WO2010140575A1 - 容器の胴巻ラベル用二軸配向ポリエステルフィルム及び容器の胴巻用ラベル - Google Patents
容器の胴巻ラベル用二軸配向ポリエステルフィルム及び容器の胴巻用ラベル Download PDFInfo
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- WO2010140575A1 WO2010140575A1 PCT/JP2010/059232 JP2010059232W WO2010140575A1 WO 2010140575 A1 WO2010140575 A1 WO 2010140575A1 JP 2010059232 W JP2010059232 W JP 2010059232W WO 2010140575 A1 WO2010140575 A1 WO 2010140575A1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
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- C—CHEMISTRY; METALLURGY
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- C08K5/51—Phosphorus bound to oxygen
- C08K5/52—Phosphorus bound to oxygen only
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- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
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- C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
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- C08G63/16—Dicarboxylic acids and dihydroxy compounds
- C08G63/18—Dicarboxylic acids and dihydroxy compounds the acids or hydroxy compounds containing carbocyclic rings
- C08G63/181—Acids containing aromatic rings
- C08G63/183—Terephthalic acids
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
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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
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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
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Definitions
- the present invention relates to a biaxially oriented polyester film. More specifically, the first invention is a biaxially oriented polyester for body-wound labels for containers, comprising a polyester with a low oligomer content and capable of forming a film without impairing productivity and film quality. Related to film.
- the second invention relates to a biaxially oriented polyester film for a body-wrapped label for a container made of polyester having a low oligomer content and without causing troubles due to static electricity without impairing film quality.
- Aromatic polyesters typified by polyethylene terephthalate (PET) have excellent mechanical properties and chemical resistance, and are widely used as molded products such as fibers and films.
- PET resin is inexpensive and excellent in terms of hygiene, it is widely used as a food container, particularly a beverage container.
- PET (PET) bottles These containers are generally referred to as “PET (PET) bottles” and their usage is enormous.
- PET (PET) bottles have been recycled for some time. Its utilization method is attracting attention.
- a film made of PET is usually produced by melt-extruding PET from a die, rapidly cooling the extruded film-like melt on the surface of a rotating cooling drum to form an unstretched film, and then stretching the unstretched film in the longitudinal and lateral directions. Is done. In this case, in order to eliminate the surface defects of the film and increase the uniformity of the thickness, it is necessary to improve the adhesion between the film-like melt and the surface of the rotary cooling drum.
- the specific resistance is lowered by adding a magnesium compound and a phosphorus compound so that the ratio of the number of magnesium atoms and phosphorus atoms is in a specific range during PET production (see Patent Document 1). ). According to the above-mentioned document, it is also disclosed that by specifying the addition timing of the magnesium compound, sodium compound and phosphorus compound, foreign matters caused by the catalyst are reduced and the quality of the film is improved.
- PET recycled from recycled PET bottles has a high specific resistance value because it is not originally intended for film use, and it can be modified to improve electrostatic adhesion from the standpoint of film productivity. It is essential.
- recycled PET bottles are prone to contamination, contamination of attached labels, printing ink applied to the attached labels, foreign matter adhering to the bottles such as dust, etc.
- the quality of the film is lowered, for example, because these foreign matters become defects, and as a result, it may lead to a loss of appearance when used as a trunk-wrap label for beverage PET bottles. Therefore, in the case of such a product, the meaning of aiming at resource saving may be faded, and the demand for a product that reduces the environmental load without degrading the quality is increasing (see Patent Document 2).
- the conventional film is an insulator, there is a problem that static electricity is easily generated and accumulated. Static electricity causes trouble during processing, for example, in the manufacturing process, printing, bonding, and other secondary processing processes, the film wraps around the roll, shocks the human body in contact with the film, and handling becomes difficult It becomes a factor which reduces work efficiency. In addition, the product value is reduced such as generation of so-called printing whiskers, poor mounting properties after labeling, and contamination of the film surface.
- JP 59-64628 (Claims etc.) JP-A-7-138388 (paragraph numbers 0001 to 0005, etc.)
- an object of the first invention of the present invention is a body-wrap label for a container such as a beverage which is made of polyester with a low oligomer content, and does not impair the productivity and quality of the film, and hardly causes trouble due to static electricity. It is to provide a biaxially oriented polyester film.
- the second invention of the present invention provides a biaxially oriented polyester film for beverage roll-wrapping labels, which is made of polyester with a low oligomer content, does not impair the quality of the film, and hardly causes troubles due to static electricity. It is.
- this invention consists of the following structures. 1.
- the biaxially oriented polyester film for a container-wound label for a container according to the eighth aspect wherein polyethylene terephthalate having an ethylene terephthalate cyclic trimer content of 6000 ppm or less is recycled from a PET bottle. 10.
- the biaxial orientation for a wound label of a container according to the eighth or ninth aspect wherein a filter back pressure increase coefficient of polyethylene terephthalate having an ethylene terephthalate cyclic trimer content of 6000 ppm or less is 10 or less.
- Polyester film. 11 The biaxially oriented polyester film for trunk-wrapped labels for containers according to any one of the above 1 to 10, wherein the film has a Co-b value of 10 or less. 12
- the first invention of the present invention it is possible to provide a film for a body-wound label of a container that is made of polyester having a low oligomer content and does not impair the productivity and quality of the film.
- a film for a roll-wrapped label of a container which is made of a polyester having a low oligomer content for beverages and the like, and does not impair the quality of the film and hardly causes trouble due to static electricity. It is possible to provide.
- the film of the present invention may have a single layer structure of at least one layer, or may have a laminated structure of two or more layers. There may be two layers, three layers, four layers, and five layers. In the case of two layers, the laminated portion / base layer portion, in the case of three layers, the laminated portion (A) / base layer portion / laminated portion (B). In the case of three layers, the laminated portion (A) and the laminated portion (B) The same composition / configuration may be used, or different compositions, for example, a non-particle layer / base layer portion / particle-containing layer configuration may be used. Moreover, the thickness may be substantially the same or different. Preferably, the laminated part (A) and the laminated part (B) are designed to have the same composition because production is easy.
