GB2130883A

GB2130883A - Insecticidal mat for electric fumigator

Info

Publication number: GB2130883A
Application number: GB08331281A
Authority: GB
Inventors: Tadahiro Matsunaga; Kiyofumi Yoshida; Shigenori Tsuda; Goro Shinjo
Original assignee: Sumitomo Chemical Co Ltd
Current assignee: Sumitomo Chemical Co Ltd
Priority date: 1982-12-03
Filing date: 1983-11-23
Publication date: 1984-06-13
Also published as: FR2536958A1; HK97185A; GB8331281D0; IT1167043B; IT8323963A0; AR241065A2; JPH0559082B2; AR241065A1; KR840006748A; FR2536958B1; GB2130883B; PH18837A; AU555368B2; MY8600350A; JPS59104303A; GR78770B; AU2162383A

Abstract

This invention relates to a fibrous mat for electric fumigator having a particular size which contains a high concentration of pyrethroidal insecticide, and the mat is put on an electric heater so that impregnated insecticide may be vaporized to effectively kill not only mosquitos, but also other harmful insects.

Description

SPECIFICATION Insecticidal mat for electric fumigator This invention relates to an insecticidal composition for electric fumigator. More particularly, this relates to a fibrous mat of 1-1.25 m/m in thickness and 5-15 cm2 in surface area containing a high concentration of insecticide which is obtained by impregnating a mat with a premix composition comprising pyrethroidal insecticides, stabilizers, colorants and the other necessary in amount of 75-300 mg.

Heretofore, so called mosquito coils have been conventionally used to exterminate mosquitos mainly at homes. Recently the conventional mosquito coil is improved to be a new device, called electric fumigator, which consists of the combination of an electric heater and a molded fumigant, generally called a mosquito mat, to be put on the heater for vaporizing insecticidal ingredients contained therein.

The special terminologies and the background knowledge related to thereinabove are explained in such literatures as British Patents 1288138 and 1587396 issued to this applicant.

Now, the electric fumigator, represented by the electric mosquito exterminator, is commonly used as well as the mosquito coil and the insecticidal aerosol. However, the electric mat available now aims only at mosquitos as its representative common name indicates.

Lately, in areas of the poultry house, livestock shed, dump disposal, flies are often bred in swarm and fly to residential zone located in the vicinities thereof. Therefore it is desired to apply, on a continuous basis, effective measures to deal with a nuisance caused by not only mosquitos, but also flies and other vermin.

After the studies to satisfy such a requirement, the present inventors have found that a sufficient amount of active ingredients can be vaporized in the air and kept in an effective concentration over a long period of time by means of heating the mat having the above-mentioned features to a temperature between 1 400C and 1 800 C, thereby exterminating the flying insects such as flies, mosquitos, and in addition, the crawling insects and the like such as cockroach, flea, bedbug and other vermin.

The pyrethroidal insecticides as the active ingredients of this invention may, for example, be any of the following compounds:- Common Name Chemical Nomenclature (1) Allenthrins (R,S)-3-allyl-2-methyl-4-oxocyclopent-2-en-1 -yl (1 R,S,)-cis.trans-chrysanthemate (hereinafter described as Pynamin), and its optical or its geometrical isomers, or mixtures thereof; for instance, (R,S)-3-allyl-2-methyl -4-oxocyclopent-2-en-1 -yl (1 R)-cis.trans-chrysanthemate (hereinafter, Pynamin Forte), (R,S)-3-al lyl-2-methyl-4-oxocyclopent-2-en- 1 -yl (1 R)-trans-chrysanthemate (hereinafter, BAL), (S)-3-allyl-2-methyl-4-oxocyclopent-2-en-1 -yl (1 R)-trans chrysanthemate (hereinafter, S-biol), (2) Prallethrins (R,S)-2-methyl-3-(2-propynyl)-4-oxocyclopent-2-en-1 -yl (1 R,S)-cis.trans- chrysanthemate (hereinafter, S--4068), and its optical or its geometrical isomers or mixtures thereof; for instance, (R,S)-2-methyl-3-(2-propynyl)-4-oxocyclopent-2-en- 1 -yl (1 R)-cis-trans- chrysanthemate (hereinafter, S-4068F), (S)-2-methyl-3-(2-propynyi)-4-oxocyclopent-2-en- 1 -yl (1 R)-trans chrysanthemate (hereinafter, S-4068-d-T), (S)-2-methyl-3-(2-propynyl)-4-oxocyclopent-2-en- 1 -yl (1 R)-cis.trans- chrysanthemate (hereinafter, S-4068SF), (3) Resmethrins 5-benzyl-3-furylmethyl (1 R,S)-cis.trans-chrysanthemate (hereinafter, Chrysron), and its optical or its geometrical isomers or mixtures thereof; for instance, 5-benzyl-3-furylmethyl (1 R)-cis.trans-chrysanthemate (hereinafter, Chrysron Forte), 5-benzyl-3-furylmethyl (1 R)-trans-chrysanthemate (hereinafter, Chrysron-d-T), (4) Others 3-phenoxybenzyl (1 R)-cis-trans-chrysanthemate (hereinafter, Sumithrin), (R,S)-accyano-3-phenoxybenzyl (1 R)-cis.trans-chrysanthemate (hereinafter, S-2703F), (R,S)-3-allyl-2-methyl-4-oxocyclopent-2-en- 1 -yl 2,2,3,3 tetramethylcyclopropanecarboxylate (hereinafter, Knockthrin).

