WO2010093002A1 - 積層体及び容器 - Google Patents
積層体及び容器 Download PDFInfo
- Publication number
- WO2010093002A1 WO2010093002A1 PCT/JP2010/052025 JP2010052025W WO2010093002A1 WO 2010093002 A1 WO2010093002 A1 WO 2010093002A1 JP 2010052025 W JP2010052025 W JP 2010052025W WO 2010093002 A1 WO2010093002 A1 WO 2010093002A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- layer
- fine particles
- oxide fine
- packaging material
- hydrophobic oxide
- Prior art date
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Images
Classifications
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Definitions
- the present invention relates to a laminate and a container. In particular, it relates to the following technologies.
- the present invention relates to a laminate and a packaging material.
- the present invention relates to a laminate used for waterproof clothing, water-repellent films, water-repellent sheets and the like and packaging materials used for packaging foods, beverages, pharmaceuticals, cosmetics, chemicals and the like.
- this invention relates to a non-adhesive container and its manufacturing method.
- the present invention relates to a container excellent in non-adhesiveness of contents and a manufacturing method thereof. More specifically, the present invention relates to a non-adhesive container for containing foods, beverages, pharmaceuticals, cosmetics, chemicals, and the like, and a method for manufacturing the same. Furthermore, the present invention relates to a packaging material and a manufacturing method thereof. More specifically, the present invention relates to a packaging material used for packaging foods, beverages, pharmaceuticals, cosmetics, chemicals, and the like and a manufacturing method thereof. In particular, the present invention relates to a packaging material excellent in non-adhesiveness of contents. Furthermore, the present invention relates to a packaging material. More specifically, the present invention relates to a packaging material used for packaging foods, beverages, pharmaceuticals, cosmetics, chemicals, and the like. In particular, the present invention relates to a packaging material excellent in non-adhesiveness and oxygen absorption of contents.
- a wide variety of packaging materials and containers are known in the past, but their contents are also diverse.
- foods, beverages, pharmaceuticals, cosmetics, chemicals and the like such as jelly confectionery, pudding, yogurt, liquid detergent, toothpaste, carrero, syrup, petrolatum, face wash cream, face wash mousse and the like.
- properties of the contents such as a solid, a semi-solid, a liquid, a viscous material, a gel-like material, and the like.
- the packaging materials for packaging these contents are required to have hermeticity as well as thermal adhesiveness, light shielding, heat resistance, durability, etc. depending on the contents, packaging form, application, etc.
- packaging materials that satisfy these characteristics have the following problems. That is, there is a problem that the contents adhere to the packaging material. If the contents adhere to the packaging material, it becomes difficult to use up all the contents, resulting in waste. In addition, in order to use up all the contents, the contents attached to the packaging material must be collected separately, which is troublesome. For this reason, the packaging material needs to have a property (non-adhesiveness) that the contents are difficult to adhere to the packaging material in addition to the above-described sealing property and the like.
- the heat seal layer has an anti-adhesion effect, glyceric acid ester, polyglycerin fatty acid ester, pentaerythritol fatty acid. It consists of polyolefin containing ester, polyoxypropylene / polyoxyethylene block polymer, sorbitan fatty acid ester, polyoxyethylene alkyl ether, fatty acid amide, etc., and its thickness is thicker than 10 ⁇ m, between the adhesive layer and the heat seal layer.
- Patent Document 1 proposes a filler adhesion prevention lid material characterized in that an intermediate layer made of polyolefin is provided.
- the surface coating comprises a metal oxide network and a hydrophobic surface.
- the hydrophobic material is uniformly distributed with respect to the thickness of the surface coating, and the surface coating is hydrophobic and has a contact angle with water greater than 90 °.
- Patent Document 1 and Patent Document 2 cannot be said to have sufficient adhesion prevention effects. In this respect, further improvement is necessary for practical use.
- a main object of the present invention is to provide a laminate, a packaging material, and a container that can continuously exhibit non-adhesiveness superior to that of the prior art.
- the present inventor has found that the above object can be achieved by employing a laminate or a packaging material having a specific structure, and has completed the present invention. It was.
- the present invention relates to the following laminate, packaging material, and container.
- Item 3 The laminate according to Item 2, wherein the hydrophobic oxide fine particles form a porous layer having a three-dimensional network structure. 6). Item 3. The laminate according to Item 2, wherein the hydrophobic oxide fine particles have a specific surface area of 50 to 300 m 2 / g by BET method. 7). Item 3. The laminate according to Item 2, wherein the hydrophobic oxide fine particles are hydrophobic silica. 8). Item 8. The laminate according to Item 7, wherein the hydrophobic silica has a trimethylsilyl group on its surface. 9. Item 4. The laminate according to Item 3, wherein the filler particles have an average particle diameter of 0.5 to 100 ⁇ m. 10. A packaging material comprising the laminate according to any one of items 1 to 9. 11.
- a non-adhesive container for containing contents wherein hydrophobic oxide fine particles having an average primary particle diameter of 3 to 100 nm are attached to at least part or all of the surface of the container that comes into contact with the contents.
- 12 Item 12.
- the non-adhesive container according to Item 11, wherein the amount of hydrophobic oxide fine particles attached is 0.01 to 10 g / m 2 .
- 13 Item 12.
- the non-adhesive container according to Item 11, wherein the hydrophobic oxide fine particles form a porous layer having a three-dimensional network structure.
- 14 Item 12.
- the nonadherent container according to Item 11, wherein the hydrophobic oxide fine particles have a specific surface area of 50 to 300 m 2 / g by BET method. 15.
- Item 12 The non-adhesive container according to Item 11, wherein the hydrophobic oxide fine particles are hydrophobic silica. 16.
- Item 16 The non-adhesive container according to Item 15, wherein the hydrophobic silica has a trimethylsilyl group on the surface thereof. 17.
- a method for producing a container for containing contents comprising a step of attaching hydrophobic oxide fine particles having an average primary particle diameter of 3 to 100 nm to at least part or all of the surface of the container that contacts the contents
- a method for producing a non-adhesive container comprising a step.
- a packaging material comprising at least a base material layer and a thermal adhesive layer, wherein the thermal adhesive layer is laminated as an outermost layer on one surface of the packaging material, and the thermal adhesive layer is adjacent to the other layer.
- the packaging material according to Item 20, wherein the amount of hydrophobic oxide fine particles adhered is 0.01 to 10 g / m 2 . 22.
- Item 21. The packaging material according to Item 20, wherein the hydrophobic oxide fine particles form a porous layer having a three-dimensional network structure. 23.
- Item 21. The packaging material according to Item 20, wherein the hydrophobic oxide fine particles have a specific surface area of 50 to 300 m 2 / g by BET method. 24.
- the packaging material according to Item 20, wherein the hydrophobic oxide fine particles are hydrophobic silica.
- 25. The packaging material according to Item 24, wherein the hydrophobic silica has a trimethylsilyl group on its surface. 26. Item 21.
- the packaging material according to Item 20 which is used for a product in which the content is packaged in a packaging material in a state where the content can contact the outermost surface on the thermal adhesive layer side.
- a method for producing a packaging material comprising a laminate having at least a base material layer and a thermal adhesive layer, comprising the step of attaching hydrophobic oxide fine particles having an average primary particle diameter of 3 to 100 nm to the surface of the thermal adhesive layer Manufacturing method of packaging material.
- a packaging material comprising at least a base material layer and a thermal adhesive layer, wherein the thermal adhesive layer is laminated as an outermost layer on one surface of the packaging material, and the thermal adhesive layer is adjacent to the other layer.
- a lid material in which hydrophobic oxide fine particles having an average primary particle diameter of 3 to 100 nm are attached to the outermost surface that is not formed, and the hydrophobic oxide fine particles form a porous layer having a three-dimensional network structure.
- Bags and molded containers in which hydrophobic oxide fine particles having an average primary particle diameter of 3 to 100 nm are attached to the outermost surface that is not formed, and the hydrophobic oxide fine particles form a porous layer having a three-dimensional network structure A packaging material used as a packaging sheet or tube.
- a packaging material comprising a laminate having at least a base material layer and a thermal adhesive layer, wherein the thermal adhesive layer is laminated as an outermost layer on one side of the packaging material, and at least the base material layer and the thermal adhesive layer
- a packaging material comprising an oxygen absorbent on one side and hydrophobic oxide fine particles having an average primary particle diameter of 3 to 100 nm adhering to the outermost surface where the thermal adhesive layer is not adjacent to other layers.
- the packaging material according to Item 31, wherein the amount of hydrophobic oxide fine particles adhered is 0.01 to 10 g / m 2 . 33.
- Item 32. The packaging material according to Item 31, wherein the hydrophobic oxide fine particles form a porous layer having a three-dimensional network structure. 34.
- Item 32. The packaging material according to Item 31, wherein the hydrophobic oxide fine particles have a specific surface area of 50 to 300 m 2 / g by BET method. 35.
- Item 32. The packaging material according to Item 31, wherein the hydrophobic oxide fine particles are hydrophobic silica.
- 36. The packaging material according to Item 35, wherein the hydrophobic silica has a trimethylsilyl group on its surface. 37. Item 32.
- the laminate and the packaging material of the first invention can exhibit good water repellency and non-adhesiveness (or antifouling property).
- a layer containing a thermoplastic resin hereinafter also referred to as “thermoplastic resin layer” contains filled particles containing at least one of an organic component and an inorganic component, the hydrophobic oxide fine particles are removed.
- thermoplastic resin layer contains filled particles containing at least one of an organic component and an inorganic component
- thermoplastic resin layer when used as a thermal adhesive layer, excellent non-adhesiveness is continuously exhibited while maintaining good thermal adhesiveness. Can do. That is, high non-adhesiveness can be obtained without impeding the thermal adhesiveness practically without being restricted by the type and thickness of the thermal adhesive layer. More specifically, at the time of thermal bonding, the hydrophobic oxide fine particles existing on the heat-bonded region are embedded in the heat-bonding layer and thus do not inhibit the heat-bonding, but exist outside the heat-bonded region. Since the hydrophobic oxide fine particles are held on the thermal adhesive layer as they are, their high non-adhesiveness can be exhibited.
- Such laminates include, for example, tablecloths, napkins, aprons, table covers, floor mats, wall cloths, wallpaper, labels, release paper, tags, chair covers, tarpaulins, umbrellas, ski wear, building materials, bed covers, It can be suitably used for shoe surface materials, shoe covers, waterproof clothing, water repellent films, water repellent sheets and the like.
- this laminated body can be suitably used as a packaging material for packaging foods, beverages, pharmaceuticals, cosmetics, chemicals and the like as they are or by processing them.
- the non-adhesive container of the second invention can exhibit excellent non-adhesiveness without containing a concern substance such as fluorine. Thereby, since almost all the contents can be taken out from the container, the loss of the amount adhering to the inner wall of the container can be suppressed or prevented.
- the hydrophobic oxide fine particles it is only necessary to apply the hydrophobic oxide fine particles to at least a part of the surface in contact with the contents, so that it is not necessary to go through a complicated process, and the production efficiency, This is advantageous in terms of cost.
- limiting of the material of a container For example, it can apply also to containers of any materials, such as a glass container, earthenware, a paper container, a plastic container, a metal container, and a wooden container.
- non-adhesiveness can be imparted to existing containers later.
- non-adhesiveness can be further maintained by heat-treating after applying the hydrophobic oxide fine particles.
- the packaging material of the third invention can exhibit excellent non-adhesiveness while maintaining good thermal adhesiveness. That is, high non-adhesiveness can be obtained without impeding the thermal adhesiveness practically without being restricted by the type and thickness of the thermal adhesive layer. More specifically, at the time of thermal bonding, the hydrophobic oxide fine particles existing on the heat-bonded region are embedded in the heat-bonding layer and thus do not inhibit the heat-bonding, but exist outside the heat-bonded region. Since the hydrophobic oxide fine particles are held on the thermal adhesive layer as they are, their high non-adhesiveness can be exhibited.
- the thermal bonding can be performed only by attaching the hydrophobic oxide fine particles to the entire surface without considering the bonding margin to the thermal bonding layer.
- Such packaging materials can be used as lidding materials, and are effective for various uses such as pillow bags, gusset bags, self-supporting bags, three-side seal bags, four-side seal bags, etc., molded containers, packaging sheets, tubes, etc. Can be used.
- the packaging material of the fourth invention can exhibit excellent non-adhesiveness and oxygen absorbability while maintaining good thermal adhesiveness. That is, high non-adhesiveness can be obtained without impeding the thermal adhesiveness practically without being restricted by the type and thickness of the thermal adhesive layer. More specifically, at the time of thermal bonding, the hydrophobic oxide fine particles existing on the heat-bonded region are embedded in the heat-bonding layer and thus do not inhibit the heat-bonding, but exist outside the heat-bonded region. Since the hydrophobic oxide fine particles are held on the thermal adhesive layer as they are, their high non-adhesiveness can be exhibited.
- the oxygen absorbent particles exhibit desired oxygen absorption performance while avoiding falling off due to contact of contents and the like. be able to.
- the layer composed of the hydrophobic oxide fine particles formed on the thermal bonding layer is formed in a porous shape (that is, when a porous layer is formed)
- it has high non-adhesiveness Higher oxygen absorption performance can be exhibited.
- oxygen remaining in the package or oxygen generated from the contents can penetrate through the porous layer and reach the oxygen absorbent contained in the thermal adhesive layer or the like more reliably.
- oxygen can be more effectively absorbed and removed by the oxygen absorbent, and high non-adhesiveness can be exhibited by forming the porous layer.
- Such packaging materials can be used as lidding materials, and are effective for various uses such as pillow bags, gusset bags, self-supporting bags, three-side seal bags, four-side seal bags, etc., molded containers, packaging sheets, tubes, etc. Can be used.
- FIG. 3 It is a schematic diagram of the cross-sectional structure of an example of the laminated body of 1st invention. It is a schematic diagram of the cross-sectional structure of the packaging body produced using the laminated body of 1st invention as a cover material of a container. The cross-sectional observation photograph of a part of the packaging material of Example 1-4 is shown.
- “Lotus surface” indicates “the surface of a porous layer having a three-dimensional network structure of hydrophobic oxide fine particles”.
- FIG. 1 It is a schematic diagram of a cross-sectional structure showing a state in which contents are put into a non-adhesive container of the second invention and a lid member is thermally bonded.
- FIG. 1 It is a schematic diagram of the cross-sectional structure of the packaging material of 3rd invention.
- FIG. 1 It is a schematic diagram of the cross-sectional structure of the packaging material of 3rd invention.
- FIG. 1 It is a schematic diagram of the cross-sectional structure of the package manufactured using the packaging material of 3rd invention as a cover material of a container.
- FE Field Emission
- FIG. 1 It is a schematic diagram of the cross-sectional structure of the packaging material which concerns on one Embodiment of 4th invention.
- the first to fourth inventions basically have a non-adhesive laminate in which hydrophobic oxide fine particles having an average primary particle diameter of 3 to 100 nm are attached to at least a part of the outermost surface.
- the hydrophobic oxide fine particles form a porous layer having a three-dimensional network structure. Thereby, water repellency or non-adhesiveness can be exhibited more effectively.
- the first to fourth inventions will be described individually.
- the laminate of the first invention is a hydrophobic oxide having an average primary particle diameter of 3 to 100 nm on at least part of the surface of a layer containing a thermoplastic resin (hereinafter also referred to as “thermoplastic resin layer”). It is characterized by adhering fine particles.
- FIG. 1 shows a schematic diagram of a cross-sectional structure of an example of the laminate of the first invention.
- hydrophobic oxide fine particles 3 having an average primary particle diameter of 3 to 100 nm are attached to the surface of a thermoplastic resin layer 2 in which a base material layer 1 includes filler particles 6.
- the thermoplastic resin layer 2 is laminated on one outermost layer of the packaging material (laminate).
- hydrophobic oxide fine particles 3 having an average primary particle diameter of 3 to 100 nm are formed on the surface (outermost surface) that is not adjacent to the other layer (the base material layer in FIG. 1). It is attached. Hydrophobic oxide fine particles 3 are adhered and fixed to the thermoplastic resin layer 2.
- the hydrophobic oxide fine particles 3 may contain primary particles, but it is desirable that the hydrophobic oxide fine particles 3 contain many aggregates (secondary particles).
- the hydrophobic oxide fine particles form a porous layer having a three-dimensional network structure. That is, it is preferable that a porous layer having a three-dimensional network structure formed of hydrophobic oxide fine particles is laminated on the thermoplastic resin layer 2.
- the surface of the thermoplastic resin layer (surface on which the hydrophobic oxide fine particles adhere) becomes uneven in the cross section, and the recesses are hydrophobic. It is considered that the non-adhesiveness is maintained for a long period of time when the conductive oxide fine particles enter in an aggregated state. That is, in addition to the contents, the hydrophobic oxide fine particles that have entered the concave portion enter the concave portion and maintain the fixed state even when contact with the device or apparatus in the process occurs. As a result of effectively suppressing or preventing the falling off of the fine particles, excellent non-adhesiveness can be exhibited continuously. In other words, good non-adhesiveness can be exhibited over a relatively long period.
- FIG. 2 shows a schematic view of a cross-sectional structure of a package produced using the laminate of the first invention as a container lid.
- the notation of the hydrophobic oxide fine particles 3 and the filler particles 6 is omitted.
