JPH10291569A - Packaging material and packaging container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lessen the change and alteration of the taste, medical effect, and smell of an article to be packaged and prevent the decrease of medical effect of medicine containing iodine when it is preserved for a long time, by laminating polylactic acid layer composed of polylactic acid obtained by the polymerization of lactic acid at the inside face of a packaging material body. SOLUTION: Polylactic acid layers 1 are laminated at the inside of a packaging material body constituted of an aluminum foil layer 2, a synthetic resin film layer 3, adhesive layers 4, 5 for instance, to form this packaging material. The polylactic acid layer 1 can be obtained by chemically polimerizing L-lactic acid and/or D-lactic acid. Polylactic acid is shaped in advance to have a film- form in and these film sheets are laminated on the packaging material body to form the polylactic acid layer 1. The molecular weight as much as 150,000-250,000 is favorable in the formability and the melting point as high as 170-180 deg.C is preferable. Such a polylactic acid layer can be easily heat-sealed with heat and pressure and a packaging body or a packaging container with a favorable sealability can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention mainly relates to food and drink,
The present invention relates to a packaging material suitable for packaging or storing a medicine or a fragrance as an article to be packaged.

[0002]

2. Description of the Related Art Conventionally, various types of materials such as glass, metal, and synthetic resin have been used as packaging materials for packaging or storing items to be packaged such as foods and drinks and pharmaceuticals. In particular, a metal foil or a synthetic resin sheet having a heat sealing layer on the inner surface is useful because it can be easily packaged simply by packing the object to be packaged and heat sealing the edge of the package. ing. As the heat sealing layer used at this time, generally, a layer composed of a modified or unmodified polyolefin-based resin is often used.

By the way, foods and drinks (juice, tea, coffee, spices, chewing gum, candy, chocolate, etc.) and pharmaceuticals (happs, tablets, etc.) which are to be packaged contain a small amount of a large number of aroma components. Contained, thereby increasing its commercial value.
In the case of pharmaceuticals, such a fragrance component may have a pharmacological action (medicinal effect) in some cases. In addition, fragrances other than food and drink and pharmaceuticals, deodorants, detergents, bath additives, cosmetics, cleaning cloths,
A number of fragrance components are also contained in fragrances and pastes for the same purpose.

The following substances are known as such fragrance components. For example, p-menthane, pinene,
terpene-based hydrocarbon compounds such as d-limonene, myrcene, terpinene, carene, sapinene, and β-caryophyllene, geraniol, nerol, citronellal,
Terpene alcohol compounds such as terpineol, linalool, menthol, nerolidol, borneol or esters thereof, terpene aldehyde compounds such as citral and citronellal, alcohols such as octanol, benzyl alcohol, eugenol, ethyl caproate, benzoic acid Esters such as amyl esters and ethyl cinnamate, or many other organic compounds are known. Then, by combining a plurality of these flavor components, a unique flavor is imparted to the food / drink or pharmaceutical or the like.

[0005] Further, the form of iodine-containing preparations known as a kind of pharmaceuticals is mainly liquid or powder,
The package is generally housed in a brown glass bottle or a brown ampule. The reason why the brown glass bottle or ampoule is used is to provide the packaging container with a light barrier property so that the medicinal component of the stored iodine-containing preparation does not evaporate, decompose or deteriorate. However, glass bottles and ampoules have a drawback that they are difficult to dispose of because they may be broken. It is also conceivable to collect without disposal, but since the collection operation is complicated, consumers tend to not like it.

[0006] For this reason, in recent years, packaging of a powdery iodine-containing preparation with a packaging material in which an aluminum foil and a polyethylene film are laminated has been partially performed. The packaging form using this packaging material is to form a bag with a polyethylene film on the inner surface, store a powdery iodine-containing preparation in the bag, and heat seal the mouth of the bag by fusing the polyethylene film. It is. Therefore, this polyethylene film is used as a heat sealing layer of a packaging material. In such a packaging form, since the aluminum foil has a good light barrier property, it is possible to prevent external light from penetrating into the packaging, and to sufficiently prevent transpiration, decomposition or deterioration of the medicinal component of the iodine-containing preparation. It is thought that it can be prevented.

[0007] However, when the food or drink, medicine or the like containing the above-mentioned fragrance component is packaged in a metal foil or a synthetic resin sheet having a heat sealing layer, the fragrance component is sorbed to the heat sealing layer. was there. Further, when the iodine-containing preparation is packaged, iodine or potassium iodide as a medicinal ingredient sometimes sorbs to the heat sealing layer. In particular, when a heat sealing layer made of a generally used modified or unmodified polyolefin-based resin is employed, the sorption may be remarkable. When odor components are absorbed into the heat-sealing layer, the taste of foods and beverages is changed, and the taste of foods is reduced. However, in some cases, the commercial value of the product decreases. In addition, if the fragrance components and the like are sorbed to the heat sealing layer, the heat sealing layer is deteriorated or deteriorated, and the sealing property may be reduced. Particularly, when the packaged object is an aromatic or deodorant, During storage, there is also a drawback that fragrance components such as an aromatic component and a deodorant component (in the case of deodorization by masking, the deodorant component is often an aromatic component) leak out. Here, the sorption means that a fragrance component, iodine, or the like is dissolved and diffused in another material such as a heat sealing layer.

