EA027391B1 - Method of manufacture of an optical polarized security element and structure of the element manufactured by this method - Google Patents

Method of manufacture of an optical polarized security element and structure of the element manufactured by this method Download PDF

Info

Publication number
EA027391B1
EA027391B1 EA201500070A EA201500070A EA027391B1 EA 027391 B1 EA027391 B1 EA 027391B1 EA 201500070 A EA201500070 A EA 201500070A EA 201500070 A EA201500070 A EA 201500070A EA 027391 B1 EA027391 B1 EA 027391B1
Authority
EA
Eurasian Patent Office
Prior art keywords
layer
substrate
protective layer
technological
surface
Prior art date
Application number
EA201500070A
Other languages
Russian (ru)
Other versions
EA201500070A1 (en
Inventor
Александр Георгиевич Бобореко
Александр Яковлевич Гореленко
Владимир Владимирович Еверкин
Михаил Петрович Захарич
Сергей Владимирович Кислухин
Михаил Николаевич Лущиков
Петр Васильевич Моисеенко
Леонид Викторович Танин
Сергей Петрович Плиска
Александр Васильевич Рак
Original Assignee
Закрытое Акционерное Общество "Голографическая Индустрия"
Республиканское Научно-Техническое Унитарное Предприятие "Криптотех" Департамента Государственных Знаков Министерства Финансов Республики Беларусь
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 Закрытое Акционерное Общество "Голографическая Индустрия", Республиканское Научно-Техническое Унитарное Предприятие "Криптотех" Департамента Государственных Знаков Министерства Финансов Республики Беларусь filed Critical Закрытое Акционерное Общество "Голографическая Индустрия"
Priority to EA201500070A priority Critical patent/EA027391B1/en
Publication of EA201500070A1 publication Critical patent/EA201500070A1/en
Publication of EA027391B1 publication Critical patent/EA027391B1/en

Links

Abstract

The method for manufacturing an optical security element and a security element produced by this method as claimed in the invention relate to the field of protecting securities and documents from counterfeiting, as well as to the field of authenticating them. In the inventive method, the first reflective layer is applied to at least one area of the substrate; then an additional technological substrate is introduced and a layer of the polymer composition is applied on one of the surfaces of the technological substrate. After that, structuring of at least one area of the protective layer deposited on the surface of the technological substrate is carried out, and then at least one latent image on this surface is formed with the polymer composition. After that, an optically transparent adhesive composition is applied on the reflective and / or protective layer with latent images to connect these layers together, after which the technological substrate is removed from the surface of the protective layer. In addition, in the method, polymers from the polycarbonate, polystyrene, fluorlac series are used as the polymer composition; the reflective layer is represented as a metal layer, or as a coating of metal particles, or as a gilding foil, or as a hologram. At the same time, it is positioned in such a way that its metal-containing surface is located in contact with the adhesive composition. In this case, the protective layer placed on the technological substrate is structured mechanically; a substrate made of polyethylene terephthalate or polypropylene is used as a technological substrate, and acrylates are used as an optically transparent adhesive composition. The inventive protective element is made according to the claimed method. It contains a substrate on which a reflective layer is placed and a layer of a polymeric composition combined with a reflective layer, which serves as a protective layer. On the structured surface of the latter, protrusions with hidden images are placed, and the reflective layer and the structured layer with hidden images are combined with each other using an optically transparent adhesive composition.

Description

The present invention relates to the field of protection of securities and documents from counterfeiting, as well as to the field of verification of their authenticity, in particular to the manufacture and production of optical security elements that carry a hidden image, invisible in natural light to the naked eye.

Currently, for protection against counterfeiting and as signs (marks) identifying the authenticity of documents, securities, etc., various means of printing protection are used watermarks, microtext, guilloche, etc., using magnetic, holographic, optical and other methods.

Among the protective elements with variable optical properties, the most difficult to reproduce are elements containing latent images visible only in polarized light.