- the container 4 is filled with the contents 5 and sealed in such a state that the opening and the thermoplastic resin layer 2 of the laminate are in contact with each other. That is, the laminate (packaging material) of the present invention is used in a state where the hydrophobic oxide fine particles adhering to the thermoplastic resin layer 2 can come into contact with the contents 5.
- thermoplastic resin layer 2 is protected by the hydrophobic oxide fine particles and has excellent non-adhesiveness, even if the contents are in contact with the vicinity of the thermoplastic resin layer 2 (approaching) Even so, adhesion of the contents to the thermoplastic resin layer is blocked and repelled by the hydrophobic oxide fine particles (or a porous layer made of hydrophobic oxide fine particles). For this reason, the content does not remain in the vicinity of the thermoplastic resin layer, but is repelled by hydrophobic oxide fine particles (or a porous layer made of hydrophobic oxide fine particles) and the content is placed in the container.
- a material of the container 4 it can select suitably from a metal, a synthetic resin, glass, paper, those composite materials, etc., The kind of a thermoplastic resin layer, a component, etc. can be adjusted suitably according to the material.
- thermoplastic resin layer
- thermoplastic resin acrylic resin, polystyrene, ABS resin, vinyl chloride resin, polyethylene resin, polypropylene resin, polyamide resin, polycarbonate, polyacetal, fluorine resin, silicone resin, polyester resin, and blended resins of these Copolymers, modified resins and the like containing combinations of monomers to be used can be used.
- the thickness of the thermoplastic resin layer is not particularly limited, but is preferably about 0.01 ⁇ m to 5 mm, more preferably about 0.01 ⁇ m to 2 mm from the viewpoint of productivity, cost, and the like.
- the thickness is preferably 1 to 150 ⁇ m in consideration of thermal adhesiveness.
- the hydrophobic oxide fine particles present on the region to be thermally bonded are embedded in the thermoplastic resin layer, and the thermoplastic resin layer becomes the outermost surface. Gluing can be performed. For this reason, it is desirable to set the thickness within the above thickness range so that the hydrophobic oxide fine particles can be embedded in the thermoplastic resin layer as much as possible.
- the content of the thermoplastic resin in the thermoplastic resin layer varies depending on the type of the thermoplastic resin, the presence or absence of filler particles and other additives, but is usually 20 to 100% by weight, particularly 30 to 99% by weight. %, More preferably 50 to 99% by weight.
- thermoplastic resin for the purpose of reinforcing a thermoplastic resin (layer) or imparting other properties (moisture permeability resistance, oxygen permeability resistance, light shielding property, heat insulating property, impact resistance, etc.) as necessary.
- a base material layer another layer (referred to as a base material layer) can be laminated on the thermoplastic resin (layer).
- a base material layer usually, a three-layer structure in which a base material layer / thermoplastic resin layer / hydrophobic oxide fine particles are sequentially laminated as shown in FIG.
- a well-known material can be employ
- the composite material / laminate material can be suitably used.
- the base layer may be formed by laminating each layer employed in known packaging materials, building materials, clothing materials, daily necessities, etc. at an arbitrary position.
- a printing layer a printing protective layer (so-called OP layer), a colored layer, an adhesive layer, an adhesion reinforcing layer, a primer coat layer, an anchor coat layer, an anti-slip agent layer, a lubricant layer, an anti-fogging agent layer and the like can be mentioned.
- the method for laminating the base material layer and the method for laminating the base material layer and the thermoplastic resin layer are not limited.
- a known method such as a dry laminating method, an extrusion laminating method, a wet laminating method, or a heat laminating method should be adopted. Can do.
- thermoadhesive material When making a thermoplastic resin layer function as a thermoadhesive layer, a well-known thermoadhesive material can be employ
- a layer formed of an adhesive such as a lacquer type adhesive, an easy peel adhesive, or a hot melt adhesive
- the thermoplastic resin includes a known thermal adhesive containing a resin component.
- a lacquer type adhesive or a hot melt adhesive it is preferable to employ a lacquer type adhesive or a hot melt adhesive, and particularly a thermal adhesive layer formed of a lacquer type adhesive can be suitably employed.
- the filled particles can be contained in the thermoplastic resin layer as necessary. By dispersing the filler particles in the thermoplastic resin layer, more excellent wear resistance and the like can be imparted to the thermoplastic resin layer.
- filler particles containing at least one of an organic component and an inorganic component can be employed.
- inorganic components include 1) metals such as aluminum, copper, iron, titanium, silver, and calcium, or alloys or intermetallic compounds containing these metals, and 2) silicon oxide, aluminum oxide, zirconium oxide, titanium oxide, iron oxide, and the like. Oxides, 3) inorganic acid salts or organic acid salts such as calcium phosphate and calcium stearate, 4) glass, 5) ceramics such as aluminum nitride, boron nitride, silicon carbide and silicon nitride can be suitably used.
- organic components examples include acrylic resins, urethane resins, melamine resins, amino resins, epoxy resins, polyethylene resins, polystyrene resins, polypropylene resins, polyester resins, cellulose resins, vinyl chloride resins, and polyvinyl resins.
- Organic polymer components such as alcohol, ethylene-vinyl acetate copolymer, ethylene-vinyl alcohol copolymer, ethylene-ethyl acrylate copolymer, polyacrylonitrile, and polyamide can be suitably used.
- particles containing both an inorganic component and an organic component can be used in addition to particles made of an inorganic component or particles made of an organic component.
- the average particle size of the filled particles is preferably about 0.5 to 100 ⁇ m, more preferably 1 to 50 ⁇ m, and most preferably 5 to 30 ⁇ m. If it is less than 0.5 ⁇ m, it is unsuitable in terms of handleability, the above-described formation of irregularities, and the like. On the other hand, when exceeding 100 micrometers, it is unsuitable at points, such as drop-off
- the shape of the filled particles is not limited, and may be any of spherical shape, spheroid shape, indefinite shape, teardrop shape, flat shape, hollow shape, porous shape, and the like.
- the content of the filler particles in the thermoplastic resin layer can be appropriately changed according to the kind of the thermoplastic resin or filler particles, desired physical properties, etc., but is generally preferably 1 to 80% by weight based on the weight of the solid content. More preferably, it is 3 to 50% by weight.
- the method of containing the filler particles is not particularly limited, but generally, a method of blending the filler particles with a raw material (composition containing a thermoplastic resin) for forming a thermoplastic resin layer can be mentioned.
- the mixing method may be either dry mixing or wet mixing.
- the main component of the thermoplastic resin layer is 1) a thermoplastic resin or a monomer or oligomer constituting the thermoplastic resin, 2) a solvent, 3) a cross-linking agent, etc., if necessary. What is necessary is just to add and mix.
- the hydrophobic oxide fine particles adhering to the thermoplastic resin layer usually have an average primary particle size of 3 to 100 nm, preferably 5 to 50 nm, more preferably 5 to 20 nm.
- the hydrophobic oxide fine particles are in an appropriate aggregated state, and can hold a gas such as air in the voids in the aggregate, resulting in excellent non-adhesiveness. Obtainable. That is, since this aggregated state is maintained even after adhering to the thermoplastic resin layer, excellent non-adhesiveness can be exhibited.
- the hydrophobic oxide fine particles can be attached to one side or both sides of the thermoplastic resin (layer).
- the average primary particle diameter can be measured with a scanning electron microscope (FE-SEM), and when the resolution of the scanning electron microscope is low, the transmission electron microscope or the like is used.
- An electron microscope may be used in combination.
- the particle shape is spherical
- the diameter is considered as the diameter
- the particle shape is non-spherical
- the average value of the longest diameter and the shortest diameter is regarded as the diameter, and 20 arbitrarily selected by observation with a scanning electron microscope or the like.
- the average diameter of the particles is defined as the average primary particle diameter.
- the specific surface area (BET method) of the hydrophobic oxide fine particles is not particularly limited, but is usually 50 to 300 m 2 / g, particularly preferably 100 to 300 m 2 / g.
- the hydrophobic oxide fine particles are not particularly limited as long as they have hydrophobicity, and may be those hydrophobized by surface treatment.
- fine particles in which hydrophilic oxide fine particles are subjected to a surface treatment with a silane coupling agent or the like to make the surface state hydrophobic can also be used.
- the type of oxide is not limited as long as it has hydrophobicity.
- at least one of silica (silicon dioxide), alumina, titania and the like can be used. These may be known or commercially available.
- silica product names “AEROSIL R972”, “AEROSIL R972V”, “AEROSIL R972CF”, “AEROSIL R974”, “AEROSIL RX200”, “AEROSIL RY200” (above, manufactured by Nippon Aerosil Co., Ltd.), “AEROSIL R202” “AEROSIL R805", “AEROSIL R812”, “AEROSIL R812S” (above, manufactured by Evonik Degussa).
- titania include the product name “AEROXIDE TiO 2 T805” (Evonik Degussa).
- alumina include fine particles in which the product name “AEROXIDE Alu C” (manufactured by Evonik Degussa) or the like is treated with a silane coupling agent to make the particle surface hydrophobic.
- hydrophobic silica fine particles can be preferably used.
- hydrophobic silica fine particles having a trimethylsilyl group on the surface are preferable in that better non-adhesiveness can be obtained.
- commercially available products corresponding to this include “AEROSIL R812” and “AEROSIL R812S” (both manufactured by Evonik Degussa).
- the adhesion amount (weight after drying) of the hydrophobic oxide fine particles to be adhered to the thermoplastic resin layer is not limited, but is usually preferably 0.01 to 10 g / m 2, and preferably 0.2 to 1.5 g / m 2. m 2 is more preferable, and 0.2 to 1 g / m 2 is most preferable. By setting within the above range, more excellent non-adhesiveness can be obtained over a long period of time, and it is further advantageous in terms of suppression of falling off of hydrophobic oxide fine particles, cost, and the like.
- the hydrophobic oxide fine particles adhering to the thermoplastic resin layer preferably form a porous layer having a three-dimensional network structure, and the thickness is preferably about 0.1 to 5 ⁇ m, and 0.2 to 2 More preferably, it is about 5 ⁇ m.
- the layer can contain a lot of air, and more excellent non-adhesiveness can be exhibited.
- the hydrophobic oxide fine particles may be attached to the entire surface of the thermoplastic resin layer (the entire surface on the side opposite to the base material layer side), or a region where the thermoplastic resin layer is thermally bonded (so-called adhesion). You may adhere to the area
- adhesion even when adhering to the entire surface of the thermoplastic resin layer, most or all of the hydrophobic oxide fine particles present on the region to be thermally bonded are buried in the thermoplastic resin layer, so that thermal adhesion is achieved. It is not obstructed, and it is desirable that it adheres to the entire surface of the thermoplastic resin layer even in industrial production.
- the laminate of the first invention can be used for various other uses as it is or after being processed. Other uses are not limited as long as non-adhesiveness, antifouling properties, water repellency, etc. are required.
- table cloth, napkin, apron, table cover, floor mat, wall cloth, wallpaper, label , Release paper, tag, chair cover, waterproof sheet, umbrella, ski wear, building material, bed cover, shoe surface material, shoe cover, waterproof clothing, water repellent film, water repellent sheet, and the like.
- the laminate (packaging material) of the first invention is, for example, a method for producing a laminate or packaging material having at least a thermoplastic resin layer, which is primary on the surface of the thermoplastic resin layer. It can be suitably obtained by a production method including a step of attaching hydrophobic oxide fine particles having an average particle diameter of 3 to 100 nm (hereinafter also referred to as “attachment step”).
- the thermoplastic resin layer can be used as it is if it is in the form of a film or a sheet.
- a known substrate layer can be laminated according to a known method. For example, with respect to a laminated material produced by a single layer base material or a dry laminating method, an extrusion laminating method, a wet laminating method, a heat laminating method, etc. What is necessary is just to form a thermoplastic resin layer by the method demonstrated in (4).
- the filler particles may be previously contained in the raw material for forming the thermoplastic resin layer as described above.
- the method for carrying out the step of attaching the hydrophobic oxide fine particles is not particularly limited.
- known methods such as roll coating, gravure coating, bar coating, doctor blade coating, brush coating, and powder electrostatic coating can be employed.
- the adhesion step can be performed by a method of drying after forming a coating film on the thermoplastic resin layer using a dispersion obtained by dispersing hydrophobic oxide fine particles in a solvent. .
- the solvent in this case is not limited, and in addition to water, for example, alcohol (ethanol), cyclohexane, toluene, acetone, IPA, propylene glycol, hexylene glycol, butyl diglycol, pentamethylene glycol, normal pentane, normal hexane, hexyl alcohol
- An organic solvent such as can be selected as appropriate.
- a very small amount of a dispersant, a colorant, an anti-settling agent, a viscosity modifier and the like can be used in combination.
- the dispersion amount of the hydrophobic oxide fine particles in the solvent is usually about 10 to 100 g / L.
- drying either natural drying or forced drying (heat drying) may be used, but industrially forced drying is preferable.
- the drying temperature is not limited as long as it does not affect the thermoplastic resin layer, but is usually 150 ° C. or less, and preferably 80 to 120 ° C.
- the laminate can also be heated during and / or after the attaching step.
- the adhesion force (fixing force) of the hydrophobic oxide fine particles to the thermoplastic resin layer can be further increased.
- the heating temperature T in this case can be appropriately set according to the type of the thermoplastic resin layer and the like, and usually Tm-50 ⁇ T ⁇ with respect to the melting point Tm (melting start temperature) ° C. of the thermoplastic resin layer used. A range of Tm + 50 is preferable.
- the laminated body thus obtained can be used as a packaging material as it is or after being processed.
- the same method as in the case of a known packaging material can be adopted. For example, embossing, half-cutting, notching, etc. may be performed.
- Non-adhesive container of the second invention is a container for containing the contents, and the hydrophobic particles having an average primary particle diameter of 3 to 100 nm on at least part or all of the surface where the container contacts the contents. It is characterized by adhering fine oxide particles.
- the container body of the second invention is not limited as long as it can accommodate the contents, and a known or commercially available product can be used.
- the material is not limited, and any material such as a glass container, ceramics, paper container, plastic container, metal container, wood container, or a container made of a composite material of two or more of these may be used.
- the form of the container body is a known form such as a dish shape, tray shape, bag shape, cup shape, bottle shape, pan shape, box shape, barrel shape, substantially cylindrical shape, wrapping paper (packaging leaf), etc. There may be.
- the container main body can use the container which consists of a molded object suitably.
- the container which consists of a molded object of paper, a plastics, or a metal can be mentioned.
- the container comprised from the laminated material containing the layer which consists of a rigid material can also be illustrated.
- the non-adhesive container is preferably “a packaging material comprising a laminate having at least a base material layer and a thermal adhesive layer, wherein the thermal adhesive layer is an outermost layer on one surface of the packaging material.
- the non-adhesive container of the second invention is characterized in that hydrophobic oxide fine particles having an average primary particle diameter of 3 to 100 nm are attached to at least part or all of the surface of the container that contacts the contents.
- the hydrophobic oxide fine particles may be attached to the surface of the container body that is not in contact with the contents, or may be attached to the entire surface of the container (including the entire surface that does not contact the contents). There is no problem. Moreover, you may adhere to a part of surface which contacts the contents, and you may adhere to all the said surfaces (entire surface).
- the hydrophobic oxide fine particles adhering to the non-adhesive container of the second invention are hardly recognizable with the naked eye and are therefore transparent or translucent. For this reason, when a transparent glass container or a nearly transparent plastic container is employed as the container body, the transparency can be maintained even after the hydrophobic oxide fine particles are adhered.
- the pattern, the pattern, or the like can be visually recognized through hydrophobic oxide fine particles (or a layer thereof).
- a laminate including a thermoplastic resin layer containing the filler particles in the first invention can be employed. That is, it is a container composed of a laminate including a thermoplastic resin layer containing filled particles, and the hydrophobic oxide fine particles are attached to at least part or all of the surface of the container that contacts the contents.
- the invention characterized by the above is also included.
- Such a container uses, for example, a thermoplastic resin containing pre-filled particles in a portion to which hydrophobic oxide fine particles are adhered, for example, by a method such as in-mold molding, coating, spraying, spraying, transferring, fitting, and bonding.
- a method such as in-mold molding, coating, spraying, spraying, transferring, fitting, and bonding.
- the thermoplastic resin and the filler particles can have the same configuration as described in the first invention. That is, the same thermoplastic resin (layer) and filled particles as described in the first invention can be used, and those within the preferable range described in the first invention can be preferably used. .
- region which forms the thermoplastic resin layer containing a filling particle is not specifically limited.
- it may be any of 1) a region to which the hydrophobic oxide fine particles are attached, 2) a region including a portion to which the hydrophobic oxide fine particles are not attached, and 3) the entire surface of the container (the entire inner surface).
- FIG. 4 shows a schematic diagram of the cut surface structure of the non-adhesive container of the second invention.
- hydrophobic oxide fine particles 3 having an average primary particle diameter of 3 to 100 nm are attached to the surface (bottom surface and part of the side surface) of the container main body 4 that accommodates the contents.
- the hydrophobic oxide fine particles 3 are adhered and fixed to the container body 4. That is, even if the hydrophobic oxide fine particles and the content come into contact with each other, the hydrophobic oxide fine particles are adhered to such an extent that they do not fall off.
- the hydrophobic oxide fine particles 3 may contain primary particles, but it is desirable that the hydrophobic oxide fine particles 3 contain many aggregates (secondary particles).
