DE102016006932A1 - Security element for an object to be protected and method for producing such a security element - Google Patents

Abstract

The invention relates to a security element for an object to be protected, such as. As a security paper, document of value or the like, the
a substrate (2) having a top surface (3) comprising a patterned portion (4) and a color layer (5, 16) printed on the patterned portion (4) and having a plurality of first pigments (10) formed as metal pigments , having,
wherein the first pigments (10) are arranged on the lower side (13) of the ink layer (5, 16) facing the upper side (3) of the substrate (2) along the structured section (4),
wherein the printed ink layer (5, 16) has, in addition to the first pigments (10), second pigments (11), which are formed as magnetic pigments, the second pigments (11) due to a magnetic field during the fixation of the printed ink layer (5, 16 ) are arranged on the upper side (3) of the substrate (2) facing away from the upper side (14) of the ink layer (5, 16) in a predetermined pattern (15).

Description

The invention relates to a security element for an article to be protected, such as a security paper, document of value or the like comprising a substrate having a top surface comprising a structured portion and a color layer printed on the structured portion having a plurality of first pigments as metal pigments are formed, wherein the first pigments are arranged on the upper side of the substrate facing the underside of the ink layer along the structured portion.

In such a security element, for example, when viewed from one side, there is a well-perceptible reflection layer which is formed by the first pigments. However, the visually perceptible impression of such a color layer when viewed from the other side is worse and in particular less brilliant. Furthermore, such a security element is also easily copied.

Proceeding from this, it is an object of the invention to develop a security element of the type mentioned so that the difficulties described are completely eliminated as possible.

According to the invention the object is achieved in a security element of the type mentioned in that the printed ink layer next to the first pigments second pigments, which are formed as magnetic pigments, wherein the second pigments due to a magnetic field during the fixation of the printed ink layer on the top of the substrate facing away from the top of the color layer are arranged in a predetermined pattern.

By the second pigments, a further optical effect independent of the optical effect caused by the first pigments can be provided when viewed from the second side, so that the recognition of the security element is increased. Moreover, it is possible to provide an exact registration of the pattern to the structured portion provided with the first pigments, which can not be achieved in an attempted copying of the security element by additionally forming the pattern on the upper side in a further process step in the same quality ,

The arrangement of the second pigments in a predetermined pattern is understood to mean, in particular, a predetermined arrangement and orientation of the second pigments.

In the case of the security element according to the invention, the first pigments can be arranged on the underside of the color layer such that they form a reflection or mirror layer. A mirror layer formed in this way can hardly be distinguished from a conventional metallization obtainable by vapor deposition.

Furthermore, the predetermined pattern in the security element according to the invention can be present in a registration with the structured section. In this case, an extremely high accuracy is achieved, which can not be achieved by methods with two separate steps.

The first pigments are advantageously non-magnetic or not magnetizable. In particular, the first pigments have no ferromagnetic properties. This makes it possible to ensure that the first pigments are arranged on the underside of the color layer during production, while the second pigments are arranged substantially at the top of the color layer.

In the case of the security element according to the invention, the substrate can have an embossing lacquer layer into which the structured section is embossed. The embossing can be done by hologram embossing. Furthermore, the embossing lacquer layer may be a UV embossing lacquer layer.

The structured section can also be referred to as a relief structure. The relief structure may be formed as a diffractive structure (eg, a hologram, a hologram lattice image, or a hologram-like diffractive structure) as an achromatic structure (eg, a matte structure, a micromirror array, a blazed grating with a saw-toothed ridge profile), or a Fresnel lens array be.

The first pigments are in particular formed as platelet-shaped metal pigments. Furthermore, the first pigments may be formed as platelet-shaped aluminum pigments.

The first pigments may be used in the same or similar manner as the pigments of the WO 2005/051675 A2 be formed described metal pigment compositions. In particular, the description on page 11, line 10 to page 13, third paragraph of the WO 2005/051675 A2 to refer. The first pigments may include, for example, aluminum, stainless steel, nichrome, gold, silver, platinum and / or copper. The average particle diameter is preferably in a range of 2 to 50 μm, more preferably in a range of 5 to 15 μm, as measured by a Coulter LS130 laser-dosing granulometer.

The first pigments may also be prepared according to the pigments from the metal-pigment compositions according to the WO 2013/186167 A2 and / or in the WO 2011/064162 A2 be formed effect pigment compositions described.

The substrate is designed in particular as a transparent substrate.

