Printing ink for protection of products against falsification

FIELD: printing arts; printing inks for securities; protection against falsification.

SUBSTANCE: proposed printing ink contains pigment possessing protective properties, binder and thinner; pigment contains ultra-dispersed powder of rare-earth ferrite-garnet selected from group including Y3Fe5O12, Ln3Fe5O12, YxLn3-xFe5O12, where Ln is rare-earth element, 0≤x≤3, Y3-xBixFe5O12, where 0≤x≤2 with sizes of crystallites not exceeding 100 nm in the amount not exceeding 85% of weight of ink. Optical characteristics are extended within 380-750 nm and infrared transparence is increased within 0.74-3.0 mcm.

EFFECT: enhanced identification due to magnetic properties.

8 dwg, 1 tbl, 3 ex

 

The invention relates to the printing industry, namely, printing inks, and can be used for printing securities, in particular banknotes, shares, excise stamps, letterhead, bond books, packaging of commercial products, etc. by known methods of printing to protect them from fraud (forgery).

There are many ways to protect products from counterfeiting. They are implemented in the following areas:

- protection of the base paper;

- the use of special types of printing;

- use special paints;

- create a specific design using graphic elements, protection from a color copying;

- creation and pressing holograms.

The above methods of protection securities, in particular banknotes, shares, excise stamps, letterhead, bond books, packaging of commercial products, etc. from forgery assume mainly visual inspection assessment of authenticity. However, when processing a large volume of securities (conduct emission-cash transactions), as well as for accounting and control of various documents (passport blanks, bond books, etc. are widely used read by machines signs of protection, and typical methods for determining the authenticity include the measurement of specific properties of materials (communicated to the fair, optical, electrical conductivity) To create a protective element is typically used any material from one physical characteristic, and therefore to increase the reliability of protection securities, in particular banknotes, shares, excise stamps, letterhead, bond books, packaging of commercial products, necessary set of several protective elements.

Known method of applying a magnetic label with magnetic pencil (No. 374016, USSR, 1969). The method consists in the production of the composite magnetic mixtures based on barium ferrite BaFe12O19(75-90%), particle size of from 1 to 5 μm, and filling this mixture, low-capacity type pen.

The disadvantage of this method is that the magnetic label is applied to the document manually, which imposes significant restrictions on its use on a large scale.

Known methods of protection securities against forgery by using printing ink due to the inclusion in its membership of marking particles having different physical properties, namely infrared (WO 98/28374, PCT/EP 97/07009, 1999; JP 3223730 B2, A, 1994; EN 2149457 C1, 1999), fluorescent (GB 2231572 A, 1990), magnetic (EN 2129579 C1, 1999; GB 2079506, 1982; GB 2168711, 1986). In the famous inventions of the marking particles are part of the existing tonality of the printing ink, and concentric the I is from 0,0009% to 10% by weight of the paint. This in turn imposes limitations on the technological capabilities of such printing inks in terms of using them to create an independent graphic colour pictures of the securities.

There is a method of protection using labels from a material comprising a mixture of at least two stable isotopes with different mass numbers (EN 2150749 C1; EN 95103037, 1997). The disadvantage of this method of protection securities is its high cost and to some extent not security.

Known methods of identifying securities with protective magnetic filaments (WO 9635586 A1, 1998). It has a plastic substrate on which is deposited a soft magnetic material. This magnetic material generates a signal or series of signals in the band of the survey, produced by the detection system to determine read or product identification at a distance. The disadvantage of this method protect products from counterfeiting is the high cost of products, systems to identify these products, as well as the possibility of simulation of the magnetic metallic threads in fake documents and securities.

Closest to the proposed typographical paint to protect products from counterfeiting and accepted as a prototype of the invention is RU # 2160928 (20.12.2000,), where considered valuable paper many of the elements that protection is. In the invention lists the compositions used in printing ink, and the pigment are examples of mixtures of materials with known properties, which are developed and used typical methods for determining the authenticity of securities, namely, fluorescence, magnetism, phosphorescence, light absorption of ultraviolet, visible, infrared, and each and every element of protection is its composition of printing ink. Thus, a security must have the necessary set of several protective elements. This in turn requires the use of a particular area on the securities for their accommodation, and for some signs of protection and a certain place. As regards specified in the invention of the magnetic compositions, all of which are oxides or mixtures of oxides. Possessing magnetic properties, at the same time, these typographic compositions have the main disadvantage, namely, black color or dark brown, which allows their use only to print black or close to black fragments, such as a room or a small label on the securities. This limits the use of protective magnetic characteristic when printing color images of the securities.

