - ': .. t- = 1': 1 \, p - ';: Ü 6tJ Uti salt d ufi eoEpcse of fc'rnl .2.:, = Ty ..; - = t..2.? Ir: ..: 3J. qU "? m sel d? a5yÀEmiô2fp e, p {f7Î -.- '':" Ëgfly these # ± lô ± j ± -t. "". 7 "'"': '' '' '; , ::. n atose.? 'h1.1.-1 [.? n dÎ! 1 "J' 1ii'i'1 gyfiJope r: tf,} '1: .. e :. they peùvénl.>' ïvfr: .¯ ' PH: a ..: zs3i Us, aâe, S..FL..g.'v '.: 3' .e: ad .. :: îsm: "f ',:", - :; "' - ' , "11r f'i: Jft1 '-";' - could "J <4r -! 'Y.ç ::. 1.' '\ L' = 1.M '! I' \ f, 20/100 de 1t "'F';. 1, -: .-, <1: -" :, 11 '... if'i' ', :: çl) O ::' :: S6a This tp0isièros ü'gzs4 does must contain Ri gro'xpG br..3i: 1t [, 11 #: ", cÍJ..Eße aside and can G'Î; L" i] D eg 7? aeôta; 2nd of vinyl. le - ::: àl ':;?' 2: re ds riùyle9,., 3: '. e? le métl'1a (: rJ? loni - = - "" 7 s <ai Aizes = aux a = ## 3? late i = m z4% iacrjri? l; ea =) 1.a> help 1; j <ile "the S; / KG [1 :; 2 :::

   é- .. ô "çp âiç 'an # ed1acrYJaaJ; es ¯" "l" a: ü.Qle).:. G mtl1.acr'; "la" TIiJetJ L "2 - :, C Examples of such pclr3 .res 5yntl1tiques j..v: ¯1 "; # .ù: 2-:: 2. ; f :: - =.: '::; 3'J ;. ? - = I r: 269G: ---: ±; s ..: .-: ",>, P2.1: Lt: '; 3: J?: I 1." azià * & thcrli $ ± <s te? Jlyères. dgell! 2Ei 1- "saths.cryliq acid ..: les' erps'iy'aeres.! ïellyl, a3i <.:. i" 44aG: ¯w iiî y71igaù * -: c.9B ± J / l:; r .tie the products: x. "Nâ: '# S; ses', F" .. F'4â .: ':.'. m ClaL.:;.'--CG;.-a:ue.9 '' 2 aCJlGe r.2t: C.h.ClqYkJ..que e2 daee'6? - '% e à Si'? iYß'.t '. 3, s '.La'. 'R.s? Ir': â ú1lyla :: rtnet- acrylic diacid and styre6 d2ylideft methac acid copolymers, lique Gt copolymers d-allylsaide diacid sethaslic acr-; ion.t e, etc.



  To prepare the filter coatings of the photographic products followed by the invention, the dye to the colloidal binder permeable to water in solution in the water is generally added. Dosas in certain cases it may be advantageous of faith == - 3r VJT alkali metal salt of the dye by dissolving this color in a dilute aqueous solution of metal carbonate. sicalim. (; e. '. 1 \ éz: ale :: r: entp 1) adds an adjuvant of Ca "3.3: 2'-. 6th the saponin psr' a'û2 .. to the 54 ^ Yf f'IG C ' : de colr dli1 t'c.vÀa a7 de â oW .. le aeEpvs1ti; stU 'the support pO "o'lX" f07: me; ".2rte c" .9m'ba: filtering 12 J: .. llii1 :! Gl'e ",

 <Desc / Clms Page number 16>

 
 EMI16.1
 The medium zn dye of the mordant is advantageous.
 EMI16.2
 suitable basic which is added to the colloidal suspension before
 EMI16.3
 to drop it to force uae ccucha.



  The cords that an can use for this purpose and co :: p: re: .11ent: 5 the nordants written in the Et & ts-Ssis patent o 2..332¯156, p = éç-a-. res by condensation cP ca;: p,.: se oxo p ;;) ly "i .., ;; 1.iue such as polyacroleine, a poly-stsylacroléise 'uses psiyvinyl-alcoyicétoseiëH.e as 2-a pJl = Jvmj, 1-é-y7eeton% ketone, polyTinyl-butylcetcse etc. ', ûu .ie 0 certain polysers contained and due to the r <etl- # ac;

  oléGe or a $ oiyw> yTa1coyicétJne, such as above, this oxo polyvinyl condose being, by art cop17ère in proportion é-1 =? TéculL * ire â 'of the compounds defined above with the styreae or with a ret. 'HiCr.1late alkylate in which the alkyl chain contains one to four atoms of' -Ci as the nethacrylate of 8t .. '1yl'37 due prapyla or d-moon leaves, with an added derivative of guangin, such as bicarbonate daBijjQOguanidine acetate dsinoguanidise dsino butyrate (guasidin, etc., the mass ratio of the oxo polyvinyl compound) and of the derivative to 'xinocup-Jidine was between 0.25: 1 and 5: 1 ; the reaction products of polyvinyl sulfonates with C - ir-Lnop; .riàL-1es described in these patent no 2,768,078, prepared by making polyvinylsulfonates da1coyl or
 EMI16.4
 aryl, prepared as described in ;:

   united states patents
 EMI16.5
 nos 2.531.46. to and 2.531..469 with C-inopyriJs, optionally: substituted by a group? lc <:) y1.e; under carefully regulated conditions the C-aiaopyridies usable being noted the 2-; x; .inopyridine, the i-, inopyr.iàhne, the: dr:. ::; lc'J1in <:: s, paî "example la 2 -aamino-3 - n-éthylpyriàfz-ie, la 2-x # OE? -ly-m = ELi: 3.lpà. = - iàine, 1-i 2-anLno-5-màti?;. lpy.ridîne , Tzà 2-aninc-5 = zà4tlayl.g>% = 1 = ii; e and analogous derivatives bearing in position a sinoHethylej suL-stituant. Which react exactly and with the maznsaicre the. 2-Jm% nxS-6thyipyridine, the 2-a = ino-6-bstylpyrldie, la and, various inotluidins such as q ;, for example 2-sBino-3-ethyl-4-methylbendne, etc .;

   alalc * #. 'l - == minoalcoyliq # e3 esters of dialkylaminoalkyl, ..-- ides ,, such as described in United States Patent No. 2,675316 which was prepared by reaction of
 EMI16.6
 addition polymers containing groups with a compound
 EMI16.7
 laid down basic dizlcoy'xniné, such as, for example, the N-d1alkyleninoethylpxes esters of polysers or of capolymers containing

 <Desc / Clms Page number 17>

 carboxyl groups; and addition polymers containing units comprising quaternary groups, as described in
 EMI17.1
 United States Patent 2,548,564 which CDI: 1 takes, notaz = 1ent, quaternary aoaonios salts of grct-substituted asins.



  5 vinyl pes, such as' vinyipyridine and its homologues, for example vinylquisoleine, ¯ Ti'3, .Cr.'t.tï '...; i, and derivatives 3- -,.' T'ï? nucleus e5: - six-membered h6-terocyclic containing atoses dhydroel-ne, such as po3ypm # atouèneszi fonate from 2-: thyT.-.



  2- (or -4 - :) vinylp: rldbiun}, etc ...



  0 The which garlic can be added to the compositions used to prepare the new light filtering layers are the various customary tanning agents, such as formaldehyde, aliphatic acids substituted by halogen, for example.
 EMI17.2
 example the acid ra = cob1-or = iqme, described in United States Patent No. 2,059,019, such as compounds containing more than one anhydrous acid groups, for example 7,8-diphenes> ljicyclo-2 dianhydride ,, -2-octne-, 3, s ç-;

   trGear'o e i.çue, or also such as a dicabo) J1ic or disulfonic acid chloride, for example terephthalene chloride or naphthalene-ï, 5-3isul ¯) fonyl chloride, pod described in the patents of the United States n 2.725.294 and
2,725,295, or as a 1,2-cyclic au-lime diketone, for example
 EMI17.3
 the cyclops;

  zne-1,2-aione, coase described in United States Patent No. 2,725,305, or alternatively such as a Qethanesulfonic acid biester, for example 1,? - al (neUaanesionoz3.) - etha + eu, cornie described to United States Patent No. 2,726,316, or as a daldehyde or a bisulfite combination derived from a dialdehyde, the two aldehyde groups being separated by two or three atoms of
 EMI17.4
 carbon, for example p-mBthyl-glutaraldehyde-bis (soy bisulfite), or alternatively such as i., 3-d, i3yc3.ro.y # thylbenz-idazoLyl-2i one, as described in the United States patent. United States No. 2,732,316, or also such as a bis-aziridine-carboxaside, for example trisethylenebis (1-aziridl-carboxide), as described in United States patent No. 2,950,197, or alternatively such as 2,

  3-dihydroxydioxane, as described in U.S. Patent No. 2,870,013.



   Photographic elements comprising the new filter layers may include photosensitive emulsion layers containing silver chloride, silver bromide, silver chloroborur, silver iodide, silver bromoiodide. silver, silver chlorobromoiodide, etc., as a photosensitive material. These silver halide emulsions can be

 <Desc / Clms Page number 18>

 sensitized by all usual sensitizers, in order to have the sensitometric characteristics required for the use for which the photographic product is intended.



   The dyes defined above make it possible to prepare
5 filter layers used in photographic materials containing a layer. photosensitive silver halide emulsion. These filtering layers containing the said dyes can, depending on the needs, be deposited on the photosensitive layers, between those layers on the LO support and under. photo sensitive diapers or forcing an antihalation back layer.



   The following examples illustrate the invention.



   EXAMPLE 1. -
A solution of dye 12 from the list is added. 5 precedes in a mixture of dimethylformamide and methyl alcohol in an aqueous solution of gelatin. It is stirred to ensure perfect homogenization of the composition, then the latter is deposited on a support film to force a layer containing per square decimetre, 32 mg of gelatin and 26 mg of colourant. A usual photographic silver halide emulsion is then deposited on the light filtering layer thus formed.



