DD300550A5 - Counterfeit-proof paper - Google Patents

Abstract

The invention relates to a forgery-proof paper, its manufacture and use. It has set itself the task to produce counterfeit-proof paper, which restricts the further misuse of attempted or made falsification as far as possible or makes impossible, but still allows proof of identity. In accordance with the present invention, the object has been achieved by providing the forgery-proof paper with at least one chemically reactive, different color reactive and fluorescent reagent. The reagent used is * which, as a one-component system, combines several advantages of the safety technology. The paper of the present invention is used for banknote, specialty, value, document and other security papers. forgery; Miszbrauch; Identitaetsnachweis; Reagent; component system; Security systems; Security papers}

Description

Field of application of the invention

The invention relates to a tamper-proof paper, in particular one containing at least one chemically reactive fluorescent dye reacting in different colors and a preparation and use.

Characteristic of the known state of the art

It is well-known that high value special, value, value, document and other security papers should be so arranged that on the one hand their falsification, imitation and / or falsification as well as their abuse is difficult, on the other hand o.g. Changes, changes and / or adjustments can be recognized easily and quickly, and evidence of this remains irreversible.

-2- 30055J

In the current state of the art, it is increasingly necessary to protect against counterfeiting, falsification and / or misuse of font, paces, stamps and / or special information on hand and / orier typewritten or printed special papers and officers documents in payment, travel as well as to produce documents of the security organs significantly secured Cpeziaipapiero and bring to use. To solve this problem, numerous technical proposals have already been developed and specified. The previous solutions sina considered significant in their specific type and in itself, however, have in the form of their use, their handling or their handling and their application disadvantages.

Known are the functional protection of special papers by incorporation of genuine and / or spurious watermarks, security threads, relief structures; the sensitization against chemical shaving with oxidative and reductive acting substances and against alkalis and / or acids by specific security pressures.

According to JE-AS 1283857 and SE-PS 203107, methods for generating b »w are known. for affixing chemical watermarks and papers.

Nebulae GP B 42 D / 242 224-8 is known for the mottling of papers. Another type of protection against counterfeiting, falsification and / or misuse is the anti-mechanically or chemically active agent. Here, the protection against various "ink death" products are known, which consist of an oxidizing and / or a reducing agent.These means destroy the paper sizing some of the "and make it difficult to re-inscribe the treated site.The use of reducing agent responsive Reagents are according to GP D 21 H / 292893-8 bek'n.ii. Also known is the use of Blanchetten by the GP D 21 H / 317049-3.

US Pat. No. 2,445,586 and DE-PS 856842 use colored acid-base indicators such as phthaleins and bleachphthaleins, which are associated with the use of expensive paper technologies, since such pH indicators can be found in water or possibly in papermaking and surface treatment used aqueous compositions are insoluble or quasi insoluble. They must be solubilized with organic solvents, where: in the treatment of paper, there are great risks of ignition and explosion, as well as the risk of toxic damage and environmental pollution, as well as a reduction in the effectiveness of the fiber-based sizing agent. An alternative is to disperse such dyes adjacent or independently with surfactants. In this case, the disadvantage occurs that the gluing of the sheet to which these dyes contained dispersion is applied, is deteriorated, or that unintentionally "and partially uncontrollable side reactions can accumulate with other Sicherungsmittüln contained in the fiber structure.

According to FR-PS 806805 and BE-PS 523251 are specified as securing agents reagents which fluorescence 'vie eosin, rhodamine and flavins. The use of such reagents also requires the use of special technologies (Gautschen and imprinting, especially when using a composition with one of the reagents mentioned). German Offenlegungsschrift No. 2,747,349 discloses the use of fluorescent reagents which exhibit high water solubility in a wide pH range, are readily processible in terms of paper technology and have the ability, under the influence of ink erasers and weakly alkaline agents, to instantly fluoresce in daylight and at the same time develop stable coloration (based on Pyrensulfuosäuren and their metal salts).

Also known is the use of solvent dyes which leave significant dyeings when dipped with solvents. These dyes are known to be non-excitable by light of wavelength 220-400nm and thus not significantly detectable.

