DE1772270C3 - Method of generating an image - Google Patents

Description

35

The invention relates to a method for generating an image by means of a plate which has a carrier substrate and a layer which can be softened with Contains material in contact with migratory particles, in which a latent electrostatic Image is created on the plate in which the softenable material is exposed to liquid or gaseous solvent or heat is softened so that the particles located in the image or non-image areas of the latent image are selectively migrate to the carrier pad and remove the softenable material and some of the particles through the solvent.

A method of the type mentioned is described in FR-PS 14 66 349. With a typical Embodiment of this known imaging system, the recording material contains an electrical conductive backing covered with a layer of a softenable or dissolvable material, on which a layer of photosensitive wall-able particles is applied Recording material, an image is formed on the photoconductive surface in the following manner first becomes an electrostatic latent image generated, e.g. B. by uniform electrostatic charge and exposure of the surface by a Image corresponding activating electromagnetic radiation. This image is then developed by the The surface of the plate is exposed to a solvent that only dissolves the soluble layer. The photosensitive migratory particles caused by the Radiation that has been exposed will migrate through the softening and dissolving releasable layer. In this way, a negative of the original image remains in the electrically conductive carrier substrate showing image back. This imaging method is known as positive-negative imaging. Using various methods, either positive-positive images or positive-negative images can be produced. What kind of jewelery is made depends on the materials and charge polarities used. Those particles of the photoconductive layer which do not migrate to the electrically conductive carrier layer can be washed off by the solvent together with the detachable layer.

In an imaging system described in FR-PS 15 07 656, an image is generated in that selectively a layer of a distributed material superimposed on an electrostatically deformable layer is discharged. The image carrier arrangement used in this system is essentially the same as that the image carrier assembly used in the imaging system already described above; also with her the charged surface is exposed according to a photograph in order to selectively change the charge and create a developable charge image. The softenable layer is then exposed to heat developed or softened, whereupon the layer consisting of the divided material is selectively dissolved in such a way that the particles are underneath Merge to form an image that is visible through reflected or directly emitted light. If the Image carrier assembly is developed by heat, the photosensitive surface or layer is dissolved, and the photosensitive particles are thereby changing the optical properties of the disk selectively brought closer together The fact that an image is formed in the process is probably due to the fact that the Particles on the top move one after the other and settle in valleys or pockets of the Collect deformation image so that the raised areas of the image are not covered. With regard to this imaging system, it is believed that its functioning is based essentially on a surface partitioning effect with no significant migration of the photosensitive particles within The resulting picture is different from the one above described in that the releasable layer is deformed in conjunction with dividing the photosensitive particles.

In an imaging system described in FR-PS 14 66 349, a non-photoconductive, divided material is used to produce images In this system, a viable image is generated by incorporating an image carrier assembly in a Image configuration is charged by using a mask or stencil. This image will then be in a solvent for the dissolvable material

From DE-AS 11 65 408 a recording mat · rial known with a layer structure that largely corresponds to the material used according to the invention However, this known material is developed according to a completely different process.

In the known recording material, certain photoconductors, such as. B. selenium, more beneficial than other inorganic materials, e.g. B. zinc oxide, too

use. Organic migratory particles, such as those made from phthalocyanine, are not easy to move into make thin layers. In addition, tight tolerances in the particle size of the photosensitive, more hikeable. Particles are adhered to in order to produce good images. So normally a particle size of about 1 μm or less used

The invention is based on the object of improving a method of the type mentioned at the outset in such a way that that a wide variety of migratory particles can be used and at the same time without exception, images of high quality are produced.

In a method according to the invention of the type mentioned, this object is achieved in that a soft material is used, which the Contains particles evenly dispersed and serves as a binder for the particles

As the recording material], in one method According to the invention, a wide variety of the organic and inorganic migratory particles explained in more detail below can be used. The inventive method has the advantage that easily and economically producible recording materials can be used and consistently images of high quality can be generated in which a resolution greater than 200 line pairs per mm can be achieved This results in greater flexibility with regard to the use of photosensitive material and / or binder material that is simply mixed together to produce the softenable layer can be. In this way, they usually need to produce layer images separate coating steps are not carried out.