     After drying, the photographic material is exposed and developed, fixed, washed and dried in the usual manner. It can be seen that a ± 4-ne is obtained, not containing any residue stain) of dye in the areas forming the background of the plate. In this example, the dye was discolored by light energy absorbed during exposure. If the test is repeated, omitting the color, a blurred image is obtained due to the absence of a protective filter layer.



   EXAMPLE 2. -
The procedure is analogous to Example 1, but dye 3 and a photographic emulsion, of the type described in Example 13 of United States Patent No. 3,447,927, intended for a method of preparation, are used. draft by stabilization, and it is treated by such a method. We still get good reproduction. In this example, the discoloration is produced by both light energy and heat energy.



  EXAMPLE 3. -
An invertible photographic element for subtractive color photography is prepared in the manner

 <Desc / Clms Page number 19>

 usual, * using as a filter layer placed between the layers
 EMI19.1
 d-lémil-lsîon a layer conforms to the above definition.



  On a film support of cellulose acetate, a layer of gelatin-b! "O!; Iodide silver iodide sensitized with red and containing a red-sensitized silver iodide is deposited in order. blue-green-forming coupler, of one of the types described in the patents these States
 EMI19.2
 United z 2.433. ? or n 2.4231% 3à. ,Sure. this red-sensitive layer, a layer ssis3Lble green and containing coupler -fcrsateur of this ox 2a <'"ge.nta: t by .ep? s9 the type described) is deposited in United States Patent No. 2,600,733.

   On the green sensitive layer, we. remove the new filter layer, which contains, for example
 EMI19.3
 square decimetre, 16 mg of g-Ë1.Gcti.ne, bzz mg of yellow dye s 26 from the given list i3 :: c.e''2a :: r and 6.5 mg t9tli1 copolymer of styrene and; - di é .x = - .: cpp? acr; Ia., ide .. A layer of gel.aīo-bro is deposited on the filter layer: oioure charge O; ::: 1sible gu blue a coupler: fo ::: ":: 1ator of c01or2. Yellow, for example of the type described in United States Patent No. 2,375,057.



   The photographic product is exposed as follows: formed in a
 EMI19.4
 p'oorapiuea aas apparatus is treated by chroKogene development with inversion according to the method "kodak Ektachrome E-2 1. A positive sorting is obtained having a good color rendering without any trace of the yellow filter layer, which has been discolored.



   A similar result is obtained by using dyes 3, 4, 5 or 19 to form the filter layer ;, instead of dye 26.


    

Claims (1)

CLAIMS 1. A photographic element comprising a support having at least one photosensitive layer and one light absorbing layer, characterized in that said light absorbing layer contains at least one compound of formula EMI20.1 in which: R1 denotes a methine bond terminated by a heterocyclic ring. of the type contained in cyanine dyes and advantageously containing five or six chalnons, an alkyl, anilinovinyl, aryl, styryl, or aldehyde radical or a hydrogen atom, R8 denotes a methine bond terminated by a heterocyclic ring of the type contained in the dyes merocyanine or an allylidene radical, R denotes an alkyl radical, optionally substituted or acyl, X denotes an anion and Z represents the set of non-metallic atoms necessary to complete a five- or six-membered heterocyclic ring. 2.- Photographic product according to claim 1, characterized in that said compound corresponds to one of the following formulas: EMI20.2 <Desc / Clms Page number 21> EMI21.1 ) in which Q1, Q2, Q, Q4, Q and Q each represent the non-metallic atoms necessary to complete a 5- or 6-membered heterocyclic ring, R represents an alkyl radical, optionally substituted, or acyl, R2, R4 and J each an alkyl or aryl radical or a hydrogen atom, L a methine bond, EMI21.2 1 X eeî --- D3 ........ on-l.-a. "1.,. 1I'nvl ,," alkenyl, a1-yl 1 alkoxy; t X via 0:. & 4 .., 1 .. &, E "an alkyl alkenyl, aryl or alkoxy radical, D - and E each a hydrogen atom, had an alkyl or aryl radical, R5 an alkyleneoxy radical containing from 1 to 8 carbon atoms, R6 and R7 each a cyano radical, g is equal to 1 or 2, m is a number from 1 to 4 and n is a number from 1 to 3.- Photographic product according to claim 1, characterized in that Z denotes a pyridine, quinoline or indole nucleus. 4. A photographic element according to claim 1, characterized in that R1 is a methine bond terminated by a five- or six-membered heterocyclic ring containing au. minus one intranuclear nitrogen atom. 5. - Photographic product according to any one of the preceding claims, characterized in that said light absorbing layer is an antihalation layer deposited directly on the photographic support, or under a layer. <Desc / Clms Page number 22> the emulsion, or in the dorsal layer. 6. - .photographic product according to any one of the preceding claims, characterized in that said: light absorbing ouche is a layer deposited on at least me photosensitive layer, so that this photosensitive layer e is not impressed by the radiation absorbed by the light absorbing layer lite. 7. A photographic element according to claim 6; characterized in that it comprises the following layers, from the support: a red sensitive layer a green sensitive layer a layer containing a yellow light absorbing dye u type defined in claims 1 to 4 t a blue sensitive layer.