RU2648438C1 - Magnetic pigment - Google Patents

Magnetic pigment Download PDF

Info

Publication number
RU2648438C1
RU2648438C1 RU2017113710A RU2017113710A RU2648438C1 RU 2648438 C1 RU2648438 C1 RU 2648438C1 RU 2017113710 A RU2017113710 A RU 2017113710A RU 2017113710 A RU2017113710 A RU 2017113710A RU 2648438 C1 RU2648438 C1 RU 2648438C1
Authority
RU
Russia
Prior art keywords
particles
pigment
protective
layers
protective element
Prior art date
Application number
RU2017113710A
Other languages
Russian (ru)
Inventor
Игорь Васильевич Павлов
Георгий Валентинович Корнилов
Елена Михайловна Федорова
Александр Георгиевич Писарев
Елена Самуиловна Туркина
Анатолий Павлович Губарев
Original Assignee
Акционерное общество "ГОЗНАК"
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Акционерное общество "ГОЗНАК" filed Critical Акционерное общество "ГОЗНАК"
Priority to RU2017113710A priority Critical patent/RU2648438C1/en
Application granted granted Critical
Publication of RU2648438C1 publication Critical patent/RU2648438C1/en

Links

Images

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B42BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42DBOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D15/00Printed matter of special format or style not otherwise provided for
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B42BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42DBOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30Identification or security features, e.g. for preventing forgery
    • B42D25/36Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/378Special inks
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09CTREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES; PREPARATION OF CARBON BLACK; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C1/00Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/0081Composite particulate pigments or fillers, i.e. containing at least two solid phases, except those consisting of coated particles of one compound
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00Layered products comprising a layer of metal
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41MPRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M3/00Printing processes to produce particular kinds of printed work, e.g. patterns
    • B41M3/14Security printing
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes

Abstract

FIELD: chemistry.
SUBSTANCE: pigment for the protective element contains a powder of flat particles with a thickness of 10-20 mcm and plane dimensions of 20-40 mcm. These particles comprise a core layer of magnetic material and external ink and/or interference layers that provide colour alternation when viewed from different angles. At least some of the pigment particles have the same dimensions and identifiable boundaries form specified in their manufacture and different by less than 3% for each of the particles. The outer layers are made of photosensitive transparent materials in which three-dimensional phase-contrast Bragg diffraction gratings are formed.
EFFECT: invention allows to obtain a pigment, the authenticity of which is reliably and simply controlled visually or by simple optical means.
3 cl, 2 dwg, 2 ex

Description

The invention relates to the field of manufacture of pigments used in printing inks and inks for printing anti-counterfeiting printing products.

Known pigments used in printing inks with color-changing effects that change the color of images when changing the direction of their lighting or observation. In a number of technical solutions described, for example, in US 6236510, 05.22.2001; RU 2146687, 03.20.2000; RU 2429978, 09/27/2011, the color-changing effect in pigments is achieved by making pigment particles in the form of flat plates of a scaly appearance, made in the form of multilayer thin-film structures. Inorganic or metallic materials are usually used for particle cores. Flat transparent or reflective cores are coated by vacuum deposition or chemical deposition using transparent, translucent or reflective thin-layer metal or dielectric coatings with interference reflective properties. Particle sizes are usually in the range of 1-100 microns. When using varnishes and paints containing pigments with such particles, the original interference color-changing effects are obtained. Such inks are widely used to protect printing products. When copying printing products protected in this way, the color-contrast and color-changing effects disappear.

Known technical solutions of pigments in which the core of the particles or thin-film coatings are made of magnetic materials (US 7517578, 04/14/2009; RU 2333230, 09/10/2008; EA 005456, 02.24.2005). Such pigments allow local orientation of magnetic particles by exposure to magnetic fields. In technical solutions RU 2333105, 09/10/2008; RU 2568708, 11.20.2015; RU 2588463, 06/27/2016, pigments with magnetic particles are used in the compositions of UV curable paints. This makes it possible to form various original color-variable images in polygraphic prints using spatially inhomogeneous magnetic fields. Such images are formed by orienting the particles in uncured impressions, which are then captured during UV curing.

