Printing ink or toner compositions, methods for use thereof and products derived therefrom

FIELD: chemistry.

SUBSTANCE: invention relates to magnetic compositions used as ink or toner for producing pigmented magnetic materials. The magnetic composition contains particles having a core made of magnetic material and a coating surrounding the core. The pigmented magnetic layer on the substrate has a Hunter Lab colour scale L-value of at least 50. The coating of each particle is sufficiently opaque so as to completely conceal the colour of said core or an additional coating under said coating. Described also is a method of forming a pigmented magnetic layer, the obtained articles, e.g. banknotes, the protective property of the magnetic layer for the banknote.

EFFECT: disclosed magnetic compositions contain particles which are coated such that they look white, substantially white or coloured, while providing the desired magnetic properties and opening up new possibilities of producing corresponding magnetic layers on substrates.

24 cl, 2 ex

 

The technical FIELD

The present invention relates to magnetic pigments, the composition of printing inks or toners, and products containing pigments, inks or toners, printed or marked otherwise.

The LEVEL of TECHNOLOGY

Magnetic compositions for printing is well known in the art. Traditionally, magnetic materials having suitable magnetic or electrical properties for use in the preparation of printing inks include fine metal powders of iron, Nickel, cobalt, chromium dioxide, gamma peroxide and ferrites, typically having a particle size in the micron range or higher. Otherwise use may be preferably applied to the substrate of the magnetic materials in the form of particles such as toner compositions) in order to obtain the protective properties. For example, some of the banknote can include on the surface of the soft lines or patterns of magnetic material. To test for the presence of the magnetic material can be used as a magnetic sensor.

Magnetic paints usually have a dark or black color, so they are perfect for just getting dark or black images. Some of the magnetic particles does not allow them to create a pure color, especially bright shades, due to the inherent magnetic material of dark color.

However, in the recently achieved success in the search for compositions of the toners, containing magnetic materials having a color or shade different from black. For example, the developed magnetic materials with one or more number of layers deposited, enveloping the magnetic particle core, thus giving the entire structure of the surface characteristics, which provides the transmission color. Such coated structures in the form of particles receive preliminary preparation of the magnetic substrate with the subsequent addition thereto of a previously captured particles, masking the first particles and adhering to the base. However, it may be difficult the formation of sufficient thickness masking layer to properly shaded dark or black color of the fundamentals of magnetic material. In addition, the adhesion of these two layers may not provide sufficient durability.

In other examples, a dark or black magnetic base can be mitigated or clarified by mixing a magnetic material, for example, in granular form, with other, lighter in color or shade, connecting, creating, thus, the heterogeneous composition of the magnetic base, with acceptable color, or tint, or, at least, color, or tint, which is easier to mask one or more surface layers. Such materials in the form of particles have a lower density core is inanaga material, and this can lead to the deterioration of the magnetic properties of particles, besides the fact that they still do not have sufficient color properties.

There are other alternative ways of masking the color of the magnetic particles. According to one example of the magnetic material in the form of particles can be applied using a chemical process vapor deposition, forming a structure of thin magnetic films. A thin film may be subsequently covered with a non-magnetic thin film to visually mask the presence of internal magnetic thin film. Such methods of application layers produce printing inks, which are relatively expensive to produce and still retain insufficient color property.

One clear indication that there is a need in the development of advanced magnetic inks, toners, dyes, or their components, having a color or shade different from black or other dark colors or shades, typical of most magnetic materials is the absence of color magnetography (see Handbook of Printed Media (Handbook of print media), Helmut Kipphan, Springer, 2001). In addition, there is a need to develop a slightly colored or tinted magnetic inks, toners, or dyes, including those that are white or substantially white, ilizhe painted, which is suitable for direct application to the substrate (for example, by direct printing). White magnetic inks, toners, or dyes would also be useful for mixing with other magnetic or non-magnetic inks, toners, or dyes to change their colors, aesthetic or magnetic properties. For example, in the field of protection of banknotes such inks, toners, or dyes can afford to give the notes more complex security properties, such as a complex magnetic signature or other machine-readable magnetic characteristics that are hidden characteristics, invisible to the naked eye.

The INVENTION

The present invention, at least in selected embodiments, its implementation, is to provide a composition suitable for application to a substrate, to obtain a magnetic layer on a substrate or otherwise part integral with the substrate.

The present invention, at least in selected embodiments, its implementation, is also creating method of creating a magnetic layer,

In some typical embodiments, implementation of the proposed composition for application to a substrate to form a pigmented magnetic layer deposited on a substrate and/or forming one unit with the specified substrate, and the composition includes:

(1) particles, including:

(i) a core consisting essentially of a magnetic material;

(ii) coating at least essentially enveloping the core, providing the formation of these particles when applying to the substrate a pigmented magnetic layer, having a value of L by colorimetric scale Hunter Lab at least 50;

(iii) possibly one or more additional coatings, each of which is located between the said core and the specified coating and/or at least essentially envelops the said coating;

(2) perhaps the liquid phase, which, if present, stores the specified particles at least partly in a suspended state;

(3) possibly one or more other magnetic or non-magnetic ink or toner.

In other typical embodiments of the invention proposed the use of the proposed structures to create a pigmented magnetic layer on a substrate or forming one piece with the substrate through the deposition of particles on the substrate or on the substrate material to provide adhesion of the particles to the substrate, and possibly to each other on the substrate.

