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Reversible piezochromic systems

A piezochromic, systematic technology, applied in the direction of organic chemistry, ink, household appliances, etc., can solve the problem of expensive, achieve the effect of preventing counterfeiting, short color reversal time, and cheap preparation

Inactive Publication Date: 2007-03-28
SUN CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, such systems generally require expensive multi-step processes for the synthesis of chemicals
For these reasons, previously known piezochromic systems are not suitable for use in printing ink formulations

Method used

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  • Reversible piezochromic systems

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Experimental program
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Effect test

Embodiment 1

[0037] The reversible piezochromic system of the present invention is obtained by adding 3-(2,2-bis(1-ethyl-2-methylindol-3-yl)vinyl)-3-(4- Diethylaminophenyl)-2-benzo[c]furanone (GN-169 from Yamamoto Chemical) (20 parts) was prepared by adding undecanoic acid (80 parts) so that both components were In powder state.

[0038] The mixture was spread between two glass plates and the mixture appeared white. When a little shear is applied between the two plates, a blue color appears and once the shear is removed, the blue color disappears and the mixture is colorless again. Therefore, this effect is reversible.

Embodiment 2

[0040] The reversible piezochromic system of the present invention is directly formulated in the ink system by adding 3-(2,2-bis(1-ethyl-2-methylindol-3-yl) Vinyl)-3-(4-diethylaminophenyl)-2-benzo[c]furanone (GN-169 from Yamamoto Chemical; 43 parts) was added to undecanoic acid (101 parts) from Cray Valley LTD's polyurethane alkyd resin (E20175: 144 parts) and desiccant Ca 41 DBP (8.7 parts) from Borchers. The resulting ink was printed on a sheet of paper using a 90 mesh screen. The color of the dry blot is light blue. Once the friction force was applied to the printed sample, a dark blue color appeared, and the blue color disappeared after the friction force was removed. This effect is reversible.

Embodiment 3

[0042] The reversible piezochromic system of the present invention is also directly formulated in the ink system by adding 3-(2,2-bis(1-ethyl-2-methylindol-3-yl) Vinyl)-3-(4-diethylaminophenyl)-2-benzo[c]furanone (GN-169 from Yamamoto Chemical; 60.6 parts) was added to undecanoic acid (51.2 parts), from Cray Valley Polyurethane alkyd resin from LTD (E20175; 115 parts), natural calcium carbonate (Britomya M from Omya UK Ltd; 16.6 parts), cobalt desiccant blend (Sun Chemical Gibbon; parts) and zirconium HF grade (Ellis & Everard; 2 parts).

[0043] The resulting ink was printed on a sheet of paper using a 90 mesh screen. Dry blots are cream or very light brown in color. Once friction was applied to the printed sample, a blue color appeared, which then disappeared after removal of the friction. This effect is reversible.

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Abstract

The present invention provides a reversible piezochromic system that gives high contrast images upon an application of pressure to the system. The system has a short color-reversal time and can be prepared inexpensively by admixing a suitable electron donating compound and a suitable electron accepting compound. The reversible piezochromic systems of the present invention are useful for preparing a printing ink that can be used to print, for example, banknotes, to prevent forgeries.

Description

technical field [0001] The present invention relates to reversible piezochromic systems suitable for the preparation of printing inks. The reversible piezochromic systems of the present invention provide printed images with high contrast and short color reversal times. Furthermore, the piezochromic systems of the invention are cheap to produce compared to existing systems and are useful, for example, for printing banknotes to prevent counterfeiting. Background technique [0002] Piezochromic substances change color when pressure is applied. Pilot studies have been carried out on systems using such substances, but these studies have resulted in very few commercial applications. [0003] The intrinsic color of piezochromic substances is due to the absorption of light in a specific region of the excitation spectrum, as a result of the transition of electrons from the ground state to a higher energy state. When pressure is applied to the substance, these energy states are dis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D11/02C07D405/14C07D491/04C07D493/10C09D11/00C09D11/10G03C1/685
CPCG03C1/685C07D491/04C07D405/14C07D493/10C09D11/101C09D11/50
Inventor 纳萨莉·勒鲁
Owner SUN CHEM CORP
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