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a technology of optical security element and optical shielding, applied in the field of optical shielding element, can solve the problems of low luminescence obtained under given excitation conditions, high cost of production of core/shell structure, etc., and achieve the effects of increasing the diversity of selection, increasing the security against counterfeiting, and low cos
Inactive Publication Date: 2014-10-02
BUNDESDRUCKEREI GMBH
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[0006]The invention is therefore based on the technical object of specifying a security element, which can be produced at relatively low cost and satisfies all requirements in view of the observable and / or measurable luminescence under excitation conditions and may also have other advantages, in particular have an increased diversity in the selection of radiation-emitting substances (UV, VIS, IR) and / or an increased security against counterfeiting.
Problems solved by technology
A disadvantage of the security elements known so far is the relatively low luminescence obtained under given excitation conditions and the high cost of production of core / shell structures.
Method used
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example 1
Preparation of Usable Polycarbonate Derivatives
example 1.1
Preparation of a First Polycarbonate Derivative
[0092]183.3 g (0.80 mol) of bisphenol A (2,2-bis-(4-hydroxyphenyl) propane, 61.1 g (0.20 mol) of 1,1-bis-(4-hydroxyphenyl)-3,3,5-trimethyl cyclohexane, 336.6 g (6 moles of KOH and 2,700 g of water were dissolved in an inert atmosphere with stirring). Then a solution of 1.88 g of phenol in 2,500 ml of methylene chloride was added. Into the well-stirred solution, 198 g (2 mol) phosgene were introduced at pH 13 to 14 and 21 to 25° C. Then 1 ml of ethyl piperidine was added and stirred for another 45 min. The bisphenolate-free aqueous phase was separated, and the organic phase was washed, after acidification with phosphoric acid, with water until neutral and freed from solvent.
[0093]The polycarbonate derivative exhibited a relative solution viscosity of 1.255.
example 1.2
Preparation of a Second Polycarbonate Derivative
[0094]Analogously to Example 1.1, a mixture of 127.1 g (0.56 mol) of bisphenol A and 137.7 g (0.44 mol) of 1,1-bis-(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane was reacted to polycarbonate.
[0095]The polycarbonate derivative exhibited a relative solution viscosity of 1.263.
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Abstract
The invention relates to a security element for a security and / or valuable document, comprising a matrix based on an organic polymeric material, at least one electrically conductive pigment dispersed in the matrix, and at least one organic luminescent substance dispersed in the matrix, which luminescent substance is capable, in the presence of the conductive pigment, of non-contact excitation of light emission, and the particle size of which is less than 200 nm, wherein the luminescent substance is not encapsulated, and is directly surrounded by the matrix and is embedded therein, and to uses of such a security and / or valuable document and to security and / or valuable documents produced by such uses.
Description
FIELD OF THE INVENTION[0001]The invention relates to a security element, particularly for a security and / or valuable document, comprising a matrix based on an organic polymeric material, at least one electrically conductive pigment dispersed in the matrix, and at least one luminescent substance dispersed in the matrix, which luminescent substance is capable, in the presence of the conductive pigment, of non-contact excitation of light emission, and a printable composition for the preparation of such a security element, a security and / or valuable document having such a security element, as well as methods for the preparation and verification of such a security and / or valuable document.BACKGROUND OF THE INVENTION AND PRIOR ART[0002]Safety and / or security documents, identity cards, passports, ID cards, access control cards, visas, control characters, tickets, driver's licenses, motor vehicle documents, bank notes, checks, postage stamps, credit cards, any smart cards and adhesive label...
Claims
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Application Information
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Patent Type & Authority Applications(United States)
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