Inorganic sheet, bearing the symbols intended for the manufacture of elements pigment

 

The invention relates to inorganic sheet bearing at least one character, intended for the manufacture of elements of the pigment of a predetermined size, which are used for labeling products, to a method of forming such inorganic elements of pigments and pigment to the coating composition containing pigment particles, intended for printing or ink, as well as to the substrate, which is applied compositions. Inorganic sheets, comprising at least two stacked on top of each layer, is applied to one or more characters in size from 1 to 10 microns with at least partial removal of the layer with a laser with a short wavelength in the wavelength range of not more than 1.5 μm. Inorganic sheet is formed so that it formed flakes of pigment. 7 C. and 10 C.p. f-crystals, 10 ill.

The invention relates to inorganic sheet bearing at least one character, intended for the manufacture of elements of the pigment of a predetermined size, which are used for labeling products, and to a method of forming such inorganic elements pigment and pigment in accordance with the preamble Nezavisimaya information in the form of symbols, in the coating composition described in U.S. patent 5744223. These aluminum plates are formed as sections with embossing of thin aluminum foil, which is then cut in the shape of a plate. Plate with embossed serve as storage media to prevent unauthorized sale or stealing cars.

Because of the aluminium plate are silvery and opaque, their disadvantage is conspicuous, the appearance, when they are in the coating composition, in particular, in the composition of the ink used for printing, which either do not have color or have a color different from the color of the plate. This immediately makes it obvious for any fraudster fact that this product was tagged. On the other hand, in the composition of the coatings, which have the same color as the aluminum plate, the detection of aluminum plates with embossed is extremely difficult.

Symbols coating on the foil by embossing limited to materials that can be processed (aluminum, plastic and so on). Therefore, by direct stamping impossible to put symbols on fragile and not machinable materials.

Another disadvantage of the procedure tis the x impacts, such as exposure to water.

The aim of the present invention is to eliminate the disadvantages of the prior art, in particular, the invention is directed to the development of pigment particles and improved methods, and ways of manufacturing of pigment particles, improved bearing properties, providing security in a variety of applications.

In particular, the present invention is directed to the creation of the pigment particles bearing the symbols with color coordinated with the color coating composition or ink used for printing.

Another objective of the present invention is the creation of pigment particles bearing the symbol, which can be easily detected within the coating composition, which have a dark or saturated colors.

Another objective of the present invention is the creation of pigment particles having both open and hidden properties that prevent against counterfeit.

Another objective of the present invention is a method intended for drawing characters on materials that are not amenable to treatment in the same manner as aluminum or plastic.

Another objective of the present invention is to protect against corrosion of any metallicheskaya using properties of the independent claims.

In particular, they are achieved by forming the inorganic sheet, intended for the manufacture of elements of the pigment of a predetermined size, which caused at least one character, in which the sheet contains at least two stacked on top of each layer, which have different physical and/or chemical composition.

Pigments made from inorganic sheets, usually in the form of flakes. In the context of the present invention covers all types of shiny or have another property impacts pigment flakes, which consist of at least two superimposed on each layer, and which are made of inorganic sheets. In particular, good results are achieved with pigments having a pearly luster, in accordance with the definition of DIN 55943: 1993 and pigments, to cause interference, in accordance with the definition of DIN 55944: 1990-04. Pigments having at least two layers of different colors, also well suited for the purposes of the present invention.

Such inorganic sheets, comprising at least two superimposed on each of the layers can be produced, for example, using any known tearo, chemical vapour deposition, sputtering or wet processes, as described, for example, in Encyclopedia of industrial chemistry Ullmann, fifth edition, volume A6, page 67, Verlag Chemie, Weinheim, Germany (Ullmann''s Encyclopedia of Industrial Chemistry, fifth edition, volume A6, page 67, Verlag Chemie, Weinheim, Germany).

In a preferred embodiment, the present invention is directed to the creation of the inorganic sheet having variations in color depending on the angle at which the plotted symbols, intended for the manufacture of elements of the pigment.

