WO2010001835A1 - 塗料および該塗料を塗布した容器 - Google Patents
塗料および該塗料を塗布した容器 Download PDFInfo
- Publication number
- WO2010001835A1 WO2010001835A1 PCT/JP2009/061756 JP2009061756W WO2010001835A1 WO 2010001835 A1 WO2010001835 A1 WO 2010001835A1 JP 2009061756 W JP2009061756 W JP 2009061756W WO 2010001835 A1 WO2010001835 A1 WO 2010001835A1
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- Prior art keywords
- paint
- aqueous dispersion
- dispersoid
- container
- acid
- Prior art date
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B65D35/00—Pliable tubular containers adapted to be permanently or temporarily deformed to expel contents, e.g. collapsible tubes for toothpaste or other plastic or semi-liquid material; Holders therefor
- B65D35/14—Pliable tubular containers adapted to be permanently or temporarily deformed to expel contents, e.g. collapsible tubes for toothpaste or other plastic or semi-liquid material; Holders therefor with linings or inserts
- B65D35/16—Pliable tubular containers adapted to be permanently or temporarily deformed to expel contents, e.g. collapsible tubes for toothpaste or other plastic or semi-liquid material; Holders therefor with linings or inserts for minimising or preventing corrosion of body
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- C—CHEMISTRY; METALLURGY
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- C09D123/00—Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Coating compositions based on derivatives of such polymers
- C09D123/02—Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
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- C—CHEMISTRY; METALLURGY
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- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L51/00—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
- C08L51/06—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
- Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
- Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]
- Y10T428/1355—Elemental metal containing [e.g., substrate, foil, film, coating, etc.]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
- Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]
- Y10T428/139—Open-ended, self-supporting conduit, cylinder, or tube-type article
- Y10T428/1393—Multilayer [continuous layer]
Definitions
- the present invention relates to a paint and a container coated with the paint.
- a container having a resin layer on the inner surface of a container has been used as a container for storing various inclusions such as cosmetics, medicines, and foods.
- the said resin layer is for protecting a container from the inclusion contained.
- a paint made of a resin dispersed in an aqueous medium hereinafter also referred to as “aqueous dispersion”.
- aqueous dispersion there is a paint composed of an aqueous dispersion of polyolefin such as polyethylene, and a resin layer formed from the paint is excellent in properties such as flexibility and chemical resistance.
- Patent Document 1 describes a tube container in which a polyethylene coating layer is provided by spray coating an aqueous dispersion of polyethylene on the innermost layer of an aluminum tube.
- a surfactant in order to disperse the hydrophobic polyethylene in water.
- the surfactant remains in the resin layer even after heat drying because of low volatility.
- the surfactant remaining in the resin layer elutes from the resin layer to the inclusions over time, and adversely affects the inclusions.
- aqueous dispersion paints of polyethylene having a high viscosity have a problem in paintability (handling), for example, when they are applied by a spray method, the paint spray nozzles are easily clogged.
- the resin layer formed of polyethylene has low adhesion strength with a container made of aluminum or the like, and the resin layer may be peeled off and the container may be corroded by inclusions.
- Patent Document 2 describes using a dry film of a polyolefin resin dispersed aqueous solution as a base film for coating or the like. Further, it is disclosed that an ionomer resin is suitable as the polyolefin resin in order to improve adhesion to a metal. However, a resin layer formed from an ionomer resin is generally inferior in chemical resistance and heat resistance and has a problem of being easily corroded.
- the resin layer formed from an epoxy compound is provided on the inner surface of a commercially available aluminum tube, the epoxy compound contains a harmful substance such as bisphenol A which is one of environmental hormones. When the harmful substance is eluted from the resin layer, the inclusion is adversely affected.
- An object of the present invention is to provide a paint excellent in properties such as chemical resistance and heat resistance, free from harmful substances such as VOC (volatile organic compounds) and environmental hormones, and having excellent paintability. is there. Moreover, it is providing the container excellent in the characteristic which apply
- the inventor of the present invention contains two kinds of aqueous dispersions having different average particle diameters of dispersoids at a specific ratio, thereby providing chemical resistance and heat resistance.
- the present inventors have found that a paint having excellent properties such as the above and excellent paintability on the inner surface of the container can be obtained, and the present invention has been completed.
- the coating material of the present invention contains the first aqueous dispersion (A) and the second aqueous dispersion (B), and the average particle size of the dispersoid of the aqueous dispersion (A) is 1 to 20 ⁇ m.
- the average particle size of the dispersoid of the aqueous dispersion (B) is 1/100 to 1/5 of the average particle size of the dispersoid of the aqueous dispersion (A), and the aqueous dispersion (A ) And the aqueous dispersion (B) in a mass ratio (aqueous dispersion (A) / aqueous dispersion (B)) of 2/1 to 100/1.
- the dispersoid of the aqueous dispersion (A) is a particle formed from a polyolefin and an acid-modified polyolefin, and the dispersoid of the aqueous dispersion (B) is preferably an acid-modified polyolefin particle.
- the dispersion medium of the aqueous dispersion (A) or (B) is preferably at least one selected from the group consisting of water and alcohols having 1 to 4 carbon atoms.
- the paint of the present invention preferably further contains 1 to 20% by mass of a solvent. More preferably, the solvent is a water-soluble organic compound having a boiling point in the range of 100 to 200 ° C.
- the coating material of this invention does not contain surfactant substantially.
- the paint of the present invention preferably has a viscosity of 80 to 400 seconds as measured by Flow Cup No. 3 according to JIS K5600-2-2.
- the container of the present invention is characterized in that a layer (X) obtained by applying the above-mentioned paint is formed on the inner surface of the container.
- the container is preferably made of metal, and more preferably made of aluminum.
- the container is preferably a tube, and the mouth of the tube is particularly preferably a closed membrane.
