DE2031825A1 - Dry transmission material - Google Patents

Description

"Dry transfer material"

The invention relates to dry transfer materials.

Dry transfer materials usually consist of a film, graphic symbols applied to this film and a layer of a pressure-sensitive adhesive or a reactivatable adhesive which covers at least the areas of the graphic symbols or symbols. Necessarily, the adhesive layer must extend over the picture character areas addition, because it is practically impossible to bring adhesives and a symbol or graphic symbols completely to cover, _t particularly when the graphical symbols are very small. Because of this difficulty, when the graphic symbols and the adhesive are applied with the same stencil, the two prints often do not coincide exactly and the adhesive often leaves part of the edge of the graphic uncovered. In order for the adhesive to cover the entire surface of all symbols, the adhesive usually has to be applied using a larger stencil than was used to apply the symbol

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the adhesive then extends beyond the pictorial areas.

It often happens that the protruding adhesive is transferred at the same time as the glyphs or that it is transferred is difficult to detach exactly at the edges of the symbols and then damage them.

If a pressure-sensitive adhesive is used as the adhesive, this enables its lack of cohesion resulting from a permanent paste-like state does not result in the formation of solid ones Relationships between symbols and symbols-absorbing Area to which the symbol is transferred.

If the adhesive is a reactivatable adhesive, then this must be included before it is placed on the groove that receives the symbols be moistened with a solvent. Admittedly, this ax of adhesives generally provides very good adhesion between the printing color of the symbol and the symbol-absorbing Surface, but the dry transfer materials made with such adhesives are very rare applied because of the circumstances associated with its application. The handling of the solvents for the adhesive is associated with dangers for the user, either because the Solvents are toxic or because as a result of their very low There is a risk of fire at the boiling point. In addition, it is virtually impossible to control the amount of solvent used to reactivate the Adhesive must be applied to be precisely measured. It is also not possible to apply the solvent to be limited precisely to the surface of the pictorial symbols and the solvent flowing over the edge of the image then also reactivates the adhesive outside of the Pictorial areas, so that this often refers to the pictorial receiving surface is also transferred. - ■

The invention aims to remedy these disadvantages.

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The dry material according to the invention comprises a carrier film and pictorial symbols applied to it, which adhere only a little to the film and which have many on its surface Microcapsules are occupied that adhere to the symbols; the shell of the microcapsules is inert to the solvent the printing ink as well as the contents of the microcapsules themselves; the encapsulated substance, also called the core, causes the glyphs to adhere to the glyph-receiving surface when the microcapsules are attached being crushed by touching this surface; the microcapsules resist light finger pressure and the encapsulated substance or the nucleus can neither the | Image symbols, i.e. the printing ink, dissolve the carrier film.

The invention also relates to a process for the production of the new dry transfer materials, which consists in first applying graphic characters from a printing ink to a film, the substances for the film and the printing inks being chosen so that they only adhere to one another to a small extent; waiting until the printing ink of the characters is sufficiently viscous to hold back the microcapsules and then applying the microcapsules; The strength of the symbols and the diameter of the m microcapsules are chosen so that the microcapsules penetrate deeply into the symbols by 1/2 to 1/5 of their diameter; the printing ink of the symbols is then allowed to harden and, if the microcapsules contain a reactivating substance for a reactivatable adhesive, the reactivatable adhesive is applied to the symbols and the microcapsules.

The film carrying the symbols is preferably composed of one translucent material whose surface tension is {39 cm 1st. Examples of such that can be used according to the invention Materials are polystyrene, polyethylene, tetrafluoroethylene. Polyvinyl chloride, polypropylene, polyethylene terephthalate, _ ^

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Styrene-butadiene copolymers. These foil or carrier materials can either be used as self-supporting foils or applied to paper. Furthermore, translucent, Papers coated with silicone, wax or chromium-fatty acid complexes, so-called Werner complexes, etc. are used reach.

As with the known dry transfer materials the printing ink made from a plasticizer-containing polymeric substance which also contains pigments for coloring. the Printing ink comes in the form of its solution in organic. Solvents applied, which must not be solvents for the carrier film. As a result, there are carrier film and Printing inks made from various polymeric substances. In addition, the linear adhesiveness of the printing ink should be compared to the carrier film are preferably below 40 g / cm, which means that the printing ink is only weak the carrier film adheres. This low adhesion is achieved by as much as possible the polar physics οchemical Bonds or the hydrogen bonds between the printing ink and the carrier film are switched off.

