JPH11970A - Aroma substance packaging - Google Patents

Abstract

(57) [Summary] [Problem] It is easy to control the release of odorous substances,
Provided is a package in which various types of fragrant substances are packaged in various types of containers. SOLUTION: A package formed by packaging a fragrance substance using a multilayer body composed of an outermost layer (A) composed of an fragrance substance blocking resin layer and an innermost layer (B) composed of a fragrance substance permeable resin layer. .

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a package for packaging an odorous substance. More specifically, the present invention relates to a package in which a fragrance substance is completely sealed during storage, and in which the release of the fragrance substance can be easily started when used, and the fragrance substance can be controlled.

[0002]

2. Description of the Related Art Conventionally, a package formed by packaging an odorous substance requires removing the entire packaging material at the time of use. Therefore, various forms of fragrance such as solid, powder, and liquid are used. There is a problem that the substance cannot be used in containers of various shapes. Further, in order to release the fragrant substance at an appropriate rate, the composition of the carrier of the fragrant substance is limited. Conventionally, an attempt has been made to package a liquid fragrance substance in a double bag in which a bag blocking the fragrance substance is placed inside and a bag permeable to the fragrance substance is placed outside. This method is
It is necessary to crush the inner bag to release the fragrance during use, but it is difficult to break the inner bag without breaking the outer bag, there was a risk of the outer bag being broken and the fragrance scattered .

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to solve the conventional problems, to easily control the release of fragrant substances, and to pack various forms of fragrant substances into containers of various forms. It is an object of the present invention to provide a package comprising:

[0004]

According to the present invention, a multi-layer structure comprising an outermost layer (A) composed of an odorant-blocking resin layer and an innermost layer (B) composed of an odorant-permeable resin layer is used. Provided is a package formed by packaging an aromatic substance.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Each component constituting the package of the present invention will be described. Aroma substance blocking resin layer, polyvinyl alcohol, ethylene-vinyl alcohol copolymer, film or sheet made of acrylonitrile copolymer, film or sheet coated with vinylidene chloride copolymer, cellophane film, polyethylene, polyethylene terephthalate, A film or sheet obtained by laminating polyamide or the like on an aluminum foil sheet in one or more layers can be used. Among these, a film made of polyvinyl alcohol or an ethylene-vinyl alcohol copolymer is particularly preferred.

The polyvinyl alcohol used in the present invention will be described. Polyvinyl alcohol is obtained by polymerizing a vinyl ester in a bulk or in a solvent such as an alcohol in the presence of a radical initiator, and then partially or highly saponifying it by the action of an alkali or acid catalyst. Here, the vinyl ester includes vinyl acetate, vinyl propionate, vinyl formate, vinyl versatate, vinyl pivalate and the like, and vinyl acetate which is industrially produced and has a cost advantage is usually used. The degree of polymerization of polyvinyl alcohol is not particularly limited, but from the viewpoint of high strength and flexibility as well as film strength and toughness at a thin thickness of 10 to 100 microns,
300-8000 in viscosity average degree of polymerization, preferably 400
~ 3000. The degree of saponification of polyvinyl alcohol has a great effect on the water solubility, strength, stiffness and bag making properties of the film, and the degree of saponification is 50 to 99 mol%, preferably 60 to 99 mol%. The polyvinyl alcohol used in the present invention includes unsaturated carboxylic acids such as maleic acid and its derivatives, itaconic acid and its derivatives, allyl sulfonate, and acrylamide, as long as they do not significantly impair the water-soluble or odorant blocking performance. It may contain copolymerized units such as unsaturated sulfonates such as 2-methylpropyl sulfonate, α-olefins such as ethylene, ω-hydroxy-α-olefins, and polyalkylene oxide-containing unsaturated compounds. The content of these units is preferably from 0.1 to 15 mol%.

[0007] Next, ethylene used in the present invention.
Used for vinyl alcohol copolymer. A conventionally known ethylene-vinyl alcohol copolymer can be used. For example, it can be obtained by polymerizing ethylene and vinyl ester in a solvent such as methanol or t-butanol under pressure using a known polymerization initiator, and subsequently saponifying with an acid or alkali catalyst. The ethylene content of the ethylene-vinyl alcohol copolymer is 15 to
It is 65 mol%, preferably 25 to 60 mol%, more preferably 25 to 50 mol%. If the amount of ethylene exceeds 65 mol%, sufficient odorant blocking performance cannot be obtained. The saponification degree of the vinyl ester component is 90 mol% or more, preferably 9 mol%.
It is at least 5 mol%, more preferably at least 98 mol%. If the degree of saponification is less than 90 mol%, problems are likely to occur in the performance of blocking odorous substances and thermal stability. JIS-K-7210
The melt index measured at (temperature 210 ° C., load 2160 g) is preferably 0.1 to 100 g / 10 minutes,
0.5 to 50 g / 10 min is more preferable, and 1 to 20 g /
10 minutes is more preferred. In the ethylene-vinyl alcohol copolymer, a small amount of propylene, isobutene, 4-methylpentene-1, hexene, octene and other α-olefins, itaconic acid, unsaturated carboxylic acids such as maleic anhydride, salts thereof, parts thereof or Derivatives such as complete esters, nitriles thereof, amides thereof, derivatives thereof such as anhydrides, vinylsilane compounds such as vinyltrimethoxysilane, unsaturated sulfonic acids, salts thereof, alkylthiols, and copolymerization components such as N-vinylpyrrolidone. You can be there. Further, an ethylene-vinyl alcohol copolymer which has been subjected to a hydrogen peroxide treatment described in JP-A-6-298847 may be used.

