DE2712864A1 - PRESENSITIZED SYSTEM FOR REMOVING POSITIVE DRAWINGS - Google Patents

Description

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Minnesota Mining and Manufacturing Company, Saint Paul, Minnesota 55101, V.St.A.

Presensitized system for taking positive prints

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The present invention relates to photomechanical manufacturing of images and is especially used for

Printing of color separation positives in preparation for the multicolored lithographic reproduction.

When printing picture sheets, the halftone method is usually used used, in which the actual printed image is made up of a multitude of tiny dots per square centimeter composed of a single color. The variation in density observed when viewing an image sheet is achieved by a controlled variation of the size of the dots relative to the unprinted areas between the dots evoked. In black and white picture sheets these points are only printed with black color. For printing a color reproduction requires the three basic colors for the process, yellow, magenta and cyan. In some cases, that is, under color removal methods, a black print is also used. Each color is printed using a separate printing plate, on which a dot pattern can be found that the FarD arrangement, for example by Ka ^ enta, as qnf dem Original represents.

To prepare these plates, aas-original color picture,

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either photographically with filters, masks, contact decomposers, etc. or electronically, i.e. with color decomposers, in

a series of three or four halftone negatives or positives "separated".

Each of these represents one of the colors and contains an order of points showing the quantity and distribution of those Reproduces the original color.

Before the actual color printing is carried out, the The color separation should typically be tested in some way. One method of performing this verification process consists of preparing a "press trial" in which actual printing plates are prepared and one of them Color sheet is printed with all colors. This is of course unattractive from an economic point of view. Alternatively various prepress inspection systems are available so that the actual panels are not prepared have to.

A commercially available prepress test system includes an overlay system in which four separate and separable sheets of colored images, each on a clear substrate held, which individually the yellow, magenta, cyan

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fax layers and, if necessary, represent the black areas of the original, are overlaid. In this way, complete color control of the original can be visually monitored. This system is relatively inexpensive and provides the ability to quickly visualize color movements using the same test. Such an overlay system using a positive-acting photosensitized system is known from US Pat. No. 3,211,553. While this type of inspection system has enjoyed remarkable appeal, the superposition of such a variety of sheets has inherent disadvantages. For this reason, a single sheet printing system has been disclosed in which the three or four color images are actually layered in close contact on top of one another in perfect register. This results in a significant reduction in the diffusion of haze and light compared to the overlay system and a close approximation of the actual! neuter press result. Such a system, da3 ^at: enjoys remarkable agreement, uses a negative 'acting photo-sensitized system is described in US-PS

j 3,671,236.

! Both the overlay system and the single sheet color proofing system are of use and often it is desirable-

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worth using both systems for testing. For example, the overlay system can be used in a home prepress test of the quality of the film extract, while the single sheet test can typically be used as the final consumption control test. Therefore it would be advantageous to have a complete color matched system in which the overshoot test, the single sheet test, and the printing ink use matched colors and services so that no errors are introduced during color correction, i.e., steps v / erden undertaken to match the color test to the original. In addition, Pri; 'fun _o ssysterne should be consistent in order to color in all their aspects together with faithful V / ieder _o abe, no dai? the craftsman can have confidence in his judgment of the type and extent of the correction.

The present positive-acting photosensitized Systems have been used in the overlay systems as mentioned above and in the preparation of the actual printing plates Application found. Attempts on single-leaf positive testing systems have heretofore been predominantly limited to the use of sticky colored photopolymer tint systems. In these cases, the color is common by hand by the customer in his own workshop

<applied. That is why such a system

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many disadvantages. For example, it has been determined that the amount of toner picked up by such a system changes with the conditions of the environment of each workshop and so control of the paint layer and shade becomes difficult. That in turn undermines reliability any assessment of the type and extent of color correction, which is necessary in the color separation positives. Piiotosensitized Colored leaves for parb testing can be more uniform and can be checked more easily at the manufacturer than in the buyer's workshop, resulting in a more consistent process leads.

iis is very desirable to have a positive working 3ildsystem available not only with regard to lithographic printing plates is used, but in a color-matched set of overlay ^ addition - ßinzelblatt-Vorpressprüfun ₀ ssystemen provides UNAE. To the best of my knowledge, such a system has not been accessible until now.