- the hydrophobic oxide fine particles form a porous layer having a three-dimensional network structure. That is, it is preferable that a porous layer having a three-dimensional network structure formed of hydrophobic oxide fine particles is laminated on at least a part of the surface of the container body 4.
- FIG. 5 shows a schematic diagram of a cross-sectional structure of a product in which the non-adhesive container of the second invention is filled with the contents and the contents are sealed by thermally bonding the lid material.
- the hydrophobic oxide fine particles 3 are omitted.
- the container 4 is filled with the contents 5 and is sealed in a state where the opening and the thermal adhesive layer 2 of the lid are in contact with each other.
- the hydrophobic oxide fine particles present on the heat-bonded region are present in the heat-adhesive layer when thermally bonded. It is embedded, and the thermal bonding layer and the container body 4 are in direct contact, and thermal bonding can be performed.
- the material of the container body 4 is a thermoplastic plastic, it can be welded to a lid made of the same kind of plastic, for example.
- the material of the lid member is not particularly limited, and a known material or a laminated material can be adopted, and may be appropriately selected according to the material and required characteristics of the container body 4.
- a simple substance such as paper, synthetic paper, a resin film, a resin film with a vapor deposition layer, an aluminum foil, or a composite material / laminated material thereof can be suitably used.
- each layer employed in a known lid material may be laminated at an arbitrary position.
- printing layer printing protective layer (so-called OP layer), colored layer, thermal adhesive layer, adhesive layer, adhesion reinforcing layer, primer coat layer, anchor coat layer, anti-slip agent layer, lubricant layer, anti-fogging agent layer, etc.
- OP layer printing protective layer
- colored layer thermal adhesive layer
- adhesive layer adhesion reinforcing layer
- primer coat layer primer coat layer
- anchor coat layer anti-slip agent layer
- anti-fogging agent layer lubricant layer
- anti-fogging agent layer etc.
- cover material is used, it is not limited to this, The thing of another well-known type can also be employ
- a fitting lid, a screw lid, a wrap film, a heat shrinkable film, a caulking lid, a cap, and the like can be appropriately selected.
- hydrophobic oxide fine particles can be attached to the inner surface and / or the outer surface of these lid members.
- the hydrophobic oxide fine particles adhering to the container body 4 usually have an average primary particle diameter of 3 to 100 nm, preferably 5 to 50 nm, more preferably 5 to 20 nm.
- the hydrophobic oxide fine particles are in an appropriate aggregated state, and can hold a gas such as air in the voids in the aggregate, resulting in excellent non-adhesiveness. Obtainable. That is, this agglomerated state is maintained even after adhering to the container body, so that excellent non-adhesiveness can be exhibited.
- the average primary particle diameter can be measured with a scanning electron microscope (FE-SEM).
- FE-SEM scanning electron microscope
- the resolution of the scanning electron microscope is low, the transmission electron microscope or the like is used.
- An electron microscope may be used in combination.
- the particle shape is spherical, the diameter is considered as the diameter, and when the particle shape is non-spherical, the average value of the longest diameter and the shortest diameter is regarded as the diameter, and 20 arbitrarily selected by observation with a scanning electron microscope or the like.
- the average diameter of the particles is defined as the average primary particle diameter.
- the specific surface area (BET method) of the hydrophobic oxide fine particles is not particularly limited, but is usually 50 to 300 m 2 / g, particularly preferably 100 to 300 m 2 / g.
- the hydrophobic oxide fine particles are not particularly limited as long as they have hydrophobicity, and may be those hydrophobized by surface treatment.
- fine particles in which hydrophilic oxide fine particles are subjected to a surface treatment with a silane coupling agent or the like to make the surface state hydrophobic can also be used.
- the type of oxide is not limited as long as it has hydrophobicity.
- at least one of silica (silicon dioxide), alumina, titania and the like can be used. These may be known or commercially available.
- silica product names “AEROSIL R972”, “AEROSIL R972V”, “AEROSIL R972CF”, “AEROSIL R974”, “AEROSIL RX200”, “AEROSIL RY200” (above, manufactured by Nippon Aerosil Co., Ltd.), “AEROSIL R202” “AEROSIL R805", “AEROSIL R812”, “AEROSIL R812S” (above, manufactured by Evonik Degussa).
- titania include “AEROXIDE TiO 2 T805” (manufactured by Evonik Degussa).
- alumina include fine particles in which the product name “AEROXIDE Alu C” (manufactured by Evonik Degussa) is treated with a silane coupling agent to make the particle surface hydrophobic.
- hydrophobic silica fine particles can be preferably used.
- hydrophobic silica fine particles having a trimethylsilyl group on the surface are preferable in that better non-adhesiveness can be obtained.
- commercially available products corresponding to this include “AEROSIL R812” and “AEROSIL R812S” (both manufactured by Evonik Degussa).
- the amount (weight after drying) of the hydrophobic oxide fine particles to be adhered to the container body is not limited, but is usually preferably 0.01 to 10 g / m 2 and preferably 0.2 to 1.5 g / m 2. More preferred is 0.3 to 1 g / m 2 .
- the hydrophobic oxide fine particles adhering to the container body 4 preferably form a porous layer having a three-dimensional network structure, and the thickness is preferably about 0.1 to 5 ⁇ m, and 0.2 to 2. More preferably, it is about 5 ⁇ m. By adhering in such a porous layer state, the layer can contain a lot of air, and more excellent non-adhesiveness can be exhibited.
- the non-adhesive container of the second invention is a process in which hydrophobic oxide fine particles having an average primary particle diameter of 3 to 100 nm are attached to at least part or all of the surface of the container body that contacts the contents. It can obtain suitably by the manufacturing method containing.
- the container body As the container body, a known container can be adopted as described above.
- the method for performing the attaching step is not particularly limited.
- known methods such as dipping, brush coating, roll coating, and electrostatic powder coating can be employed.
- the adhesion step can be carried out by a method of drying after forming a coating film on the container body using a dispersion in which hydrophobic oxide fine particles are dispersed in a solvent. .
- the solvent in this case is not limited, and in addition to water, for example, alcohol (ethanol), cyclohexane, toluene, acetone, IPA, propylene glycol, hexylene glycol, butyl diglycol, pentamethylene glycol, normal pentane, normal hexane, hexyl alcohol
- An organic solvent such as can be selected as appropriate.
- a very small amount of a dispersant, a colorant, an anti-settling agent, a viscosity modifier and the like can be used in combination.
- the dispersion amount of the hydrophobic oxide fine particles in the solvent is usually about 10 to 100 g / L.
- drying either natural drying or forced drying (heat drying) may be used, but industrially forced drying is preferable.
- the drying temperature is not particularly limited depending on the material of the container, but it is usually preferably 250 ° C. or lower, particularly 120 to 200 ° C. from the viewpoint of maintaining non-adhesiveness.
- the container main body can be heated during and / or after the attaching step.
- the adhesion force (fixing force) of the hydrophobic oxide fine particles to the container body can be further increased.
- the heating temperature in this case is not particularly limited, but is usually about 120 to 200 ° C.
- the process of forming the thermoplastic resin layer containing a filler particle may be included before the process of attaching hydrophobic oxide microparticles
- a thermoplastic resin composition containing filled particles is used in a portion where hydrophobic oxide fine particles are attached, and in-mold molding, coating, thermal spraying, spraying, transfer, fitting, bonding, etc.
- the method may include a step of forming a thermoplastic resin layer.
- hydrophobic oxide fine particles can be adhered to the formed portion.
- the non-adhesion container which can maintain favorable water repellency and non-adhesion more effectively can be provided.
- the thermoplastic resin and the filler particles can be the same as those described in the first invention. In short, the same thermoplastic resin and filled particles as described in the first invention can be used, and those within the preferred range described in the first invention can be preferably used.
- thermoplastic resin layer containing the filler particles is formed is not limited. For example, it may be only a portion to which the hydrophobic oxide fine particles are attached, may include a portion to which the hydrophobic oxide fine particles are not attached, or may be the entire surface of the container.
- the packaging material of the third invention is a packaging material comprising a laminate having at least a base material layer and a thermal adhesive layer, and the thermal adhesive layer is laminated as an outermost layer on one surface of the packaging material, Hydrophobic oxide fine particles having an average primary particle diameter of 3 to 100 nm are attached to the outermost surface where the thermal adhesive layer is not adjacent to other layers.
- FIG. 6 shows a schematic diagram of a cross-sectional structure of the packaging material of the third invention.
- the packaging material of FIG. 6 consists of a laminated body in which the thermal adhesive layer 2 is laminated on the base material layer 1.
- the thermal adhesive layer 2 is laminated on one outermost layer of the packaging material (laminate).
- hydrophobic oxide fine particles 3 having an average primary particle diameter of 3 to 100 nm adhere to the surface (outermost surface) on the side not adjacent to the other layer (base material layer in FIG. 6). is doing.
- the hydrophobic oxide fine particles 3 are adhered and fixed to the heat bonding layer 2.
- the hydrophobic oxide fine particles 3 may contain primary particles, but it is preferable that the hydrophobic oxide fine particles 3 contain a large amount of aggregates (secondary particles).
- the hydrophobic oxide fine particles form a porous layer having a three-dimensional network structure. That is, it is preferable that a porous layer having a three-dimensional network structure formed of hydrophobic oxide fine particles is laminated on the thermal bonding layer 2.
- FIG. 7 shows a schematic diagram of a cross-sectional structure of a package produced using the packaging material of the third invention as a lid for a container.
- the description of the hydrophobic oxide fine particles 3 is omitted.
- the container 4 is filled with the contents 5 and sealed in such a state that the opening and the thermal adhesive layer 2 of the packaging material are in contact with each other. That is, the packaging material of the third invention is used in a state where the hydrophobic oxide fine particles adhering to the heat bonding layer 2 can come into contact with the contents 5. Even in such a case, the thermal adhesive layer 2 is protected by the hydrophobic oxide fine particles and has excellent non-adhesiveness.
- the adhesion of the contents to the thermal adhesive layer is blocked and repelled by the hydrophobic oxide fine particles (or the porous layer made of hydrophobic oxide fine particles). For this reason, the content does not remain in the vicinity of the thermal adhesive layer, but is repelled by the hydrophobic oxide fine particles (or the porous layer made of the hydrophobic oxide fine particles) and returns to the container.
- a material of the container 4 it can select suitably from a metal, a synthetic resin, glass, paper, those composite materials, etc., The kind and component of a heat bonding layer can be adjusted suitably according to the material.
- the packaging material according to the third aspect of the present invention is in a state in which the contents can come into contact with the outermost surface (particularly the hydrophobic oxide fine particles (or the porous layer made of hydrophobic oxide fine particles)) on the thermal adhesive layer side. It can be suitably used for products in which the contents are packaged in a packaging material.
- the base material layer a known material or a laminated material can be adopted.
- a simple substance such as paper, synthetic paper, a resin film, a resin film with a vapor deposition layer, an aluminum foil, or a composite material / laminated material thereof can be suitably used.
- These layers may be laminated at arbitrary positions with each layer employed in known packaging materials.
- a printing layer a printing protective layer (so-called OP layer), a colored layer, an adhesive layer, an adhesion reinforcing layer, a primer coat layer, an anchor coat layer, an anti-slip agent layer, a lubricant layer, an anti-fogging agent layer and the like can be mentioned.
- the lamination method in the case of using a laminated material is not limited, and a known method such as a dry lamination method, an extrusion lamination method, a wet lamination method, or a heat lamination method can be employed.
- the thickness of the base material layer is not limited, but may be appropriately set within a range of usually 15 to 500 ⁇ m from the viewpoint of strength, flexibility, cost, etc. as a packaging material.
- a known material can be used for the thermal adhesive layer.
- a layer formed of an adhesive such as a lacquer type adhesive, an easy peel adhesive, or a hot melt adhesive can be employed.
- a lacquer type adhesive or a hot melt adhesive it is preferable to employ a lacquer type adhesive or a hot melt adhesive, and particularly a thermal adhesive layer (hot melt layer) formed by the hot melt adhesive can be suitably employed.
- the thickness of the thermal adhesive layer is not particularly limited, but it is usually preferably about 2 to 150 ⁇ m from the viewpoint of sealing performance, productivity, cost and the like.
- the hydrophobic oxide fine particles existing on the heat bonded region are embedded in the heat bonding layer, and the heat bonding layer becomes the outermost surface so that the heat bonding is performed. It can be carried out. Therefore, it is desirable to set the thickness within the above thickness range so that as many hydrophobic oxide fine particles as possible can be embedded in the thermal adhesive layer.
- the hydrophobic oxide fine particles adhering to the thermal adhesive layer usually have an average primary particle size of 3 to 100 nm, preferably 5 to 50 nm, more preferably 5 to 20 nm.
- the hydrophobic oxide fine particles are in an appropriate aggregated state, and can hold a gas such as air in the voids in the aggregate, resulting in excellent non-adhesiveness. Obtainable. That is, this agglomerated state is maintained even after adhering to the thermal adhesive layer, so that excellent non-adhesiveness can be exhibited.
- the average primary particle diameter can be measured with a scanning electron microscope (FE-SEM), and when the resolution of the scanning electron microscope is low, the transmission electron microscope or the like is used.
- An electron microscope may be used in combination.
- the particle shape is spherical
- the diameter is considered as the diameter
- the particle shape is non-spherical
- the average value of the longest diameter and the shortest diameter is regarded as the diameter, and 20 arbitrarily selected by observation with a scanning electron microscope or the like.
- the average diameter of the particles is defined as the average primary particle diameter.
- the specific surface area (BET method) of the hydrophobic oxide fine particles is not particularly limited, but is usually 50 to 300 m 2 / g, particularly preferably 100 to 300 m 2 / g.
- the hydrophobic oxide fine particles are not particularly limited as long as they have hydrophobicity, and may be those hydrophobized by surface treatment.
- fine particles in which hydrophilic oxide fine particles are subjected to a surface treatment with a silane coupling agent or the like to make the surface state hydrophobic can also be used.
- the type of oxide is not limited as long as it has hydrophobicity.
- at least one of silica (silicon dioxide), alumina, titania and the like can be used. These may be known or commercially available.
- silica product names “AEROSIL R972”, “AEROSIL R972V”, “AEROSIL R972CF”, “AEROSIL R974”, “AEROSIL RX200”, “AEROSIL RY200” (above, manufactured by Nippon Aerosil Co., Ltd.), “AEROSIL R202” “AEROSIL R805", “AEROSIL R812”, “AEROSIL R812S” (above, manufactured by Evonik Degussa).
- titania include “AEROXIDE TiO 2 T805” (manufactured by Evonik Degussa).
- alumina include fine particles in which the product name “AEROXIDE Alu C” (manufactured by Evonik Degussa) is treated with a silane coupling agent to make the particle surface hydrophobic.
- hydrophobic silica fine particles can be preferably used.
- hydrophobic silica fine particles having a trimethylsilyl group on the surface are preferable in that better non-adhesiveness can be obtained.
- commercially available products corresponding to this include “AEROSIL R812” and “AEROSIL R812S” (both manufactured by Evonik Degussa).
- the adhesion amount (weight after drying) of the hydrophobic oxide fine particles to be adhered to the heat bonding layer is not limited, but is usually preferably 0.01 to 10 g / m 2, and preferably 0.2 to 1.5 g / m 2. 2 is more preferable, and 0.3 to 1 g / m 2 is most preferable.
- the hydrophobic oxide fine particles attached to the heat bonding layer preferably form a porous layer having a three-dimensional network structure, and the thickness is preferably about 0.1 to 5 ⁇ m, and 0.2 to 2. More preferably, it is about 5 ⁇ m.
- the hydrophobic oxide fine particles may be attached to the entire surface of the thermal adhesive layer (the entire surface opposite to the base material layer side), or a region where the thermal adhesive layer is thermally bonded (so-called adhesive margin). It may be attached to the area excluding.
- adhesive margin a region where the thermal adhesive layer is thermally bonded
- the hydrophobic oxide fine particles present on the heat bonded region are buried in the heat bonding layer, so that the heat bonding is hindered. In view of industrial production, it is desirable to adhere to the entire surface of the thermal adhesive layer.
- the packaging material of the third invention is, for example, a method for manufacturing a packaging material comprising a laminate having at least a base material layer and a thermal adhesive layer, and has an average primary particle diameter on the surface of the thermal adhesive layer. It can be suitably obtained by a method for producing a packaging material including a step of attaching hydrophobic oxide fine particles of 3 to 100 nm (hereinafter also referred to as “attachment step”).
- the production of the laminate itself can be performed according to a known method.
- a thermal adhesive layer may be formed by the method described in (1).
- the method for carrying out the adhesion process is not particularly limited.
- known methods such as roll coating, gravure coating, bar coating, doctor blade coating, brush coating, and powder electrostatic coating can be employed.
- the adhesion step can be carried out by a method of forming a coating film on the thermal adhesive layer using a dispersion obtained by dispersing hydrophobic oxide fine particles in a solvent and then drying.
- the solvent in this case is not limited, and in addition to water, for example, alcohol (ethanol), cyclohexane, toluene, acetone, IPA, propylene glycol, hexylene glycol, butyl diglycol, pentamethylene glycol, normal pentane, normal hexane, hexyl alcohol
- An organic solvent such as can be selected as appropriate.
- a very small amount of a dispersant, a colorant, an anti-settling agent, a viscosity modifier and the like can be used in combination.