Implementation examples for the method according to the invention are illustrated in greater detail with reference to the drawings explained

F i g. 1 schematically shows an embodiment of the recording material used.

2 shows schematically a second embodiment of the recording material used.

3 illustrates a charging of the recording material.

4 illustrates a for the purpose of generating a exposure of the charged recording material that occurs in the latent image.

5 illustrates the development of the recording material.

F i g. 6 shows developed recording material.

In Fig. 1 is a typical embodiment of a for Image production recording material for a method according to the invention shown It contains a softenable layer 10 in the form of a plate of eggs A film with a backing 11 which is covered by softenable material 12. Migrant, mostly photosensitive particles 13 are in the softenable layer dispersed substantially homogeneously

The carrier pad or the carrier layer 11 normally consists of an electrically conductive one Material. Typical materials are copper, brass, aluminum, steel, cadmium, silver and gold. the Backing layer can have any shape; it can be designed as a metal strip, metal sheet, metal coil, metal cylinder, metal drum or the like. Provided the electrically conductive carrier layer can be desirable with an insulator, such as paper, glass or a Plastic. An example of this type of carrier layer is a commercially available one, in part translucent glass coated with tin oxide. Another typical carrier layer contains a commercially available polyester layer with a thin, semi-transparent aluminum coating. Another typical backing layer includes polyester coated with copper iodide.

In addition, the carrier layer 11 can also be a be dielectric or non-conductive support. This can be achieved in that a non-conductive support part with an electrically conductive part in Is brought into contact and that charging takes place in accordance with the migration image method described above other methods known in the xerographic art can be used to charge backed photoconductive plates. So z. B. the in F i g. 1 is moved between two corona chargers and simultaneously on both surfaces on opposite sides Potentials were charged.

Any suitable plastic material disclosed in FIG a solvent or by the application of heat is softened and that moreover during the imaging and development cycle has a considerable electrical resistance. Typical materials for this are a partially hydrogenated rosin ester, a hydrogenated rosin triester and a Alkyd resin, silicone resins, sucrose benzoate, a polystyrene olefin copolymer, a hydrogenated, highly branched polyolefin, a copolymer of methyl styrene and Vinyl toluene, polystyrenes. Polystyrene-olefin copolymer, epoxy resins, a phenylmethyl silicone resin Bisphenol-A-epichlorohydrin-epoxy resin, polystyrenes, a phenol-formaldehyde resin, a conventional 80/20 mol% copolymer of styrene and hexyl methacrylate with an intrinsic viscosity of 0.179 dl / gm manufactured fabric.

These materials are intended only as examples of materials used in manufacture the softenable layer are suitable. The softenable layer can be of any suitable thickness.

Thicker layers generally require a higher charge potential than thinner layers. It has it has been shown that in general a thickness of up to 16 μπι delivers satisfactory results

The photosensitive or photoconductive walls Insensitive particles 13 can be made of any suitable inorganic or organic material be. Typical inorganic materials are vitreous selenium, alloyed with arsenic, tellurium, antimony or bismuth vitreous selenium, etc .; Cadmium sulfide, zinc oxide, cadmium sulfoselenide and many other substances. In the US PS 3121006 is quite a number of typical inorganic photosensitive materials specified. Typical organic materials are:

a barium salt of

l- (4'-methyl-5'-chlorazobenzene-2'-sulfonic acid) -

2-Hydroxy-3-naphthaic acid

with the C.I. No. 15 865: Indofast double scarlet toner, a pyranthone material, Quindo Magenta RV-6803, a quinacridone type pigment; Cyan blue,

a GTNF of copper phthalocyanine in beta form

with the C.!. No. 74 160; the alpha form of metal-free phthalocyanine

with the C.I. No. 74 100, Serve-Blue, a 3,3'-methoxy-4,4'-diphenyl-bis-

(l "-azo-2" -hydroxy-3 "-naphthanilide)

with the C.I. No. 21 280, Algol G. C, a 1iA6-Di (D, D'-diphenyl) -thiazole-

anthraquinone with C.I. No. 67 300, Naphthol-Red-B, a 1 - (2'-methoxy-5'-nitrophenylazo) -2-hydroxy-

3 "-nitro-3-naphthanilide, Indofast Yellow Toner, a flavanthrone.