The sorption of the fragrance component by the heat sealing layer is as follows:
The degree of sorption (the amount of sorption) differs depending on the type of fragrance component. However, in the case of foods and drinks that are given a specific fragrance by combining a plurality of types of fragrance components, some fragrance components are large. When sorbed, the aroma of foods and drinks and pharmaceuticals changes, causing a change in taste and the like, and in any case, the commercial value thereof decreases. For example, as a resin constituting the heat sealing layer,
When polyolefin resins such as polypropylene, medium / low pressure process polyethylene, high pressure process polyethylene, and ethylene-vinyl acetate copolymer are used, among the above odor components,
The terpene-based hydrocarbon compounds are particularly strongly sorbed (the degree of sorption is large), but alcohol-based and ester-based odor components are not so sorbed (especially, alcohol-based odor components are hardly sorbed), and as fragrance components. When these mixtures are contained, the respective fragrance components lose their balance, the fragrance of foods and drinks and pharmaceuticals is altered, and the commercial value is reduced.

Further, such a decrease in commercial value due to the sorption of fragrance components and iodine occurs not only in packaging materials provided with a heat sealing layer but also in other packaging materials.
For example, when a material including a synthetic resin sheet is used as a packaging material, fragrance components, iodine, and the like are sorbed to the synthetic resin sheet, and the commercial value of the food, beverage, pharmaceutical, or the like to be packaged is reduced. There was also that. In addition, permeation and dissipation of the aroma components and iodine to the outside of the package can be sufficiently prevented by using a metal foil such as an aluminum foil or a material including a synthetic resin film having a high gas barrier property as a packaging material body. It is a good thing. However, it goes without saying that the sorption of fragrance components, iodine and the like into the packaging material (especially in the heat sealing layer) as described above cannot be prevented.

[0010] Under such circumstances, various materials for packaging materials in which fragrance components are difficult to sorb have been developed.
For example, it is known that polyethylene terephthalate, ethylene-vinyl copolymer or nylon is difficult to absorb odor components (Japanese Patent Application Laid-Open No. 57-163654,
JP-A-60-48344). It is also known that a mixture of a polyester and a polyamide is also difficult to sorb a fragrance component (Japanese Patent Application Laid-Open No. 61-64449). It is also known that an ethylene-vinyl alcohol copolymer is also difficult to sorb a fragrance component (JP-A-63-395).
No. 0). Further, it is known that such an ethylene-vinyl alcohol copolymer is used as a heat sealing layer of a packaging material (Japanese Utility Model Laid-Open No. 63-21031). As the ethylene-vinyl alcohol copolymer, those having a vinyl alcohol content of about 25 to 75 mol% are frequently used. This is because the vinyl alcohol content is 2
If it is less than 5 mol%, it is difficult to form a film having excellent gas barrier properties, and if it exceeds 75 mol%, it becomes difficult to form a film by extrusion molding.

However, such an ethylene-vinyl alcohol copolymer has a higher melting point than a modified or unmodified polyolefin-based resin, and is difficult to use as a heat sealing layer. In addition, each of the above-described resins other than the ethylene-vinyl alcohol copolymer has a much higher melting point than the modified or unmodified polyolefin-based resin,
It is not generally used as a heat sealing layer. It should be noted that there is no known material for packaging materials in which iodine or potassium iodide, which is the main medicinal component of the iodine-containing preparation, is difficult to sorb.

[0012]

SUMMARY OF THE INVENTION It is an object of the present invention to find a resin which does not easily absorb odor components, iodine or potassium iodide. Another object of the present invention is to find a resin which can be used as a constituent material of the heat sealing layer (although it need not be used as a constituent material of the heat sealing layer).

[0013]

The inventors of the present invention have conducted experiments using various materials. As a result, polylactic acid is suitable as a material that does not easily absorb odor components, iodine or potassium iodide. I discovered that. A layer made of polylactic acid has a property that it is difficult to sorb an aroma component or iodine or potassium iodide, which has not been known at all and has been discovered by the present inventors. . The present invention has been made based on such a finding. That is, the present invention relates to a packaging material characterized in that a polylactic acid layer is laminated on the inner surface of the packaging material body (the inner surface is the surface on the side of the article to be packaged).

The packaging material according to the present invention is obtained by laminating a packaging material body and a polylactic acid layer. The polylactic acid layer is obtained by polymerizing lactic acid (accurately, condensation polymerization or polycondensation, but here, it is simply referred to as polymerization; the same applies hereinafter). L-lactic acid and L-lactic acid are present as optical isomers in lactic acid, and any of them may be used in the present invention. Polylactic acid can be obtained by chemically polymerizing the L-lactic acid and / or D-lactic acid. Therefore, the polylactic acid in the present invention includes poly-L-lactic acid, poly-D-lactic acid, and L-lactic acid and D-lactic acid.
It includes those obtained by copolymerizing lactic acid with an arbitrary ratio. When forming a polylactic acid layer, each of the above-described polylactic acids may be used alone, or at least two or more kinds of polylactic acids may be mixed and used at an arbitrary ratio. In addition,
The structural formula of polylactic acid is represented by the following chemical formula 1.

[0015]

Embedded image

The molecular weight of the polylactic acid used in the present invention is not particularly limited. When polylactic acid is previously formed into a film form and laminated on the packaging material body to form a polylactic acid layer, it is necessary to use polylactic acid having a good film-forming property, in which case the molecular weight is 50, 0
It may be about 00 to 250,000, particularly preferably 15
It is good to be about 0000 to 250,000. Also, polylactic acid is dissolved in a solvent and used as a solution,
When this is applied to a packaging material body to form a polylactic acid layer, the molecular weight is preferably about 50,000 to 150,000. Further, when polylactic acid is heated and melted and laminated on the packaging material body by solventless extrusion coating to form a polylactic acid layer, the molecular weight is 100,00.
It is preferably about 0 to 200,000.

The melting point of the polylactic acid used in the present invention is not particularly limited. Generally, the melting point of polylactic acid is preferably about 170 to 180 ° C. When the melting point is at this level, heat sealing can be easily performed by applying heat and pressure during general heat sealing, and a package or a packaging container having good sealing properties can be obtained.

