MXPA97008178A - Pillow to combat the polil - Google Patents

Abstract

For the fight against tissue-damaging animals, a moth-killing pad containing a finally divided support material impregnated with the active insecticide in a gas-permeable bag is described.

Description

Pad to combat moths DESCRIPTION OF THE INVENTION The present invention relates to an article, in the form of a pad, for combating moths. To combat moths, flat, cellulose-based compositions are used, for example, as paper, which are impregnated with an insecticidal active substance. Such mothproof papers are hung in the wardrobe where they fight the moths that eventually reach it by the progressive delivery of the active substance to the enclosed space. In such flat designs, it is disadvantageous that the evaporation rate at the beginning of use, in correspondence with the initial concentration gradient, is very high and attenuated in the course of time so that, on the one hand, the duration of the The activity of the mothproof paper is limited and, on the other hand, in order to guarantee an acceptable duration of activity, the impregnated must be highly concentrated to such an extent that, in many cases, the dose delivered until the fall of the same under the limits of activity is overdosed. It is now proposed, according to the invention, to use as a support material for the insecticide a material REF: 25820 of finely divided sop with a large surface for the evaporation of the insecticide and to pack it in a gas-permeable bag. Accordingly, the object of the present invention is a moth-fighting pad containing a finely divided carrier material impregnated with an insecticide within a gas permeable bag.

The pad for combating moths according to the invention has a large surface area for the insecticide and a large evaporation surface of the finely divided support material and a relatively small area, in comparison with the latter, in the form of a gas-permeable bag. for the exchange of the insecticide with the environment. The evaporation of the insecticide is carried out from the surface of the particles of the support material to the interstitial spaces between the particles which, due to the packing of the particles exhibit only a small gaseous exchange with the environment. The rate of evaporation is limited by the saturation with insecticide evaporated from the interstitial space between the particles, so that the initial overdosage observed in the flat antifouling paper does not take place. According to this, with the pad for combating the moths according to the invention a very regular delivery of the active substance is achieved and for a very long period of time.

Preferably, the pad for combating the moths according to the invention hangs in the wardrobe, next to the hangers, between the garments. Another effect of the pad for combating moths according to the invention is now that qu3, in the case of the movement of the pad to combat the moths, for example when removing or hanging garments, a forced exchange of the atmosphere takes place in the inside of the pad to fight moths, highly saturated with active substance, with the environment. By this, a temporary underdosing of insecticidal active substance in the wardrobe is compensated for by the gas exchange each time it is opened. Suitable finely divided support materials are the organic and inorganic support materials mentioned, for example, in EP-B 279 325, page 5, lines 55 to 59, such as kaolins, clays, talc, chalk, quartz, attapulgite, montmorillonite, diatomaceous earth, high dispersion silicic acid, aluminum oxide, silicates, calcite, marble, pumice stone, sepiolite, dolomite, sawdust, coconut shell, corn panicles and tobacco stems. The particle sizes of the support materials should preferably be in the range of 0, 1 to 2 mm, particularly preferably in the range of 0.3 to 1.5 mm. Also suitable are natural and synthetic, swellable mineral materials, known as slow-release compositions, predominantly with crosslinked structure in layers such as those disclosed, for example, in EP-B-90992 and EP-A 541 358. Suitable insecticidal active substances are those with a sufficiently high vapor pressure at room temperature, such as, for example, esters of phosphoric acid: dichlorvos (DDVP), fenitrothion, malathion, chlorpyrifor, diazinon, methyropyrimiphos; carbamates: propoxur, carbofuran, carbaryl and bendiocarb; and pyrethroids: cyfluthrin, tetramethrin, allethrin, vaportrin, tetralethrin, bioresmethrin, esbiol, cypermethrin, alphamethrin, decis, permethrin, transfluthrin and combinations thereof. As the active substance, transfluthrin is especially preferred, with a vapor pressure of about 4 '10' * mbar at 202 ° C. As support materials, cellulose-based support materials, such as, for example, cotton in the form of cotton twine or folded cotton fabrics, torn paper and many others are especially preferred. Especially preferred is sawdust, especially as used in the paper industry. Fabric bags, gauze or non-woven paper are suitable as fabric bags. For the production of the pads for combating the moths according to the invention, the support materials are impregnated with the active substance, preferably dissolved in a solvent, and then filled with the corresponding bag which is then closed by sewing. or stuck. Suitable solvents are alcohols such as ethanol, propanol and isopropanol, ethers of ethylene glycol such as ethylene glycol butyl ether and propylene glycol ethers such as propylene glycol butyl ether; in addition, ketones such as acetone; superior ketones such as methyl ethyl ketone and methyl isobutyl ketone. For the best control of the regularity of the application of the active substance on the support material, the active substance solution can be colored with a suitable dye. It is suitable, for example, Sudanblau 670, obtainable at BASF AG, Ludwigshafen. It is also possible to subsequently load the active substance solution, with an injection syringe for example, into the closed bag containing the support material. Finally, the active substance solution can also be applied from the outside onto the bag in which, after hermetic packaging, it is distributed during the usual transport and storage times. The preferred support material according to the invention is sawdust. The types of sawdust available are especially preferred for use in the paper industry. In any case it was found that sawdust, in the usual available form, is only a suitable support material with the use of isopropanol as a solvent. After a drying cabinet treatment at 1202C during the night, other outstanding solvents are also obtained in the fight against moths. The effect refers to the water content of the sawdust. Because of the joint action of the water content with a series of solvents, the sawdust evidently tends to swell with which the active substance dissolved in the solvent is enclosed in the sawdust, so that it can no longer be evaporated from the surface of sawdust. The use of sawdust as a support material therefore requires the prior drying of the sawdust, preferably up to a moisture content below 2%, particularly preferably below 0.5%. However, according to the invention, preferably sawdust is used in combination with isopropanol as a solvent for the active substance since, in this case, the moisture contents usually present under the conditions of delivery for sawdust, between 15 and 20 % by weight, do not lead to a reduction in the activity of the moth pads according to the invention.

