JP2000292563A - Composition for time indicator and time indicator provided with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To clearly judge an end point without being affected by environmental conditions and to prevent periphery from being aduusely affected by using a coloring matter (solvatochromic coloring matter) for indicating solvatochromism and a specific organic solvent. SOLUTION: For a time indicator for visually discriminating the effective period of an insecticide or the like, for example N-phonoxibetaine that is a solvatochromic coloring matter where an absorption spectrum is changed by the polarity or the like of a solvent in a solution state and, for example 1,3- butanediol and glycerin that are organic solvents whose melt point is -5 deg.C or lower are used. The time indicator that is obtained by loading the mixtures into a specific container using, for example, olefinic spunbonded nonwoven cloth changes its color from purple to colorless. As the organic solvent, alcohols and esters are used and those with a boiling point of 150 deg.C or higher at normal pressure are preferable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a time indicator, in particular, a pigment exhibiting solvatochromism, and by using a color change thereof, an insect repellent, an insecticide, a repellent,
The present invention relates to a composition for a time indicator for visually discriminating the validity period of a product having a limited validity period, such as a fungicide, a fungicide, a fragrance, a deodorant, and the like, and a time indicator holding the composition.

[0002]

2. Description of the Related Art Various indicators have been conventionally devised as indicators for visually determining the effective periods of insect repellents, fragrances, and the like. These contain sublimable dyes,
One utilizing the decolorization due to its volatilization, one containing a pH indicator and an alkaline substance, and utilizing discoloration due to the volatilization of the alkaline substance (JP-A-56-131684, JP-A-62-179640), Utilizing an indicator accompanied by a change in color tone by a chemical reaction such as a summation reaction or an oxidation-reduction reaction (Japanese Patent Laid-Open No. 60-95381), accompanied by a change in color tone by contact with atmospheric O2 gas, CO2 gas, moisture, etc. Using an indicator (JP-A-57-1048)
No. 84, JP-A-60-124681), a composition containing a dye and a volatile desensitizing component and utilizing color development by volatilization of the desensitizing component (JP-A-1-1611081, JP-A-2-276964). Publication).

[0003]

However, since these volatile components may have an unpleasant odor or contaminate the surroundings, they use a complex reaction mechanism or the like to change their color, so that environmental conditions, In other words, those that are not significantly affected by humidity, light, etc., and that do not show an accurate validity period, and whose color tone changes from colorless to colored, making it difficult to determine at which point the validity period ends. Etc., all had serious drawbacks. The present invention has been made in view of such circumstances, and solves the disadvantages of conventional time indicators.
It does not adversely affect the surroundings, is not affected by environmental conditions, causes color tone changes with a very simple mechanism, can easily set the validity period to be detected, and visually determines the end point of the validity period very clearly An object of the present invention is to provide a composition for a time indicator that can be made and a time indicator holding the composition.

[0004]

The object of the present invention is to provide a dye exhibiting solvatochromism (hereinafter referred to as a solvatochromic dye) and one or more organic compounds having a melting point of -5 ° C or lower (hereinafter, referred to as "solvatochromic dye"). This is achieved by causing a mixture comprising an organic solvent) to be retained on a support as a composition for a time indicator, and causing a change in color tone due to evaporation of the organic solvent. That is, the present invention is an indicator composition comprising a solvatochromic dye and one or more organic solvents, and the fact that the indicator composition is held on a support. It is a characteristic time indicator.