The pigment flakes having variations in color depending on the angle of view, are well known. They are of particular interest for their introduction into the ink intended for printing, to protect documents. Since color variation depending on the angle does not play photocopy machines, such pigment flakes give the document a good security properties. Pigment flakes, their production and various applications have already been described in various patents, for example, in the American patent US 4434010, in the American patent US 5059245, in the American patent US 5084351, in the American patent US 5135812, in the American patent US 5171363, in the American patent US 5279657.

the AI sequence of thin layers, installed parallel to each other, with different optical characteristics. Shade, the changing colors and color saturation of pigment flakes depend on the materials constituting the layers, the sequence of layers, number of layers and their thickness.

Simple inorganic sheet having a color change depending on the angle of view, on which were drawn characters and which can be crushed for the formation of pigment flakes of a predetermined size, consists of two flat, partially reflective, i.e. semi-transparent metal layers, which are mounted essentially parallel to each other and are separated by a layer of material with a low refractive index, for example, SiO2or MgF2. Material with a low refractive index is often described as the dielectric material. This type of pigment flakes, which is based on the principle of Fabry-Perot (Fabry-Prot), was first patented by DuPont (Du Font) in the American patent US 3438796.

Terms - translucent, transparent, opaque, fully or partially reflective, refer to the light in the visible range of the electromagnetic spectrum, i.e. with a wavelength of approx the ETA depending on the angle of view was achieved with the introduction of the opaque totally reflecting thin layer in a layered structure of dielectric and partially reflective layers. Due to its availability can be obtained symmetric structure with an opaque totally reflecting layer containing the first and second surfaces and a Central layer. To obtain a symmetric multilayer structure on the first and second surfaces of the opaque totally reflecting layer, a thin layer of dielectric material; then semi-transparent partially reflecting thin layers are applied on top of both layers of dielectric. The minimum number of layers in such a symmetric structure, therefore, is five layers. However, also can be made asymmetrical layered structure, in which the minimum number of layers is three layers that consist of a single opaque totally reflecting layer, a single dielectric layer and one partially reflective and partially transmissive layer.

The opaque totally reflecting layer is usually made of metal and preferably consists of aluminum with a thickness of 300 nm is preferably in the range of 50-150 nm. Gold, copper and silver can be used as alternative metals.

The dielectric material should be transparent with a refractive index not more than 1,65. Usually SiO2or Mccny layer or layers can be composed of metal, oxide of the metal or metal sulfide. They can be made of aluminum, Nickel, material Inecel (Inocel), chromium, S2, Fe2About3and so on, the Degree of transparency of a layer of a metal is a function of the layer thickness. Usually the thickness of the translucent layer is selected from 5 to 20 nm.

Inorganic sheet having a color change depending on the angle, preferably produced on the base material, such as a flexible thin sheet, such as polyethylene terephthalate. In most cases, the first translucent layer is applied to the flexible sheet material. After applying all subsequent layers of the multilayer coating is separated from the flexible thin sheet, it usually is broken into small pieces of irregular shape and size. These pieces require additional grinding to obtain the desired size of the pigment flakes that are suitable for a coating composition and, in particular, to ink used for printing, or for introduction into the mass of material.

As described above, pigments which have a color shift depending on angle of view, give the document a high degree of protection. This property directed against fakes, additionally improved at drawing characters, the information.

The characters are formed, at least one of the inorganic layers of the sheet by means of local changes in the optical properties, preferably reflectivity. This is achieved by at least partial destruction of at least one of the layers.

The size and number of characters must be such, in order to produce proper identification labels after breaking and grinding to the desired size of the pigment flakes. In regard to the first requirement, the characters should not cover too many flakes of pigment. The symbols preferably are chosen with a size of 0.5 to 20 μm and even more preferably with a size of 1-10 μm. In the context of the present description size indicates the approximate character width. This size range corresponds to the size of the flakes of pigment, which on average is in the range from 5 to 40 μm, but not more than 100 μm. However, the flakes can be milled to a size of 2 to 5 microns without destroying their color characteristics.

Regarding the second requirement, the symbol should be applied on a sufficient number of the total pigment flakes. In General, not less than 1 wt.% the total mass of flakes of pigment present in the composition is Moly, applied, at least one of the layers of pigment flakes can be read using light or electron microscopy.

