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Transparent laser marking sheet, laminate and laser marking method

A laser marking and transparent technology, which is applied in chemical instruments and methods, copying/marking methods, coatings, etc., can solve problems such as the decline in the reliability of identity certificates and obstacles to the movement of talents, achieving excellent transparency, high versatility, high contrast effect

Active Publication Date: 2019-06-07
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, as long as a third party other than the state (or state agency) can easily falsify or forge personal information, the reliability of identification will decrease
Then, it is likely to hinder the development of international exchanges and the movement of human resources around the world

Method used

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  • Transparent laser marking sheet, laminate and laser marking method
  • Transparent laser marking sheet, laminate and laser marking method
  • Transparent laser marking sheet, laminate and laser marking method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0252] Hereinafter, although an Example demonstrates this invention more concretely, this invention is not limited to this. In addition, various evaluations and measurements in Examples and Comparative Examples were implemented by the following methods.

[0253] [1] Transparency of transparent laser marking sheet:

[0254] For the transparent laser marking sheets used in Examples 1 to 5 and Comparative Examples 1 to 6, the total light transmittance of the sheets was measured using a spectrophotometer (manufactured by Macbeth, trade name "EYE7000"). As evaluation, evaluation was performed based on the following criteria.

[0255] "Evaluation Criteria"

[0256] ⊚: The total light transmittance is 80% or more, and the total light transmittance is extremely good.

[0257] ◯: The total light transmittance is 60% or more and less than 80%, and the total light transmittance is good.

[0258] X: The total light transmittance is less than 60%, and the total light transmittance is p...

manufacture example 1

[0280] (Manufacturing Example 1) Substrate sheet A1 (single-layer sheet):

[0281] Use polycarbonate resin (manufactured by Idemitsu Kosan Co., Ltd., trade name "TARFLON FN2500A", melt volume ratio=8cm 3 / 10min) 100 parts by mass, 0.0015 parts by mass of carbon black (#10 manufactured by Mitsubishi Chemical Corporation, average particle diameter 75nm, DBP oil absorption 86ml / 100gr) as an energy absorber for absorbing laser light energy, and 0.0015 parts by mass as a phenolic antioxidant 0.1 parts by mass of n-octadecyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate (manufactured by Ciba Specialty Chemicals, trade name "IRGANOX 1076") as an oxidizing agent and as an ultraviolet absorber 0.2 parts by mass of 2-(2'-hydroxyl-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole (manufactured by Ciba Specialty Chemicals, trade name "Tinuvin 327"), passed A substrate sheet A1 (single-layer sheet) having a single-layer thickness of 100 μm was obtained by T-die extrusion.

manufacture example 2

[0282] (Manufacturing Example 2) Substrate sheet A2 (multilayer sheet):

[0283] In non-crystalline polyester resin (manufactured by Eastman Chemical Co., trade name "Easter GN071", EG / CHDM (ethylene glycol unit / 1,4-cyclohexanedimethanol unit, the same below) = 70 / 30 mol 0.1 part by mass of calcium stearate as a lubricant was blended into 100 parts by mass of %) as a surface layer. Use polycarbonate resin (manufactured by Idemitsu Kosan Co., Ltd., trade name "TARFLONFN2500A", melt volume ratio=8cm 3 / 10min) 100 parts by mass, 0.0015 parts by mass of carbon black (#10 manufactured by Mitsubishi Chemical Corporation, average particle diameter 75nm, DBP oil absorption 86ml / 100gr) as an energy absorber for absorbing laser light energy, and 0.0015 parts by mass as a phenolic antioxidant 0.1 parts by mass of (n-octadecyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate (“IRGANOX1076” manufactured by Ciba Specialty Chemicals) as an oxidizing agent and 2 parts by mass as an ultraviol...

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Abstract

Provided is a transparent laser-marking sheet that has favorable bonding effect to a sheet making up an electronic passport, a plastic card or the like, is versatile, and enables laser marking of clear letters, figures, symbols or information with high contrast. A transparent laser-marking sheet includes: a base-material sheet 2 that is configured as a single-layer sheet made of a transparent polycarbonate resin composition including laser-light energy absorbing agent, or a base-material sheet that is configured as a multilayer sheet having skin layers and a core layer, the skin layers being made of thermoplastic resin and the core layer being made of a transparent polycarbonate resin composition including laser-light energy absorbing agent, and an adhesive layer 3 on at least one of faces of a base-material sheet, the adhesive layer being made of transparent thermal activation adhesive including polyester resin.

Description

technical field [0001] The present invention relates to a transparent laser marking sheet, a laminate and a laser marking method. Background technique [0002] Recently, with the development of international exchanges and the active flow of human resources, ID cards that record personal information, or so-called identity certificates (certificates of birth) such as passports, etc., can be used to identify individuals and prove their identity and family background. The current situation is that the importance of identity certificates issued by public institutions and highly reliable organizations is increasing. [0003] In addition, after the terrorist incidents that occurred frequently around the world in September 2001, countries adopted measures such as strict control of entry and exit management. For example, ICAO (International Civil Aviation Organization), a specialized agency of the United Nations, has begun to formulate standards in various countries and introduce th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B41M5/26B32B9/00B32B27/36B42D25/24B42D25/41
CPCB32B7/12B32B27/08B32B27/365B32B2255/10B32B2255/26B32B2264/102B32B2264/107B32B2264/108B32B2307/412B32B2307/554B32B2307/75B32B2425/00B41M5/267B42D25/23B42D25/24B42D25/351B42D25/387B42D25/41B42D25/47B32B27/36C09J167/00
Inventor 阪上俊规桥本章渡边崇志
Owner MITSUBISHI CHEM CORP
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