JPH0241121Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a liquid active substance-containing preparation, in particular,
The present invention relates to a liquid active substance-containing preparation which is easy to apply during its application.

In recent years, as a pest control method that does not cause environmental pollution, so-called mass-mass treatment has been developed, in which preparations containing insect sex pheromone are sprayed outdoors, and the pheromone is released into the atmosphere to attract insects to traps and kill them. - Trapping methods and so-called disturbance methods that disrupt males' ability to sense females and engage in mating behavior are attracting attention.

As a typical example of a formulation for this purpose, conventionally, for example, a porous polymer substrate having continuous through-holes is impregnated and absorbed with a pheromone to form an active substance storage layer, which can be used to control the release of the liquid active substance. Sheet-like preparations encapsulated in polymer membranes are known.
However, the application of such preparations may involve simply spraying or
Alternatively, they are fixed to trees with strings, wires, etc., and it is particularly time-consuming to attach them to trees or supporting materials.

This invention was made in view of the above, and
The purpose of the present invention is to provide a sheet-like preparation containing a liquid active substance such as a pheromone, which can be easily attached to a tree or support material during application.

The present invention includes a porous polymer layer having a large number of independent micropores, and a liquid active substance that has limited solubility in the polymer at room temperature and is encapsulated as droplets in the micropores. This sheet-like preparation is characterized by having through-holes in the thickness direction and cutting portions extending from appropriate peripheral edges to the through-holes.

The sheet-like preparation as described above preferably comprises, for example, a polymer and an active substance that is liquid at room temperature and has limited solubility in the polymer at room temperature.
Both the active substance and the polymer are dissolved in an organic solvent that is both soluble and more volatile than the active substance, this solution is applied to the surface of a suitable support, the solvent is evaporated, and the above-mentioned It is manufactured by dispersing a liquid active substance in the form of minute droplets within a layer of polymer.

In the present invention, a liquid active substance refers to a substance that is liquid at room temperature and has chemical or physiological activities such as pesticide activity, attractant activity, repellent activity, and aromatic activity. Insecticides such as (Naled), Diazinon, Sumithion, fungicides such as β-propiolactone, repellents such as triethylene glycol monohexyl ether, N,N-diethyl-m-toluamide, dodecyl acetate, Z - Pheromones such as 11-tetradecenyl acetate and Z-11-hexadecenal or their analogues, limonene, benzyl alcohol, and aromatic active substances such as esters, ethers, and aldehydes derived from hydrocarbons having 6 to 16 carbon atoms. etc. can be mentioned.

The polymer constituting the porous polymer layer needs to have limited solubility for the liquid active substance used, and usually a polymer that dissolves only 5 parts by weight or less of the liquid active substance; In particular, 0.01~
A polymer that can be dissolved in an amount of 1 part by weight is preferably used. Such polymers are appropriately selected depending on the liquid active substance used, and specific examples include polysulfone, polycarbonate, polystyrene, poly(meth)acrylic acid ester including polymethyl methacrylate, polyamide, and polyvinylidene chloride. , polyvinylidene fluoride, cellulose ester, regenerated cellulose, polyurethane, polyvinyl alcohol, polyvinyl chloride, polyvinyl acetate, ethylene-vinyl acetate copolymer, vinyl chloride-vinyl acetate copolymer,
Examples include polystyrene-polybutadiene block copolymers and the like, or a mixture of two or more thereof.

In addition, the organic solvent used in manufacturing the preparation according to the present invention must be able to dissolve both the active substance and the polymer, be more volatile than the active substance, and have a lower boiling point. and the type of polymer, but specifically, for example, methylene chloride, chloroform,
Lower aliphatic halogenated hydrocarbons such as carbon tetrachloride,
In addition to lower aliphatic alcohols such as methanol and ethanol, and their acetate esters, one or a mixture of two or more of acetonitrile, acetone, ethyl ether, tetrahydrofuran, etc. can be used. In particular, lower aliphatic halogenated hydrocarbons such as methylene chloride are preferably used.

