WO2001009435A1 - Recording paper comprising a combination of various security features - Google Patents

Abstract

The invention relates to a recording paper (I) comprising at least two of the following security features (1), (2), (4) and (5), or (II) comprising at least one of the following security features (2), (4), and (5) and at least one of the following security features (1) and (3): (1) a water-insoluble dye (A) which is incorporated into the paper and which bleeds when placed in contact, for example, with an organic solvent; (2) a dye (B) which is applied to the rear side and which becomes fluorescent in daylight when brought into contact with an alkaline substance; (3) a watermark (4) is incorporated into the paper or printed thereon; (4) cellulose which is placed in the paper, is imbued with a dye (C) and/or is treated with an optical brightening agent, and which becomes fluorescent when exposed to UV radiation, and; (5) a layer applied to the rear side, which comprises acceptors and encapsulated microcapsules containing color formers, whereby the color formers enter into a color forming reaction with the acceptors by means of pressure.

Description

 Recording paper with a combination of several security features

The invention relates to a recording paper with a combination of several security features. Furthermore, the invention describes with regard to a security feature a method for checking the authenticity of a recording paper according to the invention.

Recording papers determine everyday life in society and within working life. For applications such as transfer forms or checks, diplomas, certificates, package inserts for pharmaceutical products, lottery tickets, stamps or in general as printouts or copies, the legitimate manufacture of which can be demonstrated by using the characteristic paper approved for this purpose, there have already been various Solutions for recording papers with security features proposed. In addition to checking the authenticity of a large number of such papers, there is also interest in protecting them from subsequent counterfeiting.

The use of watermarks as a security feature for documents, the authenticity of which is to be proven in the form of a passive examination, has been known for many years. The use of security threads to be verified in the same way has also been proposed.

For a heat-sensitive recording paper, DE 195 01 289 A 1 provides for the use of colored fibers which fluoresce under ultraviolet radiation and which are added to the paper pulp in a small amount before the sheet is formed. are mixed before, but this is associated with considerable production disadvantages of prolonged cleaning downtimes on the paper machine. At the same time, the reject of paper produced in this way can only be recycled to a very limited extent due to the synthetic fibers which are noticeable to the naked eye.

DE 25 18 871 A1 discloses as a security feature for coated papers that two substances of the same type, which contain at least one color former as an azo compound and at least one dye or pigment, are applied in or onto the backing paper. In the course of an active investigation, a reagent can be applied to the paper by means of a stamp, felt pen or roller device for authenticity checking, the substance in or on the carrier paper reacting with the reagent in the form of color formation. The security feature described in this way can be combined with a watermark as a further security element.

DE 296 17 106 U 1 discloses the use of dyes or pigments based on anthraquinone as the sole security feature. These dyes or pigments added to the paper pulp or applied to the paper surface can be bled out by acetone treatment in order to demonstrate the authenticity of the paper. EP 0 072 481 B1 provides an admixture of 2- (4 ^' - amino-3'-sulfophenyl) -6-methyl-benzothiazole-7-sulfonic acid or its salts for a counterfeit-proof paper, an authenticity check being provided with dilute potassium permangan solution is. As the only security feature, DE 2747 349 C 2 discloses the use of pyrenesulfonic acids or their metal salts in the paper pulp or on the paper surface for counterfeit-proof papers, which are to be used in particular as payment instructions to be filled in by hand. To identify mechanical manipulations, for example by erasing, scratching, lifting off labeling with adhesive tape or the like on filled-in forms, DE 298 15 121 U 1 discloses a coating color for the coating of inkjet printing papers, the pigment mixture of precipitated silica and at least one excitation radiation from the ultraviolet or visible spectral range absorbing absorber pigment.

EP 0 844097 A1 discloses a heat-sensitive recording material which, as a first security feature, has a latent image printed on its back, produced by means of a security ink containing a fluorescent reagent. To form a second security feature in the form of a waterproof image on the back of the heat-sensitive recording material, the security ink contains a water-repellent. The security ink containing the fluorescent reagent used as pigment or dye and the water-repellent is contained or dispersed in an aqueous carrier which, in addition to these components, may also contain a binder. A disadvantage of this proposal is the fact that the arrangement of preprints by means of the usual printing methods is made more difficult by the water-repellent character of the security ink.

