JP2001213459A - Lid member for aromatic polyester resin container and packaging body using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a favorable easy peelability and punching property to a lid member which seals the opening of an aromatic polyester resin container. SOLUTION: The lid member seals the opening of the aromatic polyester resin container. In such a lid member, a heat-sealing layer, of which the major component is an aliphatic polyester polymer, is provided on the outermost layer of the lid member. Then, the heat-sealing layer contains 5 to 20 pts.wt. of an inorganic particle, of which the average particle diameter is 1 to 10 μm, based on 100 pts.wt. of the aliphatic polyester polymer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cover material for sealing an opening of an aromatic polyester resin container and a package using the cover material. The present invention relates to a lid material for sealing an opening of a container for accommodating a deodorant or a sanitary product, a toiletry product, cosmetics or the like containing the same, and a package using the lid material.

[0002]

2. Description of the Related Art Many fragrance components are contained in fragrances and / or deodorants used in entrances, toilets, kitchens, automobiles, rooms, and the like. Many of the aroma components are sorbed to the polyolefin resin when stored in a polyolefin resin container, or are scattered to the outside through the container. The container was considered. For example, JP-A-11-350
No. 58 discloses a package using an aromatic polyester resin such as polyethylene terephthalate as a container material and using an aliphatic polyester resin as a heat sealing layer. However, the lid material disclosed herein has a problem in easy peeling with the aromatic polyester resin container, and the lid material cannot be easily peeled off at the time of use, and a large force is required at the time of peeling. In some cases, or damaged the opening of the container. Further, when punching the lid material, for example, when punching a lid material shape such as a circle or a square before or after heat sealing to the container opening, the heat sealing layer of the lid material adheres to the punching device. In addition, as a result, problems such as wrinkling of the lid material of the punched product and ugly punched cross section have occurred.

[0003]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a lid for an aromatic polyester resin container having good easy peelability and punching properties. It is an object of the present invention to provide a material and a package using the lid material.

[0004]

SUMMARY OF THE INVENTION A cover material for an aromatic polyester resin container of the present invention is a cover material for sealing an opening of an aromatic polyester resin container, and is provided on the outermost layer of the cover material. An aliphatic polyester-based polymer having a heat-sealing layer as a main component, wherein the heat-sealing layer is 5 to 20 parts by weight of inorganic particles having an average particle diameter of 1 to 10 μm based on 100 parts by weight of the aliphatic polyester-based polymer. Characterized by containing The package of the present invention is characterized in that the opening of the aromatic polyester-based resin container is sealed using the cover material for the aromatic polyester-based resin container.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The cover material for an aromatic polyester resin container of the present invention has a layer (heat sealing layer) mainly composed of an aliphatic polyester polymer as an outermost layer. The heat sealing layer is
It is formed from a composition in which inorganic particles having an average particle size of 1 to 10 μm are blended at a ratio of 5 to 20 parts by weight with respect to 100 parts by weight of the aliphatic polyester polymer. When the content of the inorganic particles is less than 5 parts by weight, the punching property is poor, and when the content is more than 10 parts by weight, bumps are generated and the appearance is inferior. Inorganic particles preferably used in the present invention include talc, mica, silica, calcium carbonate and the like.

The aliphatic polyester polymer used in the heat sealing layer of the present invention has an alkylene group and an ester bond as a basic skeleton, and the basic skeleton has a urethane bond, an amide bond and an amide bond in addition to the ester bond. A bond, an ether bond, or the like may be introduced. Specific examples of the aliphatic polyester-based polymer include an aliphatic polyester-based polymer obtained by condensing an aliphatic diol and an aliphatic dicarboxylic acid. Examples of the aliphatic diol include ethylene glycol, propylene glycol, 1,4-butanediol, and the like.As the aliphatic dicarboxylic acid,
Representative examples include succinic acid, adipic acid, suberic acid, sebacic acid and dodecane diacid. From among these aliphatic diols and aliphatic dicarboxylic acids, one or more kinds are each selected and subjected to condensation polymerization, and then, if necessary, a polymer which jumps up to a weight average molecular weight of 50,000 or more with an isocyanate compound is usually 60 to 110. It has a heat melting temperature (Tm) of ° C. and relatively excellent basic physical properties of polyethylene-like, and can be preferably used in the present invention. Aliphatic polyester-based polymers having a glass transition temperature (Tg) of 150 ° C. or lower are commercially available.
For example, there is a "Bionole" series manufactured by Showa High Polymer Co., Ltd.