The optical properties, in particular, the pigment flakes having a color change depending on the angle of view, but also other shiny or cause certain effects, pigments, allow you to easily and quickly localize the location in the mass of material, coating or ink composition, in which you should obtain and read the recorded information. Detection in particular is simply carried out using a conventional light microscope of any type, if the local change in optical properties is a local decrease in reflectivity or color change layer. The pigment flakes can be manufactured in any color so that they will match the color of the coating composition of the ink used for printing, or so that they will be contrasted with them.

The pigment particles with a pearly lustre, for example, can be embedded in a transparent ink, without affecting their transparency. This is possible due to the small number of pigment flakes which is necessary for labeling, detecting and reading information. Lowest reminaing for printing.

On the pigment flakes can be applied to more than one symbol. In preferred embodiments, embodiments of the present invention, the symbol consists of a sequence of alphanumeric characters and/or company logos, and/or digital information. This sequence can be used to transmit information, for example, about the last user, the place of production, the number of production and so on

Characters can be particularly easily applied using at least partial removal of the layer by using short-wavelength high-power laser that has a wavelength of not more than 12 μm, and preferably not more than 1.5 μm. In particular, a UV excimer laser or laser yttrium aluminum garnet with nitima with high power in a pulse mode, and the characters of "breaking" one after another on the surface layer by means of projecting the mask and the corresponding optical device. The marking may be affixed to a surface area of up to 3 cm2for one pulse, and with the help of modern models of such excimer lasers can be made up to 400 pulses per second.

As an alternative for applying symbol the beginning, managed processor by known techniques. The process of drawing characters in this case, however, takes more time than the operation "penetration", and with its help it is difficult to achieve the velocity required for industrial production.

At short wavelengths, especially in the ultraviolet range, laser removal affects directly break chemical bonds. In most cases this process, rather, leads to the atomization of the deleted matter than to heat the substrate up to the temperature of evaporation. It is preferred for the method in accordance with the present invention: the substrate is not exposed to excessive heat.

In accordance with the present invention, the symbols are applied, at least one of the inorganic layers of the sheet. It can be one of the external surfaces of the outer layer sheet or even one of the inner surfaces. At least one character can be applied in the manufacture of the sheet.

In the context of the present description inner surface formed inside the layered structure at the interface between the two adjacent to each other layers, which differ in their physical or chemical feature is the structure and the environment or the interface between the last layer, which operates in accordance with a special optical characteristics of the flake pigment, for example, in terms of color or color saturation, and a layer having a simple protective function.

The depth of characters can be specified, for example, such that it will be limited by the thickness of one layer. However, extending it to the layer below is also possible. The symbol can be applied directly on the material before applying the next layer or layers. In addition, the symbol can be applied to several layers.

Instead of forming characters by using the laser irradiation characters may be applied by other means such as embossing or printing. In a preferred variant embodiment, this is achieved by embossing a flexible thin sheet. When the material is applied in such a thin sheet, the characters made by stamping, are transferred to the first and subsequent layers. However, actually, the surface layers will be raised is greater, the greater the number of layers is imposed on each other.

The symbol can also be created on the flexible thin sheet using any application of technology, including microprinting.

Regardless of the method used for drawing characters on gilkinson on a thin sheet.

In another alternative method provides for the possibility of the formation of invisible symbols, i.e. symbols that can be visualized using a special detection devices. Symbols can also be created by means of local changes in electric, magnetic or electromagnetic properties. It is possible to apply additional layers (for protection) on the sheet after forming characters or particles after grinding. This should satisfy the condition that the additional layers will not impede the reading of the information.

Flakes of pigment bearing the symbol, in accordance with the present invention can be implemented in any type of coverage, bulk material, and preferably in ink, designed for printing. If products, which have been coated with such a coating or who was drawing with ink with such a composition will be analysed using the appropriate analysis device, it will be possible to read the symbols and information. This is especially useful for marking and authentication of banknotes, checks and so on, or goods that have factory markings.