- the film of the present invention it is preferable that at least one of the layers constituting the film is biaxially oriented. Of the two or more layers, it is particularly preferable that all the layers are biaxially oriented. If all the layers are not oriented or uniaxially oriented, it is difficult to use for a wound label application, which is not preferable.
- At least one layer of the film of the present invention uses a polyethylene terephthalate raw material having a low oligomer content
- the oligomer content in the polyethylene terephthalate film is an ethylene terephthalate cyclic trimer content of 9000 ppm or less.
- the oligomer in the polyethylene terephthalate film includes unreacted terephthalic acid, bis-2-hydroxymethylethyl terephthalate (MHET), and bis-2-hydroxyethyl terephthalate (BHET).
- the polyester in the base layer may be a polyester that does not substantially contain particles, or may contain particles.
- the particle type is not particularly limited.
- the inorganic particles may be fine particles insoluble in polyester such as calcium carbonate, silica, kaolin, alumina, barium sulfate, titanium oxide, and organic particles such as crosslinked polystyrene. It may be contained, and may contain internal particles containing calcium or lithium.
- the polyethylene terephthalate film In order for the polyethylene terephthalate film to have an ethylene terephthalate cyclic trimer content of 9000 ppm or less, it is preferable to use a polyethylene terephthalate raw material with a low ethylene terephthalate cyclic trimer content.
- a polyethylene terephthalate raw material having an ethylene terephthalate cyclic trimer content of 6000 ppm or less is particularly preferably used.
- the cyclic trimer content of ethylene terephthalate is more preferably 5500 ppm or less, and particularly preferably 5000 ppm or less.
- the content of cyclic trimer of ethylene terephthalate may be 3000 ppm or more, or 4000 ppm or more.
- an ordinary polyethylene terephthalate polymerization resin is solid-phase polymerized to increase the degree of polymerization to form a cyclic trimer. It is reasonable to reduce the oligomer content, including the beginning.
- polyethylene terephthalate resin for PET bottles is often used for solid-state polymerized products with low oligomer content in relation to hygiene beverages, and pellets regenerated from collected PET bottles also have characteristics. inherited.
- the recycled material of the PET bottle preferably used for the film is mainly a recycled product of a container mainly composed of polyethylene terephthalate.
- a recycled product of a beverage container such as a tea beverage or a soft drink.
- Can be preferably used, may be appropriately oriented, and colorless ones are preferred, but some coloring components may be included.
- Recycled raw materials comprising PET bottles that can be preferably used are polyesters produced and molded by ordinary polymerization methods and solid-phase polymerization methods, preferably mainly composed of polyethylene terephthalate, and other polyester components and copolymerization components. May be included.
- the catalyst may contain a metal compound such as antimony, germanium and titanium, and a phosphorus compound as a stabilizer, and the intrinsic viscosity is preferably 0.55 or more, more preferably in the range of 0.60 to 0.80. preferable.
- germanium is often used as a catalyst for polyester for PET bottles, and when a film is formed using recycled PET bottle raw materials, 1 ppm or more of germanium is contained in the film. However, since it is the content of the catalyst to the last, it is usually 100 ppm or less at most, and usually 50 ppm or less.
- a processing method such as pulverization is not particularly limited, and a known general method can be applied, and a pulverized product of about 1 to 10 mm square is preferable.
- the melt specific resistance of the biaxially oriented polyester film is preferably 1.0 ⁇ 10 8 ⁇ ⁇ cm or less, but the polyester resin used for this purpose is melted at 285 ° C. according to the measurement method described later. It is preferable to adjust the specific resistance value to be 1.0 ⁇ 10 8 ⁇ ⁇ cm or less.
- the polyester resin having a melt specific resistance value at 285 ° C. exceeding 1.0 ⁇ 10 8 ⁇ ⁇ cm is used to avoid adhesion of the abnormal discharge described above, the molten resin Since cooling is performed while air is locally caught between the sheet and the cooling drum, pinner bubbles are generated on the sheet surface, which is not preferable. Further, in order to suppress the occurrence of pinner bubbles, it is necessary to reduce the production speed to such an extent that the discharged molten resin can be sufficiently adhered by the cooling drum, and the production cost increases.
- an alkaline earth metal compound and a phosphorus compound may be contained in the resin.
- a polyester resin containing an alkaline earth metal compound and a phosphorus compound may be mixed with PET recycled from a PET bottle.
- the alkaline earth metal atom (M2) in the alkaline earth metal compound has an action of reducing the melting specific resistance value of the resin.
- Alkaline earth metal compounds are usually used as catalysts in the production of esters from polyvalent carboxylic acids and polyhydric alcohols, but the specific resistance of the melt decreases by positively adding more than the required amount as a catalyst. The effect can be exhibited.
- the content of the alkaline earth metal compound be 20 ppm (mass basis, the same shall apply hereinafter) or more, preferably 22 ppm or more, more preferably 24 ppm or more, based on M2.
- the content of the alkaline earth metal compound is 400 ppm or less, preferably 350 ppm or less, more preferably 300 ppm or less on the basis of M2, and even if it is used more than this, an effect just commensurate with the amount. Rather, adverse effects such as the generation of foreign substances and coloring caused by this compound are increased.
- alkaline earth metal compounds include alkaline earth metal hydroxides, aliphatic dicarboxylates (acetates, butyrate, etc., preferably acetates), aromatic secondary carboxylates, phenolic hydroxyl groups. And a salt with a compound having a salt (such as a salt with phenol).
- the alkaline earth metal include magnesium, calcium, strontium, barium and the like (preferably magnesium). More specifically, magnesium hydroxide, magnesium acetate, calcium acetate, strontium acetate, barium acetate and the like can be mentioned, among which magnesium acetate is preferably used.
- the alkaline earth metal compounds can be used alone or in combination of two or more. Although there seems to be a definition that magnesium is not included in the alkaline earth metal nowadays, the present invention contemplates an alkaline earth metal having a definition including the conventional magnesium. In other words, an element of group IIa of the periodic table is intended.
- the phosphorus compound itself does not have an action of lowering the melting specific resistance value of the film, but it can contribute to the reduction of the melting specific resistance value by combining with an alkaline earth metal compound and an alkali metal compound described later.
- the reason for this is not clear, but it is thought that the inclusion of a phosphorus compound can suppress the generation of foreign substances and increase the amount of charge carriers.