Object of the invention

The aim of the invention is a forgery-proof paper, which is exactly identifiable in immediate and / or Tiofenkontrollen only by using special solvents and / or acids and / or using light of specific wavelengths. Thus, the misuse of this special paper is severely restricted or made impossible and / or the special paper loses its authenticity and / or identification and / or information. The hekannten lack of previous backup methods should be excluded and / or extended by a safe variant.

Explanation of the essence of the invention

The object of the invention has been found to produce counterfeit-proof paper, which restricts the further abuse nacli attempted or vorgs ^ mmener forgery waitestgehend or impossible η 3cht. Another object is that the special paper permits proof of identity by using securing means which combine several advantages of the security technique.

The object is achieved according to the invention by producing special papers which contain at least one chemically reactive, differently colored reactive and fluorescent reagent on the surface and / or in the paper pulp, which are used in solid and / or dispersed and / or specifically dissolved form is both as a solvent dye with very high detection sensitivity in daylight and UV light reactive and chemically reactive to acids, gases and oxidants and thus as a one-component system several advantages of the fuse technology, in contrast to other Sicherurigsmethoden, in itself. As a chemically reactive Rnagens according to the invention 4-Dicyanurmethyliden-, 6- (4'-N, N-dimethylamino-styrene) -2methy! -4H-pyran mitForrviel:

NC CN

'3

put to use.

This reagent is manufactured in the GDR by its own method and used only as a laser dye. Surprisingly, it has been found that the reagent previously used only as l.aserfarbstoff reagent

(Import release) for the specific purpose of securing and sensitizing special paperon can be used. It is not known that such a reagent is used for the significant hedging purposes.

Our own investigations have shown that 4-dicyanomethylidene, 6- (4'-N, N-dimothylamino-styrene) -

2-methyl-4H-pyran

is compatible with solutions and dispersions of the special paper impregnation and / or surface sizing agents used in the paper industry, as well as the fiber, fill, size and binder materials contained in the sheet structure, and does not undergo any visible reactions.

It has also been found that this reagent is compatible with previously used sensitizers and

therefore is in Einsotzbar in combinations and thus the previously viewed more valuable. Solvent dyes only have to be brought into use.

Thus, this compound offers itself as a sensitizer and / or identifier compared to conventionally used Oxidizing and reducing agents that are used as an ink extinguisher especially for use? be brought, as well as against acids and Bases as well as special solvents in special paper production both in the surface impregnation ..: ig

and / or surface sizing as well as in the pulp and / or in special printing, wherein the use of the reagent in a solid, dispersed or specifically dissolved form took place.

Furthermore, according to the invention, that the reagent durcli metered mixing and / or admixture shortly after grinding

or shortly before and / or during the sheet forming process at fabric densities of 3.5 to 5.5% and / or fabric densities of 0.2 to 0.5%, on the order of 0.001 to 0.055%, respectively, added to atro pulp and / or by special Combination with a balanced mixing ratio with natural and / or synthetic polymers in the pH range 4.5-6.5 in aqueous dispersion, the polymers serving as significant protective coatings and / or protective colloids of this reagent over other reactive systems. In this case, the addition takes place in the order of 0.001-0.05% depending on the desired effect, based on atro impregnating or surface substances.

The reagent may also be prepared using conventional printing techniques, taking into account its specific reactions

to solvents when printing the special paper «}.

According to the invention, furthermore, the reagent can be used in dissolved form, preferably in acetic acid

of the same order of magnitude of 0.001-0.05% based on atro pulp or dry substance of the surface size or

Impregnation. Of significant advantage of the use of this reagent is that it as a one-component system several advantages of Combined safety technology, such as reaction against oxidation and reducing agents, solvents, acids and bases

as well as visible in daylight and UV light reactions.

A'isfQhrungsbelspiele The invention i'Cil be explained in more detail below with reference to three examples. Execution game t

When producing a special paper having a basis weight of 85 g / m ² , after the material-water mixture has been ground to a stock consistency of 5% in the milling unit, 0.0025% air 4-dicyanomethylidene, 6- {4'-N, N -dimethybminostyrol) -2mt, _l nyl-4H-pyran (DCM) added based on absolutely dry fiber material of the special paper and about 10 minutes thoroughly mixed by moving the Stofi-water mixture in the grinding unit no load.