The information presented simwinga read protected documents. A product bearing such coating or covering, as such, can be analyzed using the analysis device, such as a microscope, in the case of applying localized visible marking.

Any of the known printing technologies such as gravure, flexography, offset printing, letterpress or screen printing can be used together with the ink containing the pigment particles, in accordance with the present invention, which will be described in detail in the following variants of the embodiment with reference to the accompanying drawings, in which: Fig. 1 depicts in cross section with increasing inorganic sheet bearing the symbol, in accordance with the present invention, is shown in Fig. 8b; Fig. 2 is a cross-sectional inorganic sheet having the property of changing color depending on the angle at which the plotted symbols; Fig. 3 is another alternative example of the inorganic sheet according to Fig. 2; Fig. 4A and Fig. 4b is a view with a magnification of one of the surfaces of the layers, the carrier set of symbols; Fig. 5 is a schematic depiction of a substrate on which a coating in accordance with the present invention; Fig. 6 is a view with the increase of the substrate in Fig. 4; Fig. 7 is a cross-sectional HC. 8A is a schematic depiction of a set of pigment flakes made from sheet shown in Fig.8b in accordance with the present invention; Fig. 8b - inorganic sheet, on which printed characters.

In Fig. 1 depicts an inorganic sheet 10 before grinding it for education pigment flakes 15 (Fig.6 and 8). This worksheet consists of the first layer 11, on the outer surface 13 which is coated with the symbol 20 and the layer 12, which has an outer surface 13 and the inner surface 14.

In Fig. 2 shows a cross section of the inorganic sheet containing layer 23 of the dielectric with the first surface 29 and the second surface 28. In the first and second surfaces 28, 29 of the dielectric layer deposited layers of semi-transparent partially reflecting layer 21. The first and second surfaces 28, 29 are at the same time the inner surfaces 14 of the multilayer structure 18. Many characters 20 deposited on the outer surface 13 of the outer layer 21 and inner surface 14 of the outer layer 21.

Figure 3 schematically depicts a method of creating characters on the sheet 10 in accordance with the present invention. Inorganic sheet 10 formed on the flexible thin sheet 19, containing the first partially reflective layer 21, to the surrounding layer 22 with the first and second surfaces 26, 28, an extra layer 23 of the dielectric and the second partially reflective layer 21.

In particular inorganic layer was formed on a symmetric thin flexible sheet 19 made of polyethylene terephthalate with layers of CR (20 nm) 21, MgF2(400 nm) 23, Al (60 nm) 22, MgF2(400 nm) 23, Cr (20 nm) 21.

Characters 20 were formed on the inorganic sheet 10 using a KrF excimer laser 30 type Lambda Piix" ("Lambda Phsyics") with a wavelength of 248 nm. This laser makes it possible to generate pulses of energy up to 550 MJ/cm2with a pulse frequency up to 400 Hz. Characters 20 were "punched" into the outer surface 13 of the partially reflecting layer 21 inorganic sheet 10 using a single pulse laser with a power of 200 MJ/cm2. This energy is sufficient to remove the surface layer 21 of chromium. Characters 20 height of 5.4 μm perfectly readable with the help of the microscope.

In Fig. 4A and 4b shows a view in cross-section increasing from the surfaces 13, 14, bearing the symbols of inorganic sheet 10.

The height of the characters 20 in Fig. 4A is 11.4 μm; and Fig. 4b their height is 5.4 μm.

In Fig. 5 depicts a substrate 25, which is covered by applying ink 16, designed to be printed, containing flakes 15 pigment. Section a of the substrate 25, itimeout optically variable properties. The substrate 25 on which is deposited a coating or printed image containing the pigment flakes 15, can be seen under the microscope, and 20 characters can be read. The concentration of the pigment flakes 15 will determine the degree of coverage of the substrate. Pigment flakes 15 were made of sheet 10 (Fig.3), which was applied as 20 characters the inscription "SICPA" representing the identification of the manufacturer, the number "1997" to identify the year of manufacture and the number of "1201" to identify the batch number. Statistically all information will be kept in a certain amount of pigment flakes, even if some of the flakes will contain only the part of the individual characters 20.