The technical result, which is opravleno the invention, is to improve the identification ability of securities, in particular banknotes, shares, excise stamps, letterhead, bond books, packaging products and other not only due to the magnetic properties, but also due to the expansion of the optical characteristics, namely color in the range of 380-750 nm and IR transparency in the range of 0.74-3.0 mm.

This is achieved by the fact that according to the formula of the invention inks to protect products against counterfeiting, including pigment with protective properties, binder and diluent, as a pigment contains ultra-fine powder of rare-earth iron garnet, selected from the group comprising Y3Fe5About12, Ln3Fe5O12, YxLn3-xFe5O12where Ln is a rare earth element and 0≤x≤3, Y3-xBixFe5O12where 0≤x≤2 with a crystallite size of not more than 100 nm and not less than 85% by weight of the paint in the following ratio, wt.%:

Ultrafine powder
rare earth ferrite-garnet
with a crystallite size of 100 nm5-85
binder10-90
thinnerrest

tipografskoi paint to protect products from counterfeiting is obtained by dispersing ultra-fine powder of rare-earth iron garnet in the binder and mixing with the diluent. Studies of the claimed ink using as a pigment ultrafine powder of rare-earth iron garnet with a crystallite size of not more than 100 nm showed the ability to apply paint with a thin layer of 0.7 to 3.0 μm. The greatest value of the coercive force Hccorresponds to the size of the particles (crystallites) of about 30 nm, which is close to the size of single-domain particles (figure 1). Optimal optical characteristics obtained for a crystallite size of about 40÷80 nm (figure 2 and 3). The possibility of the introduction of the printing ink to 85% of ultra-fine powder of rare-earth ferrite-garnet because of its low oil absorption in ultra-fine condition. This can significantly improve the magnetic characteristic of the claimed ink, while maintaining its required optical characteristics, namely color in the range of 380-750 nm and IR transparency in the range of 0.74 to 3.0 μm. The high degree of dispersion of ultra-fine powder of rare-earth ferrite-garnet (small particle size) ensures the stability of dispersed systems paint due to uniform distribution in the binder improves the printing properties of the ink affects its intensity increases the smoothness and luster of the paint film. Further increase in the concentration of the claimed pigment in t is Pokrovskoe paint violates its balance sheet and, naturally, printing and technological properties, namely viscosity, viscosity, drying, etc. as a binder used in the formulations based on alkyd resins, which are typically used in offset printing, letterpress, metallographic printing, screen printing, flexographic printing and the like, the composition of the diluent is also determined by the printing method.

Thus, the use of paint as a pigment powder of rare-earth iron garnet in ultra-fine condition should produce a paint with a range of security features, namely, magnetic properties, color, infrared transparency, and according to the definition of "ultra-fine powder" [1, 2], numerous literature data [3, 4], and our studies [5], these powders have significantly different properties from conventional coarse-grained powders of the same name. It should also be noted that increased because of the small particle size of plasticity (superplasticity) nanocrystalline powder makes it more adaptable in comparison with the large powder (micron particle size) in a printing process of applying a protective drawings, and the smaller the particle size of the pigment allows us to produce more complex (with more subtle elements) the igure, which further complicates the fake.

The substrate material, which is applied printing ink, is practically unlimited. The substrate may be made of paper, film (polyethylene, Mylar and other), plastic, metal, etc. Sealing surface of a substrate can be carried out with the help of offset printing, letterpress, metallographic printing, screen printing, flexographic printing, etc. Preferred ink film thickness in finished form is 0.7 to 3.0 μm, generally 0.7 to 100 μm. Practically colorful film is fixed at room temperature, but can be fixed with the help of heat depending on the type of solvent and the used printing method.

Based on the pigment of ultrafine powders of rare earth iron garnet films with crystallite size of not more than 100 nm were fabricated samples of printing inks using laboratory test devices. Examples of specific implementations of the claimed ink and methods of its manufacture are described below.