As a rule, latent polarized images are obtained on the surface or in the volume of the polymer layer of the carrier of the latent image as a result of the formation of optical anisotropy in the local region of the aforementioned polymer layer, namely, a change in the magnitude of birefringence.

A local change in the magnitude of birefringence can be achieved either by changing the magnitude and / or direction of the optical anisotropy of the transparent material in certain parts of it, or by changing the thickness of the transparent anisotropic material in certain areas of the layer.

These effects are achieved by mechanical, or chemical, or photophysical, or thermomechanical effects. In all these cases, a latent polarized image is formed in a polymer layer previously prepared in a special way or on the surface of a solid substrate.

Known methods for manufacturing a latent image and a protective element based on it suggest the presence of a continuous, usually a polymer layer that carries a latent polarized image, glue is applied to the back side, after which cutting is performed and the final product is obtained - self-adhesive labels and tags.

The labels and tags thus obtained are attached to the item to be protected either manually or using an automatic applicator.

Moreover, in both cases, a sufficiently high stiffness of the layer carrying the latent image is required, which determines the possibility of reuse of the element.

A known method of manufacturing a latent image using local mechanical removal of solid anisotropic polymer material from the surface of a rigid substrate [1]. However, the known method leads to the formation of a contrasting polarized image with a clearly visible image contour to the naked eye and does not guarantee protection against reuse.

The closest in technical essence to the claimed as an invention method for manufacturing an optical protective element is an optical polarizing protective element and a method for its manufacture [2].

The known method consists in applying a reflective layer to the substrate, imprinting the latent image, structuring the portion of the layer carrying the latent image to a predetermined depth with optical anisotropy in this structured portion of the layer, which determines the invisibility of the image when observed with the naked eye and its clear contrast visibility when viewed in polarized light. After that, a thin transparent protective layer is applied over the entire surface of the protective element. In this case, the refractive index of the protective layer essentially coincides with the refractive index of the portion of the layer carrying the latent image.

However, the known method has significant disadvantages, namely:

not only the applied characters are subject to structuring, but also the substrate itself with a reflective layer, which negatively affects the quality of the image visualized using the polaroid;

when a transparent protective layer with a refractive index equal to the refractive index of the material of the symbols is applied to the structured symbols, their invisibility in unpolarized light is not guaranteed, i.e. this does not allow to completely get rid of the diffraction phenomena around the symbols.

The objective of the proposed invention as a method of manufacturing a protective agent is to eliminate all of the above disadvantages.

The problem is solved in that the inventive method of manufacturing an optical protective element includes applying a reflective layer to at least one portion of the substrate; the introduction of an additional technological substrate intended for applying a layer of a polymer composition that performs the function of a protective layer; applying a layer of a polymer composition that acts as a protective layer in the manufactured protective element, on one of the surfaces of the technological substrate; structuring at least one portion of the protective layer deposited on the surface of the technological substrate to provide optical anisotropy of the specified section; and also applying the composition to the structured surface of the protective layer to form at least one protrusion on which symbols forming a latent image are printed; the application of an optically transparent adhesive composition to a reflective and / or protective layer with latent images located on its surface with the subsequent connection of these layers with each other; removal of the technological substrate from the surface of the protective layer.

In addition, in the proposed method, as a polymer composition intended to form at least one latent image, as well as a polymer composition that acts as a protective layer and intended for application to a technological substrate, polymers from the series polycarbonate, polystyrene, fluoride are used, the reflective layer is a metal layer, a coating of metal particles, a gold-plated foil or a hologram, and a protective layer placed on a technological substrate, structure mechanized.

Moreover, as a technological substrate, a substrate made of polyethylene terephthalate or polypropylene is used, and acrylates are used as an optically transparent adhesive composition, while the reflective layer is arranged so that its metal-containing surface is in contact with the adhesive composition.

In a protective element made according to the method according to claims 1 to 8 and containing a substrate, at least in one portion of which a reflective layer, an optically transparent adhesive layer and a protective layer of a polymer composition are sequentially arranged, on the side of the protective layer oriented to the adhesive, at least one structured anisotropic portion and at least one optically isotropic portion containing at least one protrusion on which symbols forming a latent image are printed.

