JPH11227851A - Ptp lid member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lid member for a molded container which is excellent in the generation preventive effect for static electricity, and wherein broken pieces of the lid member are prevented from dropping when a content sticks out, for a PTP lid member of which a plastic sheet is used. SOLUTION: For this PTP lid member for which at least a heat sealant layer 5, moisture-proof layer 2 and a base material sheet 1 are laminated in order, this lid member 10 is constituted in such a manner that the heat sealant layer 5 or the moisture-proof layer 2 contains polythiophene 3, and also, on the base material sheet 1, half-cut parts 6 are provided. Then, the base material sheet has a deposited layer of metal aluminum, or aluminum oxide, or a silicon oxide.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press-through pack (hereinafter, referred to as "PTP") for storing a solid substance such as a medicine, a candy and the like, and relates to a PTP cover made of a material mainly composed of plastic. Belongs to wood.

[0002]

2. Description of the Related Art Conventionally, tablets such as solid pharmaceuticals,
PTP such as candy is filled into the bottom material formed of a plastic sheet, and the lid material that seals it is usually made of metal aluminum foil coated with a heat seal layer on one side and a corrosion-resistant layer on the other side. It had been. As for the thickness of the metal aluminum foil, a relatively thick one having a thickness of 15 to 30 μm has been used in the case of PTP, compared to a thickness of 7 to 9 μm used for imparting ordinary moisture proofness. Metal aluminum foil prevents deterioration of contents,
Not only does it have a barrier property to prevent the intrusion of water vapor or oxygen, and prevents the effective components of the contents from diffusing, but it is also easily broken by piercing and has excellent properties for taking out the contents. However, there is a problem that metallic aluminum requires a large amount of electric power for its production, is expensive, and it is difficult to treat ash generated in large quantities when incinerating waste. Further, there is also a problem that when pushing out the contents from the bottom material side, the metal aluminum foil is broken and falls off simultaneously with the contents and is pushed out, thereby causing accidental drinking. From the above-mentioned problem, a lid member made of a plastic sheet having a small amount of ash by incineration has been studied. For example, it is as disclosed in JP-A-5-161692, JP-A-6-39015 and JP-A-7-17561. However, plastic sheets are apt to generate static electricity due to their materials, and therefore have problems such as quality changes of the contents due to discharge during discharge, falling off from a fixed position, and adhesion of foreign substances such as dust to the packaging material. Was.

[0003] As a method of suppressing the generation of static electricity, carbon black is kneaded into a plastic material of the sheet, or a paint containing carbon black is applied to the sheet. A surfactant or an ionic antistatic agent is kneaded into the plastic material of the sheet, or is coated on the surface of the sheet. A paint containing a powder of metal or metal oxide such as aluminum, copper, tin oxide, zinc oxide, titanium oxide, antimony oxide, and indium oxide is applied to the sheet. However, when using carbon black,
Since the appearance is black and the contents cannot be visually recognized, it is shunned from packaging materials such as pharmaceuticals. Further, those using the above surfactant have a problem that the antistatic effect is reduced in a low humidity environment. If the metal powder is not used, the metal powder does not exhibit an antistatic effect unless it is used in a large amount, and it is opaque and the contents cannot be visually recognized, its dispersibility is poor, and the cost is high. There were difficulties.

[0004]

The above-mentioned PTP lid material using a plastic sheet has poor appearance such as black color, unrecognizable contents, humidity dependency of antistatic property, It is an object of the present invention to solve the problems of breakage / dropout and high cost.

