WO2015152345A1 - 粘着シート及び粘着シートの製造方法 - Google Patents
粘着シート及び粘着シートの製造方法 Download PDFInfo
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- WO2015152345A1 WO2015152345A1 PCT/JP2015/060411 JP2015060411W WO2015152345A1 WO 2015152345 A1 WO2015152345 A1 WO 2015152345A1 JP 2015060411 W JP2015060411 W JP 2015060411W WO 2015152345 A1 WO2015152345 A1 WO 2015152345A1
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- pressure
- sensitive adhesive
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Definitions
- the present invention relates to a pressure-sensitive adhesive sheet. More specifically, the present invention relates to a blister-resistant pressure-sensitive adhesive that suppresses the occurrence of blisters such as blisters and floats when applied to the surface of various plastic molded articles, and has a smooth support substrate surface and excellent appearance. It relates to the sheet.
- a pressure-sensitive adhesive sheet in which a pressure-sensitive adhesive (pressure-sensitive adhesive) is applied to a supporting substrate has been widely used in many fields because of its simplicity that it can be easily attached to an adherend by pressing.
- plastic molded products have been frequently used due to demands for weight reduction of products. Accordingly, the use of pressure-sensitive adhesive sheets for attaching to plastic molded products is increasing.
- the plastic molded article include those obtained by molding a resin such as polycarbonate, polymethyl methacrylate, polystyrene, and ABS.
- a pressure-sensitive adhesive sheet for example, pressure-sensitive adhesive label
- a gas-barrier support base When a pressure-sensitive adhesive sheet (for example, pressure-sensitive adhesive label) using a gas-barrier support base is attached to the surface of these plastic molded products, gas is generated from the plastic molded product, and the pressure-sensitive adhesive sheet and plastic molding Bubbles may be formed between the product and blistering or floating, that is, blistering may occur. When such a blister occurs, the appearance of the label is impaired, and the decorative function as the pressure-sensitive adhesive sheet is significantly lowered.
- Patent Document 1 (meth) acrylic acid ester, copolymerizable carboxyl group-containing compound and tertiary amine having a vinyl group are radically polymerized as an adhesive composition.
- An acrylic pressure-sensitive adhesive composition containing a copolymer is disclosed.
- Patent Document 2 discloses a copolymer comprising an acrylic ester having an alkyl group having 4 to 12 carbon atoms and 0.1 to 10% by weight of a polar monomer such as acrylic acid or 2-hydroxyethyl acrylate. It has been proposed as a blister-resistant adhesive sheet using an adhesive obtained by blending an aziridine-based crosslinking agent.
- Patent Document 3 discloses a pressure-sensitive adhesive sheet that includes a pressure-sensitive adhesive component and a curable component that is an acrylic monomer or oligomer as a component that forms a pressure-sensitive adhesive layer, but the curable component is a cohesive force of the pressure-sensitive adhesive layer.
- the adhesive layer may become cloudy if it is reduced or the compatibility with the adhesive component is poor.
- Patent Document 4 a resin composition having a specific molecular weight obtained by copolymerizing a (meth) acrylic acid alkyl ester having 1 to 12 carbon atoms and a carboxyl group-containing unsaturated monomer, and 1 to 20 carbon atoms.
- a specific glass transition temperature obtained by copolymerizing one or two or more monomers selected from methacrylic acid alkyl ester or methacrylic acid cycloalkyl ester, benzyl methacrylate or styrene with an amino group-containing unsaturated monomer (A pressure-sensitive adhesive composition containing Tg) and a resin composition having a specific molecular weight is disclosed.
- Patent Document 5 a (meth) acrylic acid alkyl ester having an alkyl group having 1 to 12 carbon atoms as a main component, a styrene monomer, a carboxyl group-containing unsaturated monomer, and an amino group-containing unsaturated monomer.
- a blister-resistant pressure-sensitive adhesive composition obtained by blending a copolymer having a specific molecular weight obtained by copolymerizing a polymer with a crosslinking agent having a glycidyl group is disclosed.
- Patent Document 6 discloses a resin composition having a weight average molecular weight of 1.5 million or more and a weight average molecular weight / number average molecular weight of 4.0 or less polymerized in acetone.
- JP-A-2-3481 JP-A-8-3521 Japanese Patent Laid-Open No. 10-279900 JP-A-10-310754 JP 2001-335766 A JP 2001-354745 A
- Patent Documents 1 to 6 all of the techniques described in Patent Documents 1 to 6 are limited in pressure-sensitive adhesive composition, crosslinking agent type, molecular weight, etc., and applicable pressure-sensitive adhesives are limited. And blister resistance are difficult to achieve. Under such circumstances, the present invention, when applied to the surface of various plastic molded products, suppresses blisters and floats even when time elapses, that is, the generation of blisters, and the surface of the supporting substrate is smooth and excellent in appearance. In addition, it is an object to provide a pressure-sensitive adhesive sheet that can exhibit excellent blister resistance and can be easily manufactured with any pressure-sensitive adhesive.
- the present inventor has laminated a support substrate, a pressure-sensitive adhesive layer, a continuous void-containing layer composed of a composition containing specific fine particles, and a pressure-sensitive adhesive layer in this order. It has been found that this problem can be solved by a pressure-sensitive adhesive sheet in which the mass concentration of fine particles in the continuous void-containing layer is in a specific range.
- the present invention has been completed based on such findings.
- the present invention (1) A pressure-sensitive adhesive sheet in which a supporting substrate, a pressure-sensitive adhesive layer (X), a continuous void-containing layer made of a composition containing fine particles (excluding silica), and a pressure-sensitive adhesive layer (Y) are laminated in this order.
- the pressure-sensitive adhesive sheet of the present invention is a layer in which a supporting substrate, a pressure-sensitive adhesive layer (X), a continuous void-containing layer containing a specific proportion of fine particles (excluding silica), and a pressure-sensitive adhesive layer (Y) are laminated in this order.
- a pressure-sensitive adhesive sheet that has a smooth support substrate surface and excellent appearance, and exhibits excellent blister resistance and can be easily manufactured regardless of any pressure-sensitive adhesive.
- the pressure-sensitive adhesive sheet of the present invention will be described.
- a support substrate a pressure-sensitive adhesive layer (X), a continuous void-containing layer made of a composition containing fine particles (excluding silica), and a pressure-sensitive adhesive layer (Y) were laminated in this order.
- the mass concentration of the fine particles in the continuous void-containing layer is 45 to 100%.
- the adhesive sheet of this invention should just be what the said adhesive layer (X), the continuous space
- Layers mixed with each other may be formed.
- the mixed layer include, for example, a layer in which components constituting two layers of the pressure-sensitive adhesive layer (X) and the continuous void-containing layer are mixed with each other, and two layers of the continuous void-containing layer and the pressure-sensitive adhesive layer (Y).
- Examples include a layer in which components constituting each other, a layer in which the components constituting the three layers of the pressure-sensitive adhesive layer (X), the continuous void-containing layer, and the pressure-sensitive adhesive layer (Y) are mixed with each other.
- the mixed layer is formed by forming a pressure-sensitive adhesive layer (X) or a continuous void-containing layer, and then forming a continuous void-containing layer or pressure-sensitive adhesive layer that becomes an upper layer by so-called wet-on-wet or wet-on-dry.
- a layer (Y) is mentioned.
- Support base material used in the adhesive sheet of this invention
- the various base material conventionally used as a support base material of an adhesive sheet can be used.
- a supporting substrate include plastic films such as polyethylene terephthalate films, polybutylene terephthalate films, polyester films such as polyethylene naphthalate films, polyethylene films, polypropylene films, polyvinyl chloride films, polyvinylidene chloride films, polyvinyl alcohol films.