- the dispersion amount of the hydrophobic oxide fine particles in the solvent is usually about 10 to 100 g / L.
- drying either natural drying or forced drying (heat drying) may be used, but industrially forced drying is preferable.
- the drying temperature is not limited as long as it does not affect the thermal adhesive layer, but is usually 150 ° C. or less, and preferably 80 to 120 ° C.
- the laminate can be heated during and / or after the attaching step.
- the adhesion (fixing force) of the hydrophobic oxide fine particles to the thermal adhesive layer can be further increased.
- the heating temperature T in this case can be set as appropriate according to the type of the thermal adhesive layer and the like, and usually Tm ⁇ 50 ⁇ T ⁇ Tm + 50 with respect to the melting point Tm (melting start temperature) ° C. of the thermal adhesive layer used. It is preferable to be in the range.
- the packaging material of the third invention may be subjected to embossing, half-cutting, notching, etc., as necessary, as with known packaging materials.
- the packaging material of the fourth invention is a packaging material comprising a laminate having at least a base material layer and a thermal adhesive layer, and the thermal adhesive layer is laminated as an outermost layer on one surface of the packaging material, Hydrophobic oxide fine particles having an average primary particle diameter of 3 to 100 nm are attached to the outermost surface that contains an oxygen absorbent in at least one of the base material layer and the thermal adhesive layer, and the thermal adhesive layer is not adjacent to other layers. It is characterized by.
- FIG. 9 shows a schematic diagram of a cross-sectional structure of a packaging material according to one embodiment of the fourth invention.
- the packaging material of FIG. 9 consists of a laminated body in which the thermal adhesive layer 2 is laminated on the base material layer 1.
- the thermal adhesive layer 2 is laminated on one outermost layer of the packaging material (laminate).
- the oxygen absorbent 6 is contained in the thermal adhesive layer 2.
- some particles of the oxygen absorbent 6 may exist so as to straddle between the base material layer 1 and the heat bonding layer 2.
- hydrophobic oxide fine particles 3 having an average primary particle diameter of 3 to 100 nm are attached to the surface (outermost surface) which is not adjacent to the other layer (the base material layer in FIG. 9). is doing.
- the hydrophobic oxide fine particles 3 are adhered and fixed to the heat bonding layer 2. That is, even if the hydrophobic oxide fine particles and the content come into contact with each other, the hydrophobic oxide fine particles are adhered to such an extent that they do not fall off.
- the hydrophobic oxide fine particles 3 may contain primary particles, but it is desirable that a large amount of aggregates (secondary particles) are contained.
- the hydrophobic oxide fine particles form a porous layer having a three-dimensional network structure. That is, it is preferable that a porous layer having a three-dimensional network structure formed of hydrophobic oxide fine particles is laminated on the thermal bonding layer 2.
- FIG. 10 shows a schematic diagram of a cross-sectional structure of a package produced using the packaging material of the fourth invention as a lid for a container.
- the description of the hydrophobic oxide fine particles 3 and the oxygen absorbent 6 is omitted.
- the container 4 is filled with the contents 5 and sealed in such a state that the opening and the thermal adhesive layer 2 of the packaging material are in contact with each other. That is, the packaging material of the fourth invention is used in a state where the hydrophobic oxide fine particles adhering to the heat bonding layer 2 can come into contact with the contents 5. Even in such a case, the thermal adhesive layer 2 is protected by the hydrophobic oxide fine particles and has excellent non-adhesiveness.
- the adhesion of the contents to the thermal adhesive layer is blocked and repelled by the hydrophobic oxide fine particles (or the porous layer made of hydrophobic oxide fine particles). For this reason, the content does not remain in the vicinity of the thermal adhesive layer, but is repelled by the hydrophobic oxide fine particles (or the porous layer made of the hydrophobic oxide fine particles) and returns to the container.
- a material of the container 4 it can select suitably from a metal, a synthetic resin, glass, paper, those composite materials, etc., The kind of a heat bonding layer, a component, etc. can be adjusted suitably according to the material.
- the base material layer a known material or a laminated material can be adopted.
- a simple substance such as paper, synthetic paper, a resin film, a resin film with a vapor deposition layer, an aluminum foil, or a composite material / laminated material thereof can be suitably used.
- These layers may be laminated at arbitrary positions with each layer employed in known packaging materials.
- a printing layer a printing protective layer (so-called OP layer), a colored layer, an adhesive layer, an adhesion reinforcing layer, a primer coat layer, an anchor coat layer, an anti-slip agent layer, a lubricant layer, an anti-fogging agent layer and the like can be mentioned.
- the lamination method in the case of using a laminated material is not limited, and a known method such as a dry lamination method, an extrusion lamination method, a wet lamination method, or a heat lamination method can be employed.
- the thickness of the base material layer is not limited, but may be appropriately set within a range of usually 15 to 500 ⁇ m from the viewpoint of strength, flexibility, cost, etc. as a packaging material.
- a known material can be used for the thermal adhesive layer.
- a layer formed of an adhesive such as a lacquer type adhesive, an easy peel adhesive, or a hot melt adhesive can be employed.
- a lacquer type adhesive or a hot melt adhesive it is preferable to employ a lacquer type adhesive or a hot melt adhesive, and particularly a thermal adhesive layer (hot melt layer) formed by the hot melt adhesive can be suitably employed.
- the thickness of the thermal adhesive layer is not particularly limited, but it is usually preferably about 2 to 150 ⁇ m from the viewpoint of sealing performance, productivity, cost and the like.
- the hydrophobic oxide fine particles existing on the region to be thermally bonded are embedded in the heat bonding layer, and the heat bonding layer becomes the outermost surface, thereby heat bonding. It can be performed. Therefore, it is desirable to set the thickness within the above thickness range so that as many hydrophobic oxide fine particles as possible can be embedded in the thermal adhesive layer.
- the hydrophobic oxide fine particles adhering to the thermal adhesive layer usually have an average primary particle size of 3 to 100 nm, preferably 5 to 50 nm, more preferably 5 to 20 nm.
- the hydrophobic oxide fine particles are in an appropriate aggregated state, and can hold a gas such as air in the voids in the aggregate, resulting in excellent non-adhesiveness. Obtainable. That is, this agglomerated state is maintained even after adhering to the thermal adhesive layer, so that excellent non-adhesiveness can be exhibited.
- the average primary particle diameter can be measured with a scanning electron microscope (FE-SEM).
- FE-SEM scanning electron microscope
- the resolution of the scanning electron microscope is low, the transmission electron microscope or the like is used.
- An electron microscope may be used in combination.
- the particle shape is spherical, the diameter is considered as the diameter, and when the particle shape is non-spherical, the average value of the longest diameter and the shortest diameter is regarded as the diameter, and 20 arbitrarily selected by observation with a scanning electron microscope or the like.
- the average diameter of the particles is defined as the average primary particle diameter.
- the specific surface area (BET method) of the hydrophobic oxide fine particles is not particularly limited, but is usually 50 to 300 m 2 / g, particularly preferably 100 to 300 m 2 / g.
- the hydrophobic oxide fine particles are not particularly limited as long as they have hydrophobicity, and may be those hydrophobized by surface treatment.
- fine particles in which hydrophilic oxide fine particles are subjected to a surface treatment with a silane coupling agent or the like to make the surface state hydrophobic can also be used.
- the type of oxide is not limited as long as it has hydrophobicity.
- at least one of silica (silicon dioxide), alumina, titania and the like can be used. These may be known or commercially available.
- silica product names “AEROSIL R972”, “AEROSIL R972V”, “AEROSIL R972CF”, “AEROSIL R974”, “AEROSIL RX200”, “AEROSIL RY200” (above, manufactured by Nippon Aerosil Co., Ltd.), “AEROSIL R202” “AEROSIL R805", “AEROSIL R812”, “AEROSIL R812S” (above, manufactured by Evonik Degussa).
- titania include “AEROXIDE TiO 2 T805” (manufactured by Evonik Degussa).
- alumina include fine particles in which the product name “AEROXIDE Alu C” (manufactured by Evonik Degussa) is treated with a silane coupling agent to make the particle surface hydrophobic.
- hydrophobic silica fine particles can be preferably used.
- hydrophobic silica fine particles having a trimethylsilyl group on the surface are preferable in that better non-adhesiveness can be obtained.
- commercially available products corresponding to this include “AEROSIL R812” and “AEROSIL R812S” (both manufactured by Evonik Degussa).
- the adhesion amount (weight after drying) of the hydrophobic oxide fine particles to be adhered to the heat bonding layer is not limited, but is usually preferably 0.01 to 10 g / m 2, and preferably 0.2 to 1.5 g / m 2. 2 is more preferable, and 0.3 to 1 g / m 2 is most preferable.
- the hydrophobic oxide fine particles attached to the heat bonding layer preferably form a porous layer having a three-dimensional network structure, and the thickness is preferably about 0.1 to 5 ⁇ m, and 0.2 to 2. More preferably, it is about 5 ⁇ m.
- the hydrophobic oxide fine particles may be attached to the entire surface of the thermal adhesive layer (the entire surface opposite to the base material layer side), or a region where the thermal adhesive layer is thermally bonded (so-called adhesive margin). It may be attached to the area excluding.
- adhesive margin a region where the thermal adhesive layer is thermally bonded
- the hydrophobic oxide fine particles existing on the heat-bonded region are buried in the heat-bonding layer, so that the heat bonding is inhibited. In view of industrial production, it is desirable to adhere to the entire surface of the thermal adhesive layer.
- an oxygen absorbent is contained in at least one of the base material layer and the thermal adhesive layer.
- an inorganic oxygen absorbent mainly composed of at least one fine powder of iron, silicon, aluminum, etc .
- organic oxygen absorption mainly composed of at least one kind such as ascorbic acid and unsaturated fatty acid.
- Agents a main agent capable of irreversibly adsorbing oxygen is preferable.
- the main component of the inorganic oxygen absorbent it is also possible to use a metal particle in which at least a part of the surface is coated with a resin component or an oxide.
- a metal particle in which at least a part of the surface is coated with a resin component or an oxide.
- aluminum-based particles aluminum generally has a high reaction rate with oxygen, so that the speed can be adjusted by coating a part or all of the surface of the aluminum-based particles with a resin component.
- Commercially available aluminum-based particles (resin-coated Al-based particles) themselves coated with such a resin component can be used, and can also be prepared by known methods.
- a known method can also be adopted when coating with an oxide (inorganic oxide). More specifically, in addition to the so-called sol-gel method, for example, the method described in Japanese Patent No.
- the organosilicon compound is adjusted by adjusting the pH of a dispersion solution containing aluminum particles, an organosilicon compound and a hydrolysis catalyst). And the like, and a silica film is deposited on the surface of the aluminum particles to obtain oxide-coated aluminum particles).
- the content of the oxygen absorbent can be appropriately set according to the desired oxygen absorption performance or the like, but is usually 0.3 to 30% by weight as the content of the main agent in the base material layer or the thermal adhesive layer. In particular, it is more preferably 1 to 20% by weight. By setting within the above range, excellent oxygen absorption performance can be obtained while maintaining desired thermal adhesiveness and the like.
- the oxygen absorbent may be contained in at least one of the base material layer and the thermal adhesive layer, but is preferably contained in at least the thermal adhesive layer from the viewpoint of obtaining oxygen absorption performance more effectively.
- the method for incorporating the oxygen absorbent in these layers is not limited as long as the oxygen absorbent can be uniformly dispersed.
- the method of mixing an oxygen absorbent with the raw material for forming a base material layer or a heat bonding layer in advance is mentioned.
- the mixing can be performed with a known mixer, stirrer, or the like. In this case, either dry mixing or wet mixing may be used.
- an inorganic oxygen absorbent using aluminum-based particles (or resin-coated Al-based particles) as a main agent will be described together with preferred embodiments thereof.
- the aluminum-based particles are not particularly limited as long as a predetermined oxygen absorption performance is exhibited.
- various aluminum alloy particles can be used in addition to pure aluminum particles.
- the average particle diameter of the aluminum-based particles is preferably about 1 to 100 ⁇ m. If the average particle size is less than 1 ⁇ m, it is unsuitable in terms of handleability. On the other hand, when it exceeds 100 ⁇ m, the specific surface area becomes small, and it is better to avoid it in terms of oxygen absorption capacity. Further, the shape of the aluminum-based particles is not limited, and may be any of spherical shape, spheroid shape, indefinite shape, teardrop shape, flat shape, and the like.
- the resin component (polymer) coated on the surface of the aluminum-based particles is preferably a copolymer obtained by reacting at least two oligomers and monomers having at least one polymerizable double bond.
- the amount of each oligomer or monomer used can be arbitrarily set.
- the oligomer or monomer constituting the polymer is not particularly limited as long as it has at least one polymerizable double bond.
- Examples of the monomer having at least one polymerizable double bond include unsaturated carboxylic acids (for example, acrylic acid, methacrylic acid, crotonic acid, itaconic acid, citraconic acid, maleic acid or maleic anhydride), and nitriles thereof (for example, acrylonitrile).
- unsaturated carboxylic acids for example, acrylic acid, methacrylic acid, crotonic acid, itaconic acid, citraconic acid, maleic acid or maleic anhydride
- nitriles thereof for example, acrylonitrile
- methacrylonitrile or esters thereof (for example, methyl acrylate, ethyl acrylate, propyl acrylate, n-butyl acrylate, 2-ethylhexyl acrylate, lauryl acrylate, stearyl acrylate, hydroxyethyl acrylate, acrylic acid 2) -Hydroxypropyl, methoxyethyl acrylate, butoxyethyl acrylate, glycidyl acrylate, cyclohexyl acrylate, 1,6-hexanediol diacrylate, 1,4-butanediol diacrylate, trimethyl Propane triacrylate, tetramethylol methane tetraacrylate, tetramethylol methane triacrylate, methyl methacrylate, ethyl methacrylate, propyl methacrylate, n-butyl methacrylate, 2-ethylhexyl
- a cyclic unsaturated compound for example, cyclohexene
- an acyclic unsaturated compound for example, styrene, ⁇ -methylstyrene, vinyl toluene, divinylbenzene, cyclohexene vinyl monoxide, divinylbenzene monooxide, vinyl acetate, vinyl propionate, or Examples thereof include diallylbenzene).
- the stability is further improved by the crosslinking action (it can be coated with a more stable film).
- the use of monomers having at least two ionic double bonds is particularly preferred.
- Examples of the oligomer having at least one polymerizable double bond include epoxidized 1,2-polybutadiene, acrylic-modified polyester, acrylic-modified polyether, acrylic-modified urethane, acrylic-modified epoxy, and acrylic-modified spirane (all having a polymerization degree of 2 About 20).
- epoxidized 1,2-polybutadiene and acrylic modified polyester is preferable.
- the degree of polymerization is preferably about 3 to 10.
- the use of an oligomer makes the reaction efficiency very high because the polymerization reaction proceeds gradually, and is preferable to the case where the monomer is used alone.
- the method for coating aluminum particles is not particularly limited. For example, 1) a method of impregnating or immersing aluminum-based particles in a solution or dispersion obtained by dissolving or dispersing a resin component in a solvent, and then drying to coat the resin component on the particle surface; 2) After preparing a solution or dispersion containing a monomer or oligomer capable of constituting a predetermined resin component and a mixed solution containing aluminum-based particles, the monomer or oligomer is polymerized to form particles of the polymer (resin component). For example, a method of coating the surface.
- the above method 2) can be suitably employed.
- this method for example, after preparing a dispersion liquid in which aluminum-based particles are dispersed in an organic solvent, at least two kinds of oligomers and monomers having at least one polymerizable double bond are dissolved in the dispersion liquid. Then, the copolymer can be coated on the particle surface by heating in the presence of a polymerization initiator.
- organic solvent examples include aliphatic hydrocarbons such as hexane, heptane, octane, cyclohexane, and mineral spirits, aromatic hydrocarbons such as benzene, toluene, and xylene, chlorobenzene, trichlorobenzene, perchlorethylene, and trichlorobenzene.
- Halogenated hydrocarbons such as methanol, ethanol, n-propartur, n-butanol and the like, ketones such as 2-propanone and 2-butanone, esters such as ethyl acetate and propyl acetate, tetrahydrofuran, diethyl Examples include ether and ethylpropyl ether.
- polymerization initiator examples include known high-temperature or medium-temperature polymerization initiators such as di-t-butyl peroxide, acetyl peroxide, benzoyl peroxide, lauroyl peroxide, cumyl hydroperoxide, t-butyl hydroperoxide and the like.
- An azo compound such as ⁇ , ⁇ '-azobisisobutyronitrile can be used.
- the polymerization reaction temperature (heating temperature) is not limited, and can generally be appropriately set within a range of 60 to 200 ° C.
- the polymerization reaction can be carried out in an inert gas atmosphere such as nitrogen, helium, argon or the like for the purpose of increasing the polymerization efficiency, if necessary.
- an inert gas atmosphere such as nitrogen, helium, argon or the like for the purpose of increasing the polymerization efficiency, if necessary.
- the resin-coated Al-based particles produced as described above may be recovered using a known solid-liquid separation method, purification method, or the like as necessary.
- aluminum compound particles when aluminum-based particles are used as the main agent, it is preferable to use aluminum compound particles as the auxiliary agent.
- the aluminum compound include at least one of alumina (aluminum oxide), aluminum hydroxide, aluminate, aluminosilicate, and the like. Among these, it is particularly preferable to use alumina. By using alumina particles, effective oxygen absorption performance can be expressed by its catalytic action.