In some other exemplary embodiments of the invention, a method of forming a pigmented magnetic layer, including the state of the application with the tava, described herein on a substrate, the particles adhered to the substrate or substrate material and may, together with the formation of the specified pigmented magnetic layer.

In some other embodiments, the invention proposed a pigmented magnetic layer is obtained by deposition of a composition described herein to the substrate, the particles adhere to the substrate and optionally to each other on the substrate.

In some other embodiments the invention, the proposed device, including a substrate and a deposited pigmented magnetic layer described here.

In some other embodiments of the invention banknote attach protective property, including pigmented magnetic layer described here.

In some other embodiments, the invention proposed a composition for application to a substrate for the formation of a pigmented magnetic layer on the substrate and/or forming one unit with the specified substrate, and the composition includes:

(1) particles containing:

(i) a core consisting essentially of a magnetic material;

(ii) coating at least essentially enveloping the core, which ensures the existence of these particles, when applying them to the substrate, a color or shade that differs from cotaminated core material;

(iii) possibly one or more additional coatings, each located between the said core and the specified coating and/or at least envelops the said coating;

(2) perhaps the liquid phase, which, if present, holds these particles at least partially in suspension (suspension);

(3) possibly one or more other magnetic or non-magnetic inks or toners.

DEFINITIONS:

Black: dark color or shade, having a value of 10 or less 10 to colorimetric scale Hunter Lab compared to a certain standard.

"Floor": any layer that is deposited or otherwise at least partially coats the particles with a magnetic core, so as to cover or substantially close particles. The coating can be applied directly onto the core particles or deposited on top of other coatings (coatings), previously deposited on the particles, or may even be formed between the existing floor and the engine in situ, for example, using a chemical reaction. In selected but not all embodiments of the invention, the coating can be completely opaque to mask or hide the color or shade material located directly under the floor, for example, the surface of the magnetic core.

Color color is - any color or shade, including black, grey, white, red, orange, yellow, green, blue, purple and shades, variants or mixtures. Colors include black and white as well as color or shades presented in a colour scheme of Hunter Lab, or when visual inspection as a result of selective absorption and/or transmission of material of certain wavelengths of the visible light spectrum. Color perception is usually a factor or human vision, color perception artificial system type of computer connected to the optical sensor.

Binding: any known technique of cross-linking, which is suitable to cause or to improve the adhesion of the particles of the composition according to the invention to the substrate. Such crosslinking occurs by oxidative methods or through the use of electromagnetic radiation such as ultraviolet radiation,

"Precipitation"/"sludge"/"application"/"apply" are interchangeable terms refer to any method or means for applying the composition according to the invention, or any form of toner or ink, on or in the substrate or substrate material, so that the composition of the toner, or ink at least partially adhering to the substrate or to the substrate or at least partially mingled with them. Predpochtite is) in accordance with the present invention that the deposition or application included the adhesion of the magnetic particles to the substrate or at least the superficial layer of the substrate material, and in selected embodiments of the invention the adhesion of the magnetic particles to each other on the substrate for forming the magnetic layer. The obtained magnetic layer may be on the substrate, essentially on the substrate and partially within the substrate or the substrate material, depending on, for example, absorbency, porosity or structure (laminated or composite structure) of the substrate material. However, in alternative embodiments the invention, the "deposition" or "application" may also include mixing the particles of the magnetic powder to the substrate, the substrate or surface layers or substrate. Mixed substrate material and the magnetic particles can provide the subsequent formation of the magnetic layer by printing, extrusion or other application of a mixture of magnetic particles / substrate material. Therefore, the method according to the invention and the products obtained by such methods cover the direct application of the composition or particles on the surface of the substrate and/or mixing of the particles with the substrate, possibly with subsequent processing. It can even lead to the fact that the magician is any layer is masked inside the substrate material or hidden in some other way by the substrate material.

"Pinning": promoting or enhancing adhesion of ink or toner to the substrate, for example, to print. Anchoring may include, at least in selected embodiments of the invention, heating the substrate and deposited material or ultraviolet irradiation, or may include initiating a chemical reaction between the substrate and the material. Also known other methods of fastening, such as mechanical fastening.

"Colorimetric scale Hunter Lab": a scheme known in the art, to correlate the degree of color or shade with a particular substance or material. The scale includes parameters to correlate values with the degree of whiteness or blackness, with additional values for individual colors or shades between white and black. Link offering more details Colorimetric Schema Hunter Lab, includes, but is not limited to, "The Measurement of Appearance" Richard S. Hunter, John Wiley & Sons, Publishers, New York, N.Y. - 1975, included in the present description by reference. Information related to Colorimetric scale Hunter Lab is also available in Hunter Associates Laboratory Inc., Virginia, USA www.hunterlab.com).

"Paint" means any liquid of any color, shade or substance, is suitable for application to a solid substrate to change the color, shade, or other experiences (e.g., reflective ability, the institutional capacity, gloss and so on) from the solid substrate. Preferably, the inks comprise the material of the magnetic particles in accordance with the purposes of the present invention. This definition does not detract from, or otherwise substitute other definitions that are well known in the art. Paint can be an emulsion or suspension, and may also be colorless, transparent or translucent, such as stains and varnishes, etc.