One certain preferred photosensitive pigment that will achieve the desired results become, steiit meiaiifree rhihaiucyaniii in "X" -ruim shows how it can be produced by the method specified in FR-PS 15 08 173. The one before The organic and inorganic materials listed show some typical materials that can be used. It should be noted, however, that the photosensitive materials that can be used for the migratory particles are not exhausted.

The recording material shown in Fig. 1 can be prepared by any suitable method. Typical procedures include cascading or dusting photosensitive particles over the softenable material 12, the This process and other suitable processes are described in FR-PS 14 66 349 specified. A particularly satisfactory process involves mechanical mixing of the photosensitive particles with the softenable material dissolved in a small amount of solvent and then coating any suitable carrier layer with the binder mixture thus obtained. The coated carrier layer is then dried

In general, two basic types of make coat arrangements can be used. The first, by F i g. 1 shows the type illustrated a binder layer made of softenable material on an electrically conductive layer or carrier layer 11. The binder layer contains a softenable or plastic material 12 and in this layer homogeneously dispersed migratory particles 13. Another embodiment of the binder layer arrangement is illustrated in FIG. 2. This make coat arrangement contains an additional softenable one Layer 12a, with the softenable layer 10, the photosensitive particles 13 in a softenable Contains binder lZö, is coated It should be noted that that further modifications of the layer arrangements mentioned are possible and can be used, namely those in which one or more layers contain photosensitive particles which are substantially homogeneous in at least one of the softenable Layers are dispersed.

Furthermore, the softenable material can be a photosensitive or photoconductive plastic with in contain non-photosensitive particles dispersed in the plastic binder.

In general, the in the above-mentioned, the production of layered structures relating to French

see patents specified solvents, binding materials or softenable plastics as well the photosensitive materials in the recording material used according to the invention can also be used. In addition, more than one photosensitive material can be used in one and the same layer arrangement either together or in separate layers of the same binder.

The thickness of the softenable layer 10 for the abovementioned binder layer arrangements is in the range from approximately 'h to 16μΐη. If the layer is thinner than Ui μΐπ, excessively strong background effects occur during development, while relatively long development times are required for layer thicknesses over about 16μπι, which in turn leads to a low image density.

In general, the particle size moves for the of the binder layer arrangement used photo empiinuiiciien riginciiic iff of the order of magnitude VuH about 0.02 μm to about 2 μm, with most Photosensitive particles have a preferred submicron size of about 0.02 to 0.5 μm.

The even electrostatic charge, as indicated in Fig. 5, can e.g. when using an electrically conductive carrier layer 11 take place with the help of a corona charging head 14, which over the Top surface of the binder layer arrangement is performed and the one on this top surface Applies an even charge Typical corona charging procedures and those used to carry them out Devices are described in GB-PS 6,960,515 and in US-PS 2,588,699.

After the surface of the binder layer arrangement is evenly charged, it is replaced by a activating light image 15 exposed, as shown in FIG. 4 illustrates.

Upon exposure of the binder layer arrangement, it is developed by immersion in it a liquid solvent 16 contained in a container 17, as shown in FIG. 5 illustrates the development occurs over a relatively short period of time, typically 1 to 20 seconds. During this Development migrate the previously charged photosensitive particles that are not due to radiation have been taken through the softened and dissolving softenable layer and to the electrically conductive carrier layer in a form corresponding to the image configuration, as shown in FIG. 5 is indicated by the reference numeral 13 '. In contrast to the particles just considered the particles in the exposed areas of the softenable layer do not migrate towards the carrier layer; rather, they become softer with the Layer 12 washed away in solvent 16, as shown in FIG. 5 indicates the presence of a paver Image in which the migrated photosensitive particles 13 'in an image configuration on the electrically Adhere conductive carrier layer 11, indicates F i g. 6 at.