- the content of the phosphorus compound is 10 ppm (mass basis, the same shall apply hereinafter) or more, preferably 11 ppm or more, more preferably 12 ppm or more, based on the phosphorus atom (P).
- the content of the phosphorus compound is below the above range, the effect of lowering the melt specific resistance value is not sufficient, and further, the amount of foreign matter generated tends to increase.
- the content of the phosphorus compound is 600 ppm or less, preferably 550 ppm or less, more preferably 500 ppm or less, based on P. Even if it is used more than this, an effect commensurate with the amount is not obtained. In addition, the effect of lowering the melt specific resistance value is saturated. Furthermore, the production of diethylene glycol is promoted and the physical properties of the film are lowered.
- Examples of the phosphorus compounds include phosphoric acids (phosphoric acid, phosphorous acid, hypophosphorous acid, etc.) and esters thereof (alkyl esters, aryl esters, etc.), as well as alkylphosphonic acids, arylphosphonic acids, and esters thereof (alkyls). Ester, aryl ester, etc.).
- Preferred phosphorus compounds include phosphoric acid, aliphatic esters of phosphoric acid (phosphoric acid alkyl esters, etc .; for example, phosphoric acid monomethyl ester, phosphoric acid monoethyl ester, phosphoric acid monobutyl ester, etc.
- Tri C1-6 alkyl phosphates such as di-C1-6 alkyl phosphates such as esters, dimethyl phosphate, diethyl phosphate, dibutyl phosphate, trimethyl phosphate, triethyl phosphate, tributyl phosphate Esters), aromatic esters of phosphoric acid (such as mono-, di-, or tri-C6-9 aryl esters of phosphoric acid such as triphenyl phosphate, tricresyl phosphate), aliphatic esters of phosphorous acid (of phosphorous acid) Alkyl esters and the like; for example, trimethyl phosphite, tributyl phosphite Any phosphorous acid mono-, di- or tri-C1-6 alkyl esters), alkylphosphonic acids (C1-6 alkylphosphonic acids such as methylphosphonic acid, ethylphosphonic acid), alkylphosphonic acid alkyl esters (di
- the alkaline earth metal compound and the phosphorus compound should be contained in the film at a mass ratio (M2 / P) of the alkaline earth metal atom (M2) and the phosphorus atom (P) of 1.2 to 5.0.
- M2 / P value is 1.2 or less, the effect of lowering the melt specific resistance value is significantly reduced. More preferably, it is 1.3 or more, More preferably, it is 1.4 or more.
- M2 / P value exceeds 5.0, it is not preferable because the generation of foreign matter is promoted and the film is colored more than the effect of lowering the melt specific resistance value. More preferably, it is 4.5 or less, More preferably, it is 4.0 or less.
- polyester resin melt in the extruder and remove foreign substances after filtering with a filter, extrude the molten resin from the die into a sheet, adhere to the cooling drum by electrostatic contact method, and cool and solidify Then, a polyester-based unstretched resin sheet is formed. Then, it extends
- the lateral thickness distribution adjusting method is possible by adjusting the interval between the lip mouths of the die.
- the width of the polyester resin sheet is reduced until the molten resin sheet is extruded from the die, adhered onto the cooling drum by the electrostatic contact method, cooled and solidified, and formed into a polyester unstretched sheet. It is necessary to adjust in consideration of an increase in thickness at both ends.
- the lateral thickness distribution of the end portion of the preferable polyester-based unstretched resin sheet is to increase the thickness of the portion that is not stretched (stretching residue) when laterally stretching in the end direction of the sheet.
- the electrostatic contact method used in the present invention is preferably based on an electrostatic charge imparting method using a wire electrode or a band electrode. Needle-like electrode has strong directivity of electricity generated from the electrode surface toward the molten polyester resin, and abnormal discharge is likely to occur, and manufacturing conditions prevent sheet tearing and scratching of the cooling drum due to this. This is not preferable because it is difficult to control.
- the diameter ⁇ of the wire electrode used in the present invention is preferably 0.05 to 1.0 mm, particularly preferably 0.08 to 0.5 mm. If the diameter ⁇ of the wire-like electrode is smaller than 0.05 mm, it is not preferable because it cannot withstand the tension applied to the wire-like electrode in order to prevent electrode shake due to resonance or mechanical vibration, and the wire is broken. On the other hand, when the diameter ⁇ is large at 1.0 mm, an excessive voltage and current are required to efficiently and uniformly apply the electrostatic charge to the molten resin sheet, and abnormal discharge is extremely likely to occur.
- the wire electrode used in the present invention is preferably one that can supply a new electrode at any time at a speed determined on a reel or the like.
- the monomer generated from the molten resin, sublimates such as linear oligomers and cyclic oligomers adhere to the electrode, so the electrostatic charge added when trying to obtain a good quality polyester-based unstretched resin sheet The amount must be increased over time, which increases the possibility of abnormal discharge, which is not preferable.
- this electrode moving device examples include a winding device manufactured by Nishida Kogyo Co., Ltd.
- Examples of the material of the wire electrode used in the present invention include tungsten, iron, nickel, cobalt, molybdenum, titanium, tantalum, aluminum, copper, stainless steel and the like, and these alloys may be used.
- the wire-like electrode used may be plated with gold, platinum or the like on the surface of the wire-like electrode for the purpose of improving touch resistance and oxidation resistance.
- the wire electrode used in the present invention applies tension to the wire electrode for the purpose of preventing electrode shake due to resonance, mechanical vibration, entrained air flow of resin, Coulomb force and the like.
- the tension applied to the wire-like electrode can be carried out within a range where no electrode shake occurs within the guaranteed tension range of the electrode material. Specifically, by applying a tension of 14.7 to 24.5 N to the wire-like electrode, it is possible to produce a polyester resin sheet in a state where the wire-like electrode is not cut and electrode blurring does not occur. is there. Further, as a device for applying such a constant tension to the wire-like electrode, a permanent torque (HC-4-4-J) manufactured by Koshin Seiko Co., Ltd. can be exemplified.