The object of the present invention is to provide a combination of several security features for recording papers, which on the one hand realizes simple authenticity checks and on the other hand provides effective protection against attempts at counterfeiting, which can be used, as it were, to carry out cross-checks to determine authenticity. At the same time, it should be possible to provide the recording papers on the front and back with so-called preprints without any problems. The solution to the above problem is provided by a recording paper with a combination of several security features, wherein at least two of the security features (1) specified below are used as security features (I.),

(2), (4) and (5) or (II.) At least one of the security features (2), (4) and (5) specified below and at least one of the security features (1) and (3) specified below are combined with one another , the security features are:

- (1) a water-insoluble dye (A) which is invisible to the naked eye and is incorporated into the paper and which, when surface-wetted with an organic solvent or an acid, causes a striking coloration at least on the side opposite the side intended for recording

- (2) a dye (B) which is only slightly visible in daylight in the acidic or neutral pH range, which is applied in a regular or irregular pattern to the entire surface of the side opposite the side intended for recording and which is in Contact with an alkaline substance causes a color reaction that leads to a stable color that fluoresces in daylight

- (3) a watermark incorporated or printed on the paper

- (4) introduced into the paper with a dye (C) colored and / or treated with an optical brightener, which is fluorescent under UV radiation

- (5) an SC layer which is applied to the side opposite the side intended for recording and in which acceptors and microcapsules with color formers encapsulated therein are present, the color images having a color-forming reaction with the acceptors upon printing. In the course of numerous investigations carried out, different efficacies of two security features combined with one another were shown in Table 1

Table 1

X: particularly effective combination

O: effective combination

-Φ-: effective combination when the SC layer is applied in places

When the security feature (2) is combined with the security feature (5), the regular or irregular pattern of the dye B is applied to the previously applied SC layer.

In the combination of more than two security features, the application of the security feature (5) in places is the preferred embodiment.

Without the invention being limited to the combinations of more than two security features specified below, particularly pronounced security effects have been shown in the following combinations of more than two of the security features specified in claim 1: (1/2/3), (1/2 / 4), (1/2/5), (1/3/4), (1/3/5), (1/4/5), (2/3/4), (2/3/5 ), (2/4/5), (3/4/5); (1/2/3/4), (1/2/3/5), (1/3/4/5) The doping and type of dyes (A) as security feature (1) specified in the subclaims provide both an authenticity check as defined in the subclaims and what is to be understood as an authenticity check of the recording paper according to the invention, as well as the detection of records attempted forgeries.

An amount of 0.005 to 0.1% by weight incorporated into the paper, based on the "atro" fiber content, in particular an amount of 0.01 to 0.03% by weight, has proven to be suitable for the dye (A). %. An azine or anthraquinone dye can be used as the dye (A).

An irregular pattern formation with regard to the dye (B) applied as a security feature (2) preferably corresponds to a fine-grained structure which, in other words, can be referred to as speckling, while the regular pattern preferably corresponds to a strip-like structure. In daylight, the side exposed to the dye (B), which is opposite the side intended for recording, looks slightly colored when viewed with the naked eye.

The preferred embodiments of the invention of the dye (B) specified in the subclaims, in particular if the dye is water-soluble and applied without a binder, enable the problem of the correct printing on the back by means of flexographic or offset printing to be solved, if this is for certain areas of application, such as for example lottery tickets. A suitable application weight is in the range of a mass per unit area of 0.01 to 40 mg / m ² , in particular in the range of 0.05 to 7.5 mg / m ² . It is further preferred that the pattern formed from the dye (B) is fluorescent under UV radiation. A dye based on pyrene sulfonate has proven to be particularly suitable as dye (B). To form the fluorescence in the pulp to be used according to security feature (4), a styryl-based dye (C) that fluoresces under UV radiation has proven to be particularly advantageous because it does not interfere with daylighting of the paper and the paper machine water and material cycles used in the course of production. The process for coloring a part of the pulp to be used is not the subject of the present invention and can advantageously be carried out by dissolving the pulp to be colored separately in a pulper with water (D) described above, a range of 0.03 - 3% dye (C) based on the pulp to be treated has been found to be suitable. A particularly high effectiveness with regard to the authenticity check of the recording paper according to the invention is achieved if the fluorescence of the dye (C) used for the treatment of the pulp under UV radiation differs from the fluorescence of the dye (B) which is used to generate the security feature (2). is used. Furthermore, in order to achieve a high level of effectiveness of an authenticity check using the security feature (4), there is a clearly recognizable difference in the degree of coloring or lightening of the pulp fraction colored with a dye (C) and / or treated with an optical brightener compared to the non-colored or little colored part and / or adjust the remaining or less optically brightened pulp portion.