The following table shows some examples of backing sheet materials and suitable printing inks are given.

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Carrier film

Printing ink

Polystyrene

Polyethylene

Nitrocellulose stimulated with a

polymeric plasticizers

Polyvinyl butyral softened with dimethyl

cyclohexyl adipate

Ethyl cellulose made with dioctyl phthalate

Polyvinyl butyral softened with methyl abietate

Silicone paper

Chlorinated rubber softened with tricresyl

phosphate

Nitrocellulose softened with diamyl

phthalate

Glycerine-phthalic acid resin made with

Polyvinyl ether

Tetrafluoroethylene EthyleelIuIöse softened with dibutyl-

phthalate

Polyvinyl butyral made with tributyl phosphate.

The plasticizer in the printing ink fulfills two functions, As is known, it gives the printing ink film a sufficient one Elasticity so that the film is not torn when it is transferred. It also helps to increase adhesion, if the printing ink film is still moist and thus allows a better adhesion of the microcapsule! on the printing ink.

To apply the printing ink to the carrier film, a Process selected with the help of which a film thickness of at least 8 μm can be achieved, for example screen printing. After the printing ink has been applied, its viscosity increases. This increase in viscosity is due to the evaporation of the Solvent and manifests itself in the appearance of a surface adhesive effect, which disappears again when most of the solvents have evaporated. It was determined,

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that this surface tack occurs when 30 % of the solvents have evaporated and persists until 70% of the solvents have evaporated. Within these two limits, the microcapsules adhere easily to the printing ink film and the indentation resistance of the printing ink is sufficient, but not too high, for the microcapsules to penetrate to a depth of 1/2 to 1/5 of their diameter. Since only the free surface of the symbols is sticky, the microcapsules are only retained on these surfaces, although they are applied to the entire surface of the carrier film in any known manner, for example by dusting or with the aid of a gilding apparatus.

The encapsulation of flowable substances, liquids and adhesives in microcapsules is known and is used in various Patents and other publications.

According to the invention, as already stated above, the Shell of the microcapsules made of a substance that is inert to the organic solvents in the printing ink. Examples of this are gelatine, possibly in combination with other polymeric substances such as guinmiarabicum, be cited.

As already said, the walls of the microcapsules should tear or burst under a pressure above 100 g / mm. Of the The diameter of the microcapsules varies between 3 and 50 μm.

The adhesive strength that exists between the pictorial symbol and the pictorial symbol absorbing The area formed during the transfer of the symbol does not only depend on the adhesive or the adhesion effecting substance enclosed in the microcapsule, but also on the nature of the receiving surface away.

Therefore, the nature of the encapsulated substance that constitutes the core of each microcapsule becomes the nature

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made dependent on the icon-receiving area, under Taking into account the condition that the capsule core must not dissolve either the printing ink film or the carrier film.

The picture-taking substances can be roughly divided into three groups be classified:

1) Porous absorbent materials, such as paper, wood, plaster, leather, etc.; . '

2) non-porous materials such as glass, metals, bakelite and others;

3) Substances that become sticky when treated with a solvent for example polystyrene, which becomes sticky under the action of toluene, or polymethyl methacrylate, which becomes sticky under the action of acetone.

Should the symbols be transferred to substances of the first group or is the nature of the symbols absorbing Area unknown, this is how symbols and microcapsules become coated with a reactivatable adhesive and the microcapsules contain as a core a substance which reactivates the adhesive when it bursts through the microcapsule comes into contact with this. As reactivatable adhesives, adhesives based on neoprene, Polyisobutylene and ethyl cellulose and as reactivating Substance in the microcapsules xylene, toluene, perchlorethylene, Butyl acetate and mixtures thereof are selected. As reactivatable Adhesives are also adhesives based on nitrocellulose and cellulose acetobutyrate; in in this case the reactivating substance is preferred Butyl acetate.

In the embodiment of the invention, which is a reactivatable Adhesive is used, this is after fixing the microcapsules applied to the symbols and after the printing ink has dried. The adhesive is in the form of a

Solution and forms after evaporation of the solution • 009882 / 16U _ e -

BATH ORIGINAL

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by means of a layer which covers at least the areas bearing the symbols and preferably extends beyond them extends. The adhesive is applied with the aid of screen printing or a known application device.