- the thickness of the layer (X) is preferably 2 to 50 ⁇ m, and the layer (X) is suitably formed by a coating method using a spray gun.
- the paint of the present invention it is possible to stably and satisfactorily paint by various conventional painting methods.
- it is possible to perform extremely good painting for example, the clogging of the paint spray nozzle can be suppressed.
- the coating material of the present invention it is possible to form a uniform resin layer with less generation of pinholes or bubbles, and to form a resin layer having excellent adhesion to the inner surface of the container.
- the container which has the resin layer excellent in characteristics, such as chemical resistance and heat resistance, on the container inner surface can be obtained.
- the resin layer can suppress corrosion of the container due to inclusions such as drugs, cosmetics, foods, hairdressing agents, hair dyes, and adhesives.
- the container having the resin layer is suitable as a container for storing and storing the inclusion.
- the paint of the present invention contains the first aqueous dispersion (A) and the second aqueous dispersion (B).
- the average particle size of the dispersoid of the aqueous dispersion (A) is 1 to 20 ⁇ m, preferably 1 to 15 ⁇ m, more preferably 1 to 10 ⁇ m.
- the average particle size of the dispersoid of the aqueous dispersion (B) is 1/100 to 1/5, preferably 1/80 to 1/20 of the average particle size of the dispersoid of the aqueous dispersion (A). More preferably, it is 1/60 to 1/40.
- the average particle size of the dispersoid of the aqueous dispersion (B) is not particularly limited as long as the average particle size satisfies the above conditions, but is preferably 0.01 to 0.9 ⁇ m, for example, 0.05 It is more preferably from 0.5 to 0.5 ⁇ m, particularly preferably from 0.08 to 0.1 ⁇ m.
- an organic solvent or a thickener having a low density is used in addition to the dispersion medium.
- an organic solvent or a thickener having a low density is used in addition to the dispersion medium.
- an organic solvent or a thickener having a low density is used in addition to the dispersion medium.
- an organic solvent or a thickener having a low density is used in addition to the dispersion medium.
- the average particle size of the dispersoid of the aqueous dispersion (A) is smaller than 1 ⁇ m
- the average particle size of the dispersoid of the aqueous dispersion (B) is set to a small range such as less than 0.01 ⁇ m. Must. It is technically difficult to obtain a dispersoid having such a small average particle size.
- the mass ratio of the dispersoid of the aqueous dispersion (A) to the dispersoid of the aqueous dispersion (B) is 2/1 to 100/1. Yes, preferably 10/1 to 60/1, more preferably 20/1 to 40/1.
- the viscosity, surface tension, and other characteristics of the paint can be set within an appropriate range according to various coating methods, and the paintability of the paint is improved.
- there is no liquid repellency during coating and there is little generation of pinholes or bubbles, and a uniform resin layer can be formed.
- a coating method using a spray gun clogging and dripping of the paint spray nozzle are suppressed, and the paintability is extremely good.
- a good resin layer can be formed even in the closed membrane portion of the mouth where painting is difficult.
- Dispersoids with a small average particle size intercalate between dispersoids with a large average particle size and act like a lubricant, so the properties of paint viscosity, surface tension, etc. can be dramatically modified, and various coating methods It is estimated that the paintability can be improved.
- dispersoid having a small average particle diameter enters between the dispersoids having a large average particle diameter and fills the voids between the particles, there is little occurrence of pinholes or bubbles, and a uniform resin layer can be formed. Estimate that you can.
- the dispersoid of the aqueous dispersion (A) is preferably particles (hereinafter also referred to as “polyolefin mixed particles”) formed from a polyolefin and an acid-modified polyolefin.
- the polyolefin mixed particles can be produced by a known method. For example, there may be mentioned a method in which polyolefin and acid-modified polyolefin are produced separately and then both are mixed.
- the polyolefin or acid-modified polyolefin in powder or pellet form is previously mixed using a mixer such as a Henschel mixer to prepare a mixture, and then the mixture is heated and melted, or the polyolefin And acid-modified polyolefin may be directly charged into a drum, an extruder or the like and mixed while heating and melting.
- a mixer such as a Henschel mixer to prepare a mixture
- the mixture is heated and melted
- the polyolefin And acid-modified polyolefin may be directly charged into a drum, an extruder or the like and mixed while heating and melting.
- the dispersoid of the aqueous dispersion (A) is a particle formed from a polyolefin and an acid-modified polyolefin
- the main component of the dispersion medium is water
- the dispersion is stable without adding a surfactant.
- An aqueous dispersion can be formed. Therefore, since no harmful substances derived from the surfactant are present in the resin layer formed from the paint containing the aqueous dispersion (A), there is no adverse effect due to the elution of the harmful substances.
- the polyolefin is not particularly limited as long as it is within the object of the present invention, and examples thereof include homopolymers of ⁇ -olefins and copolymers of two or more ⁇ -olefins.
- ⁇ -olefin examples include ethylene, propylene, butene-1, pentene-1, 2-methylbutene-1, 3-methylbutene-1, hexene-1, 3-methylpentene-1, 4-methylpentene- 1,3,3-dimethylbutene-1, heptene-1, methylhexene-1, dimethylpentene-1, trimethylbutene-1, ethylpentene-1, octene-1, methylpentene-1, dimethylhexene-1, trimethyl Pentene-1, ethylhexene-1, methylethylpentene-1, diethylbutene-1, propylpentene-1, decene-1, methylnonene-1, dimethyloctene-1, trimethylheptene-1, ethyloctene-1, methyl Ethyl heptene-1, diethylhexene-1, dodecene-1, hexa
- ⁇ -olefin homopolymer or the copolymer of two or more ⁇ -olefins include polyethylene, polypropylene, poly-1-butene, poly-4-methyl-1-pentene, ethylene- Examples thereof include a propylene copolymer, an ethylene-1-butene copolymer, and a propylene-1-butene copolymer.