A cellulose consisting of annual plants or a softwood cellulose which is preferably unground can be used as the cellulose for the characteristic (C).

The recording paper according to the invention preferably contains, based on its cellulose content, 0.005-3% by weight, in particular 0.05-0.5% by weight, of fluorescent cellulose.

The area-related mass of the SC - forming the security feature (5) - Layer is in the range of 1 to 10 g / m ² , preferably in the range of 4 to 7 g / m ² . A suitable composition of the SC layer is given below, without the invention being restricted to this composition:

20 to 50% by weight of microcapsules, preferably 25 to 40% by weight

20 to 60% by weight of color acceptor, preferably 30 to 45% by weight

8 to 40% by weight of binder, preferably 10 to 25% by weight

5 to 30% by weight spacers, preferably 8 to 20% by weight

Inhibited starch and / or cellulose powder can be considered as spacers. The color tone produced as a result of the action of pressure as a reaction of the color formers with the acceptors in the SC layer is preferably in contrast to the color of the SC layer. A formation of the SC layer representing the security feature (5) only in places, which also enables the detection of forgeries attempted on recordings, has proven to be expedient in particular if it is combined with the security features (1) and / or (4) , on the one hand to simplify the authenticity check using the security feature (1) and on the other hand to make the fluorescence of the pulp It. security feature (4) visible.

The combinations of security features according to the invention are preferably used for an inkjet printing paper, in particular for an inkjet printing paper which has a receiving layer for inkjet printing. Another preferred embodiment provides the combinations of security features according to the invention in the case of a recording paper having a heat-sensitive recording layer. The introduction of a pigment-containing layer between paper and heat-sensitive recording layer is very particularly preferred. Furthermore, it is preferred that a heat sensitive recording layer Protective layer is applied.

A further preferred embodiment provides a recording paper which has a receiving layer for the ink jet printing process at least on its side intended for recording, or which has a heat-sensitive recording layer at least on its side intended for recording and wherein at least two of the security features specified below are used as security features ( 1), (2), (3), (4) and (5) are combined:

- (1) a water-insoluble dye (A) which is invisible to the naked eye and is incorporated into the paper and which, when surface-wetted with an organic solvent or an acid, causes a striking coloration at least on the side opposite the side intended for recording

- (2) a dye (B) which is only slightly visible in daylight in the acidic or neutral pH range, which is applied in a regular or irregular pattern to the entire surface of the side opposite the side intended for recording and which is in Contact with an alkaline substance causes a color reaction that leads to a stable color that fluoresces in daylight

- (3) a watermark incorporated or printed on the paper

- (4) introduced into the paper with a dye (C) colored and / or treated with an optical brightener, which is fluorescent under UV radiation

- (5) an SC layer which is applied to the side opposite the side intended for recording and in which acceptors and microcapsules with color formers encapsulated therein are present, the color images having a color-forming reaction with the acceptors when printed.

As a method for checking the authenticity of a security feature 1 pointing recording paper according to the invention - possibly in accordance with the embodiments specified in subclaims 8 to 10 - a method has proven to be suitable in which the surface of the side opposite to the side intended for recording has been mixed with a mixture of a primary alcohol, a secondary alcohol and an acid is wetted. The wetting is preferably carried out using a test pen, sponge or stamp.

For the purposes of the invention, the watermarks mentioned as security feature (3) are to be understood as real watermarks produced on the paper machine in the wet paper web, so-called moles imprinted on the wet paper web or printed markings, so-called pseudo watermarks.

Azine dyes for the purposes of the present invention are to be understood as dyes characterized by the pyrazine ring (paradiazine ring) with attached aromatic nuclei.

In the description of the present invention, preprints are to be understood, for example, by means of prints applied by means of flexographic or offset printing, in particular dry or waterless offset printing, such as, for example, form inscriptions, in which, when used in the intended manner, the filling in of the form fields, for example using an inkjet printer or thermal printer.

The statements made in the description and claims regarding the area-related mass and weight% relate to the “atro” weight, that is to say absolutely dry weight fractions.

The recording papers according to the invention can be used in addition to the five said security features according to claim 1 with their preferred design variants corresponding to all sub-claims also have further security features.

