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Composition for Anti-counterfeit ink, Anti-counterfeit ink, printed article for counterfeit prevention, and method of producing composition for Anti-counterfeit ink

By adjusting the X-ray diffraction peak intensity and particle size of composite tungsten oxide ultrafine particles, combined with surface coating and volatile component control, the problem of insufficient near-infrared absorption and weather resistance of composite tungsten oxide ultrafine particles in the existing technology is solved, achieving Anti-counterfeiting ink with high contrast and light fastness, suitable for efficient manufacturing and authenticity determination.

Active Publication Date: 2018-11-09
SUMITOMO METAL MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when this sunlight shielding film is used for anti-counterfeit inks, the contrast of light absorption with respect to light transmission or emission is insufficient in the wavelength region that transmits or reflects light and the wavelength region that absorbs light when applied. , depending on the application, when used as an anti-counterfeiting ink, the reading accuracy, etc. may decrease

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0214] Dissolve 0.216kg of Cs in 0.330kg of water 2 CO 3 , which is added to 1.000kg of H 2 WO 4 After being fully stirred, it was dried to obtain the target Cs 0.33 WO 3 Mix powder.

[0215] Next, using the above figure 1 In the high-frequency plasma reaction apparatus described above, the vacuum in the reaction system is sucked to about 0.1 Pa (about 0.001 Torr) by a vacuum exhaust device, and then completely replaced with argon to create a flow system with a pressure of 1 atmosphere. Thereafter, argon gas was introduced at a flow rate of 30 L / min as a plasma gas in the reaction vessel, and argon gas was introduced at a flow rate of 55 L / min and helium gas at a flow rate of 5 L / min as a shielding gas from the shielding gas supply port in a spiral shape. Then, high-frequency electric power is applied to a water-cooled copper coil for generating high-frequency plasma to generate high-frequency plasma. At this time, thermal plasma having a high-temperature portion of 100...

Embodiment 2～6

[0231] Change carrier gas flow rate, plasma gas flow rate, shielding gas flow rate, raw material supply speed, except that, carry out the same operation as embodiment 1, manufacture the composite tungsten oxide ultrafine particle of embodiment 2~6, composite tungsten oxide Ultrafine particle dispersion, anti-counterfeiting ink and printing film. Table 1 shows the changed carrier gas flow rate conditions, raw material supply rate conditions, and other conditions. The same evaluation as in Example 1 was performed on the composite tungsten oxide ultrafine particles, the composite tungsten oxide ultrafine particle dispersion liquid, the anti-counterfeit ink, and the printed film of Examples 2 to 6. The evaluation results are shown in Table 2.

Embodiment 7

[0233] The Cs described in embodiment 1 2 CO 3 with H 2 WO 4 The mixed powder is changed to Cs which is fired at 800°C under the mixed gas atmosphere of nitrogen and hydrogen. 0.33 WO 3 The composite tungsten oxide shown was put into a high-frequency plasma reactor and used as a raw material. Other than that, according to the same method as in Example 1, the composite tungsten oxide ultrafine particles, composite tungsten oxide ultrafine particle dispersion, anti-counterfeiting ink and printing film of Example 7 were produced. The same evaluations as in Examples 1 to 6 were performed on the obtained ultrafine particles and their dispersion liquids, anti-counterfeiting inks, and printed films. The production conditions and evaluation results are shown in Table 1 and Table 2.

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Abstract

Provided are a composition for anti-counterfeit ink, said composition transmitting visible light and absorbing infrared light, thereby allowing the authenticity of a printed article to be judged. Alsoprovided are an anti-counterfeit ink and a printed article for counterfeit prevention. The present invention provides a composition for anti-counterfeit ink, said composition including ultrafine particles of a complex tungsten oxide, wherein, when the XRD peak intensity associated with a (220) surface of a silicon powder reference sample (640c, manufactured by NIST) is given a value of 1, the relative value of the XRD peak top intensity of the ultrafine particles of the complex tungsten oxide is 0.13 or greater. The present invention also provides an anti-counterfeit ink, a printed article for counterfeit prevention, and a method of producing the composition for anti-counterfeit ink.

Description

technical field [0001] The present invention relates to a composition for anti-counterfeiting ink, an anti-counterfeiting ink, a printed matter for anti-counterfeiting, and a method for producing a composition for anti-counterfeiting ink that absorb light in the near-infrared region. Background technique [0002] Usually, passbooks about deposits or valuable printed matter such as ID cards, credit cards, savings cards, checks, air tickets, road passes, train tickets, prepaid cards, commodity certificates, securities, etc., are used as anti-counterfeiting methods, and their substrates or printing methods are special treatment. [0003] For example, special printing that adds a watermark to a substrate (see Patent Document 1), printing of fine patterns (see Patent Document 2), digital processing using geometric printing represented by barcodes, and the like have been performed. However, the cost of special printing paper with a watermark is high, and barcode printing can be e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D11/50C01G41/00
CPCC01G41/00C09D11/50C01G41/006C01P2002/60C01P2002/72C01P2002/74C01P2006/12C01P2006/80C09D11/037C09D11/101
Owner SUMITOMO METAL MINING CO LTD
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