"Magnetic" is a physical property of the material. Magnetic or namagnichivaemost materials that may be used include metals type cobalt, iron and Nickel; metal alloys, such as aluminum, cobalt, copper, iron, lead, magnesium, Nickel, tin, zinc, antimony, beryllium, bismuth, cadmium, calcium, manganese, selenium, titanium, tungsten and vanadium and mixtures thereof; metal mixtures, which contain oxides of metals of the type of aluminum oxide, iron oxide, copper oxide, Nickel oxide, zinc oxide, titanium oxide and magnesium oxide; ferrite; and mixtures thereof. The magnetic material may be a magnetic material of any type, for example, iron, cobalt, Nickel; magnetic alloys, such as Ni-Co or Nd-Fe-B; inorganic oxides, such as Fe2O3, Fe2O3dioxide chromium CrO2the ferrites MFe2O4(where M is the ion or mixture of ions selected from the group consisting of Mg2+/sup> Ca2+, Sr2+BA2+, Mn2+, Co2+, Fe2+, Ni2+, Cu2+, Zn2+, etc), grenades And3In5About12(where a is a trivalent rare earth ion, or a mixture of trivalent rare-earth ion and B - ion or mixture of ions selected from the group comprising Al3+, Cr3+, Fe3+, Ga3+Bi3+etc), the hexaferrite MFe12O19where M is selected from the group of divalent ions of CA2+, Sr2+BA2+and so, perovskites, etc. In the present invention can use any noteworthy material for imparting to the particles described here, special magnetic properties. The specified magnetic property can, for example, be strong (super-)paramagnetism; ferromagnetism; ferrimagnetism; antiferromagnetism; antiferromagnetism etc. Also, the material may be paramagnetic or diamagnetic. The material can be magnetometer, low coercivity, with an average coercivity or strong magnetic type, or it can be available for detection by the Barkhausen effect. The magnetic property may, in addition, to ensure that the residual magnetism between 0 OE and up to 10000 OE.

"Magnetic layer" means any layer on the surface or inside (i.e. forming part of) the substrate obtained by the deposition or coating of the particles, or the composition according to izobreteny the substrate, caused by known methods of deposition or coating, or by mixing the particles or compositions according to the invention with the substrate material. The magnetic layer may include a substrate material, and can be placed under or above the substrate layers or other layers in the layered material or a composite structure. The magnetic layer usually retains magnetic properties due to the magnetic nature of the particular material of which it consists. The magnetic layer may also contain a single layer of particles on the substrate or may include multiple layers, obtained thanks to the adhesion of particles to each other on the substrate or inside it. The magnetic layer may also be formed by mixing the composition according to the invention to the substrate, with some possible further processing, such as, without limitation, deposition, printing or extrusion.

"On being black"/"Almost black": a dark color or shade, having a value of 30 or below 30 on a Colorimetric scale Hunter Lab no comparison with a specific pattern.

Particle is any particle having a diameter of from 0.1 to 10,000 nm and consisting of (i) a core consisting essentially of magnetic material, possibly with minor fractions of other materials or impurities; (ii) coating, essentially enveloping the core, typically having a color or shade that differs from the W hat is the core material; and (iii) possibly one or more additional coatings, each located between the core and the coating and/or essentially envelops the floor. In accordance with the invention, the particle has an average diameter in the nanometer range, preferably from 1 to 1000 nm. However, the particle size may be greater than 1000 nm, or less than 1 nm. Regardless of their size, these particles can be referred to in this description as "nanoparticles".

"Pigment" means any substance having any desired color or shade, including white or black or any color that is indicated on the Colorimetric scale Hunter Lab. Alternatively, the pigment may have a color or shade in other areas of the electromagnetic spectrum outside the visible spectrum, such as the ability to reflect ultraviolet or infrared rays. The optical properties of the pigment (for example, absorbance, transmittance, radiation) may depend on its application. In some versions of the invention, the pigment can be called solid particles having an appropriate particle size for use in a paint, enamel, dye or the composition for application to a substrate in accordance with the present invention. In selected embodiments of the invention the crushed solid particles are in the form of particles, and the particles have a core, on the expectation of a magnetic material, and the floor, giving the particles of the desired color or tint. The color or hue of the pigment can be white or substantially white or may have a more specific color, such as, but not limited to:

Blue pigments: cobalt blue, cerulean blue, alkali blue lacquer, peacock blue lacquer, triphenylmethanol blue lacquer, not containing metals phtalocyanine blue, phtalocyanine blue, sky blue, indanthrene blue (RS, BC), Indigo, etc.

Magenta pigments: cobalt purple, manganese purple, persistent In purple, methylviolet lacquer, etc.

Green pigments: chrome green, zinc green, chromium oxide, Viridian (gidrirovanny form of chromium oxide), emerald green, pigment green B, naphthol green B, green gold, acid green lacquer, malachite green lacquer, phtalocyanine green etc.