The solvent 16 used as a developer can be any suitable liquid or any contain suitable vapor in which the softenable soluble layer dissolves and the or the on the carrier layer there: photosensitive material in the form of the original image leaves unaffected The only requirement for the solution to be used or the one to be used Steam consists in the fact that he or she is merely the

has to dissolve softenable layer and that it or he has considerable electrical insulating properties must, so that the charge image is not electrically discharged during the layer solution. The working time of the Solution or the steam is in no way critical, namely not insofar as the carrier layer and the photosensitive material are chosen so that an extensive insolubility is given during development. In general, however, it is sufficient perfect to immerse the layer arrangement in the solution for a few seconds to remove the dissolve softenable plastic layer. Typical solutions are

Fluorochloroalkanes, trichlorethylene, Chloroform, ethyl ether. Xylene, dioxane, Benzene, toluene, cyclohexane, 1,1,1-trichloroethane, pentane, n-heptane, a kerosene solvent, m-xylene,

TstrEChlorkohlsnS '^ f ^ Thinnhpn

2 ^r >

so

Diphenyl ether, p-cymene, cis-2,2-dichloroethylene, nitromethane, Ν, Ν-dimethylformide, ethanol, Ethyl acetate, methyl ethyl ketone, Ethylene dichloride, methylene chloride, 1,1-dichloroethylene, trans-l ^ -dichlorethylene etc.

When developed in a solution vapor, an image composed of selectively migrated photosensitive particles is formed on or near the Formed carrier layer.

If the development is carried out by exposure to heat, are generally sufficient temperatures ranging from 80 to 150 ° C at a temperature in the order of magnitude a voltage of a few seconds contact time.

In another embodiment, the layer arrangements according to FIG. 1 and FIG photoconductive migratory particles 13 used are replaced by non-photoconductive particles that have electrically conductive or insulating properties. Typical materials for such

Image display *) with regard to processing conditions

Particles are soot, garnet, iron oxide and insoluble dyes. Apart from the use of a non-photosensitive material, and charging by a mask pattern or the use of a geform- * i th electrode etc., the method and materials are the same as g in the production of migration images with the layer arrangements according to F i. 1 to 6 can be used. So they exist z. B. preferably from 0.02 to 2.0 μίτι large divided

ίο conductive or insulating material. As already These methods and further embodiments are carried out in the above-mentioned FR-PS 14 66 349 described. Suitable for the method according to the invention

r> Layer arrangements can generally be based on a positive or negative surface potential on the order of about 10 to 4000V charged will. An image produced in this way is then either a positive or a

? n <»in Nlocraltw A n Hi *» nhntrtpmnfinrilipnAn Partilra! - -ο- "·· - —- (...-—-. ^ ₁ ■ - -.

are deposited either in the unexposed or in the exposed areas. The area in which they are deposited depends on the respective Binder or softenable material as well as the processing of the materials, as is the case for a number of pigments is given in the table below. With the help of panels in which the binder is a Copolymer of methyl styrene and vinyl toluene gave the best results when charged positively and a development in trichlorethylene. Positive-positive images (p-p) were almost always obtained, which is to mean that a positive image is formed from the original image by photoconductive particles which were deposited on the unexposed areas. By using plates, at where the binder was a partially hydrogenated rosin ester, the best results were obtained negative charge and development in cyclohexane achieved. In the process, positive-negative images (p-n) were almost always obtained, in which a negative image was a Original image was formed by photosensitive particles, which are in the activated radiation areas reached had deposited.

Photosensitive pigment

Binder boards I **) Developing solvent Trichlorethylene cyclohexane

Surface charge

Binder plates 2 ***) Trichlorethylene cyclohexane

Yellow pigment CI. 67 300 Benzidine Yellow

Blue pigment CI. 74 160 Blue pigment CI. 21 180

indigo

; high v

P-P P-P p-n p-p p-n low low ges V P-P tot V < P-P P-P high v high v P-P P-P P-P P-P p-p p-p P-P p-n P-P PP p-n P-P little low ges V

p-n

P-P

p-n

p-p p-n p-p p-n p-n p-n

909 615/28

continuation

Photosensitive pigment

Binder plates 1 * ") developing solvent Trichlorethylene cyclohexane

Surface charge

Binder plates 2 * ")
Trichlorethylene cyclohexane

Flayanthron higment
Red pigment

Blue pigment CI. 74 100

Naphthol red B

Phthalocyanine X form
Pyrazolone red
Magenta pigment
Red pigment CI. 15 865

PP
pn
pn

low v

PP
high v

p-p

P-P p-n

P-P

p-p

P-P

all gone p-p

p-p p-p

P-P P-P

P-P p-n

P-P

p-n

low v

p-p

high v

P-P

P-P

P-P

PP PP
pn
pn

low v
pp
high v

P-P

PP
pp

PP
PP

PP
pp

p-p

pp
PP

p-n

PP
pn

P-P P-P p-n p-n p-p p-n

p-n p-n

pn
pn

pn
pn

*) The image is shown as positive-positive (p-p) or positive-negative (p-n). Which image is displayed depends depends on whether the photosensitive particles are deposited in areas reached by the activating radiation or not be reached.