Example 1. The paint composition for screen printing, %:

pigment Y3Fe5About1285
binder for paints TPF
based pentaftalevoj resin 10
thinner white spirit5

The pigment for the implementation of this paint composition - ultra-fine powder of yttrium-iron-garnet Y3Fe5O12with crystallite size of 76 nm. Because the color properties of the pigments is determined by the finished paint with this purpose in laboratory conditions using a handheld device to roll the paint (I used color-tester made in Holland) have been made test prints with different thickness of the paint layer (from 0.7 to 5 μm) and with spectrodensitometer "Spectrocam 75 RE measured their color and densitometric characteristics. The color characteristics of the above pigment Y3Fe5About12presented in table 1 (sample No. 1) and figure 4. According to the obtained results the color of this pigment can be described as dark green, medium intensity.

TNPF four - letter designation corresponds to the assignment of paint. The first letter is a way to print: T - screen; second, the material for which it is intended paint: N - non-absorbent surface, namely, paper, cardboard, polystyrene, General purpose, irradiated polyethylene film, aluminum foil, metal covered with enamel; the third and fourth letters - type film-forming, on which the manufactured paint: PF - pen is Attaleia resin.

The ink of the above composition were prepared immediately prior to use it on a printing press: in a binder with constant stirring was injected with diluent, the composition was thoroughly mixed, and then further stirring was added a pigment of ultrafine powder of the ferrite-garnet.

Example 2. The paint composition for offset and letterpress, %:

pigment Y3Fe5About1230
high viscosity Alcide from pentaerythritol and
phthalic anhydride-modified
linseed oil64
the diluent Flaxseed oil6

Spectral analysis proofing sheets (obtained similarly as in example 1), based on the pigment Y3Fe5About12(crystallite size 36 nm)used in example 2, showed that the color of this pigment is the most pure and bright dark green color (table 1, sample No. 2, figure 5).

Example 3. The paint composition for offset and letterpress, %:

pigment Bi2Y3Fe5About1255
high viscosity Alcide from pentaerythritol and#x0200A;
phthalic anhydride-modified
linseed oil39
the diluent Flaxseed oil6

Spectral analysis proofing sheets (obtained similarly as in example 1), based on the pigment Bi2Y3Fe5About12(crystallite size 29 nm)used in example 3, showed that his colour is dark brown with low brightness and low saturation (table 1, Fig.6).

Manufacturing process of paints for high and offset printing (examples 2 and 3) consisted of the following: composite binder was mixed with the diluent, and then to this mixture was added a pigment of ultrafine powder of the ferrite-garnet; all were thoroughly mixed using a mixer pasta-batch 30÷40 min were subjected to milling for three kratkotrajni car up to 4 times in order to obtain the desired degree of milling (<5 μm - rapid assessment on the device "the Wedge", adopted in printing).

Examples of the composition of the inventive inks show us that its color characteristics depend on the elemental composition, its pigment, and from the original particle size (crystallite size) of the pigment.

The results of production testing Savino the ink for screen printing and letterpress printing (printing numbering) is shown in Fig.7. - samples of prints printed by the screen printing method with the use of paints, developed in the Institute on the basis of the ultra-rare earth yttrium iron garnet (Y3Fe5About12with crystallite size of 76 nm No. 1; b - Y3Fe5About12with crystallite size 36 nm) and Fig - color characteristics of impressions (transonline spectral characteristics), printed by way of letterpress printing in the production environment based paint ultrafine yttrium-iron garnet with a crystallite size of 36 nm. These examples show that the color characteristics of the finished prints depend from the dispersion of the pigment used (in our case the size of the crystallites), its elemental composition, the thickness of the ink film on the lamination and graded characteristics of the raster.

Magnetic properties of the resulting prints were evaluated using a portable device Ultramag-127". The results of the measurements (table 1) showed that the device detects the magnetic response at such small thicknesses declared us paint on the stamp. The spectral characteristics of the prints was evaluated by measurements using spectrodensitometer "Spectrocam 75 RE". The reflection coefficient of the prints produced using the claimed colors in the visible part of the spectrum is a (380-750 nm) ranged from 59% to 86% depending on the pigment, its dispersion and the thickness of the layer of paint on the stamp (table 1 and 2). Measurement of prints in the infrared spectrum was carried out on a UR-20 instrument company Carl Zeiss. The claimed ink IR-transparent in the near IR spectral range from 0.74 to 3 μm (table 2) Comparative results of physico-chemical properties of the three types of pigments on the basis of ultrafine powders of rare earth iron garnet films are presented in table 2.