Red pigments: Crocus, minium, silver, vermilion, cadmium red, cadmium red mercury, arimana cinnabar, sustainable red 4R, paranitroaniline red, scarlet, parachlorometaxylenol red, lithol durable scarlet G, brilliant durable scarlet, vermilion Western, brilliant Carmine BS, sustainable red (F2R, F4R, FRL, FRLL, F4RH), durable scarlet VD, Vulcan strong ruby red, lithol red, lacquer red (C, D), antechinomys B, brilliant scarlet G, lithol ruby GK, steady red F5R, brilliant Carmine 6B, pigment scarlet 3B, Bordeaux 5B, toluidine red-brown, sustainable Bordeaux F2K, solar Bordeaux BL, Bordeaux 10B, BON red-brown light, BON red-brown medium, eosin lacquer, rhodamine lacquer, rhodamine lacquer Y, alizarin lacquer, thioindigo red B, thioindigo maroon and so on

Yellow pigments, Naphthol Yellow S, Hansa Yellow (10G, 5G, G), cadmium yellow, yellow iron oxide, yellow ochre, arsenic sulfide, lead cyanamide, plumbat calcium, Hansa Yellow (GR, A, RN, R), Pigment Yellow L, Gasoline Yellow (G, GR), sustainable Yellow (NCG), Vulcan solid Yellow (5G, R), Tartrazine lacquer, Quinoline Yellow lacquer, Anthracene Yellow BGL, etc. Colored pigments can be produced by the mixing or combination of colors, such as mentioned above, with a white substance, such as, without limitation, a metal oxide or an organic polymer, to obtain thus substances suitable for a coating for application to a magnetic particle core. Alternatively, the colored layer can be applied to the particles so that he was either under the white floor, or on top of the white coating, depending on the core material. Any pigment can be used in accordance with the purposes of the present invention, for example, to obtain a coating material or as it is part for coating the magnetic core, with the formation of particles for use in the composition according to the present invention.

"Pigmented magnetic layer, any layer formed on the substrate using a composition comprising particles according to the invention, while providing the adhesion of these particles to the substrate or, possibly, to each other on a substrate to form a layer. The layer exhibits magnetic properties, and also has a color, which is often different from the color of the core material or particles used for the formation of the layer.

"Preferably"refer to preferred embodiments of the invention or precedes the mention of them.

"On being black"/"Almost black": a dark color or shade, having a value of 30 or below 30 on a Colorimetric Scale Hunter Lab no comparison with a specific pattern.

"On being white"/"Almost white: light color or shade, with a value of 70 or above 70 on a Colorimetric Scale Hunter Lab no comparison with a specific pattern.

Matte: any solid or substantially solid material having at least one layer of any structure or configuration that is suitable for applying to a composition according to the invention with the purpose of applying to the substrate particles to form a magnetic layer on the substrate and/or forming a whole with the spoon. The substrate may include any material with any surface modifications or design layer. For example, the substrate may include a material selected from one or more substances that are not limited to: paper, plastic, metal, metal alloy, wood, glass, resin and rubber.

"Suspension" - a mixture of solid particles and liquid, with solid particles include at least some of the particles that remain suspended in the liquid for some time without a noticeable drop in the liquid under the action of gravity. Therefore, such particles can be trapped by their own buoyancy or other forces acting on the particles from the liquid. In any suspension part or even all of the particles can settle on the bottom of the suspension under the action of gravity or other forces. This does not affect the fact that the mixture is still a suspension.

"Toner": any powder material according to the invention, or known in the art, with the magnetic properties, so it's affected by the magnetic field, and which is then subjected to precipitation, at least in part, on the substrate for printing purposes. The toner may be in dry powder form, or may include a liquid phase that is appropriate to save at least part of the powder material in suspension. This definition is not amalee the or otherwise replaces other definitions, which are generally known in the art.

White: light color or shade, having a value of 90 or more than 90 on a Colorimetric Scale Hunter Lab compared to a certain standard.

DETAILED description of the INVENTION

The authors of the present invention, showing the inventive activity, successfully developed compounds for use as magnetic inks or toners suitable for the formation of a pigmented magnetic layer on the substrate or in the form of a single whole with the substrate. The compositions include particles of the magnetic powder, which, at least when applied to the substrate, have the color or shade of the surface, which is different from a dark or black color of many well-known magnetic materials. Indeed, the compositions according to the present invention include particles of the magnetic powder containing a core consisting essentially of magnetic material, together with the coating on the core, which largely masks the color of the magnetic material. The resulting compositions, at least in selected embodiments of the invention, can be white, being white or color, and compositions well suited for the deposition on the substrate with the formation of the magnetic layer. The inventors are unaware of any other compounds that exhibit the same characteristics and white and color combined with desirable magnetic properties for use in printing or other deposition on a substrate, than the toner. Particles of the magnetic powder compositions according to the present invention are particles, which preferably have an average diameter of from 0.1 to 10,000 nm, so they largely fall into the nanometer size range (i.e. they can be considered as "nanoparticles"). The use of such particles has advantages compared with particles of micron size. Such advantages include, but are not limited to, vacuum deposition of particles in suspension in the liquid, which in turn makes the material more suitable for processes in solution, such as additional modification and the subsequent application. The particles include a core comprising or essentially consisting of magnetic substances, possibly including minor amounts of other materials or impurities. In engineering there are many magnetic materials, which have a black or dark colors, especially those that contain solid magnetic materials. The particles include at least one coating, essentially enveloping the core, and after application to the substrate for the formation of a layer on it have a color different from the color of the magnetic material core. For example, the layer may look at least essentially white in color or shade, or may have a darker color. Therefore, in selected embodiments, the OS is supervising the invention, the coating on the particles has a thickness of, sufficient to essentially obscure any dark or black color or tint of the magnetic material core.

When you want to give particles of the desired surface adhesion or optical properties, may also be present other covering layers between the core and essentially white or colored layer or between the enveloping essentially white or colored layer. However, such additional covering layers are not necessarily required for providing the desired color qualities for any particles in the compositions according to the invention or obtained for the magnetic layers formed on the substrate. Thus, at least in selected embodiments of the invention, the compositions include a very simple structure of the particles, because they include only magnetic core and a single layer coating, with only the coating layer capable of imparting the desired color or the visual characteristics of the particles (and specifically the magnetic layer formed by deposition of particles on the substrate material) without deterioration of the magnetic properties of the particles provided by the core material. The invention, at least partially, in option, in which such particles can be applied in areas different from, say, a therapeutic, diagnostic or research applications, and can FA is automatically used in forming the magnetic layers, such as are obtained by the printing method of deposition on the substrate.