According to the invention, positive overlay and single sheet color proofing systems are used provided for the pre-compression test of colored sheets.

! In the overlay system, suitably colored pre-

'Used sensitized sheets, each one clear

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colorless transparent cover sheet containing with a surface, those with a thin layer of a suitably pigmented one Polyvinyl acetal resin is coated, over which is a photosensitive layer, which is a poly complex of Contains oxidized anion diazonium salt, which is able to decompose in areas struck by light, so that it can easily be removed in these areas with a liquid developer. If you put each color sheet the appropriate color separation positive and image development, the sheets can be placed in register to form a to deliver a color test of the original.

For the single sheet delivery system contains a presensitized 31 instead of a carrier sheet with a smooth release surface, a coating of the above-mentioned diazonium

salt, a pigmented Polyvinylacetalharzschicht above the Diazoniumsalzschicat, a colorless barrier layer above \ of the pigmented layer, the barrier layer in the insoluble liquid developer i for the diazonium salt,

preferably a pressure sensitive adhesive layer over the barrier layer and a removable thin protective layer over the adhesive layer. In use, the thin protective layer is stripped from the pressure sensitive layer and the sheet is then laminated to a suitable substrate. The carrier sheet is then removed and the photosensitive

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System exposed through the appropriate separation positive and developed like a picture. A second presensitized sheet will ^; over the first structure _f eschichtet una similarly developed. The entirety of sheets necessary to give a full color test is similarly laminated and developed so that a single substrate is provided with a full Faro prepress test and an original thereon.

The aforementioned US Pat. No. 3,211,553 uses hetero- or poly-complex oxidized anion salts of diazonium compounds as a positive-acting photosensitive system therein. The composition disclosed is based on the Haftun _o of the non oelichteten piazoniumsalzes on the base material, that is, i-ietall or polyester, and in some cases on an overlying layer of a resin / pigment dispersion for image retention. In the areas exposed to light, the decomposition of the diazonium salts leads to products in the layer which can be attacked and removed by an alcohol-water developer. Any overlying layer is accordingly removed during development. Furthermore, when used on a polyester backing, a separate resin is typically applied to this backing in order to increase the adhesion of the diazonium salt to the base material. At the

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exposure and development, this resin remains in the exposed areas and could therefore lead to the tendency to soil background parts, since pigment particles and ¹ . i '-. roige' precipitated products of the diazonium salts easily adhere to the arz.

It must also be used to remove the residue that has not been exposed colored diazonium complex salt from the image areas, to ensure the ricutigen hue, typically the diazorium salt in a bleaching or fixing process through the overlying layer of paint without damaging it to be drawn out, v. furthermore, since the light-sensitive Ijiözoniumsalz is below the colored layer, aas exposure to colors that are strong in the ultraviolet Absorb area, such as black or yellow, through a transparent one Base sheet or a transparent reverse side. If the exposure is carried out through a colored layer, extraordinarily long exposure times are required. With a cut sheet inspection system, it is often desirable to place the test piece on a relatively opaque or diffuse substrate, such as paper or metal, to place on which the exposure would have to take place through the overlying colored layer, which is related to those already mentioned long exposure times.

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ORIGINAL INSPECTED

V, s, it was surprisingly found of _o that rSilaer of very high <'}^uality; it can be obtained if the complex iiazonium salt is applied as a top layer above a colored resin / pi ^ .Tient layer described below. There is little evidence that undercutting, that is, migration of the dissolving, aurcu? Hoto produced degradation products, takes place in the parts not exposed to light, not even in the fine skin tone parts, which typically leads to image loss.