The inventive method for manufacturing an optical security element is as follows.

First, a base substrate made of optically transparent material is treated. To do this, a reflective layer made of metals or metal-containing particles is applied to the substrate, on its horizontally oriented surface. The thickness of this layer should not exceed 1 μm, since metals for the optical range of electromagnetic radiation are impermeable and well reflect the waves of this range.

As a reflective layer, either a thin layer of a vacuum-deposited metal, such as aluminum, or metal-containing paint particles, or reflective layers of a gold-plated foil or hologram, etc. can be used.

After that, an additional technological substrate is introduced and processing is started, since it is present only at the stage of manufacturing the optical protective element.

At this stage, a polymer composition, for example polycarbonate from a solution, is applied to an additional so-called technological substrate made of any polymer, for example polyethylene terephthalate, on its lower horizontally oriented surface, and a polymer layer is formed, removing the solvent.

The polymer composition deposited on the technological substrate, in this case, not only performs the function of a protective layer for isotropic and anisotropic sections in the manufactured protective element, but also serves to create these sections.

After applying a protective layer to the technological substrate, this layer is subjected to structuring, which creates an anisotropic area. As a rule, such structuring is carried out mechanically, for example, by felt treatment.

Then, with a polymer composition of the same composition as the protective layer, protrusions are formed on the structured surface of the protective layer with the same solvent, printing symbols (letters, numbers, words, etc.) on them, forming a latent image, for example, by flexographic printing .

In this case, the polymer composition of the characters together with the solvent, falling on the structured sites, removes the structuring of the solvent before it is removed, i.e. under the symbols, isotropy is restored.

Thus, optically anisotropic regions are obtained, along with optically isotropic regions located at symbol sites.

At the end of the preparation of the technological substrate, an optically transparent adhesive composition is applied to the structured protective layer attached to it and to the protrusions formed on it, including isotropic sections, using adhesive with residual stickiness, for example, RADUGA 32 brand.

After that, the technological substrate is pressed tightly against the metallized surface of the reflective layer of the main substrate.

When connecting the technological and main substrates by means of an optically transparent adhesive, the latter not only glues two substrates with the elements deposited on them, forming an optically protective element of a special design, but also masks the structured sections of the protective layer and the symbols placed on the protrusions of this layer.

The technological substrate is removed from the surface of the obtained protective element.

Thus, an optical protective element is obtained, the construction of which consists of a substrate made of optically transparent material, on the surface of which a metallized reflective layer is applied, connected with an optically transparent adhesive to the structured surface of the polymer composition acting as a protective layer, which formed symbols with isotropic sections below them.

The design of the protective element made in the above-described way allows us to solve the problem of increasing the contrast when visualizing a latent image using a polaroid, and also guarantees the invisibility of latent images in unpolarized light and completely eliminates diffraction phenomena that occur along the contour of latent images.

The solution of this problem is also the optical protective element itself, made according to the claimed invention as a method, which contains a substrate, at least in one section of which a reflective layer, an optically transparent adhesive layer and a protective layer of a polymer composition are sequentially placed on the side of the protective layer, oriented to the adhesive, made at least one structured anisotropic section and at least one optically isotropic section containing at least one protrusion on which the symbols forming the latent image are printed.

The inventive optical security element is shown in FIG. 1 and 2.

In FIG. 1 shows an intermediate construction of a protective element manufactured by the claimed method according to claims 1 to 8 of the claims, comprising a technological substrate;

in FIG. 2 is a finished construction of a security element made by the aforementioned method.

The intermediate construction of the security element of the invention as shown in FIG. 1 includes a substrate 1 with a reflective layer 2, a technological substrate 3 with a layer 4 of a polymer composition comprising structured (anisotropic) sections 5, protrusions 6 (symbols) formed on a layer 4 with isotropic sections, and an optically transparent adhesive 7 for bonding together the mentioned layers, which are placed on the substrates 1 and 3.