- a discharge preventing member for suppressing abnormal discharge at both ends of the wire electrode used in the present invention It is preferable to install a discharge preventing member for suppressing abnormal discharge at both ends of the wire electrode used in the present invention. This is because when a polyester resin melted from a die is extruded onto a cooling drum and electrostatically applied with a wire-like electrode, the end of a sheet with a large thickness at the closest distance from the wire-like electrode or an extruded polyester-based resin This is because abnormal discharge selectively occurs on the exposed cooling drum member that is not covered with resin, and the probability of occurrence of abnormal discharge can be lowered by installing the discharge preventing member at this position.
- the position of the discharge preventing member for suppressing abnormal discharge when manufacturing the polyester resin sheet is such that the end of the discharge preventing member is at a position of 5 to 30 mm inside from the end of the polyester resin sheet. It is preferable to be located at.
- a silicon-based resin and a fluorine-based resin are preferable from the viewpoint of workability, heat resistance, and insulation.
- silicon resin used in the present invention examples include vinyl methyl silicone, phenyl vinyl silicone, and fluorosilicone.
- fluororesin used in the present invention examples include tetrafluoroethylene polymer [Teflon (registered trademark)], tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA), and tetrafluoroethylene-hexafluoropropylene.
- Teflon registered trademark
- PFA tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer
- FEP tetrafluoroethylene-hexafluoropropylene.
- FEP copolymer
- tetrafluoroethylene-ethylene copolymer examples include a copolymer (FEP) and a tetrafluoroethylene-ethylene copolymer.
- the discharge preventing member used in the present invention is attached to the end of the wire electrode, and when the polyester resin sheet melted from the die is extruded onto the cooling drum and electrostatically applied with the wire electrode, A variable type that can be adjusted in accordance with the width of the resin sheet is preferable.
- the method for producing a high-quality polyester resin sheet without increasing the number of rotations of the cooling drum and without surface defects such as pinner bubbles is the voltage applied to the wire electrode.
- a method of raising the voltage value to a constant source or raising the voltage value based on a constant current and a method of making the current voltage flowing to the wire electrode constant and gradually approaching the wire electrode so as not to contact the polyester resin sheet.
- the voltage value is increased to a constant value or the voltage value is increased based on a constant current.
- the end of the polyester resin sheet Static electricity is applied with a needle-like electrode. This is to compensate for insufficient adhesion between the end of the polyester resin sheet blocked by the discharge preventing member and the cooling drum. If static electricity is not applied by the needle electrode, the end of the polyester resin sheet will be crystallized due to poor adhesion to the cooling drum, causing film breakage during lateral stretching and gripping of laterally stretched clips. This is not preferable.
- the biaxially oriented polyester film of the present invention preferably has less than 1 foreign material having a size of 1 mm or more per 1 m 2 of film, and can be said to be a film having good quality while using a polyester recycled raw material. . Most preferably 0.
- the number of the foreign substances having a small amount has a large relationship with the small increase in the filter back pressure of the plastic bottle recycling raw material described later.
- a filter back pressure increase coefficient of 10 or less are particularly preferable. More preferably, it is 5 or less, and particularly preferably 4 or less.
- the filter back pressure increase coefficient exceeds 10, troubles due to abnormal increase in the filter pressure of the extruder in the film forming process, transparency of the resulting film, coarse protrusions due to foreign matters, and foreign objects such as fish eyes are mixed. This is not preferable because it causes deterioration of film quality.
- the filter back pressure increase coefficient is most preferably 0, but it may be 1 or more in consideration of actual film forming properties.
- the PET bottle recycling material refers to a recycling material for polyethylene terephthalate containers such as PET bottles, and there are material recycling materials and chemical recycling materials, but only one or a mixture may be used.
- the filter of recycled plastic bottle material by material recycling is effective.
- flaked polyester obtained by pulverizing PET bottles is used as the starting material, it is melted in an extruder, filtered through a filter and pelletized, and the foreign matter mixed in is the same size as the filter used in the film forming process.
- the filter opening size is small. However, if a filter with a too small opening size is used at a stage where there are many impurities, the back pressure rises greatly and the process control becomes difficult.
- the filter may be gradually changed to a filter having a small opening size such as 200 mesh for the first time, 400 mesh for the second time, and 50 ⁇ m for the third time, and may be filtered three times or more.
- a fine filter 20 to 60 ⁇ m, for example, just before final pelletization, because a polyester recycled raw material sufficient for film specifications can be obtained.
- an anionic antistatic agent having an alkyl group having 10 to 20 carbon atoms is present on at least one side (preferably both sides).
- generation and accumulation of static electricity can be suppressed during secondary processing of the film, and various troubles caused by this static electricity can be prevented.
- It is an index of antistatic property to have a surface specific resistance of 13 log ⁇ or less under a relative humidity of 65% RH on at least one side of the film.
- the surface specific resistance exceeds 13 log ⁇ , the antistatic property is insufficient, which is not preferable. More preferably, it is 11 log ⁇ or less. However, it may be 2 log ⁇ or more practically.
- the biaxially oriented polyester film of the present invention is mainly used as a label for body winding on a container, but in a post-processing step of winding onto this container, static electricity deteriorates handling and induces a mistake in body winding. Antistatic properties are important.
- the anionic antistatic agent preferably has 12 to 18 carbon atoms.
- anionic antistatic agent examples include higher alcohol sulfuric acid ester salts, sulfuric acid ester salts of alkylphenol ethylene oxide adducts, sulfuric acid and sulfonic acid derivatives such as alkyl sulfonates and alkyl allyl sulfonates, and the like. And those having up to 20 alkyl groups. More specifically, alkyl sulfonate, alkyl benzene sulfonate, alkyl sulfate ester salt, alkyl ethoxy sulfate ester salt, alkyl phosphate ester salt and the like having an alkyl group having 10 to 20 carbon atoms can be mentioned. Among them, preferred are dodecyl sulfonate, dodecyl benzene sulfonate, and the like.
- the anionic antistatic agent to be present on the film surface
- an antistatic measure for the film in addition to the coating method, there is also a method (kneading method) in which an antistatic agent is kneaded into the raw material resin of the film and a film is formed using this.
- a film employing the kneading method the antistatic effect is exhibited by the antistatic agent oozing out from the inside of the film.
