JPH01141975A - Device for indicating lapse of time - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a period indicator, and is particularly applicable to certain types of processed foods (instant noodles, oil sweets, semi-fresh sweets, etc.)
Effective for pharmaceuticals (antibiotics, vaccines, etc.), insect repellents, deodorants, disinfectants, refrigerant gas, photosensitive films and photographic papers against visible light and X-rays, cosmetics, batteries, ions, chemicals, etc. When applied to products that have a limited shelf life, or blood for transfusion or blood components that also have a limited shelf life, it is possible to tell at a glance whether or not the product is within its shelf life. (referred to as "time indicators" or simply "indicators").

<Prior Art> There are methods for expressing periods such as expiry dates of products as described below.

For example, in volatile drugs, the active ingredient may be in solution or
In some cases, these vapors are wax-like and visible from the outside of the container. This type of product cannot be applied to all products because the active ingredient itself is limited to vaporization. As an indicator that shows the period regardless of the active ingredient, it uses the vaporizability of substances to reduce the degree of coloring due to the volatilization of colored liquids (including those absorbed in gels) and the volatilization of sublimable dyes. There are things that have been done. However, the volatilization of substances is highly dependent on the effects of temperature and humidity, making it difficult to predict the exact period, and there is a risk that the volatilized substances may contaminate the surrounding air.

Another example is a time indicator that can determine the elapsed time based on color changes caused by light, temperature, humidity, or gases such as oxygen gas and carbon dioxide gas (C(h)) in the atmosphere.

However, light, temperature, and humidity change significantly in daily life, so if you create a time indicator that uses these factors to measure the passage of time, the color will change before the scheduled period elapses. It is difficult to obtain a stable time indicator because the time indicator does not change color even after the scheduled period has elapsed.

In addition, in a bag made of a plastic film that has a certain amount of oxygen permeability, 0.2
A method in which a coloring agent that changes color depending on the amount of water is placed, sealed in a vacuum state, and the coloring agent changes color due to the 0□ that penetrates through this plastic film over time, thereby measuring the elapsed period of time. was also considered, but the amount of oxygen permeation through plastic films generally varies depending on the surrounding temperature and humidity, so it was still difficult to obtain a stable time indicator that could always measure the passage of time.

Furthermore, by using COI instead of 0□, a coloring agent that changes color depending on the pH of the atmosphere is placed in a bag made of plastic film that is permeable to a certain amount of carbon dioxide, and the plastic film is sealed in a vacuum. Some methods change the color of the colorant by changing the pH of the atmosphere due to COl penetrating through the film, but this time indicator does not indicate the shelf life of the fragrance, deodorant, or insect repellent, i.e. several months. In addition to the drawback of not being able to measure time of several years and changing color in a much shorter period of time (several hours to tens of hours), this time indicator is also sensitive to changes in humidity, and after all, a constant period of time has elapsed. cannot be displayed.

<Problems to be Solved by the Invention> Therefore, the present invention is capable of measuring the effective period of products such as insect repellents, fragrances, deodorants, etc., that is, periods of several months to several years; The period is difficult to change depending on temperature, humidity, and other conditions.

Its purpose is to provide a stable time indicator.

<Means for solving the problem> That is, the present invention mixes a substance that changes color due to a reaction that causes color change, such as an oxidation-reduction reaction or a neutralization reaction, in a reaction retarding medium, and a part of the container. This is a period elapsed indicator characterized in that a reactant that causes a reaction accompanied by a color change in the above-mentioned color changing substance is enclosed in the container. Thereby, a stable period elapsed display that is not affected by light, humidity, and other gases in the atmosphere is obtained.

<Detailed Description of the Invention> An embodiment using a cylindrical body as a container will be described below with reference to the drawings.

FIG. 1(a) and FIG. 1(b) are explanatory diagrams for explaining the present invention in an easy-to-understand manner, and the present invention will be explained in detail below using FIG. The body 1 and lid 2 of ) are cylindrical bodies, in which two substances each capable of causing an oxidation-reduction reaction, a neutralization reaction, etc., a color-changing substance 3, and a reactant 4 are mixed together with a reaction-retarding material. The main body l of the cylindrical body is provided with a cut line 6 for exposing the substance f3 that changes color, and the lid body 2 of the cylindrical body is provided with a seal for sealing the filled reactant 4. A seal 5 is attached.When starting the period display of the cylindrical body consisting of these two parts, the user cuts the main body 1 of the cylindrical body shown in FIG. 1(a) along the perforation line 6, and The display can be started by peeling off the seal 5 of the lid 2 and combining them as shown in FIG. A combination of substances that cause a change is good, for example, a substance 3 that changes color and reacts with a reactant 4 in a colored state to become colorless or a color different from the initial color, and a substance 3 that changes color and a reactant 4 that change color. A possible case is that both are colorless and become colored during the reaction.An example of such a reaction will be described below.

When a redox reaction is carried out between a substance A that changes color and a reactant B, for example, the substance A that changes color is a dye such as a colored redox indicator, and the reaction agent B is a reducing agent. In this case, the dyes used for the substance A that changes color include methylene blue, indigo carmine, safranin T, indigo sulfonic acid, phenosafranine, diphenylamine, diphenylbenzine, erioglaucine A, xy-L/7 cyanol FF, eriochrome B, P-nitrodiphenylamine, and the like. In addition, reactant B
Examples of substances used for this include L-ascorbic acid, hydroquinone, catechol, pyrogallol, hydrocerphite, and thiourea.