- polyethylene and polypropylene are more preferable, and polyethylene is particularly preferable.
- the polyolefin may be composed of one or a combination of two or more of the above polymers.
- the molecular weight of the polyolefin is preferably in the range of 0.05 to 5 dl / g in terms of intrinsic viscosity [ ⁇ ].
- [ ⁇ ] exceeds 5 dl / g, the viscosity of the polyolefin mixed particles obtained becomes high and dispersion becomes difficult.
- it is less than 0.05 dl / g, the mechanical strength of the polyolefin decreases, and the viscosity of the resulting polyolefin mixed particles becomes too low, so that it is difficult to be sheared during dispersion. It becomes difficult to obtain.
- the resin layer formed from the coating material containing the polyolefin is excellent in properties such as chemical resistance and flexibility.
- the acid-modified polyolefin is not particularly limited as long as it is within the scope of the present invention, but is a copolymer of the ⁇ -olefin and an unsaturated carboxylic acid or an anhydride thereof, an olefin polymer with an unsaturated carboxylic acid. Or what grafted the anhydride can be used.
- unsaturated carboxylic acid and anhydride thereof constituting the acid-modified polyolefin monocarboxylic acid, dicarboxylic acid and anhydride thereof are usually used.
- Specific examples of the unsaturated carboxylic acid and its anhydride include acrylic acid, methacrylic acid, crotonic acid, isocrotonic acid, ⁇ -ethylacrylic acid, maleic acid, fumaric acid, itaconic acid, citraconic acid, tetrahydrophthalic acid, methyltetrahydro Phthalic acid, endocis-bicyclo [2.2.1] hept-5-ene-2,3-dicarboxylic acid (trade name: nadic acid), methyl-endocis-bicyclo [2.2.1] hept-5-ene And ⁇ , ⁇ -unsaturated carboxylic acids such as -2,3-dicarboxylic acid and anhydrides thereof.
- the molecular weight of the acid-modified polyolefin is an intrinsic viscosity [ ⁇ ] and is usually 0.05 to 3 dl / g, preferably 0.06 to 0.8 dl / g.
- the intrinsic viscosity [ ⁇ ] (unit: dl / g) is measured with a decalin solution at 135 ° C.
- the acid value of the acid-modified polyolefin is 40 to 150, and preferably 50 to 130. If the acid value is too low, the emulsifiability of the polyolefin mixed particles decreases, and the average particle size of the dispersoid in the resulting aqueous dispersion increases. If the acid value is too high, the hydrophilicity becomes too high and the water resistance is lowered.
- the acid value is the number of mg of potassium hydroxide required for neutralization per gram of acid-modified polyolefin.
- a known method can be used and is not particularly limited.
- a method in which an unsaturated carboxylic acid is grafted to the polyolefin by a method in which the polyolefin is dissolved in a solvent and then reacted by heating and stirring in the presence of an organic peroxide can be used.
- organic peroxide examples include benzoyl peroxide, lauroyl peroxide, azobisisobutyronitrile, dicumyl peroxide, ⁇ , ⁇ '-bis (t-butylperoxydiisopropyl) benzene, 2,5- Dimethyl-2,5-di (t-butylperoxy) hexane, 2,5-dimethyl-2,5-di (t-butylperoxy) hexyne-3, di-t-butyl peroxide, cumene hydroperoxide , T-butyl hydroperoxide and the like.
- the addition amount of the organic peroxide is not particularly limited, but is usually 0.005 to 5 parts by mass, preferably 0.01 to 1 part by mass with respect to 100 parts by mass of the polyolefin.
- the acid-modified polyolefin grafted with unsaturated carboxylic acids is a mixture of the above-mentioned polyolefin, unsaturated carboxylic acids and organic peroxide with a tumbler, Henschel mixer, etc. It can be obtained by melt-kneading at a temperature of 280 ° C. or less to carry out the grafting reaction.
- the method for melt-kneading is not particularly limited, and can be performed using, for example, a screw extruder, a Banbury mixer, a mixing roll, or the like, but a screw extruder is preferably used for ease of operation.
- the temperature and time for melt kneading vary depending on the decomposition temperature of the organic peroxide to be used. In general, the temperature is 160 to 280 ° C. for 0.3 to 30 minutes, preferably 170 to 250 ° C. for 1 to 10 minutes.
- acid-modified polyethylene and acid-modified polypropylene are more preferable, and acid-modified polyethylene is particularly preferable.
- acid-modified polyethylene is particularly preferable.
- a resin layer formed from a paint containing the acid-modified polyolefin is excellent in properties such as chemical resistance, adhesion, and flexibility.
- the content ratio of the polyolefin and the acid-modified polyolefin in the polyolefin mixed particles is 1 to 99 parts by mass, preferably 1 to 50 parts by mass with respect to 100 parts by mass of the polyolefin.
- the dispersoid of the aqueous dispersion (B) is preferably acid-modified polyolefin particles.
- the acid-modified polyolefin constituting the dispersoid of the aqueous dispersion (B) is not particularly limited as long as it is within the object of the present invention.
- the dispersoid of the aqueous dispersion (A) described above is constituted.
- the acid-modified polyolefin are as follows. Among these, acid-modified polyethylene and acid-modified polypropylene are more preferable, and acid-modified polyethylene is particularly preferable.
- the resin layer formed from the paint containing the acid-modified polyolefin is excellent in properties such as chemical resistance, adhesion and flexibility.
- acid-modified polyethylene has a low melting point, it can be baked at a low temperature during coating.
- the dispersion medium of the aqueous dispersion (A) or (B) is preferably at least one selected from the group consisting of water and an alcohol having 1 to 4 carbon atoms, and includes water and 1 to 3 carbon atoms. More preferably, it is at least one selected from the group consisting of alcohols.