- polyester film since the glass transition temperature of polyester is generally high, the antistatic agent hardly oozes out on the film surface at a temperature near room temperature, and the antistatic effect tends to be insufficient.
- polyester film has a relatively high film-forming temperature, and the reactivity of polar groups of polyester is also high. If an antistatic agent is blended, deterioration of the polyester is promoted during film formation. Deterioration of physical properties may be caused or coloring may occur.
- the antistatic agent is directly present on the film surface, the antistatic effect is effectively exhibited regardless of the high glass transition temperature of the polyester, and the introduction of the antistatic agent is effective. Film deterioration and coloring can also be prevented.
- the timing for applying the coating solution containing the antistatic agent to the film surface is not particularly limited, and may be applied to an unstretched film after melt extrusion and before stretching, or after stretching (after uniaxial stretching or after biaxial stretching) ) May be applied (details will be described later).
- a mixed solvent of a lower alcohol having 1 to 3 carbon atoms and water is preferably used as a solvent.
- the lower alcohol having 1 to 3 carbon atoms those that can be mixed with water at an arbitrary ratio, such as methanol, ethanol, n-propanol, and isopropanol, are preferable.
- Alcohols having a large number of carbon atoms are not preferable because they are phase-separated from water when a coating solution is prepared, and application of such coating solutions tends to cause coating spots.
- a lower alcohol having 1 to 3 carbon atoms may be used in combination as long as phase separation does not occur.
- the lower alcohol is preferably 10% by mass or more in the coating solution.
- the amount of the lower alcohol is less than 10% by mass, the surface tension of the coating solution is increased, the wettability to the film is decreased, and coating spots are easily generated.
- a biaxially oriented film obtained by drying after application when the temperature and humidity change suddenly, the transparency of the film is lowered and the practicality may be impaired.
- the amount of lower alcohol in the coating solution is preferably 60% by mass or less. If the amount of lower alcohol exceeds 60% by mass, the amount of organic solvent in the coating solution will increase. It is necessary to take. In addition, when using alcohol with many carbon atoms simultaneously with lower alcohol, it is recommended that the total amount of alcohol in a coating liquid shall be 60 mass% or less.
- the amount of the anionic antistatic agent present on the film surface by application of the coating solution is preferably 0.001 to 0.5 g / m 2 . If the amount of the anionic antistatic agent is less than the above range, the antistatic effect may not be sufficiently secured. On the other hand, when the amount of the anionic antistatic agent exceeds the above range, the transparency and blocking resistance of the film may be lowered.
- the color b value (Co-b value) of the film is preferably 10 or less. More preferably, it is 5 or less, and particularly preferably 3 or less.
- the color b value (Co-b value) of the film exceeds 10, when the recovered pellets from the film are used as the film material, the film quality is remarkably deteriorated.
- the color b value is preferably small, but it may be 1.0 or more from the quality of the recovered pellets from the film.
- the heat shrinkage rate of the film is preferably 3% or less in both the film flow direction and the width direction after treatment with hot air at 150 ° C. for 30 minutes. More preferably, it is 2% or less. When the shrinkage rate of the film exceeds 3%, the dimensional stability is insufficient, and defects such as film shrinkage at the time of printing and the like are liable to occur.
- the shrinkage ratio of the film is preferably as close to 0% as possible, but it may be 0.1% or more in consideration of performance requirements in actual use.
- polyester resin For the polyester film of the present invention, polyethylene terephthalate, polybutylene terephthalate, polyethylene-2,6-naphthalate or a copolymer mainly composed of these resin components may be used.
- the biaxially stretched film is particularly suitable.
- the production method of these polymers is not particularly limited, and it is preferable to use a polyester in which the oligomer content is reduced by solid phase polymerization or solvent extraction of the polymer.
- the polyester film used in the present invention contains a heat stabilizer such as a polycondensation catalyst (in the case of an ester exchange method, an ester exchange reaction catalyst), phosphoric acid or a phosphoric acid compound as essential components.
- a heat stabilizer such as a polycondensation catalyst (in the case of an ester exchange method, an ester exchange reaction catalyst), phosphoric acid or a phosphoric acid compound as essential components.
- an appropriate amount of an alkali metal salt or an alkaline earth metal salt can be contained, and a sheet-like molten polyester resin is solidified by adhesion on a rotating cooling roll by an electrostatic application method, so that the thickness is unstretched. This is preferable because a sheet can be obtained.
- inert polyester particles should be included in the base polyester film. Is preferred.
- various additives can be contained in the polyester resin as necessary. Examples of the additive include an antioxidant, a light-resistant agent, an anti-gelling agent, an organic lubricant, an antistatic agent, an ultraviolet absorber, and a surfactant.
- the center layer of the film may contain substantially no particles, and the surface layer may contain fine particles.
- PET film Polyethylene terephthalate
- the PET resin and the PET bottle recycled raw material After sufficiently vacuum-drying the PET resin and the PET bottle recycled raw material, it is supplied to an extruder, melted and extruded from a T die to a molten PET resin of about 280 ° C. in a sheet form on a rotating cooling roll, and an electrostatic application method. Cool and solidify to obtain an unstretched PET sheet.
- the unstretched PET sheet may have a single layer structure or a multilayer structure by a coextrusion method.
- it is preferable that the inert particles are not substantially contained in the resin.
- the obtained unstretched PET sheet is stretched 2.5 to 5.0 times in the longitudinal direction with a roll heated to 80 to 120 ° C. to obtain a uniaxially stretched PET film. Further, the end of the film is gripped with a clip, led to a hot air zone heated to 70 to 140 ° C., and stretched 2.5 to 5.0 times in the width direction. Subsequently, the film is guided to a heat treatment zone of 160 to 240 ° C., and heat treatment is performed for 1 to 60 seconds to complete crystal orientation.
- the application of the anionic antistatic agent may be performed in an unstretched stage, after uniaxial stretching or after biaxial stretching, but it is efficient and preferable before the final heat setting.
- the biaxially oriented polyester film of the present invention is suitably used as a container winding label.
- the container mentioned here mainly refers to a relatively large 1 to 4 liter beverage bottle for beverages, etc., and if necessary, the film is printed and label-cut, and the beverage pet as described above. It is possible to wind the bottle body and attach it with an adhesive, a solvent or heat.