") The binder consisted of a methylstyrene-vinyltoluene copolymer.

**) The binder consisted of partially hydrogenated rosin ester.

The ratio of photosensitive pigments to the binder or softenable material is in on the order of about 1 part by weight of photoconductive pigment to about 1 to 12 parts by weight Binder. Larger amounts of binder than the weight ratio of 12 to 1 result to an unacceptable loss in image density, albeit at ratios in excess of 12 to 1 Binder to photosensitive particles nor an image can be generated.

The invention is explained in more detail with reference to the following examples. The proportions and stated in each case Percentages relate to weight data, unless stated otherwise.

B e i s ρ i e 1 I

A sample of X-phthalocyanine was made by using commercially made metal-free Phthalocyanine in alpha form was neatly ground for 48 hours. This was done in detail in the Way that 40 g of the commercial phthalocyanine with 1500 g, 20.6 mm greet Borundumzyiinder in one υθ-ball mill bottle on a yourself with 72 revolutions per minute rotating roller mill were ground. After grinding, 100 ml Filled in methanol Then the obtained sludge was filtered in a larger amount of methanol washed and then dried

A dispersion coating solution was prepared by adding 1 g of X-phthalocyanine and 100 g of methylstyrene / vinyltoluene copolymer 10 g of toluene and about 20 g of 3.18 mm steel balls in one capacity were stirred by a mill owning about 50 g for 30 minutes.

After removing the steel balls, the solution was on a highly polished aluminum plate in a Thickness of about 0.13 mm applied using a # 5 wire-wound rod and air-dried to to obtain a layer thickness of 9 μίτι.

Example II

A dispersion coating solution was prepared by ultrasonic mixing in 1 part of zinc oxide powder with a mean particle size of about 0.1 μm and about 1 part of silicone resin was dissolved in toluene for about 1 minute. This dispersion was then on a Cast aluminum plate and dried at a temperature of about 50 ° C for one hour to obtain a To obtain a layer thickness of about 12 μm.

Example III

A second sample of X-phthalocyanine was made commercially for 15 days produced metal-free phthalocyanine in alpha form was ground cleanly to a pure material obtain. For this purpose, 40 g of the commercially available Phthalocyanine with 1500 g approx. 20.6 mm in size Borundum cylinder in an OO ball mill bottle on a rotating at 22 revolutions per minute Grind grinder. After the grinding, the phthalocyanine was drawn out of the bottle and Separated from the grinding cylinders and the loose powder After the production of the pure material, larger ones became Quantities of X-phthalocyanine produced by adding 9.5 g of the commercially available phthalocyanine 0.5 g of the pure material in a capacity of about 11. Ground glass container were, the one with 60, a diameter of about 16 mm

own glass spheres and was filled with 200 g of methyl ethyl ketone, on one with 130 Revolving mill revolving per minute for 18 hours. The content of the Glass bottle was filtered ultd at one temperature of 50 ° C for one duration. · of one hour dried.

A dispersion coating solution was then prepared by adding 1 g of X-phthalocyanine, 3 g of methyl styrene / vinyl toluene copolymer, 25 grams of Cio-12 isoparaffin solvent and 60 g of steel balls with a diameter of about 3.2 mm in a mill for 48 hours were stirred together for a long time.

After removing the steel balls, the solution was coating device Gardner-drawing using applied to an approximately 0.076 mm thick polyester film having a a 0.013 mm Bird applicator and dried for one hour then at a temperature of 7O ⁰ C.

Example IV

Besides that, 1 g of X-phthalocyanine in the dispersion coating solution was replaced by 1 g of a mixture containing 0.2t g of X-phthalocyanine, Contained 0.14 g of Algol yellow and 0.65 g of Irgazine red, Samples prepared in the manner indicated in Example III.

