JPH0769804A - Chemical sustained release multilayer form - Google Patents

Abstract

PURPOSE:To prepare the subject multilayer form capable by peeping the sustained release of chemical contained therein over a long period of time. CONSTITUTION:This multilayer form has at least one tack agent layer containing a chemical agent and porous layer(s) provided on one or both surfaces thereof and barrier layer as the outermost layer impermeable for said chemical agent, and the chemical agent is releasable through the sides of the porous layer(s). The porous layer is e.g. paper, pulp, nonwoven fabric, wood, cloth, cotton linter, or a drawn porous form obtained by uniaxially or biaxially drawing by a factor of 1.1 to 10 a resin composition comprising 100 pts.wt. of a thermoplastic resin and 50-400 pts.wt. of a filler, its thickness being normally 30mum to 10mm. In the case that the final multilayer form is rectangular parallelopiped, it is preferable that the relationships: D/L<=0.1 and Sa/Sb<=1 be satisfied (Sb is the surface area of both of the obverse and reverse surfaces (cm<2>); L is the peripheral length of the obverse or reverse surface (cm); D is the thickness of the multilayer form other than the barrier layers (cm); and Sa is the exposed area on the sides (cm<2>)).

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a drug sustained-release multilayer body. More specifically, it relates to a drug sustained-release multilayer body capable of releasing a drug for a long period of time.

[0002]

2. Description of the Related Art Conventionally, a sustained-release form in which a drug is contained in a filter paper or a pressure-sensitive adhesive layer is known as a sustained-release form of a drug. However, these sustained-release forms have a large initial sustained release amount and are particularly volatile. When trying to release a highly active drug slowly, the drug is released within a short period of time, and it cannot be sustained over a long period of time in an amount suitable for producing the drug's effect. There was a problem.

[0003]

DISCLOSURE OF THE INVENTION The inventors of the present invention have conducted extensive studies to find a drug sustained-release body capable of sustaining a sustained release of an amount suitable for exerting the effects of the drug over a long period of time. It was As a result, a drug is mixed in the adhesive to form an adhesive layer containing the drug, and a porous body is laminated on at least one surface of the adhesive to form a multilayer body, and as an outermost layer of the multilayer body formed. It has been found that by laminating a barrier layer that does not allow drug penetration on both front and back surfaces, the drug contained in the adhesive is released only from the side surface of the porous layer, and the drug release is sustained over a very long period of time. Came to.

[0004]

That is, the present invention provides a multilayer body having at least one adhesive layer containing a drug and a porous layer provided in contact with at least one surface of the adhesive layer. And a drug-impermeable barrier layer provided as the outermost layer of the multilayer body, wherein the drug is released from the side surface of the porous layer. Is.

The drug to be used in the present invention is not particularly limited as long as it has a sustained release amount corresponding to the vapor pressure of the compound or active ingredient contained therein, and it can exert its drug efficacy or activity depending on the use situation, but is not particularly limited. Antifungal agents, repellents, bactericides, fragrances, rust preventives, essential oils obtained from plants, etc. are exemplified, and any of these agents can be arbitrarily selected and used alone or in combination of two or more. Can be used. Next, specific examples of the drug used in the present invention will be illustrated. Examples of the insect repellent include highly volatile agents such as empentrin. Examples of the antifungal agent include dehydroacetic acid, 4-isopropyl-m-cresol, allyl isothiocyanate and the like. Examples of the bactericide include cresol, resorcin, hinokitiol and the like. Examples of plant essential oils include cypress essential oil, hiba essential oil, moon peach essential oil, mustard extract oil, wasabi extract oil, and the like.

The pressure-sensitive adhesive forming the pressure-sensitive adhesive layer used in the present invention is not particularly limited as long as it can be mixed with a drug, and can be arbitrarily selected and used. Are, for example, acrylic resin-based or silicone resin-based adhesives, natural rubber, polyurethane, rubber adhesives such as polybutadiene, polyvinylpyrrolidone,
Vinyl-based adhesives such as polyvinyl acetate and cellulose-based adhesives such as ethyl cellulose and methyl cellulose are used.

As a method for forming a pressure-sensitive adhesive layer containing a drug, for example, both the drug and the pressure-sensitive adhesive are dissolved in a solvent having solubility for both the drug and the pressure-sensitive adhesive, and the solution is applied to the barrier layer or the porous layer. After that, a method of removing the solvent is used. The thickness of the pressure-sensitive adhesive layer can be appropriately adjusted depending on the required amount of drug and the like, but is usually 5 to 200.
μm is suitable.

