DE19936030A1 - Recording paper with a combination of several 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

The invention relates to a recording paper with a combination of several Security features. The invention further describes with respect to an Si Security feature a method for checking the authenticity of an invention according recording paper.

Recording papers determine everyday life in society and within working life. For use as a transfer, for example forms or checks, diplomas, certificates, leaflets for pharmaceuticals products, lottery tickets, stamps or generally as printouts or copies, the legitimate production of which by the use of the for the purpose of approved and characteristic paper must be demonstrated, different recording solutions have already been used in the past Security paper proposed. In addition to the Authenti With a large number of such papers, the quality check is also of interest to them to protect against subsequent counterfeiting.

For many years, the use of watermarks as a security feature for documents whose authenticity in the form of a passive investigation is to be proven known. Even the use of the same Security threads to be proven have been proposed. DE 195 01 289 A1 provides for heat-sensitive recording paper the use of colored and fluorescent under ultraviolet radiation Fibers added to the paper pulp in a small amount before sheet formation are mixed before, but with significant production  Disadvantages of extended cleaning downtimes on the paper machine that is. At the same time, the committee of paper made in this way can only do very much are recycled to a limited extent due to the syn thesis fibers.

DE 25 18 871 A1 uses coated paper as a security feature discloses that two like substances that have at least one color image ner as an azo compound and at least one dye or pigment ent hold, are applied in or on the backing paper. As part of an acti For the authenticity check, a reagent using Stem pel, felt pen or roller device are applied to the paper, where the substance in or on the carrier paper together with the reagent in Form of color reaction responds. The security feature described in this way can can be combined with a watermark as a further security element.

DE 296 17 106 U1 describes the use of dyes or pig Anthraquinone-based elements known as the only security feature. The se added to the pulp or applied to the paper surface Dyes or pigments can be bled out by acetone treatment brought to prove the authenticity of the paper. EP 0 072 481 B1 sees an admixture of 2- (4'- Amino-3'-sulfophenyl) -6-methyl-benzothiazole-7-sulfonic acid or its salts before, an authenticity check with dilute potassium permangan solution before is seen. As the only security feature, DE 27 47 349 C2 discloses for tamper-proof papers, especially as for to be filled in by hand de Money orders should be used, the use of Py rensulfonic acids or their metal salts in the pulp or on the Pa surface.

To identify mechanical manipulations, for example by Ra dieren, scratching, lifting off labeling with adhesive tape or the like  completed forms are disclosed by DE 298 15 121 U1 for coating ink jet papers a coating color, their pigment mixture from precipitated silica and at least one excitation radiation from the ultraviolet or visible spectral range absorbing absorber pig ment exists.

EP 0 844 097 A1 describes a heat-sensitive recording material known as a first security feature on its back printed latent image made using a fluorescent reagent containing security ink. To form a second safe feature in the form of a waterproof image on the back of the war The sensitive ink contains a sensitive material repellent. The fluores used as pigment or dye Ornamental reagent and security containing the water repellent stinte is contained or dispersed in an aqueous carrier, in addition to this Components can still contain a binder. A disadvantage of this before is the fact that the water-repellent character of the Si ink the arrangement of preprints using the usual printing processes is difficult.

The object of the present invention is for recording pa piere create a combination of several security features, with which to a simple authenticity checks are carried out and which also provides effective protection against attempts at counterfeiting fen, as it were to carry out cross-checks to authenticate ascertainment can be used. At the same time, they should be available making recording papers on the front and back without problems can be provided with so-called preprints.

The above object is achieved with a recording paper according to the preamble of claim 1 by the combination of  at least two of the safety note specified in the characterizing part times.

Numerous studies have shown that: different efficacies of two with one another, which can be seen from Table 1 combined security features

Table 1

When combining the security feature (2) with security feature (5) is the regular or irregular pattern of dye B on the front applied SC layer applied.

Without the invention in the combinations specified below limited by more than two security features have become special pronounced security effects in the following combinations of more than two of the security features specified in claim 1 are shown (1/2/3), (1/2/4), (11215), (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)

When combining more than two security features, the stel lenwise order of the security feature (5) the preferred execution shape.  

