JPH05331033A - Gelatinous insect repellent - Google Patents

Abstract

PURPOSE:To obtain a gelatinous repellent uniformly and efficiently applicable to skin without causing a feeling of greasiness, capable of maintaining repelling effects on insect pests for a long period of time. CONSTITUTION:A gelatinous repellent comprises a water-soluble gel base such as carboxyvinyl polymer, purified water for gelatinizing the gel base, a liquid repelling agent for insect pests and a dispersant for the repellent. The repellent for insects is extremely readily spread on target skin and the application is uniformed. Water flow followed by application operation eliminates a feeling of greasiness on the coated face. Repelling effects are maintained for a long period if time by existence of the gel base.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved insect repellent composition for use on the skin surface of a human body for repelling insects such as mosquitoes.

[0002]

2. Description of the Related Art Already, a repellent for insects which has excellent repellency against insects such as mosquitoes, flies, gnats, flies, bedbugs, fleas, mites, etc. and has low toxicity to humans has been developed. There is. As this repellent drug,
For example, in addition to various pyrethroid drugs, those containing diethyltoluamide (hereinafter referred to as "diet") as a main component can be mentioned.

Conventionally, with respect to the above-mentioned repellent drug, it is general to disperse the repellent drug in an appropriate solvent and spray the dispersion onto the exposed skin surface of the human body. In addition to this method, a method of directly applying the dispersion liquid onto the skin surface, and a method of processing the repellent drug into an ointment and applying the ointment-like drug have also been used.

[0004]

In the above-mentioned spray application, unlike the other application methods,
Although it is advantageous in that the coating operation via hands is unnecessary, it has the following drawbacks.

That is, first of all, it is practically difficult to uniformly disperse an object occupying a considerably large surface area. Therefore, there is an excessive amount in the amount of drug applied. There may be a sticky feeling particularly in an excessive amount.

Further, in the process of spraying, a considerable amount of the spray liquid is also dissipated, so that the utilization efficiency of the repellent drug is deteriorated.

Further, since the repellent drug in the adhered state directly exists on the skin surface, the adhered drug is relatively easily lost. Therefore, there is a drawback that the duration of the repellent effect is short.

In addition, in the above-mentioned method of applying the liquid dispersion of the drug, the same drawbacks as described above occur, and since the surface to be applied is considerably wide, the sticky feeling associated with the application of the drug is very high. It was not suitable for use. This drawback is even stronger when applying the drug in the ointment form described above.

Therefore, in the present invention, a repellent against insects is not applied to the skin surface without stickiness.
The object of the present invention is to provide a gel-like insect repellent agent that can be applied uniformly and efficiently and that can keep the insect repellent effect for a long period of time.

[0010]

In order to achieve the above-mentioned object, the present invention comprises a gel insect repellent as follows. That is, it is characterized by comprising a water-soluble gel base, purified water and a gelling agent for gelling the gel base, a liquid insect repellent drug, and a dispersant for the repellent drug. To do.

In the above-mentioned present invention, examples of the water-soluble gel base include carboxyvinyl polymer. As the gelling agent, alkali hydroxide or amine such as triethanolamine can be used.

Further, as repellents against insects, drugs such as diet, 2,3,4,5-bis (Δ2-butylene) -tetrahydrofurfural, and di-n-propyl isocinchomeronate which are liquid at room temperature. Can be applied.

As the dispersant for the repellent drug, alcohols such as isopropyl alcohol and ethyl alcohol, as well as various emulsifiers such as polyoxysorbitan carboxytrioleate, which are safe for the human body, can be used.

Regarding the method for producing the gel insect repellent of the present invention, the gel base is dissolved in purified water in advance, the insect repellent is mixed therein, and then the dispersant is mixed and stirred, Further, it can be performed by mixing a gelling agent, but it is not limited to this production method, and various other methods can be used.

Further, regarding the blending ratio of each component in the gel insect repellent of the present invention, the gel base is 0.5 to 2.0%.
(% Is% by weight, and the same applies hereinafter). This is because at a concentration in this range, a viscosity suitable for coating on the target surface can be obtained. That is, when the amount of the gel base is 1.5% or more, it is possible to obtain a viscosity of 60,000 centipoise or more with a B type viscometer, and when the amount is 2.0% or more, the viscosity becomes excessive, which may cause problems in production and use. This is because it may become an obstacle.

Further, the compounding amount of the repellent drug is 3 to 12
% Is preferred. In other words, 3% or more considers the persistence of repellent efficacy, and 12% or less considers economy and safety.

The amount of the dispersant is preferably 10 to 50%, depending on the amount of the repellent agent.
This is because if the amount is 10% or less, the fraction of the repellent drug may be insufficient, and if it is 50% or more, gelation may be hindered.