In order not to be tied to the theory, it is assumed that the UV exposure of the relatively insoluble hetero-isopoly complexes oxidized anionic diazonium salt layer, which lies above the colored resin layer, decomposition B products provides which the solubility of the diazonium salt layer and probably the underlying adhesive layer and thereby the removal of both by a suitable one Allow developers. The solubility of the unexposed area remains unchanged and he is thus insoluble in the developer. The heteropoly anion, e.g. tungstophosphate, resulting from photodecomposition, is a heavy, large anion and is unlikely to migrate outward very easily. It also likes a kind Form association product with the underlying pigmented resin.

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-H-

üie La _t; e of jjiazoniumsalzschicht erlaunt above the Farbscnioht the imaging of opaque layers on opaque backgrounds without or with Weni _e - Steijerun ^ of the exposure time, as also allows a simpler and more complete removal of the colored diazonium salt of the upper hexes of the colored resin layer. Furthermore, since there is no interest in binding the diazonium salt to the base, the backgrounds are cleaner. Thus, when using a thin separating layer which is soluble in the developer between the diazonium salt and the color layer, the diazonium salt itself can be removed during development, so that the need for the bleaching or fixing process is completely eliminated.

The oxidized for the present irfindun _oc ^ jeei Neten hetero- or IPopolyKomplexe diazonium salts are known and their Herstellun ^ smethode described in the aforementioned US Patent No. 3,211,553. In general, compounds capable of producing a polycomplex of an oxidized ion are formed from weak acids of certain amph.ot.jrer ϊ -metals. These weak acids are characterized by the ease with which they condense to form anions which contain some molecules of acidic anhydride. You can forming one

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- "IS -

.anion? condense, aas ledi _o Lich contains a -i'yo SJureanhydrid and then be called or ^ .enauer Isopolysüuren, compounds with an oxidized eineio laopolviCümplex anion. j'eri.Oi ^ they can be condensed with other acids, whereby they form ^T eteropoly-acids, that is, compounds with a hpt ^ ronolykOiiiplexierte oxidized anion, De, for example, odfik ^ tungstophosphoric acid. These heteropoly and isopoly compounds which provide the poly complexes of oxidized anions are usually very soluble in water. Üiazoverbindunjen to form a water-soluble seur scLleciit Heaktionsproaukt with ve ¹ '-scnieaer.en, wherein the reaction over the photosensitive üiazo ^ roup Expires and thereby forms a complex diazonium sal ζ .. Despite the formation of the water-insoluble Keaktionsproduktes retains the diazo ^ roup their photosensitive character. Therefore, when the diazonium salt is exposed to actinic light, the diazo group is destroyed and the poly-complex diazo reaction product is decomposed. Obviously, the poly-complex oxidized anion returns completely or largely to its original soluble character.

Examples of for use in the present invention suitable polycomplex oxidized anions are:

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The salt of p-diazodiethylaniline ^ zinc chloride double salt and
Sodium-1 2-molybdatopho.sphat;

then the salt of 4-Mazo-4'-methoxydiphenylamine chloride and

Sodium 12 molybdate phosphate; ■

the salt of 4-tolyl-mercapto-2,5-diethoxybenzoldiazonium

chlorid · zinc chloride double salt and sodium 9-molybdatophosphate; ^!

t the salt of p-diazo-diphenylamine sulfate and sodium-12-

molybdate phosphate;

the salt of 4-phenylacetamido-2,5-dietoxybenzoldiazonium- \ chloride · zinc chloride double sal ζ and sodium-12-wolfraraato- i phosphate; j

the salt of 2,4-dinitrodiazobenzene diazonium chloride zinc

chloride double sal ζ and sodium 12-tungstophosphate; ! the salt of 4-nitrodiazobenzene diazonium chloride * zinc chloride- j

Double salt and sodium 12-tungstophosphate; j

the salt of p-diazodiphenylamine sulfate and sodium 12-tungstophosphate ;

the salt of 4'-methoxydiphenylamine-4-diazonium chloride and
Sodium 12-wolframatopho sphat;

the salt of 4-N-morpholino-2,5-di-N-butoxybenzenediazonium chloride · zinc chloride double salt and sodium 12-tungstophosphate;

the salt of 4-N-morpholinobenzene diazonium chloride · zinc chloride double salζ and sodium 12-tungstophosphate;

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the salt of p-diazodiethylaniline · zinc chloride double salt and Sodium 12-tungstophosphate;

the salt of 4-methyldiazobenzene and sodium 12-tungstophosphate and

the salt of 4-N-benzamido-2 _f 5-diethoxybenzene diazonium chloride · zinc chloride double salt and sodium 12-tungstophosphate.