The concentration of the total amount of liquid active substance and polymer in the solution containing them is usually between 10 and 40% by weight.
is suitable, preferably 15 to 30% by weight.
After this solution is applied onto a suitable support such as a resin film, metal foil or thin sheet, or a laminate thereof, the organic solvent is removed by evaporation.

The temperature when evaporating the organic solvent is usually 0 to 0.
The temperature is 100°C, preferably in the range of 15 to 70°C, and below the boiling point of the solvent. Normally, it may be at room temperature, but it may be heated if necessary. Also,
It may also be evaporated under reduced pressure. In this way, as the organic solvent evaporates, a phase separation occurs between the active substance and the polymer, as the liquid active substance has only a limited solubility in the polymer, resulting in a loss of active substance. The tiny droplets are uniformly dispersed in the polymer matrix, so that the polymer forms a porous layer with a large number of independent micropores within which the liquid active substance is encapsulated. It will become. Normally, on the surface of a polymer, the concentration of the polymer increases as the solvent evaporates, and eventually a dense thin layer is formed that is integrated with the porous layer.
If the solvent is evaporated in a humidified atmosphere, a homogeneous porous membrane without a dense layer on the surface can usually be obtained.

In the sheet-like preparation obtained by this method, the micropores formed in the porous polymer layer are usually independent pores separated by partition walls with a thickness of 0.1 to 5 μm, and the pore diameter is 0.5 to 5 μm. It is about 10μ. In addition, since the porous polymer layer has a porosity of about 30 to 80%, it can contain up to about 70% by weight of the liquid active substance, but in practical terms, the maximum is about 50% by weight. is appropriate. Further, the thickness of the porous polymer layer is not limited in any way, but is usually in the range of 10 to 500μ.

In the above-mentioned sheet-like preparation, the liquid active substance encapsulated within the pores of the polymer layer has limited solubility in the polymer, so diffusion into the polymer is suppressed. Thus, the liquid active substance is released at a controlled rate so that release into the ambient atmosphere is limited.

The formulation according to the invention may have a backing on the back side of the porous polymer layer that does not allow the liquid active substance to diffuse through. For example, metal foil, thin sheet, resin film, laminates thereof, etc. are preferably used for the backing.

If necessary, a polymer film having a lower diffusivity for the liquid active substance than the polymer layer is laminated on the porous polymer layer to serve as a control layer for controlling the release rate of the active substance into the environment. be able to. Generally, a film made of polyethylene or polyethylene terephthalate is preferably used for such a control layer.

FIG. 1 is a sectional view of a main part showing an embodiment of a liquid active substance-containing preparation according to the present invention, in which a porous polymer layer 1 has a large number of independent micropores 2, and a liquid An active substance 3, for example a pheromone, is encapsulated. If necessary, a control layer 4 is provided on the front surface of the porous polymer layer, and a backing 8 is provided on the back surface. As shown in FIG. 2, the preparation of the present invention is cut into an appropriate shape, has a through hole 5 in the thickness direction, and has a cut portion connected to the through hole from an appropriate peripheral position. There is. The cut in the embodiment shown in FIG. 2 is simply a notch 6. According to this formulation, when attaching to a tree or support material, it is extremely easy to open the cut and insert the tree branch or support material into the through hole.

FIG. 3 shows another embodiment, in which the cut portion is formed in a notch 7 of a predetermined width that extends from the side peripheral edge position to the through hole 5. As shown in FIG. This formulation can also be easily installed in the same way as above.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part of one embodiment of the formulation according to the present invention, FIG. 2 is a perspective view of one embodiment of the formulation according to the present invention, and FIG. 3 is a perspective view of another embodiment. DESCRIPTION OF SYMBOLS 1... Porous polymer layer, 2... Micropore, 3... Liquid active substance, 5... Through hole, 6... Notch, 7...
...notch, 8...butsuking.

Claims (1)

[Scope of utility model registration request] A sheet-like sheet consisting of a porous polymer layer having a large number of independent micropores and a liquid active substance that has limited solubility in the polymer at room temperature and is encapsulated as droplets in the micropores. 1. A liquid active substance-containing preparation characterized by having a through hole in the thickness direction and having a cut portion connected to the through hole from an appropriate peripheral edge.