So that the adhesive reactivates in the desired manner after drying by the substance contained in the microcapsules the ratio between the volume of solvent and the volume of adhesive on each icon must be appropriate be chosen taking into account the fact that by too small a volume of solvent, the outer surface of the adhesive layer with the image-character-receiving Surface comes into contact, is not reactivated while a Too large a volume of solvent dissolves too much adhesive and thus causes too weak adhesion for the symbols be detached directly from the carrier film.

A good reactivation of the adhesive, which enables a practically immediate transfer, is achieved when the ratio of the diameter of the microcapsules to the thickness of the adhesive layer 20: 100 to 60: 100 and the content of the microcapsules makes up about 90% of the capsule volume.

The inventive dry transfer materials of First embodiment are applied in the following manner: The dry transfer material is applied with the dry adhesive layer side placed on the icon-receiving surface. On every symbol that is transferred or rubbed through is to be made with the help of a hard object

ο
Pressure of at least 100 g / mm applied. Under this pressure, the walls of the microcapsules tear in the relevant area and the released capsule content is distributed in the adjacent adhesive layer and thereby only activates the adhesive that is in contact with the symbol, so that the symbol adheres to the receiving surface and from the. x carrier film is separated and thus transferred. After the transfer of the symbol, the substances evaporate,

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who have reactivated the adhesive and the adhesive reaches its maximum hardness and adhesive force and thus "causes strong adhesion between the printing ink of the symbol and the receiving surface.

With this type of dry transfer material, there is no risk of that adhesives transfer from the non-image areas because the microcapsules only cover the symbols and the substance enclosed in them does not activate the adhesive outside of the icon. In addition, the adhesive easily dissolves along the The edges of the picture oak fall due to the different material State between the adhesive that covers the symbols and the adhesive that breaks down into the non-graphic ones Areas extending into; one is paste-like during transfer, the other is hard.

A second embodiment of the dry transfer materials of the invention provides that the characters are transferred to a surface that is temporarily sticky can be made and that the microcapsules contain a liquid substance as a core, which when they burst or crushing the microcapsules comes into contact with the receiving surface, this receiving surface temporarily makes sticky, so that the symbols adhere to the receiving surface and their adhesion to this surface after re-hardening the receiving surface is sufficiently strong that the symbols adhere to it when the carrier film is deducted. For example, the symbols can be made from a nitrocellulose or glycerol-phthalic acid printing ink consist, which is transferred to a receiving surface made of polystyrene and which contain microcapsules in in this case an aromatic solvent such as toluene or xylene.

According to a third embodiment of the invention Dry transfer materials contain the microcapsules

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an adhesive that "when crushing the microcapsules with the receiving surface comes into contact and causes the adhesion of the pictorial characters to the receiving surface, wherein this adhesion remains when the carrier film is removed. In this case the adhesive can be in the form a solution in the microcapsules, for example Neoprene dissolved in toluene or a mixture of ethyl cellulose and polychlorophenyl, dissolved in toluene and Butyl acetate; the adhesive may also be in the form of a curable liquid which upon contact with a hardener upon crushing hardens microcapsules, for example a polysulphide adhesive which is hardened with lead dioxide “Contained the microcapsules have a curable adhesive, so the hardener can either be on the outer wall through microcapsules or be enclosed in other microcapsules that also brush the free side of the symbols.

The invention and its advantageous embodiments are will now be explained in more detail with reference to the accompanying drawing.

1 shows a perspective view of the drying material according to the invention;

Fig. 2 to 5 enlarged cross-sections of the dry over-

transmission material according to the first embodiment, which shows the various stages of transmission reproduce;

Fig. 6 to 9 enlarged cross-sections of a dry over-

carrying material according to the second form of training, reflecting the various stages of transmission;

Fig. 10 to 13 enlarged cross-sections of the dry room

support material according to the third embodiment, the various stages of transfer

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display schematically. The same parts are provided with the same reference symbols.

The dry transfer material according to the invention, including rub-through film called, consists of a carrier film 1, on which weakly adhering graphic symbols or symbols are printed. Each icon is on its own Area occupied by a layer of microcapsules 3, which are retained by the printing ink and partially enclosed in it will.

According to the first embodiment shown in FIGS the microcapsules contain a (not shown) | reactivating substance; the figurative areas and the microcapsules are covered with a layer of a reactivatable adhesive 4, which optionally also includes the non-graphic ones Areas covered.