The porous material used in the porous layer of the present invention is not particularly limited as long as it can hold the drug and release the drug from the side surface not covered by the barrier layer. Specific examples include paper, pulp sheet, non-woven fabric, cotton linter, wood, cloth, and the like, which can be used alone or in combination as the porous layer. In addition to this, as a porous layer suitable for the purpose of the present invention, 100 parts by weight of a thermoplastic resin and 50 to 400 parts by weight of a filler, or a resin composition containing a dispersant as necessary is extruded and then uniaxially or biaxially. A well-known porous film or sheet obtained by stretching in the direction may be mentioned. The thermoplastic resin is, for example, at least an α-olefin homopolymer such as low-density polyethylene, high-density polyethylene, polypropylene, or polybutene, or an α-olefin having 3 to 18 carbon atoms represented by linear low-density polyethylene. One α-olefin / ethylene copolymer, propylene / ethylene and / or butene-1 copolymer, ethylene / vinyl acetate and / or
Alternatively, a polyolefin resin such as a copolymer with an organic carboxylic acid derivative having an ethylenically unsaturated bond such as acrylic acid ester / methacrylic acid ester may be used. These may be used alone or in combination of two or more.

The barrier layer of the present invention is not particularly limited as long as it has a barrier property against a drug, and is usually polyester, nylon, polycarbonate,
A resin film or sheet such as polymethylmethacrylate, a metal foil such as an aluminum foil, a paper on which a metal such as aluminum is deposited, a resin film on which a metal such as aluminum is deposited, and the like are used.

The drug is released from the side surface of the porous layer.
Therefore, if the porous layer is too thin, drug release will generally occur.
Is too slow to obtain the required drug effect, and the porous layer
If it is too thick, it will not be possible to release the drug for a long time.
Therefore, the thickness is usually about 30 μm to 10 mm.
Furthermore, in the dimension of the drug sustained-release multilayer body of the present invention
Regarding the thickness of the layer that releases the drug, that is, the multilayer body,
The relationship between the thickness excluding the barrier layer and the surface area is constant.
When the conditions are satisfied, especially the desired sustained release of the drug
It lasts for a long time. For example, if the multi-layer body is a rectangular parallelepiped,
As shown in FIG. 1, the surface area of both front and back surfaces is Sb (c
m²), The perimeter of the front or back surface is L (cm), burr
Exposed area on the side and thickness of the multilayer body excluding the layer
Respectively D (cm) and Sa (cm ²),
Drug so that D / L ≦ 0.1 and Sa / Sb ≦ 1
It is desirable to determine the dimensions of the drug sustained release multilayer body.
Yes.

Examples of the drug sustained-release multilayer body of the present invention are shown in FIGS. 1 (A), 1 (B) and 1 (C). In (B), the porous layer 2 and the barrier layer 3 are adhered by the pressure-sensitive adhesive layer 1 containing a drug. In (C), the two porous layers 2 are adhered by the adhesive layer 1 containing the drug, and the respective porous layers 2 and barrier layers 3 are also adhered by the adhesive layer 1 containing the drug. Has been done. The drug sustained-release multilayer body (C) has a total of three drug-containing pressure-sensitive adhesive layers 1, and it is possible to contain different drugs in each layer.

[0012]

EFFECTS OF THE INVENTION The sustained release of a drug from the drug sustained release multilayer body lasts for a long period of time.

[0013]

The present invention will be described below with reference to examples.
The present invention is not limited to these examples. Example 1 Allyl isothiocyanate (Midori Cross Co., Ltd., trade name: Wasauro) and an acrylic resin adhesive were dissolved in chloroform, and the solution was uniformly applied to the aluminum side of the aluminum-deposited paper, and the chloroform was evaporated to a thickness. 20μ
m adhesive layer was obtained. The content of allyl isothiocyanate in this pressure-sensitive adhesive layer was 3300 mg / m ² . Separately, linear low-density polyethylene (Sumitomo Chemical Co., Ltd.
Product name: Sumikasen L FA201-0) 100 parts by weight and calcium carbonate (made by Shiraishi calcium, product name: Whiten SSB (red)) 120 parts by weight are kneaded and extruded to form a sheet, and then uniaxially stretched 4 times. By doing so, a porous layer having a thickness of 700 μm was obtained. Aluminum vapor-deposited paper coated with the above-mentioned pressure-sensitive adhesive was attached to both surfaces of the porous layer to obtain a drug sustained-release multilayer body. (Sa = 1.4 cm ² ,
Sb = 50 cm ² , Sa / Sb = 0.028, L = 20c
m, D = 0.07 cm, D / L = 0.0035) This multilayer body was cut into a size of 5 cm × 5 cm, and the temperature was 23 ° C.
Allyl isothiocyanate was released by suspending it in a room of No. 3, and the multilayered body was extracted in an acetone reflux at each lapse of time, and the amount of remaining allyl isothiocyanate was measured by gas chromatography. As shown in FIG. 2, it was found that allyl isothiocyanate remained in the multilayer for a long time, and the release of allyl isothiocyanate from the multilayer continued for a long time.

