JPH0234029Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a reversible thermochromic flocking material. Specifically, it relates to a reversible thermochromic flocking material that changes color due to temperature changes and hides the printed image on the surface of the support. It adds decorativeness, magic, surprise, fun, etc., and significantly improves marketability.

The details of the present invention will be explained below with reference to the drawings.
FIGS. 1, 2, and 3 are enlarged longitudinal cross-sectional views of the main parts of the reversible thermochromic flocking material of the present invention.

As the support 2, any base material that has conventionally been used for flocking processing is effective, and examples include textiles, plastics, rubber, paper products, wood products, metal products, glass, and ceramic materials. A printed image 3 of characters, alphanumeric characters, symbols, designs, etc. is formed on the surface, and a reversible thermochromic resin layer 4 covering the image 3 is provided, and countless piles are formed on the surface of the resin layer 4. 5 is planted to constitute a reversible thermochromic flocking material.

In the above, the thermochromic resin layer 4 is a resin layer in which a reversible thermochromic material and, if necessary, general dyes and pigments are blended, and at a predetermined temperature or lower or higher,
It functions to hide the printed image 3 by reversibly changing into colored (colorless) or colored () and colored ().

As the above-mentioned reversible thermochromic material, a conventionally known material consisting of a combination of an electron-donating color-forming compound and an electron-accepting color developer is effective.

For example, the applicant has already proposed the
Reversible thermochromic materials disclosed in Japanese Patent Publication No. 44706, No. 51-44707, and Japanese Patent Publication No. 51-44708 are suitable, and these materials change red, blue, yellow, green, orange,
Violet and other combinations can reversibly and instantly change subtle colors from colored to colorless to colored, and color changes can also be made by adding ordinary dyes, pigments, and fluorescent pigments (non-color-changing colorants). It is effective because it is possible to change from colored () to another different colored () by using them together.

The resin in the thermochromic resin layer 4 includes acrylic, polyurethane, polyvinyl acetate, polyvinyl chloride, polystyrene, synthetic rubbers, cellulose, starch, melamine, urea resin, etc., which have been conventionally used for flocking processing. , these alone or a blend of two or more are effective.

The thermochromic resin layer 4 is formed on the support 2 by blending a reversible thermochromic material with the above-mentioned resin emulsion or resin solution, or by applying, spraying, printing, etc. a processing liquid to which a non-chromic coloring agent is added. It is formed in the shape of a spot on the entire surface or a part of the surface.

Here, in order to further improve the sensitivity and sensitivity of discoloration due to temperature changes, it is effective to encapsulate the thermochromic material in microcapsules (0.5 to 50 μm) and use a processing fluid in which these are dispersed. Further, in order to make the thermochromic function permanent, an ultraviolet absorber, an anti-aging agent, etc. can be added to the treatment liquid as necessary.

The printed image 3 is usually formed using a conventional printing technique using a general-purpose printing ink (non-color-changing ink), but a printed image using a thermochromic ink is also effective.

It is effective that the printed image 3 is constructed so that visibility is obstructed when the thermochromic resin layer 4 is colored, and is visible when the layer fades or becomes pale in color. Furthermore, specifically, the printed image 3
The combination is such that the visual density is lower than the visual density when the thermochromic resin layer 4 is colored, or the combination is substantially the same as or similar to the color when the layer is colored. Therefore, the effect of concealment of the printed image 3 can be effectively visualized.

Pile 5 is conventionally made of general-purpose materials such as nylon, rayon, acrylic, acetate, polyvinyl chloride,
Polyvinylidene chloride, polyvinyl alcohol, polychlor, cotton, asbestos, glass fiber, etc.
0.5 to 20 denier and 0.3 to 3 mm length, thicker denier, and longer pile are used depending on the purpose. In addition, in order to provide contrast to the visual sense or to make it easier to see through color changes, transparent to semi-transparent bright nylon, glass fiber, etc. can be used as piles, and combinations of different deniers, lengths, different types of fibers, etc., and crimping can be used. Pile with shape, curved shape, etc. (see Figure 3)
can be used as appropriate.

In addition, by applying a low-viscosity machining fluid, the piles can be planted in a non-vertical manner, or after the piles have been planted, they can be heated,
By applying pressure or other means, the pile is deformed (third
(See figure) Visual perception can be changed.