[0005]

In order to solve the above problems, the present invention provides at least a heat sealant layer (hereinafter referred to as a heat sealant layer).
Described as HS layer. ) And a moisture-proof layer and a base material sheet, in which the heat sealant layer or the moisture-proof layer contains polythiophene. The base sheet is a PTP lid member made of a plastic sheet and having a half cut portion for punching out with a tablet. Further, the base sheet is a PTP lid material having a deposited layer of metal aluminum, aluminum oxide, or silicon oxide.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION A PTP cover material of the present invention is a PTP cover material 10 in which at least an HS layer 5, a moisture-proof layer 2 and a base sheet 1 are sequentially laminated as shown in FIGS. And the PTP lid 10 including the HS layer 5 or the polythiophene 3 in the moisture-proof layer 2. The base sheet 1 is a PTP lid 10 made of a plastic sheet and having a half cut portion 6 for punching out with a tablet. Further, as shown in FIG. 3, the base sheet 1 is a PTP lid 10 having a deposited layer 21 made of metal aluminum, aluminum oxide, or silicon oxide.

The base sheet of the PTP cover material constituting the present invention is made of polyester such as polyethylene terephthalate or polyethylene naphthalate, polyolefin such as polypropylene, polyamide such as nylon 6 or nylon 66, polyvinyl chloride, polycarbonate, polystyrene, or the like. It can be formed of a uniaxially or biaxially stretched sheet such as an acrylic resin mainly containing methyl methacrylate. A stretched sheet in which a break is easily propagated by piercing, which is a property required for the lid material of the PTP of the present invention, can be preferably used. The thickness is preferably in the range of 10 to 100 µm, though it depends on the rigidity of the base sheet. When the thickness is 10 μm or less, workability is reduced, and barrier properties required for the cover material are inferior. On the other hand, when the thickness exceeds 100 μm, not only is the material wasted, but also its stiffness makes it difficult for puncture to propagate, thereby impairing the function of the PTP of extruding the contents.

The PTP lid material of the present invention is made of a metal or metal oxide or an inorganic compound as shown in FIG. 3 on both sides or one side of the base sheet 1, preferably on the side laminated with the moisture-proof layer 2. The ultra-thin layer (deposition layer 21) can be formed by vacuum deposition, sputtering, or CVD (chemical vapor deposition). And the vapor deposition layer 21 can compensate for the shortage of the barrier property which is a drawback of the plastic sheet. Examples of usable metals or metal oxides and inorganic compounds include aluminum, aluminum oxide, and silicon oxide. The desired barrier property can be exhibited in the thickness range of 100 to 1000 °.

The base sheet must be provided with a half cut as PTP so that the content is easily broken when the contents are inserted. The shape of the half-cut is preferably such that the contents can be taken out by piercing, and at the same time, the broken plastic sheet does not fall off and fall off. As shown in FIG. 4, a linear cut portion is formed in a half-cut shape, for example, a linear shape, an arc shape, a curved shape, a folded line shape, a crossed line shape, a cross shape, or a parallel line shape that is close to the extent that it does not touch. It is provided at the position.
The length of one half cut composed of the above linear cuts is preferably close to the diameter of the content, and is 2
It consists of 10 mm to 10 mm half cuts, and the total length of the half cuts is 5 to 20 mm depending on the size of the contents. Then, both ends of one cut line are formed of open areas in a non-contact state as shown in FIG. Also,
The half-cut part is not only composed of a single line, but also crossed by a plurality of half-cuts, formed in a cross shape, or in a curved shape, but in any case, the ends of the cut lines of the half-cut part are Are configured in a non-contact manner. Therefore, when a half cut is formed or the content is extruded from the PTP, a closed region is formed by a closed straight line or a closed curve, and no broken debris is generated. And, the pitch of the half cut portion is 1 / of the concave shape of the bottom material.
2, it is possible to form at least one desired half-cut portion for one recess.

[0010] The half-cut portion of the present invention can be formed by a straight line, a curve, an intersection line, or a combination thereof. The content can be easily passed by setting the length of the half-cut portion to 2 to 10 mm. However, it goes without saying that it can be arbitrarily changed depending on the size of the contents. The central angle when the half cut portion is formed in a partial arc shape is set to an obtuse angle of 180 degrees or less,
The contents can be easily extruded, and the falling off of the debris can be reduced.