Various resins can be included with the diazonium salt in order to impart special characteristics to the photosensitive layer, that is, the bonding of the photosensitive layers Layer to improve the underlying pigmented resin layer, etc. Such resins must be used in the Solvent soluble, from which the diazonium complex is layered, and resistant to acids and Alcohol-water developer solutions. Exemplary places are Saran F-31G, a vinylidene chloride / acrylonitrile copolymer from Dow Chemical Corp., and VAGH, a vinyl chloride acetate resin from Union Carbide Corp. Typically can up to about 50 percent by weight of such a resin in be included in the photosensitive layer.

The colored resin undercoat includes a polyvinyl acetal resin with a color pigment dispersed therein. The acetals are produced through a well known reaction

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formed by aldehydes and alcohols. Stoichiometric leads the addition of a molecule of an alcohol to a molecule of an aldehyde to form a hemiacetal. Because of their inner Instability, the hemiacetals are hardly isolated, but instead converted into an acetal with a second alcohol molecule, i.e., a resin having a group represented by the general formula

in which R represents a hydrogen atom or an alkyl group comprising 1 to 4 carbon atoms.

It is of course also known that by controlling the reaction conditions and concentration of alcohols and Aldehydes, the proportion of hydroxyl groups, acetal groups and acetate groups in the resulting resin can vary. To be effective in connection with the present invention

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the acetal functionality, i.e., the percentage of acetal groups within the resin, should be at least 50 percent by weight with the equilibrium primarily forming hydroxyl and acetate groups.

Examples of polyvinyl acetate are polyvinyl formal resins, such as! tormvar from Monsanto Chemical Co., where R is in the the above general formula denotes a hydrogen atom, and polyvinyl butyral, such as Butvar from Monsanto Chemical Co., wherein R in the above general formula represents a CH ^ -CHp-CHp- group.

In order not to remain attached to the theory, it is assumed that the heteropoly anion, e.g. tungstophosphate, because it is relatively heavy, migrates down into the polyvinyl acetal resin layer where an association product can be formed or cleavage of the acetal group is brought about. Either of these two effects affects the solubility properties of the resin in such a way that it can be removed in the areas exposed to light.

The polyvinyl acetal layer usually contains the appropriate colored pigment in an amount of from about 30 to about 50 weight percent, and preferably from about 40 to about

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4 5 percent by weight to ensure adequate film strength, scratch resistance and to ensure developability of the layer. Decreasing pigment concentrations require higher layers of unweighted layers in order to achieve the appropriate color density Layer to reach while stony concentrations the Increase the difficulty of image development.

The colored layer can be applied to an _o eagnete support; can be applied in a known manner, usually by layering techniques. The coating solution can be conveniently prepared by dispersing the desired pigment in a suitable solvent and adding the polyvinyl acetal resin, grinding in a ball or roller mill, and carefully dispersing the solid pigment in the resin mixture. The mixture can then be diluted with a solvent to the concentration of the coating solution, between about 1 to 10 percent solids, which are suitable depending on the coating method.

Since this embodiment of the present invention applies primarily to use in overlay color printing, must have colorless, transparent sheets to support the pigmented resin layer and the photosensitive coating, which is preferably dimensionally stable, can be used. An example of such materials are polyester,

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j ζ.3. Polyethylene terephthalate. The 'choice of the support is not critical in terms of 3ildoildun _0th is

ι for example a printing plate the desired end product,

ι so is any conventional support rnö ^ licu.