And an appropriate amount of these pyrethroidal insecticides to impregnate is in the range between 60 mg and 1 60 mg per piece of mat. Examples of suitable phenolic stabilizers are, for instance, in the following; 2 ,2'-methylene-bis(6-tert-butyl-4-methylphenol) (hereinafter, described as the stabilizer 1), 2,2'-methylene-bis(6-tert-butyl-4-ethylphenol) (hereinafter, the stabilizer 11), 4,4'-methylene-bis(2,6-di-tert-butylphenol) (hereinafter, the stabilizer Ill).

4,4'-butylidene-bis(6-tert-butyl-3-methylphenol) (hereinafter, the stabilizer IV), 4,4'-thio-bis(6-tert-butyl-3-methylphenol) (hereinafter, the stabilizer V).

In addition, colorants; for instance, allylamino anthraquinone, 1 ,4-diisopropylamino anthraquinone, 1 ,4-diamino anthraquinone, 1 4-dibutylamino anthraquinone, 1 -amino-4-anilino anthraquinone, and suitable incense or fragrance and/or additives to lower the viscosity and to ease the impregnation, such as, minor amount of myristic acid isopropyl ester, palmitic acid isopropyl ester, lauryl acid hexyl ester, and other aliphatic acid esters, kerosene and other organic solvents may be added in preparing a premix for a mat.

Then, a fibrous plate of 1-1.25 m/m in thickness and 5-15 cm2 in surface area is impregnated with the premix consisting of the above mentioned components, thereby a mat of this invention is obtained. If necessary, the premix may further be diluted with aliphatic ester, kerosene and the like as mentioned above before the impregnation. The fibrous plate in this invention may, for example, be the cotton lint plate, the plate consisting of the mixture of cotton lint and woodpulp, or any other absorptive plate.

In the following, this invention will be explained by examples relating to preparation of the fibrous mat of this invention containing a high concentration of insecticide and insecticidal effects thereof.

Hereinafter, part is by weight.

EXAMPLE 1 80 parts of Pynamin, Pynamin Forte, BAL or S-biol, 10 parts of the stabilizer 1, 0.5 part of 1 amino-4-anilino anthraquinone and 9.5 parts of myristic acid isopropyl ester are admixed to be a premix for mat. Then 1 50 mg of the premix is impregnated into a cotton lint plate of 1.14 m/m in thickness and 7.7 cm2 in surface area. Thus mats of this invention are prepared.

EXAMPLE 2 80 parts of Pynamin, Pynamin Forte, BAL or S-biol, 5 parts of the stabilizer 1, 0.2 part of 1-amino- 4-anilino anthraquinone, 5.0 parts of Fragrance RS-7882 (fragrance: a product of Takasago Koryo Co.) and 9.8 parts of myristic acid isopropyl ester are admixed to be a premix for mat Then 150 mg of the premix is, similarly to the foregoing example, impregnated into a plate. Thus mats of this invention are prepared.

EXAMPLE 3 40 parts of S--4068, S--4068F or S-4068-d-T, 5.0 parts of the stabilizer 1, 0.3 part of 1amino-4-anilino anthraquinone and 54.7 parts of myristic acid isopropyl ester are admixed to be a premix for mat. Then 1 50 mg of the premix is, similarly to the examples above, impregnated into a plate.

Thus mats of this invention are prepared.

EXAMPLE 4 The same procedures in the preparation of the premix according to the Example 3 are repeated with the exceptions that the amount of the stabilizer I is 10 parts instead of 5 parts, and that myristic acid isopropyl ester is 49.7 parts instead of 54.7 parts. Thus mats of this invention are prepared.