In order to facilitate the passage of the contents of the PTP, for example, a half-cut portion combining the half-cut shapes shown in FIG. 4 can be formed. For example, FIG.
(a), a semicircle as shown in (b), a partial arc as shown in (c) (sharp central angle), a partial arc as shown in (d) (obtuse central angle), and as shown in (e) Corrugated, cross-shaped as shown in (f), scissors as shown in (g) (angle of 90 °), scissors as shown in (h) (angle of obtuse), non-contact two as shown in (i) Linear,
(j) Non-parallel linear type (angle at the intersection is acute), (k)
Non-parallel straight line (the angle of intersection is obtuse), (l) Semicircular end curve addition type, (m) Scissor end curve addition type, one cut line using straight line or curve Alternatively, a combination of a plurality of half cuts can be applied. In any case, it is preferable to take care that the ends of the same half cut do not contact each other to form a closed area by a closed straight line or a closed curve. Further, it is preferable that the linear distance between the non-contact between the start point and the end point of the line segment is 0.5 to 3 mm.
If it is 0.5 mm or less, it is difficult to take out the contents due to instantaneous protrusion, which may cause breakage debris.

In addition, the form of the half cut may be an alphabetic character, an arithmetic numeral, or a kana character. For example, (C, E, F, H, I, J, K,
L, M, N, S, T, U, V, W, X, Y, Z, 1,
There is no closed area consisting of a closed straight line or a closed curve such as (2, 3, 5, 7) or (i. .
On the other hand, (A, B, D, O, P, Q, R, 4,
6, 8, 9) or (ha, ho, nu, ru ...), etc., which have a closed area portion composed of a closed straight line or a closed curve, may cause sheet scraps during half-cut processing, or may have a PTP. It is not preferable to use the present invention in order to extrude the contents from crushed wastes. Manufacturers and contents can also be displayed by using a combination of these characters and figures.

The half-cut portion can be formed after laminating the base sheet and the moisture-proof layer or before laminating the moisture-proof layer using only the base sheet. The machining is preferably performed by a laser capable of adjusting the cutting depth with high precision, in addition to the tooth having the tooth shape. For example, when a carbon dioxide gas laser is used, polyethylene that hardly absorbs the carbon dioxide gas laser is laminated, and a penetrating portion by half-cutting can be provided only on a substrate sheet made of polyethylene terephthalate or nylon.

The lamination of the base sheet 1 and the moisture-proof layer 2 is performed by providing an adhesive layer 4 as shown in FIGS. 1 to 3 and dry laminating the film to be a moisture-proof layer. The base sheet is provided with a primer layer (anchor layer) by coating instead of the adhesive layer, and the plastic to be the moisture-proof layer is melt-extruded and coated (extrusion lamination), or a solution or dispersion of the moisture-proof material Or by coating. The moisture-proof material can also serve as the HS layer depending on its characteristics and the type of the bottom material of the PTP.

Materials that can be used for the adhesive layer or the primer layer include a lacquer-type adhesive obtained by dissolving a polyether / polyisocyanate, polyester, or epoxy-based adhesive in a solvent, and a so-called non-sol-type adhesive containing no solvent. This is performed using a material having a thickness of 2 to 10 μm (dry thickness). In addition, for example, the primer layer of the base sheet used for the melt extrusion coating is provided with a solution of polyethyleneimine, polybutadiene, an organic titanium compound, isocyanate, polyurethane or the like with a thickness of 0.1 to 2 μm to perform a primer treatment. Further, when the base sheet and / or the film of the moisture-proof layer used for lamination are subjected to corona discharge treatment or ozone treatment and the moisture-proof layer is extrusion-coated, the adhesion between the base sheet and the moisture-proof layer can be strengthened.

The thermoplastic resin used for the moisture-proof layer is selected from those having barrier properties such as moisture-proof properties and low piercing strength. For example, lamination of a film of low-density polyethylene, polypropylene or the like via an adhesive layer, or melting and extrusion coating of a moisture-proof layer directly on a base sheet (not shown) or via a primer layer corresponding to the adhesive layer (not shown). The moisture-proof layer can be composed of a multi-layer coextrusion coat, a wax coat (hot melt coat), or the like. Then, it is preferable that a corona discharge treatment is performed on the side of the moisture-proof layer on which the HS layer is provided, in order to strengthen the adhesion with the HS layer.