Without being restricted to this, the heat-sensitive recording layers known from the following documents can be used in the context of the present invention: DE 2929 102 A1; DE 2937 915 A1; DE 32 37 247 A1; DE 3242262 A1.

Without being limited to this, the ink jet print receiving layers known from the following documents can be used within the scope of the present invention: DE 32 37 381 A1; EP 0 524635 A1; EP 0 602230 A1; EP 0 602400 A1.

The following examples illustrate the invention without restricting it:

Production of paper webs:

In the course of a series of tests, a mixture (a) of bleached and ground hardwood and softwood cellulose is produced with the addition of the usual additives in a pulper with a consistency of 3.8%.

In a second pulper an unrefined bleached softwood kraft pulp with the effecting under UV irradiation, a yellowish fluorescence styryl dye is treated Pergasol F-6G ^® (Ciba Specialty Chemicals GmbH) to prepare a second mixture (b). A consistency of 2% is set. 0.3% of dye based on the pulp to be treated (dry) is added to the dissolving water.

A mixture (c) is produced from the mixtures (a) and (b) and a paper web (I) with the safety feature (4) and 87 g / m ² area-related mass, based on 99.9 Parts by weight of the pulp of the mixture (a) 0.1 parts by weight of the pulp of the mixture (b) are omitted.

A paper web (II) is produced using the same mixture (c) with a mass per unit area of 87 g / m ² while simultaneously using a watermark-producing egoutteurs. This paper web (II) has the security features (3) and (4).

A fiber mixture (d) dyed with Nigrosin Lackschwarz H ^® - (azine dye from Bayer AG) - which otherwise corresponds to mixture (a), is added to mixture (b) to produce mixture (e). On a fourdrinier The paper machine is then used to produce a paper web (III) having the safety features (1) and (4) and having a mass per unit area of 87 g / m ² , in which the pulp of the mixture (d) 0.1% by weight per 99.9 parts by weight. Parts of the pulp of the mixture (b) are eliminated. The amount of dye added corresponds to 0.05% by weight, based on the pulp of the mixture (e).

A paper web (IV) is produced using the same mixture (e) with a mass per unit area of 87 g / m ² with the simultaneous use of a watermark-producing egoutteurs. This paper web (IV) has the security features (1), (3) and (4).

Using only the fiber mixture (d), a paper web (V) with 87 g / m ² area-related mass is produced on a Fourdrinier paper machine with the security feature (1).

When simultaneously using an egoutteur producing a watermark, a paper web (VI) having the security features (1) and (3) is produced using the fiber mixture (d).

Using only the fiber mixture (a), paper web (VII) with 87 g / m ² area-related mass is produced on a Fourdrinier paper machine.

When simultaneously using an egoutteur producing a watermark, a paper web (VIII) having the security feature (3) is produced using the fiber mixture (a).

The paper webs (I) to (VIII) are provided on one side with a starch preparation of 0.5 g / m ² . Examples 1-4:

To produce heat-sensitive recording papers, the paper webs (I) to (VIII) are first provided with an intermediate layer containing an oil-absorbing pigment on the side opposite the side provided with a starch preparation and then provided with a heat-sensitive recording layer. The paper webs (II), (III), (IV) and (VI) ^{thus give rise to the} heat-sensitive recording ^papers designated (H ^therm ), (III ^thβrm ), (IV ^{, h} " ^πn ) and ( ^{VI therm} ). The following are the heat-sensitive recording ^papers (ll ^therm ), ( ^{lll thβrm} ), (ix " ⁷¹ ) and (vl ^therm ) are referred to as Examples 1 to 4. They contain the security features listed in Table 2.

Examples 5-7:

The heat-sensitive recording ^papers (I ^therm ), (V ^thwn ) and (Vlll ^therm ) obtained from paper webs I, V and VIII are provided on the side provided with a starch preparation with an aqueous solution of a pyrene sulfonate-based dye in such a way that an irregular pattern arises in the manner of a fine-grained structure that extends over the entire surface of this paper web side. 3.5 mg / m ^{2 are} applied. The heat-sensitive recording ^papers obtained in this way are referred to as Examples 5, 6 and 7 with (| ^{therm + 2} ), (V ^{hemι + 2} ) _and (Vlll ^{therm + 2} ) and have the security features listed in Table 2.