- Ethylene-vinyl acetate copolymer film Ethylene-vinyl acetate copolymer film, polystyrene film, polycarbonate film, polymethylpentene film, polysulfone film, polyether ether ketone film, polyether sulfone film, polyphenylene sulfide film, polyether imide film, polyimide film, fluororesin film , Polyamide film, acrylic resin film, norvo Nene resin film, and a cycloolefin resin film.
- a polyethylene terephthalate film is preferable.
- a polyethylene naphthalate film, a polyimide film, or a polyetherimide film having a high glass transition point (Tg) can be used.
- weather resistant polyvinyl chloride films polyvinylidene chloride films, fluororesin films, and acrylic resin films can be used.
- the thickness of the plastic film is not particularly limited, and is usually about 5 to 200 ⁇ m, preferably 25 to 120 ⁇ m, more preferably 30 to 90 ⁇ m, and still more preferably 40 to 60 ⁇ m.
- the support substrate in the present invention is preferably a non-breathable substrate in which the effect of the present invention of suppressing blisters appears more clearly.
- a substrate having a metal layer on the above-described plastic film can be used as the non-breathable substrate.
- the metal layer is formed by, for example, a method of depositing a metal having a metallic luster, specifically, aluminum, tin, chromium, titanium or the like by a PVD method such as vacuum deposition, sputtering, or ion plating, or a metal having a metallic luster.
- a method of sticking a foil, specifically, an aluminum foil, a tin foil, a chrome foil, a titanium foil or the like through various commonly used pressure-sensitive adhesive layers can be employed.
- the method of vapor-depositing a metal having a metallic luster is advantageous from the viewpoint of the appearance and economics of the obtained pressure-sensitive adhesive sheet.
- these plastic films can be subjected to a surface treatment or a primer treatment by an oxidation method, a concavo-convex method or the like, if desired, for the purpose of improving the adhesion with a layer provided on the surface.
- the oxidation method include corona discharge treatment, plasma discharge treatment, chromic acid treatment (wet), hot air treatment, ozone, and ultraviolet irradiation treatment.
- the unevenness method include a sand blast method and a solvent treatment. Law.
- These surface treatment methods are appropriately selected according to the type of the plastic film, but in general, the corona discharge treatment method is preferably used from the viewpoints of effects and operability.
- the continuous void-containing layer constituting the pressure-sensitive adhesive sheet of the present invention is a layer comprising a composition containing fine particles (excluding silica), and the void-containing layer.
- the mass concentration of fine particles in the layer needs to be 45 to 100%, preferably 50 to 98%, more preferably 55 to 95%, still more preferably 65 to 92%, and still more preferably 70 to 90%. is there.
- By controlling the mass concentration of the fine particles in the above range it is possible to obtain a pressure-sensitive adhesive sheet that suppresses the generation of blisters and has a smooth support substrate surface and excellent appearance.
- the total mass of the continuous void-containing layer refers to the total mass of the total solid content of the coating solution for the continuous void-containing layer that forms the continuous void-containing layer.
- the thickness increase rate due to the voids of the void-containing layer is preferably 110 to 200%, more preferably 120 to 190%, still more preferably 135 to 180%, and more preferably 140 to 170%. It is even more preferable.
- the thickness increment rate due to the voids in the void-containing layer is within the above range, the gas generated from the plastic molded product is easily released, the blister resistance of the pressure-sensitive adhesive sheet is excellent, and the sheet can be easily manufactured. Become.
- the fine particles as a material for forming the continuous void-containing layer are actually composed of primary particles and / or secondary particles.
- the voids in the continuous void-containing layer include voids that exist between primary particles of fine particles and voids that exist in secondary particles, but in the case of secondary particles, they exist between secondary particles. It includes not only voids but also voids present in secondary particles. Therefore, in the continuous void-containing layer, voids that exist between the secondary particles and voids that exist in the secondary particles communicate with each other as continuous voids to form voids (micropores).
- micropores There is also a region, and voids that exist between primary particles and voids that exist between secondary particles and / or voids that exist in secondary particles communicate with each other to form pores (micropores). There are some areas. Since these continuous voids form voids that are continuous in the thickness direction, a sufficient air passage can be secured, and blisters can be prevented.
- the fine particles (excluding silica) used in the present invention are not particularly limited as long as they can form the above-mentioned continuous void layer, and known fine particles can be used.
- Examples of such fine particles include inorganic particles such as metals, metal oxides, minerals, calcium carbonate, magnesium carbonate, calcium sulfate, barium sulfate, aluminum hydroxide, aluminum silicate, calcium silicate, and magnesium silicate, and organic particles such as acrylic beads.
- the metal refers to Group 1 (excluding H), Group 2 to 11, Group 12 (excluding Hg), Group 13 (excluding B), and Group 14 (excluding C and Si) in the periodic table.
- the metal oxide preferably include alumina and boehmite.
- Preferred examples of minerals include smectite and bentonite. Examples of the smectite include montmorillonite, beidellite, hectorite, saponite, stevensite, nontronite, and soconite.
- one or more selected from metal oxide and smectite more preferably one or more selected from alumina, boehmite and smectite, more preferably alumina, boehmite, And one or more selected from hectorite.
- the median diameter of the fine particles (excluding silica) as a material for forming the void-containing layer is preferably 0.001 to 100 ⁇ m, more preferably 0.05 to 25 ⁇ m, and still more preferably 0.1 to 10 ⁇ m. If the median diameter of the fine particles (excluding silica) is 0.001 ⁇ m or more, the air gap can be formed to such an extent that the air escape property is effective. Further, when the median diameter of the fine particles (excluding silica) is 100 ⁇ m or less, the fine particles do not protrude from the void-containing layer, the shape is stable to the extent that it can be used as an adhesive sheet, and the handling property is excellent.
- the median diameter of the fine particles can be obtained by measuring the particle size distribution by a laser scattering method using a laser diffraction / scattering particle size distribution measuring device (product name “LA-920” manufactured by Horiba, Ltd.).
- the median diameter is preferably 0.05 to 10 ⁇ m, more preferably 0.1 to 5 ⁇ m, still more preferably 0.3 to 3 ⁇ m.
- the median diameter is preferably 0.05 to 10 ⁇ m, more preferably 0.1 to 8 ⁇ m, and still more preferably 0.3 to 7 ⁇ m.
- the median diameter is preferably 0.001 to 100 ⁇ m, more preferably 0.005 to 80 ⁇ m, and still more preferably 0.01 to 60 ⁇ m.
- the average length of the long side of the smectite is preferably 0.002 to 100 ⁇ m, more preferably 0.01 to 80 ⁇ m.
- the average length of the short side of the smectite is preferably 0.001 to 70 ⁇ m, more preferably 0.005 to 60 ⁇ m.
- the smectite In the case of smectite, it may be oriented parallel to the surface direction when formed into a sheet, and in that case, the median diameter may be larger than the thickness of the pressure-sensitive adhesive layer. Further, the average aspect ratio [long side length (H) / short side length (L)] of the smectite is preferably 1.1 to 10, and more preferably 1.3 to 3. Two or more kinds of these fine particles may be used in combination.
- the continuous void-containing layer is a result of the influence of the bulk of the sticky substance over the adhesiveness of the interface between the continuous void-containing layer and the pressure-sensitive adhesive layer, as well as the non-sticky substance at the same thickness.
- a pressure-sensitive adhesive as a component because it is easy to obtain a large adhesive force to the adherend.
- the pressure-sensitive adhesive constituting the continuous void-containing layer is not particularly limited, and various types of pressure-sensitive adhesives such as rubber-based pressure-sensitive adhesives, silicone-based pressure-sensitive adhesives, and acrylic pressure-sensitive adhesives can be used. From the viewpoints of performance and weather resistance, an acrylic pressure-sensitive adhesive is preferred.