Next, aliphatic polyester polymers obtained by ring-opening polymerization of cyclic lactones using an organic metal catalyst are exemplified. Cyclic lactones that are monomers include ε
-Caprolactone, δ-valerolactone, β-methyl-
Representative examples include δ-valerolactone, β-propiolactone, pivalolactone, β-butyrolactone, and γ-butyrolactone. One or more monomers selected from these cyclic lactones may have a weight average molecular weight of 30,000 together with a small amount of lactide or glycolide in some cases.
The polymerization is carried out by adjusting the conditions so as to be 0 or more.

Other chemically synthesized aliphatic polyester polymers include polymers of cyclic acid anhydrides and oxiranes, such as polymers of succinic anhydride and ethylene oxide, propylene oxide or allyl glycidyl ether. , Ethylene and cyclic ketene acetal such as 2-methylene-1,3-dioxolan and 2-methylene-1,3
-A radical polymer with dioxepane.

A polylactic acid-based polymer, which is one of the aliphatic polyester-based polymers, is L-lactic acid, D-lactic acid or DL-lactic acid.
It is a polymer containing a lactic acid unit as a main component or a mixture of these polymers, and is an optical isomer of lactic acid (D-lactic acid for L-lactic acid and L-lactic acid for D-lactic acid). Can be copolymerized. The polylactic acid-based polymer may contain other hydroxycarboxylic acids and the like as a small amount of a copolymer component, and a small amount of a chain extender for the purpose of increasing the molecular weight, for example, a diisocyanate compound, a diepoxy compound, and an acid anhydride. , Acid chloride and the like.
In these cases, a urethane bond, an amide bond, an ether bond, or the like may be introduced into the polymer skeleton in addition to the above-described ester bond. In the present invention, a polylactic acid-based polymer includes all of these polymers.

[0010] Monomers such as a copolymer component copolymerized with polylactic acid include glycolic acid, 3-hydroxybutyric acid,
4-hydroxybutyric acid, 2-hydroxy-n-butyric acid, 2-
Hydroxy-3,3-dimethylbutyric acid, 2-hydroxy-
Bifunctional aliphatic hydroxycarboxylic acids such as 3-methylbutyric acid, 2-methyllactic acid, 2-hydroxycaproic acid, 6-hydroxycaproic acid, 3-hydroxyvaleric acid, 4-hydroxyvaleric acid and the like, caprolactone, butyrolactone, valerolactone, etc. Lactones.

The biosynthetic aliphatic polyester polymer may be acetylcoenzyme A (acetyl-Co) in cells such as alkaligenes eutrophas.
An aliphatic polyester polymer biosynthesized according to A) is mentioned. The most typical one is poly-β-hydroxybutyric acid (poly 3HB). However, as it is Tm
Is too high, and the heat sealing strength may be reduced due to crystallization of the container material during heat sealing. Therefore, the fermentation process and the like are devised to improve the valeric acid unit (2 to 5 HV) and the poly-γ-hydroxybutyric acid unit (4HB). ) Is preferred.

An arbitrary method can be adopted as a method of blending the aliphatic polyester polymer. That is, the raw material pellets may be dry-blended and supplied to a resin processing extruder, or once compounded by a twin-screw extruder having a high kneading effect, and then supplied to a processing extruder.