By the doping and type of color specified in the subclaims substances (A) as a security feature (1) is both an authenticity check, as it is defined in more detail in the subclaims and what is genuine testing of the recording paper according to the invention is to be understood, as well as the detection of forgeries attempted on records possible.

An irregular pattern formation with regard to the security feature (2) applied dye (B) preferably corresponds to a fine-grained Structure that, in other words, can be called speckling, while the regular pattern is preferably a striped structure corresponds. In daylight, the side exposed to the dye (B) sees opposite to the side intended for recording, viewed with the naked eye slightly colored.

The preferred embodiments of the invention of the dye (B) specified in the subclaims enable, in particular if the dye is water-soluble and is applied without a binder, the solution to the problem of perfect printing on the back by means of flexographic or offset printing, if this is for certain areas of application such as lottery tickets. A suitable application weight is in the range of 0.01 to 40 mg / m ² .

To form the fluorescence in accordance with the security feature (4) setting pulp has become a fluorescent color under UV radiation Styryl-based dye (C) was found to be particularly advantageous because with no discolouration of the paper and the Pa water and material cycle used in the production runs is connected. The procedure for coloring part of the insert zenden pulp is not the subject of the present invention and can be carried out advantageously in which the pulp to be dyed separately in a pulper with water containing dye (C) described above  is dissolved, with a range of 0.03-3% of dye (C) based on has shown the pulp to be treated as suitable. A special one high effectiveness with regard to the authenticity check of the invention ß recording paper is achieved when the fluorescence of the Treatment of the pulp used dye (C) under UV radiation is different from the fluorescence of the dye (B), which leads to the Er generation of the security feature (2) is used. Furthermore, to achieve a high level of effectiveness and one which takes advantage of the security feature (4) Authenticity check a clearly discernible difference in the colorization or degree of lightening of the colored with a dye (C) and / or with an optical brightener treated pulp compared to not or little colored and / or not or little optically brightened remaining adjust the cellulose content.

The mass per unit area of the SC layer forming the security feature (5) is in the range from 1 to 10 g / m ² , preferably in the range from 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 are used as spacers dress. The result of pressure as a reaction of the color formers with the Hue generated in the SC layer is preferably in one Contrast with the color of the SC layer. An only in places training of the security feature (5) representing the SC layer, which is also the detection of counterfeits attempted on records, Special when it turns out to be useful if you with the security  Characteristics (1) and / or (4) is combined, on the one hand the authentizi Simplify the test using the security feature (1) and secondly to visualize the fluorescence of the pulp fibers to effect according to security feature (4).

The combinations of security features according to the invention are preferably used for an inkjet printing paper, in particular for a Inkjet printing paper, which is a receiving layer for inkjet printing having. A further preferred embodiment sees the Invention Combinations of security features in a heat-sensitive recording paper containing sensitive recording layer. All The introduction of a pigment-containing layer is particularly preferred between paper and heat sensitive recording layer. Furthermore it is preferred that a Protective layer is applied.

Among the watermarks mentioned as security feature (3) are in the sense of the invention generated on the paper machine in the wet paper web Eighth watermark, so-called Mo stamped into the damp paper web Latvian or printed markings, so-called pseudo-watermarks, to understand.

Among the azine dyes within the meaning of the present invention are by Pyrazine ring (paradiazine ring) with attached aromatic nuclei to understand labeled dyes.

Preprints are included in the description of the present invention for example by means of flexographic or offset printing, in particular dry or wa teriess offset printing, applied imprints, such as form labels to understand the written form in which the intended Use filling out the form fields, for example using inks  jet printer or thermal printer.

The information given in the description and claims to the surface related mass and wt .-% refer to the "atro" weight, d. H. absolutely dry parts by weight.

Without being restricted to this, within the scope of the present invention the heat-sensitive known from the following writings Recording layers are used: DE 29 29 102 A1; DE 29 37 915 A1; DE 32 37 247 A1; DE 32 42 262.