- the alcohol having 1 to 4 carbon atoms is not particularly limited as long as it is within the object of the present invention, and examples thereof include methanol, ethanol, isopropanol, ethylene glycol, butanol and the like.
- the dispersion medium of the aqueous dispersion (A) water, an alcohol having 1 to 4 carbon atoms, or a mixed solvent thereof is more preferable, and water, an alcohol having 1 to 3 carbon atoms, or a mixed solvent thereof is more preferable. Water is particularly preferred.
- the dispersion medium of the aqueous dispersion (B) is more preferably water, an alcohol having 1 to 4 carbon atoms, or a mixed solvent thereof, more preferably water, an alcohol having 1 to 3 carbon atoms, or a mixed solvent thereof.
- Water, isopropanol are particularly preferred.
- the solid content concentration of the aqueous dispersion (A) is preferably 1 to 60% by mass, more preferably 20 to 50% by mass, and particularly preferably 30 to 40% by mass. Further, the solid content concentration of the aqueous dispersion (B) is preferably 1 to 60% by mass, more preferably 3 to 55% by mass, and particularly preferably 10 to 45% by mass.
- the method for obtaining the aqueous dispersions (A) and (B) is not particularly limited, but each of the components described above, that is, a dispersoid such as polyolefin, acid-modified polyolefin, water, one having 1 to 4 carbon atoms.
- a method of heating and stirring a dispersion medium such as alcohol and, if necessary, a basic compound or the like in a sealable container can be employed, and this method is most preferable. According to this method, it is not necessary to add a surfactant.
- the basic compound is not particularly limited, and examples thereof include alkali metal or alkaline earth metal oxides, hydroxides or hydrides, ammonia or amine compounds.
- the amount of the basic compound added is preferably 0.5 to 3.0 times equivalent, more preferably 0.8 to 2.5 times equivalent to the carboxyl group in the acid-modified polyolefin, It is particularly preferably 0.9 to 2.0 times equivalent. When the amount is less than 0.5 times equivalent, the effect of adding a basic compound is not recognized. When the amount exceeds 3.0 times equivalent, the drying time during resin layer formation becomes longer or the stability of the aqueous dispersion deteriorates. There is.
- an apparatus widely known to those skilled in the art as a solid / liquid stirring apparatus or an emulsifier can be used, and an apparatus capable of pressurization of 0.1 MPa or more is preferably used.
- the stirring method and the rotation speed of stirring are not particularly limited, but may be stirring at a low speed such that the dispersoid becomes a floating state in the dispersion medium. Therefore, high-speed stirring (for example, 1,000 rpm or more) is not essential, and an aqueous dispersion can be produced with a simple apparatus.
- Raw materials such as a dispersoid such as polyolefin and acid-modified polyolefin, water, and a dispersion medium such as alcohol having 1 to 4 carbon atoms are charged into the above apparatus, and the mixture is preferably stirred and mixed at a temperature of 40 ° C. or lower.
- the temperature in the tank at 60 to 220 ° C., preferably 80 to 200 ° C., more preferably 100 to 190 ° C., particularly preferably 100 to 180 ° C., preferably until there are no coarse particles (for example, 5 to
- the dispersoid is sufficiently dispersed in the dispersion medium, and then cooled to 40 ° C.
- the temperature in the tank is less than 60 ° C., it is difficult to sufficiently disperse the dispersoid in the dispersion medium.
- the temperature in the tank exceeds 220 ° C, the molecular weight of the dispersoid may be reduced.
- Jet pulverization is a process in which an aqueous dispersion is ejected from pores such as nozzles and slits under high pressure, and particles of dispersoids or particles of dispersoids collide with a collision plate, etc. To further refine the particles of the dispersoid.
- Specific examples of the apparatus for that purpose include A.I. P. V. Examples thereof include a homogenizer manufactured by Gaulin, and a microfluidizer M-110E / H manufactured by Mizuho Kogyo.
- the average particle size of the dispersoids of the aqueous dispersions (A) and (B) can be adjusted by the method described above, it is technically difficult to obtain a dispersoid having an average particle size of less than 0.01 ⁇ m. It is.
- Examples of the method for adjusting the solid content concentration of the aqueous dispersion thus obtained include a method of distilling the dispersion medium or diluting with water so as to obtain a desired solid content concentration.
- the aqueous dispersion used in the present invention is obtained by dispersing or dissolving the dispersoid in a dispersion medium to prepare a uniform liquid.
- the uniform liquid state means that in the appearance, a part where the solid content concentration is locally different from other parts such as precipitation, phase separation or skinning is not found in the aqueous dispersion.
- the average particle size of the dispersoid of the aqueous dispersion (A) exceeds the upper limit, it is difficult to obtain a uniform aqueous liquid dispersion.
- the mixing method of the aqueous dispersions (A) and (B) may be a method using a general mixing apparatus.
- the mixing device include a mixer such as an impeller, a dissolver, a homogenizer, and a homomixer, or a disperser such as a paint shaker, a ball mill, a sand mill, an attractor, a roll mill, and a kneader.
- examples of the method for adjusting the solid content concentration after mixing include a method in which the dispersion medium is distilled off or diluted with water so that a desired solid content concentration and viscosity are obtained.
- the paint of the present invention preferably further contains 20% by mass or less of the solvent, more preferably 15% by mass or less, and particularly preferably 10% by mass or less.
- the lower limit of the content of the solvent is preferably 1% by mass.
- the solvent is preferably a water-soluble organic compound having a boiling point in the range of 100 to 200 ° C.
- Specific examples of the solvent include 1-butanol and isobutanol. Of these, 1-butanol is particularly preferred. When such a solvent is contained in the above-mentioned range in the paint, it is preferable in terms of prevention of nozzle clogging and control of the paint drying speed.