- the ratio between the aluminum-based particles and the auxiliary agent is not particularly limited, but is preferably 3: 7 to 7: 3 by mass ratio.
- an electrolyte may be added to effectively promote the oxygen absorption action of the aluminum-based particles.
- the electrolyte for example, at least one of calcium oxide, calcium hydroxide, magnesium oxide, magnesium hydroxide, sodium chloride, potassium chloride, calcium chloride, sodium carbonate, calcium carbonate and the like can be added in an appropriate amount as necessary.
- hydrogen generation inhibitors such as silver oxide, titanium, zeolite, activated carbon, and sulfide are required in the oxygen absorbent. Accordingly, it can be added in the range of 1 ppm to 10% by mass.
- the packaging material of the fourth invention is, for example, a method for manufacturing a packaging material comprising a laminate having at least a base material layer and a thermal adhesive layer, and has an average primary particle diameter on the surface of the thermal adhesive layer. It can be suitably obtained by a method for producing a packaging material including a step of attaching hydrophobic oxide fine particles of 3 to 100 nm (hereinafter also referred to as “attachment step”).
- the production of the laminate itself can be performed according to a known method.
- a thermal adhesive layer may be formed by the method described in (1).
- the oxygen absorbent is the same as in 1. Those described in the above can be used. As described above, these may be contained in advance in the raw material for forming the base material layer and / or the thermal adhesive layer.
- the method for carrying out the step of attaching the hydrophobic oxide fine particles is not particularly limited.
- known methods such as roll coating, gravure coating, bar coating, doctor blade coating, brush coating, and powder electrostatic coating can be employed.
- the adhesion step can be carried out by a method of drying after forming a coating film on the thermal adhesive layer using a dispersion in which hydrophobic oxide fine particles are dispersed in a solvent.
- the solvent in this case is not limited, but water, for example, alcohol (ethanol), cyclohexane, toluene, acetone, IPA, propylene glycol, hexylene glycol, butyl diglycol, pentamethylene glycol, normal pentane, normal hexane, hexyl alcohol
- An organic solvent such as can be selected as appropriate.
- a very small amount of a dispersant, a colorant, an anti-settling agent, a viscosity modifier and the like can be used in combination.
- the dispersion amount of the hydrophobic oxide fine particles in the solvent is usually about 10 to 100 g / L.
- drying either natural drying or forced drying (heat drying) may be used, but industrially forced drying is preferable.
- the drying temperature is not limited as long as it does not affect the thermal adhesive layer, but it is usually 150 ° C. or lower, preferably 80 to 120 ° C.
- the laminate can be heated during and / or after the attaching step.
- the adhesion (fixing force) of the hydrophobic oxide fine particles to the thermal adhesive layer can be further increased.
- the heating temperature T in this case can be set as appropriate according to the type of the thermal adhesive layer and the like, and usually Tm ⁇ 50 ⁇ T ⁇ Tm + 50 with respect to the melting point Tm (melting start temperature) ° C. of the thermal adhesive layer used. It is preferable to be in the range.
- the packaging material of the present invention may be subjected to embossing, half-cutting, notching, etc., as necessary, similarly to known packaging materials.
- Examples 1-1 to 1-9 and Comparative Example 1-1 A sample was prepared by attaching hydrophobic oxide fine particles to a laminate having a thermoplastic resin layer. Specifically, each sample was produced as follows.
- Example 1-1 Comparative Example 1-1
- front printing and OP coating overprint coating
- polyurethane-based dry laminate adhesive weight after drying: 3.5 g / m 2 ; abbreviated as D
- AL vapor deposition PET polyethylene terephthalate film
- a heat seal lacquer (main component: 160 parts by weight of polyester resin + 10 parts by weight of acrylic resin + solvent (mixed solvent of toluene + MEK)) 40 parts by weight of lacquer as a thermoplastic resin layer on the polyethylene terephthalate film of the bonding material And a weight of about 3 g / m 2 (drying condition is 150 ° C. ⁇ 10 seconds).
- a laminate having a configuration of “OP / printing / paper / D / AL vapor deposition PET / lacquer” was obtained.
- Examples 1-2 to 1-6 1-20 parts by weight (shown in the table) of acrylic resin beads (average particle size: 30 ⁇ m, manufactured by Sekisui Kasei Kogyo Co., Ltd.) was further added and mixed in the heat seal lacquer, and the weight after drying was 3 g / m 2 (drying conditions) Was 150 ° C. ⁇ 10 seconds), and a laminate was produced in the same manner as in Example 1-1.
- Example 1-1 acrylic resin beads (average particle diameter: 15 ⁇ m, manufactured by Sekisui Chemical Co., Ltd.) were further added and mixed in the heat seal lacquer, and after drying, the weight was 3 g / m 2 (drying conditions were A laminate was produced in the same manner as in Example 1-1 except that coating was performed so that the temperature was 150 ° C. ⁇ 10 seconds.
- Example 1-9 In Example 1-1 above, acrylic resin beads (average particle size: 8 ⁇ m, manufactured by Sekisui Chemical Co., Ltd.) were further added and mixed in the heat seal lacquer, and after drying, the weight was 3 g / m 2 (drying conditions were A laminate was produced in the same manner as in Example 1-1 except that coating was performed so that the temperature was 150 ° C. ⁇ 10 seconds.
- Test Example 1-1 (opening strength) The opening strength of the samples obtained in each example and comparative example was examined.
- a package was produced using a lid material cut out from each packaging material into a lid shape (rectangular length 62 mm ⁇ width 67 mm with a tab). Specifically, the lid material is heated on the flange of a flanged polystyrene container (formed with a flange width of 4 mm, a flange outer diameter of 60 mm ⁇ 65 mm ⁇ , a height of about 48 mm, and an internal volume of about 100 cm 3 ). Each package was produced by sealing.
- the heat seal condition was a ring (concave) seal with a width of 2 mm in 1 second at a temperature of 210 ° C.
- Test Example 1-3 Initial yogurt non-adhesiveness
- a thermoplastic resin layer side of each laminate is used as a test surface, and this surface is used as an upper surface and fixed to a horizontal flat plate with a clip.
- a commercially available yogurt product name “Delicious Caspian Sea” soft yogurt, Glico Dairy Co., Ltd., 1 drop: About 0.4 g
- the results are shown in Tables 1 and 2.
- Test Example 1-5 (vibration test) Each package was prepared in the same manner as in Test Example 1-4, and each of these packages was reciprocated up and down for 20 minutes and 30 Hz (30 times per minute using a BF-30U manufactured by IDEX Co., Ltd.). After vibrating under the conditions of (vibration), 2.2 mm amplitude (vertical direction) and acceleration of about 1 G, the lid material was opened with fingers, and the weight of yogurt adhering to each lid material was measured. Less than 0.5 g / cup was accepted and 0.5 g / cup or more was rejected. The results are shown in Tables 1 and 2.
- Test Example 1-6 (Abrasion resistance test) Using the surface of the thermoplastic resin layer side of each laminate as the test surface, using the Gakushin type abrasion resistance tester (JIS K 5701-1), the number of reciprocations is 100 times, the load is 200 g, and the mating material is chrome-plated surface. A wear resistance test was performed. The same yogurt non-adhesion test as in Test Example 3 was performed after the abrasion resistance test. The yogurt droplets were judged to pass, and the case where the yogurt droplets tumbled without falling even when tilted by 90 degrees was rejected. The results are shown in Tables 1 and 2.
- Test Example 1-7 (contact angle) The contact angle measuring device (solid-liquid interface analyzer “Drop Master 300” manufactured by Kyowa Interface Science Co., Ltd.) was used to measure the contact angle of pure water using the thermoplastic resin layer side of each laminate as a test surface. The results are shown in Tables 1 and 2.
- the conventional product does not exhibit non-adhesiveness (yogurt repellent property) at all, and the contact angle of pure water is 85 degrees. It can be seen that the invention 1 (Example) exhibits high non-adhesiveness. It can be seen that in terms of unsealing strength and sealing performance (sealing strength), good performance with no practical impediment is shown. Moreover, it can be seen from the results of the contact angle that the laminate and the packaging material of the first invention exhibit high water repellency.
- the outermost surface of the laminate of the first invention and the packaging material on the side of the thermoplastic resin layer (the surface on which the hydrophobic oxide fine particles are adhered) has a contact angle of pure water of 150 degrees or more. Excellent contents non-adhesiveness not seen.
- inorganic particles or organic particles are contained as filler particles in the thermoplastic resin layer, the wear resistance is remarkably improved, and the falling off of hydrophobic oxide fine particles can be effectively suppressed or prevented. It can be seen that continuous non-adhesiveness can be obtained.
- Example 2-1 A coating solution was prepared by dispersing 50 g of hydrophobic oxide fine particles (product name “AEROSIL R812S” manufactured by Evonik Degussa, BET specific surface area: 220 m 2 / g, primary particle average diameter: 7 nm) in 1000 mL of ethanol.
- a commercially available polypropylene container flange width of about 3 mm, flange outer diameter of about 70 mm, height of about 110 mm, and internal volume of about 200 cc
- a sample (container) was obtained by evaporating ethanol with a warm air of 25 ° C. ⁇ 30 seconds (drying treatment).
- Example 2-2 A coating solution was prepared by dispersing 50 g of hydrophobic oxide fine particles (product name “AEROSIL R812S” manufactured by Evonik Degussa, BET specific surface area: 220 m 2 / g, primary particle average diameter: 7 nm) in 1000 mL of ethanol.
- hydrophobic oxide fine particles product name “AEROSIL R812S” manufactured by Evonik Degussa, BET specific surface area: 220 m 2 / g, primary particle average diameter: 7 nm
- a commercially available flanged paper / polyethylene container with a flange width of 3 mm, a flange outer diameter of 70 mm, a height of about 55 mm, an internal volume of about 130 cm 3 and a thickness of about 300 ⁇ m coated with 100 ⁇ m of polyethylene Soaked inside the container).
- a sample (container) was obtained by evaporating ethanol with 25 ° C. warm air.
- Example 2-3 A coating solution was prepared by dispersing 50 g of hydrophobic oxide fine particles (product name “AEROSIL R812S” manufactured by Evonik Degussa, BET specific surface area: 220 m 2 / g, primary particle average diameter: 7 nm) in 1000 mL of ethanol.
- a commercially available polystyrene container (flange width: about 3 mm, flange outer diameter: about 88 mm, height: about 63 mm, internal volume: about 176 cc) was immersed in this coating solution.
- a sample (container) was obtained by evaporating ethanol with 25 ° C. warm air.
- Comparative Example 2-1 The commercially available polypropylene container used in Example 2-1 was directly used as a sample.
- Comparative Example 2-2 The commercially available paper / polyethylene container used in Example 2-2 was directly used as a sample.
- Comparative Example 2-3 The commercially available polystyrene container used in Example 2-3 was used as a sample as it was.
- Test Example 2-1 ⁇ Observation of porous layer made of hydrophobic oxide fine particles>
- the structure of the layer made of hydrophobic oxide fine particles was observed by FE-SEM.
- a porous layer having a three-dimensional network structure formed by hydrophobic oxide fine particles was observed.
- ⁇ Contact angle> The bottom inner surface of each container of Examples 2-1 to 2-3 was used as a test piece (test surface), and a contact angle measuring device (solid-liquid interface analyzing device “Drop” When the contact angle of pure water was measured using “Master 300” (manufactured by Kyowa Interface Science Co., Ltd.), all were 150 ° or more.
- the container of the second invention has a contact angle of pure water of 150 degrees or more, and has excellent content non-adhesiveness not found in conventional containers.
- Example 2-4 A sample (container) was obtained in the same manner as in Example 2-1, except that the drying treatment after the immersion treatment was hot air of 140 ° C. ⁇ 30 seconds.
- Example 2-5 A sample (container) was obtained in the same manner as in Example 2-1, except that the drying treatment after the immersion treatment was hot air of 160 ° C. ⁇ 30 seconds.
- Test Example 2-2 ⁇ Sustainability improvement test> The weight (A) of each container of Example 2-1, Example 2-4, and Example 2-5 was measured in advance, and then commercially available yogurt (product name “Delicious Caspian Sea” soft yogurt, Glico Dairy Co., Ltd.) was filled with 100 g each, and the coating liquid used in Example 1 was dried and applied to the surface of the heat-bonding layer of the laminate lid member made of 40 ⁇ m thick aluminum foil and the heat-bonding layer by 0.5 g / m 2 by weight. The lid material was thermally bonded to the opening end face (flange, etc.) of each container to obtain a package.
- commercially available yogurt product name “Delicious Caspian Sea” soft yogurt, Glico Dairy Co., Ltd.
- Each of these packages is subjected to a vibration tester (BF-30U manufactured by IDEX Co., Ltd.) for 1 minute, 30 Hz (30 vertical vibrations per minute), 2.2 mm amplitude (vertical direction), and acceleration of about 40 G.
- a vibration tester BF-30U manufactured by IDEX Co., Ltd.
- the lid material is unsealed (no yogurt adhered to the lid material), each container is turned upside down for 10 seconds (the opening is in the direction of the ground), and the contents are discharged.
- the amount of yogurt adhered was determined by determining BA.
- Example 3-1 to Example 3-9 and Comparative Example 3-1 to Comparative Example 3-3 Samples were prepared in which hydrophobic oxide fine particles were adhered to a laminate having each type of thermal bonding layer as shown in Table 5. Specifically, each sample was produced as follows.
- ⁇ Hot melt type> Using a polyurethane dry laminate adhesive (weight after drying: 3.5 g / m 2 ; abbreviated as D) on one side of a 15 ⁇ m thick aluminum foil (1N30, soft foil; abbreviated as AL), back printing (abbreviated as printing)
- the substrate was bonded to the printed surface of a 12 ⁇ m thick polyethylene terephthalate film (abbreviated as PET).
- the aluminum surface of this base material layer was subjected to an anchor coat (main component: polyester resin; abbreviated as AC) treatment, and a low density polyethylene resin (abbreviated as LDPE) was extruded and laminated to a film thickness of 20 ⁇ m after drying. .
- an anchor coat main component: polyester resin; abbreviated as AC
- LDPE low density polyethylene resin
- a gravure hot so that the hot melt agent (35 parts by weight of wax, 35 parts by weight of rosin and 30 parts by weight of ethylene-vinyl acetate copolymer; abbreviated as HM) is dried on low density polyethylene to a weight of 20 g / m 2. Melt coated. As a result, a laminate having a configuration of “PET / printing / D / AL / AC / LDPE / HM” was obtained.
- the hot melt agent 35 parts by weight of wax, 35 parts by weight of rosin and 30 parts by weight of ethylene-vinyl acetate copolymer; abbreviated as HM
- HM ethylene-vinyl acetate copolymer
- ⁇ Sealant type> Using a polyurethane dry laminate adhesive (weight after drying: 3.5 g / m 2 ; abbreviated as D) on one side of a 15 ⁇ m thick aluminum foil (1N30, soft foil; abbreviated as AL), back printing (abbreviated as printing)
- the substrate was bonded to the printed surface of a 12 ⁇ m thick polyethylene terephthalate film (abbreviated as PET).
- the aluminum surface of this base material layer is subjected to anchor coating (main component: polyester resin; abbreviated as AC), and then a sealant having a thickness of 30 ⁇ m using a low density polyethylene resin (film thickness after drying: 20 ⁇ m; abbreviated as LDPE).
- a film (main component: metallocene-catalyzed polyethylene; abbreviated as sealant) was extruded and laminated. As a result, a laminate having a configuration of “PET / printing / D / AL / AC / LDPE / sealant” was obtained.
- ⁇ Lacquer type> Using a polyurethane dry laminate adhesive (weight after drying: 3.5 g / m 2 ; abbreviated as D) on one side of a 15 ⁇ m thick aluminum foil (1N30, soft foil; abbreviated as AL), back printing (abbreviated as printing) The substrate was bonded to the printed surface of a 12 ⁇ m thick polyethylene terephthalate film (abbreviated as PET). A separately prepared polyethylene terephthalate film (abbreviated as PET) having a thickness of 12 ⁇ m was bonded to the aluminum surface of the base material layer using a polyurethane dry laminate adhesive (weight after drying: 3.5 g / m 2 ; abbreviated as D).
- PET polyethylene terephthalate film
- a heat seal lacquer (main component: acrylic resin + polyester resin: abbreviated as lacquer) was applied after drying to a weight of 5 g / m 2 .
- lacquer main component: acrylic resin + polyester resin: abbreviated as lacquer
- Test Example 3-1 (seal strength) The seal strength of the samples obtained in each example and comparative example was examined.
- Example 3-1 to Example 3-6 and Comparative Example 3-1 to Comparative Example 3-2 Packaging using a lid material cut out from each packaging material into a lid material shape (circular with a diameter of 75 mm with a tab) The body was made. Specifically, a flanged paper / polyethylene container (with a flange width of 3 mm, a flange outer diameter of 70 mm, a height of about 55 mm, an internal volume of about 130 cm 3 and a thickness of about 300 ⁇ m coated with 100 ⁇ m of polyethylene on the inside of the container. Each of the packaging bodies was produced by heat-sealing the lid material on the flanges of the molded product. The heat sealing conditions were a temperature of 160 ° C.
