JPH06264014A - Ink that forms color by moisture - Google Patents

Abstract

PURPOSE:To obtain an ink composition that forms color by contact with water. CONSTITUTION:This ink composition is obtained by dispersing a coloring material prepared by drying a water-soluble resin containing an adsorbed water-soluble dye and pulverizing it, and a binder or an oil-insoluble water absorbent in an organic solvent.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-reactive label which is attached to the inside of an electric product or the like used outdoors and used to determine whether the electric product or the like has a history of being submerged. The present invention relates to a moisture coloring ink used.

[0002]

2. Description of the Related Art Radios, video cameras, pagers,
Electric appliances and the like used outdoors such as mobile phones have a relatively high risk of getting wet with rain or splashing with water, so that some degree of water resistance is considered. However, if you drop it in a puddle or drop it in a container filled with water, the internal circuits may get wet and the function as an electrical product may be impaired. , Is subject to paid repairs due to the carelessness of the user, that is, the general consumer. However, it is difficult to determine whether the cause of the failure is due to submersion in water or in the range of normal use, which may cause trouble.

Therefore, a label coated with a water-based ink is adhered to the inside of the product in advance, and when a failure occurs, the state of the label is checked to see if the water-based ink is bleeding or discolored. The cause of the failure was determined by whether or not

However, in the conventional label, (1) the bleeding ink stains the inside of the machine. (2) It is difficult to control the amount of water necessary for bleeding, and as a result, bleeding does not occur unless a large amount of water acts. (3) If the same type of ink is available, the label can be tampered with. (4) When an ink using a cobalt-based or amine-based dye is used, it can be determined that the ink is submerged due to the discoloration of the ink, but when it is dried, it returns to its original state and cannot be identified. (5) Although there is an ink containing a coloring material in which a dye is encapsulated in microcapsules, the manufacturing cost is high and the ink cannot be used for low-priced articles. There was a drawback.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above conventional circumstances, and it is clearly discriminated that the colored layer changes due to the submersion of the product and the change occurs even after drying. It is possible to provide an ink that can be produced, has no problem of polluting the inside of the machine, and is inexpensive.

[0006]

That is, the present invention is a water-based color-forming ink containing a water-soluble resin having a water-soluble dye adsorbed therein, and a coloring material obtained by drying and finely powdering the water-soluble resin.

The water color-developing ink of the present invention will be described in detail below. That is, the moisture coloring ink of the present invention is a coloring material,
It is composed of a binder and an organic solvent, and further contains a non-oil-soluble water absorbing material as required. As the colorant, a water-soluble resin having a water-soluble dye adsorbed thereon is dried and made into a fine powder of several tens of μ or less.

The water-soluble dye is selected from acid dyes, basic dyes (including cationic dyes), direct dyes, reactive dyes and the like.

The water-soluble resin is arbitrarily selected from known ones such as cellulose resins and used.

The binder is used for fixing the microcapsules and the water absorbing material to the label substrate, and any resin soluble in an organic solvent can be used. For example, polyester resin, acrylic resin, polyamide resin, polyacetal resin, polyurethane resin, epoxy resin, petroleum resin and the like can be used. The water absorber is starch,
Select from powders such as kaolin, talc, finely powdered cellulose, aluminum silicate, silicon oxide, and calcium carbonate, or water-absorbent resins such as polyacrylic acid, isobutylene maleic anhydride, and polyethylene oxide according to the dye used. To do.

[0011]

The colored layer is formed on the label substrate by using the ink having the above-mentioned constitution. At this point, the colored layer is colorless because the solvent is volatilized and is not affected by moisture. However, when water is added during use as a label, both the water-soluble resin and the water-soluble dye are dissolved and the dye develops color. The colored dye forms a colored layer for dyeing the binder and the water absorber. Since the coloring layer uses the dye as described above, the color of the binder or the water absorbing body is not lost even after the water content is evaporated and dried.

The label using the moisture-coloring ink of the present invention having the above-mentioned structure is used not only for electric appliances and precision instruments which cause troubles such as failure due to adhesion of water or submersion, but also for transporting or storing containers. It can be used on the bottom of the case, as an indicator to detect water leaks in water pipes, boiler pipes, water pumps, etc., as a means to check the route of water leaks of various equipment and facilities, or as a teaching material that can draw pictures with water. It can be used for toys, etc.

[0013]

EFFECTS OF THE INVENTION Since the water color developing ink of the present invention has the above-mentioned constitution, it can be clearly discriminated that the water color ink has become wet even after being wet by water due to submersion and the like and then the ink is dried after a lapse of time. it can. The dye will not run off the label when it gets wet and will not contaminate the inside of the device. By selecting the type of the water-soluble resin used, the type and amount of the binder and the water absorber, the sensitivity of color development due to moisture and the color development speed can be controlled. Has the effect.

Claims (2)

[Claims] 1. A moisture-coloring ink comprising a water-soluble resin having a water-soluble dye adsorbed thereon, and a coloring material which is dried and finely powdered. 2. A water color ink according to claim 1, wherein a non-oil-soluble water absorbing material is added.