- a crosslinking agent, inorganic particles, etc. can be added to the paint of the present invention. Addition of these is preferable because the chemical resistance and heat resistance of the formed resin layer are improved. It is preferable to add a crosslinking agent, inorganic particles, and the like at the time of preparing the paint.
- crosslinking agent examples include organic peroxides, isocyanate compounds, and silane coupling agents.
- the addition amount of the crosslinking agent is preferably 0.01 to 80 parts by mass, more preferably 0.1 to 50 parts by mass, and more preferably 0.5 to 30 parts by mass with respect to 100 parts by mass of the dispersoid. Part.
- examples of the inorganic particles include silica and alumina.
- the addition amount of the inorganic particles is preferably 30 parts by mass or less, more preferably 20 parts by mass or less, and preferably 10 parts by mass or less with respect to 100 parts by mass of the dispersoid.
- the coating material of this invention can be colored by adding an organic pigment or an inorganic pigment.
- the amount of the pigment added is preferably 2 parts by mass or less, more preferably 1 part by mass or less, and preferably 0.5 parts by mass or less with respect to 100 parts by mass in total of the dispersoid.
- the coating material of the present invention may contain other aqueous dispersion in addition to the aqueous dispersion (A) or (B) as long as it is within the object of the present invention.
- the paint of the present invention may contain other additives within the scope of the object of the present invention.
- the coating material of the present invention preferably contains substantially no surfactant. “Substantially free of surfactant” means that the surfactant is not used in the production of the paint, and the resulting paint is consequently free of surfactant. Therefore, the surfactant is particularly desired to have a zero content in the coating material, but may be contained in a trace amount within a range not impairing the effects of the present invention. When a paint that does not substantially contain a surfactant is used, the surfactant does not remain in the resin layer formed from the paint, and harmful substances derived from the surfactant (for example, bisphenol A) There is no risk of adverse effects on inclusions.
- the surfactant for example, bisphenol A
- the paint of the present invention preferably has a viscosity measured by flow cup No. 3 according to JIS K5600-2-2 of 80 to 400 seconds, more preferably 90 to 200 seconds. More preferably, it is 90 to 170 seconds, and particularly preferably 120 to 150 seconds. It is preferable for the viscosity to be in the above-mentioned range because of excellent paintability. For example, when painting with a spray gun, clogging and dripping of the paint spray nozzle are suppressed, and the paintability becomes extremely good. Further, the frequency of cleaning the spray gun can be dramatically reduced, which is preferable from the viewpoint of economy and efficiency. In particular, when the inner surface of an aluminum tube whose mouth is a closed membrane is painted with a spray gun, a good resin layer can be formed even in the closed membrane portion of the mouth where painting is difficult.
- the paint of the present invention can be suitably used for forming a container inner surface protective layer.
- it can be suitably used to form an aluminum tube inner surface protective layer.
- the container of the present invention is characterized in that a layer (X) obtained by applying the above-mentioned paint is formed on the inner surface of the container. Since the layer (X) is formed from the above-mentioned paint, it is excellent in properties such as chemical resistance, crack resistance, and water vapor barrier properties.
- a container is suitable as a container for storing and storing medicines, cosmetics, foods, hairdressing agents, hair dyes, adhesives, and the like.
- the layer (X) formed on the inner surface of the container can suppress corrosion of the container due to these inclusions.
- the container is preferably made of metal, more preferably iron or light metal, and particularly preferably aluminum. These metal containers are preferable because they are particularly excellent in adhesion and followability between the layer (X) and the inner surface of the container.
- examples of the container include a tube and a can.
- a tube is more preferable.
- the body part can maintain the pressed shape. Therefore, it is difficult for outside air to enter the inside of the container during use, and alteration and deterioration of the inclusions are suppressed. Moreover, it is excellent in workability.
- the metal tube inner surface is covered with the layer (X), corrosion of the tube due to inclusions can be suppressed.
- a metal tube is preferable for accommodating and storing a paste-like inclusion, for example, a medicine, cosmetics, food, hairdressing agent, hair dye or adhesive, and is convenient for carrying.
- the mouth of the tube is a closed membrane. If the mouth is provided with a closing membrane, the inclusions can be prevented from being falsified.
- the layer (X) and the inner surface of the aluminum tube, particularly the close membrane portion of the mouth have excellent adhesion and followability. Can be opened well.
- the thickness of the layer (X) is preferably 2 to 50 ⁇ m, more preferably 5 to 40 ⁇ m, and particularly preferably 10 to 30 ⁇ m. When the thickness of the layer (X) is within the above range, it is preferable in terms of chemical resistance and stretchability. If the average particle size of the dispersoids of the aqueous dispersions (A) and (B) used in the coating material is within the above range, a uniform layer (X) having a thickness within the above range is preferably formed. Can do.
- the coating amount of the above-mentioned paint is appropriately selected depending on the application, but the coating amount after drying is preferably 4.6 to 36.8 g / m 2 , and preferably 9.2 to 27.6 g / m 2. More preferably, 13.8 to 23.0 g / m 2 is particularly preferable. If the film is formed so as to fall within the above range, a resin layer having excellent uniformity can be obtained.
- the layer (X) is particularly preferably formed by a coating method using a spray gun.
- FIG. 1 is a view showing an example of a method for forming the layer (X) using a spray gun.
- a method for forming the layer (X) will be described with reference to FIG.
- the layer (X) is formed by spraying the above-described paint from the tip of the spray gun and spraying the paint on the inner surface of the tube.
- a uniform layer can be formed by such a method.
- the formed layer (X) is dried and baked to obtain a tube having the inner surface coated with the above-mentioned paint.
- the drying temperature is not particularly limited, but is usually 100 to 200 ° C., preferably 130 to 180 ° C.