The second pigments may be magnetic pigments or magnetizable pigments. In particular, the second pigments may have ferromagnetic properties. Furthermore, the second pigments may be formed as the pigments used in the EP 2 792 500 A1 or in the US 7,517,578 B2 are described.

Protected items include, for example, security papers, identity cards or documents of value (such as banknotes, chip cards, passports, identification cards, identity cards, stocks, bonds, certificates, vouchers, checks, tickets, credit cards, health cards) as well as product security elements such as labels, seals and Packagings.

• a) ein Substrat mit einer Oberseite, die einen strukturierten Abschnitt umfasst, bereitgestellt wird, und
• b) auf dem strukturierten Abschnitt eine Farbschicht mit mehreren ersten Pigmenten, die als Metallpigmente ausgebildet sind, gedruckt wird,

wobei sich die ersten Pigmente an der der Oberseite des Substrates zugewandten Unterseite der Farbschicht entlang des strukturierten Abschnitts anordnen,
wobei die im Schritt b) aufgedruckte Farbschicht neben den ersten Pigmenten zweite Pigmente, die als Magnetpigmente ausgebildet sind, aufweist, und wobei die Farbschicht während ihrer Fixierung mit einem Magnetfeld so beaufschlagt wird, dass die zweiten Pigmente an der der Oberseite des Substrates abgewandten Oberseite der Farbschicht in einem vorbestimmten Muster angeordnet werden.There is further provided a method for producing a security element for an article to be protected, such as a security paper, document of value or the like, in which

• a) a substrate having an upper surface, which comprises a structured portion is provided, and
• b) a colored layer having a plurality of first pigments, which are formed as metal pigments, is printed on the structured section,

wherein the first pigments are arranged on the lower side of the color layer facing the upper side of the substrate along the structured section,
wherein the ink layer printed in step b) has, in addition to the first pigments, second pigments which are in the form of magnetic pigments, and wherein the color layer is subjected to a magnetic field during its fixation such that the second pigments on the upper side of the upper side remote from the upper side of the substrate Color layer can be arranged in a predetermined pattern.

The fixation of the color layer can be effected in particular by drying the color layer. When using a UV varnish as a binder and a fixation by crosslinking of the paint by means of radiation is conceivable.

Thus, a security element according to the invention can be provided with the method according to the invention.

In addition to the provision of a further optical effect by the second pigments, the method according to the invention makes possible an exact registration of the pattern with the structured section provided with the first pigments. If the color layer is therefore printed with additional recesses or free areas in a window, for example, a hologram on the one side and on the other side in the exact same subject areas (including any recesses / free areas) a pattern generated by the second pigments or "Magnetic picture" perceptible.

The inventive method can be developed so that the developments of the security element according to the invention can be produced.

It is understood that the features mentioned above and those yet to be explained below can be used not only in the specified combinations but also in other combinations or alone, without departing from the scope of the present invention.

The invention will be explained in more detail by way of example with reference to the attached figures, which also disclose features essential to the invention. For better clarity, the drawings are at least partially dispensed with a representation true to scale and proportion. Show it:

1 a cross-sectional view of an embodiment of the security element according to the invention;

2 a top view on the top 14 of the security element 1 from 1 ;

3 a plan view of the substrate 2 of the security element 1 from 1 ;

4 to 6 Cross-sectional views for explaining a method for producing the security element according to the invention 1 ;

7 a plan view of another embodiment of the security element according to the invention 1 , and

8th a banknote 20 with a security element according to the invention 1 ,

At the in 1 embodiment shown comprises the security element according to the invention 1 a substrate 2 with a top 3 that have a structured section 4 includes, and a color coat 5 pointing to the structured section 4 is printed.

The substrate 2 has a carrier 6 which is formed here as a transparent plastic film (eg a PET film) and one on the carrier 6 applied lacquer layer 7 on. The carrier 6 opposite side of the paint layer 7 is not flat, but structured and thus modulated, as in the cross section in 1 is shown. You can also say that the top of the paint layer 7 has a relief structure. In the paint layer 7 can it be z. B. act to an embossed UV varnish. The relief structure may, for. A diffractive structure, such as a hologram, a holographic grating image, or a hologram-like diffraction structure.

On the top of the paint layer 7 and thus the top 3 of the substrate 2 is the color layer 5 imprinted, the first pigments 10 in the form of platelet-shaped metal pigments 10 and second pigments 11 in the form of magnetic pigments.

