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Method for manufacturing secure element

A technology of security elements and supports, which is applied in the direction of information-carrying cards, printing of special varieties of printed matter, printing, etc., can solve the problems of increasing liquid crystal structure, cost, etc., to improve adhesion, avoid liquid crystal deposition, and diversify The effect of changing the color change effect

Active Publication Date: 2021-02-09
OBERTHUR FIDUCIAIRE SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The superposition of liquid crystals makes the structure expensive by increasing the amount of liquid crystals to be used

Method used

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  • Method for manufacturing secure element
  • Method for manufacturing secure element
  • Method for manufacturing secure element

Examples

Experimental program
Comparison scheme
Effect test

example 4

[0144] Example 4 (comparative) and Examples 5 to 7 (according to the invention)

[0145] Deposition of liquid crystal was performed as in Example 1 to Example 3 by means of a commercially available liquid crystal ink.

[0146]

[0147] *** Off-line: application after the step of stretching the PET film. In-line: The application is carried out between at least two steps of stretching the PET film during the manufacture of the film.

[0148] Examples 5 to 7 surprisingly retained the goniochromatic effect despite the presence of an intermediate primer layer between the bidirectionally oriented PET support and the liquid crystal layer allowing alignment.

[0149] Alignment of liquid crystals is modified due to the presence of an adhesive primer. This modification of the arrangement makes it possible to increase the visibility of the color changing effect and to give the liquid crystal layer a translucency, which makes it possible to limit the visibility of the black backgro...

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Abstract

The invention relates to a method for producing a security element comprising a support made from oriented plastic and at least one layer of liquid crystals borne and oriented by the support, an adhesion primer being deposited before or after the support is stretched in at least one direction, said stretching bringing the support to the oriented state and the liquid crystals being deposited by means of printing on the adhesion primer.

Description

technical field [0001] The invention relates to a security element for security documents, and to a method for producing said security element. [0002] More specifically, the invention relates to security elements carrying liquid crystals. Background technique [0003] Liquid crystals, especially cholesteric liquid crystals, are widely used in security elements due to their goniochromatic properties. To improve the visual effect of changing color with viewing angle, liquid crystals are usually placed in front of a dark (especially black) background. [0004] Furthermore, security elements in the form of strips (also known as security threads) are often incorporated into security documents such as banknotes. [0005] Typically, these security elements comprise a substrate made of a thermoplastic material such as polyethylene terephthalate (PET), which may be metallized and may have demetallized areas in the form of a pattern that appears in transmitted light . [0006] I...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B42D25/29B41M3/14B42D25/364B42D25/47
CPCB42D25/29B42D25/364B42D25/47B41M3/144
Inventor 皮埃尔·萨拉赞
Owner OBERTHUR FIDUCIAIRE SAS
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