Example 2 A controlled drug release multilayer body was obtained in the same manner as in Example 1 except that a 35 μm thick film prepared in the same manner as the porous layer of Example 1 was used as the porous layer. . (Sa = 0.0
7 cm ² , Sb = 50 cm ² , Sa / Sb = 0.001
4, L = 20 cm, D = 0.0035 cm, D / L =
1.75 × 10 ⁻⁴ ) The release of allyl isothiocyanate from this multilayer is shown in FIG.
As shown in, it continued for a long time.

Example 3 A drug sustained-release multilayer body was obtained in the same manner as in Example 1 except that thick paper having a thickness of 350 μm was used as the porous layer.
^{(Sa = 0.7cm 2, Sb =} 50cm 2, Sa / Sb =
0.014, L = 20 cm, D = 0.035 cm, D /
L = 1.75 × 10 ⁻³ ) The release of allyl isothiocyanate from this multilayer is shown in FIG.
As shown in, it continued for a long time.

Example 4 A drug sustained-release multilayer body was obtained in the same manner as in Example 1 except that a pulp sheet having a thickness of 1 mm was used as the porous layer.
(Sa = 2 cm ² , Sb = 50 cm ² , Sa / Sb = 0.
04, L = 20 cm, D = 0.1 cm, D / L = 5 × 1
0 ^-3 ) The release of allyl isothiocyanate from this multilayer is shown in Figure 2.
As shown in, it continued for a long time.

Comparative Example 1 180 mg of allyl isothiocyanate (Midori Cross Co., Ltd.) was added to a 5 cm × 5 cm square filter paper (No. 526 paper chromatography filter paper manufactured by Toyo Roshi Kaisha, Ltd.) having a size of 5 cm × 5 cm and a thickness of 0.07 cm as a porous layer. (Product name: Wasauro) was impregnated by a short-time immersion, and the obtained drug sustained-release body was measured for the amount of allyl isothiocyanate volatilized under the same conditions as in Example 1. As shown in FIG. Moreover, the drug almost disappeared in 15 hours.

[Brief description of drawings]

FIG. 1A is a perspective view of a drug sustained-release multilayer body.
(B) shows a cross-sectional view of the drug sustained-release multilayer body. (C) is a cross-sectional view of a drug sustained-release multilayer body. In the drug sustained-release multilayer body, two porous layers are adhered by an adhesive layer containing a drug, and two porous layers are provided. The quality layer and the barrier layer are adhered by the adhesive layer containing the drug, and the total is 3
There are two drug-containing pressure-sensitive adhesive layers, and it is possible to contain different drugs in each drug-containing pressure-sensitive adhesive layer.

FIG. 2 is a graph showing the sustained release process of allyl isothiocyanate from the drug sustained-release multilayer bodies of Examples 1 to 4.

FIG. 3 is a graph showing the time-course of sustained release of allyl isothiocyanate from the drug sustained-release preparation of Comparative Example 1.

[Explanation of symbols]

Reference numeral 1 represents a pressure-sensitive adhesive layer containing a drug, 2 represents a porous layer, and 3 represents a barrier layer. Sb represents the sum of the areas of the front and back surfaces, D represents the thickness of the drug sustained-release multilayer body excluding the barrier layer, and Sa (= S1 + S2) is the side surface area of the drug sustained-release multilayer body excluding the barrier layer. Represents L (= L1 + L2) represents the perimeter of the front surface or the back surface of the drug sustained-release multilayer body.

Claims (4)

[Claims] 1. A barrier which is a multilayer body having at least one adhesive layer containing a drug and a porous layer provided in contact with at least one surface of the adhesive layer, and which is impermeable to the drug. A drug sustained-release multilayer body, wherein a layer is provided as the outermost layer of the multilayer body, and the drug is released from the side surface of the porous layer. 2. A stretched porous layer obtained by uniaxially or biaxially stretching a resin composition containing 100 parts by weight of a thermoplastic resin and 50 to 400 parts by weight of a filler 1.1 to 10 times. The drug sustained-release multilayer body according to claim 1, which is a layer comprising a body. 3. The porous layer comprises paper, pulp, nonwoven fabric, wood,
The drug sustained-release multilayer body according to claim 1, which is a layer made of a porous body selected from the group consisting of cloth and cotton linters. 4. The sum of the areas of the front and back surfaces is Sb (cm ² ), the perimeter of the front surface or the back surface is L (cm), the thickness of the multilayer body excluding the barrier layer of the drug and the exposed area on the side surface are D respectively. (Cm) and Sa (cm ² ), D /
L <0.1 and Sa / Sb <1. The drug sustained release multilayer body according to claim 1, 2 or 3.