In the present invention, the lid for sealing the opening of the aromatic polyester resin container is usually at least
The heat sealing layer is composed of a heat sealing layer and a substrate supporting the heat sealing layer, and the heat sealing layer exerts a function of blocking fusion with an opening of the container and an aroma component, and a function of blocking the required rigidity and water vapor of the substrate. preferable. In terms of shape, it is necessary that the heat sealing layer has a surface that is in close contact with the periphery of the container opening.

The thickness of the heat sealing layer can be determined arbitrarily.
Generally, it is preferably from 1 to 1,000 μm,
To 500 μm, more preferably 10 to 200 μm.
Most preferably, it is μm. Heat sealing layer thickness is 1μ
If it is at least m, there will be no inconvenience in production, and the blocking of fragrance components will be sufficient. Thickness of heat sealing layer is 1,000μ
When the value is m or less, there is no economic disadvantage, heat transfer is good, and good heat sealing properties can be exhibited.

The heat-sealing layer is obtained by extruding an aliphatic polyester resin into a film from a T-die, an I-die, a circular die or the like using a resin processing extruder. And used. By applying a surface treatment such as corona treatment or plasma treatment to the heat sealing layer, not only can the printing ink be transferred to the surface of the layer during printing, but also the adhesion of the lid material to the substrate can be improved. Can be improved.

Specific examples of the material used for the substrate include:
Polyolefin films such as polyethylene films and polypropylene films, polyester films such as PET films, polyvinyl chloride films, polystyrene films, polycarbonate films, various synthetic resin thin films such as polyamide films, metal thin films such as aluminum foil, Examples include sheet-like materials such as vapor-deposited thin films of metals and metal oxides, paper, nonwoven fabric, knitted fabric, and woven fabric. These thin films or sheet materials can be used alone or in combination of two or more. Specific examples of the laminate include aluminum foil / polyester film, polyvinylidene chloride film / stretched nylon film, stretched nylon film / aluminum foil, polypropylene film / polyvinyl alcohol film /
Examples include a combination of a polypropylene-based film and the like. In the case of these laminates, they are often laminated and bonded using an arbitrary adhesive, but they can be laminated by a coating method or a laminating method without using an adhesive.

The lid material for an aromatic polyester resin container of the present invention is often provided in the form of a film in which a heat sealing layer and a substrate are laminated, and the film in which both are laminated is shaped into a desired shape. A heat-sealing layer film may be laminated on a substrate formed in a predetermined shape in advance. At the time of lamination, an adhesive may be used. When an adhesive is used, the adhesive is appropriately selected. For example, when the base is made of aluminum foil or the like, it is preferable to use a polyurethane-based adhesive. Also, when the substrate is made of an aluminum foil and a PET film, a polyurethane-based adhesive is preferably used. The thickness of the aluminum foil used as the base material is preferably 4 to 60 μm.

In the present invention, for example, after a fragrance or the like is stored in an aromatic polyester resin container, a lid material is attached to the opening of the container, and welding is performed by applying heat and pressure to a portion in contact with the periphery of the opening. By doing so, a package can be formed. That is, the heat sealing layer made of the aliphatic polyester resin on the surface of the lid material is brought into contact with the periphery of the opening of the aromatic polyester resin container, heated and pressed, and heat sealed to obtain a sealed package. be able to. At the time of heat sealing, it is preferable to select a condition that does not cause crystallization of the aromatic polyester-based resin constituting the container opening.

