DE1597877B2 - ELECTROPHOTOGRAPHIC RECORDING MATERIAL - Google Patents

Description

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The invention relates to an electrophotographic recording material, in particular an optical disc for the xerography.

It is known that certain photoconductive substances can be deposited on the surface by electrostatic processes Images are generated and developed. The basic electrophotographic process, such as it is described in U.S. Patent 22 97 691 is that a photoconductive layer is uniform charged and then with a chiaroscuro picture is exposed, as a result of which the charge is diverted in the exposed areas of the layer. The distribution of the electrostatic latent image formed on the layer corresponds to the light-dark image. Furthermore, an electrostatic latent image can be formed on the plate by imagewise charging will. In both cases the image is made visible by the deposition of a finely divided developer, which consists of a dye, the so-called toner, and a carrier for the toner. Of the Powdered developer is attracted to the areas of the layer that carry a charge, thereby causing a powder image corresponding to the latent electrostatic image results. This powder image can then transferred to paper or other image carriers. It can then be applied to the paper by heating or another suitable fixing method can be permanently fixed. This general procedure is also described in U.S. Patents 2,357,809, 2,891,011, and 3,079,342.

Numerous photoconductors, such as anthracene, sulfur and selenium, are suitable for the production of xerography plates or their mixtures; see U.S. Patents 22 97 691 and 29 70 906. These photoconductors are generally sensitive and excel in the blue or near ultraviolet region The exception to selenium is that they are only slightly sensitive to light. Selenium was made because of its larger size Sensitivity is the most widely used material commercially for xerographic plates. Glass-shaped While selenium is beneficial in many ways for this purpose, it has the disadvantage that its sensitivity is largely limited to the ultraviolet, blue, and green regions of the spectrum. These limited color sensitivity makes it difficult to make copies, especially those of red-black, blue-yellow or blue-orange colored originals are to be produced.

If the selenium-containing layer is applied to a conductive layer support, then it is a barrier layer required between the selenium-containing layer and the substrate. The reasons for this are detailed in U.S. Patent 29 01 348. As is apparent from this patent, the barrier layer must be non-conductive in the dark to prevent the passage of electrodes from the conductive substrate in the photoconductive layer and thus a loss of charge in this layer during the period between the uniform charging and the exposure to the image to be copied. is On the other hand, the barrier layer in light is a good dielectric, so it can fully discharge the exposed Prevent areas during exposure. This will prevent the build up of toner in the Background areas reinforced during development. The selection of fabrics for the barrier layer as well as their strength therefore necessarily lead to an intermediate state between high resistance in the non-exposed areas and low resistance in the exposed areas.

Xerographic plates with a selenium-containing photoconductive layer are often distinguished poor adhesion to the substrate. Differences in thermal expansion between the carrier and the photoconductive layer cause cracking and peeling of the photoconductive ones Layer. The xerography plate is used in commercially available copier machines with large temperature differences between being cold when the machine is switched off and the unavoidable exposure to heat through proximity exposed to the heat fixing device in the operating state. The problems of adhesion are even greater, when the photoconductive layer is located as a coating on a flexible belt that is guided on rollers is. The constant flexing of the photoconductive layer often leads to cracking and peeling Document. If there is a barrier layer, additional problems arise as this occurs during the bending stress must adhere well to the substrate and the selenium-containing layer. The selection more adherent Materials for the barrier layer is in the dark and by requiring good insulating properties Not too pronounced insulating properties made difficult during exposure.

From the German Auslegeschrift 11 69 292 is a electrophotographic? Recording material known that between a support and a photoconductive layer a layer made of an elec-

Trically insulating binder and fluorescent compounds dispersed therein. It should the spectral emission of the fluorescent compound with the absorption maximum of the photoconductive Layer coincide. This layer structure of the recording material is suitable for the inherently low spectral sensitivity of photoconductive zinc oxide layers to improve the above However, the described difficulties with selenium-containing photoconductive layers can be applied to this Way not fix.

The object of the invention is therefore to provide electrophotographic recording materials, their Photosensitivity covers the entire visible spectrum. Furthermore, the recording material should Have a barrier layer that is a very good dielectric in the dark and when exposed to visible Light is a less good insulator and vis-à-vis both the photoconductive layer and the Layer support has good adhesion.