The application of the HS layer of the present invention is determined by the properties of the coating liquid such as the viscosity of the coating liquid, the fluidity and the drying property, and the properties such as the heat resistance of the base sheet (on which the moisture-proof layer is laminated). Can be Then, in order to stabilize the coating amount, gravure intaglio is used. When it is not desired that the gravure screen lines are embodied on the coated surface, a roll coating method is employed. When the coating surface needs to be smoothed, a reverse coat or an air knife coat is used. HS
The coating amount of the layer is preferably a dry thickness of 0.5 to 10 μm, and when less than 0.5 μm, there is uneven peel strength,
On the other hand, when the thickness exceeds 10 μm, the amount of heat required for heat sealing becomes large, and the heat sealing temperature becomes high, thereby lowering productivity and wasting material.

The HS layer of the present invention has a temperature of 22 ° C. and a relative humidity of 40.
Surface resistivity measured by the% conditions of 10 ⁵ ~10 ¹² Ω /
□ range, 23 ± 5 ° C, relative humidity 12 ± 3%
Under the following conditions, it has excellent static electricity characteristics in which the charge decay time from 5000 V to 99% decay is 2 seconds or less. If the above surface resistivity exceeds 10 ¹² Ω / □, the effect of electrostatic diffusion is extremely deteriorated, and problems such as adhesion of foreign matter may occur.

The lid material of the present invention can be used by selecting an HS layer so that it can be heat-sealed to a bottom material formed from a sheet made of polypropylene, polycarbonate, polystyrene, polyester, polyvinyl chloride or ABS. The thickness of the bottom sheet is 50 to 300 μm, although it is determined by the material to be used, the film forming method, the filling amount of the contents, the storage period, and the like. In addition, the sheet used for the bottom material may contain polythiophene or a layer containing polythiophene may be formed by coating.

The polythiophene mixed in the moisture-proof layer and / or the HS layer is obtained by polymerizing polydialkoxythiophene represented by the formula 1 in the presence of a polyanion.

[0021]

Embedded image

Wherein R ₁ and R ₂ are H or C ₁ -C ₄
Represents an alkyl group of
_A C ₁ -C ₄ alkylene group, preferably a methylene group which can be optionally substituted, an ethylene group, a propylene group, or a 1,2, which may be substituted with a C ₁ -C ₁₂ alkyl or phenyl group;
-A dispersion of polythiophene representing cyclohexylene groups. Representative examples of the C ₁ -C ₁₂ alkylene which R ₁ and R ₂ can form simultaneously or are formed include α-olefins such as ethene, propene, 1-hexene, 1-octene, 1-decene , 1-dodecene and 1,2-alkadienes derived from 1,2-dibromoalkane, and other 1,2-cyclohexadienes,
Preferred R ₁ and R ₂ such as 3-butadiene and 2,3- {methyl-2,3-butylene and 2,3-pentadiene are methylene, ethylene, α-propylene,
Particularly, ethylene can be preferably used.

The polyanion is a polymeric carboxylic acid, such as polyacrylic acid, polymethacrylic acid, or polymaleic acid, or a polymeric sulfonic acid, such as polystyrene sulfonic acid or polyvinyl sulfonic acid. The polymer carboxylic acid or polymer sulfonic acid can be a copolymer of vinyl carboxylic acid or vinyl sulfonic acid with another polymerizable monomer such as acrylate, methacrylate, or styrene. The molecular weight of the polymeric acid that provides the anion ranges from 1000 to 100,000, preferably from 2000 to 50,000. And it is marketed as a high molecular acid or its alkali salt.

As the polyanion to be present when polymerizing the polydialkoxythiophene used in the present invention, a mixture of a free carboxylic acid and / or an alkali salt of the corresponding acid can be used.