It was unexpectedly found that compositions according to the invention exhibit desirable properties when applied to a substrate, for example, using known printing methods or other methods for forming high-quality and durable magnetic layer. The particles have a magnetic field of sufficient intensity to deposition, adhesion or fixation to the substrate, and their low weight reduces the inertia required for deposition. Formation of the magnetic layer can be, therefore, fast and efficient. In selected embodiments the invention, the color or hue of the particles related to the main floor, makes the compositions according to the invention suitable for a wide range of applications in printing. Particles can be used in their natural form, in which the coating has a color of the particles. Such particles can also be mixed with other magnetic or non-magnetic inks or colored powder materials, to get other colors or shades. Thus, the compositions according to the invention provide the ability to change (for example, to lighten or darken the existing color of printing ink or powder materials and to expand the color gamut.

In selected embodiments of the invention, the compositions according to the but the invention satisfy the needs of the printing process, production of printing inks and toners in lighter colors or essentially white magnetic toners and inks. Once the coating may itself be sufficiently opaque to at least essentially hide the color of the material of the magnetic core under it, and this is a significant progress in the field of engineering. For example, particles in the compositions of the present invention can have a single floor, which has a white or light color, sufficient to mask the darker color of the material of the magnetic core. Consequently, it is possible to obtain the magnetic layers of white, essentially white color or light color, using the compositions of the present invention, without the necessity of compounds, including multilayer particles or other types of particles, known in the field of engineering, the manufacture of which can be more difficult and expensive.

In other embodiments of the invention, the particles may have a coating rather darker in color than white or substantially white color for camouflage dark or black, core material, which consists primarily of the magnetic material. Although selected embodiments of the invention described herein relate to compositions or pigments, including particles with a white or substantially white coating to create magnetic layers, the color to which that is white or substantially white, the invention is not limited. Indeed, the invention relates to any composition or pigment comprising particles consisting essentially of magnetic material having a coating of white color, essentially white or darker colors, with sufficient opacity or thickness or the ability to close or substantially close to the color of the magnetic material or layer that is located directly below the white, being white or colored layer. The inventors have found that sharing such fine magnetic particles of the nucleus in combination with the closing layer is sufficient to impart highly desirable properties of the compositions of the pigments of the present invention, providing their applicability in a wide range of technologies deposition and printing. Desirable characteristics exhibited by compounds and pigments according to the invention, at least partially due to the small size of the particles relative to the magnitude of the intensity of their magnetic fields.

In one embodiment, the invention proposed a composition for application to a substrate to obtain a pigmented magnetic layer on the substrate and/or forming one unit with the specified substrate, the composition includes:

(1) particles, each of which includes:

(i) the core, with the worthwhile essentially of magnetic material;

(ii) coating at least essentially enveloping the core, ensuring the formation of these particles when applying them to the substrate a pigmented magnetic layer on a substrate having a color or shade that differs from the color of the magnetic material core. In other selected embodiments of the invention the coating is at least essentially enveloping the core, provides the formation of these particles, when applying them to the substrate, a pigmented magnetic layer having a colorimetric scale Hunter Lab value L at least 50, or at least 80, or even at least 95. Being simple in nature, such compositions provide excellent opportunities for printing and other technologies, including the formation of pigmented magnetic layer on the substrate, and these compounds relative simple to manufacture and use. In addition, the compositions of the present invention enable you to generate excellent pigmented magnetic layers, which can be white, being white or relatively light material of the particle core. This important development focused on meeting the long felt needs in the art useful and really white or almost white compositions for printing inks or toners. The inventors found the or, the compositions described herein, when they include particles having only one floor, are suitable for use in printing, which requires a white, almost white or light colored printing inks and toners. It was unexpectedly found that the only coverage may be sufficient to at least essentially to mask a darker color or shade of the magnetic core material particles.

In selected embodiments of the invention each of the one or more than one additional coating may be located between the core and the coating and/or additional coverage (coverage) can essentially envelop white coating as required to achieve the desired surface color, reflectivity, or other properties or qualities of the particles. In other variants can be proposed surface treatment for improving the characteristics of particles in suspension the suspension or to improve the fluidity of particles in dry form or in suspension.

The compositions according to the invention, comprising the above-mentioned particles may be in dry form, as is typical of many of the toners in the field of technology, or, alternatively, may be mixed with the liquid phase to form a slurry or suspension of at least part of the particles in the liquid phase. The need in the liquid phase depends on the PR, the birth and methods of deposition and the substrate, which will be deposited composition. In engineering there are many ways deposition of toner or ink in a dry or liquid suspended form on a substrate, and it is assumed that the compositions according to the invention is suitable for most or all of these methods.