Examples 8-11:

The heat-sensitive recording ^papers (II ^thβrm ), (III ^therm ), (IX ™) and (VI ^therm ) produced according to Examples 1 to 4 are provided on the back with the dye solution given for Examples 5-7, so that an irregular pattern in the type of fine-grained structure that extends over the entire surface of the paper web. The war sensitive recording paper (ll ^{thβ, * 2} ) _I (lll ^{therm + 2} ), (iv * ^{wm + 2} ) and

(V rιItherm + 2) have the security features shown in Table 2.

Example 12:

The paper web (Vll ^thβr ) provided with a heat-sensitive recording layer is ^partially provided on the back with an SC layer with an application ^weight of 5 g / m ² and then over the entire area with the dye solution ^specified in Examples 5-7. The heat-sensitive recording paper designated as (VII ¹ therm + 2 + 5) contains the security features shown in Table 2.

Table 2

Table 2 continued

Examples 13-15:

For the production of recording papers for ink jet printing, the paper webs (II) to (VI) and (VIII) are provided on one side with a receiving layer for ink jet printing. From the paper webs (II), (III) and (IV) are the recording ^papers designated as Examples 13 to 15 for inkjet printing (ll ^tsd ), ( ^{lll tsd} ) and (l \ / ^sd ) with the security ^features given in table 3.

Examples 16 and 17

The recording ^papers for the inkjet printing (V ^sd ) and (Vl ^tsd ) produced from the paper webs (V) and (VI) are, as indicated for example 12, lines 1-3, applied to the back with an SC layer in places. The security ^{features of the} recording ^papers produced in this way and designated with (V * ^{sd + 5} ) and (Vl ^{tsd + 5} ) are given in Table 3.

Example 18:

A web of the recording ^paper (Vl ^tsd ), as indicated for example 12, is applied to the back both in places with an SC layer and additionally with a dye solution according to examples 5-7 over the entire surface. The ^{recording paper} designated as (Vl ^{tsd + 2 + 5} ) contains the security features given in Table 3.

Example 19:

A web of the recording paper (Vlll ^tsd ), as indicated for example 12, is applied to the back both in places with an SC layer and additionally with a dye solution according to examples 5-7 over the entire surface. The recording ^paper designated as (Vlll ^{tsd + 2 + 5} ) contains the security features given in Table 3. Table 3

Example 20:

Paper sheets produced from a paper web IV having the security features 1/3/4 and smoothed by means of a smoothing unit installed in the paper machine are used as recording paper to be inscribed on both sides by means of inkjet printing for simple application areas in office operations.

The same paper can also be used for the production of copies by means of electrophotographic processes - the so-called Xerox process.