Without being restricted to this, within the scope of the present invention tion known from the following writings trapping layers are used: A1; DE 32 37 381 A1; EP 0 524 635 A1. EP 0 602 230 A1; EP 0 602 400 A1.

The following examples illustrate the invention without referring to it restrict:

Manufacture of paper webs

In a series of experiments, a mixture (a) of bleached and ground hardwood and softwood pulp with the addition of the usual additives Impacts made in a pulper with a consistency of 3.8%.

In a second pulper, an unground, bleached softwood pulp with the styryl which causes a yellowish fluorescence under UV radiation dye Pergasol F-6G® (Ciba Specialty Chemicals GmbH) for the production of egg ner second mixture (b) treated. A consistency of 2% is used stiffened. There are 0.3% of dye based on the cell to be treated substance (atro) added to the dissolving water.

A mixture (c) is produced from the mixtures (a) and (b) and a paper web (I) having the surface area weight (87 g / m ² ) and the security feature (4) is obtained from it on a Fourdrinier paper machine. 9 parts by weight of the pulp of the mixture (a) 0.1 part by weight of the pulp of the mixture (b) are eliminated.

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

A mixture (b) is added to a fiber mixture (d) dyed with Nigrosin Lackschwarz H® - (azine dye from Bayer AG), which otherwise corresponds to mixture (a). On a Fourdrinier paper machine, a paper web (III) with 87 g / m ² area-related mass, which has the safety features (1) and (4), is produced, with pulp of the mixture (d) of 99.9 parts by weight. 0.1 part by weight of pulp of the mixture (b) is eliminated. The amount of dye added corresponds to 0.05% by weight, based on the pulp of the mixture (s).

A paper web (IV) is produced using the same mixture (e) with a mass per unit area of 87 g / m ² while at the same time using 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 using a watermark-producing egout Using the fiber mixture (d), the safety note becomes more expensive male (1) and (3) having paper web (VI) produced.

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

When using a watermark-producing egout Using the fiber blend (a), security becomes more expensive feature (3) having paper web (VIII).

The paper webs (I) to (VIII) were provided on one side with a starch preparation of 0.5 g / m ² .

Examples 1-4

For the production of heat-sensitive recording papers, the paper webs (I) to (VIII) are first treated on the side opposite the side provided with a starch preparation with an intermediate layer containing an oil-absorbing pigment and then provided with a heat-sensitive recording layer. The paper webs (II), (III), (IV) and (VI) are used to obtain (II ^therm ), (III ^therm ), (IV ^therm ) and (VI ^therm ) designated heat-sensitive recording papers, which are described below as examples 1 to 4 are referred to and contain the safety features listed in Table 2.

Examples 5-7

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

Examples 8-11

The heat-sensitive recording papers produced according to Examples 1 to 4 (II ^therm ), (III ^therm ), (IV ^therm ) and (VI ^therm ) are provided on the back with the dye solution given for Examples 5-7, so that an irregular one Pattern in the manner of a fine-grained structure is created, which extends over the entire surface of the paper web. The heat-sensitive recording papers (II ^{therm + 2} ), (III ^{therm + 2} ), (IV ^{therm + 2} ) and (VI ^{therm + 2} ) obtained in this way have the security features shown in Table 2.

Example 12

The paper web (VII) 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 ^{therm + 2} ) 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), the recording ^papers referred to in Examples 13 to 15 as (II ^tsd ), (III ^tsd ), and (IV ^tsd ) for inkjet printing with those given in Table 3 result security features.

Examples 16 and 17

The recording ^papers (V ^tsd ) and (VI ^tsd ) produced from the paper webs (V) and (VI) are, as indicated for example 12, partially provided with an SC layer on the back. The security features of the recording papers thus produced are given in Table 3.

Example 18

A web of the recording ^paper (VI ^tsd ) is, as indicated for Example 12 ben, additionally treated on the back with a dye solution. The recording ^paper designated as (VI ^{tsd + 2} ) contains the security features given in Table 3.