- Example 3-7 to Example 3-9 and Comparative Example 3-3 A package is produced using a lid material cut out from each packaging material into a lid shape (rectangular length 62 mm ⁇ width 67 mm). did. Specifically, the lid material is heated on the flange of a flanged polystyrene container (formed with a flange width of 4 mm, a flange outer diameter of 60 mm ⁇ 65 mm ⁇ , a height of about 48 mm, and an internal volume of about 100 cm 3 ). Each package was produced by sealing. The heat seal conditions were a ring (concave) seal with a width of 2 mm in 1 second at a temperature of 210 ° C. and a pressure of 2 kg / cm 2 .
- Test Example 3-3 (Contact angle) The contact angle measuring device (solid-liquid interface analyzer “Drop” The contact angle of pure water was measured using Master 300 (manufactured by Kyowa Interface Science Co., Ltd.). The results are shown in Table 5.
- Test Example 3-4 (Drop angle) Use the heat-adhesive layer side of each packaging material as the test surface and fix it on a horizontal flat plate with this surface as the top surface.
- a commercially available yogurt product name “Delicious Caspian Sea” soft yogurt, 1 drop manufactured by Glico Dairy Co., Ltd .: approx. 0.4 g
- the results are shown in Table 5.
- Comparative Example 3-1 to Comparative Example 3-3 the liquid flowed down without falling down even at 90 degrees.
- Test Example 3-5 Transport test 100 g (flange paper / polyethylene container) and 85 g (flange polystyrene product) of commercially available yogurt (product name “Delicious Caspian Sea” soft yogurt, manufactured by Glico Dairies Co., Ltd.) in the package used in Test Example 3-1. Each container was filled, and the lid was heat sealed in the same manner as in Test Example 3-1. After the package filled with yogurt was transported by a long distance truck at a distance of 1500 km, the lid was opened with fingers, and the state of the surface of each lid on the side of the thermal adhesive layer was visually observed. The results are shown in Table 5.
- the evaluation is “ ⁇ ” when there is no yogurt adhering, and “ ⁇ ” when there is some ring-like adhering in the periphery (adhesive area ratio 20% or less), and the adhering is slightly noticeable (adhesive area) The ratio was more than 20% and less than 90%), and the case where adhesion was found on almost the entire surface (adhesion area ratio of 90% or more) was marked with “X”. In this case, “ ⁇ ” and “ ⁇ ” are evaluated as good.
- the non-adhesive property is not exhibited at all in the conventional product (comparative example), whereas the high non-adhesive property is exhibited in the third invention (example). Recognize.
- the present invention shows good performance that is practically satisfactory in terms of seal strength and sealability (puncture value).
- the packaging material of this invention shows high non-adhesiveness also from the result of a contact angle and a fall angle.
- the outermost surface of the packaging material of the third invention on the thermal adhesive layer side has a contact angle of pure water of 150 degrees or more, which is superior to conventional packaging materials. Non-adhesive content.
- the main component of the aluminum oxygen absorbent is pure aluminum powder (atomized powder manufactured by Toyo Aluminum Co., Ltd., average particle size: 8 ⁇ m, BET specific surface area 0.7 m 2. / G) and resin-coated aluminum powder (resin coating amount 3 g / 100 g aluminum content) whose resin was coated on the surface of the aluminum powder.
- the method for coating the surface of the aluminum powder with a resin is as follows.
- a fourth flask having a volume of 3 liters was epoxidized 1,2-polybutadiene: 1.5 g, trimethylolpropane triacrylate: 3.5 g, acrylic acid: 0.3 g, Divinylbenzene: 1.4 g, mineral spirit: 1440 g, untreated aluminum powder: 200 g were charged and sufficiently stirred and mixed while introducing nitrogen gas.
- the temperature inside the system was raised to 80 ° C., 1.1 g of ⁇ , ⁇ ′-azobisisobutyronitrile (AIBN) was added, and the mixture was reacted at 80 ° C. for 6 hours while stirring was continued. After completion of the reaction, the mixed solution was filtered and dried at 140 ° C.
- AIBN 1.1 g of ⁇ , ⁇ ′-azobisisobutyronitrile
- Example 4-2 and Example 4-3 thermal adhesive was obtained.
- each of the thermal adhesives prepared in (1-1) and (1-2) was applied to a weight of 3 g / m 2 after drying.
- a thermal adhesive containing no oxygen absorbent main component: 160 parts by weight of a polyester resin + 10 parts by weight of an acrylic resin + 40 parts by weight of a solvent (a mixed solvent of toluene + MEK)
- main component 160 parts by weight of a polyester resin + 10 parts by weight of an acrylic resin + 40 parts by weight of a solvent (a mixed solvent of toluene + MEK)
- a packaging material was prepared in the same manner as described above except that.
- hydrophobic oxide fine particles 5 g of hydrophobic oxide fine particles (product name “AEROSIL R812S” manufactured by Evonik Degussa, BET specific surface area: 220 m 2 / g, primary particle average diameter: 7 nm) are dispersed in 100 mL of ethanol.
- a coating solution was prepared. This coating solution is applied to the surface of the thermal adhesive layer of the packaging material prepared in (2) above by a bar coating method so that the weight after drying is 0.5 g / m 2, and then at 100 ° C. for about 10 seconds. The sample was obtained by drying and evaporating the ethanol. In addition, the hydrophobic oxide fine particles are not attached to the sample of Comparative Example 4-1.
- Non-adhesive and scattering properties of yogurt A package is prepared in the same manner as in (5) above except that the content is a commercially available yogurt (product name “Delicious Caspian Sea” soft yogurt, manufactured by Glico Dairy Co., Ltd.) And after leaving in a refrigerator set at 5 ° C. for 72 hours, tilt the container upside down (the container lid side is the ground direction) and then return to the original state (the container lid side is the top direction) This was repeated three times and the lid was opened. For the evaluation of non-adhesiveness, the state of the lid was visually observed, and the case where yogurt was adhered was defined as “failed” and the state where yogurt was not adhered was defined as “accepted”. In addition, as evaluation of the scattering property, when the lid was opened, the yogurt liquid droplets that had jumped out of the container were determined to be “failed”, and those that did not fly were determined to be “passed”. The results are shown in Table 6.
- the contact angle measurement device solid-liquid interface analyzer “Drop Master 300” manufactured by Kyowa Interface Science Co., Ltd. was used to measure the contact angle of pure water using the thermal adhesive layer side of each packaging material as the test surface. . The results are shown in Table 6.
- the outermost surface on the thermal adhesive layer side of the packaging material of the fourth invention (the surface on which hydrophobic oxide fine particles are adhered) has a contact angle of pure water of 150 degrees or more, which is superior to conventional packaging materials.
- Non-adhesive content since the lid material of the present invention contains an oxygen absorbent in at least one of the base material layer and the thermal adhesive layer, in addition to being effective for long-term storage by preventing spoilage and deterioration, the pressure in the package is reduced. It can be seen that the reduction is effective in preventing the contents from being scattered and ejected.
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Abstract
Description
本発明は、積層体及び包装材料に関する。特に、テーブルクロス、ナプキン、エプロン、テーブルカバー、床マット、壁面クロス、壁紙、ラベル、剥離紙、タグ、椅子カバー、防水シート、傘、スキーウェア、建築材、ベッドカバー、靴表面材、靴カバー、防水着、撥水フィルム、撥水シート等に用いる積層体ならびに食品、飲料品、医薬品、化粧品、化学品等を包装するために用いる包装材料に関する。
さらに、本発明は、非付着性容器及びその製造方法に関する。特に、内容物の非付着性に優れた容器とその製造方法に関する。より具体的には、食品、飲料品、医薬品、化粧品、化学品等を収容するための非付着性容器とその製造方法に関する。
さらに、本発明は、包装材料及びその製造方法に関する。より具体的には、食品、飲料品、医薬品、化粧品、化学品等を包装するために用いる包装材料とその製造方法に関する。特に、内容物の非付着性に優れた包装材料に関する。
さらに、本発明は、包装材料に関する。より具体的には、食品、飲料品、医薬品、化粧品、化学品等を包装するために用いる包装材料に関する。特に、内容物の非付着性と酸素吸収性に優れた包装材料に関する。
1. 最外面の少なくとも一部に一次粒子平均径3~100nmの疎水性酸化物微粒子が付着している非付着性積層体。
2. 熱可塑性樹脂を含有する層の表面の少なくとも一部に一次粒子平均径3~100nmの疎水性酸化物微粒子が付着している積層体。
3. 有機成分及び無機成分の少なくとも1種を含む充填粒子が前記熱可塑性樹脂を含有する層に含まれている、前記項2記載の積層体。
4. 疎水性酸化物微粒子の付着量が0.01~10g/m2である、前記項2に記載の積層体。
5. 疎水性酸化物微粒子が三次元網目状構造からなる多孔質層を形成している、前記項2に記載の積層体。
6. 疎水性酸化物微粒子のBET法による比表面積が50~300m2/gである、前記項2に記載の積層体。
7. 疎水性酸化物微粒子が疎水性シリカである、前記項2に記載の積層体。
8. 疎水性シリカがその表面にトリメチルシリル基を有する、前記項7に記載の積層体。
9. 前記充填粒子の平均粒子径が0.5~100μmである、前記項3に記載の積層体。
10. 前記項1~9のいずれかに記載の積層体を含む包装材料。
11. 内容物を収容するための容器であって、容器が少なくとも内容物と接触する面の一部又は全部に一次粒子平均径3~100nmの疎水性酸化物微粒子が付着している非付着性容器。
12. 疎水性酸化物微粒子の付着量が0.01~10g/m2である、前記項11に記載の非付着性容器。
13. 疎水性酸化物微粒子が三次元網目状構造からなる多孔質層を形成している、前記項11に記載の非付着性容器。
14. 疎水性酸化物微粒子のBET法による比表面積が50~300m2/gである、前記項11に記載の非付着性容器。
15. 疎水性酸化物微粒子が疎水性シリカである、前記項11に記載の非付着性容器。
16. 疎水性シリカがその表面にトリメチルシリル基を有する、前記項15に記載の非付着性容器。
17. 前記項11に記載の非付着性容器に内容物が充填されており、蓋材により当該内容物が密封されてなる製品。
18. 内容物を収容するための容器を製造する方法であって、容器が少なくとも内容物と接触する面の一部又は全部に一次粒子平均径3~100nmの疎水性酸化物微粒子を付着させる工程を含む非付着性容器の製造方法。
19. 内容物を収容するための容器を製造する方法であって、容器が少なくとも内容物と接触する面の一部又は全部に一次粒子平均径3~100nmの疎水性酸化物微粒子を付着させ、熱処理する工程を含む非付着性容器の製造方法。