- the pressure-sensitive adhesive may be either a solvent type or an emulsion type. In addition, you may make a solvent type adhesive contain a crosslinking agent as needed.
- (co) polymers having the following structural units for example, a (co) polymer having a structural unit derived from an alkyl (meth) acrylate having a linear or branched alkyl group, or derived from a (meth) acrylate having a cyclic structure
- (co) polymers having the following structural units for example, a (co) polymer having a structural unit derived from an alkyl (meth) acrylate having a linear or branched alkyl group, or derived from a (meth) acrylate having a cyclic structure
- (co) polymers having the following structural units for example, a (co) polymer having a structural unit derived from an alkyl (meth) acrylate having a linear or branche
- the acrylic pressure-sensitive adhesive preferably contains a (meth) acrylic acid ester-based (co) polymer having a weight average molecular weight of 100,000 to 1,500,000 as a pressure-sensitive adhesive component, and also contains a crosslinking agent, and has a porosity of From the viewpoint, the shear storage modulus at 100 ° C. of the pressure-sensitive adhesive after crosslinking is preferably 9.0 ⁇ 10 3 Pa or more, more preferably 1.0 ⁇ 10 4 Pa or more, and further preferably 2.0 ⁇ 10 4. Pa or higher. When the shear storage modulus is 9.0 ⁇ 10 3 Pa or more, voids can be maintained, and thus the blister resistance is excellent.
- the shear storage modulus is determined by measuring at a frequency of 1 Hz using a viscoelasticity measuring device (manufactured by Rheometrics, device name: DYNAMIC ANALYZER RDA II). Further, from the viewpoint of adhesion at the interface between the continuous void-containing layer and the pressure-sensitive adhesive layer, it is preferable to use the same adhesive as that used in the pressure-sensitive adhesive layer described later as the pressure-sensitive adhesive constituting the continuous void-containing layer.
- crosslinking agent examples include polyisocyanate compounds, epoxy resins, melamine resins, urea resins, dialdehydes, methylol polymers, aziridine compounds, metal alkoxides, metal salts, and the like, but polyisocyanate compounds are preferably used. It is done.
- the crosslinking agent is preferably 0 to 30 parts by mass, more preferably 0.01 to 15 parts by mass, and still more preferably 100 parts by mass of the solid content of the (meth) acrylic acid ester (co) polymer. Can be blended in an amount of 0.5 to 10 parts by weight, more preferably 2 to 7 parts by weight.
- examples of the polyisocyanate compound include aromatic polyisocyanates such as tolylene diisocyanate, diphenylmethane diisocyanate and xylylene diisocyanate, aliphatic polyisocyanates such as hexamethylene diisocyanate, and isophorone diisocyanate.
- aromatic polyisocyanates such as tolylene diisocyanate, diphenylmethane diisocyanate and xylylene diisocyanate
- aliphatic polyisocyanates such as hexamethylene diisocyanate
- isophorone diisocyanate Nalto, cycloaliphatic polyisocyanates such as hydrogenated diphenylmethane diisocyanate, and the like, and biurets, isocyanurates, and low molecules such as ethylene glycol, propylene glycol, neopentyl glycol, trimethylolpropane, castor oil, etc.
- the acrylic pressure-sensitive adhesive used in the present invention may contain a general-purpose additive as long as the effects of the present invention are not impaired.
- General-purpose additives include, for example, tackifiers, antioxidants, softeners (plasticizers), fillers, rust inhibitors, pigments, dyes, retarders, reaction accelerators, ultraviolet absorbers, and the like.
- the content of each general-purpose additive is preferably 0.0001 to 60 parts by mass, more preferably 0.001 to 50 parts per 100 parts by mass of the solid content of the pressure-sensitive adhesive. Part by mass.
- the thickness of the continuous void-containing layer is preferably 5 to 100 ⁇ m, more preferably 7 to 50 ⁇ m, still more preferably 10 to 30 ⁇ m, and still more preferably 15 to 25 ⁇ m.
- the thickness of the continuous void-containing layer is 5 ⁇ m or more, a sufficient thickness for filling the fine particles can be secured, and a continuous void-containing layer with few irregularities can be formed. Moreover, blister resistance can be secured.
- the thickness of the continuous void-containing layer is 100 ⁇ m or less, the amount of fine particles used can be suppressed, which is economically preferable.
- gap content layer is formed by apply
- FIG. 1 is a schematic cross-sectional view showing an example of the configuration of the pressure-sensitive adhesive sheet of the present invention.
- the pressure-sensitive adhesive sheet 10 of the present invention has a metal layer 2 on its surface.
- the pressure-sensitive adhesive layer (X) 3 the continuous void-containing layer 4, the pressure-sensitive adhesive layer (Y) 5, and the release sheet 6 are sequentially laminated.
- the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer (X) and the pressure-sensitive adhesive layer (Y) is not particularly limited because the pressure-sensitive adhesive layer itself does not require a blister resistance function.
- Various types of pressure-sensitive adhesives such as rubber-based pressure-sensitive adhesives, silicone-based pressure-sensitive adhesives, and acrylic pressure-sensitive adhesives can be used, and acrylic pressure-sensitive adhesives are preferable from the viewpoint of performance as a pressure-sensitive adhesive and weather resistance.
- the pressure-sensitive adhesive may be either a solvent type or an emulsion type. In addition, you may contain a crosslinking agent as needed.
- the thickness of the pressure-sensitive adhesive layer (X) and the pressure-sensitive adhesive layer (Y) in the pressure-sensitive adhesive sheet of the present invention is preferably 5 to 50 ⁇ m, more preferably 7 to 35 ⁇ m, and still more preferably 10 to 30 ⁇ m.
- the ratio of the thickness of the pressure-sensitive adhesive layer (X) to the continuous void-containing layer [pressure-sensitive adhesive layer (X) / continuous void-containing layer] is preferably 0.05 from the viewpoint of achieving both excellent appearance and blister resistance. -10, more preferably 0.1-5, still more preferably 0.2-2, and still more preferably 0.3-0.8.
- the ratio of the thickness of the pressure-sensitive adhesive layer (Y) to the continuous void-containing layer [pressure-sensitive adhesive layer (Y) / continuous void-containing layer] is preferably 0 from the viewpoint of achieving both excellent appearance and blister resistance. .05 to 10, more preferably 0.1 to 5, still more preferably 0.2 to 2, and still more preferably 0.3 to 0.8.
- the two pressure-sensitive adhesive layers (X) and the pressure-sensitive adhesive layer (Y) may have the same composition or different compositions.
- the composition of the pressure-sensitive adhesive layer is not particularly limited, but the same pressure-sensitive adhesive as that used in the above-mentioned continuous void-containing layer may be used.
- the pressure-sensitive adhesive sheet production method of the present invention is a pressure-sensitive adhesive sheet production method in which a supporting substrate, a pressure-sensitive adhesive layer (X), a continuous void-containing layer, and a pressure-sensitive adhesive layer (Y) are laminated in this order. At least two layers of the layer (X), the continuous void-containing layer, and the pressure-sensitive adhesive layer (Y) are simultaneously applied by a multilayer coater.
- the simultaneously applied layers are at least two layers of the pressure-sensitive adhesive layer (X), the continuous void-containing layer, and the pressure-sensitive adhesive layer (Y), and the pressure-sensitive adhesive layer (X) and the continuous void-containing layer It is preferable to apply three layers of the pressure-sensitive adhesive layer (Y) at the same time.
- the simultaneous application may be applied directly on the support substrate, or may be applied to the release treatment surface of the release sheet for protecting the adhesive layer described later.