Table 3

Example 19

Sheets of paper made of one with the security features 1/3/4 the smoothed by means of a smoothing unit installed in the paper machine Paper web IV are to be labeled on both sides by means of inkjet printing of the recording paper for simple applications in the office used.

The same paper is also used for making copies by means of electrophotography graphic process - so-called Xerox process can be used.

Claims (26)

1. Recording paper with a combination of several Sicherheitsmerkma le, characterized in 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) 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 provided for the 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 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 receiving the recording and in which there are acceptors and microcapsules with color formers encapsulated therein, the color images having a color-forming reaction with the acceptors upon printing.

2. Recording paper according to claim 1, characterized in that the pattern formed from the dye (B) fluoresces under UV radiation is decorative. 3. Recording paper according to one of claims 1 and 2, 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 . 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 0.05 to 7.5 mg / m ² . 5. Recording paper according to one of claims 1 to 4, characterized ge indicates that the dye (B) is water-soluble. 6. Recording paper according to one of claims 1 to 5, characterized ge indicates that the dye (B) is applied without a binder. 7. Recording paper according to one of claims 1 to 6, characterized ge indicates that the dye (B) is based on pyrene sulfonate is. 8. Recording paper according to one of claims 1 to 7, characterized ge indicates that the dye (A) in an amount of 0.005 to 0.1 % By weight in the paper, based on the "atro" fiber content is finished. 9. Recording paper according to one of claims 1 to 8, characterized ge indicates that the dye (A) in an amount of 0.01 to 0.03 % By weight in the paper, based on the "atro" fiber content is finished.   10. Recording paper according to one of claims 1 to 9, characterized ge indicates that the dye (A) is an azine or anthraquinone dye is. 11. Recording paper according to one of claims 1 to 10, characterized ge indicates that the fluorescence is colored with the dye (C) ten pulp is colored under UV radiation. 12. Recording paper according to one of claims 1 to 11, characterized ge indicates that the pulp dyed with the dye (C) Annual plants exist. 13. Recording paper according to one of claims 1 to 11, characterized ge indicates that the cellulose dyed with the dye (C) from Na Delwood pulp is made. 14. Recording paper according to one of claims 1 to 13, characterized ge indicates that the pulp is not ground. 15. Recording paper according to one of claims 1 to 14, characterized ge indicates that the paper is based on its pulp content Contains 0.005-3 wt .-% fluorescent pulp. 16. Recording paper according to one of claims 1 to 15, characterized ge indicates that the paper is based on its pulp content Contains 0.05-0.5% by weight fluorescent pulp. 17. Recording paper according to one of claims 1 to 16, characterized in that the area-related mass of the SC layer is between 1 and 10 g / m ² . 18. Recording paper according to one of claims 1 to 17, characterized in that the area-related mass of the SC layer is between 4 and 7 g / m ² . 19. Recording paper according to one of claims 1 to 18, characterized ge indicates that the SC layer is only applied in places. 20. Recording paper according to one of claims 1 to 19, characterized ge indicates that the recording paper is one for the ink jet is intended for the printing process. 21. Recording paper according to one of claims 1 to 20, characterized ge indicates that the recording paper at least on its to Recording page provided a recording layer for the inkjet printing process. 22. Recording paper according to one of claims 1 to 19, characterized ge indicates that the recording paper at least on its to Recording the record provided page a heat sensitive Has recording layer. 23. Recording paper according to claim 22, characterized in that the recording paper between paper and heat sensitive Drawing layer has a pigment-containing intermediate layer. 24. Recording paper according to one of claims 22 or 23, characterized ge indicates that on the heat sensitive recording layer Protective layer is applied.   25. Procedure for checking the authenticity of the recording paper according to ei nem of claims 1, 8, 9 or 10, characterized in that the Surface of the page that is intended for the recording opposite side, with a mixture of a primary alcohol, a secondary alcohol and an acid is wetted. 26. Procedure for checking the authenticity of the recording paper according to An claim 25, characterized in that the wetting by means of a Test pen, sponge, stamp done.