20. 少なくとも基材層及び熱接着層を有する積層体からなる包装材料であって、前記熱接着層が包装材料の一方の面の最外層として積層されており、前記熱接着層が他の層と隣接していない最外面に一次粒子平均径3~100nmの疎水性酸化物微粒子が付着している包装材料。
21. 疎水性酸化物微粒子の付着量が0.01~10g/m2である、前記項20に記載の包装材料。
22. 疎水性酸化物微粒子が三次元網目状構造からなる多孔質層を形成している、前記項20に記載の包装材料。
23. 疎水性酸化物微粒子のBET法による比表面積が50~300m2/gである、前記項20に記載の包装材料。
24. 疎水性酸化物微粒子が疎水性シリカである、前記項20に記載の包装材料。
25. 疎水性シリカがその表面にトリメチルシリル基を有する、前記項24に記載の包装材料。
26. 熱接着層側の最外面に内容物が接触可能な状態で当該内容物が包装材料に包装されてなる製品のために用いられる、前記項20に記載の包装材料。
27. 少なくとも基材層及び熱接着層を有する積層体からなる包装材料を製造する方法であって、当該熱接着層の表面に一次粒子平均径3~100nmの疎水性酸化物微粒子を付着させる工程を含む包装材料の製造方法。
28. 前記工程中及び/又は前記工程後に積層体を加熱する工程をさらに含む、前記項27に記載の製造方法。
29. 少なくとも基材層及び熱接着層を有する積層体からなる包装材料であって、前記熱接着層が包装材料の一方の面の最外層として積層されており、前記熱接着層が他の層と隣接していない最外面に一次粒子平均径3~100nmの疎水性酸化物微粒子が付着し、疎水性酸化物微粒子が三次元網目状構造からなる多孔質層を形成している蓋材。
30. 少なくとも基材層及び熱接着層を有する積層体からなる包装材料であって、前記熱接着層が包装材料の一方の面の最外層として積層されており、前記熱接着層が他の層と隣接していない最外面に一次粒子平均径3~100nmの疎水性酸化物微粒子が付着し、疎水性酸化物微粒子が三次元網目状構造からなる多孔質層を形成している、袋体、成形容器、包装シート又はチューブとして用いる包装材料。
31. 少なくとも基材層及び熱接着層を有する積層体からなる包装材料であって、前記熱接着層が包装材料の一方の面の最外層として積層されており、前記基材層及び熱接着層の少なくとも一方に酸素吸収剤を含み、前記熱接着層が他の層と隣接していない最外面に一次粒子平均径3~100nmの疎水性酸化物微粒子が付着している包装材料。
32. 疎水性酸化物微粒子の付着量が0.01~10g/m2である、前記項31に記載の包装材料。
33. 疎水性酸化物微粒子が三次元網目状構造からなる多孔質層を形成している、前記項31に記載の包装材料。
34. 疎水性酸化物微粒子のBET法による比表面積が50~300m2/gである、前記項31に記載の包装材料。
35. 疎水性酸化物微粒子が疎水性シリカである、前記項31に記載の包装材料。
36. 疎水性シリカがその表面にトリメチルシリル基を有する、前記項35に記載の包装材料。
37. 前記酸素吸収剤が、粒子表面の少なくとも一部に樹脂成分及び無機酸化物の少なくとも1種が被覆された金属粒子を含む、前記項31に記載の包装材料。
38. 熱接着層側の最外面に内容物が接触可能な状態で当該内容物が包装材料に包装されてなる製品のために用いられる、前記項31に記載の包装材料。
第1発明の積層体及び包装材料は、良好な撥水性及び非付着性(又は防汚性)を発揮することができる。特に、熱可塑性樹脂を含む層(以下「熱可塑性樹脂層」ともいう。)に有機成分及び無機成分の少なくとも1種を含む充填粒子が含有されている場合は、疎水性酸化物微粒子の脱落を効果的に抑制ないしは防止することができる結果、良好な撥水性及び非付着性をより効果的に持続させることが可能となる。
第2発明の非付着性容器は、フッ素のような懸念物質を含むことなく、優れた非付着性を発揮することができる。これにより、内容物を容器からほぼすべて取り出すことができるので、容器内壁に付着する分のロスを抑制ないしは防止することができる。
第3発明の包装材料は、良好な熱接着性を維持しながらも、優れた非付着性を発揮することができる。すなわち、熱接着層の種類、厚み等の制限を受けることなく、熱接着性を実用上阻害せずに、高い非付着性を得ることができる。より具体的には、熱接着時において、熱接着される領域上に存在する疎水性酸化物微粒子は当該熱接着層中に埋め込まれるので熱接着を阻害しない一方、熱接着される領域外に存在する疎水性酸化物微粒子はそのまま熱接着層上に保持されているのでその高い非付着性を発揮することができる。
第4発明の包装材料は、良好な熱接着性を維持しながらも、優れた非付着性及び酸素吸収性を発揮することができる。すなわち、熱接着層の種類、厚み等の制限を受けることなく、熱接着性を実用上阻害せずに、高い非付着性を得ることができる。より具体的には、熱接着時において、熱接着される領域上に存在する疎水性酸化物微粒子は当該熱接着層中に埋め込まれるので熱接着を阻害しない一方、熱接着される領域外に存在する疎水性酸化物微粒子はそのまま熱接着層上に保持されているのでその高い非付着性を発揮することができる。
1.積層体・包装材料
第1発明の積層体は、熱可塑性樹脂を含有する層(以下「熱可塑性樹脂層」ともいう。)の表面の少なくとも一部に一次粒子平均径3~100nmの疎水性酸化物微粒子が付着していることを特徴とする。
熱可塑性樹脂は、公知の熱可塑性樹脂を採用することができる。例えば、アクリル樹脂、ポリスチレン、ABS樹脂、塩化ビニル樹脂、ポリエチレン樹脂、ポリプロピレン樹脂、ポリアミド系樹脂、ポリカーボネート、ポリアセタール、フッ素系樹脂、シリコン樹脂、ポリエステル系樹脂等のほか、これらのブレンド樹脂、これらを構成するモノマーの組合せを含む共重合体、変性樹脂等を用いることができる。
第1発明では、必要に応じて熱可塑性樹脂層に充填粒子を含有させることもできる。熱可塑性樹脂層中に充填粒子を分散させることにより、より優れた耐摩耗性等を熱可塑性樹脂層に付与することができる。
熱可塑性樹脂層に付着する疎水性酸化物微粒子は、一次粒子平均径が通常3~100nmであり、好ましくは5~50nmであり、より好ましくは5~20nmである。一次粒子平均径を上記範囲とすることにより、疎水性酸化物微粒子が適度な凝集状態となり、その凝集体中にある空隙に空気等の気体を保持することができる結果、優れた非付着性を得ることができる。すなわち、この凝集状態は、熱可塑性樹脂層に付着した後も維持されるので、優れた非付着性を発揮することができる。本発明において、疎水性酸化物微粒子は、熱可塑性樹脂(層)の片面あるいは両面に付着させることができる。
第1発明の積層体は、そのままで又は加工を施した上で包装材料をはじめ、他の様々な用途に用いることができる。他の用途としては、非付着性、防汚性、撥水性等が要求される分野であれば限定的でなく、例えばテーブルクロス、ナプキン、エプロン、テーブルカバー、床マット、壁面クロス、壁紙、ラベル、剥離紙、タグ、椅子カバー、防水シート、傘、スキーウェア、建築材、ベッドカバー、靴表面材、靴カバー、防水着、撥水フィルム、撥水シート等を挙げることができる。
第1発明の積層体(包装材料)は、例えば、少なくとも熱可塑性樹脂層を有する積層体ないし包装材料を製造する方法であって、当該熱可塑性樹脂層表面に一次粒子平均径3~100nmの疎水性酸化物微粒子を付着させる工程(以下「付着工程」ともいう。)を含む製造方法によって好適に得ることができる。
1.非付着性容器
第2発明の非付着性容器は、内容物を収容するための容器であって、容器が少なくとも内容物と接触する面の一部又は全部に一次粒子平均径3~100nmの疎水性酸化物微粒子が付着していることを特徴とする。
第2発明の非付着性容器は、容器本体の少なくとも内容物と接触する面の一部又は全部に一次粒子平均径3~100nmの疎水性酸化物微粒子を付着させる工程を含む製造方法によって好適に得ることができる。
1.包装材料
第3発明の包装材料は、少なくとも基材層及び熱接着層を有する積層体からなる包装材料であって、前記熱接着層が包装材料の一方の面の最外層として積層されており、前記熱接着層が他の層と隣接していない最外面に一次粒子平均径3~100nmの疎水性酸化物微粒子が付着していることを特徴とする。
第3発明の包装材料は、例えば、少なくとも基材層及び熱接着層を有する積層体からなる包装材料を製造する方法であって、当該熱接着層の表面に一次粒子平均径3~100nmの疎水性酸化物微粒子を付着させる工程(以下「付着工程」ともいう。)を含む包装材料の製造方法によって好適に得ることができる。
1.包装材料
第4発明の包装材料は、少なくとも基材層及び熱接着層を有する積層体からなる包装材料であって、前記熱接着層が包装材料の一方の面の最外層として積層されており、前記基材層及び熱接着層の少なくとも一方に酸素吸収剤を含み、前記熱接着層が他の層と隣接していない最外面に一次粒子平均径3~100nmの疎水性酸化物微粒子が付着していることを特徴とする。
第4発明の包装材料は、例えば、少なくとも基材層及び熱接着層を有する積層体からなる包装材料を製造する方法であって、当該熱接着層の表面に一次粒子平均径3~100nmの疎水性酸化物微粒子を付着させる工程(以下「付着工程」ともいう。)を含む包装材料の製造方法によって好適に得ることができる。
実施例1-1~1-9及び比較例1-1
熱可塑性樹脂層を有する積層体に対して疎水性酸化物微粒子を付着させたサンプルを作製した。具体的には下記のようにして各サンプルを作製した。
(実施例1-1、比較例1-1)
坪量55g/m2の紙の一方面に表印刷及びOPコート(オーバープリントコート)を施し、他方表面にポリウレタン系ドライラミネート接着剤(乾燥後重量3.5g/m2;Dと略称)を用いて、アルミニウムを蒸着した厚み16μmのポリエチレンテレフタレートフィルム(AL蒸着PETと略称)の蒸着面と貼り合わせた。さらにこの貼り合せ材のポリエチレンテレフタレートフィルム上に熱可塑性樹脂層としてヒートシールラッカー(主成分:ポリエステル系樹脂160重量部+アクリル系樹脂10重量部+溶剤(トルエン+MEKの混合溶剤)40重量部:ラッカーと略称)を乾燥後重量約3g/m2(乾燥条件は150℃×10秒)となるように塗布した。これによって、「OP/印刷/紙/D/AL蒸着PET/ラッカー」なる構成の積層体を得た。
(実施例1-2~1-6)
上記ヒートシールラッカー中にアクリル樹脂ビーズ(平均粒子径:30μm、積水化成工業株式会社製)をさらに1~20重量部(表中に示す)添加混合し、乾燥後重量3g/m2(乾燥条件は150℃×10秒)となるように塗布した以外は、実施例1-1と同様に積層体を作製した。
(実施例1-7~1-8)
上記実施例1-1において、ヒートシールラッカー中にアクリル樹脂ビーズ(平均粒子径:15μm、積水化成工業株式会社製)をさらに10重量部添加混合し、乾燥後重量3g/m2(乾燥条件は150℃×10秒)となるように塗布した以外は、実施例1-1と同様にして積層体を作製した。
(実施例1-9)
上記実施例1-1において、ヒートシールラッカー中にアクリル樹脂ビーズ(平均粒子径:8μm、積水化成工業株式会社製)をさらに10重量部添加混合し、乾燥後重量3g/m2(乾燥条件は150℃×10秒)となるように塗布した以外は、実施例1-1と同様にして積層体を作製した。
(実施例1-1~1-9)
疎水性酸化物微粒子(製品名「AEROSIL R812S」エボニック デグサ社製、BET比表面積:220m2/g、一次粒子平均径:7nm)5gをエタノール100mLに分散させてコート液を調製した。このコート液を前記(1)で作製された積層体の熱可塑性樹脂層の面に乾燥後重量で0.11~0.4g/m2(表中に示す)になるようにバーコート方式で付与した後、100℃で10秒程度をかけて乾燥させてエタノールを蒸発させることにより、サンプル(包装材料)を得た。
(比較例1-1)
実施例1-1の積層体において、疎水性酸化物微粒子を付着させていないものを試験用サンプルとした。
実施例の包装材料において、疎水性酸化物微粒子からなる層の構造をFE-SEMにより観察した。その結果、いずれの包装材料についても、疎水性酸化物微粒子により形成された三次元網目状構造を有する多孔質層が観察された。その一例として、実施例1-4の包装材料の一部断面観察写真を図3に示す。なお、同様の構造が形成されていることは他の実施例でも観察された。
各実施例及び比較例で得られたサンプルについて開封強度を調べた。
各包装材料から蓋材の形状(タブ付きの縦62mm×横67mmの矩形)に切り抜いた蓋材を用いて包装体を作製した。具体的には、フランジ付きポリスチレン製容器(フランジ幅4mm、フランジ外径60mm×65mm□、高さ約48mm、内容積約100cm3になるように成形したもの)のフランジ上に前記蓋材をヒートシールすることによって包装体をそれぞれ作製した。前記ヒートシール条件は、温度210℃及び圧力2kg/cm2にて1秒間で2mm幅のリング(凹状)シールとした。各包装体上の蓋材のタブを開封始点からみて仰角45度の方向に100mm/分の速度で引っ張り、開封時の最大荷重を開封強度(N)とし、各包装体についてn=6点測定し、その平均値を求めた。その結果を表1及び表2に示す。
試験例1-1で作製した包装体を試験サンプルとし、{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続け、空気漏れする時点の内圧(mmHg)を測定した。各包装体についてn=3点測定したが、いずれも測定上限値300mmHg以上であった。その結果を表1及び表2に示す。
各積層体の熱可塑性樹脂層側を試験面とし、この面を上面として水平な平台にクリップで固定し、市販のヨーグルト(製品名「おいしいカスピ海」ソフトヨーグルト、グリコ乳業株式会社製1滴:約0.4g)を至近距離から垂らし、水平な平台を傾け、ヨーグルト液滴が転げ落ちた場合は合格、平台を90度傾けても転げ落ちずに垂れ流れた場合を不合格とした。その結果を表1及び表2に示す。
試験例1-1で用いたフランジ付きポリスチレン製容器中に市販のヨーグルト(製品名「おいしいカスピ海」ソフトヨーグルト、グリコ乳業株式会社製)を85gそれぞれ充填し、試験例1-1と同様にして蓋材をヒートシールした。各包装体を10秒間天地逆(開口部が地の方向の状態)にして保持した後、各包装体の天地を戻した状態(=開口部が天方向の状態)で、手指で蓋材を開封し、各蓋材の熱可塑性樹脂層側の面の状態を目視で観察した。ヨーグルトが付着していない場合を合格、ヨーグルトが付着している状態を不合格とした。その結果を表1及び表2に示す。
試験例1-4と同様に各包装体を作製し、これらの各包装体を振動試験機(アイデックス株式会社製BF-30U)を用いて20分間、30Hz(1分間に30回の上下往復振動)、2.2mm振幅(上下方向)、加速度約1Gの条件にて振動させた後、蓋材を手指で開封し、各蓋材に付着したヨーグルトの重量を測定した。0.5g/cup未満を合格、0.5g/cup以上を不合格とした。その結果を表1及び表2に示す。
各積層体の熱可塑性樹脂層側の面を試験面とし、学振形耐磨耗試験機(JIS K 5701-1)で往復回数100回、荷重200g、相手材:クロムメッキ面の条件にて耐磨耗試験を実施した。耐磨耗試験後に試験例3と同じヨーグルト非付着性試験を行い、ヨーグルト液滴が転げ落ちた場合は合格、平台を90度傾けても転げ落ちずに垂れ流れた場合を不合格とした。その結果を表1及び表2に示す。
各積層体の熱可塑性樹脂層側を試験面とし、接触角測定装置(固液界面解析装置「Drop Master300」協和界面科学株式会社製)を用いて純水の接触角を測定した。その結果を表1及び表2に示す。
実施例2-1
疎水性酸化物微粒子(製品名「AEROSIL R812S」エボニック デグサ社製、BET比表面積:220m2/g、一次粒子平均径:7nm)50gをエタノール1000mLに分散させてコート液を調製した。このコート液中に市販のポリプロピレン製容器(フランジ幅約3mm、フランジ外径約70mm、高さ約110mm、内容積約200cc)を浸漬した。コート液の付着量は、乾燥後重量(=固形分付着量)で0.5g/m2であった。浸漬処理後、25℃×30秒の温風でエタノールを蒸発させること(乾燥処理)により、サンプル(容器)を得た。
疎水性酸化物微粒子(製品名「AEROSIL R812S」エボニック デグサ社製、BET比表面積:220m2/g、一次粒子平均径:7nm)50gをエタノール1000mLに分散させてコート液を調製した。このコート液中に市販のフランジ付き紙/ポリエチレン製容器(フランジ幅3mm、フランジ外径70mm、高さ約55mm、内容積約130cm3、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側になるように成形したもの)を浸漬した。コート液の付着量は、乾燥後重量(=固形分付着量)で0.5g/m2であった。浸漬処理後、25℃温風でエタノールを蒸発させることにより、サンプル(容器)を得た。
疎水性酸化物微粒子(製品名「AEROSIL R812S」エボニック デグサ社製、BET比表面積:220m2/g、一次粒子平均径:7nm)50gをエタノール1000mLに分散させてコート液を調製した。このコート液中に市販のフランジ付きポリスチレン製容器(フランジ幅約3mm、フランジ外径約88mm、高さ約63mm、内容積約176cc)を浸漬した。コート液の付着量は、乾燥後重量(=固形分付着量)で0.5g/m2であった。浸漬処理後、25℃温風でエタノールを蒸発させることにより、サンプル(容器)を得た。
実施例2-1で使用した市販のポリプロピレン製容器をそのままサンプルとして用いた。
実施例2-2で使用した市販の紙/ポリエチレン製容器をそのままサンプルとして用いた。
実施例2-3で使用した市販のポリスチレン製容器をそのままサンプルとして用いた。
<疎水性酸化物微粒子からなる多孔質層の観察>
実施例2-1~2-3の容器において、疎水性酸化物微粒子からなる層の構造をFE-SEMにより観察した。その結果、疎水性酸化物微粒子により形成された三次元網目状構造を有する多孔質層が観察された。
実施例2-1~実施例2-3の各容器の底内面を試験片(試験面)とし、接触角測定装置(固液界面解析装置「Drop
Master300」協和界面科学株式会社製)を用いて純水の接触角を測定したところ、いずれも150度以上であった。
実施例2-1~実施例2-3及び比較例2-1~比較例2-3の各容器の重量(A)を予め測定しておき、次に市販のヨーグルト(製品名「おいしいカスピ海」ソフトヨーグルト、グリコ乳業株式会社製)を100gそれぞれ充填後、当該容器を10秒間天地逆(開口部が地の方向の状態)にして内容物を排出させ、容器の天地を戻した状態(=開口部が天方向の状態)でその容器の重量(B)を測定した。B-Aを求めることにより、ヨーグルトの付着量とした。n=10の測定結果を表3に示す。
浸漬処理後の乾燥処理を140℃×30秒の熱風とした以外は、実施例2-1と同様にサンプル(容器)を得た。
浸漬処理後の乾燥処理を160℃×30秒の熱風とした以外は、実施例2-1と同様にサンプル(容器)を得た。
<持続性改善テスト>
実施例2-1、実施例2-4及び実施例2-5の各容器の重量(A)を予め測定しておき、次に市販のヨーグルト(製品名「おいしいカスピ海」ソフトヨーグルト、グリコ乳業株式会社製)を100gそれぞれ充填後、厚み40μmのアルミニウム箔+熱接着層からなるラミネート蓋材の熱接着層面に実施例1で用いたコート液を乾燥後重量で0.5g/m2塗布し、この蓋材を前記各容器の開口部端面(フランジ等)に熱接着し包装体とした。この各包装体を振動試験機(アイデックス株式会社製BF-30U)を用いて1分間、30Hz(1分間に30回の上下往復振動)、2.2mm振幅(上下方向)、加速度約40Gの条件にて振動させた後、蓋材を開封取り除き(蓋材にヨーグルトは付着しなかった)、各容器を10秒間天地逆(開口部が地の方向の状態)にして内容物を排出させ、容器の天地を戻した状態(=開口部が天方向の状態)でその容器の重量(B)を測定した。B-Aを求めることにより、ヨーグルトの付着量とした。n=10の測定結果を表4に示す。
<第3発明の実施例>
表5に示すような各タイプの熱接着層を有する積層体に対して疎水性酸化物微粒子を付着させたサンプルを作製した。具体的には下記のようにして各サンプルを作製した。
厚み15μmのアルミニウム箔(1N30、軟質箔;ALと略称)の片面にポリウレタン系ドライラミネート接着剤(乾燥後重量3.5g/m2;Dと略称)を用いて、裏印刷(印刷と略称)を施した厚み12μmのポリエチレンテレフタレートフィルム(PETと略称)の印刷面と貼り合わせ、基材層を作製した。この基材層のアルミニウム面にアンカーコート(主成分:ポリエステル系樹脂;ACと略称)処理を施した上、低密度ポリエチレン樹脂(LDPEと略称)を乾燥後膜厚20μmとなるように押出し積層した。さらに、低密度ポリエチレン上にホットメルト剤(ワックス35重量部、ロジン35重量部及びエチレン-酢酸ビニル共重合体30重量部;HMと略称)を乾燥後重量20g/m2となるようにグラビアホットメルトコートした。これによって、「PET/印刷/D/AL/AC/LDPE/HM」なる構成の積層体を得た。