- examples of the coater used for simultaneous application with a multilayer coater include a curtain coater and a die coater. Among these, a die coater is preferable from the viewpoint of operability.
- the pressure-sensitive adhesive sheet production method II of the present invention is a pressure-sensitive adhesive sheet production method in which a supporting substrate, a pressure-sensitive adhesive layer (X), a continuous void-containing layer, and a pressure-sensitive adhesive layer (Y) are laminated in this order. Each of the agent layer (X), the continuous void-containing layer, and the pressure-sensitive adhesive layer (Y) is laminated by bonding.
- the thickness after drying a predetermined pressure-sensitive adhesive on the release treatment surface of the release sheet is preferably 5 to 50 ⁇ m, more preferably 7 to 35 ⁇ m, and even more.
- a pressure-sensitive adhesive sheet with a release sheet is prepared by applying and drying by a conventionally known method so that the thickness is preferably 10 to 30 ⁇ m, and then this is bonded to a continuous void-containing layer and a laminate roll.
- the coater used for forming and applying each layer is, for example, an air knife coater, a blade coater, a bar coater, a gravure coater, a roll coater, a roll knife coater, a curtain coater, a die coater, or a knife coater. , Screen coaters, Meyer bar coaters, kiss coaters, etc., among these, roll knife coaters and die coaters are preferred from the viewpoint of operability.
- a step of drying these layers is performed.
- the drying temperature is preferably 35 to 200 ° C.
- the manufacturing method shown below that is, the support substrate, the pressure-sensitive adhesive layer (X), the continuous void-containing layer, and the pressure-sensitive adhesive layer (Y) is a method for manufacturing a pressure-sensitive adhesive sheet laminated in this order.
- a method in which at least two layers of (X), the continuous void-containing layer, and the pressure-sensitive adhesive layer (Y) are laminated by a wet-on-wet or wet-on-dry process that is not simultaneous multilayer coating can also be used.
- the wet-on-wet process is, for example, a method in which a coating liquid for forming a pressure-sensitive adhesive layer (X) is applied, and a coating liquid for forming a continuous void-containing layer is further applied thereon without drying. is there.
- the wet-on-dry process refers to, for example, applying a coating solution for forming an adhesive layer (X), applying a coating solution for forming a continuous void-containing layer thereon, and then drying the adhesive layer ( Y) A method of applying a forming coating solution.
- stacking a support base material later can also be used.
- the base material-less pressure-sensitive adhesive sheet may be provided with a release sheet described later for protecting the pressure-sensitive adhesive layer.
- the release sheet used in the method for producing the pressure-sensitive adhesive sheet described above for example, films made of various resins such as polyethylene terephthalate, polybutylene terephthalate, polyethylene, polypropylene, polyacrylate, polyethylene laminated paper, polypropylene laminated paper, clay coated paper, Various paper materials such as resin-coated paper, glassine paper, and high-quality paper can be used as the base material, and the surface of the base material bonded to the pressure-sensitive adhesive layer can be peeled off if necessary.
- the release treatment include formation of a release agent layer made of a release agent such as a silicone resin, a long-chain alkyl resin, and a fluorine resin.
- the thickness of the release sheet is not particularly limited, but is usually 20 to 200 ⁇ m, preferably 25 to 180 ⁇ m, more preferably 35 to 170 ⁇ m.
- the obtained adhesive sheet of this invention is affixed on plastic molded articles, such as a polycarbonate, a polymethylmethacrylate, a polystyrene, an ABS resin, and can suppress generation
- ⁇ Blister resistance evaluation> The adhesive sheet of 50 mm ⁇ 50 mm is peeled off and the pressure-sensitive adhesive sheet is pressure-bonded to a 2 mm-thick 70 mm ⁇ 150 mm polymethyl methacrylate plate [Mitsubishi Rayon Co., Ltd. “Acrylite L001”] using a squeegee at 23 ° C. After being left for 12 hours, left in a hot air dryer at 80 ° C. for 1.5 hours, and then left in a hot air dryer at 90 ° C. for 1.5 hours to observe the state of blistering after heating was promoted, Evaluation was made according to the following criteria. A: No blisters were visually confirmed. B: Blisters were partially confirmed visually. C: Blister was visually confirmed on the entire surface.
- the median diameter of the fine particles (excluding silica) used as the material for forming the continuous void-containing layer is determined by using a laser diffraction / scattering type particle size distribution measuring device (product name “LA-920” manufactured by Horiba, Ltd.) It was determined by measuring the particle size distribution by the laser scattering method.
- ⁇ Measurement of thickness increment rate and mass concentration of fine particles Further, the thickness increment rate due to the continuous void-containing layer voids and the mass concentration of the fine particles (excluding silica) were calculated by the equations (1) and (2) described in the specification text, respectively.
- BA butyl acrylate
- a polyethylene terephthalate film (product name “FNS Poppy N50”, manufactured by Lintec Co., Ltd., thickness 50 ⁇ m) provided with an aluminum vapor deposition layer on one side is used as a supporting substrate, and a release film [product name “SP-, manufactured by LINTEC Co., Ltd., is used as a release sheet].
- PET 381130 thickness 38 ⁇ m] was used.
- the pressure-sensitive adhesive layer-forming coating solution (A) is applied to the release-treated surface of this release sheet with a roll coater so that the thickness after drying is 10 ⁇ m, dried at 100 ° C. for 2 minutes, and then a laminate roll is used.
- the pressure-sensitive adhesive sheet (I) was produced by pasting together with the aluminum vapor-deposited surface of the support substrate.
- the continuous void-containing layer coating liquid (B) was applied to the release treatment surface of the release sheet prepared separately from the above with a roll coater so that the thickness after drying was 20 ⁇ m, and dried at 100 ° C. for 2 minutes.
- the pressure-sensitive adhesive sheet (II) was prepared by pasting the pressure-sensitive adhesive sheet (I) on the surface of the pressure-sensitive adhesive layer forming coating liquid (A) on the dry film side.
- the pressure-sensitive adhesive layer forming coating solution (A) was applied to the release treatment surface of the release sheet prepared separately from the above by a roll coater so that the thickness after drying was 10 ⁇ m, and dried at 100 ° C. for 2 minutes. Then, the adhesive sheet of Example 1 was produced by laminating the surface of the pressure-sensitive adhesive sheet (II) on the dry film side of the coating solution (B) for the continuous void-containing layer using a laminate roll.
- the mass concentration of alumina particles in the continuous void-containing layer was 70%, and the thickness increment rate due to voids was 123%.
- Examples 2-8, Comparative Examples 2-3 A pressure-sensitive adhesive sheet was produced in the same manner as in Example 1 except that the type of fine particles, the mass part of the fine particles, and the fine particle mass concentration were changed to those described in Table 1. As fine particles, alumina, boehmite, and smectite shown below were used.
- Example 9 In Example 8, the pressure-sensitive adhesive layer-forming coating liquid (A) and the continuous void-containing layer coating liquid (A) and the continuous void-containing layer coating liquid (A) are arranged in this order on the release treatment surface of the release sheet.
- a pressure-sensitive adhesive sheet was prepared in the same manner as in Example 8 except that three layers were simultaneously applied using a multilayer die coater using B).
- Comparative Example 1 The adhesive layer coating liquid (A) is applied to the release-treated surface of the release sheet “SP-PET381130” (described above) with a roll coater, and dried at 100 ° C. for 1 minute to give a 40 ⁇ m thick adhesive layer. And using a laminate roll, an adhesive sheet was prepared by laminating it with the aluminum vapor-deposited surface of the support substrate “FNS Poppy N50” (supra). The fine particle mass concentration in the pressure-sensitive adhesive layer of this pressure-sensitive adhesive sheet was 0%.