In order to form a polylactic acid film using polylactic acid, for example, the following method is used. That is, polylactic acid is put into an extruder, heated and melted, extruded from a T-die into a film, and quenched on the surface of a casting roll using a known casting method such as an electrostatic binning method. A substantially amorphous, non-oriented polylactic acid film is obtained. The film thus obtained is
It is an unstretched polylactic acid film, which may be used as it is as a layer constituting a packaging material. In particular, an unstretched polylactic acid film can be sealed at a relatively low heating temperature, and thus is suitable for use as a material for an inner lid whose main purpose is sealing. That is, when the packaging material is used as an inner lid for sealing the mouth of the container body of the packaging container, it is preferable to use a packaging material having an unstretched polylactic acid film layer.

The unstretched polylactic acid film is stretched 2 to 4 times in the longitudinal direction by a roll-type longitudinal stretching machine, and then stretched 3 to 5 times in the width direction by a tenter-type stretching machine.
After the obtained biaxially stretched polylactic acid film is subjected to a heat treatment as required, the film is gradually rolled up while being gradually cooled, whereby a biaxially stretched polylactic acid film can be obtained. In this case, a uniaxially stretched polylactic acid film may be used without stretching in the width direction. Stretched polylactic acid films such as the biaxially stretched polylactic acid film and the uniaxially stretched polylactic acid film are also used as layers constituting various packaging materials. Such a stretched polylactic acid film has relatively improved mechanical properties (particularly, tensile strength) in the machine direction or width direction, and even when a high tensile strength is applied when producing a packaging material, This is preferable because it is difficult to break.

Regarding the stretching ratio in the machine direction and the width direction,
The above example is merely an example, and any stretch ratio may be used. In general, the stretching ratio is preferably 1.5 times or more, particularly preferably 2 times or more, and most preferably 2.5 times or more in terms of area ratio. If the stretching ratio is less than 1.5 times the area ratio, the mechanical properties tend not to be sufficiently improved as compared with the unstretched polylactic acid film. In addition, the ability to prevent sorption of aroma components and the like tends to slightly decrease. On the other hand, the upper limit of the stretching ratio is generally preferably as high as possible, but it is generally reasonable to make it up to 30 times (area ratio) in terms of production. Further, since the polylactic acid film tends to improve transparency by being stretched, it can be suitably used as a material of a packaging material requiring transparency.

The method for producing an unstretched polylactic acid film or a stretched polylactic acid film described above is merely one example of the production of the polylactic acid film used in the present invention. The uniaxially stretched polylactic acid film or the biaxially stretched polylactic acid film can be obtained by another known method such as the method. That is, the unstretched polylactic acid film used in the present invention may be any method as long as it is a conventional unstretched film manufacturing method, and the stretched polylactic acid film used in the present invention may be a conventional stretched film. Any manufacturing method may be used.
For example, Japanese Patent Application Laid-Open Nos. 7-204401 and 7-3
No. 00520, JP-A-8-183895, JP-A-8-183899, JP-A-8-252895
And JP-A-8-283858.

The thickness of the polylactic acid layer such as the polylactic acid film used in the present invention can be arbitrarily determined, but is generally preferably from 5 to 2,000 μm.
More preferably, it is 1,000 μm.
Most preferably, it is μm. 5μ thick polylactic acid layer
To be less than m may be difficult in manufacturing. Also,
A material having a size exceeding 2,000 μm is often unsuitable as a material for a packaging material. The surface of the polylactic acid layer such as a polylactic acid film may be subjected to a surface treatment such as a corona treatment. By performing such a surface treatment, when printing or the like is performed on the surface of the polylactic acid layer, the riding of the printing ink is improved. In addition, when such a surface treatment is performed on at least one surface of the polylactic acid film (the surface to be laminated with the packaging material main body), the affinity with the adhesive is improved when the polylactic acid film is laminated and adhered to the packaging material main body. The adhesive strength between the packaging material body and the polylactic acid film is improved.

Although the polylactic acid layer is formed of polylactic acid, it may contain a small amount of a plasticizer or another resin as another component. As the plasticizer, a natural product such as starch is preferable, and as the other resin, aliphatic polyester or the like is used. In particular, when using the packaging material as an inner lid for sealing the mouth of the container body, it is preferable to use a plasticizer mixed in an unstretched polylactic acid film,
preferable. This is because the flowability of the unstretched polylactic acid film at the time of heat sealing is improved by the presence of the plasticizer, and the heat sealing becomes easy. In the present invention, a copolymer obtained by copolymerizing polylactic acid with another segment such as an aliphatic polyester may be used as the polylactic acid. Such polylactic acid can have a relatively low melting point (specifically, it can be arbitrarily adjusted in the range of 100 to 180 ° C.), and is easily sealed by heat. As a specific example of such a polylactic acid, a lactic acid-based copolymer (CPLA) manufactured by Dainippon Ink and Chemicals, Inc. can be used.

In the present invention, the packaging material body refers to a material obtained by removing the polylactic acid layer from the packaging material. Therefore, for example, when the packaging material is formed by bonding a synthetic resin film and a polylactic acid film with an adhesive, the packaging material includes the synthetic resin film and the adhesive. Packaging materials containing metal foil,
Products containing metal deposition films, products containing metal thin film layers, products containing metal molded products formed into a prescribed shape, products containing inorganic compound thin film layers, products containing synthetic resin films, products containing synthetic resin An arbitrary material such as a material containing a fiber layer, a material containing a fiber layer, or a material containing glass is employed.