Example V

A dispersion coating solution was prepared by adding 10 g of arsenic (2% by weight arsenic) alloyed elemental selenium, 5 g of a copolymer of hexyl methacrylate and styrene and 13 g of toluene together with flint balls in a 000 ball mill bottle 96 Milled for hours.

After removing the grinding balls, the solution was applied to an aluminum-coated polyester layer applied by means of a Gardner drawer using a 0.01mm Bird applicator and air dried for 24 hours.

Example VI

A plate was prepared according to the manner given in Example I to have an image on it in in the following way:

1) Charging: + 500V

2) Exposure: approx. 3.2 lux sec tungsten lamp with

a color temperature of 3400 ° K

3) Developing: immersion in a trichlorethylene liquid

for a few seconds,

4) Result: A positive-positive image with a strong

contrast

Example! VII

A piatte was besides dall a partial hydrogenated rosin ester instead of methyl styrene / Vinyl toluene copolymer was used, according to the manner indicated in Example I. produced The image production was carried out by:

1) Charging: -600V

2) Exposure: approx. 2 ^ -Lux · sec tungsten lamp with

a color temperature of 3400 ° K

3) Developing: immersion in a cyclohexane liquid

for a few seconds

4) Result: a positive-negative image with a strong

contrast

Example VHI

One plate was apart from being Monastral Red instead of X-phthalocyanine was used in the manner indicated in Example I. manufactured. The image was created by:

1) Charging: + 300V

2) Exposure: 2152 lux sec tungsten lamp

in 3) Developing: dipping into a Cycloht;: n.n-liquid-

for a few seconds
4) Result: a positive-negative image

Example IX

r> One plate was apart that algol yellow was used instead of the X-phthalocyanine, prepared in the manner indicated in Example I. the Image production is carried out by

1) Charger: + 400V

2) Exposure: 10 760 lux sec

3) Developing: dipping in a trichlorethylene

Liquid for a few seconds

4) Result: a positive-positive image

Example X

Apart from the fact that Watchung-Rot B was used instead of X-phthalocyanine, one plate was prepared in the manner indicated in Example I. The image production was carried out by:

1) Charging: + 450V

2) Exposure: 2152 lux sec

3) Developing: immersion in a trichlorethylene> Liquid for a few seconds

4) Result: a positive-positive image

Example Xl

jn One record was apart from being a partial hydrogenated Koiophoniumester was used instead of the methyl styrene / vinyl toluene copolymer, accordingly the manner indicated in Example X prepared. The image was created by:

1) Charging: + 425V

2) Exposure: 10 760 Lux ■ sec

3) Develop: immersion in a cyclohexane liquid

for a few seconds
4) Result: a positive-negative image

Example XII

A plate was made according to the manner outlined in Example II. Imaging made by:

1) Charging: + 400V

2) Exposure: 5390 Lux ■ sec

3) Develop: immerse and stir in tetra-chlorocarbon for 30 seconds

4) Result: a positive-negative image with a special

resolution than 10 line pairs per mm

_6th Example XUl

A plate was produced in accordance with the manner indicated in Example III Die Büdherste'lung made by:

13th

t) Charging: +4000 V on a grounded plate

2) Exposure: 10.76 lux sec tungsten lamp

3) Developing: dipping and stirring in one

Trichlorethylene liquid for a few seconds

4) Fixing: Covering by dipping into a

Toluene solution containing 5% methacrylate casting and molding compound with subsequent air drying

5) Result: a positive-positive image with a resolution

Solution of 228 line pairs per mm, a gamma of 5, a maximum Density of 1.6 and a minimum density of 0.1 *)

Example XIV

A plate produced according to the manner indicated in Example IH was produced The image was created by:

t) Äufteden: -4000 V on a grounded plate

2) Exposure: 269 lux - sec

3) Wrapping: dipping in a trichlorethylene

Liquid with stirring for a few seconds

4) Fixing: pulling on by dipping into a

Methyl acrylate casting and molding material toluene solution and subsequent air drying

5) Result: a positive-positive book with a resolution

Solution of 228 double lines per mm, a gamma of 1, a maximum Density of 1.5 and a minimum density of 0.4 when viewed below red light

Example XV

A plate made according to the manner indicated in Example IV was used; the The image was created by:

1) Charging: +400 V on a grounded plate

2) Exposure: about 32 lux sec

3) Developing: dipping in a trichlorethylene

Liquid with stirring for a few seconds

4) Fixing: Covering by dipping into a

Methyl acrylate casting and molding material toluene solution and subsequent air ^Μ drying

5) Result: a positive-positive image with a resolution

solution of 60 double lines per mm appeared as a black image with excellent contrast and a thread ma from 1

Example XVI

A corresponding to the specified in the example JH w Wise prepared plate was used to subsequently convert a migration image into a photoelectrosolographic image by:

*) When used as a starting image for illustration The xerographic route was an excellent illustration achieved by using a light source whose emitted light had a wavelength of 400 nm.

1) Charging: +4000 V on a grounded plate

2) Exposure: 10.76 lux · sec

3) Developing: exposing the plate to a toluene

steam in the dark, then immerse in for a few seconds a trichlorethylene liquid with stirring

4) Fixing: pulling on by dipping into a

Methylacrylal casting and molding material toluene solution and subsequent air drying

5) Result: After inserting the plate into the

Toluene vapor formed a migration pattern. This picture was made into a photoelectrosolographic image there

implemented by that the plate is immersed in the trichlorethylene liquid became. The result was a positive-positive image with high resolution and strong contrast

Example XVII

A plate prepared according to the manner indicated in Example V was used to form a picture to be made as follows:

1) Charging: + 800V

2) Exposure: 755.2 lux · sec

3) Developing: on for a few seconds

immerse in a 1,1,1-trichlorethylene liquid while stirring at the same time

4) Fixing: Covering by dipping the plat

te in a methyl acrylate-toluene solution and then air dry

5) Result: a positive-negative image with a con

grid density greater than 1

Example XVIlI

A plate prepared according to the manner indicated in Example V was used to form a picture to be made as follows:

1) Charging: + 660V

2) Exposure: 753.2 lux - sec

3) Developing: on for a few seconds

immerse in a trichlorethylene liquid while stirring at the same time

4) Fixing: applying a coating through

Immersion in a methyl acrylate-toluene solution and subsequent air drying

5) Result: a positive-positive image

If an insulating or dielectric carrier layer is used, as in Examples HI, IV and IXt to XIV is specified, the capacity of the dielectric carrier layer of the order of about 10 to 100 times lower than that of the softenable make coat.

The plates or layers used according to the invention differ from conventional ones 6; photoconductive plates in that they require a noticeable electrostatic contrast in order to to be effective. Such layers can be satisfactory with the predominantly over the binder

layer existing electrostatic image can be used.

Furthermore, in order to avoid abrasion of an image or decrease the image density, the relevant Image fixed during or after development using additional process steps will.

According to one method, the developer liquid softens the electrically conductive carrier layer or a on the carrier layer located thin film, so that the image particles in the carrier layer or in the thin film can be embedded. According to another method, the developer liquid evaporates

and leaves a coating of plastic dissolved over the formed image. By using additional Process steps after the development can be carried out either by coating the image particles or by embedding the image particles in the electrically conductive support layer or in a thin film the carrier layer are fixed. According to another modification, in addition to the Photoconductor and / or the plastic binder can be used to increase the sensitivity of the image carrier assembly to increase and / or to change the type of representation from positive-negative to positive-positive.

1 sheet of drawings

Claims (3)

Patent claims: 1. A method for generating an image by means of a plate, which has a support base and a Has layer comprising softenable material in contact with migratory particles contains, in which an electrostatic latent image is formed on the plate, in which the softenable Material through the action of liquid or ι ο gaseous solvents or heat such is softened that the particles located in the image or non-image areas of the latent image selectively migrate to the backing pad and remove the softenable material and a portion of the Particles through the solvent, through characterized in that a softenable material is used that the particles uniformly contains dispersed and serves as a binder for the particles (13) 2. The method according to claim 1, characterized in that the development takes place in that the softenable layer is first exposed to solvent vapors and then heated. 3. The method according to claim 1, characterized in that when developing with a liquid Solvent the softenable material and some of the migratory particles with the liquid Solvents are removed so that on the electrically conductive support substrate through the softenable material migrated through migratory particles in an image configuration lag behind.