JP2009241943A - Coating agent and packaging material having dried coating film of the coating agent formed on surface thereof - Google Patents
Coating agent and packaging material having dried coating film of the coating agent formed on surface thereof Download PDFInfo
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本発明は、コート剤及びその乾燥塗膜を表面に有する包装材料に関し、特にヨーグルトを収容する容器の蓋材として有用な包装材料に関する。 The present invention relates to a packaging material having a coating agent and a dry coating film on the surface thereof, and particularly relates to a packaging material useful as a lid for a container containing yogurt.
ヨーグルト、プリン、ゼリー、ジャム、クリーム等を収容する容器の蓋材（包装材料）としては、アルミニウム箔、樹脂フィルム、紙等の包装基材に熱接着層（ヒートシール層）を積層したものが知られている。この場合、包装材料の熱接着層側を容器の開口部に載せて熱接着することで容器を密閉する。 As a lid material (packaging material) for containers containing yogurt, pudding, jelly, jam, cream, etc., a laminate of a thermal adhesive layer (heat seal layer) on a packaging substrate such as aluminum foil, resin film, paper, etc. Are known. In this case, the container is sealed by placing the thermal adhesive layer side of the packaging material on the opening of the container and thermally bonding it.
密閉後、上記食品は一般に輸送や保管に供されるが、その際に内容物が揺れ動いた場合には、包装材料の裏面（熱接着層側）に内容物が付着するという問題がある。内容物が包装材料の裏面に付着すると、開封時に内容物が飛散したり手指が汚れたりするほか、衛生上も好ましいと言えない。そして、このような問題は、流動性の高いヨーグルトを取扱う場合に顕著である。 After the sealing, the food is generally used for transportation and storage. However, when the contents are shaken at that time, there is a problem that the contents adhere to the back surface (thermal adhesive layer side) of the packaging material. If the contents adhere to the back surface of the packaging material, the contents may scatter and the fingers may become dirty at the time of opening, and it may not be preferable for hygiene. And such a problem is remarkable when handling highly fluid yogurt.
そこで、内容物（特にヨーグルト）が付着し難い包装材料について研究されているが、現状では満足のいく包装材料は開発されていない。 Thus, research has been conducted on packaging materials that are difficult to adhere to the contents (especially yogurt), but no satisfactory packaging materials have been developed at present.
本願に関連する技術として、例えば、特許文献１がある。特許文献１にはヨーグルトを収容する容器に適した蓋材が記載されている。
本発明は、特にヨーグルトの付着が抑制された包装材料（特に蓋材）及びそれを得るために用いるコート剤を提供することを目的とする。 An object of the present invention is to provide a packaging material (especially a lid material) in which adhesion of yogurt is particularly suppressed and a coating agent used for obtaining the packaging material.
本発明者は、上記目的を達成すべく鋭意研究を重ねた結果、特定の成分を含有するコート剤を用いる場合には上記目的を達成できることを見出し、本発明を完成するに至った。 As a result of intensive studies to achieve the above object, the present inventor has found that the above object can be achieved when a coating agent containing a specific component is used, and has completed the present invention.
即ち、本発明は、下記のコート剤及び包装材料に関する。
１．ワックス、固体微粒子、界面活性剤及び分散媒を含有するコート剤。
２．前記ワックス、前記固体微粒子及び前記界面活性剤は、いずれも食品添加物として使用可能である、上記項１に記載のコート剤。
３．前記ワックスは、モクロウ、モンタンワックス、キャンデリラ、蜜蝋、カルナバ、マイクロクリスタリン及びパラフィンからなる群から選択される少なくとも１種である、上記項１又は２に記載のコート剤。
４．前記固体微粒子は、平均粒子径が４ｎｍ〜５μｍの親水性シリカである、上記項１〜３のいずれかに記載のコート剤。
５．前記固体微粒子は、前記ワックスにより表面被覆されている、上記項１〜４のいずれかに記載のコート剤。
６．前記界面活性剤のＨＬＢが３〜１６である、上記項１〜５のいずれかに記載のコート剤。
７．包装基材の表面に上記項１〜６のいずれかに記載のコート剤の乾燥塗膜を形成してなる包装材料。
８．前記乾燥塗膜を形成する前記包装基材の表面にホットメルト層を有する、上記項７に記載の包装材料。
９．前記乾燥塗膜の表面に存在する前記ワックスは、鱗片状及び／又は粒状である、上記項７又は８に記載の包装材料。
１０．ヨーグルトを収容する容器の蓋材である、上記項７〜９のいずれかに記載の包装材料。
１１．加熱した包装基材の表面に上記項１〜６のいずれかに記載のコート剤を塗布し、次いで乾燥させる包装材料の製造方法。
以下、本発明のコート剤及び包装材料について詳細に説明する。
That is, the present invention relates to the following coating agent and packaging material.