The closest analogue of the claimed technical solution is the pigment proposed in patent EA 005456, 02.24.2005. Optically variable magnetic pigments containing multilayer magnetic pigment plates colored with color-changing compositions are proposed. Magnetic pigment plates are coated on both sides with insulating and reflective layers, due to which, due to interference effects, the color of their surfaces changes with changing viewing angles or lighting.

A disadvantage of the known technical solution is the complexity of the visual and instrumental identification of pigments used in paints. The identification of pigments is carried out according to the sequence of color changes when changing the angles of observation and illumination of the pigment particles or their magnetic characteristics. Such procedures require special equipment, quite complex and time-consuming. This makes it difficult to verify the authenticity of pigments used in paints and thereby reduces the security of printing products.

The problem solved by the invention is the creation of a pigment, the authenticity of which is reliably and simply controlled visually or using simple optical means.

This is achieved by the fact that a magnetic pigment is proposed containing a powder of flat particles with a thickness of 10-20 μm and dimensions in the plane of 20-40 μm, including a central layer of magnetic material and external colorful and / or interference layers that provide color variation when observed under various corners, according to the invention, at least some of the pigment particles have the same size and easily identifiable shape of the boundaries specified in their manufacture and different for each of the particles by less than 3%, while the outer layers are made of the photosensitive transparent material, in which are formed three-dimensional phase contrast Bragg gratings.

The specified shape and accuracy of the formation of the configuration of the boundaries provides the ability to control the shape of pigment particles with a size of about 20-40 microns at the level of resolution of optical devices used in operational and laboratory authentication of products (magnifiers and microscopes with an increase of about 100 times). A given shape may not be all particles, but only their part, which is mixed with particles having similar optical and magnetic properties, but in which the particle shape was not specified and had the form characteristic of a random image of broken flat particles.

When pigment particles of a given shape are introduced into paints and varnishes, their breaking is possible, but the possibility of identifying the pigment by such broken particles remains, it can be carried out according to the shape of their boundaries. Broken particles with an initially given shape have sections of boundaries that were formed prior to their breaking. It is possible to identify the paints and varnishes used in the protected product in these areas.

The outer layers of pigment particles made of photosensitive transparent materials, in which bulk phase-contrast Bragg diffraction gratings are formed, allow the pigment to be identified by the characteristic color-variation effect. The nature of the reflection of light from bulk phase-contrast diffraction Bragg gratings has several easily distinguishable features. The reflected diffracted radiation from such gratings is characterized by a very high degree of spatial and spectral selectivity. Diffracted radiation is concentrated in one narrow, of the order of several degrees, spatial angle and in a very narrow spectral range, 10-30 nm wide, and the diffraction efficiency of the reflected radiation can reach 90-95%. The angle of reflection and the color (wavelength) of the reflected radiation are determined by the period and spatial orientation of the phase-contrast grating.

When examining a protective element illuminated by white light, in the paint layer of which the proposed pigment particles are contained, when changing the viewing angles, bright sparks-flashes will be observed in the places where the pigment particles are oriented accordingly. If the gratings were formed using green coherent radiation, the spark-flashes will be green, if red radiation was used to record the gratings, the color of the sparks will be red. All known color-variable pigment structures based on various optical effects (interference, polarization, liquid crystal) do not demonstrate the above-mentioned features of color variability.

Similar in appearance to the above-described effect of light reflection from paint and varnish structures with the proposed pigment particles are opalescence effects observed in semiprecious stones and colloidal liquids. The narrowly directed diffracted radiation from particles with coatings containing bulk phase-contrast Bragg gratings makes it easy to fix their location in the protective element and to control their shape. In this case, the required number of input particles having a given shape and having the color variability described above may not exceed one or two per square centimeter.

When forming color-changing structures with paints and varnishes based on the pigments described in the prototype, concentrations are usually used to close the surfaces of the products to be protected in one or two layers. Given that the size of the particles used is usually 10-50 nm, the number of such particles per square centimeter will be about 10 6 -2 × 10 4 units.

To create a protective marking on the basis of the inventive pigment particles, it is sufficient to introduce them into the composition of varnishes or paints in a minimum concentration, for example, less than one hundredth of a percent. This provides an additional positive effect, which consists in a significant reduction in costs associated with the use of expensive pigment. The use of the proposed pigment in the indicated minimum concentrations allows the production of transparent protective polymer structures, for example, in plastic cards, demonstrating the effects of opalescence, i.e. the occurrence of multi-colored narrowly directed flashes of sparks of the light reflected by them.