According to the invention, an electrophotographic recording material is suitable for achieving this object from an electrically conductive layer support, an intermediate layer with an insulating binder and a pigment and a photoconductive layer characterized in that it is Pigment contains a phthalocyanine and a layer containing selenium as the photoconductive layer.

The recording material has a panchromatic sensitivity spectrum, since the selenium-containing While the layer is primarily sensitive to light in the blue, green, and ultraviolet regions Phthalocyanine-containing intermediate layer primarily in the red and near infrared regions of the spectrum appeals to. The intermediate layer containing the phthalocyanine in a binder acts as an astonishingly good one Barrier layer against the passage of electrons from metallic substrates. The intermediate layer is in the dark a very good dielectric that prevents dark decay and aging. In the Exposure, however, the exposed areas of the intermediate layer are changed in such a way that they become charged from the metallic substrate into the selenium-containing layer and thus a practically complete, enable rapid discharge of the selenium-containing layer in the exposed areas. There no If the residual charge remains in the exposed areas, there is very little toner in the background areas deposited so that a clean, high-contrast image is created. The intermediate layer can be sufficient strongly designed to act as a barrier during the period between the electrostatic Charging and exposure to work, but without affecting the discharge during exposure. The binder resin for the phthalocyanine is preferably selected so that there is an optimal one Adhesion between the selenium-containing layer and the substrate results. The binder must Be insulating, however, the other properties and strength can be in terms of optimal Adhesion can be selected without regard to optimal barrier properties, since there is still the phthalocyanine is available.

The conductive layer support can consist of any materials that are used as a counter electrode for the xerographic plate act. Suitable materials are e.g. B. Metals such as aluminum, brass, stainless steel, Copper, nickel and zinc. Furthermore, glass can be used which is coated with a conductive coating of tin oxide, Indium oxide or aluminum is provided. Similar coatings can be applied to plastic substrates will. Furthermore, paper can be made by incorporating a suitable compound or by Moistening must be provided with a water content sufficient to achieve conductivity.

The selenium-containing layer can be composed of selenium or a suitable selenium alloy or mixtures of others Substances with selenium exist. Typical selenium alloys or mixtures containing selenium are cadmium selenide, Cadmium sulfoselenide, mixtures of sulfur and selenium, such as are found e.g. B. U.S. Patent 22 97 691 are described, mixtures of arsenic and selenium, as they are, for. B. in U.S. Pat. No. 2,822,300 are, mixtures of selenium and tellurium, as they are e.g. B. in U.S. Patent 28 03 541 described are, arsenic selenide, tellurium selenide and their mixtures.

The selenium-containing layer can contain various sensitizers, for example those in German Offenlegungsschrift 15 22 711 described halogen additives. The selenium-containing layer can be any suitable Have strength. However, the thickness is preferably 5 to 50 μ for optimal sensitivity, thermal and to achieve mechanical properties and permeability in the red spectral range.

The intermediate layer contains a suitable phthalocyanine dispersed in an insulating binder. The polymorphs produce the greatest sensitivity to light together with the lowest dark discharge crystalline α- and Jf-forms of metal-free phthalocyanine, therefore these shapes are preferred. The polymorphic A "form of metal-free Phthalocyanine is described in German Offenlegungsschrift 16 19 654. Any other metalliferous or metal-free, substituted or unsubstituted, monomeric or polymeric phthalocyanine can also be used will. Typical phthalocyanines are aluminum phthalocyanine, aluminum polychlorophthalocyanine, Antimony phthalocyanine, barium phthalocyanine, beryllium phthalocyanine, cadmium hexadecachlorphthalocyanine, Cadmium phthalocyanine, calcium phthalocyanine, cerium phthalocyanine, chromium phthalocyanine, Cobalt phthalocyanine, cobalt chlorophthalocyanine, copper-4-aminophthalocyanine, copper bromochlorophthalocyanine, Copper-chlorophthalocyanine, copper-4-nitrophthalocyanine, copper phthalocyanine, Copper phthalocyanine sulfonate, copper polychlorophthalocyanine, deuterium phthalocyanine, dysprosium phthalocyanine, Erbium phthalocyanine, europium phthalocyanine, gadolinium phthalocyanine, gallium phthalocyanine, Germanium phthalocyanine, hafnium phthalocyanine, halogen-substituted phthalocyanine, Holmium phthalocyanine, indium phthalocyanine, iron phthalocyanine, iron polyhalophthalocyanine, lanthanum phthalocyanine, Lead phthalocyanine, lead polychlorophthalocyanine, cobalt hexaphenylphthalocyanine,