In addition, the particles used in the compositions of the present invention can be obtained in any suitable way. For example, the core particles can be obtained selected methods of granulation or alternative from soluble precursors, limited in size by growth inhibitors. In the case of soluble precursors them into the material of the solid particles can be achieved, for example, thermal, chemical, acoustic decomposition or chemical or electrical oxidation. Two illustrative examples of such methods are shown in Burke et al. (2002) Chem. Mater. 14, 4752-4761 and these links are included here by reference. Other illustrative examples of ways to obtain coated particles for use in the present invention are presented in Burke et al. (2002) Chem. Mater. 14, 4752-4761, as well as in Vestal and Zhang (2003) Nano Letters, 3(12), 1739-1743, also incorporated here by reference. Typically, such methods to obtain coated particles include reactions in liquid solution or suspension. Also in the field of other methods known in the art that n is include liquid solutions or suspensions. Such methods may include, for example, dry deposition material pigment, for example, by chemical vapor deposition.

The compositions according to the invention can additionally include one or more than one other magnetic or non-magnetic inks or toners, for example, having a color or shade that differs from the color or shade of the particles. The mixing of the compositions described herein, with other colors or compositions in dry powder or liquid form may provide an opportunity for the production of magnetic layers having different color, tint or reflective properties. Thus, the invention includes all compounds according to the invention, comprising coated particles, as described above, and additionally mix all of such coated particles with other inks, dyes, diluents, fillers, etc.

Use white or substantially white particles in the production of magnetic layers according to the invention represents a particularly preferred property. Particle inks or toners according to the invention preferably consist essentially white coating that is opaque enough to hide the color of the magnetic core, or opaque enough to hide the color of any additional coverage (if available), located directly under the specified blymphocytes, at least on visual inspection of the particles. The invention relates to the use of particles that include a coating that allows them to look white (having a value of L equal to 100 on a Colorimetric Scale Hunter Lab), as well as those that look almost white (for example, having a value of L at least 95 on a Colorimetric Scale Hunter Lab) or essentially white color (for example, having a value of L at least 70 on a Colorimetric Scale Hunter Lab), and additionally the ones that look even less white (with size L 50-70 on a Colorimetric Scale Hunter Lab). The degree of whiteness, which have particles of the magnetic powder due essentially to the white floor, can, thus, be substantially altered. The invention concerns a composition comprising particles having at least one coating layer with the value of L at least 50 on a Colorimetric Scale Hunter Lab, and their applications. The invention also relates to compositions comprising particles having at least one layer of coating, which when applied to a substrate for forming therein a magnetic layer create a magnetic layer with a value of L at least 50 on a Colorimetric Scale Hunter Lab.

Particles can be of any irregular shape, or alternatively, may be essentially spherical. Typically, each particle may have a size in the range of the region from 0.1 to 10,000 nm in diameter, preferably 10-80 nm in diameter. White, being white or colored coating on each particle can have any thickness suitable to give the desired aesthetic properties of the particles or the magnetic layer formed by coating on a substrate, comprising these particles. Preferably the coating has an average thickness of 1 to 200 nm, more preferably from 5 to 50 nm. Such preferred thickness of the coating appears to cause an increase in the number of particles having particularly desirable color and magnetic properties.

The core of each particle can include any material that exhibits magnetic properties. Such materials include, but are not limited to, at least one material selected from the group consisting of Fe, Ni, Co, recoverable metal oxide, iron oxide, Nickel oxide and ferrite of the formula MFe2O4in which M is a divalent metal ion or a mixture of divalent metal ions. Preferably the core is made of magnetic material or a mixture of magnetic materials. However, the core may optionally include small amounts of other materials or impurities, obtained, for example, in the production process of the particles.

Floor, essentially enveloping each particle can include any substance, mixture or element, that is to stick with a reasonable efficiency of the magnetic core or the intermediate layer) and which has the desired degree of whiteness or color Scale Hunter Lab. Such materials include, but are not limited to, metal compounds (e.g., silicon dioxide [SiO2], chalk [calcium carbonate, CaCO3], titanium dioxide [titanium dioxide, TiO2], zirconium dioxide [zirconium dioxide, ZrO2}, barite [barium sulfate, BaSO4], gypsum [calcium sulfate, CaSO4], glass powder, zinc oxide [ZnO] and zinc sulfide [ZnS]) and organic polymers (for example, possibly functionalized polyisobutylene may functionalized polyethylene, possibly functionalized polystyrene, latex). Other examples of white covering material may include a resin, ceramics, etc. Any of these coating materials may be mixed or replaced by any pigments, as described herein or known in the technique.

In selected embodiments of the invention the coating of each particle may include a material with a high refractive index material with a high covering power, a material with a high dissipation factor, material with high opacity, a metal oxide or an organic polymer.

In addition, the compositions of the present invention the liquid phase may include any liquid material, or mixtures thereof, suitable to maintain the particles at least partially in suspension. The liquid phase may include, but are not limited to, any aqueous or organic is actuarial, which preferably does not cause corrosion or otherwise impedes the deposition of particles on a substrate.

In other embodiments implementing the invention includes the use of compositions according to the invention to obtain a pigmented magnetic layer on a substrate or in a single whole with the substrate, for example, deposition of particles of this composition on the substrate. This application extends to any described herein, the composition according to the invention. In accordance with such applications, a suitable substrate may include any item with any matrix, providing adhesion of the particles for forming therein the magnetic layer. For example, the substrate materials can be selected from an unlimited group comprising paper, plastic, metal, metal alloy, wood, glass, resin and rubber. In the case of paper, plastic or other material substrate ultimately may be intended for use, for example, as a banknote, the magnetic layer provides a protective property of the banknote.