1. A coating agent containing wax, solid fine particles, a surfactant and a dispersion medium.
2. The coating agent according to Item 1, wherein the wax, the solid fine particles, and the surfactant can all be used as food additives.
3. Item 3. The coating agent according to Item 1 or 2, wherein the wax is at least one selected from the group consisting of molasses, montan wax, candelilla, beeswax, carnauba, microcrystalline, and paraffin.
4). The coating agent according to any one of Items 1 to 3, wherein the solid fine particles are hydrophilic silica having an average particle diameter of 4 nm to 5 μm.
5. Item 5. The coating agent according to any one of Items 1 to 4, wherein the solid fine particles are surface-coated with the wax.
6). Item 6. The coating agent according to any one of Items 1 to 5, wherein the surfactant has an HLB of 3 to 16.
7). A packaging material obtained by forming a dry coating film of the coating agent according to any one of Items 1 to 6 on the surface of a packaging substrate.
8). Item 8. The packaging material according to Item 7, which has a hot melt layer on the surface of the packaging substrate forming the dried coating film.
9. Item 9. The packaging material according to Item 7 or 8, wherein the wax present on the surface of the dried coating film has a scale-like shape and / or a granular shape.
10. Item 10. The packaging material according to any one of Items 7 to 9, which is a lid material for a container containing yogurt.
11. The manufacturing method of the packaging material which apply | coats the coating agent in any one of said item | item 1-6 to the surface of the heated packaging base material, and then dries.
Hereinafter, the coating agent and the packaging material of the present invention will be described in detail.
コート剤
本発明のコート剤は、ワックス、固体微粒子、界面活性剤及び分散媒を含有する。
Coating Agent The coating agent of the present invention contains a wax, solid fine particles, a surfactant and a dispersion medium.
特に上記ワックス、固体微粒子及び界面活性剤としては、何れも食品添加物として使用可能なものを用いることが好ましい。食品添加物として使用可能であれば、コート剤の乾燥塗膜を食品包装の用途に用いる場合に人体への悪影響が殆どない。 In particular, it is preferable to use any of the wax, solid fine particles, and surfactant that can be used as food additives. If it can be used as a food additive, there is almost no adverse effect on the human body when the dried coating film of the coating agent is used for food packaging.
上記ワックスとしては限定されないが、モクロウ、モンタンワックス、キャンデリラ、蜜蝋、カルナバ、マイクロクリスタリン及びパラフィンからなる群から選択される少なくとも１種が好ましい。これらのワックスの中でも、特にモクロウが撥ヨーグルト性能の点で好ましい。よって、ワックスの主成分（第一成分）をモクロウとし、他のワックスを第二成分や第三成分として用いてもよい。 Although it does not limit as said wax, At least 1 sort (s) selected from the group which consists of a moscow, a montan wax, candelilla, beeswax, carnauba, microcrystalline, and paraffin is preferable. Among these waxes, mowl is particularly preferable in terms of yogurt repellent performance. Therefore, the main component (first component) of the wax may be mokuro and other waxes may be used as the second component or the third component.
複数種類のワックスを併用する場合には、例えば、主成分（第一成分）をモクロウとし、第二成分をキャンデリラ、蜜蝋、マイクロクリスタリン及びパラフィンからなる群から選ばれる少なくとも１種とすることが好ましい。この場合、第一成分と第二成分の重量比は、第一成分１００重量部に対して第二成分１〜１０重量部とすることが好ましい。 When a plurality of types of waxes are used in combination, for example, the main component (first component) is preferably moscow, and the second component is preferably at least one selected from the group consisting of candelilla, beeswax, microcrystalline and paraffin. . In this case, the weight ratio of the first component to the second component is preferably 1 to 10 parts by weight of the second component with respect to 100 parts by weight of the first component.