After dilution of the substance-water mixture to 0.2% consistency, the sheet formation takes place on a rotary screen paper machine. When viewed under UV light, the DCM shines particle-like strongly in the color orange-red.

On staining with acid (e.g., acetic acid), a spot well visible in daylight appears orange-red, which fluoresces strongly in this color under UV light.

When dabbing with oxidizing agents (eg sodium hypochlorite), a bluish spot appears under UV light. Dabbing with chlorinated methanes produces a variety of orange-yellow spots in daylight that fluoresce under UV light

 When dabbing with bases (eg caustic soda), a bluish-white spot appears under UV light.

Embodiment 2 A special paper with a surface area of 95 g / m ² passes through the pre-dryer section of the e'rier paper machine

a Oberflächenleimbad out, consisting of a coordinated mixing ratio of z. B. 65% Amyzell, 13% of a copolymer based on acrylic ester free of plasticizers and solvents, 3%

Hydrochloric acid for pH adjustment to pH 4.5 to 6.5, the 0.003% DCM be added based on atro Solids content of the surface sizing. The paper sized with this surface size passes through the after-dryer section of the paper machine. This paper will

provided with special information through printing.

In the case of attempted counterfeiting using solvents, acids, bases and / or oxidants, remain in place

of the attempted attack in daylight and / or UV light clearly visible stains back, described in accordance with Example 1, which make a false and / or falsification attempt made significantly visible and exclude further abuse of this special paper.

Embodiment 3 When producing a special paper with a basis weight of 80g / m ² , after grinding the substance / water Mixture to a substance density of 4.5% in the milling aggregate 0.02% DCM dissolved in acetic acid, based on atro pulp of Special paper, added. After further processing according to embodiment 1, a light pink colored fiber structure is obtained in daylight, which

When dabbing with acids, bases, solvents, oxidizing agents produces clearly visible reactions, wherein im

Contrary to the Ausführungsboispielen 1 and 2 under UV light at alkaline and oxydativam attack a clearly visible Blue coloration occurs.

Claims (6)

1. Anti-counterfeit paper, especially one containing at least one kind chemically reactive, differently colored reacting andfluores.'ijionden reagent on the surface and / or in dr- pulp regularly and / or placed distributed or arranged in disperse and / or dissolved form , characterized gekennzeic! iet that as a reactive system, the compound 4-dicyanomethylidene-6 (4'-N, N-dimethylamino-styrene) - ^ ethyl ^ H-pyran having the formula: contains that inclusion medium and reagent trigger a coordinated reactive system immediately and / or later on exposure to reactive media and / or energy of defined wavelengths both as individual reactions and in combination reactions on and / or different levels and / or other backup variants of the overall system contained therein, the serves as a reversible and / or irreversible proof of counterfeiting, attempted forgery, invasion, attack and / or falsification and / or identification on, for and / or against counterfeit and / or falsified special paper. 2. Anti-counterfeit paper according to claim 1, characterized in that the reagent is used in a special combination with coordinated mixing ratio with natural and / or synthetic polymers in the pH Befeich 4.5-6.5 in aqueous dispersion used as the significant Protective coatings and / or protective colloids of this reagent with respect to other reactive systems contained serve so that it is compatible with these and does not react with these or no disturbing or visible reactions. 3. tamper-proof paper according to claim 1 and 2, characterized in that the reagent before its use with a suitable solvent, advantageously mixed with acetic acid, and added in this dissolved form the fiber structure. 4. Anti-counterfeit paper according to claim 1 to 3, characterized in that the reagent is bound to and / or other security forms such. As mottled fibers, Blanchetten etc., the fiber structure is added. 5. A process for the preparation of the counterfeit-proof paper according to claims 1 to 4, characterized in that the chemically reactive, different colored and fluorescent reagent at and / or after the paper production regularly and / or placed distributed or arranged by metered sprinkling and / or impregnation in the paper pulp and / or in the fiber structure and / or applied by application to the Papierobarfläche and / or applied by a corresponding paper surface treatment, wherein the use of the reagent can be dry, disperse and / or specifically dissolved form and / or bound to and / or in other security forms is added to the fiber structure. 6. Use of the counterfeit-proof paper according to claims 1 to 5 for notes, special, value, value, document and other security papers.