Further, the gelling agent depends on the amount of the gel base.
The compounding amount can be 0.5 to 2.0%. It should be noted that this amount is an amount necessary for neutralization, and for example, it is preferably added in an amount of 2.0 to 3.0% with respect to the amount of the gel base.

The purified water is preferably 40% or more of the insect repellent according to the amount of gel base. This is because it relates to the action and effect of the coating operation described later.

[0020]

In the present invention, the following actions occur. First, the repellent agent is contained in the insect repellent agent in a uniform state by the action of the dispersant even in the presence of water.

Further, the gel base retains a part of purified water between its molecules and, in combination with the presence of water and a gelling agent, acts to thicken the entire insect repellent. ..

Further, the water-holding gel base flows out onto the target surface to be coated during the coating operation. At this time, the outflow water evenly disperses the repellent agent contained therein on the above-mentioned target surface.

Further, the gel base still in a hydrated state functions as a kind of extremely thin film on the target surface, and imparts a sustained release property to the volatilization of the repellent drug contained therein.

[0024]

EXAMPLES Next, examples of the present invention will be described. First, the gel insect repellent in the examples was prepared as follows. That is,
Purified water was added to carboxyvinyl polymer as a gel base to prepare a 2% aqueous solution thereof. To 40 g of this aqueous solution, 5 g of diet as a repellent, 50 g of isopropyl alcohol as a dispersant, and 4 g of purified water were mixed.
Then, 1 g of triethanolamine as a gelling agent was added to this mixed solution with stirring. As a result, a gel insect repellent having an appropriate viscosity was obtained and used as a sample. In addition,
This gel was colorless and transparent.

Next, the above-mentioned sample was taken out in a state of being attached to a finger, and was applied to the entire surface of the test subject by rubbing the exposed part from the wrist to the elbow.

At this time, a very small amount of moisture was felt on the target skin surface, and no sticky feeling was generated on the coated surface. Regarding the coating operation,
It could be expanded to about 1500 cm ² per unit amount (1 g). The total amount of this sample used was 2.77 g for subject A, 3.55 g for subject B, and 3.40 g for subject C.

Next, a 30 cm cubic nylon mesh cage was prepared, and adult male and female adults of Aedes albopictus which were being subcultured were released in the cage.

10 minutes from the time of applying the above-mentioned sample,
After 30 minutes, 60 minutes, 180 minutes, 360 minutes, and 480 minutes had passed, the arm part from the wrist to the elbow to which the sample of the subject was applied was inserted into each of the above-mentioned cages and left for 2 minutes.
Then, after pulling out the above-mentioned arm portion, the mosquitoes in the cage were anesthetized with chloroform to kill insects, and the numbers of sucked and unsucked female mosquitoes were counted.

The results of these counts are shown in Table 1 below, with the number of sucked blood in the numerator position and the number of females tested in the denominator position.

[Table 1]

The control in Table 1 is of a type in which a dispersion liquid containing 5% diet is spray-sprayed, and the result is that the same test subject is subjected to the above-mentioned treatment from the wrist to the elbow. It was obtained by spray-spraying the dispersion liquid of (1) above, inserting the sprayed portion into the cage in the same manner as described above, and counting in the same manner as above.

The amount of the above dispersion liquid used was 3.28 g for subject A, 3.22 g for subject B and 4.02 g for subject C. The blank in Table 1 is the result when no repellent drug was used for the subject.

From the results shown in Table 1, the gel-like insect repellent according to the present invention can stably exhibit an effective repellent effect over a long period of time, and the repellent effect can be obtained by reducing the amount of the repellent drug. It can be confirmed that is being effectively exerted.

[0033]

Since the present invention is constructed as described above, the following effects are exhibited. Since the insect repellent according to the present invention contains the gel base in a gelled and water-containing state as a whole and the repellent drug is uniformly dispersed and contained therein, the insect repellent can be applied on the target skin surface, and During this coating operation, water may flow out from the gel base. Therefore, the insect repellent on the target skin surface can be extremely easily spread, and therefore, the application operation itself can be facilitated and the application of the repellent drug can be made uniform.

The generation of runoff water during the above-mentioned coating operation is combined with the diffusion action of the contained gel base material on the coating surface to eliminate the sticky feeling on the coating surface.

Further, the uniform application of the repellent agent and the sustained release of the repellent agent due to the presence of the gel base on the coating surface contribute to the maintenance of the insect repellent effect for a long period of time. .. Therefore, the insect repellent effect can be stably exerted over a long period of time, and the insect repellent drug can be used efficiently, that is, economically.

Claims (2)

[Claims] 1. A water-soluble gel base, purified water and a gelling agent for gelling the gel base, a liquid insect repellent, and a dispersant for the repellent. A characteristic gel-like insect repellent. 2. The gel insect repellent according to claim 1, wherein the gel base is a carboxyvinyl polymer.