The first pigments 10 are along the structured section 4 the paint layer 7 arranged as schematically in 1 is shown, thereby forming a reflection or mirror layer 12 on the bottom 13 the color layer 5 , This arrangement of the first pigments 10 is a consequence of the production of the security element according to the invention 1 which will be described in detail below.

The second pigments 11 In the embodiment described here, they are at the substrate 2 opposite top 14 the color layer 5 aligned so that they look at the top 14 a (arched appearing) ring 15 (in 1 indicated by dashed lines). As the first and second pigments 10 . 11 in the same color layer 5 are contained, there is an optimal registration between the ring 15 and the mirror layer 12 in front.

In 2 is a plan view of the security element according to the invention 1 on top 14 shown. In a first subject area 8th is when looking at the top 14 the ring 15 recognizable.

In 3 is the top view on the opposite side to the top 14 and thus on the substrate 2 shown. Looking at this page, the hatched mirror layer is shown 12 recognizable in a second motif area 9 is arranged. The second subject area 9 lies exactly opposite the first motif area 8th , so that the described optimal registration exists. This registration is the result of the production of the security element according to the invention described in detail below 1 ,

For the production of the security element according to the invention, in a first step ( 4 ) the structured section 4 in the on the carrier 6 arranged paint layer 7 formed by a stamping process. In this case, the embossing process, if necessary, have a curing step. For example, a curing of the embossed structure 4 by means of UV radiation.

After that, a color layer 16 on the structured section 4 printed, the ink used for this purpose being a mixture of the first and second pigments 10 . 11 and at least one binder ( 5 ). The printing ink and in particular the dimensions of the first pigments 10 and / or the ratio of the first pigments 10 to the binder are / is chosen so that the first pigments 10 (at least a large proportion of the first pigments 10 ) after printing in the ink layer 16 directly on the structured section 4 attach or move towards it and move along the structured section 4 Align so that thereby the desired mirror layer 12 is formed. You can get the first pigments 10 Also referred to as "non-leafing" pigments.

The mirror layer thus formed 12 is almost indistinguishable from conventional metallization obtainable by vapor deposition.

During drying of the printed ink layer 16 becomes the color layer 16 exposed to a predetermined magnetic field, as by the magnetic field lines shown schematically 17 in 6 is indicated. The magnetic field lines 17 or the applied magnetic field is chosen so that the second pigments 11 (at least a large proportion of the second pigments 11 ) pattern in the desired manner, as in 6 is shown schematically. The second pigments 11 So you swim in the not yet dry layer of paint 16 and are aligned. These can be the second pigments 11 z. B. be formed as a "leafing" pigments, which (mainly) at the top of the color layer 16 be present and move due to the magnetic field, align and possibly collect or concentrate at certain points. The magnetic field is maintained until the color layer 16 dried, so then that in 1 shown security element 1 is made. The magnetic pigments 11 are thus aligned and / or arranged in registration with the embossed structured section provided with the platelet-shaped metal pigments.

Even if the surface of the paint layer in 1 is shown smooth, this can after the Drying depending on the choice of the strength of the applied magnetic field in particular be weak or strong three-dimensional, since the magnetic pigments to raise the binder to some extent.

According to a in 1 not shown variant, the magnetic field may in particular be chosen so that the attraction is particularly strong at one or more points, so that the magnetic pigments 11 Not only align themselves there, but also concentrate at these points and thus create a strong three-dimensional trained surface.

When the first pigments 10 For example, are formed as a platelet-shaped aluminum pigments, the mirror layer thus formed acts 12 considering the security element 1 through the transparent substrate 2 and thus along the arrow P1 in FIG 1 indicated viewing direction as a "silver" mirror layer 12 , When looking at the mirror layer 12 through the top 14 and thus along the direction according to arrow P2 in 1 would the mirror layer 12 however, they appear less metallic and less brilliant. However, since the second pigments 11 at the top 14 are arranged or aligned accordingly, when viewing along the direction of the arrow P2 another image impression is provided (here the ring 15 ) than when considering the security element 1 along the arrow direction P1. It can thus be a more attractive security element 1 be provided compared to the case where the ring 15 from the second pigments 11 not formed.

In addition, there is an optimal registration of the second pigments 11 to the structured portion provided with the first pigments 4 ago, which only because of the described manufacturing process and the user of the ink with the first pigments 10 and the second pigments 11 is possible. This also increases the security against counterfeiting, since such a security element 1 for example, can not be produced by two consecutive printing processes in the quality available here. There will always be a worse registration.