In Fig. 7 shows the view from the increase in flexible thin sheet 19, which carries the symbol 20, which was obtained using mikrotisneniya or microprinting. It is applied the first layer 11 which is formed character 20, which represents a reverse its display.

In Fig. 8A shows a lot of pigment flakes 15 obtained by separating and grinding of inorganic sheet 10 in Fig. 8b to the desired particle size. Pigment flakes 15 are of such size that they may contain krichefski sheet (10), having the property of changing color, which depends on the angle of view, with the specified worksheet contains a layered structure consisting of at least one layer of material (23) with a low refractive index and the layer has a first surface (28) and second surface (29) of at least one semi-transparent partially reflecting layer (21) on one of the surfaces (28, 29) of the layer (23) with a low refractive index and at least one layer (21, 22), selected from the group consisting of semi-transparent partially reflecting layer and the opaque totally reflecting layer on the other surface (28, 29) of the material (23) with a low refractive index inorganic sheet carries one or more characters (20) formed with at least partial removal of the layer with a laser with a short wavelength in the wavelength range of not more than 1.5 μm.

2. Inorganic sheet (10) under item 1, characterized in that at least one character (20) deposited on the outer surface (13) of the outer layer (21).

3. Inorganic sheet (10) according to any one of paragraphs.1 and 2, characterized in that at least one character (20) applied to at least one of the inner surfaces (1l (20) applied to at least one of the inner surfaces (14) of the multilayer structure and on the outer surface (13) of the sheet (10).

5. Inorganic sheet (10) according to any one of paragraphs.1-4, characterized in that the size of the symbol (20) is from 0.5 to 20 μm.

6. Inorganic sheet (10) according to any one of paragraphs.1-5, characterized in that the size of the symbol (20) is from 1 to 10 microns.

7. A method of manufacturing inorganic pigment particles (15), which is applied at least one character (20), containing the steps of manufacturing a multilayer sheet (10) of at least two superimposed on each of the layers (11, 12); applying at least one character (20) on at least one of the surfaces (13, 14) of the layers (11, 12); grinding the specified multi-layered sheet (10) prior to the formation of flakes (15) of the pigment of the desired size so that the size of these flakes is in the range of 0.5 - 100 μm.

8. The method according to p. 7, characterized in that the size of the flake pigment is in the range of 5 to 40 μm.

9. A method of manufacturing inorganic pigment particles (15), bearing at least one character (20), which exhibit properties changes color depending on the angle of view, containing the steps of (a) the manufacture of flexible thin sheet (19); (b) create the layered inorganic sheet (10) on the specified flexible thin sheet (19) by deposition on him semi-transparent partially reflecting slew reflecting layer (22); (c) forming at least one character (20) on at least one of these layers (21, 22, 23); (d) detaching the specified multi-layered sheet (10) of a flexible thin sheet (19); (e) grinding the specified layered inorganic sheet (10) formation of pigment flakes (15) of the desired size in the range of 0.5 - 100 μm.

10. The method according to one of paragraphs.7-9, characterized in that one or more characters (20) are formed by at least partial removal of the layer, which is created by using a laser with a short wavelength of not more 1.5 μm.

11. The method according to one of paragraphs.7-10, characterized in that one or more characters (20) are formed using mikrotisneniya and/or the microprinting.

12. The method according to p. 11, characterized in that one or more characters (20) are formed on the flexible thin sheet (19) before settling on him the first layer (21).

13. The pigment particles produced by crushing an inorganic sheet (10) according to one of paragraphs.1-6.

14. The coating composition containing pigment particles (15) in accordance with p. 13 in the amount of at least 1% of the total weight of the pigment particles and the binder.

15. The coating composition according to p. 14, characterized t in accordance with any of paragraphs.14 and 15.

17. Secure document printing is performed with the use of ink in accordance with p. 15.

 

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FIELD: protective marks.

SUBSTANCE: method for making protective marks on carrier having first surface and second surface opposite to first surface, includes sealing of first surface with high-resolution varnish, carrier is then electrolyzed and then washed and dried.

EFFECT: higher level of protection of forgery.

3 cl, 25 dwg

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