To clarify the invention we give examples of its implementation.

In FIG. 1 shows the structure of a pigment particle made in accordance with the invention. In FIG. 2a and 2b show the formed pigment magnetic particles of square and cross shape.

Example 1. The pigment particle (Fig. 1) consists of a multilayer magnetic structure 2 and the outer layers 1 and 3 made of photosensitive transparent materials in which bulk phase-contrast Bragg diffraction gratings are formed.

The multilayer structure 2 is made of amorphous magnetic materials with characteristic hysteresis loops formed during their manufacture by thermal annealing, providing bistable or multistable states of magnetization of particles and their uniform spasmodic magnetization reversal in external magnetic fields of a given magnitude and directions. As amorphous magnetic materials can be used alloys based on nickel, iron, cobalt and other metals, for example Fe-Co-Ni, Fe-Ni-B, Co-Mn-Si-B.

As photosensitive transparent materials can be used various transparent and translucent holographic photopolymer materials, for example, firms DuPont (US 4959284); Bayer (RU 2515991); "Xetos" (US 8603730) or a holographic nanocomposite of Russian manufacture (RU 2574723). The thickness of the amorphous magnetic layers in the magnetic structure 2 may have a value from 0.01 μm to units of microns. The total thickness of the pigment particles may be 10-20 microns.

The manufacture of pigment particles is as follows. A photopolymer material is applied to the polymer substrate by extrusion or irrigation methods. Then, volume Bragg diffraction gratings are recorded in it. Next, thin-film layers of magnetic materials with the necessary physical, optical and strength properties are deposited on the polymerized photopolymer layer by vacuum or chemical deposition from the vapor phase or solution. Next, the upper photopolymer layer is applied to the obtained two-layer structure, its polymerization is carried out, and bulk Bragg gratings are recorded in it. Moreover, the first layer deposited on the polymer substrate must have low adhesion to the surface of the substrate, and the materials of subsequent layers to be applied, on the contrary, must have good adhesion to the surfaces on which they are applied. After the manufacture of the described three-layer structure, it is fractured into particles of a given shape and size and their separation from the polymer substrate.

Example 2. In FIG. 2a and 2b show pigment particles of a square and cross shape. Obviously, for the purpose of identifying pigment particles, the cross shape of the particles is more convenient. It allows identification even when the particles are broken. The manufacture of a three-layer photopolymer structure is carried out analogously to example 1. Then, the obtained thin-film structure is subjected to cutting into particles of a given configuration and size, while cutting is carried out to the depth of the formed multilayer structure. Cutting is carried out by electroerosive or laser methods with a cut thickness of less than 0.1 microns and a depth of about 1-5 microns, with simultaneous separation of the cut flat scaly particles from the polymer substrate.

As mentioned above, the proportion of pigment particles in the composition of the paint composition can be hundredths of a percent. In fact, for each specific case, the necessary proportion of pigment particles is calculated individually, taking into account the material of the product, its size, configuration of the protective element and the requirements for its identification. Similarly, the proportion of particles of a given shape is determined with respect to the total number of pigment particles. To identify particles of a certain shape, it is enough that 1 or 2 of such particles fall per 1 square centimeter of the finished product (protective element). Thus, the proportion of particles of a given shape can be from tenths of a percent to several units of percent to the total volume of pigment powder.

Claims (3)

1. The pigment for the protective element containing a powder of flat particles with a thickness of 10-20 microns and dimensions in the plane of 20-40 microns, including a Central layer of magnetic material and external colorful and / or interference layers, providing color change when observing them at different angles, characterized in that at least some of the pigment particles have the same size and easily identifiable shape of the boundaries set during their manufacture and differ for each of the particles by less than 3%, while the outer layers are made enes of the photosensitive transparent material, in which are formed three-dimensional phase contrast Bragg gratings.
2. A protective element for printing products containing a protective pigment according to claim 1.
3. A printing product containing a protective pigment according to claim 1.
RU2017113710A 2017-04-20 2017-04-20 Magnetic pigment RU2648438C1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
RU2017113710A RU2648438C1 (en) 2017-04-20 2017-04-20 Magnetic pigment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
RU2017113710A RU2648438C1 (en) 2017-04-20 2017-04-20 Magnetic pigment

Publications (1)