- the blister resistance of the pressure-sensitive adhesive sheets obtained in the above examples was evaluated.
- the results are shown in Table 1 together with the type of fine particles in the continuous void-containing layer, the fine particle mass concentration, and the thickness increment rate due to the voids.
- FIG. 2 shows an electron microscope image of a cross section of the continuous void-containing layer formed in Example 4 (mass concentration of boehmite particles 80%).
- FIG. 3 shows an electron microscope image of a cross section of the layer formed in Comparative Example 3 (mass concentration of boehmite particles 40%).
- Example 4 continuous voids were formed, whereas in Comparative Example 3 (mass concentration of boehmite particles 40%), no continuous voids were formed.
- a field emission scanning electron microscope “S-4700” manufactured by Hitachi, Ltd. was used, and the acceleration voltage was 15 kV.
- the adhesive sheet of the present invention when affixed to the surface of various plastic molded products, suppresses blisters and floats over time, i.e., the generation of blisters, the support substrate surface is smooth and excellent in appearance, and any Even pressure-sensitive adhesives exhibit excellent blister resistance and are easy to manufacture.
- Adhesive sheet 1 Supporting substrate 2 Metal layer 3 Adhesive layer (X) 4 Continuous void content layer 5 Adhesive layer (Y) 6 Release sheet 10 Adhesive sheet
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Abstract
Description
これらのプラスチック成形品の表面に装飾等の理由でガスバリア性のある支持基材を用いた粘着シート(例えば、粘着ラベル)を貼付した場合、プラスチック成形品からガスが発生し、粘着シートとプラスチック成形品との間に気泡が形成され、膨れや浮き、すなわち、ブリスターが生じる場合がある。このようなブリスターが発生すると、ラベルの外観が損なわれ、粘着シートとしての装飾機能が著しく低下してしまう。
また、特許文献2には、炭素数4~12のアルキル基を有するアクリル酸エステルとアクリル酸やアクリル酸-2-ヒドロキシエチルのような極性モノマー0.1~10重量%よりなる共重合体にアジリジン系架橋剤を配合してなる粘着剤を用いた耐ブリスター性粘着シートとして提案されている。
さらに、特許文献4では、炭素数1~12の(メタ)アクリル酸アルキルエステルとカルボキシル基含有不飽和モノマーを共重合して得られた特定の分子量を有する樹脂組成物と、炭素数1~20のメタクリル酸アルキルエステルもしくはメタクリル酸シクロアルキルエステル、メタクリル酸ベンジル又はスチレンから選ばれた1種又は2種以上のモノマーとアミノ基含有不飽和モノマーを共重合して得られた特定のガラス転移温度(Tg)及び特定の分子量を有する樹脂組成物とを配合する粘着剤組成物が開示されている。
特許文献6ではアセトン中で重合された重量平均分子量150万以上かつ重量平均分子量/数平均分子量が4.0以下である樹脂組成物が開示されている。
本発明は、このような状況下において、各種プラスチック成形品の表面に貼付した場合、時間が経過しても膨れや浮き、すなわちブリスターの発生を抑制し、支持基材表面が平滑で外観に優れ、かつ、いかなる粘着剤であっても、優れた耐ブリスター性を示すことができ、さらに製造の容易な粘着シートを提供することを課題とする。
(1)支持基材、粘着剤層(X)、微粒子(ただしシリカを除く)を含有する組成物よりなる連続空隙含有層、及び粘着剤層(Y)がこの順に積層された粘着シートであって、前記連続空隙含有層中の微粒子の質量濃度が45~100%である粘着シート、
(2)連続空隙含有層が、空隙による厚み増分率110~200%である、上記(1)に記載の粘着シート、
(3)連続空隙含有層を形成する材料となる微粒子が、酸化金属及びスメクタイトから選ばれる1種以上である、上記(1)又は(2)に記載の粘着シート、
(4)支持基材、粘着剤層(X)、連続空隙含有層、粘着剤層(Y)が、この順に積層された粘着シートの製造方法であって、粘着剤層(X)、連続空隙含有層、粘着剤層(Y)の少なくとも2層以上が、多層コーターで同時塗布される、上記(1)~(3)のいずれかに記載の粘着シートの製造方法、
(5)支持基材、粘着剤層(X)、連続空隙含有層、粘着剤層(Y)が、この順に積層された粘着シートの製造方法であって、粘着剤層(X)、連続空隙含有層、粘着剤層(Y)の各々が、貼合により積層される、上記(1)~(3)のいずれかに記載の粘着シートの製造方法、
を提供するものである。
本発明の粘着シートは、支持基材、粘着剤層(X)、微粒子(ただしシリカを除く)を含有する組成物よりなる連続空隙含有層、及び粘着剤層(Y)がこの順に積層された粘着シートであって、前記連続空隙含有層中の微粒子の質量濃度が45~100%である。
なお、本発明の接着シートは、前記粘着剤層(X)、連続空隙含有層、及び粘着剤層(Y)がこの順に積層されたものであればよく、各層を構成する成分が各層の界面において互いに混合されている層(以下、「混層」ともいう)が形成されていてもよい。
該混層の態様としては、例えば、粘着剤層(X)と連続空隙含有層の2層を構成する成分が互いに混合されている層、連続空隙含有層と粘着剤層(Y)の2層を構成する成分が互いに混合されている層、前記粘着剤層(X)、連続空隙含有層、及び粘着剤層(Y)の3層を構成する成分が互いに混合されている層等が挙げられる。該混層を形成する方法としては、粘着剤層(X)又は連続空隙含有層を形成したのち、いわゆるwet-on-wet又はwet-on-dryでこれらの上層となる連続空隙含有層又は粘着剤層(Y)を形成する方法が挙げられる。