- the body-wound label referred to in the present invention does not require heat-shrinking equipment, unlike a label in which both ends of the label are bonded in advance to form a tube or a sleeve and then covered with a container and thermally contracted. So economical.
- the label can reduce heat shrinkage characteristics, and the change in quality such as heat shrinkage characteristics is small for stock storage under relatively high temperature conditions, and the label becomes easy to handle.
- Filter back pressure increase coefficient Polyester pellets are dried at 135 ° C for 12 hours and then extruded under conditions of a temperature of 285 ° C, a filter filtration diameter of 20 ⁇ m, a discharge rate of 6 g / min, and a discharge time of 4 hours, and the change in filter pressure every 30 minutes is recorded.
- K filter back pressure increase coefficient
- ⁇ P P1 ⁇ P0
- P1 Pressure pressure (MPa) after 4 hours of extrusion, P0 pressure at the start of extrusion (MPa), Q: Extrusion discharge amount (kg / hr),
- S Filter filtration area (cm 2 )
- IV Intrinsic viscosity
- the peak area of 70 ppm ethylene terephthalate cyclic trimer was obtained, and from the peak area of the ethylene terephthalate cyclic trimer in the chromatogram obtained by analyzing this and the sample under the above analysis conditions, HPLC The ethylene terephthalate cyclic trimer concentration contained in the test solution was determined. Using the ethylene terephthalate cyclic trimer concentration in the obtained test solution, the ethylene terephthalate cyclic trimer content contained in the sample was determined.
- Co-b value Color b value (Co-b value) was determined with a color difference meter (Nippon Denshoku Industries Co., Ltd., Z-1001DP).
- polyester A (Example of polyester synthesis)
- a slurry composed of terephthalic acid [86.4 parts by mass] and ethylene glycol [64.4 parts by mass] was charged and stirred as trioxide as a catalyst.
- Antimony [0.017 parts by mass] and triethylamine [0.16 parts by mass] were added.
- the temperature was raised by heating, and a pressure esterification reaction was carried out under conditions of a gauge pressure of 0.34 MPa and 240 ° C.
- esterification reaction vessel was returned to normal pressure, and magnesium acetate tetrahydrate [0.071 parts by mass] and then trimethyl phosphate [0.014 parts by mass] were added. Furthermore, after heating up to 260 degreeC over 15 minutes, the trimethyl phosphate [0.012 mass part] and then sodium acetate [0.0036 mass part] were added.
- the obtained esterification reaction product was transferred to a polycondensation reaction can, gradually heated from 260 ° C. to 280 ° C. under reduced pressure, and then subjected to a polycondensation reaction at 285 ° C. After the polycondensation reaction, filtration was performed with a stainless steel sintered filter having a pore size of 5 ⁇ m (initial filtration efficiency: 95%).
- PET polyethylene terephthalate
- Polyester D Antimony trioxide [0.025 parts by mass] is added as a catalyst to perform a pressure esterification reaction, and the inside of the esterification reaction vessel is returned to normal pressure. Magnesium acetate tetrahydrate [0.34 parts by mass] and then phosphoric acid Polyester D was added in the same manner as Polyester A, except that trimethyl [0.042 parts by mass] was added, the temperature was raised to 260 ° C. over 15 minutes, and then trimethyl phosphate [0.036 parts by mass] was added. Got.
- the content of inorganic components is the concentration based on each atom (unit: ppm; mass basis). Moreover, the origin of each inorganic component is as follows. Mg: Mainly derived from magnesium acetate tetrahydrate. P: Mainly derived from trimethyl phosphate.
- Polycondensation catalyst 100 mol% of dimethyl terephthalate (DMT) as a dicarboxylic acid component and 100 mol% of ethylene glycol (EG) as a glycol component In the molar ratio 2.2 times that of the methyl ester, 0.05 mol of zinc acetate (based on the acid component) as the transesterification catalyst, and 0.025 mol of antimony trioxide (acid) as the polycondensation catalyst.
- DMT dimethyl terephthalate
- EG ethylene glycol
- the ester exchange reaction was carried out while distilling off the methanol produced out of the system. Thereafter, a polycondensation reaction was performed at 280 ° C. under a reduced pressure of 26.7 Pa, followed by filtration by a conventional method to obtain a polyester (E).
- Polyester (C) Pelletized from the same flakes as the polyester (B), but filtered once with a 200 mesh filter to obtain a recycled material having a filter back pressure increase coefficient of 13.
- Coating liquid 1 Water was added to the dodecyl sulfonate to dilute it, and isopropanol was further added to obtain a coating solution having a solid content concentration of 2 mass% (dodecyl sulfonate: 2 mass%, water: 63 mass%, isopropanol: 35 mass%).
- Example 1 As raw materials, 40% by mass of polyester (A) and 60% by mass of polyester (B) were mixed and dried at 135 ° C. under reduced pressure of 33 Pa for 6 hours. Then melted and filtered twice with 100 ⁇ m and 50 ⁇ m filters, then supplied to an extruder, melt extruded into a sheet at about 280 ° C., and a wire electrode on a rotating cooled metal roll maintained at a surface temperature of 25 ° C. Was quenched and solidified at a rotational speed of 34 m / min by an electrostatic application method, to obtain an unstretched PET sheet having a thickness of 292 ⁇ m.
- the unstretched PET sheet was heated to 100 ° C. with a heated roll group and an infrared heater, and then stretched 4.1 times in the longitudinal direction with a roll group having a difference in peripheral speed to obtain a uniaxially stretched PET film.
- the coating solution 1 was applied to one side of a uniaxially stretched PET film by an air knife method so that the coating amount after drying was 0.008 g / m 2 , and subsequently 4 times in the width direction at 130 ° C. with a tenter.
- the film was stretched 2 times and fixed in the width direction of the film, heated at 229 ° C. for 2.6 seconds, and further relaxed in the width direction of 5.5% at 200 ° C. for 2.6 seconds.
- a biaxially stretched PET film having a thickness of 18 ⁇ m was obtained.
- the evaluation results are shown in Table 3.