The cover material obtained by adding the above polythiophene to the moisture-proof layer and / or the HS layer laminated on the base sheet of the PTP cover material is colorless and transparent,
Its surface resistance can be set to 10 ¹² Ω / □, and it has characteristics that its conductivity does not decrease with time.

When the HS layer containing polythiophene is formed by coating, the HS layer is applied to the moisture-proof layer provided on the base sheet in a wound state where an easy adhesion treatment such as a corona discharge treatment is performed, if necessary. The coating method depends on the viscosity and drying property of the coating solution, but is conventionally known according to the properties of the coating and the amount of coating by roll coating, gravure coating, bar coating, air knife coating, extrusion coating, etc. The method can be used. The HS layer can also be formed via a primer layer that strengthens the adhesion to the moisture-proof layer.

The polythiophene used in the present invention can be provided not only on the moisture-proof layer and the HS layer but also on the moisture-proof layer side of the base sheet 1.

The resin composition (dispersion medium, vehicle) for forming the HS layer in which the polythiophene is dispersed is selected from those having good heat sealing properties (heat welding properties) with the bottom material. Those mainly composed of thermoplastic resin include linear polyester, polyurethane, acrylic resin, polyvinyl butyral,
There are polyamide, vinyl chloride / vinyl acetate copolymer, chlorinated polypropylene, ethylene / vinyl acetate copolymer, ethylene / acrylic acid copolymer, ethylene / acrylic ester copolymer, and ionomer. Also, rosin,
A resin obtained by mixing rosin-modified maleic acid resin, rosin-modified phenol resin, their ester with glycene or pentaerythritol, and dissolving or dispersing them in an appropriate solvent is used. The polythiophene is added in an amount of 0.1 to 100 parts by weight of the HS layer or the resin composition forming the same.
It is used by adding at a ratio of 01 to 100 parts by weight.

Hereinafter, the present invention will be described in more detail with reference to examples.

EXAMPLES (Examples 1 to 3) As shown in FIG.
A urethane-based primer layer (corresponding to the adhesive layer 4) is applied to the corona discharge-treated surface of a 5 μm biaxially stretched polyethylene terephthalate sheet (base sheet 1) to form a 20 μm thick moisture-proof layer 2 made of low-density polyethylene. Was formed by melt extrusion coating. In addition, a corona discharge treatment was performed on the side of the moisture-proof layer that was in contact with the HS layer during melt extrusion coating. Further, a cross-shaped half-cut portion 6 as shown in FIG. 4F was provided on the base material sheet 1 using a carbon dioxide laser. Next, a coating solution containing a polythiophene having a composition shown in Table 1 was adjusted to a concentration of 6% with a diluting solution, and air-knife coating was applied to the surface of the moisture-proof layer 4 for 5 minutes.
g / m ² to form an HS layer 5, and
P lid material 10 was created.

[0030]

[Table 1] The amounts of the resin composition and Baytron P are based on the weight of the solid content. The ratio between Baytron P and the resin composition in the coating solution was adjusted to be 5/1. However, * 1: Finetex ES-850 (solid content 30%) manufactured by Dainippon Ink and Chemicals, Inc. * 2: Neocryl A-6555 (solid content 40%) manufactured by Zeneca Corporation * 3: S-656 chlorine Polypropylene (solid content 30%) Nippon Paper Industries Co., Ltd.

(Embodiment 4) As shown in FIG.
A 5-μm biaxially stretched polyethylene terephthalate sheet (base sheet 1) was coated with a urethane-based primer layer (corresponding to the adhesive layer 4) on the corona-discharge treated surface, and polythiophene 3 was added to 100 parts by weight of low-density polyethylene.
Was formed by melt-extrusion coating. In addition, a corona discharge treatment was performed on the side of the moisture-proof layer that was in contact with the HS layer during melt extrusion coating. Furthermore, a cross-shaped half-cut portion 6 shown in FIG. 4F was provided on the base sheet 1 using a carbon dioxide laser.
Next, an ethylene / vinyl acetate copolymer emulsion (Aquatex MC-3800, manufactured by Chuo Rika Co., Ltd.)
(Trade name) was applied by air knife coating, and the HS layer 5 was formed by providing 5 g / m ^{2 on} the surface of the moisture-proof layer 4 to prepare the PTP lid 10 of Example 4.