It is preferable to use an aluminum foil having a thickness of about 6 to 20 μm as the metal foil. As the metal deposited film, it is preferable to use an aluminum deposited film having a thickness of about 500 to 1,000 angstroms. As the metal thin film layer, a metal thin film layer made of a metal or a metal oxide is used. As the inorganic compound-based thin film layer, a thin film layer made of an inorganic oxide is generally used. As the metal molded product, a commonly used aluminum can, steel can, or the like is used. Examples of the synthetic resin film include a polyolefin film such as a polyethylene film and a polypropylene film, a polyester film such as polyethylene terephthalate and polylactic acid, a polyvinyl chloride film, a polystyrene film, a polycarbonate film, and a polyamide film. And its thickness is preferably about 5 to 30 μm. As the synthetic resin molded product, a synthetic resin such as a polyolefin resin or a polyester resin molded into a generally used fixed shape such as a bottle shape, a press-through pack shape, a plastic bottle shape, or the like is used. As the fiber layer, knitted fabric,
Paper, nonwoven fabric and the like are used. In general, a glass-shaped glass is used.

The main body of the packaging material may be a composite of the various materials described above. For example, a laminate such as an aluminum foil / polyester film,
Laminates such as polyvinylidene chloride film / stretched nylon film, laminates such as stretched nylon film / aluminum foil / polyester film, laminates such as polypropylene film / polyvinyl alcohol film / polypropylene film, aluminum cans /
A laminate such as a polyester film may be used. In the case of a laminate, the laminate is often bonded and bonded using an arbitrary adhesive. In addition, the laminate may be bonded by a coating method or a lamination method without using an adhesive. When an adhesive is used, the thickness of the adhesive layer is 1 to 10 μm.
m is preferable.

The polylactic acid layer and the packaging material body are laminated to form a packaging material. For example, when the packaging material is laminated in the order of polylactic acid / adhesive / aluminum foil / adhesive / polyester film, the packaging material is:
It means that it is composed of the polylactic acid layer and the packaging material body below the adhesive. The polylactic acid layer is laminated on the inner surface of the packaging material body. Here, the inner surface refers to a surface located on the packaged object side. Therefore, the polylactic acid layer is located on the side of the package, and often comes into contact with the package.

The article to be packaged or housed by using the above-described packaging material may be any as long as it contains an aromatic component. In addition, any material containing iodine or potassium iodide may be used. Specifically, coffee, juice, tea, spices,
Sake, various sweets, curry, red beans, cooked rice, chewing gum, candy, chocolate and other foods and drinks, iodine-containing preparations, haptics, various tablets and other pharmaceuticals, detergents, bath additives, fragrances, deodorants, shampoos, rinses Cosmetics such as foundations, fragrances and the like, clean paper cloths such as clean cotton and wet tissue, paints, pastes and the like.

Specific examples of the case of packing or storing an article to be packaged by using such a packaging material include the following modes. When the packaging material is in the form of a sheet and the packaged material is used for individual packaging of chewing gum, candy, bath salt, etc., simply wrap the packaged material with the packaging material and bond a part of the folded piece. good. At this time, the polylactic acid layer is generally wrapped so as to be on the inner surface, that is, on the side of the article to be packaged. The polylactic acid layer has an excellent springback property depending on its type, and is suitable as a packaging material for individual packaging. That is, because the shape retention of the folded packaging material is good, it is easy to maintain the folded state,
It has excellent packaging. When the packaged material is liquid coffee, juice, shampoo, etc., or powdered coffee, juice, iodine-containing preparation, foundation, etc., the bag is formed using the packaging material and the bag is formed. After injecting the article to be packaged through the mouth, the mouth of the bag may be sealed by heat sealing. At this time, it goes without saying that a bag is formed such that the polylactic acid layer is on the inner surface, and the polylactic acid layer is sealed as a heat sealing layer. Further, when the packaging material is the inner lid, the polylactic acid layer of the packaging material may be brought into contact with the mouth of the container body, and may be sealed by heat.

Various design changes can be made to the packaging material according to the present invention depending on the type of the article to be packaged. For example, when the packaging material according to the present invention is used for an iodine-containing preparation, it is preferable that the packaging material body includes a layer having a light barrier property. This is because when light passes through the packaging material, the efficacy of the iodine-containing preparation decreases. As the layer having a light barrier property, a metal foil such as the above-described aluminum foil or a metal vapor-deposited layer such as an aluminum vapor-deposited layer can be used. Further, a layer formed by coating a brown ink can also be used. Such a layer has a brown color and does not easily transmit light, and is therefore preferably used as a material of a packaging material body for an iodine-containing preparation. Further, a coating layer of polyvinylidene chloride may be provided on the outer surface of the brown ink coating layer (the surface opposite to the surface on the side of the polylactic acid layer) in order to impart water vapor barrier properties and gas barrier properties. The brown ink coating layer can be easily formed by applying a paint in which the brown ink is dissolved or dispersed in a synthetic resin solution.

As a method for packaging an iodine-containing preparation,
The following methods are mentioned. For example, two quadrangular packaging materials are prepared, and the iodine-containing preparation is sandwiched between the two packaging materials such that the polylactic acid layers of the two packaging materials are in contact with each other. The iodine-containing preparation can be hermetically packaged by heat sealing each edge of the quadrilateral packaging material. In addition, two packaging materials are laminated so that the sides of the polylactic acid layer of the quadrilateral packaging material are in contact with each other, and the three edges are heat-sealed to form a bag, and the bag contains iodine. After the preparation is stored, the iodine-containing preparation can be hermetically sealed by heat sealing the mouth of the bag. It goes without saying that any other method may be used as long as the polylactic acid layer is inside the package in addition to such a method.