EXAMPLE 5 40 parts of S--4068, S-4068F or S-4068-d-T, 7.0 parts of the stabilizer 1, 0.3 part of 1 amino-4-anilino anthraquinone, 5.0 parts of Fragrance RS-7836 (fragrance: a product of Takasago Koryo Co.) and 47.7 parts of myristic acid isopropyl ester are admixed to be a premix for mat. Then 200 mg of the premix is impregnated into a plate, similar to examples above. Thus mats of this invention are prepared.

EXAMPLE 6 80 parts of S--4068, S-4068F, S-4068-d-T or S--4068SF, 10 parts of the stabilizer 11, 0.3 part of 1 -amino-4-anilino anthraquinone, and 9.7 parts of palmitic acid isopropyl ester are admixed to be a premix for mat. Then the premix is diluted twice with myristic acid isopropyl ester and 1 50 mg of the diluted premix solution is, similarly to examples above, impregnated to a plate. Thus mats of this invention are prepared.

EXAMPLE 7 A premix according to the Example 6 is diluted 1.25 times with kerosene. 100 mg of the diluted premix solution is impregnated to a plate, similarly to examples above. Thus mats of this invention are prepared.

EXAMPLE 8 60 parts of Pynamin, Pynamin Forte, BAL or S-biol, 20 parts of Sumithrin, 10 parts of the stabilizer 111, 0.5 part of 1 -amino-4-anilino anthraquinone and 9.5 parts of myristic acid isopropyl ester are admixed to be a premix for mat. Then 100 mg of the premix is impregnated to a pulp plate of 1.14 m/m in thickness and 5.0 cm2 in surface area. Thus mats of this invention are prepared.

EXAMPLE 9 40 parts of S--4068, S-4068F or S-4068-d-T, 10 parts of Chrysron Forte, 10 parts of the stabilizer IV, 0.5 part of 1 -amino-4-anilino anthraquinone and 39.5 parts of lauryl acid hexyl ester are admixed to be a premix for mat. Then 1 50 mg of the premix is impregnated to a pulp plate of 1.14 m/m in thickness and 7.7 cm2 in surface area. Thus mats of this invention are prepared.

EXAMPLE 10 70 parts of Pynamin, Pynamin Forte, BAL or S-biol, 10 parts of S-2703F, 10 parts of the stabilizer V, 0.5 part of 1 -amino-4-anilino anthraquinone and 9.5 parts of myristic acid isopropyl ester are admixed to be a premix for mat. Then 1 50 mg of the premix is impregnated to a plate similar to the Example 9. Thus mats of this invention are prepared.

EXAMPLE 11 70 parts of S--4068, S--4068F or S--4068-d-T, 10 parts of S--2703F, 10 parts of the stabilizer 1, 0.5 part of 1-amino-4-anilino anthraquinone and 9.5 parts of myristic acid isopropyl ester are admixed to be a premix for mat. Then the premix is diluted twice with kerosene and 300 mg of the diluted premix solution is impregnated to a pulp plate of 1.14 m/m in thickness and 1 5 cm2 in surface area. Thus mats of this invention are prepared.

EXAMPLE 12 40 parts of Pynamin, Pynamin Forte, BAL or S-biol, 40 parts of Knockthrin, 10 parts of the stabilizer 1, 0.5 part of 1 -amino-4-anilino anthraquinone and 9.5 parts of palmitic acid isopropyl ester are admixed to be a premix for mat. Then 200 mg of the premix is impregnated to a pulp plate of 1.14 rn/m in thickness and 7.7 cm2 in surface area. Thus mats of this invention are prepared.

EXAMPLE 13 The same procedures in the preparation of a mat according to the Example 1 are repeated with the exception that a plate of 1.2 m/m in thickness and 7.7 cm2 in surface are is used as a plate. Thus mats of this invention are prepared.

TEST EXAMPLE 1 Two premixes of Pynamin Forte and of S-4068F were prepared in the same manner as in the Example 1 and the Example 3 respectively. Then the premixes or the diluted solutions thereof with kerosene were made to soak in an amount which corresponds to the quantity of active ingredient as shown in the Table 1 into two kinds of cotton lint plates, one: 1.14 m/m in thickness and 7.7 cm2 in surface area (hereinafter referred to as "mat A") and the other obtained in the market: 2.8 m/m in thickness and 7.7 cm2 in surface area (hereinafter referred to as "mat B").

The fumigation test was conducted by putting each mat on a heater for an electric mosquito exterminator available in the market and by heating the mat up to 1 600C. Then, vaporized active ingredient was collected with a glass-made gas trap packed with silica gel. The amounts of active ingredient trapped therein was determined to calculate the vaporization ratio with the initial amount of active ingredient. Results are shown in the Table 1.