本発明の粘着シートにおいて用いられる支持基材としては、特に制限はなく、従来、粘着シートの支持基材として用いられている各種の基材を使用することができる。このような支持基材としては、プラスチックフィルム、例えばポリエチレンテレフタレートフィルム、ポリブチレンテレフタレートフィルム、ポリエチレンナフタレートフィルム等のポリエステルフィルム、ポリエチレンフィルム、ポリプロピレンフィルム、ポリ塩化ビニルフィルム、ポリ塩化ビニリデンフィルム、ポリビニルアルコールフィルム、エチレン-酢酸ビニル共重合体フィルム、ポリスチレンフィルム、ポリカーボネートフィルム、ポリメチルペンテンフィルム、ポリスルホンフィルム、ポリエーテルエーテルケトンフィルム、ポリエーテルスルホンフィルム、ポリフェニレンスルフィドフィルム、ポリエーテルイミドフィルム、ポリイミドフィルム、フッ素樹脂フィルム、ポリアミドフィルム、アクリル樹脂フィルム、ノルボルネン系樹脂フィルム、シクロオレフィン樹脂フィルム等を挙げることができる。
これらの中で、ポリエチレンテレフタレートフィルムが好ましい。また、耐熱性等が要求される用途では、ガラス転移点(Tg)の高いポリエチレンナフタレートフィルム、ポリイミドフィルム、ポリエーテルイミドフィルムを使用することができる。さらに、耐候性等が要求される用途では、耐候性を有するポリ塩化ビニルフィルム、ポリ塩化ビニリデンフィルム、フッ素樹脂フィルム、アクリル樹脂フィルムを使用することができる。
このプラスチックフィルムの厚みについては、特に制限はなく、通常5~200μm程度、好ましくは25~120μm、より好ましくは30~90μm、より更に好ましくは40~60μmである。
本発明における前記支持基材は、ブリスターを抑制するという本発明の効果がより一層明確に現れる非通気性基材であることが好ましい。
この非通気性基材としては、前記したプラスチックフィルム上に金属層を有する基材を用いることができる。該金属層の形成は、例えば金属光沢を有する金属、具体的にはアルミニウム、スズ、クロム、チタン等を真空蒸着、スパッタリング、イオンプレーティング等のPVD法により蒸着する方法、あるいは金属光沢を有する金属箔、具体的にはアルミニウム箔、スズ箔、クロム箔、チタン箔等を、通常用いられる各種の粘着剤層を介して貼付する方法等を採用することができる。特に、金属光沢を有する金属を蒸着する方法が、得られる粘着シートの外観や経済性等の観点から、有利である。
本発明の粘着シートを構成する連続空隙含有層(以下、単に空隙含有層と称することがある。)は、微粒子(ただしシリカを除く)を含有する組成物よりなる層であって、当該空隙含有層における微粒子の質量濃度は45~100%であることを要し、好ましくは50~98%、より好ましくは55~95%、更に好ましくは65~92%、より更に好ましくは70~90%である。上記微粒子の質量濃度を上記範囲とすることで、ブリスターの発生を抑制すると共に、支持基材表面が平滑で外観に優れる粘着シートを得ることができる。
なお、当該空隙含有層における微粒子の質量濃度は、下記式(2)
微粒子の質量濃度=[微粒子質量/連続空隙含有層の合計質量]×100 ・・・(2)
により、算出することができる。連続空隙含有層の合計質量とは、連続空隙含有層を形成する連続空隙含有層用コーティング液の全固形分の合計質量をいう。
当該空隙含有層の空隙による厚み増分率は、110~200%であることが好ましく、120~190%であることがより好ましく、135~180%であることが更に好ましく、140~170%であることがより更に好ましい。
空隙含有層の空隙による厚み増分率が上記範囲内であると、プラスチック成形品等から発生したガスが抜け易くなり、当該粘着シートの耐ブリスター性が優れたものとなり、またシートの製造が容易となる。
当該空隙含有層の空隙による厚み増分率は、以下のようにして算出することができる。
まず、塗布量測定値を乾燥塗膜比重で割ることにより、空隙がない場合の膜厚(下線部)を算出し、下記式(1)のように測定膜厚を空隙がない場合の膜厚で割ることにより空隙による厚み増分率を算出する。
空隙による厚み増分率(%)=測定膜厚×100/(塗布量測定値/乾燥塗膜比重)・・・(1)
なお、測定膜厚とは、空隙含有層の厚みを、JIS K 7130に準じて、定圧厚さ測定器(テクロック社製、製品名「PG-02」)で測定した値である。また塗布量とは、空隙含有層の単位面積当たりの乾燥質量である。また乾燥塗膜比重とは、材質毎の比重の質量分率より算出した値である。
連続空隙含有層を形成する材料となる微粒子は、実際には、一次粒子、及び/又は二次粒子から構成されている。連続空隙含有層における空隙とは、微粒子の一次粒子同士の間に存在する空隙、及び二次粒子内に存在する空隙も含むが、二次粒子の場合は、二次粒子同士の間に存在する空隙のみではなく、二次粒子内に存在する空隙も含んでいる。それゆえ、連続空隙含有層には、連続空隙として、二次粒子同士の間に存在する空隙と、二次粒子内に存在する空隙とが連通して空孔(微細孔)を形成している領域もあり、一次粒子同士の間に存在する空隙と、二次粒子同士の間に存在する空隙及び/又は二次粒子内に存在する空隙とが、連通して空孔(微細孔)を形成している領域もある。これらの連続空隙が、厚さ方向に連続する空隙を形成することにより、通気路を十分に確保できるため、ブリスターを防止することができる。
本発明で用いる微粒子(ただしシリカを除く)は、上記連続空隙層を形成可能な微粒子であれば特に制限はなく、公知の微粒子を使用することができる。
このような微粒子としては、例えば、金属、酸化金属、鉱物、炭酸カルシウム、炭酸マグネシウム、硫酸カルシウム、硫酸バリウム、水酸化アルミニウム、珪酸アルミニウム、珪酸カルシウム、珪酸マグネシウム等の無機粒子、アクリルビーズ等の有機粒子が挙げられる。
なお、本発明における金属とは、周期表における1族(Hを除く)、2~11族、12族(Hgを除く)、13族(Bを除く)、14族(C、及びSiを除く)、15族(N、P、As、及びSbを除く)、又は16族(O、S、Se、Te、及びPoを除く)に属する元素をいう。
酸化金属の具体例としては、例えば、アルミナ、ベーマイト等が好ましく挙げられる。
鉱物の具体例としては、スメクタイト、ベントナイト等が好ましく挙げられる。
スメクタイトとしては、例えば、モンモリロナイト、バイデライト、ヘクトライト、サポナイト、スチブンサイト、ノントロナイト、ソーコナイト等が挙げられる。
これらの微粒子の中でも、耐ブリスター性の観点から、好ましくは酸化金属、及びスメクタイトから選ばれる1種以上、より好ましくはアルミナ、ベーマイト、及びスメクタイトから選ばれる1種以上、更に好ましくはアルミナ、ベーマイト、及びヘクトライトから選ばれる1種以上である。
当該空隙含有層を形成する材料となる微粒子がアルミナの場合、メジアン径は、好ましくは0.05~10μm、より好ましくは0.1~5μm、更に好ましくは0.3~3μmである。
当該空隙含有層を形成する材料となる微粒子がベーマイトの場合、メジアン径は、好ましくは0.05~10μm、より好ましくは0.1~8μm、更に好ましくは0.3~7μmである。
当該空隙含有層を形成する材料となる微粒子がスメクタイトの場合、メジアン径は、好ましくは0.001~100μm、より好ましくは0.005~80μm、更に好ましくは0.01~60μmである。また微粒子がスメクタイトの場合、スメクタイトの長辺の長さの平均は、好ましくは0.002~100μm、より好ましくは0.01~80μmである。また、スメクタイトの短辺の長さの平均は、好ましくは0.001~70μm、より好ましくは0.005~60μmである。スメクタイトの場合はシートとした際に面方向に平行に配向してもよく、その場合は粘着剤層の厚みよりも大きいメジアン径であってもよい。また、スメクタイトの平均アスペクト比〔長辺の長さ(H)/短辺の長さ(L)〕は、好ましくは1.1~10、より好ましくは1.3~3である。
なおこれらの微粒子は2種類以上を併用してもよい。