[0005]

Hereinafter, embodiments of the present invention will be described in detail. The composition for a time indicator of the present invention is characterized by containing a solvatochromic dye. Solvatochromism is a phenomenon in which the absorption spectrum usually changes depending on the type of solvent in the solution state.The energy difference between the ground state and the excited state of the solute molecule changes depending on the polarity of the solvent and the strength of the hydrogen bond. It is a phenomenon that occurs. Therefore, the time indicator of the present invention has a colorless or a certain color depending on the polarity of the coexisting organic solvent at the start of use, but the polarity of the entire time indicator composition changes due to the volatilization of the organic solvent. , The color tone changes to the end point. This change in color tone occurs only due to a change in polarity and strength of hydrogen bond, and does not involve a reaction or a structural change of the compound. Therefore, the mechanism of the color tone change is very simple and is not affected by environmental conditions. In addition, by selecting the type of solvatochromic dye and organic solvent to be used, a wide variety of color changes (for example, change from colorless to color, change from color to colorless, change from one color to a different color) Change, etc.), and the effective period can be easily set.

The solvatochromic dye used in the composition for a time indicator of the present invention includes, for example, merocyanine dye, pyridine-N-oxide and the like, and 1-ethyl-4-iodide used as a polar indicator.
Methoxycarbonylpyridinium, N-phenoxybetaine, azoniabetaine, Bruker indicator, Kosoir indicator, etc. can be used, but the present invention is not limited to such examples. These dyes may be used alone or in combination.
It can be used in combination of more than one species.

The organic solvent has a melting point of −5 ° C.
The following organic compounds can be used, for example, hexanol, heptanol, octyl alcohol, nonyl alcohol, decyl alcohol, benzyl alcohol,
1,3-butanediol, 1,5-pentanediol,
Alcohols such as ethylene glycol, propylene glycol, glycerin, butyl carbitol; esters such as ethyl benzoate, butyl benzoate, dibutyl phthalate, tricresyl phosphate, pyrethroid; methyl cellosolve, butyl cellosolve, diethylene glycol, dipropylene glycol, tripropylene glycol Ethers such as ethylene glycol, polyethylene glycol and polypropylene glycol; ketones such as methylpentyl ketone, methylhexyl ketone, diisobutyl ketone, γ-butyrolactone and isophorone; N-methylpyrrolidone, N, N-dimethylimidazolidone, N, N -A nitrogen-containing compound such as diethyltoluamide can be used, and those having a boiling point of 150 ° C or more at normal pressure are more preferable, but the present invention is not limited to only such examples. . Note that an organic compound having a melting point exceeding -5 ° C is not preferable because it may become a solid or a viscous liquid in a use environment, and the coloring property of the solvatochromic dye is lowered. Further, those having a boiling point of less than 150 ° C. volatilize in a short period of time, so that only a function as a short-time indicator can be exhibited, which is not preferable.

[0008] Some of the above organic solvents act as desensitizing components. Therefore, by including a desensitizing component exhibiting normal-temperature volatility in the composition for an indicator, it is possible to provide a time indicator that causes color development over time due to volatilization of the desensitizing component. Further, in the indicator composition containing a solvatochromic dye, two or more organic solvents having different polarities and a desensitizing component, by using a desensitizing component having a lower boiling point than the organic solvent used,
It is also possible to provide a time indicator that causes three or more color changes. The desensitizing component in the present invention refers to a compound exhibiting a desensitizing effect on the coloration of a solvatochromic dye by an organic solvent, and is not particularly limited as long as it exhibits normal-temperature volatility, for example, butyl cellosolve, dipropylene Organic solvents such as glycol and triethylene glycol can be used, but the present invention is not limited to only these examples.

In addition, by using at least one of the organic solvents as pyrethroids having volatility at room temperature, this compound functions as a solvent for dissolving the solvatochromic dye and also functions as an insect repellent active ingredient. And an insect repellent having a time indicator can be provided. The pyrethroid is not particularly limited as long as it exhibits normal-temperature volatility, and for example, (RS)-
(Z) -1-ethynyl-2-methyl-2-pentenyl (+)-cis / trans-chrysanthemate and the like can be used, but the present invention is not limited to only such examples.

[0010] Further, by using these room-temperature volatile pyrethroids as a desensitizing component, both the insect repellent active component and the desensitizing component can be used, so that the volatilization progress of the insect repellent active component and the color tone change are well correlated, and thus the time indicator of the present invention. Can be provided.