上記固体微粒子としては限定されないが、焼成カルシウム、未焼成カルシウム、ステアリン酸カルシウム、タルク、粉末パルプ、粉末モミガラ、カカオ炭末、親水性シリカ及び疎水性シリカからなる群から選ばれる少なくとも１種が好ましい。これらの固体微粒子の中でも、分散性及び撥ヨーグルト性の点で特に親水性シリカが好ましい。 Although it does not limit as said solid fine particle, At least 1 sort (s) chosen from the group which consists of calcined calcium, uncalcined calcium, calcium stearate, talc, powder pulp, powdered rice bran, cacao charcoal powder, hydrophilic silica, and hydrophobic silica is preferable. Among these solid fine particles, hydrophilic silica is particularly preferable in terms of dispersibility and yogurt repellency.
固体微粒子の平均粒子径は限定されないが、４ｎｍ〜５μｍ程度が好ましく、４ｎｍ〜１００ｎｍ程度がより好ましい。このような範囲であれば、均質なコート剤を得るために適している。 The average particle size of the solid fine particles is not limited, but is preferably about 4 nm to 5 μm, and more preferably about 4 nm to 100 nm. Within such a range, it is suitable for obtaining a uniform coating agent.
上記平均粒子径は、走査型電子顕微鏡（ＳＥＭ）や透過型電子顕微鏡（ＴＥＭ）で固体微粒子を観察することにより測定できる。粒子が球状の場合は、その直径を粒子径とし、粒子５０個の総平均を平均粒子径とする。粒子が非球状の場合は、測定視野（写真）上の各粒子の最長径（平行な２本の線分で粒子を挟み込んだときの最大距離）及び最短径（平行な２本の線分で粒子を挟み込んだときの最短距離）の算術平均を粒子径とし、粒子５０個の粒子径の総平均を平均粒子径とする。 The average particle diameter can be measured by observing solid fine particles with a scanning electron microscope (SEM) or a transmission electron microscope (TEM). When the particles are spherical, the diameter is the particle diameter, and the total average of 50 particles is the average particle diameter. When the particles are non-spherical, the longest diameter (maximum distance when the particles are sandwiched between two parallel line segments) and the shortest diameter (two parallel line segments) The arithmetic average of the shortest distance when the particles are sandwiched) is defined as the particle diameter, and the total average of 50 particle diameters is defined as the average particle diameter.
上記固体微粒子は、上記ワックスにより表面被覆されていることが好ましい。ここで、コート剤中のワックスと固体微粒子の重量比は１０：９０〜７０：３０程度が好ましく、ワックスが少なすぎると固体微粒子の表面を十分に被覆することが困難となり、逆にワックスが多すぎると後記するワックスの微細な鱗片構造や粒状構造が得られ難くなる。 The solid fine particles are preferably surface-coated with the wax. Here, the weight ratio of the wax and the solid fine particles in the coating agent is preferably about 10:90 to 70:30. If the amount of the wax is too small, it becomes difficult to sufficiently cover the surface of the solid fine particles, and conversely, the amount of the wax is large. If it is too large, it becomes difficult to obtain a fine scale structure or granular structure of the wax described later.
上記界面活性剤としては限定されないが、ＨＬＢ（Hydrophile-Lipophile Balance）値（小数点以下は四捨五入）が３〜１６のものが好ましい。ＨＬＢ値が０〜２の場合には分散媒に分散し難くなり、ＨＬＢ値が１７〜２０の場合にはワックスとのなじみが低下し、均質なコート剤が得られ難くなるおそれがある。 Although it does not limit as said surfactant, The thing of 3-16 is preferable for HLB (Hydrophile-Lipophile Balance) value (the decimal point is rounded off). When the HLB value is 0 to 2, it is difficult to disperse in the dispersion medium, and when the HLB value is 17 to 20, familiarity with the wax is lowered, and it may be difficult to obtain a uniform coating agent.
上記３〜１６のＨＬＢ値を有する界面活性剤としては、例えば、グリセリン脂肪酸エステル、ポリグリセリン脂肪酸エステル、ソルビタン脂肪酸エステル、ショ糖脂肪酸エステル及びプロピレングリコール脂肪酸エステルからなる群から選ばれる少なくとも１種が好ましい。界面活性剤の添加量は、固体微粒子１００重量部に対して０．０４〜４０重量部程度が好ましい。 The surfactant having an HLB value of 3 to 16 is preferably at least one selected from the group consisting of glycerin fatty acid ester, polyglycerin fatty acid ester, sorbitan fatty acid ester, sucrose fatty acid ester and propylene glycol fatty acid ester, for example. . The addition amount of the surfactant is preferably about 0.04 to 40 parts by weight with respect to 100 parts by weight of the solid fine particles.