Claims

Patent claims 1. Recording paper with a combination of several security features, characterized in that as security features (I.) at least two of the security features specified below (1), (2), (4) and (5) or (II.) at least one of the security features specified below (2), (4) and (5) and at least one of the following Security features (1) and (3) are combined with one another, the security features being: - (1) a water-insoluble dye (A) that is invisible to the naked eye and incorporated into the paper, which, when the surface is wetted with an organic solvent or an acid, causes a noticeable color at least on the side opposite the side intended for recording - (2) a dye (B) which is only slightly visible in daylight in the acidic or neutral pH range and which is applied in a regular or irregular pattern to the entire surface of the side opposite the side intended for recording and which is in Contact with an alkaline substance undergoes a color reaction that results in a permanent color that fluoresces in daylight - (3) a watermark incorporated or printed into the paper - (4) pulp introduced into the paper, colored with a dye (C) and/or treated with an optical brightener, which is fluorescent under UV radiation, - (5) an SC layer which is applied to the side opposite the side intended for recording the recording and in which acceptors and microcapsules with color formers encapsulated therein are present, the color images entering into a color-forming reaction with the acceptors upon pressure. Recording paper, characterized in that the recording paper has a receiving layer for the inkjet printing process at least on its side intended for recording the recording or a heat-sensitive recording layer at least on its side intended for recording the recording, and that as security features at least two of the security features specified below (1) , (2), (3), (4) and (5) are combined with each other: - (1) a water-insoluble dye (A) that is invisible to the naked eye and incorporated into the paper, which, when the surface is wetted with an organic solvent or an acid, causes a noticeable color at least on the side opposite the side intended for recording - (2) a dye (B) which is only slightly visible in daylight in the acidic or neutral pH range and which is applied in a regular or irregular pattern to the entire surface of the side opposite the side intended for recording and which is in Contact with an alkaline substance undergoes a color reaction that results in a permanent color that fluoresces in daylight - (3) a watermark incorporated or printed into the paper - (4) pulp introduced into the paper, colored with a dye (C) and/or treated with an optical brightener, which is fluorescent under UV irradiation - (5) an SC layer which is applied to the side opposite the side intended for recording the recording and in which acceptors and microcapsules with color formers encapsulated therein are present, the color images entering into a color-forming reaction with the acceptors upon pressure. 3. Recording paper according to one of claims 1 or 2, characterized in that the pattern formed from the dye (B) is fluorescent under UV irradiation. 4. Recording paper according to one of claims 1 to 3, characterized in that the dye (B) is applied with a mass per unit area in the range of 0.01 to 40 mg/m ² . 5. Recording paper according to one of claims 1 to 4, characterized in that the dye (B) is applied with a mass per unit area in the range of 0.05 to 7.5 mg/m ² . 6. Recording paper according to one of claims 1 to 5, characterized in that the dye (B) is water-soluble. 7. Recording paper according to one of claims 1 to 6, characterized in that the dye (B) is applied without a binder. 8. Recording paper according to one of claims 1 to 7, characterized in that the dye (B) is one based on pyrenesulfonate. 9. Recording paper according to one of claims 1 to 8, characterized in that the dye (A) is incorporated into the paper in an amount of 0.005 to 0.1% by weight, based on the “atro” fiber content. 10. Recording paper according to one of claims 1 to 9, characterized in that the dye (A) is in an amount of 0.01 to 0.03 Weight percent is incorporated into the paper, based on the “atro” fiber content. 11. Recording paper according to one of claims 1 to 10, characterized in that the dye (A) is an azine or anthraquinone dye. 12. Recording paper according to one of claims 1 to 11, characterized in that the fluorescence of the pulp colored with the dye (C) is colored under UV irradiation. 13. Recording paper according to one of claims 1 to 12, characterized in that the pulp colored with the dye (C) consists of annual plants. 14. Recording paper according to one of claims 1 to 12, characterized in that the pulp colored with the dye (C) consists of softwood pulp. 15. Recording paper according to one of claims 1 to 14, characterized in that the pulp is unground. 16. Recording paper according to one of claims 1 to 15, characterized in that the paper contains 0.005 - 3% by weight of fluorescent pulp based on its pulp content. 17. Recording paper according to one of claims 1 to 16, characterized in that the paper contains 0.05 - 0.5% by weight of fluorescent pulp based on its pulp content. 18. Recording paper according to one of claims 1 to 17, characterized in that the mass per unit area of the SC layer is between 1 and 10 g / m ² . 19. Recording paper according to one of claims 1 to 18, characterized in that the mass per unit area of the SC layer is between 4 and 7 g / m ² . 20. Recording paper according to one of claims 1 to 19, characterized in that the SC layer is only applied in places. 21. Recording paper according to one of claims 1 and 3 to 20, characterized in that the recording paper is a paper intended for the inkjet printing process. 22. Recording paper according to one of claims 1 and 3 to 21, characterized in that the recording paper has a receiving layer for the inkjet printing process at least on its side intended to receive the recording. 23. Recording paper according to one of claims 1 and 3 to 20, characterized in that the recording paper has a heat-sensitive recording layer at least on its side intended for receiving the recording. 24. Recording paper according to one of claims 2 or 23, characterized in that the recording paper has a pigment-containing intermediate layer between the paper and the heat-sensitive recording layer. 