If the rub-through film with the symbol 2 with a receiving sheet 5 brought into contact and on the pictorial area if a pressure is exerted, the. Microcapsules and the adhesive layer covering them in the area between the symbol and the symbol-absorbing one Compressed area, as indicated in Fig. 3, exceeds if the pressure exerted on the pictorial area is 100 g / mm, the microcapsules will crush or burst, as seen in Fig. 4-, so that the reactivating substance released and the adhesive is reactivated in this area, but without das'Kklemittel im Bildzeichenfrei Activate area. As a result, the symbol adheres to the receiving film 5 with the aid of the intermediate layer 6 of the activated adhesive. If the carrier film 1 is lifted off or peeled off, the adhesive dissolves lightly and sharply along the edges of the symbol 2 and the symbol sticks to the receiving film 5, while the carrier film is detached from it.

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In the second embodiment shown in FIGS. 6 to 9 the microcapsules 3 contain a solvent (not shown). This rub-through film is suitable for a absorbing film 5j whose surface with the enclosed Solvents can be made temporarily sticky, i.e. can be dissolved. If the rub-through film with the Symbols 2 are placed on the receiving film 5 and pressure is exerted on the symbol-bearing area, see above become those in this area between figurative and receptive The capsules contained in the film are pressed together as shown in FIG. If the rub-through pressure exceeds the value

100 g / mm, so the microcapsules burst, as indicated in Fig. Ss, whereby the solvent is released and causes the surface of the receiving sheet 5 exclusively becomes sticky in the icon receiving area. In this area, the symbol sticks to the receiving one Film without an intermediate adhesive layer and the adhesion between the receiving film and the pictorial symbol becomes less after the solvent has evaporated sufficiently strong so that the carrier film 1 can be lifted off without the symbol 2 from the receiving one Remove foil 5. ·

In the third embodiment shown in Figs the microcapsules contain an adhesive (not shown). If the rub-through film comes into contact with the symbol 2 brought with the receiving film 5 and a pressure exerted on the icon-bearing area, the capsules are is compressed between the icon and the surface of the receiving sheet as shown in FIG. Exceeds the If the pressure is rubbed through 100 g / mm, the microcapsules burst as indicated in FIG. 12, leaving the adhesive exclusively is released in the pictorial area. In this area, the symbol is therefore made with the aid of a layer of adhesive 6 bound to the receiving film and the adhesive bond between the receiving film and the symbol is, ■ once the glue has hardened, strong enough so that the Carrier film can be lifted off without the image line

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Chen 2 is detached from the receiving film 5.

The following examples serve to further illustrate the invention.

example 1

A rub-through film according to the first in J ¹ Ig. 2 to shown embodiment produced; the carrier film consisted of polyethylene. Symbols were printed on one side of this carrier film.

The printing ink for the symbols had the following combination | Settlement:

Nitrocellulose. 1/2 see 5 parts

Soot. 18 "

Ethyl glycol 130 "

Isopropyl glycol ■ 4-0 "

Methyl abietate 80 "

While the printing ink of the icons was still sticky, " Microcapsules on the symbol-bearing side of the Carrier film sprinkled on; the microcapsules were only returned from the adhesive surfaces of the symbols keep.

The microcapsules had a diameter of about 20 μm and comprised 85 % by volume of trapped toluene.

After drying, the image drawing at least these were coated with a layer of reactivatable adhesive, having the following composition: -

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Neoprene AD 20 Magnesium Oxide Zinc Oxide Antioxidant Phenolic resin toluene

Cyclohexane

The thickness of the adhesive layer was about 40 μm .

example

100 Parts 8th Il 5 Il 2 Il 45 Il 300 Il 160 Il

The procedure was as in Example 1, but as a carrier film a silicone coated paper is used.

The printing ink had the following composition:

Glycerine phthalic acid resin with 55 % linseed oil 100 parts

White spirit 190 "

Cobalt naphtenate 6% in white spirit 0.9 "

Lead naphtenate 24% in white spirit 1.4 "

Manganese naphtenate 6% in mineral spirits 0.6 "

Carbon black 18 "

Polyvinyl ethyl ether "-20"

The microcapsules were about 25 μm in diameter and 80 % of their volume consisted of toluene.