上記分散媒としては限定されないが、シクロヘキサン、アセトン、イソプロピルアルコール（ＩＰＡ）、トルエン、エタノール等が挙げられる。これらの分散媒は単独又は２種以上を混合して使用できる。これらの分散媒の中でも、安全性の点でエタノールが好ましい。分散媒の量はコート剤の固形分濃度や塗布特性に応じて設定する。 Examples of the dispersion medium include, but are not limited to, cyclohexane, acetone, isopropyl alcohol (IPA), toluene, ethanol, and the like. These dispersion media can be used alone or in admixture of two or more. Among these dispersion media, ethanol is preferable from the viewpoint of safety. The amount of the dispersion medium is set according to the solid content concentration of the coating agent and the coating characteristics.
本発明のコート剤は、上記各成分を混合することにより得られる。例えば、ワックスを石油エーテル等の溶媒に溶解し、固体微粒子を添加して撹拌する。この際、固体微粒子とワックスの親和性を向上させるために界面活性剤を添加する。溶液が均一になった後、石油エーテル等の溶媒を加熱等によって除去することにより、ワックスに被覆された固体微粒子が得られる。次いで、ワックスに被覆された固体微粒子を分散媒に分散させることによってコート剤（分散液）が得られる。 The coating agent of this invention is obtained by mixing said each component. For example, wax is dissolved in a solvent such as petroleum ether, and solid fine particles are added and stirred. At this time, a surfactant is added to improve the affinity between the solid fine particles and the wax. After the solution becomes uniform, a solvent such as petroleum ether is removed by heating or the like to obtain solid fine particles coated with wax. Next, a coating agent (dispersion) is obtained by dispersing solid fine particles coated with wax in a dispersion medium.
他の調製方法としては、７０℃前後に加熱したエタノール中にワックスを溶解し、固体微粒子及び界面活性剤を添加して撹拌する。溶液が均一になった後、エタノールを室温付近まで冷却することによってワックスに被覆された固体微粒子が得られる。ここで、ワックスに被覆された固体微粒子は既にエタノール中に分散しているので、このまま又は更にエタノール等の分散媒を追加することによりコート剤（分散液）が得られる。 As another preparation method, wax is dissolved in ethanol heated to around 70 ° C., solid fine particles and a surfactant are added and stirred. After the solution becomes homogeneous, solid fine particles coated with wax are obtained by cooling ethanol to near room temperature. Here, since the solid fine particles coated with the wax are already dispersed in ethanol, a coating agent (dispersion) can be obtained by adding a dispersion medium such as ethanol as it is or further.
包装材料
本発明の包装材料は、包装基材の表面に上記コート剤の乾燥塗膜を形成してなる。
Packaging Material The packaging material of the present invention is formed by forming a dry coating film of the coating agent on the surface of a packaging substrate.
上記包装基材としては限定されないが、例えば、アルミニウム箔、紙、樹脂フィルムやこれらを２種以上積層したラミネート材が挙げられる。また、これらの包装基材には、熱接着層（ヒートシール層）が積層されていてもよい。 Although it does not limit as said packaging base material, For example, the laminate material which laminated | stacked 2 or more types of aluminum foil, paper, a resin film, and these is mentioned. Further, a thermal adhesive layer (heat seal layer) may be laminated on these packaging substrates.
熱接着層は、包装材料をヨーグルト容器等の開口部に熱接着するために用いる。熱接着層としては、公知のシーラントフィルムを始め、ラッカータイプ接着剤、イージーピール接着剤、ホットメルト接着剤等の接着剤からなる層が採用できる。本発明では、これらの熱接着層の中でも、ホットメルト接着剤からなる層（ホットメルト層）が好ましい。 The thermal adhesive layer is used to thermally bond the packaging material to an opening such as a yogurt container. As the thermal adhesive layer, a layer made of an adhesive such as a known sealant film, a lacquer type adhesive, an easy peel adhesive, a hot melt adhesive, and the like can be adopted. In the present invention, among these thermal adhesive layers, a layer made of a hot melt adhesive (hot melt layer) is preferable.
