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Composite marking based on chiral liquid crystal precursors and modifying resins

A technology of chiral liquid crystal and modified resin, which is applied in the direction of copying/marking method, liquid crystal material, temperature recording method, etc., and can solve the problems of expensive, complicated implementation, and inability to modify the chiral liquid crystal polymer layer

Active Publication Date: 2016-08-24
SICPA HLDG SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is complex and expensive to implement for industrial processes that require high marking speeds on a large number of items
[0013] One of the disadvantages of the above method is the inability to modify the chiral liquid crystal polymer layer in a selective and controlled manner and make it difficult (if not impossible) to replicate and also compatible with production lines (processes for manufacturing passports, packaging, etc.) strong and reliable marking or code of

Method used

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  • Composite marking based on chiral liquid crystal precursors and modifying resins
  • Composite marking based on chiral liquid crystal precursors and modifying resins
  • Composite marking based on chiral liquid crystal precursors and modifying resins

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0170] Embodiment 1-Preparation of chiral liquid crystal precursor composition

[0171] The chiral liquid crystal precursor composition was prepared as follows, the indicated percentages are by weight based on the total weight of the composition:

[0172] The chiral dopant compound B (3%), nematic compound A (47%), cyclopentanone (47%) and salt KPF of the above shown formula (I) 6 (0.5%) was placed in a flask, after which it was heated until a solution was obtained. To this solution was added 2-methyl-1[4-(methylthio)phenyl]-2-morpholinopropan-1-one (Irgacure from Ciba photoinitiator, 1.5%) and surface additives (1%). The final mixture is stirred until complete dissolution is achieved to yield a chiral liquid crystal precursor composition.

[0173] Example 1 - Preparation of layer of cured chiral liquid crystal precursor composition

[0174] The above precursor composition of Example 1 was coated in some areas on a black paper substrate functionalized with a modified resi...

Embodiment 2

[0181] Embodiment 2-Preparation of chiral liquid crystal precursor composition

[0182] The chiral liquid crystal precursor composition was prepared as follows, the indicated percentages are by weight based on the total weight of the composition:

[0183] Chiral dopant compound B (7%), nematic compound A (43%) and cyclopentanone (47.5% ) was placed in a flask, after which it was heated until a solution was obtained. To this solution was added 2-methyl-1[4-(methylthio)phenyl]-2-morpholinopropan-1-one (Irgacure from Ciba photoinitiator, 1.5%) and surface additives (1%). The final mixture is stirred until complete dissolution is achieved to yield a chiral liquid crystal precursor composition.

[0184] Example 2 - Preparation of layer of cured chiral liquid crystal precursor composition

[0185] The above precursor composition of Example 2 was coated in some areas on a black paper substrate functionalized with a modified resin (UV curable varnish) made from the composition of...

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PUM

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Abstract

Disclosed is a substrate which has thereon a marking or layer comprising a cured chiral liquid crystal precursor composition which does not contain any salt that would change the position of a selective reflection band exhibited by the cured composition.A modifying resin made from one or more polymerizable monomers comprising an average of at least one ether functionali typer polymerizable group is disposed between the substrate and the marking or layer and in contact with the marking or layer in one or more areas thereof. The modifying resin changes the position of a selective reflection band exhibited by the cured chiral liquid crystal precursor composition on the substrate in the one or more areas.

Description

field of invention [0001] The present invention relates to composite markings based on chiral nematic (also known as cholesteric) liquid crystal precursors, in particular wherein the modified resin alters the selective reflection exhibited by the cured chiral liquid crystal precursor composition in the chiral liquid crystal state The location of the tape is marked. The present invention also relates to methods of providing composite labels to substrates and methods of altering the selective reflection bands exhibited by cured chiral liquid crystal precursor compositions on substrates. Background technique [0002] Counterfeiting is no longer a national or regional problem, but a global problem that affects not only manufacturers, but consumers as well. Counterfeiting is a significant problem for goods such as clothing watches, but becomes even more serious when it affects pharmaceuticals and pharmaceuticals. Every year thousands of people die from counterfeit medicines all...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/02B41M3/14B41M5/28B42D15/00B42D25/00C09K19/38C09K19/58C09K19/04C09K19/34
CPCB41M3/14B41M5/281B42D25/364C09K19/02C09K19/38C09K19/3852C09K2019/0448C09K2019/3408C09K2219/03C09K19/3861C09K19/542
Inventor S·玛亚德T·若赞
Owner SICPA HLDG SA