- the baking temperature is not particularly limited, but is usually 140 to 210 ° C., preferably 150 to 200 ° C.
- the drying time is not particularly limited, but is usually 5 to 15 minutes, preferably 7 to 10 minutes.
- the baking time is not particularly limited, but is usually 5 to 15 minutes, preferably 7 to 10 minutes.
- Arrow Base SD1200 (dispersoid: modified polyethylene particles, solid content concentration: 20% by mass, dispersion medium: water, isopropanol) manufactured by Unitika Ltd. was used as paint 2.
- Paint 1 (10 parts by mass) and Paint 2 (1 part by mass) were stirred and mixed with an impeller stirrer for 30 minutes to prepare Paint 3.
- the mass ratio of the dispersoid of the paint 1 and the dispersoid of the paint 2 was 20/1.
- Paint 1 (10 parts by mass) and Paint 2 (1 part by mass) were stirred and mixed with an impeller stirrer for 30 minutes, and 1-butanol was added to make 7% by mass of the total paint components, and 30 minutes Stirring was performed to prepare paint 4.
- the mass ratio of the dispersoid of the paint 1 and the dispersoid of the paint 2 was 20/1.
- Paint 1 (20 parts by mass) and Paint 2 (1 part by mass) were stirred and mixed with an impeller stirrer for 30 minutes, and 1-butanol was added so that the total amount of the paint was 5.75% by mass. Stirring was performed for a minute to prepare paint 5.
- the mass ratio of the dispersoid of paint 1 to the dispersoid of paint 2 was 40/1.
- Paint 1 (5 parts by mass) and Paint 2 (1 part by mass) are stirred and mixed for 30 minutes with an impeller stirrer, and 1-butanol is added to make 6% by mass of the whole paint, followed by stirring for 30 minutes.
- the paint 6 was prepared.
- the mass ratio of the dispersoid of paint 1 to the dispersoid of paint 2 was 10/1.
- the paint 7 was manufactured by Sumitomo Seika Co., Ltd., trade name: Syxen (dispersoid; ethylene-ammonium acrylate copolymer, solid content concentration: 24 mass%, dispersion medium: water).
- Paint 2 The average particle size of the dispersoid of paint 2 was measured in the same manner as paint 1. The average particle size was 0.12 ⁇ m.
- Paint 7 The average particle size of the dispersoid of paint 7 was measured in the same manner as paint 1. The average particle size was 0.10 ⁇ m.
- Example 1 to 4 Comparative Examples 1 to 3
- the prepared paint 3, paint 4, paint 5 and paint 6 are sequentially set as Example 1, Example 2, Example 3 and Example 4, and the prepared paint 1, paint 2 and paint 7 are sequentially compared as comparative examples.
- Comparative Example 1 Comparative Example 2 and Comparative Example 3, each paint was evaluated as follows.
- the coating materials 1 to 7 were each applied with a bar coater No. 24 on the surface (inner surface of the tube) of the base material which was formed by cutting an aluminum tube. Next, it was dried at 180 ° C. for 10 minutes to form a resin layer (thickness of the resin layer: about 20 ⁇ m) on the substrate (six sheets were prepared for each paint). On the entire surface of the resin layer after drying, a reagent having the following composition assuming an ointment as an example of an inclusion was applied to obtain a laminate in which a resin layer and a reagent layer were sequentially formed on the substrate.