本発明では、コート剤の乾燥塗膜は、包装基材（必要に応じて熱接着層も含む）の内面（容器等の開口部と接する側：即ち裏面側）に形成すればよいが、必要に応じて包装基材の両面に形成してもよい。このように、コート剤の乾燥塗膜を形成することにより、包装材料に優れた撥水性及び撥ヨーグルト性が付与される。 In the present invention, the dry coating film of the coating agent may be formed on the inner surface (the side in contact with the opening of the container or the like: that is, the back surface side) of the packaging base material (including the thermal adhesive layer as necessary). Depending on the case, it may be formed on both sides of the packaging substrate. Thus, by forming a dry coating film of the coating agent, excellent water repellency and yogurt repellency are imparted to the packaging material.
コート剤の乾燥塗膜は、例えば、包装基材の表面にコート剤を塗布し、次いで乾燥させることにより形成する。コート剤の塗布方法は限定されないが、スプレー法が好ましい。また、スプレー法で塗布する際には包装基材（熱接着層を含む）を加熱しておくことが好ましい。加熱下でスプレー塗布することにより、包装基材とコート剤との密着性が向上する。また、乾燥塗膜の表面に存在するワックスが鱗片状及び／又は粒状となることにより、撥水性や撥ヨーグルト性が向上する。加熱温度は熱接着層の溶融開始温度付近が好ましく、具体的には、熱接着層の溶融開始温度±５０℃程度が好ましい。 The dry coating film of the coating agent is formed, for example, by applying the coating agent to the surface of the packaging substrate and then drying it. Although the coating method of a coating agent is not limited, the spray method is preferable. Moreover, when apply | coating by the spray method, it is preferable to heat a packaging base material (a thermal contact bonding layer is included). By spray coating under heating, the adhesion between the packaging substrate and the coating agent is improved. In addition, the water repellency and yogurt repellency are improved by the wax existing on the surface of the dried coating film becoming scaly and / or granular. The heating temperature is preferably near the melting start temperature of the thermal adhesive layer, and specifically, the melting start temperature of the thermal adhesive layer is preferably about ± 50 ° C.
コート剤の厚み（乾燥後の最大厚み）は、０．２μｍ〜１００μｍ程度が好ましく、０．５〜２０μｍ程度がより好ましい。０．２μｍ未満では撥水性や撥ヨーグルト性の効果が不十分になるおそれがある。他方、１００μｍを超えるとコストアップ及び固体微粒子の脱落の可能性があるので避けた方がよい。 The thickness of the coating agent (maximum thickness after drying) is preferably about 0.2 μm to 100 μm, and more preferably about 0.5 to 20 μm. If it is less than 0.2 μm, the effect of water repellency and yogurt repellency may be insufficient. On the other hand, if it exceeds 100 μm, it is better to avoid the increase in cost and the possibility of falling off of solid particles.
コート剤の塗布量は上記厚みに応じて設定すればよいが、乾燥後重量で０．０１〜２０ｇ／ｍ２程度が好ましく、０．４〜１２ｇ／ｍ２がより好ましい。０．０１ｇ／ｍ２未満の場合には撥水性や撥ヨーグルト性の効果が不十分になるおそれがある。他方、２０ｇ／ｍ２を超えるとコストアップ及び固体微粒子の脱落の可能性があるので避けた方がよい。 The coating amount of the coating agent may be set according to the thickness, but is preferably about 0.01 to 20 g / m 2 by weight after drying, and more preferably 0.4 to 12 g / m 2 . If it is less than 0.01 g / m 2 , the effect of water repellency and yogurt repellency may be insufficient. On the other hand, if it exceeds 20 g / m 2 , there is a possibility of cost increase and solid fine particles falling off.
乾燥塗膜に含まれるワックス、特に乾燥塗膜の表面に存在するワックスは、前記の通り、鱗片状及び／又は粒状であることが好ましい。このようなワックスの形状は、包装基材を加熱しながらコート剤を塗布することにより得られ易い。ワックスが鱗片状及び／又は粒状であることにより、ワックスの間隙に空気層が形成され、空気層が水やヨーグルト等の付着防止に効果を奏していると考えられる。 As described above, the wax contained in the dried coating film, particularly the wax present on the surface of the dried coating film, is preferably scaly and / or granular. Such a wax shape is easily obtained by applying the coating agent while heating the packaging substrate. It is considered that when the wax is scaly and / or granular, an air layer is formed in the gap between the waxes, and the air layer is effective in preventing adhesion of water, yogurt and the like.