The finished construction of the optical security element shown in FIG. 2 includes the same structural elements as the structure shown in FIG. 1 (except for pos. 3 - technological substrate), which is removed at the last stage.

Claimed as an invention, an optical security element operates as follows.

In its finished form, the protective element contains a substrate 1, on which a reflective layer 2 and a layer 4 of the polymer composition are placed, which acts as a protective layer, on which structured sections 5 with protrusions 6 are placed and which are glued to the reflective layer 2 of the substrate 1 using an adhesive composition 7.

Without a polaroid in normal light, the characters placed on the protrusions 6 are not visible.

In the presence of a circular polaroid (not shown in the drawings), unpolarized light from the source passes through a circular polaroid and receives circular polarization.

In the structured sections 5 of layer 4, due to birefringence, the circular polarization changes to elliptical and the light reflected from the reflective layer 2 of the substrate 1 leaves the polaroid, while the structured sections 5 manifest themselves as bright places.

The protrusions 6, on which the symbols are placed, are optically isotropic, and the light remaining in circular polarization, when reflected from the reflecting layer 2, changes only the direction of rotation. A change in the direction of rotation leads to the fact that after passing through a quarter-wave plate of a circular polaroid, the linear polarization of light does not coincide with the transmission plane of the polaroid. Therefore, the areas in the locations of the characters are dark. Thus, a latent image is visualized.

Hidden images in the claimed design of an optical security element in polarized light are clearly visible, with a high degree of contrast and without any diffraction phenomena along the contour of these hidden images.

Moreover, the claimed design of the security element provides complete invisibility of latent images in unpolarized light, which guarantees a high degree of protection of valuable documents from any forgery.

Declared as inventions, technical solutions related to a method of manufacturing an optical protective element and to the design of an optical protective element made by the claimed method are technically feasible and have a high technical level.

Information sources.

1. US patent No. 5284364.

2. EA-patent No. 011838, IPC С09Р 3/02, СОВ 1/08 (prototype).

Claims (9)

  1. CLAIM
    1. A method of manufacturing an optical polarizing protective element, comprising
    - 3 027391 applying a reflective layer to at least one portion of the substrate;
    the introduction of an additional technological substrate intended for applying a layer of a polymer composition that performs the function of a protective layer;
    applying a layer of a polymer composition that acts as a protective layer in the manufactured protective element, on one of the surfaces of the technological substrate;
    structuring at least one portion of the protective layer deposited on the surface of the technological substrate to provide optical anisotropy of the specified section;
    applying the polymer composition to the structured surface of the protective layer to form at least one protrusion on which the symbols forming the latent image are printed;
    applying an optically transparent adhesive composition to the reflective and / or protective layer with latent images located on its surface with the subsequent connection of these layers with each other;
    removal of the technological substrate from the surface of the protective layer.
  2. 2. The method according to claim 1, in which polymers from the series polycarbonate, polystyrene, and fluoride are used as the polymer composition for forming at least one latent image.
  3. 3. The method according to claim 1, in which polymers from the range of polycarbonate, polystyrene, and fluoride are used as a polymer composition that acts as a protective layer and is intended to be applied to a technological substrate.
  4. 4. The method according to claim 1, in which the reflective layer is a metal layer, a coating of metal particles, gold-plated foil or a hologram.
  5. 5. The method according to claims 1, 3, in which the protective layer placed on the technological substrate is structured mechanically.
  6. 6. The method according to claim 1, in which as the technological substrate use a substrate made of polyethylene terephthalate or polypropylene.
  7. 7. The method according to claim 1, in which acrylates are used as the optically transparent adhesive composition.
  8. 8. The method according to claim 1, in which the reflective layer is positioned so that its metal-containing surface is in contact with the adhesive composition.
  9. 9. The protective element made according to the method according to claims 1 to 8, comprising a substrate, at least in one portion of which a reflective layer, an optically transparent adhesive layer and a protective layer of a polymer composition are sequentially placed, while on the side of the protective layer oriented to adhesive, made at least one structured anisotropic section and at least one optically isotropic section containing at least one protrusion, which printed characters that form a latent image.
EA201500070A 2014-11-06 2014-11-06 Method of manufacture of an optical polarized security element and structure of the element manufactured by this method EA027391B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EA201500070A EA027391B1 (en) 2014-11-06 2014-11-06 Method of manufacture of an optical polarized security element and structure of the element manufactured by this method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EA201500070A EA027391B1 (en) 2014-11-06 2014-11-06 Method of manufacture of an optical polarized security element and structure of the element manufactured by this method