Copper pentaphenyl phthalocyanine, lithium phthalocyanine, lutetium phthalocyanine, magnesium phthalocyanine, Manganese phthalocyanine, mercury phthalocyanine, molybdenum phthalocyanine, naphthalocyanine, neodymphthalocyanine, Nickel phthalocyanine, nickel polyhalophthalocyanine, Osmium phthalocyanine, palladium phthalocyanine, palladium chlorophthalocyanine, Alkoxyphthalocyanine, alkylaminophthalocyanine, alkyl mercaptophthalocyanine, Aralkylaminophthalocyanin, Aryloxyphthalocyanin, Arylmercaptophthalocy-

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anine, copper phthalocyanine piperidine, cycloalkylamino resins, silicone resins, epoxy and epoxyphenol resins,

phthalocyanine, dialkylaminophthalocyanine, diaral polyvinyl carbazole and polyester. Optimal adhesion

kylaminophthalocyanine, Dicycloalkylaminophthalo- on the layer support and the overlying selenium

cyanine, hexadecahydrophthalocyanine, imidomethyl-containing layer and an extraordinary light

phthalocyanine, 1,2-naphthalocyanine, 2,3-naphthalo- 5 sensitivity are achieved with polycarbonate resins.

cyanine, octaazophthalocyanine, sulfur phthalocyanine ranges. That's why these are used as binders for the

anine, tetraazophthalocyanine, tetra-4-acetylamino-phthalocyanine preferred in the intermediate layer,

phthalocyanine, Tetra-4-aminobenzoyIphthalocyanin, The pigment-binder-solvent-slurry

Tetra-4-aminophthalocyanine, carbon tetrachloride phthalocyanine (or the pigment-binder melt) can

locyanine, tetradiazophthalocyanine, tetra-4,4-dim- io on the support according to one of the known over-

thyloctaazaphthalocyanine, tetra-4,5-diphenylenedizugsverfahren be applied. These include

oxide-phthalocyanine, tetra ^ S-diphenyloctaazaphtha- spraying, pouring, brushing, electrostatic over-

locyanin, tetra- (6-methylbenzthiazoyl) phthalocyanine, pulling, dipping, rolling, etc. After the resin is in

Tetra-p-methylphenylaminophthalocyanine, tetrame- the intermediate layer is cured, the selenium can

thylphthalocyanine, tetra-naphthotriazolylphthalocy- 15 containing layer can be applied in a suitable manner

anine, tetra-4-naphthylphthalocyanine, tetra-4-nitro- den. For this purpose, vacuum deposition is preferably

phthalocyanine, tetra-perinaphthylene-4,5-octaazofung used, because it is smooth, even

phthalocyanine, tetra-2,3-phenylene oxide-phthalocyanine, layer in the amorphous state is formed.

Tetra-4-phenyloctaazaphthalocyanine, tetra-phenyl- The invention is further based on the drawing

phthalocyanine, tetraphenylphthalocyanine tetracarbon- 30 explains the sensitivity curves according to the

acid, tetraphenylphthalocyanine tetrabarium carboxy invention compared to the

lat, tetraphenylphthalocyanine tetracalcium carboxylate, shows sensitivity curves of known plates.

Tetrapyridylphthalocyanine, Tetra-4-trifluoromethylmer- In the figure are sensitivity curves for two

captophthalocyanine, tetra-4-trifluoromethylphthalocy- various plates shown. Is on the abscissa

anin, 4,5-thionaphthenoctaazophthalocyanine, platinum- 25 which appear on the plate at a given time

phthalocyanine, potassium phthalocyanine, rhodium phthalocyanine applied voltage. The ordinate is the

locyanin, samarium phthalocyanine, silver phthalocyanine- scale for the after charging of the plate

anine, silicon phthalocyanine, sodium phthalocyanine, running time in seconds. Each plate is

sulfonated phthalocyanine, thorium phthalocyanine, none charged to a certain initial voltage.