なお、本発明では鱗片状や粒状は完全に独立した粒の状態のみを言うのではなく、粒が集合した凝集状態又はぶどうの房のような粒どうしが密着した状態のものも含む。乾燥塗膜中には固体微粒子がほぼ全体に分散しており、鱗片状及び／又は粒状のワックス中にも単分散又は凝集状態で固体微粒子が存在する。このような固体微粒子は、乾燥塗膜の微細構造の形成・維持に寄与していると考えられる。 In the present invention, scaly and granular shapes do not only refer to the state of completely independent grains, but also include those in an aggregated state in which grains are aggregated or in a state in which grains such as a bunch of grapes are in close contact. Solid fine particles are dispersed almost entirely in the dried coating film, and the solid fine particles are present in a monodispersed or aggregated state in the scale-like and / or granular wax. Such solid fine particles are considered to contribute to the formation and maintenance of the fine structure of the dried coating film.
本発明の包装材料の使用形態は限定されず、各種袋、容器の蓋材、箱及びカップ等の成形容器、チューブ等の形態で使用できる。本発明では、包装材料の撥水性及び撥ヨーグルト性が優れているため、特にヨーグルトを収容する容器の蓋材として有用である。 The usage form of the packaging material of the present invention is not limited, and can be used in the form of various bags, container lids, molded containers such as boxes and cups, tubes and the like. In the present invention, since the packaging material is excellent in water repellency and yogurt repellency, it is particularly useful as a lid for containers containing yogurt.
本発明のコート剤は、従来の包装材料の表面、特に熱接着層面にごく少量を塗布・乾燥させることで撥水性や撥ヨーグルト性を付与できるため、従来の包装材料の製造工程に、当該塗布工程を追加するだけで本発明の包装材料が得られる。また、実施例で示す通り、ヒートシール強度や封緘強度も従来品と同等又は問題のないレベルを示す。 The coating agent of the present invention can impart water repellency and yogurt repellency by applying and drying a very small amount on the surface of a conventional packaging material, particularly the surface of the thermal adhesive layer. The packaging material of this invention is obtained only by adding a process. Further, as shown in the examples, the heat seal strength and the sealing strength are the same level as the conventional product or a problem-free level.
なお、本発明のコート剤及びその乾燥塗膜は良好な撥水性を発揮するため、包装材料に加えて、家庭用品、台所用品、スポーツ用品、自動車用品、工業用品、清掃用具、化粧品、塗料、被服、繊維、各種シート等の様々な分野に応用することもできる。 In addition, since the coating agent of the present invention and its dry coating film exhibit good water repellency, in addition to packaging materials, household goods, kitchenware, sports goods, automobile goods, industrial goods, cleaning tools, cosmetics, paints, It can also be applied to various fields such as clothing, fibers, and various sheets.
１．本発明のコート剤の乾燥塗膜は、可食性材料（食品添加物）又は人体に影響の無い原材料で構成されているので、万一誤って喫食しても無害である。
２．本発明のコート剤の乾燥塗膜は、包装材料、特に熱性着剤との密着性に優れるため、耐久性に優れ脱落し難い。
３．本発明の包装材料は、撥水性、撥ヨーグルト性に優れ、内容物が付着し難い。
４．本発明のコート剤の乾燥塗膜は、非常に薄い層で良いため、熱接着強度（開封強度、封緘強度）に大きな影響を与えず、実用上問題無いレベルを維持する。
５．本発明のコート剤は、従来の包装材料に適用できるため、汎用性に優れる。
1. Since the dried coating film of the coating agent of the present invention is composed of edible materials (food additives) or raw materials that do not affect the human body, it is harmless if accidentally eaten.
2. Since the dry coating film of the coating agent of the present invention is excellent in adhesiveness with packaging materials, particularly thermal adhesives, it is excellent in durability and hardly falls off.
3. The packaging material of the present invention is excellent in water repellency and yogurt repellency, and the contents are difficult to adhere.
4). Since the dried coating film of the coating agent of the present invention may be a very thin layer, it does not greatly affect the thermal bonding strength (opening strength, sealing strength), and maintains a practically satisfactory level.
5. Since the coating agent of the present invention can be applied to conventional packaging materials, it has excellent versatility.
以下、実施例及び比較例を示して本発明を具体的に説明する。但し、本発明は実施例に限定されない。 Hereinafter, the present invention will be specifically described with reference to Examples and Comparative Examples. However, the present invention is not limited to the examples.