- composition of chemical test reagent 86% white petrolatum Liquid paraffin 5% Dissolving agent 5% Surfactant 4% The two laminates were superposed so that the reagent application surface was on the inside. This was stored in a constant temperature bath at 40 ° C. for 3 months, and then the state of the resin layer was visually confirmed. At the time of confirmation, the reagent was wiped off so as not to damage the resin layer surface. The results are shown in Table 2.
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- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
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- Paints Or Removers (AREA)
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Abstract
Description
また、本発明の塗料は、さらに溶媒を1~20質量%含有することが好ましい。前記溶媒は沸点が100~200℃の範囲内にある水溶性有機化合物であることがより好ましい。
また、本発明の塗料は、JIS K5600-2-2に準じてフローカップNo.3により測定された粘度が80~400秒であることが好ましい。
前記水性分散体(A)の分散質の平均粒子径は、1~20μmであり、好ましくは1~15μmであり、より好ましくは1~10μmである。
前記水性分散体(A)の分散質は、ポリオレフィンと酸変性ポリオレフィンとから形成される粒子(以下「ポリオレフィン混合粒子」とも記す。)であることが好ましい。ポリオレフィン混合粒子は公知の方法で製造することができる。例えば、ポリオレフィンと酸変性ポリオレフィンとを別々に製造しておき、その後に両者を混合して得る方法などが挙げられる。具体的には、予め、粉体またはペレット状の前記ポリオレフィンと酸変性ポリオレフィンとをヘンシェルミキサー等の混合機を用いて混合して混合物を調製した後、この混合物を加熱溶融する方法、あるいは前記ポリオレフィンと酸変性ポリオレフィンとを、直接、ドラム、押出機等に投入し、加熱溶融しながら混合する方法が挙げられる。
前記ポリオレフィンは、上記重合体の1種または2種以上の組合せからなっていてもよい。
前記酸変性ポリオレフィンとしては、本発明の目的の範囲内であれば特に限定されないが、前記α-オレフィンと不飽和カルボン酸またはその無水物との共重合体、オレフィン系重合体に不飽和カルボン酸またはその無水物をグラフトさせたものを用いることができる。
このような酸変性ポリオレフィンを用いると、該酸変性ポリオレフィンを含有する塗料から形成される樹脂層は耐薬品性、密着性、柔軟性等の特性に優れる。
前記水性分散体(A)の固形分濃度は、1~60質量%であることが好ましく、20~50質量%であることがより好ましく、30~40質量%であることが特に好ましい。また、前記水性分散体(B)の固形分濃度は、1~60質量%であることが好ましく、3~55質量%であることがより好ましく、10~45質量%であることが特に好ましい。
前記水性分散体(A)および(B)を得るための方法は、特に限定されないが、既述の各成分、すなわち、ポリオレフィン、酸変性ポリオレフィン等の分散質、水、炭素原子数1~4のアルコール等の分散媒、必要に応じて塩基性化合物等を、密閉可能な容器中で加熱、攪拌する方法を採用することができ、この方法が最も好ましい。この方法によれば、界面活性剤を特に添加する必要がない。また、前記塩基性化合物を添加することによって、酸変性ポリオレフィン中のカルボキシル基は、その一部または全部が中和され、生成したカルボキシルアニオン間の電気反発力によって微粒子間の凝集が防がれ、水性分散体に安定性が付与される。前記塩基性化合物としては、特に限定されず、アルカリ金属またはアルカリ土類金属の酸化物、水酸化物もしくは水素化物、アンモニアまたはアミンの化合物等を挙げることができる。前記塩基性化合物の添加量は、酸変性ポリオレフィン中のカルボキシル基に対して0.5~3.0倍当量であることが好ましく、0.8~2.5倍当量であることがより好ましく、0.9~2.0倍当量であることが特に好ましい。0.5倍当量未満では、塩基性化合物の添加効果が認められず、3.0倍当量を超えると、樹脂層形成時の乾燥時間が長くなったり、水性分散体の安定性が悪化する場合がある。
上記の装置にポリオレフィン、酸変性ポリオレフィン等の分散質、水、炭素原子数1~4のアルコール等の分散媒などの原料を投入し、好ましくは40℃以下の温度で攪拌混合しておく。次いで、槽内の温度を60~220℃、好ましくは80~200℃、さらに好ましくは100~190℃、特に好ましくは100~180℃に保ちつつ、好ましくは粗大粒子が無くなるまで(例えば、5~120分間)攪拌を続けることにより、分散質を分散媒中に充分に分散させ、その後、好ましくは攪拌下で40℃以下に冷却することにより、水性分散体を得ることができる。槽内の温度が60℃未満の場合は、分散質を分散媒中に充分に分散させることが困難になる。槽内の温度が220℃を超える場合は、分散質の分子量が低下するおそれがある。
本発明の塗料は、さらに溶媒を20質量%以下含有することが好ましく、15質量%以下含有することがより好ましく、10質量%以下含有することが特に好ましい。前記溶媒の含有量の下限は1質量%であることが好ましい。前記溶媒としては、沸点が100~200℃の範囲内にある水溶性有機化合物であることが好ましい。前記溶媒の具体例としては、1-ブタノール、イソブタノールなどが挙げられる。中でも1-ブタノールが特に好ましい。このような溶媒を塗料中に前記範囲で含有していると、ノズルの詰まり防止、塗料の乾燥速度制御の点で好ましい。
前記顔料の添加量は、分散質の合計100質量部に対して2質量部以下であることが好ましく、1質量部以下であることがより好ましく、0.5質量部以下であることが好ましい。
本発明の塗料には、本発明の目的の範囲内であれば、他の添加剤を含んでいてもよい。
本発明の容器は、容器内面に、上述した塗料を塗布して得られる層(X)が形成されていることを特徴としている。前記層(X)は上述した塗料から形成されるため、耐薬品性、耐クラック性、水蒸気バリア性等の特性に優れる。このような容器は、例えば、薬品、化粧品、食品、整髪剤、染毛剤または接着剤などを収容保存する容器として好適である。容器内面に形成される前記層(X)は、これらの内包物による容器の腐食を抑制することができる。
<塗料の調製>
(塗料1)
三井化学(株)製のケミパールM200(分散質:ポリエチレンと酸変性ポリオレフィンから形成された粒子、固形分濃度:40質量%、分散媒:水)を塗料1とした。
ユニチカ(株)製のアローベースSD1200(分散質;変性ポリエチレン粒子、固形分濃度:20質量%、分散媒;水、イソプロパノール)を塗料2とした。
塗料1(10質量部)と、塗料2(1質量部)とをインペラー攪拌機により、30分間攪拌・混合し、塗料3を調製した。なお、塗料1の分散質と塗料2の分散質との質量比(塗料1/塗料2)は、20/1であった。
塗料1(10質量部)と、塗料2(1質量部)とをインペラー攪拌機により、30分間攪拌・混合し、さらに1-ブタノールを塗料成分全体の7質量%となるように添加し、30分間攪拌を行い、塗料4を調製した。なお、塗料1の分散質と塗料2の分散質との質量比(塗料1/塗料2)は、20/1であった。