(Embodiment 5) In the same manner as in Embodiment 1, H
Only the S layer is made of a heat-sealing resin (CMPS V201).
Melt extrusion coating at 230 ° C. was performed in place of a composition obtained by mixing 30 parts by weight (solid content) of polythiophene with 100 parts by weight of Mitsui DuPont Polychemical Co., Ltd. to form an HS layer 5 having a thickness of 15 μm. PTP of Example 5
Lid material 10 was prepared.

(Example 6) In the same manner as in Example 1, a PTP lid material 10 of Example 6 was prepared, in which only the base sheet 1 was provided and a 25 μm-thick polyethylene terephthalate sheet was provided with a vapor-deposited layer 21 of silicon oxide. did.

The following items were evaluated for the samples prepared in the examples. Surface resistance The surface of the HS layer of the sample left for 24 hours under conditions of 22 ° C. and 40% relative humidity is measured using a resistivity meter (MCP-HT260 manufactured by Mitsubishi Chemical Corporation). Total light transmittance Each sample is measured according to (JIS K7105 Plastic Optical Property Test Method (1) General Optical Properties 5.5 Light Transmittance and Total Light Reflectance). Haze value Each sample is measured according to (JIS K7105 Plastic Optical Property Test Method (2) Special Optical Properties 6.4 Haze (Haze)). Heat seal strength (HS strength) Polyvinyl chloride sheet of 250 μm thickness and H of each sample
The S layer and the S layer were heat-sealed under the heat-sealing conditions of 150 ° C., 3 kg / cm ² , and 0.5 seconds, and the peel strength at a width of 15 mm was measured according to the test method of (JIS Z1707 7.5 Heat-sealing strength). I do. (Below)

Table 2 shows the evaluations performed on the PTP lid materials of Examples 1 to 6.

[Table 2] * 1 Surface resistivity of the mixed layer (moisture-proof layer) of polyethylene and thiophene

[0036]

As described in detail above, the P of the present invention
Since the TP lid material uses a plastic sheet, the ash generated in the incineration process is small, and the polythiophene that does not inhibit the transparency is mixed in the HS layer and the moisture-proof layer.
The lid material is transparent and allows the contents to be visually recognized, and at the same time, prevents the attachment of foreign matter due to static electricity, and can constitute a lid material that prevents the generation of broken chips of the lid material when the contents are pushed out. And
The reduction in barrier properties due to the provision of the half-cut
It can be covered by laminating a moisture-proof layer.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view of a lid material including a polythiophene in an HS layer of the present invention.

FIG. 2 is a schematic cross-sectional view of a lid material in which polythiophene is contained in a moisture-proof layer of the present invention.

FIG. 3 is a schematic cross-sectional view of a cover material showing a form in which a deposition layer is provided on a base sheet.

FIG. 4 is a diagram illustrating an example of a planar shape of a half cut portion provided in a base sheet.

[Description of Signs] 1 Base sheet 2 Moisture-proof layer 3 Polythiophene 4 Adhesive layer 5 HS layer 6 Half cut section 10 Lid material 21 Deposition layer

Claims (3)

[Claims] 1. A lid material for a molded container in which at least a heat sealant layer, a moisture-proof layer, and a base sheet are laminated in order, wherein the heat sealant layer or the moisture-proof layer contains polythiophene. . 2. The PTP cover material according to claim 1, wherein the base sheet is made of a plastic sheet and has a half-cut portion for punching with a tablet. 3. The PTP cover material according to claim 1, wherein the base sheet has a deposited layer of aluminum metal, aluminum oxide, or silicon oxide.