Further, the iodine-containing preparation may be packaged and stored in a bottle. That is, the bottle may include at least a polylactic acid layer formed in a predetermined bottle shape and a layer having a light barrier property laminated on the outer surface of the polylactic acid layer. As a specific example, a polylactic acid layer formed in a bottle shape and provided with an aluminum vapor-deposited layer on the outer surface may be mentioned.
Of course, a packaging material having an arbitrary layer configuration can be used in the form of a bottle. The iodine-containing preparation is stored in such a bottle. When a bottle-shaped packaging material is used, it is preferable to employ a material made of polylactic acid as a lid, a packing, and the like used for sealing the mouth of the bottle.

As the iodine-containing preparation, any preparation containing iodine, potassium iodide, or the like can be used, such as a liquid, a granular powder, or a liquid obtained by impregnating the liquid with absorbent cotton or a nonwoven fabric. But it is good. Representative examples of the iodine-containing preparation include a liquid iodine tincture or a powdery disinfectant.

The packaging material according to the present invention is also suitably used as an inner lid for sealing a mouth of a container body when packaging and storing an aromatic agent, a deodorant, and the like. The inner lid can be easily obtained by punching a sheet-shaped packaging material into a predetermined size. Needless to say, the predetermined size is slightly larger than the mouth of the container body. The inner lid has a heat sealing layer (polyester) on the end face of the container body (including the end face of the flange when the flange is formed in the mouth) of the container body in which the fragrance and the deodorant are stored. If heat and pressure are applied to the inner lid with the lactic acid layer being in contact with the inner lid, the heat sealing layer is melted and the inner lid is bonded to the mouth end surface. As described above, a product in which the fragrance, the deodorant, and the like are sealed can be obtained. For example, sealed fragrance and deodorant products are distributed, stored and sold in that state. When using the fragrance product or the deodorant product, the container body containing the fragrance or the deodorant may be placed at a desired place after the inner lid is peeled off.

The container body may be made of any material and may have any form. Generally, those made of a synthetic resin, and basically those having a cylindrical or conical shape are often used. Since an aromatic product, a deodorant product, and the like, which are superior in design, have higher commercial value, a synthetic resin that is easy to mold is used. In particular, it is preferable to use a polyester resin having excellent durability.

1 to 5 are diagrams schematically showing a cross section of a packaging material according to an example of the present invention. 1 is a polylactic acid layer, and 2 or less is a packaging material body. Specifically, 2 is an aluminum foil, 2 ′ is an aluminum vapor-deposited layer, 3 is a synthetic resin film layer, and 4 and 5 are each an adhesive layer.

Hereinafter, the present invention will be described specifically with reference to examples, but the scope of the present invention is not limited to these examples. When interpreting the scope of the present invention, the present invention has a polylactic acid layer, a property that it is difficult to sorb fragrance components,
Or, it should be interpreted on the basis that it is based on the discovery of a property that is difficult to sorb iodine or potassium iodide.

[0038]

【Example】

Example A-1 First, a 12 μm-thick polyethylene terephthalate film (PF2 manufactured by Nimura Chemical Co., Ltd.) was used as a packaging material body.
001) and an aluminum foil having a thickness of 9 μm were laminated and bonded with a polyester polyol / aliphatic isocyanate-based adhesive (Takeda Pharmaceutical Co., Ltd., Takelac A-515 / Takenate A-10) to form a two-layer structure. Got ready. On the other hand, as a polylactic acid layer, a stretched polylactic acid film obtained by the following method was prepared. That is, a polylactic acid having a melting point of 170 to 180 ° C. and a molecular weight of about 200,000 is heated and melted to form a film while being extruded from a T-die, and the film is doubled in the longitudinal direction.
The film was stretched at a stretch ratio of 3 times in the width direction to prepare a stretched polylactic acid film having a thickness of 20 μm. Then, the stretched polylactic acid film was laminated and adhered to the aluminum foil surface of the packaging material body by a dry lamination method using a polyester polyol / aliphatic isocyanate-based adhesive as an adhesive to obtain a packaging material. This packaging material is cut into a quadrilateral of a predetermined size, the two sheets are laminated so that the respective stretched polylactic acid films are in contact with each other, the three edges are heat-sealed, and the inner package is 130 mm × A 150 mm quadrilateral bag was prepared.

The following two types of solutions were prepared as articles to be packaged in this packaging material. (I) 100 cc of an ethanol solution containing 500 ppm of each of α-pinene, d-limonene and myrcene, which are aroma components contained in foods and drinks in a relatively large amount, was prepared. (Ii) Each of l-menthol, dl-camphor and methyl salicylate, which are fragrance components (also medicinal components) relatively large contained in pharmaceutical products such as haptics,
100 cc of an ethanol solution containing 00 ppm was prepared.
Then, the solution of (i) is stored in the three quadrilateral bags prepared in advance, and the solution of (ii) is stored in the three quadrilateral bags, and the mouth of each bag is heat-sealed. Six sealed packages were prepared.

This sealed package is stored under the condition of 23 ° C. × 65% RH. After 5 days, one sealed package in which the solution (i) is packaged and the solution (ii) are removed. Take out each solution of (i) and (ii) from one packaged sealed package, extract and concentrate each fragrance component remaining in each solution, and determine the quantity using gas chromatography. went. Then, the ratio (residual rate) of the content after 5 days to the initial content of each flavor component was calculated. Similarly, the survival rates after 10 days and after 30 days were calculated. These surviving rates are
The results are shown in Table 1. The residual rate is calculated by [(amount of fragrance component after day / amount of initial fragrance component)] × 100 and is expressed in percent (%).