According to the invention, it is possible to guarantee, with an application of 40 to 100 mg of transfluthrin per 3 volume of cabinet and year, the absence of damage to the garments. For this, the gas-permeable surface of the bag of the moth-proof pad, through which the delivery of the active substance to the atmosphere of the cabinet is effected, should amount to about 40 to 70 cm: per m3 of volume of closet. For other active substances, depending on the activity and vapor pressure of the active substance at room temperature, other values for the measures of the moth pad arise, if necessary. The atmosphere in the interstitial spaces between the particles of the carrier material remain saturated, more or less regularly, practically up to the total consumption of the active substance, so that the delivery of the active substance through the bag also remains approximately constant. EXAMPLES As a support material, a sawdust was used, which can be obtained under the designation LIGNOCELL "in the firm J. Rettenmeier und Sohne (Rosenberg-Holzmühle, BRD) .The sawdust exhibits a particle size distribution of 97% by weight < 1 , 5 mm and 3% <0.6 mm Sawdust exhibits, under delivery conditions, a water content of approximately 17% by weight. 6 g portions were weighed each. A fraction of the sawdust portions was dried, so that the residual moisture content amounted to less than 0.5% by weight, respectively. Active substance solutions were prepared using the solvents acetone, propylene glycol-n-butyl ether (PnB) or isopropanol, with 10.6% by weight of transfluthrin respectively. 0.24 ml of a solution of active substance was added to each portion of sawdust and mixed intimately with it. Next, gauze bags were filled with the portions and the bags were closed. For the activity test, larvae of Tineola bisselliella L2.3 clothing moths were used as test species, as well as larvae of the atagenus piceus L3-6 skins. Test enclosures of dimensions 625 mm deep were used as the environment for the test, 523 mm wide and 1699 mm high, corresponding to a volume of 0,555 m3. The cabinets are divided at half height by a board in such a way that a gap of 180 mm wide makes possible an exchange of air between the upper and lower halves. 30 mm below the cabinet cover is arranged in the center, parallel to the opening, a rod on which hangers for clothes can be hung. An anti-moth pad was hung in the center of the pole. To the left and right of the moth pad material was hung on the hangers, so that it was not in contact with the moth pad. The material consisted of a woolen cloth (100% wool). For control, a cabinet without an anti-moth pad was installed. For the first time a week after hanging the moth pad and then weekly or at intervals of several weeks - as indicated in the corresponding tables - the test species were placed on pieces of material of size 5 x 5 cm and were placed in the cupboards on the table, at half height. The larvae of moths and skins were evaluated by the action of abatement and the material by the sites or holes. The results are represented in the following tables Table 1 Species tested: Tincóla bisscllicll.i I,,. Active substance: 25 mg tic Iraiislluinn per 0,555 ni 'Temperature: 25 to 28"C, relative air humidity 38 to 68%.

Evaluation: Higher data: 100% killed, after days (d) or% of losses tlepu s of 13 days.

Lower data: Intensity of gnawing. R = I to 4 sites gnawed R + = > 5 sites roídos s l ?. = without l.nllti7gos lulíli i Tested species: Altagenus piceus E, "Active substance: 25 mg of transfliilrin per 0,555 m 'Tempeirability: 25 to 28" C, relative humidity of air 38 to 68%.

Evaluation: Higher data: 100% killed, after days (d) or% after the 13 days.

Lower data: Intensity of gnawing: R = I to 4 silos and ears R + = > 5 royed sites s.h. = without finding / uos It is noted that, in relation to this date, the best method known to the applicant to carry out the aforementioned invention is that which is clear from the present description of the invention. Having described the invention as above, property is claimed as contained in the following:

Claims (5)

1. CLAIMS 1. AlpchE- -Ll-the tasting ca-ta -ir the moths, ca-act-a-? Za-fa pap-μe -ptiepe, inside a gas permeable bag, a support material with a specific surface of 0 , 05 to 10 cm2 / g impregnated with an insecticide, the insecticidal active substance exhibiting a vapor pressure of at least 10"6 millibars 2. The pad to combat the moths according to reLvip-tica 1, < nH- ijri ized pa-oj-e se ß? p-tea fwrín a-po pe-betiaL ds support 3. Almohadi l la to combat the polillas according to the j-eiv-ip-tj-c ------ No 1 or 2, c --- ra-? A-i2a-fa p * -rr¡? * Is abbreviated OC? D irwRrtick-b the active substance transflutrin 4. Procedure for the production of a moth-proof pad according to one of claims 1 to 3, characterized in that a support material with a specific surface area of 0.05 to 10 cm2 / g is impregnated with the solution of an insecticidal active substance, the vapor pressure of the insecticidal active substance rising, I m At 10"6 millibars, a gas permeable bag is filled with the impregnated support material and the gas permeable bag is closed. Method for the production of a pad for combating moths according to one of claims 1 to 3, characterized in that a gas-permeable bag is filled with a carrier material with a specific surface area of 0.05 to 10 cm2 / g. . the bag is closed and the support material is impregnated with the solution of an insecticidal active substance. Process according to one of claims 4 or 5, characterized in that sawdust is used as the support material and isopropanol is used as the solvent for the insecticidal active substance. Process according to one of claims 4 or 5, characterized in that sawdust with a residual humidity of less than 2% by weight is used as the support material.