According to the general description of the invention, the present invention should; will now be described in detail using the following non-limiting example in which all parts are given as parts by weight unless expressly stated otherwise.

EXAMPLE I

1342 g of p-diazodiphenylamine sulphate are dissolved in 64.51 of 60 g of water in a vessel. The solution is then filtered to remove undissolved constituents. In a second vessel, 4475 g of sodium 12-tungstophosphate are dissolved in 13.3 l of water.

The second solution is added to the diazo solution with constant stirring. A precipitate forms, causing the formation of an insoluble complex diazonium salt ;? indicates. The reaction mixture is stirred for an additional hour to allow the reaction to proceed to completion.

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The precipitate is then filtered through a filter press severed.

The filter cake is washed with water until the water is washed out a constant pH -, / er zei ^ t. The filter cake washed in this way is dispersed in isopropanol until the precipitate turns from a yellow color to an orange color and filtered again. The filter cake obtained is in one dried for 24 hours at 32 ° C.

An I-iahlbase is ieren by Disper _o and grinding of the following mixture in a ball mill: Formvar 12 / OE5 (polyvinyl formal resin from Monsanto Chemical Co.) 3.2 parts

Formvar 7/95 E (polyvinyl formal resin from Monsanto Chemical Co.) 1.6 parts

i'ionastral Blue 3T-297-D (blue phthalocyanine pi ^ ment of the DuPont Co.) 3.2 parts

1,1,2-Triohloräthan as a solvent 92.0 parts

The grinding base obtained is diluted by adding further solvent to a 3 percent solids:! ·) Solution. This dispersion is then evaluated for a 2 mil transparent colorless Polyäthylenterephtalatpolyesterbasis

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splinted and dried at 160 ° F. The result is a 3e

layering of 500 mg per m ".

Fourteen parts of the diazonium salt are stirred in 86 parts of acetone until a fine suspension results. 0.16 parts of concentrated saline are added to the suspension in order to dissolve the diazonium salt. The solution is then filtered to remove the dissolved residues. Subsequently, the Lösun _u sufficiently 3aran 1 '' - 31G (PoIyvinylidenchlorid / acrylonitrile Oopolymer Dow Chemical Go.) Was added to obtain a weight ratio of diazonium salt to resin such as 5 ^ u 1. Finally as much methyl ethyl ketone is replaces them to _o that a volume ratio of acetone: methyl ethyl ketone, such as 1: 1 are obtained.

Then the photosensitive layer on the color image will not be Applied under subdued light and low humidity. The result is a dry coating with a

2
Weight of 45o mg per m.

In the same way inagentafarbene and geUbe overlay deduction sheets are prepared as a companion the cyan Sö _tj en described above. Watchung Red RT-698-D, a Ka _u entapigment from DuPont Co., was used in place of the oyan pigment for the production of the Haagabogen

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used. Accordingly, Benzidine Y'ellow Υϊ-564-D, a yellow pigment from DuPont Zo. , used.

The test sheets were passed through from the coated side Camera off, positive actinic light use exposed to a carbon arc exposure unit.

After exposure, each sheet was imaged with a Solution developed which consists of 79.2 parts of water, 19.4 parts of n-propanol, 1.3 parts of Sipon WD (wetting agent from American Alcolac) and 0.1 parts of potassium borate. Each sheet was rubbed with soft cotton, which caused the light to decompose Diazonium layer and the underlying color layer have been removed. The arches were then covered with cold Rinsed with water and dried.

Since the photosensitive diazonium layer itself is yellow, the sheets obtained were not representative of the true colors of the pigment bound on the sheets. To overcome this, each arch was treated with a solution of the following ingredients:

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water

Sodium acetate
Ethanol

Tergitol 15-S-9 (surface-active coat from Union Garbide) Sipon WD

42 parts 3, o parts

44 parts

8, ο parts 3, ο parts

The arches were rinsed with cold water and Dry immersed in the solution for 1 minute.