In other embodiments of the invention, a method for formation of pigmented magnetic layer comprising a stage of applying a composition described herein on a substrate, the particles stick to the substrate or substrate material and possibly to each other, about the education, thus, pigmented magnetic layer.

Stage application can include any application method known in the art. For example, the stage of the application may include:

if necessary, mixing the particles with a liquid in order to cause the particles at least partially suspended in a liquid with education, thus, suspensions;

the introduction of the suspension into contact with the substrate or substrate material, possibly in the presence of a magnetic field;

removal of the applied suspension at least part of the liquid and, if necessary, securing the particles to the substrate.

Stage removal can be active stage, for example, including heating, cooling, absorption, microwave exposure, etc., or, alternatively, the stage of removal may be passive, e.g., evaporation or capillary effects. Therefore, the stage of removal may include any mechanism that ultimately leads to the reduction of the liquid phase in suspension.

Alternatively, the stage of application may include:

the contacting of the particles, at least essentially in dry form with the substrate, possibly in the presence of a magnetic field;

if necessary, the fixing of the particles on the substrate or inside it.

Alternatively, stage applying the WMS is to include:

the binding of the particles to the substrate, preferably by oxidation or UV crosslinking.

In any method described in the present description, each stage of fastening may include, for example, heating the substrate and deposited particles. Other methods of anchoring may include, but are not limited to, chemical or electrostatic mechanisms of adhesion of particles to the substrate. Consolidation can stimulate or improve the degree or strength of adhesion of particles to the substrate and/or to each other.

According to an additional variant implementation of the invention includes a magnetic layer obtained by applying a composition described herein to the substrate, to ensure adhesion of the particles of the composition to the substrate and possibly to each other on the substrate. The magnetic layer according to the invention can be obtained by applying the composition according to the invention by any known method for the deposition of the magnetic material in the form of particles. As one example, such methods may include high technology printing is well known in the technical field in which to create the desired image are raised surfaces coated with ink. In engineering there are many other printing methods, most of which are applicable for the deposition of particles on a substrate in accordance with this from what rutenium.

Additionally, the invention includes a product containing the substrate and the pigmented magnetic layer according to the invention. In preferred embodiments, the implementation, the substrate may be a banknote, and the magnetic layer can give banknote security feature. For example, the magnetic layer may have a color or shade different from black or dark colors, can be conveniently and inconspicuously integrated into the structure or surface of the banknote.

It should be noted that the magnetic layers according to the invention, used to create protective properties on the notes, not restricted to those that have some special color ink, or toner, or any particular form, shape or configuration. Indeed, the protective properties of the banknotes received by the use of magnetic layers according to the invention, may include any conceivable form, shape or configuration, and any conceivable combination of colors and shades of inks or toners. For example, the protective properties of the banknote may include special shape of the magnetic paint, find ("read") only special pre-configured devices reading the magnetic signatures, for example, suitable for distribution to retailers. In other embodiments, the implementation of protective with the STS banknotes, includes magnetic layers according to the invention, can include a wide range of colors, or multiple or overlapping magnetic layers according to the invention, to obtain, thus, more complex security properties, for example, arranged in the form of a color picture or simulated pictures etc. Color and/or shades used formulations can be adjusted to change the degree of visibility of the protective properties on the notes.

In other additional embodiments implementing the invention relates to pigments, comprising or consisting of any of the compounds or particles, are described and discussed in the present description. Indeed, the pigments can be white, being white or colored, depending on the materials used for coating particles. The pigments according to the invention, can be used in dry form, or they can be mixed with any substance carriers, diluents or excipients required for the desired application of pigment.

EXAMPLES

Example 1

There were prepared two composition for application to a substrate to create a pigmented magnetic layer on the substrate. The first composition for application to the substrate consisted of yellow paint on polyester substrates and particles of Fe3O4without coverage. Pigmented magnetic layer on the substrate obtained is output from the first composition, had a yellow-green color. The second composition for application to the substrate consisted of yellow paint on polyester substrates and particles comprising a core of Fe3About4and a coating of polymethylmethacrylate (PMMA). The particles with the coating were obtained using the methods listed on p.16-17. The content of particles with a coating composition for application to the substrate was 15%. Pigmented magnetic layer on the substrate, obtained by application of the second composition had a yellow color. Below is the measured Lab values obtained for pigmented magnetic layer yellow:

L*/a*/b*=72,61/4,20/65,99

Example 2

There were prepared two composition for application to a substrate to create a pigmented magnetic layer on the substrate. The first composition for application to the substrate consisted of yellow paint on polyester substrates and particles of γ-Fe2O3without coverage. Pigmented magnetic layer on the substrate, obtained by applying the first composition, had an orange color. The second composition for application to the substrate consisted of yellow paint on polyester substrates and the particles comprising the core of the γ-modification of Fe2About3and a coating of PMMA with the addition of titanium oxide. The particles with the coating were obtained using the methods listed on p.16-17. The content of particles with a coating composition for application is and the substrate was 15%. Pigmented magnetic layer on the substrate, obtained by application of the second composition had a yellow color. Below is the measured Lab values obtained for pigmented magnetic layer yellow:

L*/a*/b*=81,94/14,47/86,10

Although the invention has been described with reference to specific embodiments of and examples of the compositions, their use, how to create magnetic layer and the magnetic layer according to the present invention, the expert it is clear that the scope of the invention described and claimed here, fall and other such compounds, their use, how to create magnetic layers and magnetic layers. The intention of the applicants is to include all such additional embodiments of the scope of the attached claims.