当該連続空隙含有層は、連続空隙含有層と粘着剤層の界面の密着性、ならびに同じ厚みの場合に粘着性を有さない物質よりも粘着性を有する物質の方がバルクの影響により結果的に被着体に対して大きな粘着力を得やすいため、成分として粘着剤を含有することが好ましい。
当該連続空隙含有層を構成する粘着剤としては、特に制限はなく、様々な種類の粘着剤、例えばゴム系粘着剤、シリコーン系粘着剤及びアクリル系粘着剤等を用いることができるが、粘着剤としての性能及び耐候性等の観点から、アクリル系粘着剤が好ましい。また、前記粘着剤は、溶媒型、エマルション型のいずれであってもよい。なお、溶媒型粘着剤には、必要に応じて架橋剤を含有させてもよい。
なお、(メタ)アクリレートは、アクリレート及びメタクリレートから選ばれる1種以上を意味し、(共)重合体とは、重合体及び共重合体から選ばれる1種以上を意味する。
前記アクリル系粘着剤は、粘着成分として、重量平均分子量が10万~150万である(メタ)アクリル酸エステル系(共)重合体を含むと共に、架橋剤を含むものが好ましく、かつ空隙率の観点から、架橋後の粘着剤の100℃における剪断貯蔵弾性率が、好ましくは9.0×103Pa以上、より好ましくは1.0×104Pa以上、更に好ましくは2.0×104Pa以上である。剪断貯蔵弾性率が9.0×103Pa以上であると、空隙を維持することができるため、耐ブリスター性が優れたものとなる。
剪断貯蔵弾性率は、粘弾性測定装置(Rheometrics社製,装置名:DYNAMIC ANALYZER RDA II)を用いて、周波数1Hzで測定することにより求められる。
また、連続空隙含有層と粘着剤層の界面の密着性の観点から、連続空隙含有層を構成する粘着剤としては後述の粘着剤層で用いるものと同じものを用いることが好ましい。
ここで、ポリイソシアナート化合物の例としては、トリレンジイソシアナート、ジフェニルメタンジイソシアナート、キシリレンジイソシアナート等の芳香族ポリイソシアナート、ヘキサメチレンジイソシアナート等の脂肪族ポリイソシアナート、イソホロンジイソシアナート、水素添加ジフェニルメタンジイソシアナート等の脂環式ポリイソシアナート等、及びそれらのビウレット体、イソシアヌレート体、さらにはエチレングリコール、プロピレングリコール、ネオペンチルグリコール、トリメチロールプロパン、ヒマシ油等の低分子活性水素含有化合物との反応物であるアダクト体等を挙げることができる。これらの架橋剤は1種を単独で用いてもよく、2種以上を組み合わせて用いてもよい。
汎用添加剤としては、例えば、粘着付与剤、酸化防止剤、軟化剤(可塑剤)、充填剤、防錆剤、顔料、染料、遅延剤、反応促進剤、紫外線吸収剤等が挙げられる。
これらの汎用添加剤を含有する場合、それぞれの汎用添加剤の含有量は、粘着剤の固形分100質量部に対して、好ましくは0.0001~60質量部、より好ましくは0.001~50質量部である。
連続空隙含有層は、前記微粒子と前記必要に応じて用いられる粘着剤とを含有する連続空隙含有層用コーティング液を塗布することにより形成される。
図1は、本発明の粘着シートにおける構成の一例を示す断面模式図であり、図1に示すように、本発明の粘着シート10は、表面に金属層2を有する支持基材1の該金属層2面上に、粘着剤層(X)3、前述した連続空隙含有層4、粘着剤層(Y)5及び剥離シート6が順に積層された構造を有している。
本発明の粘着シートにおける当該粘着剤層(X)及び粘着剤層(Y)の厚みは、好ましくは5~50μm、より好ましくは7~35μm、更に好ましくは10~30μmである。
前記粘着剤層(X)と連続空隙含有層の厚みの比[粘着剤層(X)/連続空隙含有層]は、優れた外観と、耐ブリスター性を両立させる観点から、好ましくは0.05~10、より好ましくは0.1~5、更に好ましくは0.2~2、より更に好ましくは0.3~0.8である。
また、前記粘着剤層(Y)と連続空隙含有層の厚みの比[粘着剤層(Y)/連続空隙含有層]は、優れた外観と、耐ブリスター性を両立させる観点から、好ましくは0.05~10、より好ましくは0.1~5、更に好ましくは0.2~2、より更に好ましくは0.3~0.8である。
この2つの粘着剤層(X)及び粘着剤層(Y)は同一組成のものであってもよいし、異なる組成のものであってもよい。粘着剤層の組成は特に限定されないが、前述の連続空隙含有層で用いたものと同じ粘着剤を用いてもよい。
[粘着シートの製造方法I]
本発明の粘着シートの製造方法は、支持基材、粘着剤層(X)、連続空隙含有層、粘着剤層(Y)が、この順に積層された粘着シートの製造方法であって、粘着剤層(X)、連続空隙含有層、粘着剤層(Y)の少なくとも2層以上が、多層コーターで同時塗布されることを特徴とする。
同時塗布される層は、製造性の観点から、粘着剤層(X)、連続空隙含有層、粘着剤層(Y)の少なくとも2層以上であり、粘着剤層(X)、連続空隙含有層、粘着剤層(Y)の3層を同時塗布することが好ましい。
前記同時塗布は、支持基材上に直接塗布してもよく、後述する粘着剤層を保護するための剥離シートの剥離処理面に塗布してもよい。
当該製造方法Iにおいて、多層コーターで同時塗布する際に用いるコーターとしては、例えばカーテンコーター、ダイコーター等が挙げられるが、これらの中で操作性の面から、ダイコーターが好適である。
本発明の粘着シートの製造方法IIは、支持基材、粘着剤層(X)、連続空隙含有層、粘着剤層(Y)が、この順に積層された粘着シートの製造方法であって、粘着剤層(X)、連続空隙含有層、粘着剤層(Y)の各々が、貼合により積層されることを特徴とする。
当該製造方法IIにおいて、貼合により積層する方法としては、例えば剥離シートの剥離処理面に、所定の粘着剤を乾燥後の厚みが、好ましくは5~50μm、より好ましくは7~35μm、より更に好ましくは10~30μmになるように、従来公知の方法で塗布、乾燥処理して剥離シート付き粘着剤シートを作製し、次いでこのものを連続空隙含有層とラミネートロールを用いて貼り合わせる方法を用いることができる。
当該製造方法IIにおいて、各々の層を形成、塗布する際に用いるコーターとしては、例えばエアーナイフコーター、ブレードコーター、バーコーター、グラビアコーター、ロールコーター、ロールナイフコーター、カーテンコーター、ダイコーター、ナイフコーター、スクリーンコーター、マイヤーバーコーター、キスコーター等が挙げられるが、これらの中で操作性の面から、ロールナイフコーター、ダイコーターが好適である。各々の層を形成、塗布したのち、これらの層を乾燥する工程を行なう。乾燥温度としては、35~200℃が好ましい。
なお、wet-on-wetプロセスとは、例えば粘着剤層(X)形成用コーティング液を塗布し、乾燥処理することなしに、さらにその上に連続空隙含有層形成用コーティング液を塗布する方法である。
一方、wet-on-dryプロセスとは、例えば粘着剤層(X)形成用コーティング液を塗布し、その上に連続空隙含有層形成用コーティング液を塗布後、乾燥処理したのち、粘着剤層(Y)形成用コーティング液を塗布する方法である。
また、粘着剤層(X)、連続空隙含有層、粘着剤層(Y)の順で積層された基材レスの粘着シートを作製し、支持基材を後から積層する方法も用いることができる。この場合、基材レスの粘着シートは、粘着剤層の保護のために後述する剥離シートを設けていてもよい。
前述した粘着シートの作製方法において用いられる剥離シートとしては、例えばポリエチレンテレフタレート、ポリブチレンテレフタレート、ポリエチレン、ポリプロピレン、ポリアクリレート等の各種樹脂よりなるフィルムや、ポリエチレンラミネート紙、ポリプロピレンラミネート紙、クレーコート紙、樹脂コート紙、グラシン紙、上質紙等の各種紙材を基材とし、この基材の粘着剤層との接合面に、必要により剥離処理が施されたものを用いることができる。
