JPH0536720Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a decorative body using a temperature-dependent photochromic composition.

Prior Art Conventionally, attempts have been made to apply organic photochromic compounds such as spiropyran, but they have not been put to practical use because of their significant deterioration due to light irradiation.

Furthermore, many coating compositions have been proposed for spirooxazine, which has excellent light resistance, but no photochromic materials having temperature dependence and their applications have been proposed.

Problems that the invention aims to solve Many coating materials using spirooxazine compounds with excellent light resistance have been proposed, but the photochromic function of articles coated with these coating materials does not develop color when exposed to ultraviolet rays or sunlight. However, it shows a simple color change in which the color is restored in a dark place.

The present invention seeks to provide a photochromic decoration that reversibly exhibits multiple color changes in response to the effects of both light irradiation and temperature changes.

Means for Solving the Problems The photochromic decoration of the present invention is an ink or paint containing a photochromic pigment that exhibits photochromic properties only at a predetermined temperature or below and does not exhibit photochromic properties above the above temperature. The coating layer is applied to the entire surface of the substrate or to a specific part of the substrate.

Substrates used in the present invention include those made of materials such as cloth, plastics, paper, glass, metal, and ceramics.

The photochromic pigment is obtained by microcapsulating a temperature-dependent photochromic composition, which is composed of a spirooxazine compound previously proposed by the applicant and an organic medium compound having a boiling point of 150° C. or higher, by a known method.

The spirooxysazine compound is 1,
3,3-trimethyl-spiroindolinenaphthoxazine, 1,3,3-trimethyl-5-chloro-spiroindolinenaphthoxazine and 1,
Examples include 3,3-trimethyl-spirophenatrooxazine, and organic medium compounds with a boiling point of 150°C or higher include alcohols, esters, ketones, carboxylic acids, acid amides, ethers, azomethines, and sulfides. , aromatic hydrocarbons,
and aliphatic hydrocarbons. Specific compound names include cetyl alcohol, stearic acid, lauryl laurate, stearamide, and the like.

The photochromic pigment obtained by encapsulating the above composition has the following properties:
There is an advantage that separation of the spirooxazine compound and the organic medium compound can be suppressed, and a temperature-dependent photoluminescent composition can be maintained in a predetermined medium.

The photochromic coating layer is formed on the surface of the substrate by a method such as brush coating, spray coating, screen printing, gravure printing, or textile printing with an ink or paint obtained by mixing and dispersing the photochromic pigment in a polymer resin solution or resin emulsion. .

Furthermore, if necessary, a protective layer may be provided on the surface of the coating layer for the purpose of improving physical strength such as abrasion resistance and water resistance, and light resistance.

The ink or paint may contain ordinary dyes and pigments,
Extender pigments, ultraviolet absorbers, antioxidants, anti-aging agents, etc. may be added, and a colorless pattern layer may also be added to the coating amount.

The temperature which influences the development of the photochromic properties of the coating layer can be adjusted depending on the organic medium compound of the photochromic pigment used, and a predetermined temperature can be set within the temperature range of approximately 10 to 50°C.

Effect: The coating layer of the photochromic decoration of the present invention not only changes color in response to irradiation with ultraviolet rays or sunlight, but also can control the color change caused by the light irradiation due to temperature changes. By applying this in combination with temperature changes, it is possible to repeatedly develop multi-stage color changes. Furthermore, if a coating layer containing a photochromic composition having a different photochromic initiation temperature is provided for each specific portion of the substrate surface, the decorative body will be able to exhibit even more color changes.

Example 2 g of 1,3,3-trimethylspiroindoline naphthoxazine, 30 g of controlled dispersion alcohol, 20 g of stearyl laurate, and 12 g of epoxy resin (Epicote 807, manufactured by Yuka Ciel Co., Ltd.) were uniformly dissolved at 120°C, and then mixed at 80°C. The solution was kept in solution.

Separately, prepare 100g of 15% gum arabic aqueous solution,
While maintaining the temperature at 70°C, the solution was emulsified to an average particle size of 5 μm using a homomixer, and 3 g of diethylenetriamine was gradually added dropwise. After continuing stirring for an additional 3 hours, the produced photochromic pigment in the form of microcapsules was centrifuged.

After dehydrating and drying this photochromic pigment, an appropriate amount was uniformly dispersed in a vehicle containing a vinyl chloride-vinyl acetate copolymer resin, and diluted with a solvent to obtain a spray paint.

A doll made of gonyl chloride whose surface is painted with the above-mentioned paint has a flesh-colored appearance in the dark, but when exposed to sunlight at an outside temperature of 25 degrees Celsius, it instantly changes to dark brown. It gave the appearance of tanned skin. When I then exposed it to sunlight and breathed on it at about 35 degrees Celsius, it almost instantly returned to its original skin color. When I left it at an outside temperature of 25 degrees again, it turned dark brown, and when I returned it to the dark, it became a skin color. This change could be repeated.

The photochromic pigment used in this example was 30
It exhibits photochromism only at temperatures below ℃ and does not exhibit photochromism above 30℃.

Effects of the invention The photochromic decoration of the invention is more temperature-dependent than conventional ones, so a combination of light irradiation and temperature changes can produce more complex changes in appearance, making it possible to create toys. It can be used in a wide range of applications, including clothing, daily necessities, light control materials, books, anti-counterfeiting, and display displays.

[Brief explanation of the drawing]

Figure 1 shows conditions 1 for the photochromic doll of the present invention.
State 1 is under light irradiation at a temperature below a predetermined temperature, Condition 2 is under light irradiation at a temperature above a predetermined temperature, and Condition 3 is State 2 in a dark place.

Claims (1)

[Scope of utility model registration request] (a) Spironaphthoxazine compound and (b) alcohols, esters, ketones, carboxylic acids, acid amides, ethers, azomethines, sulfides, and aromatic hydrocarbons on the entire or specific portion of the substrate surface. A temperature-dependent photochromic decoration coated with an ink or paint containing microcapsules containing a temperature-dependent photochromic composition comprising an organic medium compound with a boiling point of 150° C. or higher selected from aliphatic hydrocarbons and aliphatic hydrocarbons.