The package of the present invention can be used, for example, in a mode in which a fragrance or the like is stored. Conventionally, however, these fragrance components could not be held and sealed only inadequately depending on the material of the container or lid material. . However, in the package of the present invention, since the container is made of an aromatic polyester and the heat sealing layer of the lid material is a layer containing an aliphatic polyester resin as a main component, the fragrance component can be completely contained and retained. it can. Such fragrance components include, for example, p-menthane, pinene, d-
Terpene-based hydrocarbon compounds such as limonene, myrcene, terpinene, 1,8-sionone, caren, sapinene, and β-caryophyllene; terpene alcohol compounds such as geraniol, nerol, citraner, terpineol, linalool, menthol, nerolidol, and vorioner Or their esters; terpene aldehyde compounds such as citral and citronellal; alcohols such as octanol, benzyl alcohol and eugenol; esters such as ethyl caproate, amyl benzoate and ethyl cinnamate; Nonalactone, γ-decalactone, γ-undecalactone, δ-nonalactone, δ-decalactone,
Lactones such as δ-undecalactone; ketones such as ionone and methylionone; lemon oil, orange oil, lime oil, eucalyptus oil, hinoki oil, hiba oil, pine oil, turpentine oil, ho oil, lavender oil, jasmine oil Essential oils such as, for example, vanilla, peppermint, spearmint, and many other organic compounds are known.

The package of the present invention is suitable for accommodating fragrance-containing components such as fragrances and / or deodorants, but is not limited thereto. It can be widely used as a means for storing and distributing parts and other items to be packaged.

The aromatic polyester resin used as the container of the present invention contains an aromatic dicarboxylic acid such as terephthalic acid, isophthalic acid or naphthalenedicarboxylic acid as a dicarboxylic acid component which is a constituent monomer of the polyester. Terephthalate (PE
T), polyethylene naphthalate (PEN) and the like are known. The diol component, which is the other constituent monomer of these aromatic polyester resins, is not particularly limited. Normally, aliphatic diols such as ethylene glycol, diethylene glycol and 1,4-butanediol are often used, but in order to reduce crystallinity without lowering Tg, an alicyclic diol such as cyclohexanedimethanol is used. The used aromatic alicyclic polyester resin (trade name: PETG, manufactured by Eastman Chemical Company) can also be preferably used.

[0022]

EXAMPLES The present invention will be described specifically with reference to examples below.
The present invention is not limited to these. Example 1 First, polyethylene terephthalate (PET) having a volume of 100 cc, a flange inner diameter of 60 mm, and a flange width of 3 mm.
A wide-mouth container was prepared. Next, a PET film having a thickness of 12 μm and an aluminum foil having a thickness of 9 μm are dry-laminated with a polyurethane solvent-based adhesive (trade name: Adcoat AD76P-1, manufactured by Toyo Morton Co., Ltd.) as a base material of the lid member. A two-layer laminate was prepared. As the heat sealing layer made of an aliphatic polyester resin, a film obtained by the following method was prepared. That is, an aliphatic polyester resin 100 mainly composed of succinic acid, adipic acid and 1,4-butanediol and having a Tm of 95 ° C.
Parts by weight and 5.0 parts by weight of talc (trade name: Micellone, manufactured by Hayashi Kasei Co., Ltd.) having an average particle size of 1.0 μm are kneaded using a twin-screw extruder to form pellets. Using a single screw extruder provided, the film was extruded into a film and quenched with a cast roll to produce a film having a thickness of 40 μm. The obtained film has a tensile modulus of 130 kgf / mm.
It was ² . The obtained film was laminated and adhered to the aluminum foil surface of the substrate by a dry lamination method using a polyurethane-based solvent-type adhesive (trade name: Adcoat AD76P-1, manufactured by Toyo Morton Co., Ltd.) as an adhesive. Materials were produced.

The obtained cover material was evaluated for easy peelability and punching ability according to the following methods. The appearance of the lid was visually evaluated. That is,
“○” indicates that talc or the like is less likely to occur, and “△” indicates that agglomeration occurs but is within the range of a practical level. Is indicated by “x”. Table 1 shows the results.
Shown in The average particle diameter of the inorganic particles can be determined by using a particle size distribution analyzer (trade name: SA-CP3L, manufactured by Shimadzu Corporation) by natural sedimentation and liquid phase dispersion sedimentation under centrifugal force.
According to the light transmission method, JIS Z-8820, JIS Z-
8822.

