Reversible information display medium of liquid crystal type and non-Contact IC card using same

A technology of information display and liquid crystal, applied in liquid crystal materials, static indicators, nonlinear optics, etc., can solve the problems of reducing contrast and contrast

Inactive Publication Date: 2002-08-07
TOKYO MAGNETIC PRINTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Therefore, it has not yet been used on rewritable paper or OHP display sheets, magnetic card display parts, and IC card display parts, does not reduce contrast under long-term o

Method used

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  • Reversible information display medium of liquid crystal type and non-Contact IC card using same
  • Reversible information display medium of liquid crystal type and non-Contact IC card using same
  • Reversible information display medium of liquid crystal type and non-Contact IC card using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0088] In 240 parts by weight of tetrahydrofuran (THF), 100 parts by weight of polymer liquid crystal LCP 105 manufactured by Merck Co., Ltd. and 3 parts by weight of dichroic dye NKX-1366 manufactured by Nippon Photochrome Co., Ltd. were mixed to prepare a liquid crystal recording layer coating liquid. On a polyethylene terephthalate (PET) film on which an Al layer was formed, this solution was applied with a bar coater so that the film thickness after drying was 5 mm. On this film, 50% by weight of a mixture of 100 parts by weight of UV-curable resin NK-OLIGO U-6HA manufactured by Shin-Nakamura Chemical Co. Ethanol solution to make a 2.5mm thick film after ultraviolet irradiation as a protective layer.

[0089]The above-mentioned information recording medium was heated to 130°C, and heat and an electric field were applied under the conditions of 50 Hz and 100 V using the electric field application plate shown in Fig. 6, and the display part became colorless. The reflection ...

Embodiment 2

[0090] In 240 parts by weight of tetrahydrofuran (THF), 100 parts by weight of polymer liquid crystal LCP 105 manufactured by Merck Co., Ltd. and 3 parts by weight of dichroic dye NKX-1366 manufactured by Nippon Photochrome Co., Ltd. were mixed. 10, 20, 30, and 40% by weight of low-molecular liquid crystal ZLI-4792 manufactured by Merck Corporation were added to prepare four types of liquid crystal recording layer coating liquids. These coating liquids were coated with a bar coater on a polyethylene terephthalate (PET) film on which an Al layer was formed so that the film thickness after drying was 5 mm. ULS-1935LH was coated on this film with a bar coater, and after drying, it became a film of 1.5 mm. On this film, 50% by weight of a mixture of 100 parts by weight of UV-curable resin NK-OLIGO U-6HA manufactured by Shin-Nakamura Chemical Co. Ethanol solution, UV irradiation to form a 2.5mm thick film as a protective layer.

[0091] When the information recording medium prepa...

Embodiment 3

[0092] In 240 parts by weight of tetrahydrofuran (THF), 100 parts by weight of high-molecular liquid crystal LCP 105 manufactured by Merck, 25 parts by weight of low-molecular liquid crystal ZLI-4792 manufactured by Merck, and 3 parts by weight of dichroic dye manufactured by Nippon Photochrome Co., Ltd. were mixed. In the coating liquid of NKX-1366, add the UV-curable resin NK ester A-TMM-3 of Shin-Nakamura Chemical Co., Ltd. and the initiator i.e. イルガキユア 907 (mixing ratio, resin / initiator=95 weight) manufactured by Ciba-Geigy Co. parts / 5 parts by weight), so that relative to the sum of high-molecular liquid crystals and low-molecular liquid crystals, they were 10, 20, 30, 40, and 50%, respectively, and five liquid crystal recording layer coating liquids were prepared. These coating liquids were coated on a polyethylene terephthalate (PET) film having an Al layer thereon with a bar coater, dried, and irradiated with ultraviolet rays to form a film with a thickness of 5 mm. UL...

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Abstract

A reversible information display medium of liquid crystal type, characterized in that it has a recording layer comprising a liquid crystalline composition exhibiting a glass state at room temperature and a dichroic dye as main components, wherein the liquid crystalline composition exhibits an isotropic liquid state or a liquid crystal domain state by the application of heat and further exhibits a homeotropic orientation state by the application of both heat and electric field; and a noncontact IC card utilizing such a reversible information display medium of liquid crystal type.

Description

technical field [0001] The present invention relates to an information display medium, and more specifically, to a reversible information display medium used, for example, as rewritable paper or a display sheet for OHP, a display portion of a magnetic card, or a display portion of an IC card. Background technique [0002] In recent years, extensive use of paper and plastics for displaying recorded information has become a matter of concern from the viewpoint of resource issues and environmental issues. In addition, the information recording card is required to be used in a variety of ways and to have a display capability. Since the display area of ​​the display portion of a card or the like is limited, it is desirable to be able to repeatedly write and erase, that is, erase unnecessary information and rewrite necessary information. In addition, a secure display medium is required so that the displayed information cannot be easily rewritten. [0003] As a heat-sensitive dis...

Claims

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Application Information

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IPC IPC(8): C09K19/12C09K19/18C09K19/20C09K19/30C09K19/34C09K19/38C09K19/60G02F1/133G02F1/1333G02F1/1337G02F1/139G06K19/06
CPCC09K19/2007C09K19/3852C09K19/18G06K19/06046G06K19/07703C09K19/3003C09K19/3458C09K19/20C09K19/12C09K19/60C09K19/3066C09K19/3402G02F2001/133742C09K19/3068G02F1/132G02F1/133365C09K2019/0448C09K2019/3422G02F1/13725C09K2323/00G02F1/133742G06K19/02
Inventor 真田聪波多野真之
Owner TOKYO MAGNETIC PRINTING
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