Next, an example of manufacturing the reversible thermochromic flocking material of the present invention will be described.

<Production Example 1> A pink general printing ink is used for gravure printing on a white support surface, and a plurality of heart-shaped images are arranged vertically and horizontally in a grid pattern, and then the color changes from pink to colorless at 47°C. A processing liquid in which a thermochromic material is dispersed in an acrylic emulsion is used to cover the printed image and adhere it in a grid pattern. Next, a bright nylon pile (cut length: 1.5 mm, single fiber fineness: 3 d) was planted on the surface of the resin layer by a known method to obtain a reversible thermochromic flocking material.

In this flocked material, the heart pattern was not visible at room temperature, but at temperatures above 47°C, the reversible thermochromic resin layer disappeared and the heart pattern was visible.

<Production Example 2> A ``polka dot'' pattern was printed by screen printing using light brown general printing ink on the surface of a white support made of urethane foam fused to nylon fabric. Next, a processing liquid in which a reversible thermochromic material that changes color from brown to colorless at 35°C is dispersed in a polyurethane emulsion is applied onto the printed image, and a curled bright nylon pile (cut length: 1 mm, single fiber fineness: 2d) was flocked to obtain a reversible thermochromic flocking material. This flocked material is
It appears brown at room temperature, and a brown and white polka dot pattern is visible at temperatures above 35°C.

<Production Example 3> On the surface of a pale yellow support, the words "Please cool down" were printed by screen printing using pale blue general printing ink. Next, a processing liquid in which a reversible thermochromic material that colors blue at 10°C or less and a yellow fluorescent pigment are dispersed in a polyvinyl acetate emulsion is applied onto the printed image, and then a rayon pile (cut length: 0.4 mm, Single fiber fineness: 1d) was flocked by a conventional method to obtain a reversible thermochromic flocking material. In this flocked material, the words "Please cool" can be seen on the fluorescent yellow support surface at room temperature, but at temperatures below 10°C, the reversible thermochromic resin layer develops color and the image is no longer visible.

<Manufacturing Example 4> Use light red general printing ink in gravure printing on a white support surface to ``cover up to your shoulders.''
The characters were printed. Next, a processing liquid in which a reversible thermochromic material that colors red at 40°C or higher is dispersed in an acrylic emulsion is applied onto the printed image, and acrylic piles of different cut lengths (single fiber fineness 2d, Cut lengths of 0.7 mm and 1.5 mm) were planted in a dispersed manner to obtain a reversible thermochromic flocking material for stuffed dolls. With this flocked material, the pale red printed image could be seen at room temperature, but at temperatures above 40°C, the reversible thermochromic resin layer developed color, impeding vision.

The reversible thermochromic flocking material of the present invention is constructed as described above, and not only satisfies the tactile sensation and visual sense as a flocking material, but also allows the color change of the reversible thermochromic resin layer to be seen through the piles. , can provide subtle contrast and taste, and can also hide the surface of the support and the printed image on the surface of the support, eliminating the monotony of conventional flocked products, and making it suitable for a variety of products, such as toys (dolls, dolls, etc.). Clothing, interior decoration, accessories, stuffed animals, etc.), entertainment, costume accessories, textile goods (curtains, curtains, artificial flowers, pennants, cap badges, hats, marks, jackets, blankets, neckties, towels, tablecloths, T-shirts, etc.) , wooden products (plywood boards, wooden boxes, wooden bulletin boards, etc.), paper products (wallpaper, letters, calendars, picture books, posters, etc.),
It can be effectively applied to plastic products and other products that require decoration, taste, temperature indication, magic properties, etc., and can significantly improve their marketability.

[Brief explanation of the drawing]

1, 2, and 3 are enlarged longitudinal cross-sectional views of the main parts of an embodiment of the reversible thermochromic flocking material of the present invention. 1... Reversible thermochromic flocking material, 2... Support, 3
...Printed image, 4...Thermochromic resin layer, 5...Pile.

Claims (1)

[Scope of utility model registration request] A reversible thermochromic resin layer 4 covering the printed image 3 on the surface of the support 2 is provided, and countless piles 5 are formed on the surface of the resin layer 4.
Reversible thermochromic flocking material 1.