塗料1(20質量部)と、塗料2(1質量部)とをインペラー攪拌機により、30分間攪拌・混合し、さらに1-ブタノールを塗料全体の5.75質量%となるように添加し、30分間攪拌を行い、塗料5を調製した。なお、塗料1の分散質を塗料2の分散質との質量比(塗料1/塗料2)は、40/1であった。
塗料1(5質量部)と、塗料2(1質量部)とをインペラー攪拌機により、30分間攪拌・混合し、さらに1-ブタノールを塗料全体の6質量%となるように添加し、30分間攪拌を行い、塗料6を調製した。なお、塗料1の分散質を塗料2の分散質との質量比(塗料1/塗料2)は、10/1であった。
住友精化(株)製、商品名:ザイクセン(分散質;エチレン-アクリル酸アンモニウム塩共重合体、固形分濃度:24質量%、分散媒;水)を塗料7とした。
・塗料1
株式会社 堀場製作所製レーザ回折/散乱式粒度分布測定装置 LA-920を用いて、塗料1の分散質の平均粒子径を測定した。当該平均粒子径は、4.12μmであった。
塗料1と同様に塗料2の分散質の平均粒子径を測定した。当該平均粒子径は、0.12μmであった。
塗料1と同様に塗料7の分散質の平均粒子径を測定した。当該平均粒子径は、0.10μmであった。
上記調製した塗料3、塗料4、塗料5および塗料6を、順に実施例1、実施例2、実施例3および実施例4とし、上記調製した塗料1、塗料2および塗料7を、順に比較例1、比較例2および比較例3として、各塗料について以下のとおり評価した。
塗料1~7の粘度を以下のとおり測定した。
JIS K5600-2-2に記載のフローカップNo.3を用いて、JIS5600-2-2に記載の測定条件に従って各塗料の粘度を測定した。測定結果を表1に示す。
インパクトプレスによって成形されたアルミニウム製チューブの内面に、流体式自動スプレーガンで、塗料1~7をそれぞれ噴霧し、塗布した。次に200℃に設定した乾燥炉で、アルミニウム製チューブの内面に塗布された塗料の乾燥および焼付けを行って容器を製造した。
(1)耐薬品性
上記塗料1~7により形成された樹脂層について、耐薬品性試験を以下のとおり実施した。
アルミニウム製チューブを切り開いて平板状にした基材の表面(チューブ内面)上に、上記塗料1~7を、それぞれバーコーターNo.24で塗布した。次に180℃で10分間乾燥して、基材上に樹脂層(樹脂層の厚さ:約20μm)を形成した(各塗料につき6枚準備した)。乾燥後の樹脂層全面に、内包物の一例として軟膏剤を想定した下記組成の試薬を塗り、基材上に、樹脂層、試薬の層が順に形成された積層体を得た。
白色ワセリン 86%
流動パラフィン 5%
溶解剤 5%
界面活性剤 4%
該積層体2枚を試薬の塗布面が内側になるように重ね合わせた。これを40℃の恒温槽で3ヶ月間保管した後、樹脂層の状態を目視で確認した。確認時は、樹脂層面を傷つけ無いように上記試薬をふき取った。結果を表2に示す。
上記塗料1~7をアルミニウム製チューブの内面にスプレーガンにより塗装した(樹脂層の厚さ:約20μm)。各塗料について、塗装性および形成された樹脂層の外観を目視した結果を表3に示す。
Claims (15)
- 第一の水性分散体(A)と第二の水性分散体(B)とを含有し、
前記水性分散体(A)の分散質の平均粒子径が1~20μmであり、
前記水性分散体(B)の分散質の平均粒子径が、前記水性分散体(A)の分散質の平均粒子径の1/100~1/5であり、
前記水性分散体(A)の分散質と前記水性分散体(B)の分散質との質量比が2/1~100/1であることを特徴とする塗料。 - 前記水性分散体(A)の分散質が、ポリオレフィンと酸変性ポリオレフィンとから形成される粒子であり、
前記水性分散体(B)の分散質が、酸変性ポリオレフィン粒子であることを特徴とする請求項1に記載の塗料。 - 前記水性分散体(A)の分散媒が、水および炭素原子数1~4のアルコールからなる群より選択される少なくとも1種であることを特徴とする請求項1または2に記載の塗料。
- 前記水性分散体(B)の分散媒が、水および炭素原子数1~4のアルコールからなる群より選択される少なくとも1種であることを特徴とする請求項1~3のいずれか1項に記載の塗料。
- さらに溶媒を1~20質量%含有することを特徴とする請求項1~4のいずれか1項に記載の塗料。
- 前記溶媒は沸点が100~200℃の範囲内にある水溶性有機化合物であることを特徴とする請求項5に記載の塗料。
- 実質的に界面活性剤を含有しないことを特徴とする請求項1~6のいずれか1項に記載の塗料。
- JIS K5600-2-2に準じてフローカップNo.3により測定された粘度が80~400秒であることを特徴とする請求項1~7のいずれか1項に記載の塗料。
- 容器内面に、請求項1~8のいずれか1項に記載の塗料を塗布して得られる層(X)が形成されていることを特徴とする容器。
- 前記容器が金属製であることを特徴とする請求項9に記載の容器。
- 前記容器がアルミニウム製であることを特徴とする請求項9または10に記載の容器。
- 前記容器がチューブであることを特徴とする請求項9~11のいずれか1項に記載の容器。
- 前記チューブの口部が閉鎖膜であることを特徴とする請求項12に記載の容器。
- 前記層(X)の厚さが2~50μmであることを特徴とする請求項9~13のいずれか1項に記載の容器。
- 前記層(X)がスプレーガンを用いた塗装方法により形成されることを特徴とする請求項9~14のいずれか1項に記載の容器。
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EP09773413.1A EP2305757B1 (en) | 2008-07-01 | 2009-06-26 | Coating material and container coated with the coating material |
CN2009801259294A CN102066504A (zh) | 2008-07-01 | 2009-06-26 | 涂料及涂布有该涂料的容器 |
CA2729152A CA2729152C (en) | 2008-07-01 | 2009-06-26 | Coating material and container coated with the coating material |
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JP2020168813A (ja) * | 2019-04-04 | 2020-10-15 | 大日本印刷株式会社 | 包装材料の製造方法 |
Also Published As
Publication number | Publication date |
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US8394884B2 (en) | 2013-03-12 |
EP2305757A1 (en) | 2011-04-06 |
CA2729152C (en) | 2016-04-05 |
CA2729152A1 (en) | 2010-01-07 |
EP2305757B1 (en) | 2016-11-09 |
CN102066504A (zh) | 2011-05-18 |
EP2305757A4 (en) | 2011-12-07 |
JPWO2010001835A1 (ja) | 2011-12-22 |
US20110097525A1 (en) | 2011-04-28 |
JP5619608B2 (ja) | 2014-11-05 |
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