Thulium phthalocyanine, tin chlorophthalocyanine.Tin 30 Then each plate is covered with either red or white

phthalocyanine, titanium phthalocyanine, uranium phthalocyanine- exposed to light, causing a rapid drop in charge

anine, vanadium phthalocyanine, ytterbium thaiocy- occurs in the photoconductive layer. That on the

anin, zinc chlorophthalocyanine, zinc phthalocyanine and plate remaining potential is each with a

Mixtures, dimers, trimers, oligomers, polymers, vibrating blade electrometer with transparent probe

Copolymers or mixed structures of these phthalo 35 measured. Special details of manufacture and

cyanine. Examination of the panels are in Example 1 below

The phthalocyanine can be given in finely powdered form. Curve A applies to a selenium plate without

be dispersed in the binder. The weight ratio intermediate layer that was exposed to red light,

As can be seen, this plate has no red tem-

usually carries about 2: 1 to 1:15, preferably 40 sensitivity. Curve B applies to the exposure of a

about 1: 4 to 1:10. The phthalocyanine is in the selenium plate without an intermediate layer with white light,

dissolved or molten binder on suitable This plate has good photosensitivity, shows

Wise dispersed, for example by application but a certain charge retention for a few seconds

strong shear forces and preferably simultaneous after exposure. Curves C and D apply to

Grind. This is made by grinding in ball mills 45 a selenium plate with an intermediate layer of in

Roller mills, sand mills, high speed a binder dispersed phthalocyanine, the

mixing, ultrasound treatment or a suitable exposure to red or white light.

Combination of these methods achieved. In addition to this plate is opposite to both red as well

Incorporation of the phthalocyanine particles in the dissolved white light is very sensitive. Like out of the curves

or melted binders, they can also be recognized by the 50, the phthalocyanine-containing intermediate

dry or slurried powdery tine layer is more sensitive to it

demittel can be added before this to film formation after red light and a lower residual voltage

heated or dissolved. the exposure. In addition, this improves in the

The phthalocyanine-containing layer can have any suitable intermediate layer containing resin, the adhesion of the nete strength. Excellent results are achieved with selenium on the substrate, as in the following ones with thicknesses of up to about 5 μ. For an example it will be described. The intermediate optimal sensitivity of the entire photoconductive layer consisting of a phthalate-capable layer dispersed in a binder and a good barrier effect should be the locyanin has better properties than an intermediate binding layer a thickness of about 0.5 to 1 μ medium-free layer, since the binder has the adhesion. ^6o between the substrate and the selenium-containing one

The binder for the phthalocyanine in the layer is greatly improved. Furthermore, due to the single intermediate layer, the empire film-forming organic resin can consist of any suitable insulating layer of a non-conductive binder. Preferability improved, because the binding agent is supposed to do that!? ^: "The agent enables good adhesion to the generation of an electric field and thus ^{promotes the selenium or selenium-containing mixtures as well as the conductive 6} 5 charge carrier injection into the selenium,
have capable support. Typical Insulating The following examples illustrate the invention. Film-forming binders are urea and metal binders in more detail. All parts and percentages relate to the amine-aldehyde resin, polyimide resin, polycarbonate weight, unless otherwise stated.

example 1

Two optical disks are made as follows:

a) A 0.13 mm thick aluminum sheet is, as described in US Pat. No. 29 70 906, coated with a 50 μ thick layer of amorphous selenium by vacuum deposition.

b) A coating solution is prepared by dissolving 2 parts of a polycarbonate resin in 10 parts of dioxane and 10 parts of dichloromethane. 0.3 part of the A 'form of metal-free phthalocyanine is added to this solution. The solution is then poured onto an aluminum support up to a dry layer thickness of about 0.5 μ. The resin is partially cured for 5 hours at about 100 ^° C. "A 50 μm is then applied to this intermediate layer. thick layer of amorphous selenium applied by vacuum evaporation.

Each plate is then electrostatically charged. For this purpose, it is passed three times past a corona discharge unit operated at 6000 volts, as described in US Pat. No. 2,588,699. Each plate is then exposed by means of a tungsten-quartz iodine lamp with a color temperature of about 2800 ⁰ K white light. The photo-induced discharge of each plate is continuously measured with a vibrating blade electrometer with a transparent probe. The results are shown in the drawing. Curve B shows the sensitivity of the selenium plate without an intermediate layer, while curve D shows the sensitivity of the selenium plate with an intermediate layer. Each plate is then charged again to a positive voltage and exposed to red light using a filter between the light source and the plate. The filter lets through about 87% of the visible light with a wavelength above 630 πιμ, but <1% with a wavelength below 580 πιμ. The sensitivity of each plate to "red light" is measured and shown in the drawing. Curve A applies to the selenium plate without an intermediate layer, while curve C shows the sensitivity of the selenium plate with an intermediate layer of phthalocyanine and binder. As can be seen from the curves is, the plates with the interlayer are more sensitive, especially to red light, 'and have a lower residual charge after exposure.