There were true-to-life images, which originated in detail with the halftone images of the positive camera borrowed color separations matched, received. Three arches were placed one on top of the other in register on a white background accurate evidence of the three color prints was obtained.

About the need for fixation or bleaching of the picture sheet Avoid using a solvent in the developer soluble layer between the pigmented polyvinyl acetal layer and the photosensitive layer are turned on. This layer provides a lock between the sensitized layer and the colored layer, see above

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The diazo layer was effectively removed upon development and thus the need for fixation is eliminated. The coating weight of such a layer should only be sufficient to build a barrier, i.e., 50 to 100 mg per m.

An example of a material for such a barrier layer is the diethyl ether of cellulose. The material must be of this type be that its coating solvent is the polyvinyl acetal layer does not attack and it must be inert in relation to the solvent. i.e. not vulnerable to it. Such a layer was not found to significantly reduce the development amals of the colored layer after exposure, i.e. obviously the heavy anion of the diazonium salt layer effectively pass through the barrier and produce the desired development features in the colored layer.

Alcohol-water mixtures are satisfactory developer solutions for the exposed diazonium salt and polyvinyl acetal layers.

i / ie already mentioned above, comprises a second embodiment of the present invention the representation

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a single sheet system for the prepress control of colored prints. In this case, the rules described in US Pat. No. 3,671,236, which apply to a negative working system, apply. To describe the erfindun _ö sgemäi3e single sheet system appropriate to refer to the figures. Fig. 1 shows an elevation of a photosensitive positive-acting test sheet. Fig. 2 shows in elevation the structure of Fig. 1 after lamination on a substrate, printing of the carrier sheet and exposure through a camera extract positive. Fig. 3 shows the structure according to Fig. 2 after the 3ild development. In Fig. 1, a carrier sheet is provided with a release surface 12, which may be the smooth surface of the carrier itself or a surface coating applied thereon. Above the surface is a photosensitive diazonium salt layer and a pigmented color layer 16 as described above. Above the ink layer 16 is a continuous, solvent-resistant, thin resin protective layer 18, the exposed surface of which has a thin adhesive layer 20, for example a pressure-sensitive adhesive applied thereon. The outer surface of the adhesive can typically be protected from contamination by dirt particles or grease by a removable protective liner 22.

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iiei application, we initially 3chutzeinla α _o e 22 subtracted from the lClebstof fooerfl iclie and the remaining structure to a substrate 3o laminated (Fig. 2). After that, the wearer becomes bo-er. 1o from the structure _o ezo _u en, whereupon the structure in ^ ilöhT ^. is exposed through the _o ^ eei designated color separation positive corresponding to the i-'Krbe the coating 16. During the development of the image, the exposed parts of the diazonium salt layer 14h and the underlying Faros layer 16a are removed, leaving the color image in the areas 16b of the substrate and the adhesive versus the solutions used in the development process.

The illustrations are for explanation and lines only not the various layers and components in their correct dimensions or proportions to one another. In In reality, the layers are extremely thin.

After the photomechanical fabrication described above of the first color image on the substrate will be similar sheets with the other colors necessary for inspection applied one after the other and the images produced over the structure according to FIG

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To give colors

The release layer must enable the system from the Triiij itself or from the overlying Diazoniuuisalzschicht

j without breaking the bond between adhesive layer / suostrat or Diazonium layer / pigmented color layer to be removed - typically the separation is less effective between two layers formed in situ, i.e. the separation layer / oiazonium!

I salt layer, and therefore it is much more likely that,

a separation between the carrier base and the separation layer

i occurs. In such a case, the transfer fee

permeable to actinic light and also used in the Developer solution must be soluble. '

The release coating must also be insoluble and invulnerable depending on the specific solvent used, which is used for diazoniura salt coating. Examples of detachment oeschiciitunjen, which the named Fulfill conditions are polyvinyl alcohol, cellulose ether and gelatin.