[0041]

[Table 1]

Example A-2 As a packaging material body, a two-layer structure was prepared by depositing a 500-Å-thick aluminum vapor-deposited thin film on a 12-μm-thick polyethylene terephthalate film. On the other hand, as a stretched polylactic acid film as a polylactic acid layer, a stretched polylactic acid film obtained in the same manner as in Example 1 except that the thickness was 38 μm was prepared. And it carried out the test similarly to Example 1, and measured and calculated the residual ratio of each fragrance component. The results are shown in Table 1.

Comparative Example A-1 The procedure of Example 1 was repeated, except that a stretched polylactic acid film having a thickness of 20 μm was replaced with a polyethylene film having a thickness of 30 μm used as a heat-sealing film. The residual ratio of the fragrance component was measured and calculated. The results are shown in Table 1.

As is evident from the results in Table 1, a sealed package was obtained using the packaging materials according to Examples A-1 and A-2 in which the surface to be packaged was in contact with a layer made of a stretched polylactic acid film. It can be seen that the amount of each fragrance component contained in the packaged item hardly decreases even with the passage of time. In other words, it is understood that each fragrance component in the packaged material is difficult to sorb to the packaging material. On the other hand, when a sealed package is produced using the packaging material according to Comparative Example A-1 in which the surface to be packaged is in contact with the layer made of polyethylene, each fragrance component contained in the packaged product is obtained. It can be understood that the value of “は” is almost halved with the passage of time. That is, it is understood that approximately half of each flavor component in the packaged material is sorbed to the packaging material. Therefore, when packaging foods and drinks and pharmaceuticals containing various fragrance components using the packaging materials according to Examples A-1 and A-2, the taste of the food and drinks or the medicinal properties of the pharmaceuticals are hardly reduced. In contrast, Comparative Example A-
When packaging foods and drinks and pharmaceuticals using the packaging material according to 1, the taste of the foods and drinks, the medicinal properties of the pharmaceuticals, and the like are reduced.

Example B-1 First, a 12 μm-thick polyethylene terephthalate film (PF2001 manufactured by Nimura Chemical Co., Ltd.), a polyester polyol / aliphatic isocyanate-based adhesive (Takeda A-515 / Takenate A manufactured by Takeda Pharmaceutical Co., Ltd.)
-10), 9 μ thick aluminum foil, polyester polyol / aliphatic isocyanate-based adhesive (Takeda A-515 / Takenate A-, manufactured by Takeda Pharmaceutical Co., Ltd.)
10), a packaging material laminated in the order of a 25 μm-thick polylactic acid film (manufactured by Shimadzu Corporation) was prepared. The polylactic acid used here has a molecular weight of about 200,0.
00 and a melting point of about 170 to 180 ° C.

On the other hand, as an iodine-containing preparation, 140 mg of a powdery preparation having an effective iodine content of 3.86% was prepared.
Then, the packaging material is cut into a quadrilateral of a predetermined size, the two sheets are laminated so that the respective polylactic acid films are in contact with each other, the three edges are heat-sealed, and the inner package is 130 mm. A quadrilateral bag measuring 150 mm was prepared. After storing the above-mentioned powdery preparation in this bag, the mouth of the bag was heat-sealed with a polylactic acid film and sealed. Then, in this state, it was stored under an atmosphere of 40 ° C. for one month and three months, the effective iodine content of the powdery preparation was measured, and the medicinal component retention was calculated. The medicinal component retention (%) is calculated by (effective iodine content after storage / initial effective iodine content) × 100. Table 2 shows the retention rates of the medicinal components. In addition, in Table 2, as a remark, it was noted that it could be confirmed outside the medicinal component retention ratio.

[0047]

[Table 2]

Example B-2 A 20 μm-thick polylactic acid was laminated and integrated on one surface of a 9 μm-thick aluminum foil by a solventless extrusion coating method. Then, a polyethylene terephthalate film (Nimura) having a thickness of 12 μm was formed on the other surface of the aluminum foil via a polyester polyol / aliphatic isocyanate-based adhesive (Takelac A-515 / Takenate A-10, manufactured by Takeda Pharmaceutical Co., Ltd.). Chemical Co., Ltd. PF20
01) was laminated and integrated by a dry lamination method to obtain a packaging material. Therefore, this packaging material has a thickness of 1
A 2 μm polyethylene terephthalate film, a polyester polyol / aliphatic isocyanate adhesive, a 9 μm thick aluminum foil, and a 25 μm thick polylactic acid coating layer were laminated in this order. The polylactic acid used here had a molecular weight of about 150,000 and a melting point of about 170 to 180 ° C.

Example B-1 except that this packaging material was used
The retention rate of the pharmaceutically active ingredient was measured and calculated in the same manner as described above, and the results are shown in Table 2.

Example B-3 Polylactic acid having an inner volume of 60 cc, a total inner wall area of about 90 cm ² ,
A bottle having a thickness of 4 mm was prepared, and aluminum was deposited on the outer surface of the bottle to form an aluminum deposited layer having a thickness of 700 Å, thereby obtaining a bottle for an iodine-containing preparation. In addition, as an inner lid for sealing the mouth of the iodine-containing preparation bottle, an inner lid made of polylactic acid having a thickness of about 3 mm was prepared, and a screw-in cap was also prepared. The polylactic acid used here had a molecular weight of about 250,000.

On the other hand, as an iodine-containing preparation, 50 g of a powdery preparation having an effective iodine content of 3.86% was prepared. Then, after storing this powdery preparation in the above-mentioned bottle for iodine-containing preparation, the above inner lid was closed, and the cap was further closed and sealed. In this state, the powdered preparation was stored for one month and three months under an atmosphere of 40 ° C., the effective iodine content of the powdery preparation was measured, and the medicinal component retention was calculated. The results are shown in Table 2.