実施例１〜５
＜ヨーグルト容器の蓋材の作製＞
厚み２０μｍのアルミニウム箔（１Ｎ３０、軟質箔）を用意した。片面にポリエチレン（厚み２０μｍ）を押し出し積層した。ポリエチレン上にホットメルト剤（ＷＡＸ：３５重量部、ロジン：３５重量部、エチレン−酢酸ビニル共重合体：３０重量部）を塗布量（乾燥後重量）１５ｇ／ｍ２となるようグラビアホットメルトコートした。これにより、ホットメルト層付きの包装基材を得た。
Examples 1-5
<Preparation of yogurt container lid>
An aluminum foil (1N30, soft foil) having a thickness of 20 μm was prepared. Polyethylene (thickness 20 μm) was extruded and laminated on one side. Gravure hot melt coating so that the amount of hot melt agent (WAX: 35 parts by weight, rosin: 35 parts by weight, ethylene-vinyl acetate copolymer: 30 parts by weight) applied to polyethylene is 15 g / m 2 (weight after drying). did. This obtained the packaging base material with a hot-melt layer.
包装基材を１２０℃に加熱し、ホットメルト層に後記各コート剤をスプレー塗布した。スプレーの条件は、空気圧力：０．６ＭＰａ、ノズルから被塗面までの距離：１２０ｍｍ、処理時間：約１２０秒であり、コート剤の塗布量（乾燥後重量）が約３ｇ／ｍ２となるように設定した。これにより包装基材上にコート剤の乾燥塗膜を形成して蓋材とした。 The packaging substrate was heated to 120 ° C., and each coating agent described later was sprayed onto the hot melt layer. The spray conditions are: air pressure: 0.6 MPa, distance from nozzle to surface to be coated: 120 mm, treatment time: about 120 seconds, and the coating amount (weight after drying) is about 3 g / m 2. Was set as follows. Thus, a dry coating film of the coating agent was formed on the packaging base material to obtain a lid material.
＜コート剤の調製＞
各コート剤に含まれるワックス、固体微粒子及びそれらの重量比を表１に示す。
<Preparation of coating agent>
Table 1 shows the wax, solid fine particles, and weight ratio thereof contained in each coating agent.
それぞれ、ワックス１０ｇを約７０℃に加熱したエタノール１リットルに溶解し、更に親水性シリカ（平均粒子径：１２ｎｍ）４．９〜１０ｇと界面活性剤（ショ糖脂肪酸エステル）０．０２ｇを添加して十分に撹拌混合した。次いで、エタノールを室温付近まで冷却し、ワックスに被覆されたシリカ微粒子を得た。ワックスに被覆されたシリカ微粒子とエタノールの重量比率が約１：６６になるようエタノール量を調整して各コート剤とした。 In each case, 10 g of wax was dissolved in 1 liter of ethanol heated to about 70 ° C., and 4.9 to 10 g of hydrophilic silica (average particle size: 12 nm) and 0.02 g of a surfactant (sucrose fatty acid ester) were added. And mixed thoroughly. Next, ethanol was cooled to near room temperature, and silica fine particles coated with wax were obtained. Each coating agent was prepared by adjusting the amount of ethanol so that the weight ratio of silica fine particles coated with wax to ethanol was about 1:66.
比較例１
コート剤を塗布せず、実施例１で用いた包装基材をそのまま蓋材とした。
Comparative Example 1
Without applying the coating agent, the packaging substrate used in Example 1 was used as a lid as it was.
試験例１
実施例及び比較例で作製した蓋材について下記の試験を行った。
Test example 1
The following tests were conducted on the lid materials produced in Examples and Comparative Examples.
＜転落角＞
協和界面化学製のCONTACT-ANGLE METER CA-DTを使用し、乾燥塗膜を上向きにしたシートサンプル（５０ｍｍ×５０ｍｍ）を水平のステージ上に静置して、水滴（１滴）を至近距離から垂らし、ステージを傾斜させた。
<Tumble angle>
Using CONTACT-ANGLE METER CA-DT made by Kyowa Interface Chemical, leave the sheet sample (50mm x 50mm) with the dry coating facing upward on a horizontal stage, and drop a drop of water (1 drop) from a close range. It was hung and the stage was tilted.