Thus, the claimed ink-based ultra-fine powders of rare earth iron garnet films allows a thin layer of 0.7 to 3.0 μm quickly identify securities, in particular banknotes, stock, tax stamps, forms bond books, packaging of commercial products, etc. to determine their authenticity.

Using the claimed ink to protect products from counterfeiting securities, in particular banknote, action, stamps, letterhead bond books, packaging of commercial products and find other security features, including a combination of the following characteristics, namely, magnetic properties, color in the range of 380-750 nm, IR transparency in the range of 3.0-0,74 ám.

In addition, the type of protective element sealed the inventive ink is usually not limited, and includes, for example, sockets, background grid, elements, engravings, numbers, symbols the crystals, barcode etc. the Area of the sign of protection is not limited. To enhance the effect of electromagnetic absorption preferably, the protective element was constructed by a modular principle with linear raster (regular and irregular), i.e. represented the resonator certain structure.

Sources of information

1. The dictionary of new ceramics / Shvedkov EL and others; Ed. in chief V.I. Trefilov, Kiev: Nauk. Dumka, 1991, s.

2. ) I.D., Petinov VI, Petrunin, V.F., L.I. Trusov Phys. 1981, C. B.4. With 653-692.

3. Physical chemistry of ultra-fine (nano-) systems. Proceedings of the VI all-Russian (international) conference. M: MEPhI, 2003, 584 S.

4. ..Roco, W.S. Bainbridge. Societal Implications of Nanoscience and Nanotecnology, Kluwer Academic Publishers, Doredrecht (Netherlands), 2001.

5. Physical chemistry of ultra-fine (nano-) systems. Abstracts of the VII all-Russian conference. M: MEPhI, 2005, s

Table 1
Name sample№№ p/pThe thickness of the layer of paint on the stamp, mcmMagnetic senses., (UNED)Color characteristics
XYZL
1234 6711
Y3Fe5About12(samples No. 1)14,015,533,331,57,463,0
23,613,636,635,19,365,8
33,112,2of 37.836,4the 9.766,8
42,69,342,641,712,970,7
52,28,446,045,5the 15.673,2
Y3Fe5About12(arr. No. 2)16,415,330,230,1the 11.661,7
25,112,241,742,019,670,8
34,19,245,946,626,073,9
43,06,5 58,2to 59.639,081,6
52,8a 4.966,868,649,586,3
Bi2Y3Fe5About12(arr. No. 3)12,36,928,127,010,959,0
21,96,733,232,213,863,5
31,76,139,238,619,868,4
41,24,350,750,627,576,4
50,92,458,058,435,281,0

X, Y, Z color options for international colorimetric system.

L - brightness (reflection coefficient in the range of 380-750 nm)

Table 2
Name samplePCA, OCD, nmM is gnite properties of the pigment (ultrafine powder ferrite-garnet) Magnetic sensitivity of thin films (prints)Optical propertiesThe oil absorption, cm3/100 g
HwithEσsGS·cm3/gσrGS·cm3/gTopμmaxwhen h=2,8 µm. Range(L)IR absorption cm2/gIR transmittance T%
Y3Fe5About12(samples No. 1)762433,76,20,18410,79,370,77507518,5
Y3Fe5About12(arr. No. 2)362236,62,20,0610a 4.986,3105094,320
Bi2Y3Fe5About12(arr. No. 3)294324,8the 5.70,2305,66,95971683of 17.5

X - ray x-ray analysis; ROC - coherent scattering in nm Magnetic properties of samples were investigated on the HV meter, modela, in an alternating magnetic field A

according to the following parameters:

• coercive force Hwith(E)

• the saturation magnetization - σsGS·cm3/g) (emu/g);

• remanence - σrGS·cm3/g) (emu/g);

• the Squareness ratio (Kp);

• magnetic susceptibility - μmax.

Optical harakteristiki: L - reflectance in the range of 380-750 nm

The oil absorption is a minimum amount of oil needed to transfer the pigment powder in a paste state.