The diazonium salt layer and pigmented polyvinyl acetal color layer manufacturing are, as noted above, relative to the Vielbotjen overlay color verification system.

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The barrier layer above the color layer inu3 must be resistant to the developer solution and to the solvent used to apply the adhesive layer. In addition, this layer must be continuous, colorless and transparent to actinic light in order to visually inspect the test piece. Furthermore, the relationship between the barrier bar and the pigmented layer is important, since a sufficient bond must be formed between the two layers so that they are not torn apart when the trigger sheet is removed. However, the bond must not be so strong that removal of the pigmented layer from the barrier layer in exposed areas is prevented. It has been found that the desired '7echselbeaiehun _o is present when at least one degree of incompatibility between the color-containing resins and the barrier layers. Examples of resins from which the barrier layer can be made are vorzu _ö sweise polyacrylates and methacrylates, and to a lesser extent polyvinyl chlorine-id-Gopolyrneri sate.

Transparent and colorless pressure sensitive adhesives and protective liners useful in the present invention are known from the aforementioned US Pat. No. 3,671,236.

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After a general description of the embodiment, it will now be described in more detail in the following example.

B EXAMPLE II

An approx. 51 mm (2-mil) thick film of smooth, transparent, colorless polyethylene terephthalic polyester was treated with a Coated solution of the following composition:

Hethocel A-15 (methyl ether der

Cellulose from Dow Chemical Corp.) 1.5 parts

Water 65 parts

n-propanol 33 parts

After press coating and drying at 7o C, a

2 dry coating with a weight of looo mg per m obtained for the release layer.

> A light-sensitive diazonium salt solution is given as an example I made and pressed onto the release sheet under subdued light and low humidity to form a

ρ dry coating weighing 4oo mg per m.

; Then the diazonium salt layer was immersed under

subdued light with the cyan-pigmented polyvinyl formal

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hnrzdi.sfersion _o e: ni'3 r3ei.spiel I bescnicntet and, 'dried. '' ¹ If a dry .teschic'itung with a C-weight of 500 m. Το οι received.

Then the pigmented aro layer was covered with plucked Acl.t :: iit eirier Lo sun ,; fol _c , enaer ^ usaiiimensetzun :; prei.be- -.ohi clit ot:

jJlvs.cite 2o41 (i-olymethyl methacrylate

hPV7 · dPT ''ir.'nn lui ^; ont Jo.) 3.0 ^ hurry

• ethyl acetate 97.0 parts

ijie <eschichtung, was allowed to dry for one minute at room temperature left and then dried in the oven at 160 ° F, ^ s became a

dry rtenchichtun ^ with a weight of 1000 m _Cj per m "obtained.

A clear, colorless, pressure-sensitive adhesive (Reissue ΙΠ-Ρ3? 49o6) was applied to the acrylate barrier layer

2 with a dry weight of 2,000 m ^ per m. After this A silicone-coated shoe insert was used for drying Paper SP-8o29 from H.P. Smith Co. ge ^ en the glue

to protect against dirt etc.

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ORIGINAL INSPECTED

In the foregoing explanation, a cyan one became Test sheet described. The de ^ leading ma ^ enta-colored, yellow and black (if necessary) structures similarly using the same techniques and ingredients with the exception of the insertion of some pigments, such as for example v / atchung Red KT 761-D, Benzidine Yellow YT 564-D and Cabot Regal 3oo R carbon black, manufactured will.

The photosensitive sheets can then be converted to standard sizes, packed in opaque containers and placed on the market. The sheets can be stored in their sensitized form and then used months later just as successfully as immediately after they were made.

When using the sheets for producing a Farbprüflin ^ s may be any suitable receptor substrate may be used. Sometimes the bank supply that is used for the special printing process is used. This is particularly advantageous when using something other than white paper , such as colored paper, cardboard or cardboard, plastic films or metal foils. If the printing block is white paper, the test piece is preferably placed on a light white block to ensure optimal viewing conditions

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attached, A particularly suitable back wall is because of the Dimensional stability, whiteness and moisture resistance "3M Brand Transfer 3ase".