[0008] The polyvinyl alcohol and ethylene-vinyl alcohol copolymer used in the odorant blocking layer are not limited to a single one, but two or more of which have different resin compositions such as polymerization degree, saponification degree and ethylene content. It may be a mixture of resins or a laminate. In addition, the resin used for the odorant blocking layer may be crosslinked with an antioxidant, a coloring agent, an ultraviolet absorber, a slip agent, an antistatic agent, a plasticizer, boric acid, or the like, as long as the effects of the present invention are not impaired. Agent, inorganic filler,
Various additives such as an inorganic desiccant, and various resins such as polyamide, polyolefin, and superabsorbent resin may be blended.

It is essential that the odorant-blocking resin layer is at least part of the outermost layer of the package. However, it is not always necessary to package the entire package, and it may be used for only a part of the container for controlling the release of the odorant. For example, it can be used only on one side of the bag. Further, it can be used only for the lid portion of containers such as cups, bottles and trays of fragrant substances. The shape and thickness of the resin layer are not particularly limited, and any resin can be used as long as the fragrant substance is not released or leaked to the outside during packaging and storage.
In general, a resin layer having a thickness of 5 to 100 μm is preferably used in consideration of the operability of forming a multilayer body and the strength of the film.

When the odor blocking layer is a water-soluble resin layer, it can be removed by dissolving or dispersing the water-soluble resin layer with water at the time of use. As the water-soluble resin layer, polyvinyl alcohol, polyethylene glycol,
It is a resin layer composed of a film or sheet composed of polyvinylpyrrolidone, polyacrylamide, polyvinyl ether, starch and the like. These resins are used alone or in a blend. Among these, a polyvinyl alcohol film or sheet having excellent water solubility and also having a barrier property of an aroma substance is preferably used.
When the odorant blocking layer is a water-soluble resin layer, the water-soluble resin layer is removed by dissolving or dispersing it in water at the time of use. In this case, since the innermost fragrance-permeable layer uses a water-insoluble film or sheet, the inner layer is not damaged in the presence of water and the fragrance does not scatter outside. Other operations other than removing the water-soluble resin layer include operations such as immersing the entire package in cold or warm water, or wiping with a cloth containing water.

The innermost odorant-permeable resin layer includes a resin layer made of a homopolymer of ethylene, propylene, butene or the like, or a copolymer thereof. Further, a single sheet or film of a polymer such as styrene or methyl methacrylate, or a copolymer with an olefin can also be used. Among these, a polymer of ethylene is preferable, a low-density polyethylene and a copolymer thereof are more preferable, and an ethylene-vinyl acetate copolymer is particularly preferable. In a special case, a liquid or the like does not leak to the outside, and a microporous film or sheet that transmits only the fragrant substance can be used as the fragrant substance permeable resin layer. It is essential that the fragrant substance permeable resin layer is present on at least a part of the package. However, it is not always necessary to package the entire package, and only a part of the package can be used for controlling the release of the fragrant substance.

The method for producing the multilayer body of the present invention can employ a known method such as dry lamination, hot melt lamination, extrusion lamination, polysand lamination, coextrusion lamination, blow molding, heat lamination, injection molding, and thermoforming. is there. After packaging the odorant, the multilayer body needs to remove the outermost odorant blocking layer at the time of use. When the odorant blocking layer is made of a water-soluble resin, it can be dissolved and removed in water, but when it is made of a water-insoluble resin, it is necessary to mechanically peel off the odorant blocking layer from the multilayer body. Requires a multilayer body having an appropriate laminating strength. An adhesive, an anchor coat agent, an adhesive resin, or the like may be used to obtain an appropriate interlayer adhesion. As the shape of the multilayer body, bags, cups, trays, bottles and lids of cups, trays, bottles and the like can be adopted.

[0013]

EXAMPLES The present invention will be described in more detail with reference to the following Examples, but it should not be construed that the invention is limited thereto. In the examples, “%” and “parts” are based on weight unless otherwise specified.