Further, a dye containing the above organic solvent as a desensitizing component may be used in combination with the indicator composition of the present invention, if necessary. These dyes are not particularly limited as long as they are soluble in an organic solvent. For example, fluoran dyes, rhodamine lactam dyes, leuco auramine dyes and the like can be used, but the present invention is not limited to these examples.

Further, a deodorant, an acaricide, a bactericide, a fungicide, and the like may be added to the indicator composition of the present invention, if necessary.

The time indicator of the present invention can be manufactured by holding the composition for an indicator on a support by a method such as coating, dipping, dropping, or the like. The support is not particularly limited, and paper such as filter paper, woven or knitted fabric, non-woven fabric,
Although a polymer absorber or the like can be used, the present invention is not limited to such an example. It is desirable that these supports have a color tone such that a change in the color tone of the composition for an indicator can be easily visually confirmed. Further, the indicator composition may be held by a method of enclosing it in a container made of a nonwoven fabric, a plastic film, or the like.In this case, one side is transparent so that the color tone change of the content composition can be easily visually confirmed. It is desirable to use a substrate.

Next, the present invention will be described in more detail with reference to examples, but the present invention is not limited only to these examples.

[0015]

Example 1 0.5 mg of N-phenoxybetaine,
1,3-butanediol 100 mg, glycerin 100
mg of the mixture was mixed with low-density polyethylene (film thickness 15
μm) is laminated on a polyethylene terephthalate film (hereinafter referred to as PET, film thickness 100 μm), and the other surface is laminated with a linear low-density polyethylene (film thickness 35 μm). Inner dimensions made of TO503WDO)
Put in a 40 mm × 70 mm container and seal with heat seal,
A time indicator was made. It produced a color change from purple to colorless in 4 months.

[0016]

Example 2 N-phenoxybetaine 0.5 mg, propylene glycol 100 mg, glycerin 100 mg
Is mixed with low-density polyethylene (film thickness 15μ)
m) laminated PET film (100 μm thick)
m), the other side is a linear low-density polyethylene (thickness: 35μ)
m) was placed in a container having an inner size of 40 mm × 70 mm made of an olefin-based spunbonded nonwoven fabric (product of Unitika Ltd., Elves TO503WDO) and sealed by heat sealing to produce a time indicator. It produced a color change from red to colorless in 3 months.

[0017]

Example 3 N-phenoxybetaine 0.5 mg, empentrin 40 mg, propylene glycol 100 m
g, a mixture of 100 mg of glycerin, an olefin-based span in which one side is laminated with a low-density polyethylene (thickness 15 μm) on a PET film (thickness 100 μm) and the other side is laminated with a linear low-density polyethylene (thickness 35 μm). Bonded nonwoven fabric (ELVES T, manufactured by Unitika Ltd.)
O503WDO) in a container having an inner size of 40 mm × 70 mm and sealed by heat sealing to produce a time indicator. It produced a color change from red to colorless in 4 months.

[0018]

As described above, according to the time indicators according to the first to fourth aspects of the present invention, the validity period to be detected can be simply set without affecting the surroundings, without being affected by environmental conditions. It is possible to provide a time indicator that can be set and the end point of the validity period can be visually judged very clearly.

Claims (4)

[Claims] 1. An indicator composition comprising a dye exhibiting solvatochromism and one or more organic compounds having a melting point of -5 ° C. or lower. 2. The organic compound according to claim 1, wherein the organic compound is selected from the group consisting of alcohols, esters, ethers, ketones and nitrogen-containing compounds having a boiling point of 150 ° C. or more at normal pressure. The composition for an indicator according to the above. 3. The indicator composition according to claim 1, wherein at least one of the esters is pyrethroid. 4. A time indicator, wherein the indicator composition according to claim 1, 2 or 3 is held on a support.