Publications (2)

Publication Number Publication Date
EA201500070A1 EA201500070A1 (en) 2016-05-31
EA027391B1 true EA027391B1 (en) 2017-07-31

Family

ID=56080139

Family Applications (1)

Application Number Title Priority Date Filing Date
EA201500070A EA027391B1 (en) 2014-11-06 2014-11-06 Method of manufacture of an optical polarized security element and structure of the element manufactured by this method

Country Status (1)

Country Link
EA (1) EA027391B1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20010012137A1 (en) * 1998-06-15 2001-08-09 Miklos Palmasi Tamper evident holographic devices and methods of manufacture
EA011838B1 (en) * 2008-04-30 2009-06-30 Открытое Акционерное Общество "Научно-Производственное Объединение "Криптен"" Optical polarized protection element and method for making thereof
US20130252008A1 (en) * 2010-12-07 2013-09-26 Hologram.Industries Secure product and method of producing said secure product
US20140177057A1 (en) * 2011-05-24 2014-06-26 Leonhard Kurz Stiftung & Co. Kg Film and Method for Producing Same

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20010012137A1 (en) * 1998-06-15 2001-08-09 Miklos Palmasi Tamper evident holographic devices and methods of manufacture
EA011838B1 (en) * 2008-04-30 2009-06-30 Открытое Акционерное Общество "Научно-Производственное Объединение "Криптен"" Optical polarized protection element and method for making thereof
US20130252008A1 (en) * 2010-12-07 2013-09-26 Hologram.Industries Secure product and method of producing said secure product
US20140177057A1 (en) * 2011-05-24 2014-06-26 Leonhard Kurz Stiftung & Co. Kg Film and Method for Producing Same

Also Published As

Publication number Publication date
EA201500070A1 (en) 2016-05-31

Similar Documents

Publication Publication Date Title
KR101153508B1 (en) Security document
CA2563529C (en) Film with polymer layer
RU2358317C2 (en) Optical protective element
CA2578377C (en) Metallised security element
TW533384B (en) Method of producing a security document or device
DK2117840T3 (en) Security element for a security document and method for producing it
US5815292A (en) Low cost diffraction images for high security application
US7820269B2 (en) Transfer film
EP1381520B1 (en) Birefringent marking
CN1151034C (en) Decorative foil
EP2996885B1 (en) Security documents and methods of manufacture thereof
EP2303594B1 (en) Security element
KR101121491B1 (en) Article comprising a moire pattern
US5411296A (en) Non-continuous holograms, methods of making them and articles incorporating them
US6124970A (en) Polymer materials with latent images visible in polarized light and methods for their production
RU2377133C2 (en) Material of foil and method of its production
CA2719566C (en) Security element and method for producing a security element
CN105228834B (en) Safety device and its manufacture method
CN100374885C (en) film und optical anti-counterfeiting element
RU2443004C2 (en) Optical security marking component, method of manufacturing such a component, system comprising such a component, and reader for checking such a component
EP1472100B1 (en) Secure data protection optically variable labels and foils
US5128779A (en) Non-continuous holograms, methods of making them and articles incorporating them
AU2016201176B2 (en) Forgery-proof medium and verification method
AU2007295876B2 (en) Radiation curable embossed ink security devices for security documents.
JP4257903B2 (en) Identification medium, identification medium identification method, identification target article, and identification apparatus

Legal Events

Date Code Title Description
MM4A Lapse of a eurasian patent due to non-payment of renewal fees within the time limit in the following designated state(s)

Designated state(s): AM AZ KG TJ TM