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Erase color variable ink

A friction discoloration and ink technology, applied in ink, household appliances, applications, etc., can solve the problems of poor resistance, general resistance to circulation, instability, etc., to achieve excellent printability, improve anti-counterfeiting level, and improve the effect of anti-counterfeiting level.

Inactive Publication Date: 2005-01-26
CHINA BANKNOTE PRINTING & MINTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main types of wiping variable color inks are microcapsules, which are similar to the principle of carbonless copy paper. They are mutually reactive, mainly from colorless to colored, and have general flow resistance. Usually, coating is used, and there is a certain degree of difficulty in application. Single anti-counterfeiting function, easy to forge
Chinese patent application 1201213 discloses a wiping-variable color ink, which is an interactive reaction type. Its principle is that the CB color developer coating reacts with the CF color developer coating to develop color. The disadvantage is that it can only be colorless. Colored, poor resistance, extremely unstable
The patent application CN1176982 of Gold Anti-counterfeiting Technology Co., Ltd. of Nankai University discloses a molecular recognition type solid-phase anti-counterfeiting technology, which is also an interactive type, has poor tolerance, is unstable, and has a single function

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1, the preparation of wiping variable color offset printing ink:

[0021] Tribochromic material: 25%

[0022] Phenolic resin oil: 30%

[0023] Alkyd resin (oil degree 70): 22%

[0024] Calcium carbonate filler: 20%

[0025] Desiccant: 1%

[0026] High boiling point kerosene: 2%

[0027] After the above-mentioned substances are weighed in proportion, they are stirred in the mixing tank for 20-30 minutes, pre-dispersed, and then rolled on a three-roll ink padding machine to make it reach the technical index of offset printing ink application (ink fineness≤15 microns, The fluidity is 28--35mm), which is the finished product of rubbing variable color offset printing ink. Its imprint is black and green. Under a certain force, rubbing with white paper can turn red, and it is completely transparent in the near-infrared region.

Embodiment 2

[0028]Example 2, add 20% ZnS:Cu ultraviolet fluorescent pigment (under the excitation of 365nm ultraviolet light, emit visible green light) to the wiping variable color offset printing ink prepared in Example 1, according to the known ink processing method, It can be made into printing ink. In addition to the anti-counterfeiting features of frictional discoloration and full transmission in the near-infrared region, it also has the anti-counterfeiting function of ultraviolet fluorescence.

Embodiment 3

[0029] Embodiment 3, in the wiping variable color offset printing ink prepared in embodiment 1, add 20% Y 2 O 2 S: Eu ultraviolet fluorescent pigment (under the excitation of 365nm ultraviolet light, emits visible red light) can be made into printing ink according to the known ink processing method. Anti-counterfeit function with UV fluorescent feature.

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Abstract

A rubbing-allochroic ink is a black ink containing a rubbing-allochroic component, and features that when it is rubbed by a white paper, its color can change from black to red. It can be used for antiforge purpose.

Description

technical field [0001] The invention relates to an anti-counterfeit ink, in particular to a wiping-variable color ink whose imprint changes color when rubbed with a certain force. Background technique [0002] Anti-counterfeiting inks are mostly used for the printing of checks, banknotes and other valuable securities and trademark cards to prevent alteration and forgery. At present, there are many types of anti-counterfeiting inks, such as magnetic inks, fluorescent inks, anti-alteration inks, temperature-changing inks, OVI inks, and wiping variable-color inks. The principle of wiping variable-color ink is to add special friction-changing materials or microcapsules containing discoloring substances to the ink. When rubbing or pressing with certain tools (such as white paper, cardboard, coins or nails, etc.), the ink will The printed imprint changes color to identify authenticity. As a public anti-counterfeiting feature, the rub-changeable color ink can be used for securiti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D11/50
Inventor 刘卫东张莉邓德斌史力张虹刘东
Owner CHINA BANKNOTE PRINTING & MINTING
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