The ink for the color layer 16 can z. B. based on the metal pigment compositions, as described in the WO 2005/051675 A2 (See, for example, the description on page 11, line 10 to page 13, third paragraph) are described. The first pigments are based on a metal, which is preferably selected from the group consisting of aluminum, stainless steel, nichrome, gold, silver, platinum and copper. The metal is particularly preferably aluminum. The average particle diameter is preferably in a range of 2 μm to 50 μm, more preferably in a range of 5 μm to 15 μm, measured by a Coulter LS130 laser diffraction granulometer.

The first pigments 10 for the color layer 16 can also on the pigments of the metal pigment compositions according to the WO 2013/186167 A2 based.

Furthermore, the first pigments 10 for the color layer 16 on the pigments in the WO 2011/064162 A2 described effect pigment compositions that lead to metallic layers with color shift effect, based.

The second pigments, which are formed as magnetic pigments, may for example be formed as in the EP 2 792 500 A1 or in the US 7,517,578 B2 is described. In particular, the magnetic pigments can be formed as ferromagnetic pigments.

In 7 is a plan view of another embodiment of the security element according to the invention 1 shown. In this embodiment, the second pigments are 11 arranged or aligned so that a star 15 looking at the top 14 is perceptible, as shown schematically.

In 8th is a banknote 20 shown in the inventive security element 1 is integrated so that it can be used as intended. For example, the security element spans 1 a recess in the banknote 20 , Alternatively, the banknote 20 be transparent or partially transparent at least in this area, so that the security element 1 from both sides of the banknote 20 can be considered.

Alternatively or additionally, the security element 1 as a security thread 21 be formed, for example, in the form of a pendulum security thread in the banknote 20 is integrated.

LIST OF REFERENCE NUMBERS

1

security element

2

substratum

3

Top (of the substrate)

4

structured section

5

coat of paint

6

carrier

7

paint layer

8th

1st motif area

9

2nd motif area

10

1. pigment

11

2. Pigment

12

mirror layer

13

Underside (the color layer)

14

Top (the color layer)

15

template

16

coat of paint

17

magnetic field lines

20

bill

21

security thread

P1

arrow

P2

arrow

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• WO 2005/051675 A2 [0013, 0013, 0046]
• WO 2013/186167 A2 [0014, 0047]
• WO 2011/064162 A2 [0014, 0048]
• EP 2792500 A1 [0016, 0049]
• US Pat. No. 7,517,578 B2 [0016, 0049]

Claims (11)

Security element for an object to be protected, such. A security paper, document of value or the like comprising a substrate having a top surface comprising a patterned portion and a colorant layer printed on the patterned portion having a plurality of first pigments formed as metal pigments, the first pigments being attached to the one Upper side of the substrate facing the underside of the ink layer along the structured portion are arranged, characterized in that the printed ink layer next to the first pigments second pigments, which are formed as magnetic pigments, wherein the second pigments on the upper side of the substrate facing away from the top of the ink layer are arranged in a predetermined pattern. A security element according to claim 1, characterized in that the first pigments are arranged on the underside of the color layer so that they form a mirror layer. A security element according to claim 1 or 2, characterized in that the predetermined pattern is in registration with the structured portion. Security element according to one of the above claims, characterized in that the first pigments are not ferromagnetic. Security element according to one of the above claims, characterized in that the substrate has an embossing lacquer layer in which the structured section is embossed. The security element according to one of the above claims, characterized, in that the structured portion has a diffractive structure, in particular a hologram, a holographic grating image or hologram-like diffraction pattern, an achromatic structure, in particular a matte pattern, a micro-mirror array, a blazed grating having a saw-toothed groove profile, or Fresnel lens arrangement forms. Security element according to one of the above claims, characterized in that the substrate is formed as a transparent substrate. Security element according to one of the above claims, characterized in that the first pigments are formed as platelet-shaped metal pigments. Security element according to one of the above claims, characterized in that the first pigments are formed as platelet-shaped aluminum pigments. A method for producing a security element for an article to be protected, such as a security paper, document of value or the like, wherein a) a substrate having a top comprising a patterned portion is provided, and b) a color layer on the structured portion a plurality of first pigments which are formed as metal pigments, wherein the first pigments are arranged on the underside of the color layer facing the top of the substrate along the structured section, characterized in that the color layer printed in step b) is second in addition to the first pigments Pigments which are formed as magnetic pigments, wherein the color layer is so applied during its fixation with a magnetic field that the second pigments are arranged on the upper side of the substrate facing away from the top of the color layer in a predetermined pattern. A method according to claim 10, characterized in that the fixation of the color layer is effected by drying the color layer.

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