Printing ink to protect products against counterfeiting, including pigment with protective properties, binder and diluent, characterized in that as a pigment it contains ultra-fine powder of rare-earth iron garnet, selected from the group comprising Y3Fe5About12, Ln3Fe5O12, YxLn3-xFe5O12where Ln is a rare earth element, 0≤x≤3, Y3-xBixFe5O12where 0≤x≤2, with a crystallite size of not more than 100 nm and not less than 85% by weight of the paint in the following ratio, wt.%:

Ultrafine powder specified
redkozemelnaja-pomegranate 5-85
Binder10-90
ThinnerRest



 

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25 cl, 84 dwg

FIELD: protective element, having a composition of optically efficient structures in layered composite.

SUBSTANCE: protective element contains a layered composite for gluing onto substrate, containing form-making layer, protective layer of plastic material and reflective layer, which is positioned between form-making layer and protective layer of layered composite, while optically efficient structures of protective sign are formed in reflective layer. Protective sign has at least one surface with optical information element, on which reflective layer is made in form of mirror macro-structure with smooth profile, which in partial areas, forming relief display of information, is made curved so, that adjacent points with extreme values relatively to height of macro-structure profile are distanced for at least 0,3 millimeters. Point of macro-structure never has angle ±γ of local inclination of tangential surface to macro-structure, which angle is measured relatively to the surface of layered composite, greater than 7°. Surface with macro-structure is adapted for deflecting light, which falls in parallel manner at angle α relatively to normal onto surface of layered composite within limits of previously given angular range ε 14° around direction of mirror reflection, which includes angle (β=α) of reflection with normal line, so that element of optical information is visually visible, but can not be photo-copied.

EFFECT: high level of protection from photo-copying.

2 cl, 7 dwg

FIELD: manufacturing multi-layered films.

SUBSTANCE: film comprises base made of bi-axially oriented polypropylene film and polyolefin film. Before laminating, the polyolefin film is colored. The multi-layered film is oriented in transverse direction or longitudinal direction and transverse direction after laminating. The thickness of the multi-layered film ranges from 8 μm to 26 μm. The method of producing the multi-layered film is also presented.

EFFECT: expanded functional capabilities.

9 cl, 3 ex

FIELD: printing industry.

SUBSTANCE: proposed storage medium with half-tone image in engraving style produced by method of intaglio printing, i.e. presented by irregular linear structures, consists of repeated printable structural elements. Fine structure present within the limits of structural elements in from of spaces are partially applied to structural elements.

EFFECT: provision of complex design, high protection from counterfeit.

36 cl, 16 dwg

FIELD: printing processes to produce particular kinds of printed work.

SUBSTANCE: different color paint is applied to printing plate rolled up with paint within limits of definite pattern of mask.

EFFECT: improved quality of printing.

6 cl, 1 dwg

FIELD: methods of producing data carriers.

SUBSTANCE: method can be used for making persona; identifications in form of cards, securities etc. Method of making info carrier (1,10) provided with protective element having optically variable properties. The element has at least one distinguish marking (5, 6, 11) and at least one light-permeable layer (4) with optically variable properties. Layer having optically variable properties is at least at several parts overlapped with marking. Light-permeable layer (4) with optically variable properties is applied onto data carrier and marking (5, 6, and 11) is made through the layer onto data carrier (7) formed by means of laser radiation. Layer (4) with optically transparent properties has material, which creates optical variable effect. Moreover, the layer stays invariable under influence of laser radiation. Method provides high protection against imitation.

EFFECT: simplification; reduced cost of production.

30 cl, 4 dwg

FIELD: data carriers.

SUBSTANCE: data carrier is provided with protective element, which allows at least visual control and has at least on a portion an engraving, which is a semi-tone blind engraving, produced by metallographic printing without ink feed, and also disclosed are method for making a data carrier and printing form for making protective element by means of blind engraving.

EFFECT: higher level of protection from forgery.

3 cl, 13 dwg

FIELD: information medium sealed up by the method of metallographic printing, method for its manufacture, as well as a printing plate suitable for the purpose and the method for its manufacture.

SUBSTANCE: the information medium, first of all a bank note, securities or a similar document, which has at least one sealed up section (13) and at least one separate section (14) practically completely encircled by this section. The mentioned section (13) and the separate section (14) are sealed up by the metallographic method, and both sections are sealed up by paint coats of a different thickness and differ from one another.

EFFECT: provided a high degree of protection against forgery of the information medium.

21 cl, 11 dwg

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