TABLE 1

vaporization ratio with time (%) active initial with time (%) used ingre- amount after after after after mat dient (mg/mat) 2 hrs 4 hrs 6 hrs 8 hrs Pynamin 120 22.4 47.5 68.1 81.8 Forte "mat A'' ~ S-4068F 60 26.3 54.0 71.9 81.3 Pynamin 40 22.9 46.5 62.4 74.7 Forte 120 10.8 21.8 33.5 43.8 "mat B" 20 33.6 48.6 68.4 87.1 S-4068F 60 8.2 18.8 27.2 37.4 TEST EXAMPLE 2 Into a glass chamber (0.34 m3) were liberated 20 flies and 20 mosquitos. A mat containing Pynamin Forte or S-4068F in an amount as shown in the Table 2, which was prepared by the method described in the Example 1 or 3 respectively, was placed on the same kind of heater as used in the Test Example 1 in the draft chamber, and heated for 1 5 minutes. Subsequently, the mat was transferred in the test chamber with the heater, and heated continuously. And the number of knocked-down insects was counted at certain intervals for 20 minutes to calculate the time required for 50% of insects to be knocked-down (KT-50) by the Finny's graphic method.

And then, all insects under test were transferred into a cage for observation and given water and food. After 24 hours, the dead were counted to calculate the mortality. Results are shown in the Table 2.

TABLE 2

amount of active KT-50 (min.)-mortality (%) active ingredient ingredient (mg/mat) fly mosquito Pynamin 120 6.41--61.8 1.77-76.1 Forte S 4068F 60 6.17-73.2 2.03-97.4 TEST EXAMPLE 3 The 100 flies and 100 mosquitos were liberated in a chamber having 28 m3, wherein a mat containing Pynamin Forte as active ingredient, obtained in the Example 1, was heated continuously on the same kind of heater as used in the Test Example 1 at 1 600 C. Then, the number of knocked-down insects was counted at intervals as shown in the Table 3.

All insects under test were transferred after 8 hours into a cage for observation and given food and water. After 24 hours, the dead were counted to calculate the mortality. Results are shown in the Table 3.

TABLE 3

knockedRown ratio (%) after after after after after after after after insect 15 j 30 45 1 2 4 6 8 mortality test min. min. min. i hr hrs hrs hn hn (%) fly 1 59 82 98 100 100 100 100 100 mosquito 28 1 92 100 100 100 1 100 100 100 100 TEST EXAMPLE 4 Three pieces of glass cylinders measuring 20 cm of the inner diameter and 20 cm of the height were piled, one on top of another, to form a cylinder of 60 cm in height, where the middle cylinder was in advance covered or blocked at its both ends with a 16 mesh Nylon-made net.

Twenty German cockroaches (common species) were released into the middle cylinder and a mat containing Pynamin Forte as active ingredient obtained in the Example 1 was put on the same kind of heater as used in the Test Example 1 which was set in the bottom area of the piled cylinder, followed by continuous heating. Then the number of knocked-down insects was counted at intervals as shown in the Table 4 to count the knocked-down ratio.

All insects were transferred after 8 hours into a cage for observation and given food and water.

After 72 hours, the dead were counted to calculate the mortality. Results are shown in the Table 4.

TABLE 4

amount knocked-down (%) of active active after after after after after after after after after ingredient 30 40 50 60 90 120 180 240 480 mortality (mg/mat) min. min. min. min. min. min. min. min. min. (%) 120 10.0 52.5 80.0 82.5 100 100 100 100 100 100

Claims

1. A fibrous mat for use in an electric fumigator which is 1 to 1.25 mm thick and has a surface area of 5 to 15 cm2 and is impregnated with a premix composition comprising at least one pyrethroidal insecticide, stabilizer and colorant in an amount of 75 to 300 mg per mat.

2. A fibrous mat according to claim 1, which further comprises fragrance and/or additives in the premix composition.

3. A fibrous mat according to claim 1 or 2, which contains an allethrin or a mixture thereof with another pyrethroidal insecticide in an amount of 80 to 160 mg per mat as the pyrethroidal insecticide.

4. A fibrous mat according to claim 1 or 2, which contains a prallethrin or a mixture thereof with another pyrethroidal insecticide in an amount of 60 to 80 mg per mat as the pyrethroidal insecticide.

5. A fibrous mat according to claim 1,2, 3 or 4, wherein the mat is 1.14 mm thick and has a surface area of 7.7 cm2.

6. A fibrous mat according to claim 1 substantially as described by reference to any one of Examples 1 to 13.

7. An electric fumigator containing a fibrous mat as claimed in any one of the preceding claims.