Publication Number Publication Date
RU2648438C1 true RU2648438C1 (en) 2018-03-26

Family

ID=61708137

Family Applications (1)

Application Number Title Priority Date Filing Date
RU2017113710A RU2648438C1 (en) 2017-04-20 2017-04-20 Magnetic pigment

Country Status (1)

Country Link
RU (1) RU2648438C1 (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EA005456B1 (en) * 2001-03-09 2005-02-24 Сикпа Холдинг С.А. The magnetic thin film interference pigment or agent, and a method for their manufacture, printing ink or coating composition material, security and application of such a magnetic thin film interference means
RU2326006C1 (en) * 2006-12-21 2008-06-10 Федеральное Государственное Унитарное Предприятие "Гознак" (Фгуп "Гознак") Protective element (alternatives), method of making it, counterfeit protected material and valuable document
EP1950256A1 (en) * 2003-08-14 2008-07-30 JDS Uniphase Corporation Flake for covert security applications
WO2008141973A1 (en) * 2007-05-18 2008-11-27 Unilever Plc Monodisperse particles
RU2456164C2 (en) * 2003-11-14 2012-07-20 Принтетч Лимитед Device and method for manufacturing product protected from counterfeit, stream method of printing and metallic printing ink
RU2523474C2 (en) * 2003-08-14 2014-07-20 Джей Ди Эс ЮНИФЕЙЗ КОРПОРЕЙШН Scale for use in concealed protection

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EA005456B1 (en) * 2001-03-09 2005-02-24 Сикпа Холдинг С.А. The magnetic thin film interference pigment or agent, and a method for their manufacture, printing ink or coating composition material, security and application of such a magnetic thin film interference means
EP1950256A1 (en) * 2003-08-14 2008-07-30 JDS Uniphase Corporation Flake for covert security applications
RU2523474C2 (en) * 2003-08-14 2014-07-20 Джей Ди Эс ЮНИФЕЙЗ КОРПОРЕЙШН Scale for use in concealed protection
RU2456164C2 (en) * 2003-11-14 2012-07-20 Принтетч Лимитед Device and method for manufacturing product protected from counterfeit, stream method of printing and metallic printing ink
RU2326006C1 (en) * 2006-12-21 2008-06-10 Федеральное Государственное Унитарное Предприятие "Гознак" (Фгуп "Гознак") Protective element (alternatives), method of making it, counterfeit protected material and valuable document
WO2008141973A1 (en) * 2007-05-18 2008-11-27 Unilever Plc Monodisperse particles

Similar Documents

Publication Publication Date Title
Kolle et al. Mimicking the colourful wing scale structure of the Papilio blumei butterfly
RU2386540C2 (en) Element of protection, which comprises layer with variable optical properties and method of its manufacturing
CA2791160C (en) Moire magnification device
EP2049345B1 (en) Method for producing a multi-layer body, and multi-layer body
RU2333230C2 (en) Solid multilayer magnetic pigments and foil
EP2121337B1 (en) Security element with a micro-optical authenticity feature in an embossing lacquer
AU2005263239B2 (en) Anisotropic optical devices and method for making same
EP1853763B1 (en) Security element and method for the production thereof
US6841238B2 (en) Chromatic diffractive pigments and foils
US6759097B2 (en) Methods for producing imaged coated articles by using magnetic pigments
CA2686460C (en) Display and information-printed matter
CN1288674C (en) Multi-layered magnetic pigments and foils
US8889234B2 (en) Method of generating structural color
EP1741757B1 (en) Opaque pigment flakes containing symbols for covert security applications
CN102495525B (en) Optically effective surface relief microstructure and its manufacturing method
JP5037863B2 (en) Hidden security coating
US20120001116A1 (en) Magnetic multilayer pigment flake and coating composition
KR101029857B1 (en) Alignable diffractive pigment flakes
DE60005508T2 (en) special surface
DE102008031325A1 (en) Security element and method for its preparation
US9004540B2 (en) Security element
DE102006050047A1 (en) Transparent security element for security papers, data carrier, particularly valuable documents such as bank note, identification card and for falsification of goods, has transparent substrate and marking layer applied on substrate
AU2012322437B2 (en) Security devices
US7729026B2 (en) Security device with metameric features using diffractive pigment flakes
EA009829B1 (en) The security element with viewing angle dependent appearance