Example 1 Ethylene content 32 mol%, 210 ° C., load 2160 g
And an ethylene-vinyl alcohol copolymer having a melt index of 2.0 g / 10 min.
Mol%, melt index at 190 ° C. 4.8 g
Co-extrusion lamination with ethylene-vinyl acetate copolymer for / 10 min to obtain a multilayer body comprising a resin layer of ethylene-vinyl alcohol copolymer having a thickness of 15 μm and a resin layer of ethylene-vinyl acetate copolymer having a thickness of 25 μm Was manufactured. The peel strength between the resin layers was 20 g / 2.5 cm. Put a citrus liquid fragrance substance into a glass bottle with a diameter of 5 cm and a height of 4 cm.
A multilayer sheet having a resin layer made of an ethylene-vinyl alcohol copolymer as an outer layer and a resin layer made of an ethylene-vinyl acetate copolymer as an inner layer was adhered to a bottle mouth. During storage, the fragrance of the fragrance was not released to the outside because of the fragrance blocking layer composed of the ethylene-vinyl alcohol copolymer layer. When the resin layer made of the ethylene-vinyl alcohol copolymer was peeled off during use to expose the resin layer of the ethylene-vinyl acetate copolymer, the citrus aroma filled the room for a long time.

Example 2 To give a suitable adhesive strength to a 30 μm thick film made of polyvinyl alcohol having a saponification degree of 92 mol% and a polymerization degree of 1250, 0.15 g / m ² of a maleic acid-modified polyvinyl acetate resin was applied on the film. And the ethylene-vinyl acetate copolymer used in Example 1 was subjected to extrusion lamination to produce a multilayer film. The polyvinyl alcohol resin layer was used as the outer layer, and the resin layer of the ethylene-vinyl acetate copolymer was used as the inner layer.
A bag consisting of a multilayer body of × 10 cm was prepared. In this,
50 g of the citrus fragrance substance used in Example 1 was charged and heat-sealed to obtain a bag containing the fragrance substance. There was no release of odorant from this bag. At the time of use, this bag was immersed in warm water at 40 ° C. to dissolve and remove the polyvinyl alcohol film on the outermost layer of the bag to obtain a bag composed of a resin layer of an ethylene-vinyl acetate copolymer containing an odorous substance. . When this bag was left in a plastic container with a hole, the citrus aroma filled the room for a long time.

Example 3 After dissolving a composition of 100 parts of polyvinyl alcohol having a degree of saponification of 88 mol% and a degree of polymerization of 1700 and 15 parts of glycerin in warm water, the water was dried to obtain a film having a water content of 5% and a thickness of 40 μm. Was. The film has methanol / water =
3 g / m ² of a polyethyleneimine solution having a solid content of 3% dissolved in an 8/2 (weight ratio) solvent was applied and dried with warm air at 60 ° C. On the surface coated with the anchor coat, 320
° C low-density polyethylene (190 ° C, melt index at a load of 2160 g: 7.0 g / 10 min, specific gravity: 0.
919) was extruded and laminated to a thickness of 60 μm. The polyvinyl alcohol resin layer was used as the outer layer and the low density polyethylene resin layer was used as the inner layer.
A multi-layer bag of cm × 5 cm was prepared. The citrus liquid fragrance substance used in Example 1 was put in the multilayer bag, and the package was impulse-sealed to obtain a packaging bag containing the fragrance substance. During storage, there was almost no leakage of the odorant from the bag.
At the time of use, the packaging bag was washed with water at 10 ° C. to remove the polyvinyl alcohol resin layer. The room in which the bag was placed was full of citrus aroma for a long time.

EXAMPLE 4 A composition comprising 100 parts of polyvinyl alcohol having a saponification degree of 73 mol% and a polymerization degree of 500 and 10 parts of polyethylene glycol was heated and melted at 180 ° C. and modified with maleic anhydride to obtain a linear low-density polyethylene (190 parts). ° C, melt index under a load of 2160 g: 8.0 g / 10 min, specific gravity: 0.
909) was heated and melted at 220 ° C., and was co-extruded using a feed block die so that each had a thickness of 60 μm to obtain a laminated film. Using a laminate film having polyvinyl alcohol as the outer layer and polyethylene as the inner layer, a packaging bag containing an odorant was obtained in the same manner as in Example 3. During storage, there was almost no leakage of the odorant from the bag. At the time of use, the packaging bag was washed with water at 10 ° C. to remove the polyvinyl alcohol resin layer. The room in which the bag was placed was full of citrus aroma for a long time.

[0018]

The package of the present invention can use various forms of fragrant substances. For example, large individuals such as balls, dice, and blocks, as well as particles,
Powders and liquids having no shape such as liquids can also be adopted, and the fragrant substance does not scatter or leak even if the container is dropped or dropped. In addition, the release rate of the fragrant substance can be freely adjusted by selecting the configuration, thickness, area, and the like of the container or bag including the resin layer forming the fragrant substance permeable layer.

Claims (4)

[Claims] 1. A package obtained by packaging a fragrant substance using a multilayer body composed of an outermost layer (A) composed of an odorant-blocking resin layer and an innermost layer (B) composed of an fragrant substance-permeable resin layer. body. 2. The package according to claim 1, wherein the odorant-blocking resin layer is a water-soluble resin layer. 3. The method for using a package according to claim 1, wherein the outermost layer (A) of the package is peeled and removed at the time of use. 4. The method for using a package according to claim 2, wherein the outermost layer (A) of the package is removed by dissolving or dispersing in water when used.