The reactivatable adhesive had the following composition:

Ethyl cellulose with 49 % ethoxy groups 100 parts

polychlorinated polyphenyl resin 80 "

Toluene 300 "

Butyl acetate 100 "

Diamyl phthalate 20 "

The strength of the adhesive layer was /

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By i s pie 1

A rub-through film of the second embodiment was shown in Fig. 6 to 9 »produced, with the printing ink and the microcapsules applied as in Example 1 became.

The carrier film and the printing ink were the same as in FIG Example 2. The microcapsules were the same as in Example

The symbols were not covered with an adhesive layer '' U. The rub-through film obtained was suitable for "

absorbent sheets of polystyrene; the liability of the symbols to the receiving film was simply by the action of the Toluene on the polystyrene when the microcapsules burst causes under pressure.

Example 4

It became a rub-through sheet of the third embodiment produced, with when the symbols are applied to the carrier film and when the microcapsules are applied the symbols were processed as in example 1.

The carrier film consisted of polystyrene.

«■. ■

The printing ink had the following composition:

Polyvinyl butyral ethyl glycol diacetone alcohol Isopropyl glycol carbon black

Dioctyl sebacate

The microcapsules contained the following liquid adhesive:

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100 Parts 40 Il 20th It 13th η 15th Il 15th ■ 1

Polysulphide, medium MW 4,000 100 parts

Phenolic resin 5

Titanium dioxide 10 "

Calcium carbonate 25

The walls of the microcapsules contained on its outer side a hardener namely lead dioxide, .the reacted with ¹ the enclosed liquid adhesive when dionoo was released and this was cured as in the franztfnißchen Pat. No. 1,522,310 described.

Example 5

It became a rub-through film according to the third embodiment and proceed as in Example 1 when applying the symbols and the microcapsules.

The carrier film and the printing ink were the same as in FIG Example 2.

The microcapsules contained a liquid adhesive as a core the following composition:

Ethyl cellulose containing 49% ethoxy groups 100 parts

polychlorinated polyphenylene resin 80

Diamyl phthalate '20 "

Toluene ....- ■ 700 "

Butyl acetate 200 "

In this case no hardener was required; the adhesive dried by evaporation of solvents after bursting of the microcapsules.

The through rubbing films of Examples 3 bin \> take a somewhat longer time until the Haftum * ^bßWa adhesive bond exclusively between transmitted symbols and atifmimender area

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is strong enough for the carrier film to be removed can without detaching the symbol from the receiving film. That being said, the adhesive bond is between Icon and receiving surface very strong.

The rub-through films according to the invention can be whole generally apply for any graphic purpose.

PATENT CLAIMS:

72XXIV

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Claims (23)