When a neutralization reaction is performed between the substance A that changes color and the reactant B, for example, the substance A that changes color is given an acid @! By using an alkaline substance as the I substance and the reactant B, a combination is obtained in which at least one of A or B is mixed with a dye that causes a color change before and after the reaction, such as a pH indicator. In this case, as the acidic substance used for the discoloring substance A, hydrochloric acid aqueous solution, sulfuric acid aqueous solution, nitric acid aqueous solution, etc. can be considered, and as the alkaline substance used for the reactant B, sodium hydroxide, potassium hydroxide, lithium hydroxide, carbonic acid, etc. Examples include aqueous solutions such as calcium. In addition, as for the color change here, the dyes to be mixed with the substance that changes color include phenolphthalein, methyllend, P-nidocaphenol, bromofresol purple, chlorophenolend, firomthymol blueenol red, rosolic acid, and cresol red. , curcumin, thymolphthalein, alizarin yellow, etc.

The reaction retarding medium described in the present invention is an additive for the purpose of retarding the reaction between the substance IA that changes color and the reactant B, and includes various thickeners, various gels, and various resins. for example,
If the discoloring substance A and the reactant B are both water-soluble, carboxymethylcellulose, ethylcellulose, sodium alginate, sodium polyacrylate, polyacrylamide, gum arabic, gum tragacanth, locust bean gum, polymethylpyrrolidone, polyvinyl alcohol, agar, Examples include starch, gelatin, etc., and crosslinked products thereof. Further, when the substance A that changes color and the reactant B are both oil-soluble substances, examples thereof include polyacrylic acid resin, polystyrene resin, polyester resin, and the like.

The cylindrical body described in the present invention includes polyethylene, Teflon,
Examples include acrylic resin, polycarbonate, silicone tubes, glass tubes, etc. Transparent or light-colored tubes that allow the contents to be seen from the outside are preferable, but they are not necessarily limited to cylindrical shapes, such as ribbon-shaped, plate-shaped, etc. Needless to say, it may have any shape.

<Example><Example1> (1) Discoloring substance A and reactant B were prepared with the following compositions, and A had an inner diameter of 3 mm φ as shown in 1 in Figure 1 (a).
, is enclosed in a cylindrical body with a length of 8 cm, and has an inner diameter of 5 as B shown in 2.
It was sealed in a cylindrical lid with a diameter of IIIffl φ and a length of 1.5 cm.

Substance that changes color A Methylene blue 0.2 parts by weight agar
・・・・・・ 5.6 Water
・ ・ ・ ・ ・94.2 Total 10
0.0 parts by weight Reactant B L-ascorbic acid...0.9 parts by weight Sodium polyacrylate...1B. 2 Water
・ ・ ・ ・ ・80.9
〃Total 100.0 parts by weight (2) Cut the main body l shown in FIG. 1(a) obtained in the above (1) along the perforation line 6, and combine it with the lid body 2 shown in FIG. 1(a). When I started displaying the period, the cylindrical body changed from blue to colorless in about 3 months.

<Example 2> (1) Prepare color-changing substance A and reactant B with the composition shown below, create a period elapsed indicator in the same manner as in Example (1),
After starting the display, the tube metal body changed from blue to colorless in about a month.

Substance that changes color A Indicocarmine 0.2 parts by weight Carboxymethylcellulose 15.2 Water
・ ・ ・ ・ ・84.6 Total 100.0 parts by weight Reactant B L-ascorbic acid 1.0 parts by weight Carboxymethylcellulose 4.7 Water
・ ・ ・ ・ ・94.3 Total 10
0.0 part by weight <Example 3> (+) Prepare the discoloring substance A and the reactant B with the composition shown below, and create a period elapsed indicator in the same manner as in Example (1),
After starting the display, the cylindrical body changed from red to colorless in about two months.

Substance that changes color A Sodium hydroxide... 0.4 parts by weight Phenolphthalein... 0.1 Agar ・
・・・・・・ 5.9〃Wed・
・ ・ ・ 93.6 Total 100.0 parts by weight Reactant B Hydrochloric acid 0.7 parts by weight Carboxymethyl cellulose 10.0 Water
・ ・ ・ ・ ・89.3 Total 10
0.0 parts by weight <Effect of the invention> The period elapsed indicator as described in the present invention is not affected by atmospheric gases, light, humidity, etc., and therefore can display a relatively stable period. By cutting at an arbitrary position, the user can now easily set the required display period.

[Brief explanation of the drawing]

FIG. 1(a) is an explanatory diagram showing one embodiment of the period elapsed display of the present invention. FIG. 1(b) is an explanatory diagram showing an example of use of the period elapsed indicator of the present invention. 1.2...Cylindrical body 3...Substance A that changes color 4...Reactant B 5...Sealing seal 6...Tear line Patent application Kazuo Suzuki, Representative of Toppan Printing Co., Ltd. Figure 1

Claims (2)

[Claims] (1) A substance that changes color due to a reaction that causes color change, such as an oxidation-reduction reaction or a neutralization reaction, is mixed in a reaction retardation medium in a container, and a part of the container is subjected to a reaction that causes color change to the substance that changes color. A period elapsed indicator characterized by enclosing a reactive agent that causes the elapse of time to rise. (2) The period elapsed indicator according to claim 1, wherein the container is a cylindrical body.