剥離処理としては、シリコーン系樹脂、長鎖アルキル系樹脂、フッ素系樹脂等の剥離剤よりなる剥離剤層の形成が挙げられる。剥離シートの厚さに、特に制限はないが、通常20~200μm、好ましくは25~180μm、より好ましくは35~170μmである。
このようにして得られた本発明の粘着シートは、ポリカーボネート、ポリメチルメタクリレート、ポリスチレン、ABS樹脂等のプラスチック成形品に貼付され、ブリスターの発生を効果的に抑制することができる。
なお、各例で得られた粘着シートの耐ブリスター性は、以下に示す方法に従って求めた。
50mm×50mmの粘着シートを、剥離シートを剥がして、厚さ2mmの70mm×150mmのポリメチルメタクリレート板[三菱レイヨン社製、「アクリライトL001」]に、スキージーを用いて圧着し、23℃で12時間放置した後、80℃の熱風乾燥機中に1.5時間放置し、その後90℃の熱風乾燥機中に1.5時間放置して、加熱促進後のブリスターの発生状態を観察し、下記の判定基準で評価した。
A:目視でブリスターが全く確認されなかった。
B:目視で部分的にブリスターが確認された。
C:目視で全面にブリスターが確認された。
さらに、連続空隙含有層を形成する材料となる微粒子(ただしシリカを除く)のメジアン径はレーザー回折・散乱式粒度分布測定装置(堀場製作所社製、製品名「LA-920」)を用いて、レーザー散乱法による粒度分布の測定を行うことにより、求めた。
また、連続空隙含有層空隙による厚み増分率及び微粒子(ただしシリカを除く)の質量濃度は、それぞれ明細書本文記載の式(1)及び式(2)によって算出した。
<膜厚の測定>
膜厚は、空隙含有層の厚みを、JIS K 7130に準じて、定圧厚さ測定器(テクロック社製、製品名「PG-02」)で測定した。
<粘着剤層形成用コーティング液(A)の調製>
アクリル系樹脂溶液(ブチルアクリレート(以下、「BA」ともいう)及びアクリル酸(以下、「AA」ともいう)からなるアクリル系共重合体(BAとAAとの質量濃度比〔BA/AA〕=90/10(質量%))、重量平均分子量(Mw):47万、固形分濃度:33.6質量%、溶媒:トルエンと酢酸エチルとの混合溶媒)100質量部に対して、イソシアネート系架橋剤(商品名:「コロネートL」、固形分濃度:75質量%、日本ポリウレタン社製)を1質量部(アクリル系共重合体100質量部に対して、固形分2.23質量部)、酢酸エチルを添加し、粘着剤層形成用コーティング液(A)(固形分濃度:28質量%)を得た。
アクリル系樹脂溶液(BA及びAAからなるアクリル系共重合体(BAとAAとの質量濃度比〔BA/AA〕=90/10(質量%))、重量平均分子量(Mw):47万、固形分濃度:33.6質量%、溶媒:トルエンと酢酸エチルの混合溶媒)100質量部に対して、微粒子としてアルミナ粒子(商品名:「AKP-3000」、メジアン径:0.8μm、住友化学社製)80.15質量部、及びトルエンを添加し、アクリル系樹脂溶液にアルミナ粒子を分散させることにより、アルミナ分散粘着剤組成物(固形分濃度:37質量%)を調製した。さらにイソシアネート系架橋剤(商品名:「コロネートL」、固形分濃度:75質量%、日本ポリウレタン社製)を1質量部(アクリル系共重合体100質量部に対して、固形分2.23質量部)添加し、更にトルエンを添加して、固形分濃度22質量%の連続空隙含有層用コーティング液(B)を得た。
支持基材として、片面にアルミ蒸着層を設けたポリエチレンテレフタレートフィルム(リンテック社製、製品名「FNSケシN50」、厚み50μm)を、剥離シートとして、剥離フィルム[リンテック社製、製品名「SP-PET381130」、厚み38μm]を用いた。この剥離シートの剥離処理面に、粘着剤層形成用コーティング液(A)を乾燥後の厚さが10μmとなるようにロールコーターで塗布し、100℃で2分間乾燥した後、ラミネートロールを用いて、前記支持基材のアルミ蒸着面と貼り合わせて粘着シート(I)を作製した。次いで前記とは別に用意した剥離シートの剥離処理面に、連続空隙含有層用コーティング液(B)を乾燥後の厚さが20μmとなるようにロールコーターで塗布し、100℃で2分間乾燥した後、ラミネートロールを用いて、前記粘着シート(I)の粘着剤層形成用コーティング液(A)の乾燥膜側の面と貼り合わせて粘着シート(II)を作製した。さらに前記とは別に用意した剥離シートの剥離処理面に、粘着剤層形成用コーティング液(A)を乾燥後の厚さが10μmとなるようにロールコーターで塗布し、100℃で2分間乾燥した後、ラミネートロールを用いて、前記粘着シート(II)の連続空隙含有層用コーティング液(B)の乾燥膜側の面と貼り合わせて実施例1の粘着シートを作製した。
連続空隙含有層中のアルミナ粒子の質量濃度は70%であり、空隙による厚み増分率は、123%であった。
実施例1において、微粒子の種類、微粒子の質量部及び微粒子質量濃度を表1に記載するものに変更した以外は、実施例1と同様にして、粘着シートを作製した。
なお、微粒子は、下記に示すアルミナ、ベーマイト、及びスメクタイトを使用した。
アルミナ:住友化学社製、製品名「AKP-3000」、メジアン径:0.8μm
ベーマイト:サソール社製、製品名「DISPERAL 60」、メジアン径:6.1μm
スメクタイト:コープケミカル社製、製品名「ルーセンタイトSTN」、メジアン径:53.7μm
実施例9
実施例8において、剥離シートの剥離処理面に、粘着剤層、連続空隙含有層、粘着剤層の順になるように、粘着剤層形成用コーティング液(A)と連続空隙含有層用コーティング液(B)を用いて多層ダイコーターで三層同時に塗布したこと以外は、実施例8と同様にして、粘着シートを作製した。
剥離シート「SP-PET381130」(前出)の剥離処理面に、粘着剤層用コーティング液(A)をロールコーターで塗布し、100℃で1分間乾燥することにより、厚さ40μmの粘着剤層を形成し、ラミネートロールを用いて、支持基材「FNSケシN50」(前出)のアルミ蒸着面と貼り合わせて粘着シートを作製した。
この粘着シートの粘着剤層中の微粒子質量濃度は0%であった。
また、図3に比較例3(ベーマイト粒子の質量濃度40%)で形成した層の断面の電子顕微鏡画像を示す。
実施例4では連続空隙が形成されているのに対して、比較例3(ベーマイト粒子の質量濃度40%)では、連続空隙は形成されていない。
なお、観察には、日立製作所製電界放出走査電子顕微鏡「S-4700」を用い、加速電圧は15kVで実施した。
2 金属層
3 粘着剤層(X)
4 連続空隙含有層
5 粘着剤層(Y)
6 剥離シート
10 粘着シート
Claims (5)
- 支持基材、粘着剤層(X)、微粒子(ただしシリカを除く)を含有する組成物よりなる連続空隙含有層、及び粘着剤層(Y)がこの順に積層された粘着シートであって、前記連続空隙含有層中の微粒子の質量濃度が45~100%である粘着シート。
- 連続空隙含有層の空隙による厚み増分率が、110~200%である、請求項1に記載の粘着シート。
- 前記微粒子が、酸化金属及びスメクタイトから選ばれる1種以上である、請求項1又は2に記載の粘着シート。
- 支持基材、粘着剤層(X)、連続空隙含有層、粘着剤層(Y)が、この順に積層された粘着シートの製造方法であって、粘着剤層(X)、連続空隙含有層、粘着剤層(Y)の少なくとも2層以上が、多層コーターで同時塗布される、請求項1~3のいずれかに記載の粘着シートの製造方法。
- 支持基材、粘着剤層(X)、連続空隙含有層、粘着剤層(Y)が、この順に積層された粘着シートの製造方法であって、粘着剤層(X)、連続空隙含有層、粘着剤層(Y)の各々が、貼合により積層される、請求項1~3のいずれかに記載の粘着シートの製造方法。
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