- a biaxially stretched PET film having a thickness of 18 ⁇ m was obtained in the same manner as in Example 1. The evaluation results are shown in Table 3.
- Example 3 A biaxially stretched PET film having a thickness of 18 ⁇ m is obtained in the same manner as in Example 1 except that polyester (B) is 80% by weight and polyester (D) is 20% by weight as raw materials, and is quenched and solidified at a rotational speed of 60 m / min. It was. The evaluation results are shown in Table 3.
- Example 1 A biaxially stretched PET film having a thickness of 18 ⁇ m was obtained in the same manner as in Example 1 except that polyester (B) as a raw material was filtered once with a 100% by mass, 100 ⁇ m filter and the coating liquid 1 was not applied. .
- the evaluation results are shown in Table 3.
- Example 2 Example 1 except that 40% by mass of polyester (A) and 60% by mass of polyester (C) were mixed as raw materials, and changed to filtration once with a 100 ⁇ m filter, and coating solution 1 was not applied. Similarly, a biaxially stretched PET film having a thickness of 18 ⁇ m was obtained. The evaluation results are shown in Table 3.
- Example 4 40% by mass of polyester (E) and 60% by mass of polyester (B) were mixed as raw materials and dried at 135 ° C. for 6 hours under reduced pressure of 33 Pa. Thereafter, it was melted and filtered twice with 100 ⁇ m and 50 ⁇ m filters, then supplied to an extruder, melted and extruded into a sheet at about 280 ° C., and electrostatically charged on a rotating cooled metal roll maintained at a surface temperature of 25 ° C. The coating was quenched and solidified by application method to obtain an unstretched PET sheet having a thickness of 292 ⁇ m.
- the unstretched PET sheet was heated to 100 ° C. with a heated roll group and an infrared heater, and then stretched 4.1 times in the longitudinal direction with a roll group having a difference in peripheral speed to obtain a uniaxially stretched PET film.
- the coating solution 1 was applied to one side of a uniaxially stretched PET film by an air knife method so that the coating amount after drying was 0.008 g / m 2 , and subsequently 4 times in the width direction at 130 ° C. with a tenter.
- the film was stretched 2 times and fixed in the width direction of the film, heated at 229 ° C. for 2.6 seconds, and further relaxed in the width direction of 5.5% at 200 ° C. for 2.6 seconds.
- a biaxially stretched PET film having a thickness of 18 ⁇ m was obtained.
- the evaluation results are shown in Table 3.
- a biaxially stretched PET film having a thickness of 18 ⁇ m was obtained in the same manner as in Example 4. The evaluation results are shown in Table 3.
- Example 3 Comparative Example 3 except that 40% by mass of polyester (E) and 60% by mass of polyester (C) were mixed as raw materials, and the filter was changed to filtration once with a 100 ⁇ m filter, and the coating liquid 1 was not applied. Similarly, a biaxially stretched PET film having a thickness of 18 ⁇ m was obtained. The evaluation results are shown in Table 3.
- the present invention it is possible to obtain a film for a wound label of a container that uses raw materials regenerated from beverage PET bottles and does not easily cause trouble due to static electricity without impairing film productivity and film quality. it can. Furthermore, since the waste film that has not become a product at the time of manufacture can be collected and reused as a film raw material, it is useful in terms of economy and environmental load.
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Abstract
Description
すなわち、本発明は、以下の構成からなる。