Comparative Example B-1 In the layer constitution of the packaging material, a 25 μm thick polylactic acid film (manufactured by Shimadzu Corporation) was replaced with a 30 μm thick copolymerized polypropylene film (manufactured by Showa Denko KK; Except for changing to Aroma U), the same packaging material as in Example B-1 was used, and the medicinal component retention was measured and calculated in the same manner as in Example B-1. The results are shown in Table 2.

Comparative Example B-2 In the layer structure of the packaging material, a 25 μm thick polylactic acid film (manufactured by Shimadzu Corporation) was changed to a 25 μm thick high density polyethylene film (HG manufactured by Nisseki Plast Co., Ltd.). Except for the change, the same packaging material as in Example B-1 was used, and the medicinal component retention was measured and calculated in the same manner as in Example B-1. The results are shown in Table 2.

Comparative Example B-3 In the layer structure of the packaging material, a 25 μm-thick polylactic acid film (manufactured by Shimadzu Corporation) was replaced with a 30 μm-thick linear low-density polyethylene film (UB-manufactured by Tamapoly Co., Ltd.).
Except for changing to 1), the same packaging material as in Example B-1 was used, and the medicinal component retention was measured and calculated in the same manner as in Example B-1. The results are shown in Table 2.

Comparative Example B-4 Except that a bottle container made of high-density polyethylene was used instead of the polylactic acid bottle container used in Example B-3, a medicinal effect was obtained in the same manner as in Example B-3. The component retention was measured and calculated. The results are shown in Table 2.

Comparative Example B-5 Glass-colored iodine-containing preparation colored brown instead of the iodine-containing preparation bottle used in Example B-3 (a polylactic acid bottle container laminated with an aluminum vapor-deposited layer) Except for using a bottle, the medicinal component retention was measured and calculated in the same manner as in Example B-3. The results are shown in Table 2.

Examples B-1 and B-2 and Comparative Examples B-1 to B-1
As is clear from the results of B-3, when the packaging material having the polylactic acid layer on the inner surface was used, the retention rate of the medicinal component could be kept high. On the other hand, when a packaging material having a polypropylene layer, a polyethylene layer, or the like on the inner surface is used, the retention rate of the medicinal component cannot be maintained high, and only those of Examples B-1 and B-2 are used. In comparison, it was recognized that the retention rate of the active ingredient was reduced. In addition, as is clear from the results of Example B-3 and Comparative Examples B-4 and B-5, the bottle for the iodine-containing preparation in which the polylactic acid layer is present on the inner surface is a conventionally used brown glass bottle. It was found that the drug retention rate was almost the same as that of the active ingredient. On the other hand, in the case of the pharmaceutical bottle in which the high-density polyethylene layer was present on the inner surface, a decrease in the retention rate of the pharmaceutically active ingredient was observed.

Example C-1 First, a polyethylene terephthalate film having a thickness of 12 μm and an aluminum foil having a thickness of 9 μm were used as materials for the packaging material body, using a polyurethane solvent-based adhesive (Adcoat AD76P-1, Toyo Morton Co., Ltd.). ) To prepare a two-layer laminate laminated and bonded by a dry lamination method. On the other hand, as the heat sealing layer, a polylactic acid film obtained by the following method was prepared. That is, melting point 17
An unstretched polylactic acid film having a thickness of 40 µm was prepared by heating and melting polylactic acid having an average molecular weight of about 200,000 at 0 to 180 ° C and extruding it from a T-die. Then, this unstretched polylactic acid film is laminated on the aluminum foil surface of the material of the packaging material body by a dry lamination method using a polyurethane solvent-type adhesive (Adcoat AD76P-1, manufactured by Toyo Morton Co., Ltd.) as an adhesive. Bonded to obtain a packaging material.

On the other hand, the container body has a capacity of 300 cc,
Inner diameter of the mouth (circular mouth) of the container is 60 mmφ, flange width (width of the flange provided at the mouth end and protruding outward) 3
mm wide polyester resin container (blow-molded product)
Were prepared. Then, three (1) 50 ml of d-limonene solution, (2) 50 cc of α-pinene solution, and (3) 50 cc of Myrcene solution were stored in the container body, respectively. Thereafter, the mouth of the container body is sealed with an inner lid obtained by punching the above-mentioned packaging material slightly larger than the mouth of the container body, and three pieces of the same fragrance product, that is, a total of nine fragrance products are obtained. Obtained. In order to seal the mouth of the container body with the inner lid, the unstretched polylactic acid film surface of the inner lid is brought into contact with the end face of the mouth of the container body, and the inner lid is closed with the inner lid to reduce heat and pressure. This was performed by applying to an unstretched polylactic acid film. The obtained fragrance products (package containing fragrance components) are stored one by one in a closed space maintained at normal temperature at a temperature of 20 ° C., a temperature of 40 ° C. and a temperature of 60 ° C., and one day has passed. Each time, whether or not the fragrance component was leaked was inspected by sensory evaluation. Table 3 shows the results.

[0060]

[Table 3] In Table 3, "No leakage" is indicated by 3
This is a case in which leakage of the fragrance component could not be confirmed by sensory even after 0 days had passed. In addition, the description “1 day” means a case where leakage of the fragrance component was confirmed by sensory function after one day. "2 days" and "3 days"
Also, in the case where leakage of the fragrance component could be confirmed by sensory after 2 days and 3 days.

Comparative Example C-1 An ethylene-vinyl acetate copolymer film (Mersen F013) was used as the heat sealing layer instead of the unstretched polylactic acid film.
T, manufactured by Tosoh Corporation, thickness 30 μm)
After obtaining a fragrance product in the same manner as in Example C-1, the leakage was inspected. Table 3 shows the results.