25. Recording paper according to one of claims 2, 23 or 24, characterized in that a protective layer is applied to the heat-sensitive recording layer. 26. Method for checking the authenticity of the recording paper according to one of claims 1, 2, 9, 10 or 11, characterized in that the surface of the side which is opposite the side intended for recording the recording is treated with a mixture of a primary alcohol, a secondary Alcohol and an acid is wetted. 27. Method for checking the authenticity of the recording paper according to claim 26, characterized in that the wetting takes place using a test pen, sponge, stamp. CHANGED REQUIREMENTS [received by the International Bureau on December 29, 2000 (12/29/00); original claims 22 and 23 deleted; original claims 2 amended; original claims 24 - 27, renumbered as claims 22 - 25; all other claims unchanged (5 pages)] Patent claims 1. Recording paper with a combination of several security features, characterized in that as security features (I.) at least two of the security features specified below (1), (2), (4) and (5) or (II.) at least one of the security features specified below (2), (4) and (5) and at least one of the following Security features (1) and (3) are combined with one another, the security features being: - (1) a water-insoluble dye (A) that is invisible to the naked eye and incorporated into the paper, which, when the surface is wetted with an organic solvent or an acid, causes a noticeable color at least on the side opposite the side intended for recording - (2) a dye (B) which is only slightly visible in daylight in the acidic or neutral pH range and which is applied in a regular or irregular pattern to the entire surface of the side opposite the side intended for recording and which is in Contact with an alkaline substance undergoes a color reaction that results in a permanent color that fluoresces in daylight - (3) a watermark incorporated or printed into the paper - (4) pulp introduced into the paper, colored with a dye (C) and/or treated with an optical brightener, which is fluorescent under UV radiation, - (5) an SC layer which is applied to the side opposite the side intended for recording the recording and in which acceptors and microcapsules with color formers encapsulated therein are present, the color images entering into a color-forming reaction with the acceptors upon pressure. . Recording paper according to claim 1, characterized in that the recording paper has a receiving layer for the inkjet printing process at least on its side intended to receive the recording or a heat-sensitive recording layer at least on its side intended to receive the recording. 3. Recording paper according to one of claims 1 or 2, characterized in that the pattern formed from the dye (B) is fluorescent under UV irradiation. 4. Recording paper according to one of claims 1 to 3, characterized in that the dye (B) is applied with a mass per unit area in the range of 0.01 to 40 mg/m ² . 5. Recording paper according to one of claims 1 to 4, characterized in that the dye (B) is applied with a mass per unit area in the range of 0.05 to 7.5 mg/m ² . 6. Recording paper according to one of claims 1 to 5, characterized in that the dye (B) is water-soluble. 7. Recording paper according to one of claims 1 to 6, characterized in that the dye (B) is applied without a binder. 8. Recording paper according to one of claims 1 to 7, characterized in that the dye (B) is one based on pyrenesulfonate. . Recording paper according to one of claims 1 to 8, characterized in that the dye (A) is incorporated into the paper in an amount of 0.005 to 0.1% by weight, based on the “atro” fiber content. 10. Recording paper according to one of claims 1 to 9, characterized in that the dye (A) is incorporated into the paper in an amount of 0.01 to 0.03% by weight, based on the “atro” fiber content _I . 11. Recording paper according to one of claims 1 to 10, characterized in that the dye (A) is an azine or anthraquinone dye. 12. Recording paper according to one of claims 1 to 11, characterized in that the fluorescence of the pulp colored with the dye (C) is colored under UV irradiation. 13. Recording paper according to one of claims 1 to 12, characterized in that the pulp colored with the dye (C) consists of annual plants. 14. Recording paper according to one of claims 1 to 12, characterized in that the pulp colored with the dye (C) consists of softwood pulp. 15. Recording paper according to one of claims 1 to 14, characterized in that the pulp is unground. 16. Recording paper according to one of claims 1 to 15, characterized in that the paper contains 0.005 - 3% by weight of fluorescent pulp based on its pulp content. 17. Recording paper according to one of claims 1 to 16, characterized in that the paper contains 0.05 - 0.5% by weight of fluorescent pulp based on its pulp content. 18. Recording paper according to one of claims 1 to 17, characterized in that the mass per unit area of the SC layer is between 1 and 10 g / m ² . 19. Recording paper according to one of claims 1 to 18, characterized in that the mass per unit area of the SC layer is between 4 and 7 g / m ² . 20. Recording paper according to one of claims 1 to 19, characterized in that the SC layer is only applied in places. 21. Recording paper according to one of claims 1 and 3 to 20, characterized in that the recording paper is a paper intended for the inkjet printing process. 22. Recording paper according to one of claims 2 or 20, characterized in that the recording paper has a pigment-containing intermediate layer between the paper and the heat-sensitive recording layer. 23. Recording paper according to one of claims 2 to 20 or 22, characterized in that a protective layer is applied to the heat-sensitive recording layer. 24. Method for checking the authenticity of the recording paper according to one of claims 1, 2, 9, 10 or 11, characterized in that the surface of the side which is opposite the side intended for recording the recording is treated with a mixture of a primary alcohol, a secondary Alcohol and an acid is wetted. 25. Method for checking the authenticity of the recording paper according to claim 24, characterized in that the wetting takes place using a test pen, sponge, stamp.