Example 2

Two optical disks are made as follows:

a) A 30 μ thick layer of amorphous selenium is applied to a 0.05 mm thick brass foil applied.

b) A coating solution is prepared by mixing 4 parts of a polycarbonate resin in 20 parts Toluene dissolves. 1 part of the α-form of metal-free phthalocyanine is added to 10 parts of this solution given. A 0.05 mm thick brass foil is dipped into this mixture Coated to a dry thickness of about 0.6 μ. The resin is then through for an hour Heating to 100 ° C partially hardened. A layer of amorphous selenium is then put through Vacuum evaporation applied to the resin surface up to a thickness of 30 μ.

Each film is then bent with a radius of curvature of 5 cm. The foil with the on the brass surface Directly applied selenium shows cracks in the selenium layer and severe flaking. With The film provided with the phthalocyanine binder layer shows no cracking in the selenium layer and it The coating adheres firmly to the carrier.

Example 3

A coating solution is prepared by dissolving 1 part of a silicone resin in 6 parts of xylene. 0.3 parts of the Χ-Έοττη of metal-free phthalocyanine are added to this solution. The solution is placed on an aluminum support up to a dry

sprayed on with a layer thickness of about 0.8 μ. The plate is then heated ^{to 100 ° C. for about 1 hour.} Then a 40 μ thick layer of amorphous selenium is applied to the resin surface by vacuum evaporation. The plate becomes electrostatic by means of a

^ao corona discharge device, which is fed with a negative voltage of about 6000 V, charged. The plate is then exposed for 10 seconds using a black and white slide using a magnifier with f / 4.5 optics and a tungsten filament

lamp projected onto it with a color temperature of 2950 ° K will. The exposure intensity is about 43 lux. The electrostatic latent image obtained becomes, as in FIG U.S. Patent 26 18 551, developed by cascade development. The obtained PuI-

as in U.S. Patent 25 76 047 described, electrostatically transferred to a sheet of paper. The image obtained on the sheet is good Quality and corresponds to the projected image. The plate is then ready for reuse after loading

written procedures ready.

Example 4

A coating solution is prepared by dissolving 5 parts of an aromatic polyimide resin (solid content 12%) prepared by reacting pyromellitic dianhydride with a diamine in 6 parts of dimethylformamide. 0.1 parts of the A ^ form of metal-free phthalocyanine • 15 are added to this solution. This mixture is then applied to an aluminum plate to a dry layer thickness of about 0.7 μ. The resin is then ^{cured at about 200 °} C. for 1 hour. A 15μ thick layer of amorphous selenium is then applied to the resin surface by vacuum evaporation. The plate is loaded, exposed and developed as in Example 3. The result is a good picture that corresponds to the original picture.

Example 5

A coating solution is prepared by mixing 1 part of a melamine-formaldehyde resin in 10 parts Butanol dissolves. 0.4 parts of the α-form of metal-free phthalocyanine are added to this solution.

⁶ <> This mixture is applied to an aluminum plate up to a dry layer thickness of about 0.6 μ. The resin is cured by heating the plate to about 150 ° C for two hours. A 30μ thick layer of amorphous selenium is then applied to the hardened resin surface by vacuum vapor deposition. The plate is then loaded, exposed and developed as in Example 3. The result is a good quality image that matches the original image.

609 534/295

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. Tree resin dissolves in 10 parts of toluene. To this solution

Example 6 0.25 part of chlorinated copper phthalocyanine is

A coating solution is made by giving. An aluminum plate is made with this mixture

1 part of a urea-formaldehyde resin in a up to a dry layer thickness of about 0.5 μ by a mixture of 5 parts of xylene and 5 parts of butanol 5 coated. A layer about 40 μ thick triggers. To this solution, 0.15 part of the α-form 90% selenium and 10% tellurium is then added to the resin of metal-free phthalocyanine. An aluminum surface is applied. The plate is then as in miniumplatte is loaded with this mixture up to an example 3, exposed and developed. The result is a dry layer thickness of about 1 μ coated. The one image of good quality that corresponds to the original image plate is then ^{heated to 150 °} C. for 1 h to get the resin io.