3 in making a single sheet color test piece assembly the colors are developed individually and one after the other. A sheet of the color obtained by the first to be tested Is represented positively, preferably cyan (to minimize halation) is achieved by removing the silicone insert and Lamination of the color sheet on the back sheet prepared for development. Hand applied pressure with a rubber roller is sufficient to achieve a lamination. After lamination, the protective sheet is made of polyethylene terephthalate deducted. The light-sensitive layer, which is now on the back, is in contact with the corresponding color separation positively exposed. The exposed composite is then developed and bleached in the same way and with identical solutions used for the multi-arcs overlay system described above. This highlights an image that faithfully reproduces the reproduction and shows the full range of colors that would result if the entire system creation and the printing process are using appropriately matched ink with the color separation positive would have been carried out.

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'•' .in iio ^ s with the second to be tested color vorzu ₀ sweise GeIo is laminated on the cyanbildenthaltende Suo.strat. The corresponding Farbauszu ₀ is then brought isterarti _{o e} re j ust the cyan image spositiv. This is generally provided by a reservation of all bonuses and
The back leaf through a system of re ^ isterkennzeichnunjen or thorns. The photosensitive layer is in the
exposed and developed in the same way as the first color. u ± e verolei taenden! »la ^ entabö ^ er. and black, t ^ ^ ö he (if necessary) will be developed later, the _ÜR ebnis, would bejm printing, you will revive true. Ii? printing plates are used which are identical to aen
Faroauszu ^ spositive manufac- tured.

7098A0 / 0901

Le

e rs e 11 e

Claims (7)

Patent claims Iy presensitized positive-acting sheet material for use in the production of film color prints, characterized in that the sheet material is a pure, colorless, transparent sheet with a thin layer of paint , on a surface made of a polyvinyl acetalj resin with a pigment dispersed therein, and overlying the color layer is a photosensitive layer which contains a polycomplex oxidized anion diazonium salt which is decomposable by actinic light and both the light-sensitive Layer as well as the color layer in the exposed areas after exposure to a developer medium are easily removable. 2. sheet material according to claim 1, characterized in that the polyvinyl acetal resin is a polyvinyl formal resin. 3. Presensitized positive color proofing sheet, characterized in that it comprises a carrier sheet with a smooth release surface, a photosensitive layer containing a polycomplex oxidized anion diazonium salt decomposable by actinic light and above the Ϊ098ΑΟ / 0901 ORIGINAL INSPECTED photosensitive layer a color layer comprising a polyvinyl acetal resin with a pigment dispersed therein, Above the color layer a continuous, water-insoluble, transparent, colorless barrier layer, which in the The developer medium for the diazonium salt is insoluble, and the photosensitive layer and the color layer are easily removed of the barrier layer can be removed by the developer medium in the areas exposed by actinic light. 4. Presensitized sheet according to claim 3> characterized in that a transparent, colorless, pressure-sensitive adhesive layer is firmly bonded to the surface of the barrier layer on the other side of the color layer. 5. yorsensitized sheet according to aspect 4, characterized in that the release liner is bonded to the pressure-sensitive adhesive layer. 6. Presensitized sheet according to claim 3, characterized in that the polyvinyl acetal resin is a polyvinyl formal resin. 7. A method for producing a positive, multi-colored print sheet image on a single substrate, thereby marked 7 0 9840/0901 draws that a) a presensitized sheet according to claim 3 is bound to a substrate, b) the carrier sheet is detached, c) the presensitized sheet through a color separation positive corresponding to the color layer to produce a latent image is exposed, d) developing the image with the liquid developer medium the exposed diazonium salt and the associated color layer are removed, e) a second presensitized sheet according to claim 3 is connected to the first developed sheet, f) steps b - d are repeated and g) steps e and b - d are repeated in the order for further presensitized sheets nasL claim 3, wherein each of the color proof sheets has a different color and thereby the multicolored proof sheet is obtained on a single substrate. 709840/0901