Composition exhibiting reversible color change and exterior parts for clock using same

A color-changing composition and watch technology, applied in the direction of nanotechnology for materials and surface science, color-changing fluorescent materials, time-indicating mechanical devices, etc., can solve the problem that photochromic molecules are not suitable for long-term storage and color change time is long , Incomplete reversibility of color change, etc.

Inactive Publication Date: 2004-07-28
SEIKO INSTR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the case of using such a photochromic molecule as a coloring material, the reversibility of the color change is not complete in many cases, and the time required for the color change is too long
Also, when the process of color change is repeated by absorbing light, deterioration of light such as loss of reversibility of color change occurs, and further, when exposed to heat or ultraviolet rays for a long time, reversibility of color change often disappears, and light Chromogenic molecules are also not suitable for long-term storage
As mentioned above, when the photochromic molecules of the prior art are used as exterior decorative parts of watches, it is sometimes difficult to guarantee their satisfactory quality.
Also, because this color change depends on the chemical structure, the color can only change between colorless and one color or between two colors

Method used

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  • Composition exhibiting reversible color change and exterior parts for clock using same
  • Composition exhibiting reversible color change and exterior parts for clock using same
  • Composition exhibiting reversible color change and exterior parts for clock using same

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0035] Thus, the present invention can be more fully elucidated by referring to the accompanying drawings. Figure 5 is a cross-sectional view showing a watch dial in one embodiment of the present invention. Such as Figure 5 As shown in , a base metal plating layer 2 is formed on a dial substrate 1 made of brass or nickel silver. The finishing layer 3 is then formed by finishing plating or coating. Also, to improve the efficiency of color change, the white layer 4 may be partially used as a base pattern by screen printing, and the discoloration layer 5 may be formed on the upper surface of the white layer 4 by screen printing. Furthermore, a smaller form 6 is formed on the finishing layer 6 and a dial support 7 is formed on the lower surface of the dial substrate 1 .

[0036] In this case, the discoloration layer 5 can be formed as follows.

[0037] To 50 parts by weight of thermosetting transparent ink made of epioxymelamine as the main component, add 50 parts by weight ...

example 2

[0041] Then, with Nd 2 o 3 Fine particles illustrate an example of the present invention. To 50 parts by weight of thermosetting transparent ink made of epioxymelamine as the main component, add 50 parts of Nd with an average particle size of about 7 microns 2 o 3 Fine particles, then fully stirred, so that the Nd 2 o 3 Fine particles are well dispersed in transparent ink. In this case, an appropriate amount of a solvent made of ethylene glycol monobutyl ether as a main component may be added thereto to control the viscosity. Using the above ink, screen printing can be applied on the upper surface of the white layer 4 of the dial, and the printed layer is cured at 150° C. for 30 minutes, and then dried to form a color-changing layer 5 with a thickness of 70 microns.

[0042] The upper surface of the dial formed by the above construction method is illuminated by each of the three light sources, namely sunlight, standard light source D 65 For example, highly color reprodu...

example 3

[0044] Then, with Pr 2 o 3 Fine particles show an example of the present invention. In 50 parts by weight of thermosetting transparent ink made of epioxymelamine as the main component, add 50 parts by weight of Pr with an average particle size of about 10 microns 2 o 3 Fine particles, followed by thorough stirring, so that Pr 2 o 3 Fine particles are well dispersed in this transparent ink. In this case, an appropriate amount of a solvent made of ethylene glycol monobutyl ether as a main component may be added thereto to control the viscosity. With the inks described above, screen printing can be applied on the upper surface of the white layer 4 of the dial. The printed layer is melted and baked at 150° C. for 30 minutes for aging treatment, and then dried to form a color-changing layer 5 with a thickness of 70 microns.

[0045] The upper surface of the dial formed by the above construction method is illuminated with each of the three light sources, namely sunlight, stan...

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PUM

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Abstract

A reversibly discoloring ink composition which changes color reversibly and instantly in response to irradiation with light of a given wavelength distribution. The discoloring composition has fine particles comprised of one or more rare earth oxides represented by the general formula M2O3, wherein M is Ho, Nd, or Pr, and a light-transmissive base material having the fine particles dispersed therein. In an embodiment, a color changing decorative layer formed of the reversibly discoloring ink is printed on the upper layer of a dial plate or other wristwatch part.

Description

field of invention [0001] The present invention relates to a kind of reversible discoloration composition that can change color according to the kind of external light source, and this composition is used as the part of exterior decoration parts such as the dial of watch, strap, and the object color that has part can be reversible A feature that changes in real time according to the type of external light source. Background of the invention [0002] Hitherto, as a substance whose color of the compound causes reversible discoloration by irradiation with light, it is called a photochromic molecule. Upon absorption of energy by light exposure, photochromic molecules change their chemical structure and thus cause a change in the color of the compound. As such photochromic molecules, it is known that the object color of spiropyran changes from colorless to blue-purple or red-purple through dispersion, and the object color of thioindigo changes from purple to red through cis-tran...

Claims

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Application Information

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IPC IPC(8): G04B19/06B82Y30/00B82Y99/00C08K3/22C08L101/00C09D7/61C09D11/00C09K9/00G04B37/22
CPCC08K3/22G04B37/22C09K9/00C09D7/1216C09D7/1266C09D11/50C09D7/61C09D7/67
Inventor 野口光一田中隆义森田喜一郎池田泰久
Owner SEIKO INSTR INC
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