to harden. A layer of selenium about 40 μ thick.

is applied as a coating. The plate exampleU

is then charged, exposed and removed as in Example 3. A coating solution is prepared by

wraps. The result is a good picture that resembles the original 2 parts of a polycarbonate resin in 10 parts of dioxane

picture corresponds. Dissolves 15 and 10 parts of dichloromethane. To this solution

-I ₇ 0.3 parts of the finely divided α-form of metal

given play / free phthalocyanine. An aluminum plate

A coating solution is made by applying this mixture to a dry layer

70 parts of an epoxy resin in 80 parts of ethylene glycol thickness of about 0.5 μ coated by pouring. One

monoethyl ether dissolves. To this solution, 40 parts of 20 about 40 μ thick layer of 90% selenium and 10%

of a phenol-formaldehyde resin and 9 parts of a tellurium is then used as in the US Pat

Given urea-formaldehyde resin. The mixture 27 45 327 described, applied to the resin surface

is then stirred to bring about complete solution. The plate is then loaded as in Example 3,

guarantee. 20 parts of the are exposed and developed for this solution. The result is an image of

X-shape joined by metal-free phthalocyanine. A drawn quality that corresponds to the original image. Aluminum plate is made up to one with this mixture

Dry layer thickness of 0.7 μ covered. The plate . . . .

is heated for 2 h to about 180 ⁰ C to the resins trainees at play 11

harden. Then a 50 μ thick layer of It is as in Example 7, an epoxyphenol over-

amorphous selenium produced by vacuum evaporation on the train solution. With this solution a

Resin surface applied. The plate is then like 0.13 mm thick brass foil to a dry

in Example 3 charged, exposed and developed. It is coated with a layer thickness of about 0.5 μ. The plate

the result is a picture of good quality similar to the original - is ^{heated to about 40 0} C for 5 h to partially remove the resin

picture corresponds. to harden. An approximately 50 μ thick layer of 17%

35 arsenic and 83% selenium is then used in the

Example 8 of U.S. Patent 2822300

A coating solution is prepared by forming on the resin surface. The plate will then

2 parts of a vinyl carbazole polymer in 10 parts are ^{kept at about 120 °} C. for 40 hours to completely remove the resin. Toluene dissolves. 0.2 parts of the cure are added to this solution. The plate is then placed in Jf form of metal-free phthalocyanine as in Example 3. 40 loaded, exposed and developed. An image is created An aluminum plate is made with this solution up to of good quality that corresponds to the original image,
a dry layer thickness of about 0.9 μ coated. The selenium-containing layer and / or the layer of the plate is heated for 1 h to about 8O ⁰ C, to the phthalocyanine and the binder can in vorLösungsmittel to remove. The examples standing on the resin surface contain further additives, a 40μ 45 µm improving, sensitizing, synergistic, strong layer of amorphous selenium is then applied by vacuum vapor deposition. To achieve or otherwise effect. For example, a plate is then charged as in Example 3, and each layer can be exposed to electrical or spectral sensitivity and developed. The result is a good picture that contains the additives as additives. The original invention image corresponds. suitable recording materials are, for example:

50 also for other areas of application in which light-

E xample 9 sensitive layers with a wide sensitivity

A coating solution is made by using spectrum, for example for Vidicon-

2 parts of a glycerol triester of 50% hydrogenated system.

1 sheet of drawings

Claims (7)

Patent claims: 1. Electrophotographic recording material made from an electrically conductive layer support, an intermediate layer with an insulating binder and a pigment and a photoconductive one Layer, characterized in that it is a phthalocyanine and pigment a selenium-containing layer as the photoconductive layer contains. 2. Recording material according to claim 1, characterized in that it is used as phthalocyanine contains the form or the A 'form of metal-free phthalocyanine. 3. Recording material according to claim 1, characterized in that the intermediate layer consists of 2 to 15, preferably 4 to 10 parts by weight of binder per part by weight of phthalocyanine. 4. Recording material according to claim 1, da- ao characterized in that it is one to 5 μm thick, preferably 0.5 to 1 μm thick intermediate layer contains. 5. Recording material according to claim 1, characterized in that it is a binder Contains polycarbonate. 6. Recording material according to claim 1, characterized in that the selenium-containing layer consists of a mixture of selenium and arsenic. 7. Recording material according to claim 1, characterized in that it has a 5 to 10 μΐη contains thick selenium-containing layer.