Next, a package was formed using the obtained lid material. That is, in a container made of an aromatic polyester resin, (1) d-limonene liquid 50 cc,
(2) α-pinene solution 50cc, (3) myrcene solution 50c
c were individually housed, and a heat sealing layer made of an aliphatic polyester resin as a cover material was brought into contact with a container flange portion, and heat sealing was performed to produce a sealed package. When the obtained package was evaluated for hermeticity, it was found that the aroma component did not leak out at all even after a long period of time, indicating that the hermeticity was excellent.

Evaluation of easy peelability: The obtained lid material and a 50 μm-thick non-stretched PET film are cut into strips each having a width of 30 mm and a length of 100 mm parallel to the extrusion direction. Strip-shaped lid material sample and strip-shaped unstretched P
The ET film was overlaid, set parallel to the heat seal bar (10 mm width × 90 mm length) of the heat sealer and the ends thereof, and then heated from one side at 120 ° C. under a pressure of 1.2 kgf / cm ² . For 1 second. Thereafter, peeling was performed from the unsealed portion, and evaluation was performed based on the following criteria. ：: excellent in sealability and peelability △: sealability and peelability are practical levels ×: sealability and peelability are impractical levels

Evaluation of punching property: The obtained lid material was cut into a size of 100 mm x 100 mm, and this was brought into contact with an opening of a PET container which is an aromatic polyester resin container having an inner diameter of 60 mm and a peripheral width of 1 mm. And heat sealed at a temperature of 120 ° C. Place a plastic plate under the lid outside the seal,
A punching test of the lid material was performed using a punching device.
The punching performance of the cover material was evaluated based on the following criteria. ：: It can be punched cleanly and has excellent punching properties. △: Although it can be punched, wrinkles are slightly generated. However, it is a practically usable level. X: Punching is not possible, and it is a practically impossible level.

Examples 2 to 6 and Comparative Examples 1 to 4 In the same manner as in Example 1, except that the kind of inorganic particles, the average particle diameter, and the amount of addition were changed as shown in Table 1, Materials and packages were produced. The same evaluation as in Example 1 was performed on the obtained lid material and package. Table 1 shows the results.

[0028]

[Table 1]

As is clear from Table 1, the lid materials of Examples 1 to 6 in which the heat sealing layer contains 5 to 20 parts by weight of inorganic particles having an average particle size of 1 to 10 μm have easy peelability, punching property and All appearances were found to be above practical levels. On the other hand, in Comparative Example 1, the easy peelability was inferior, in Comparative Examples 2 and 4, the appearance was poor, and in Comparative Example 3, the punching property was inferior, so that it could not be put to practical use. Moreover, it turned out that the package formed using the cover material of this invention was excellent in the sealing property.

[0030]

As described above, according to the present invention, it is possible to provide a cover material for an aromatic polyester resin container having good easy peelability and punching property, and a package using the cover material. .

Continuation of the front page F term (reference) 3E084 AA24 AB05 AB09 BA08 BA09 FD13 GB08 4C002 AA06 BB08 HH10 4F100 AA00A AA08H AB10 AB33 AK01B AK41A AK51G AT00B BA02 CA23A CB00 DE01A EH172 GB18 J12 LA03 J01 LA03

Claims (2)

[Claims] 1. A lid for sealing an opening of an aromatic polyester resin container, wherein an outermost layer of the lid has a heat sealing layer mainly composed of an aliphatic polyester polymer. The sealing layer is formed by adding inorganic particles having an average particle size of 1 to 10 μm to 5
A lid material for an aromatic polyester-based resin container, comprising 20 parts by weight. 2. A package, wherein the opening of the aromatic polyester resin container is sealed using the lid material for an aromatic polyester resin container according to claim 1.