Comparative Example C-2 Example C was repeated except that a low-melting polyester resin film (ABF011C, manufactured by Tocelo Co., Ltd., thickness: 30 μm) was used as the heat sealing layer instead of the unstretched polylactic acid film.
After obtaining a fragrance product in the same manner as -1, the leakage was inspected. Table 3 shows the results.

The above Example C-1, Comparative Examples C-1 and C
As is clear from the results of -2, the fragrance product according to Example C-1 using the polylactic acid layer as the heat sealing layer of the inner lid that seals the mouth of the container body does not use the polylactic acid layer. It can be seen that there is less leakage of the fragrance component as compared with Comparative Examples C-1 and C-2. This effect is due to the fact that the polylactic acid layer does not easily absorb the fragrance component and the heat-sealing layer does not deteriorate, so that the adhesive strength between the mouth end surface of the container body and the inner lid remains high. This is considered to be because the gap can be maintained or a gap is hardly generated between the mouth end surface and the inner lid. On the other hand, in the case of the fragrance product in which the polylactic acid layer is not used as the heat sealing layer, the fragrance component is absorbed in the heat sealing layer, causing deterioration, and the adhesive strength is gradually reduced, or between the inner lid and the mouth end surface. It is considered that a gap is formed between the gaps, and as a result, the fragrance component leaks.

[0064]

As described above, using the packaging material according to the present invention in which the inner surface is composed of a polylactic acid layer, foods and drinks, pharmaceuticals, bathing agents, fragrances and deodorants containing various flavor components are used. When packaging various packaging materials such as fragrances such as odorants and detergents, it is difficult for each fragrance component in the packaging material to be absorbed into the polylactic acid layer. This has the effect that the taste, medicinal effect or fragrance of the packaged product is not easily changed or deteriorated. Further, when the iodine-containing preparation is hermetically packaged using the packaging material according to the present invention, the inner surface located on the preparation side is formed of a polylactic acid layer,
It is considered that the polylactic acid layer hardly absorbs a medicinal ingredient such as iodine and can prevent the medicinal ingredient from penetrating into a packaging material. As a result, it is possible to prevent a decrease in the medicinal component content of the iodine-containing preparation, and a package in which the iodine-containing preparation is hermetically sealed with the packaging material according to the present invention can be stored for a long period of time. The effect of preventing a decrease in the effect is exhibited, and this is extremely useful in use.

When the polylactic acid layer functions as a heat-sealing layer, it is not necessary to separately apply a heat-sealing agent to the mouth of the bag when hermetically sealing the package. By heat sealing, the article to be packaged can be sealed.

Furthermore, the polylactic acid layer constituting the packaging material according to the present invention is excellent in biodegradability when buried in soil, so that incineration may not be necessary in some cases. In some cases, disposal processing can be performed only by using In such a case, it can be said that the packaging material according to the present invention is preferable in protecting the global environment.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a layer structure of a packaging material according to an example of the present invention.

FIG. 2 is a schematic sectional view showing a layer structure of a packaging material according to another example of the present invention.

FIG. 3 is a schematic sectional view showing a layer structure of a packaging material according to another example of the present invention.

FIG. 4 is a schematic sectional view showing a layer structure of a packaging material according to another example of the present invention.

FIG. 5 is a schematic sectional view showing a layer structure of a bottle according to an example of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Polylactic acid layer 2 Aluminum foil 2 'Aluminum vapor deposition layer 3 Synthetic resin film layer 4 Adhesive layer 5 Adhesive layer

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI B32B 15/08 104 B32B 27/00 A 27/00 B65D 65/42 A B65D 65/42 C08L 67/04 C08L 67/04 C23C 14 / 14 B C23C 14/14 A61J 1/00 311

Claims (14)

[Claims] 1. A packaging material for packaging an object to be packaged, wherein the packaging material comprises a packaging material main body and a polylactic acid layer laminated on an inner surface of the packaging material main body. Packaging material. 2. The packaging material according to claim 1, wherein the polylactic acid layer is a heat sealing layer. 3. The packaging material according to claim 1, wherein the polylactic acid layer is a polylactic acid film. 4. The packaging material according to claim 3, wherein the polylactic acid film is a stretched polylactic acid film. 5. The packaging material according to claim 3, wherein the polylactic acid film is an undrawn polylactic acid film. 6. The packaging material according to claim 1, wherein the polylactic acid layer is a layer formed by coating polylactic acid. 7. The packaging material according to claim 1, wherein the packaging material body includes at least a metal foil. 8. The packaging material according to claim 1, wherein the packaging material body includes at least an aluminum vapor-deposited layer. 9. The packaged product is a food or drink, a pharmaceutical, a fragrance,
The packaging material according to any one of claims 1 to 8, wherein the packaging material is selected from the group consisting of a bath additive and a deodorant. 10. The packaging material according to claim 1, wherein the article to be packaged is an iodine-containing preparation, and the packaging material body contains at least a layer having a light barrier property. 11. The packaging material according to claim 10, wherein the layer having a light barrier is a layer formed by coating a brown ink. 12. A packaging container comprising a bottle containing an iodine-containing preparation to be packaged and a lid for closing the mouth of the bottle, wherein the bottle is a light barrier layer formed in a bottle shape. And a polylactic acid layer laminated on an inner surface of the layer having a light barrier property. 13. A packaging container comprising a container body containing an aromatic or deodorant as an article to be packaged and an inner lid for sealing a mouth of the container body, wherein the inner lid is an inner lid body. And a polylactic acid layer laminated on the inner surface of the inner lid body,
A packaging container for a fragrance or a deodorant, wherein the polylactic acid layer is used as a heat sealing layer and the mouth of the container body is sealed. 14. The packaging container for an aromatic or deodorant according to claim 13, wherein the container body is formed of a polyester resin.