JPS63145204A - Insecticide - Google Patents

Abstract

PURPOSE:To obtain a safe and novel insecticide sustaining effects for a long period with a relatively small amount, containing 3-phenyl-2-propenoic acid, namely cinnamic acid, as an active ingredient. CONSTITUTION:An insecticide containing cinnamici acid, namely 3-phenyl-2- propenoic acid (producible from benzaldehyde, acetic anhydride and potassium acetate by Perkin reaction) which exists in a liberated form or as an ester in the natural world and has high safety, as an active ingredient. Since cinnamic acid is a solid having low sublimation, preferably cinnamic acid is impregnated into a proper carrier such as filter paper, etc., or dispersed into another subliming insecticide such as camphor to enlarge surface area and used. The resulting material is packed into an air-permeable bag such as Japanese paper and put in a moistureproof cellophane having bored small holes.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a novel insect repellent.

[Conventional technology]

There are many insect repellents and insecticides that have been used in the past, but unlike general agricultural and horticultural insecticides, there are not many insect repellents for clothing that are used in clothing storage furniture and containers in the home.

This is because it has low toxicity to humans and livestock, does not contaminate or damage clothing, etc., and is effective against specific soils such as burrs.

Therefore, insect repellents that have been used for a long time, such as naphthalene, camphor, and para-dichlorobenzene, are still used in considerable quantities because of their good properties.

[Problem that the invention seeks to solve]

However, these insect repellents have low efficacy and are dispersed in a relatively short period of time, so they do not maintain their effectiveness for a long period of time, and often require replenishment, resulting in a large amount of use.

It has been desired to develop a new insect repellent that is safe and effective for a long period of time with a relatively small amount.

[Means for solving problems]

As a result of various studies on compounds related to or peripheral to compounds used as insect repellents, the present inventor found that 3-phenyl-2-propenoic acid (hereinafter referred to as cinnamic acid) has a slight sublimation property. The present invention was achieved by discovering that the insecticide has excellent insecticidal properties due to its volatile gas.

Cinnamic acid is a solid with a melting point of 133°C, naturally occurring free and
It is an extremely safe compound that exists as an ester. It is also produced from benzaldehyde, acetic anhydride, and potassium acetate through the Perkin reaction.

When a small amount of cinnamic acid was placed in an IQ beaker, several burr larvae were placed in the beaker, the beaker was covered with a lid, and left for several days, most of the larvae were killed by the vapor volatilized from the cinnamic acid.

Since cinnamic acid is a solid with low sublimability, it is desirable to use it by impregnating it into a suitable holding carrier such as filter paper, or by dispersing it in another sublimable insect repellent, such as camphor, to increase its surface area. The cinnamic acid thus obtained is stored in the same way as conventional sublimation insect repellents, either by filling it into a breathable bag such as Japanese paper, or by making small holes in moisture-proof cellophane or the like.

〔Example〕

Place 1 g of a drug containing cinnamic acid/camphor = 20/80 in the bottom of a glass lidded container with an internal volume of approximately IQ, and then place 10 burr larvae together with wool in a stainless steel container of approximately 0.08Q, and apply a 1 Ω
It was placed in a glass container and left in a constant temperature and humidity chamber at 20° C. (75% R, H) for one week.

The test results were taken as the average of the amount of feeding damage and the number of deaths for the five tested specimens.

The test results are shown in Table 1.

Table 1 [Effects of the Invention] The cinnamic acid of the present invention is a strong insect repellent and has excellent insect repellent properties even in small amounts, and its effect persists for a long period of time.

Since it has properties as an insect repellent for lichens, it is expected to be an excellent insect repellent to replace conventional insect repellents.

Claims (1)

[Claims] An insect repellent containing 3-phenyl-2-propenoic acid as an active ingredient.