水滴が転げ落ちたときの傾斜角を転落角（°）とした。 The inclination angle when the water droplets fell down was defined as the falling angle (°).
＜接触角＞
純水の接触角を協和界面化学製のCONTACT-ANGLE METER CA-DTで測定した。
<Contact angle>
The contact angle of pure water was measured with CONTACT-ANGLE METER CA-DT manufactured by Kyowa Interface Chemical.
＜撥ヨーグルト性＞
乾燥塗膜を上向きにした水平のシートサンプル（５０ｍｍ×５０ｍｍ）上に、ヨーグルト１滴（約０．４ｇ）を至近距離から垂らし、シートサンプルを３０°傾斜させたときにヨーグルトが転落するかどうか観察した。実施例１及び比較例１におけるシートサンプル上のヨーグルト液滴の状態を図２に示す。
<Yogurt repellent>
Whether a drop of yogurt (approx. 0.4g) hangs down from a close distance on a horizontal sheet sample (50mm x 50mm) with the dried film facing upward, and whether the yogurt falls down when the sheet sample is tilted 30 ° Observed. The state of yogurt droplets on the sheet samples in Example 1 and Comparative Example 1 is shown in FIG.
＜構造＞
ＳＥＭ観察により試料表面のワックスの微細構造を観察した。実施例３の当該ＳＥＭ観察像を図３に示す。
<Structure>
The microstructure of the wax on the sample surface was observed by SEM observation. The SEM observation image of Example 3 is shown in FIG.
＜開封強度＞
フランジ付き紙／ポリエチレン製容器（フランジ幅３ｍｍ、フランジ外径８０ｍｍ、高さ５６ｍｍ；厚み約３００μｍの紙にポリエチレン１００μｍをコーティングしたものをポリエチレンが容器内面側になるよう成形したもの）に各サンプル蓋材をヒートシール（シール温度１５０℃×１ｋｇ／ｃｍ２×１秒）し、１００ｍｍ／ｍｉｎ、４５°剥離（剥離開始点からみて仰角４５°方向に剥離）時の荷重を開封強度（ヒートシール強度）Ｎ／ｃｕｐとした。
<Opening strength>
Each sample lid on a flanged paper / polyethylene container (flange width 3 mm, flange outer diameter 80 mm, height 56 mm; paper of about 300 μm thickness coated with 100 μm polyethylene so that the polyethylene is on the inner side of the container) The material is heat-sealed (sealing temperature 150 ° C. × 1 kg / cm 2 × 1 second), and the load at the time of 100 mm / min, 45 ° peeling (peeling in an elevation angle 45 ° direction from the peeling start point) is the opening strength (heat sealing strength ) N / cup.
＜封緘強度＞
フランジ付き紙／ポリエチレン製容器（上記同様）のフランジ上に各サンプル蓋材をヒートシール（シール温度１５０℃×１ｋｇ／ｃｍ２×１秒）し、〔乳及び乳製品の成分規格等に関する省令（昭和５４年４月１６日厚生省令第１７号）〕の封緘強度試験法に準じて封緘強度試験を行った。但し、容器内に空気を流入しつづけ、空気漏れする時点の内圧を測定した。
<Sealing strength>
Heat seal each sample lid on the flange of a flanged paper / polyethylene container (same as above) (sealing temperature 150 ° C. × 1 kg / cm 2 × 1 second) The sealing strength test was conducted according to the sealing strength test method of April 16, 1979, Ministry of Health and Welfare Ordinance No. 17)]. However, the internal pressure at the time when air continued to flow into the container and air leaked was measured.
以上の評価結果を表２に示す。
＜ヨーグルト付着テスト＞
ヨーグルトを内容積の９０％充填したフランジ付き紙／ポリエチレン製容器（上記同様）のフランジ上に、実施例１及び比較例１の各サンプル蓋材をヒートシール（シール温度１５０℃×１ｋｇ／ｃｍ２×１秒）し、天地逆転させた状態で６０秒間放置した後に開封した状態を図１に示す。
The above evaluation results are shown in Table 2.
<Yogurt adhesion test>
Each sample lid material of Example 1 and Comparative Example 1 was heat-sealed (sealing temperature 150 ° C. × 1 kg / cm 2 ) on the flange of a flanged paper / polyethylene container (same as above) filled with 90% of the internal volume of yogurt. FIG. 1 shows a state in which the container is left for 60 seconds in a state of being inverted upside down for 60 seconds and then opened.
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