OR. IWG. F. WUESTHOFF 0 DR.E.T. PECHM ANN vmixwou mm si DR. ING. V. BEHRENS mioM «w * Mi» ii U-38 04-1 patent claims 1.' Dry transfer material consisting aas a carrier foil, symbols of an ink and optionally a Klebraittelschicht, characterized in ^ that the side facing away from the carrier film (1) side of the image mark (2) having numerous adherent, a slight pinger pressure versus insensitive microcapsules (3) is occupied , the shell of which is inert to the solvent of the printing ink and the contents of the capsule and the content causes the pictorial characters (2) to adhere to a receiving surface (5) if it is released when the pictorial characters (2) are rubbed onto the receiving surface (5), but neither that
Symbol (2) can still dissolve the carrier film (1). 2. Dry transfer material according to claim 1, characterized in that the carrier film (1) consists of
a translucent material with a surface tension <39 dynes / cm. 3. Dry transfer material according to claim 2, characterized in that the carrier film (1) consists of
Polystyrene, polyethylene, tetrafluoroethylene, polyvinyl chloride, polypropylene, polyethylene terephthalate _s a styrene-butadiene copolymer or a paper coated with silicone, wax or chromium-fatty acid complex (Werner complex) « 009882/1644 4. Dry transfer material according to any one of the claims 1 to 3, thereby g e. ■ k e η η ζ e i c h η e t that the linear adhesion of the symbols (2) to " the carrier film (1) is <40 g / cm. 5. Dry transfer material according to one of claims 1 to 4, characterized geke η η ζ e ic h η et that the shell of the microcapsules (3) consists of gelatin, gelatin complexes, gum arabic and / or other polymers and that the capsule contents 80-90 $ > the total capsule volume. 6. Dry transfer material according to any one of the claims 1 to 5, characterized in that the Microcapsules (3) burst under a pressure of 100 g / mm or break. 7. Dry transfer material according to any one of the claims 1 to 5, characterized in that the microcapsules (3) have a diameter of 3-5Oyum, ¹ 8. Dry transfer material after one of the preceding ^ ngenen claims, characterized in that η e ΐ the symbols (2) and the microcapsules (3) with an m activatable adhesive (4) are coated and the microcapsules (3) contain an ejas adhesive (4) reactivating substance contain. 9. Dry transfer material according to claim 8, characterized characterized in that the reactivatable adhesive (4) an adhesive based on neoprene, polyisabutylene or methyl cellulose and the microcapsules (3) as reactivating substance is xylene, toluene, perchlorethylene and / or butyl acetate. 0098.82 / 16A4 4o 10. Dry transfer material according to claim 8 * thereby characterized in that the reactivatable adhesive (4) is an adhesive based on nitrocellulose or cellulose acetobutyrate and the microcapsules (3) as reactivatable Contains substance butyl acetate. 11. dry transfer material according to any one of claims 8 to 10, characterized in that the Ratio of the diameter of the microcapsules (3) to the layer thickness of the reactivatable adhesive (4) 20: 100 to "60: 100 and the contents of the microcapsules (3) 90 $ of the capsule volume matters. 12. The dry transfer material of any one of claims 1 to 71 for application to a surface that is temporarily can be made sticky, thereby g e k e η η ζ e i c h η et, that the microcapsules (3) contain a liquid which, when crushing the microcapsules with the receiving Surface (5) comes into contact, this temporarily makes sticky, so that the symbols (2) adhere to this "and their Adhesion after the re-hardening of the receiving surface (5) is sufficiently large that the symbols (£) when removed the carrier film (1) cannot be pulled off again. 13. The dry transfer material of claim 12 for application to a polystyrene receptive sheet, thereby characterized in that the symbols (2) from a printing ink based on nitrocellulose or a glycerine-phthalic acid resin and the microcapsules aromatic solvent, preferably toluene or xylene. 14. Dry transfer material according to one of claims 1 to 7f · characterized g e k e η η ζ e i c h η e .t that the microcapsules (3) contain an adhesive which when crushed 009882/1644 " ⁴ ""' of the microcapsules (3) in contact with a receiving Area (5) the adhesion of the symbols (2) to the receiving Surface (5) causes the symbols (2) to adhere when the carrier film (1) is removed. 15. Dry transfer material according to claim IH- characterized in that the microcapsules (3) contain the adhesive in a solvent. 16. Dry transfer material according to claim 15 g e k en η ζ e i c h net that the microcapsules (3) a Contains neoprene adhesive dissolved in toluene. 17. Dry transfer material according to claim 15 characterized it indicates that the microcapsules (3) a Mixture of ethyl cellulose and polychlorophenyl, dissolved in one Contains mixture of toluene and butyl acetate. 18. Dry transfer material according to claim Ik thereby geke η η ze I η et that the microcapsules (3) contain a liquid adhesive which hardens in contact with a hardener after the microcapsules burst. 19. Trockenubertragungsmaterial according to claim 18 characterized in that the hardener _t is located on the outer wall of the microcapsules (3). 20. dry transfer material according to claim 18 g e k e η η ζ ei c h η e t that the hardener to others, to the microcapsules adhering to the free surface of the symbols (2) is enclosed. 21. Method of making the dry transfer material s according to one of claims 1 to 2o, wherein one on one. - Carrier film applies symbols on a printing ink, in that the carrier film material and the printing ink are selected in such a way that their 009882/1644 Adhesion to one another is low that one after the order of the Printing ink waits until it is sufficiently tacky to hold back microcapsules, after which the microcapsules are applied and thereby choosing the layer thickness of the printing ink and the diameter of the microcapsules so that the microcapsules 1/2 - 1/5 their diameter penetrate deep into the printing ink, whereupon this is allowed to harden and, if necessary, symbols and Microcapsules coated with a layer of a reactivatable adhesive. 22. The method according to claim 21, characterized in that _t applying the printing ink in such a layer thickness that the image mark after drying 8 / um are strong .. 23. The method according to claim 22, characterized in that the microcapsules are applied to the printing ink while 3o-7o % of the solvents in the printing ink evaporate.