1. Composition for application to a substrate for the formation of a pigmented magnetic layer on the substrate and/or forming one unit with the specified substrate, including:
(1) particles, each of which includes:
(i) a core consisting essentially of a magnetic material;
(ii) coating at least essentially enveloping the core, which ensures the formation of these particles, when applying them to the substrate, a pigmented magnetic layer, having a value of L by colorimetric scale Hunter Lab, is at least equal to 50, p is ICEM coating of each particle is sufficiently opaque to to completely hide the color of the specified kernel or any additional coverage if it is available under the specified coating; and
(iii) possibly one or more additional coatings, each of which is located between the said core and the specified coating and/or at least essentially envelops the said coating;
(2) perhaps the liquid phase, which, if present, holds these particles at least partially in suspension; and
(3) possibly one or more other magnetic or non-magnetic inks or toners.

2. The composition according to claim 1, in which the coating ensures the presence of particles of size L by colorimetric scale Hunter Lab, is at least equal to 80, when applied on a substrate for formation of a pigmented magnetic layer.

3. The composition according to claim 2, in which the coating ensures that the cores of size L by colorimetric scale Hunter Lab, is at least equal to 95, when applied on a substrate for formation of a pigmented magnetic layer.

4. The composition according to claim 1, in which the particles when their visual inspection look white or essentially white.

5. The composition according to claim 1, in which the particles when their visual inspection look colored.

6. The composition according to claim 1, in which the core of each particle has a diameter of from 0.1 to 10,000 nm, preferably from 10 to 80 nm.

7. The composition according to claim 1, in which the aircraft is their each particle has an average thickness of 1 to 200 nm, preferably from 5 to 50 nm.

8. The composition according to claim 1, in which the core contains at least one substance selected from the group consisting of Fe, Ni, Co, recoverable metal oxide, iron oxide, Nickel oxide and ferrite of the formula MFe2O4where M is the ion of the divalent metal or a mixture of ions of bivalent metals.

9. The composition according to claim 1, in which the coating of each particle comprises a material with a high refractive index material with a high degree of opacity, a material with a high light-scattering ability, material with high opacity, a metal oxide or an organic polymer.

10. The composition according to claim 9, wherein said material is selected from at least one substance from the group comprising silicon dioxide [SiO2], chalk [calcium carbonate, caso3]Titania [titanium dioxide, TiO2]Zirconia [Zirconia, ZrO2], barite [barium sulfate, BaSO4], gypsum [calcium sulfate, CaSO4], glass powder, zinc oxide [ZnO] and zinc sulfide [ZnS].

11. The composition according to claim 9, in which the polymer is an organic polymer selected from the possible functionalized polyisobutylene may functionalized polyethylene may functionalized polystyrene and latex.

12. The composition according to claim 1, in which the liquid phase comprises water or an organic solvent.

13. The use of the composition according to claim 1 to create a pigmented magnetic layer located on the substrate or formed integral with the substrate, by deposition of particles on the substrate or on the substrate material in such a manner as to cause the adhesion of particles to the substrate and possibly to each other on the substrate.

14. Use item 13, in which the substrate includes a material selected from paper, plastic, metal, metal alloy, wood, glass, resin and rubber, or any combination thereof.

15. The application 14, in which the substrate is intended for use as a banknote.

16. Method of forming a pigmented magnetic layer, which includes stage:
applying to the substrate the composition according to claim 1, the particles stick to the substrate or substrate material and possibly to each other for forming the thus specified pigmented magnetic layer.

17. The method according to clause 16, in which stage of the application includes:
if necessary, mixing the particles with a liquid in order to cause the particles at least partially suspended in the liquid for formation thus suspension;
the contact of the suspension with the substrate or substrate material, possibly in the presence of a magnetic field;
removing at least part of the liquid from the deposited slurry and,
when neo is needed, the fixing of the particles on the substrate.

18. The method according to clause 16, in which stage of the application includes:
contact particles, at least essentially, in dry form, with the substrate, possibly in the presence of a magnetic field; and
if necessary, the fixing of the particles on the substrate or inside it.

19. The method according to clause 16, in which stage of the application includes:
the crosslinking between particles and substrate preferably by oxidation or UV crosslinking.

20. Pigmented magnetic layer is obtained by deposition on a substrate structure according to claim 1, the said particles adhere to the substrate and possibly to each other on the substrate.

21. Device, including a substrate and a pigmented magnetic layer according to claim 20, besieged it.

22. The product according to item 21, which is a banknote, and the magnetic layer provides a security feature for banknotes.

23. The protective property of the banknote, which includes pigmented magnetic layer according to claim 20.

24. Composition for application to a substrate for the formation of a pigmented magnetic layer on the substrate and/or forming one unit with the specified substrate, including:
(1) particles, each of which contains:
(i) a core consisting essentially of a magnetic material;
(ii) coating at least essentially enveloping the core, which ensures the existence pointed to by the x particles, when applying them to the substrate, a color or shade that differs from the color or shade of the magnetic core material and the coating of each particle is opaque enough to completely hide the color of the specified kernel or any additional coverage if it is available under the specified coating; and
(iii) possibly one or more additional coatings, each of which is located between the said core and the specified coating and/or at least essentially envelops the said coating;
(2) perhaps the liquid phase, which, if present, holds these particles at least partially in suspension; and
(3) possibly one or more other magnetic or non-magnetic inks or toners.



 

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FIELD: chemistry.

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or

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