厚み15μmのアルミニウム箔(1N30、軟質箔;ALと略称)の片面にポリウレタン系ドライラミネート接着剤(乾燥後重量3.5g/m2;Dと略称)を用いて、裏印刷(印刷と略称)を施した厚み12μmのポリエチレンテレフタレートフィルム(PETと略称)の印刷面と貼り合わせ、基材層を作製した。この基材層のアルミニウム面にアンカーコート(主成分:ポリエステル系樹脂;ACと略称)処理を施した上、低密度ポリエチレン樹脂(乾燥後膜厚20μm;LDPEと略称)を用いて厚み30μmのシーラントフィルム(主成分:メタロセン触媒ポリエチレン;シーラントと略称)を押出しラミネートした。これによって、「PET/印刷/D/AL/AC/LDPE/シーラント」なる構成の積層体を得た。
厚み15μmのアルミニウム箔(1N30、軟質箔;ALと略称)の片面にポリウレタン系ドライラミネート接着剤(乾燥後重量3.5g/m2;Dと略称)を用いて、裏印刷(印刷と略称)を施した厚み12μmのポリエチレンテレフタレートフィルム(PETと略称)の印刷面と貼り合わせ、基材層を作製した。この基材層のアルミニウム面にポリウレタン系ドライラミネート接着剤(乾燥後重量3.5g/m2;Dと略称)を用いて、別途用意した厚み12μmのポリエチレンテレフタレートフィルム(PETと略称)を貼り合わせた上、ヒートシールラッカー(主成分:アクリル樹脂+ポリエステル樹脂:ラッカーと略称)を乾燥後重量5g/m2となるように塗布した。これによって、「PET/印刷/D/AL/D/PET/ラッカー」なる構成の積層体を得た。
疎水性酸化物微粒子(製品名「AEROSIL R812S」エボニック デグサ社製、BET比表面積:220m2/g、一次粒子平均径:7nm)5gをエタノール100mLに分散させてコート液を調製した。このコート液を前記(1)で作製された積層体の熱接着層の面に乾燥後重量で0.3~1.0g/m2となるようにグラビアコート方式又はバーコート方式で付与した後、100℃で10秒程度をかけて乾燥させてエタノールを蒸発させることにより、サンプル(包装材料)を得た。
実施例の包装材料において、疎水性酸化物微粒子からなる層の構造をFE-SEMにより観察した。その結果、いずれの包装材料についても、疎水性酸化物微粒子により形成された三次元網目状構造を有する多孔質層が観察された。その一例として、実施例3-4(A)の観察結果を図8に示す。図8に示すように、熱接着層(シーラント)の上に黒色と白色が混ざった層が認められる。この白色の部分は疎水性酸化物からなる多孔質層である。こように、前記コート液を塗布及び乾燥することにより、疎水性酸化物微粒子からなる多孔質層が形成されることがわかる。
各実施例及び比較例で得られたサンプルについてシール強度を調べた。
各包装材料から蓋材の形状(タブ付きの直径75mmの円形)に切り抜いた蓋材を用いて包装体を作製した。具体的には、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70mm、高さ約55mm、内容積約130cm3、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側になるように成形したもの)のフランジ上に前記蓋材をヒートシールすることによって包装体をそれぞれ作製した。前記ヒートシール条件は、温度160℃及び圧力1kg/cm2で1秒間とした。各包装体上の蓋材のタブを開封始点からみて仰角45度の方向に100mm/分の速度で引っ張り、開封時の最大荷重をシール強度(N)とし、各包装体についてn=6点測定し、その平均値を求めた。その結果を表5に示す。
各包装材料から蓋材の形状(タブ付きの縦62mm×横67mmの矩形)に切り抜いた蓋材を用いて包装体を作製した。具体的には、フランジ付きポリスチレン製容器(フランジ幅4mm、フランジ外径60mm×65mm□、高さ約48mm、内容積約100cm3になるように成形したもの)のフランジ上に前記蓋材をヒートシールすることによって包装体をそれぞれ作製した。前記ヒートシール条件は、温度210℃及び圧力2kg/cm2にて1秒間で2mm幅のリング(凹状)シール)とした。各包装体上の蓋材のタブを開封始点からみて仰角45度の方向に100mm/分の速度で引っ張り、開封時の最大荷重をシール強度(N)とし、各包装体についてn=6点測定し、その平均値を求めた。その結果を表5に示す。
試験例3-1で作製した包装体を試験サンプルとし、{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続け、空気漏れする時点の内圧(mmHg)を測定した。各包装体についてn=3点測定し、その平均値を求めた。その結果を表5に示す。
各包装材料の熱接着層側を試験面とし、接触角測定装置(固液界面解析装置「Drop
Master300」協和界面科学株式会社製)を用いて純水の接触角を測定した。その結果を表5に示す。
各包装材料の熱接着層側を試験面とし、この面を上面として水平な平台にクリップで固定し、市販のヨーグルト(製品名「おいしいカスピ海」ソフトヨーグルト、グリコ乳業株式会社製1滴:約0.4g)を至近距離から垂らし、水平な平台を傾け、ヨーグルト液滴が転げ落ちたときの角度を求めた。その結果を表5に示す。なお、比較例3-1~比較例3-3は、90度でも転げ落ちずに垂れ流れた。
試験例3-1で用いた包装体中に市販のヨーグルト(製品名「おいしいカスピ海」ソフトヨーグルト、グリコ乳業株式会社製)を100g(フランジ付き紙/ポリエチレン製容器)及び85g(フランジ付きポリスチレン製容器)それぞれ充填し、試験例3-1と同様にして蓋材をヒートシールをした。ヨーグルトを充填した包装体を1500kmの距離を長距離トラックで輸送した後、手指で蓋材を開封し、各蓋材の熱接着層側の面の状態を目視で観察した。その結果を表5に示す。なお、評価は、ヨーグルトの付着なしの場合は「◎」とし、周辺部に若干リング状の付着がある場合(付着面積割合20%以下)は「○」とし、付着がやや目立つ場合(付着面積割合20%超え90%未満)は「△」とし、ほぼ全面に付着が認められる場合(付着面積割合90%以上)は「×」とした。この場合、「◎」「○」が良好と評価される。
<第4発明の実施例>
以下のようにサンプルを作製し、評価した。
(1-1)鉄系酸素吸収剤を含有した熱接着剤
鉄系酸素吸収剤は、市販品(三菱瓦斯化学株式会社製「エージレス」)をそのまま用い、ヒートシールラッカー(主成分:ポリエステル系樹脂160重量部+アクリル系樹脂10重量部+溶剤(トルエン+MEKの混合溶剤)40重量部)中に10重量%添加混合し、実施例4-1の熱接着剤とした。
(1-2)アルミニウム系酸素吸収剤を含有した熱接着剤
アルミニウム系酸素吸収剤の主剤は、純アルミニウム粉(東洋アルミニウム株式会社製アトマイズ粉、平均粒子径:8μm、BET比表面積0.7m2/g)と、そのアルミニウム粉の表面に樹脂を被覆した樹脂コートアルミニウム粉(樹脂コート量3g/100gアルミニウム分))を用いた。アルミニウム粉の表面に樹脂を被覆する方法は、容積3リットルの四ツ目フラスコにエポキシ化1,2-ポリブタジェン:1.5g、トリメチロールプロパントリアクリレート:3.5g、アクリル酸:0.3g、ジビニルベンゼン:1.4g、ミネラルスピリット:1440g、未処理アルミニウム粉:200gを装填し、窒素ガスを導入しながら十分攪拌混合した。系内の温度を80℃に昇温し、α、α′-アゾビスイソブチロニトリル(AIBN)を1.1g添加し、攪拌を続けながら80℃で6時間反応させた。反応終了後混合液を濾過し、140℃で乾燥させ、樹脂被覆アルミニウム粉を得た。
次に、アルミニウム系酸素吸収剤の主剤1g、α-アルミナ粉末(大明化学工業株式会社製TM-DAR、平均粒子径0.1μm、BET比表面積14.5m2/g)1g、酸化カルシウム(和光純薬株式会社製 純度99.9%)0.5g及びゼオライトA-4(和光純薬株式会社製,平均粒径3.5μm)0.5gを攪拌・混合し、続いてバインダー(主成分:ポリエステル系樹脂160重量部+アクリル系樹脂10重量部+溶剤(トルエン+MEKの混合溶剤)40重量部)27gを加えて攪拌混合し、さらに水を1g添加混合し、実施例4-2及び実施例4-3の熱接着剤とした。
厚み15μmのアルミニウム箔(1N30、軟質箔;ALと略称)の片面にポリウレタン系ドライラミネート接着剤(乾燥後重量3.5g/m2;Dと略称)を用いて、裏印刷(印刷と略称)を施した厚み12μmのポリエチレンテレフタレートフィルム(PETと略称)の印刷面と貼り合わせ、基材層を作製した。この基材層のアルミニウム面にポリウレタン系ドライラミネート接着剤(乾燥後重量3.5g/m2;Dと略称)を用いて、別途用意した厚み12μmのポリエチレンテレフタレートフィルム(PETと略称)を貼り合わせた上、前記(1-1)及び(1-2)で調製した各熱接着剤を乾燥後重量3g/m2となるようにそれぞれ塗布した。
なお、比較例4-1として、酸素吸収剤を含まない熱接着剤(主成分:ポリエステル系樹脂160重量部+アクリル系樹脂10重量部+溶剤(トルエン+MEKの混合溶剤)40重量部)を用いた以外は、前記と同様に包装材料を作製した。
疎水性酸化物微粒子(製品名「AEROSIL R812S」エボニック デグサ社製、BET比表面積:220m2/g、一次粒子平均径:7nm)5gをエタノール100mLに分散させてコート液を調製した。このコート液を前記(2)で作製された包装材料の熱接着層の面に乾燥後重量で0.5g/m2となるようにバーコート方式で付与した後、100℃で10秒程度をかけて乾燥させてエタノールを蒸発させることにより、サンプルを得た。なお、比較例4-1のサンプルには、疎水性酸化物微粒子を付着していない。
各実施例の包装材料において、疎水性酸化物微粒子からなる層の構造をFE-SEMにより観察した。その結果、いずれの包装材料についても、疎水性酸化物微粒子により形成された三次元網目状構造を有する多孔質層が観察された。
各サンプルから蓋材の形状(タブ付きの縦62mm×横67mmの矩形)に切り抜いて得られた蓋材を用いて包装体を作製した。具体的には、フランジ付きポリスチレン製容器(フランジ幅4mm、フランジ外径60mm×65mm□、高さ約48mm、内容積約105cm3になるように成形したもの)に水を80g充填し、容器のフランジ上に前記蓋材をヒートシールすることによって包装体をそれぞれ作製した。前記ヒートシール条件は、温度220℃及び圧力3kgf/cm2にて1秒間で約2mm幅のリング(凹状)シール)とした。常温で72時間静置後、装置「OXYGEN ANALYZER(TORAY製LC-750)」にて、容器内残存酸素濃度を測定した。その結果を表6に示す。
上記(5)と同様に作製した包装体を水槽中でサンプルの蓋を開封し、容器内から出てきた空気(気体)をメスシリンダーにて捕集し、気体の量を水中で測定した。その結果を表6に示す。
内容物を市販のヨーグルト(製品名「おいしいカスピ海」ソフトヨーグルト、グリコ乳業株式会社製)とした以外は、上記(5)と同様に包装体を作製し、5℃に設定した冷蔵庫内で72時間静置後、容器を傾け天地逆の状態(容器の蓋側が地の方向)にした後、元の状態(容器の蓋側が天の方向)に戻し、これを3回繰返し、蓋を開封した。非付着性の評価としては、蓋の状態を目視で観察し、ヨーグルトが付着した場合を「不合格」、ヨーグルトが付着していない状態を「合格」とした。また、飛散性の評価としては、蓋の開封時にヨーグルト液滴が容器外に飛出したものを「不合格」、飛出しなかったものを「合格」とした。その結果を表6に示す。
各包装材料の熱接着層側を試験面とし、接触角測定装置(固液界面解析装置「Drop Master300」協和界面科学株式会社製)を用いて純水の接触角を測定した。その結果を表6に示す。
Claims (26)
- 最外面の少なくとも一部に一次粒子平均径3~100nmの疎水性酸化物微粒子が付着している非付着性積層体。
- 熱可塑性樹脂を含有する層の表面の少なくとも一部に前記疎水性酸化物微粒子が付着している、請求項1に記載の積層体。
- 有機成分及び無機成分の少なくとも1種を含む充填粒子が前記熱可塑性樹脂を含有する層に含まれている、請求項2に記載の積層体。
- 疎水性酸化物微粒子が三次元網目状構造からなる多孔質層を形成している、請求項1に記載の積層体。
- 疎水性酸化物微粒子が疎水性シリカである、請求項1に記載の積層体。
- 疎水性シリカがその表面にトリメチルシリル基を有する、請求項5に記載の積層体。
- 前記充填粒子の平均粒子径が0.5~100μmである、請求項3に記載の積層体。
- 請求項1~7のいずれかに記載の積層体を含む包装材料。
- 請求項1~7のいずれかに記載の積層体を含む容器であって、容器が少なくとも内容物と接触する面の一部又は全部に前記疎水性酸化物微粒子が付着している非付着性容器。
- 請求項9に記載の非付着性容器に内容物が充填されており、蓋材により当該内容物が密封されてなる製品。
- 内容物を収容するための容器を製造する方法であって、容器が少なくとも内容物と接触する面の一部又は全部に一次粒子平均径3~100nmの疎水性酸化物微粒子を付着させる工程を含む非付着性容器の製造方法。
- 前記の疎水性酸化物微粒子を付着させる工程の後、熱処理する工程をさらに含む、請求項11に記載の製造方法。
- 少なくとも基材層及び熱接着層を有する積層体からなる包装材料であって、前記熱接着層が包装材料の一方の面の最外層として積層されており、前記熱接着層が他の層と隣接していない最外面に一次粒子平均径3~100nmの疎水性酸化物微粒子が付着している包装材料。
- 疎水性酸化物微粒子が三次元網目状構造からなる多孔質層を形成している、請求項13に記載の包装材料。
- 疎水性酸化物微粒子が疎水性シリカである、請求項13に記載の包装材料。
- 疎水性シリカがその表面にトリメチルシリル基を有する、請求項15に記載の包装材料。
- 熱接着層側の最外面に内容物が接触可能な状態で当該内容物が包装材料に包装されてなる製品のために用いられる、請求項13に記載の包装材料。
- 少なくとも基材層及び熱接着層を有する積層体からなる包装材料を製造する方法であって、当該熱接着層の表面に一次粒子平均径3~100nmの疎水性酸化物微粒子を付着させる工程を含む包装材料の製造方法。
- 前記工程中及び/又は前記工程後に積層体を加熱する工程をさらに含む、請求項18に記載の製造方法。
- 少なくとも基材層及び熱接着層を有する積層体からなる包装材料であって、前記熱接着層が包装材料の一方の面の最外層として積層されており、前記熱接着層が他の層と隣接していない最外面に一次粒子平均径3~100nmの疎水性酸化物微粒子が付着し、疎水性酸化物微粒子が三次元網目状構造からなる多孔質層を形成している蓋材。
- 少なくとも基材層及び熱接着層を有する積層体からなる包装材料であって、前記熱接着層が包装材料の一方の面の最外層として積層されており、前記熱接着層が他の層と隣接していない最外面に一次粒子平均径3~100nmの疎水性酸化物微粒子が付着し、疎水性酸化物微粒子が三次元網目状構造からなる多孔質層を形成している、袋体、成形容器、包装シート又はチューブとして用いる包装材料。
- 少なくとも基材層及び熱接着層を有する積層体からなる包装材料であって、前記熱接着層が包装材料の一方の面の最外層として積層されており、前記基材層及び熱接着層の少なくとも一方に酸素吸収剤を含み、前記熱接着層が他の層と隣接していない最外面に一次粒子平均径3~100nmの疎水性酸化物微粒子が付着している包装材料。
- 疎水性酸化物微粒子が三次元網目状構造からなる多孔質層を形成している、請求項22に記載の包装材料。
- 疎水性酸化物微粒子が疎水性シリカである、請求項22に記載の包装材料。
- 疎水性シリカがその表面にトリメチルシリル基を有する、請求項24に記載の包装材料。
- 前記酸素吸収剤が、粒子表面の少なくとも一部に樹脂成分及び無機酸化物の少なくとも1種が被覆された金属粒子を含む、請求項22に記載の包装材料。
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JP2012041049A (ja) * | 2010-08-12 | 2012-03-01 | Morinaga Milk Ind Co Ltd | カップ状容器の蓋体及びその製造方法 |
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JP2014055013A (ja) * | 2012-09-12 | 2014-03-27 | Toppan Printing Co Ltd | 蓋材 |
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JP2015010221A (ja) * | 2013-07-02 | 2015-01-19 | 東洋製罐グループホールディングス株式会社 | 滑水性に優れた表面を有する樹脂成形体 |
WO2015002012A1 (ja) * | 2013-07-02 | 2015-01-08 | 東洋製罐グループホールディングス株式会社 | 滑水性に優れた表面を有する樹脂成形体 |
US10266735B2 (en) | 2013-07-02 | 2019-04-23 | Toyo Seikan Group Holdings, Ltd. | Resin formed body having surface that exhibits excellent water-sliding property |
JP2015089832A (ja) * | 2013-11-07 | 2015-05-11 | 昭和電工パッケージング株式会社 | 内容物付着防止蓋材 |
RU2675145C1 (ru) * | 2015-03-27 | 2018-12-17 | Тойо Сейкан Груп Холдингз, Лтд. | Структурированное изделие, имеющее гидрофобную поверхность, и способ его изготовления |
JP2018059109A (ja) * | 2017-11-01 | 2018-04-12 | 東洋アルミニウム株式会社 | 包装材料 |
JP2018083948A (ja) * | 2017-12-06 | 2018-05-31 | 東洋製罐グループホールディングス株式会社 | 滑水性に優れた表面を有する樹脂成形体 |
Also Published As
Publication number | Publication date |
---|---|
DK2666627T3 (en) | 2015-09-14 |
US9327879B2 (en) | 2016-05-03 |
EP2397319B1 (en) | 2014-04-16 |
PL2857190T3 (pl) | 2017-07-31 |
ES2546169T3 (es) | 2015-09-21 |
US20150017334A1 (en) | 2015-01-15 |
PT2397319E (pt) | 2014-05-06 |
KR20110120889A (ko) | 2011-11-04 |
KR101330001B1 (ko) | 2013-11-15 |
EP2397319A1 (en) | 2011-12-21 |
AU2010214393A1 (en) | 2011-09-15 |
EP2666627B1 (en) | 2015-08-12 |
PL2666627T3 (pl) | 2015-12-31 |
EP2666627A1 (en) | 2013-11-27 |
TWI488746B (zh) | 2015-06-21 |
AU2010214393B2 (en) | 2015-09-24 |
US20120118886A1 (en) | 2012-05-17 |
CN102317067B (zh) | 2014-04-16 |
BRPI1013669A2 (pt) | 2016-04-26 |
EP2857190B1 (en) | 2017-01-25 |
CN102317067A (zh) | 2012-01-11 |
ES2616323T3 (es) | 2017-06-12 |
RU2546511C2 (ru) | 2015-04-10 |
TW201036817A (en) | 2010-10-16 |
ES2461845T3 (es) | 2014-05-21 |
HK1164225A1 (en) | 2012-09-21 |
EP2397319A4 (en) | 2012-11-14 |
BRPI1013669B1 (pt) | 2020-02-11 |
EP2857190A1 (en) | 2015-04-08 |
RU2011137528A (ru) | 2013-03-20 |
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