1. 二軸配向ポリエチレンテレフタレートフィルムであって、エチレンテレフタレートの環状3量体含有量が9000ppm以下であり、温度285℃における溶融比抵抗が1.0×108Ω・cm以内であり、少なくとも片面の相対湿度65%下における表面固有抵抗が13logΩ以下であることを特徴とする容器の胴巻ラベル用二軸配向ポリエステルフィルム
2. フィルム1m2あたりに1mm大以上の異物が1.0個未満であることを特徴とする上記第1に記載の容器の胴巻ラベル用二軸配向ポリエステルフィルム。
3. フィルム中に少なくともアルカリ土類金属化合物をアルカリ土類金属元素の原子の量として20ppm以上含有し、且つリン化合物をリン原子の量として9ppm以上含有することを特徴とする上記第1又は第2に記載の容器の胴巻ラベル用二軸配向ポリエステルフィルム。
4. 二軸配向ポリエチレンテレフタレートフィルムであって、エチレンテレフタレートの環状3量体含有量が9000ppm以下であり、フィルム1m2あたりに1mm大以上の異物が1.0個未満であり、少なくとも片面の相対湿度65%下における表面固有抵抗が13logΩ以下であることを特徴とする容器の胴巻ラベル用二軸配向ポリエステルフィルム。
5. フィルムの少なくとも片面に炭素数10~20のアルキル基を有するアニオン系帯電防止剤が存在することを特徴とする上記第1~第4のいずれかに記載の容器の胴巻ラベル用二軸配向ポリエステルフィルム。
6. アニオン系帯電防止剤がフィルム製造工程内の最終熱処理前に塗布されることを特徴とする上記第1~第5のいずれかに記載の容器の胴巻ラベル用二軸配向ポリエステルフィルム。
7. 熱風150℃、処理時間30分における収縮率が、縦横いずれの方向においても3%以内であることを特徴とする上記第1~第6のいずれかに記載の容器の胴巻ラベル用二軸配向ポリエステルフィルム。
8. エチレンテレフタレートの環状3量体含有量が6000ppm以下であるポリエチレンテレフタレートが、10重量%以上含有されてなることを特徴とする上記第1~第7のいずれかに記載の容器の胴巻ラベル用二軸配向ポリエステルフィルム。
9. エチレンテレフタレートの環状3量体含有量が6000ppm以下であるポリエチレンテレフタレートが、ペットボトルからリサイクルされたものであることを特徴とする上記第8に記載の容器の胴巻ラベル用二軸配向ポリエステルフィルム。
10. エチレンテレフタレートの環状3量体含有量が6000ppm以下であるポリエチレンテレフタレートのフィルター背圧上昇係数が、10以下であることを特徴とする上記第8又は第9に記載の容器の胴巻ラベル用二軸配向ポリエステルフィルム。
11. フィルムのCo-b値が10以下であることを特徴とする上記第1~第10のいずれかに記載の容器の胴巻ラベル用二軸配向ポリエステルフィルム。
12. 上記第1~第11のいずれかに記載される二軸配向ポリエステルフィルムから作成されたことを特徴とする容器の胴巻用ラベル。
まず、本発明のフィルムは少なくとも1層の単層構造でもよく、2層以上の積層構造であってもよい。2層、3層、4層、5層であってもかまわない。2層の場合は積層部/基層部、3層の場合は積層部(A)/基層部/積層部(B)であり、3層の場合、積層部(A)と積層部(B)が同じ組成・構成であっても良く、異なった組成、例えば、無粒子層/基層部/粒子含有層の構成であっても良い。また、実質的に同じ厚さであってよく、異なった厚さであってもよい。好ましくは、積層部(A)と積層部(B)が同じ組成に設計することが生産が容易で望ましい。
及びエチレンテレフタレートの2~10量体などが含まれるが、通常最も含有量の多いエチレンテレフタレートの3量体の含有量を確認するのが精度良く測定でき好ましい。エチレンテレフタレートの環状3量体含有量が9000ppm以下であると、ポリエチレンテレフタレートフィルム製膜時の汚れが発生しにくく、特にキャスティングロール上に汚れが発生しにくいため、フィルム製品の製膜途中での異物混入リスクを低減できる効果がある。エチレンテレフタレートの環状3量体含有量は、より好ましくは9000ppm以下であり、更に好ましくは8000ppm以下、特に好ましくは7500ppm以下であり、最も好ましくは6500ppm以下である。しかしながら、極度に純度の高いポリエチレンテレフタレートフィルムを得ることは、コストアップを招くため、4000ppm以上でよく、5000ppm以上であっても構わない。
本発明のポリエステルフィルムは、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-2,6-ナフタレート又はこれらの樹脂の構成成分を主成分とする共重合体が用いられてもよいが、なかでもポリエチレンテレフタレートから形成された二軸延伸フィルムが特に好適である。これらの重合体の製法としては、特に限定するものではなく、固相重合または重合体を溶剤抽出等でオリゴマー含有量を低減したポリエステルを使用することが好ましい。
本発明の二軸配向ポリエステルフィルムの製造方法について、ポリエチレンテレフタレート(以下、PETと略記する)フィルムを例にして説明するが、これに限定されるものではない。
温度275℃で溶融した試料(チップまたはフィルム)中に一対の電極板を挿入し、120Vの電圧を印加する。その際の電流を測定し、下式に基づいて溶融比抵抗値Si(Ω・cm)を算出する。
Si=(A/I)×(V/io)
ここで、A:電極の面積(cm2)、I:電極間距離(cm)、V:電圧(V)、io:電流(A)である。
ポリエステルペレットを135℃で12時間乾燥後、温度285℃、フィルター濾過径20μm、吐出量6g/分、吐出時間4時間の条件で押出し、30分毎のフィルター圧力変化を記録し下記式にてフィルター背圧上昇係数を求めた。
K=ΔP/(Q/S)
ここで、K:フィルター背圧上昇係数、ΔP=P1-P0
P1:押出し4時間後圧力圧力(MPa)、P0押出し開始時の圧力(MPa)、Q:押出し吐出量(kg/hr)、S:フィルター濾過面積(cm2)
試料を白金ルツボにて灰化分解し、6mol/L塩酸を加えて蒸発乾固した。1.2mol/L塩酸で溶解し、ICP発光分析(島津製作所製、ICPS-2000)で定量した。
試料を炭酸ソーダ共存下において乾式灰化分解するか、硫酸・硝酸・過塩素酸系又は硫酸・過酸化水素水系において湿式分解し、リンを正リン酸とした。次いで、1mol/L硫酸溶液中においてモリブデン酸塩を反応させてリンモリブデン酸とし、これを硫酸ヒドラジンで還元して生ずるヘテロポリ青の830nmの吸光度を吸光光度計(島津製作所製、UV-150-02)で測定して比色定量した。
試料2gを白金ルツボにて灰化分解し、10%炭酸水素ナトリウム溶液5mlを加えて蒸発させ、さらに塩酸を加えて蒸発乾固した。電気炉にて400℃から950℃まで昇温し、30分間放置し、融解させた。水10mlに加温溶解させ、ゲルマニウム蒸留装置に移した(水洗7.5ml×2)。塩酸35mlを加え、蒸留して留出液25mlをとった。その中から適当量を分取し、最終濃度1~1.5mol/Lとなるように塩酸を加えた。0.25%ポリビニルアルコール溶液2.5ml、1%セチルトリメチルアンモニウムクロライド溶液2.5ml及び0.04%フェニルフルオロン(2,3,7-トリヒドロキシ-9-フェニル-6-フルオロン)溶液5mlを添加し、水にて25mlとした。Geとの黄色の錯体を形成させ、505nmの吸光度を吸光光度計(島津製作所製、UV-150-02)で測定して比色定量した。
得られたフィルムを250mm×250mmのフィルム片にし、スケール付き顕微鏡で、フィルム面に対して垂直方向から観察した時の1mm以上の直径を有する異物の数を250mm×250mm(0.0625m2)の範囲すべてについて計測する。これをフィルム片20枚に対して行い、得られた異物の総数を総観察面積(1.25m2)で除し、単位面積1m2当たりの異物の個数(個/m2)に換算し、小数第1位の桁を四捨五入した。
アドバンテスト社製表面固有抵抗測定器(本体:R8340、試料箱:R12704)を用いて、印加電圧100V、23℃・65%RHの雰囲気下で測定し、測定器の読取値を表面固有抵抗とした。
試料を130℃で一昼夜真空乾燥後、粉砕又は切断し、その80mgを精秤して、フェノール/テトラクロロエタン=60/40(体積比)の混合溶液に80℃で30分間、加熱溶解した。同じ混合溶液で20mlにした後、30℃で測定した。
サンプル約100mgを精秤し、1,1,1,3,3,3-ヘキサフルオロ-2-プロパノール/クロロホルム=2/3(v/v)、3mLで溶解した。クロロホルム
20mL を加え、メタノ-ル 10mL で再沈した。濾過後、濾液を濃縮乾固し乾固物をN,N-ジメチルホルムアミド、10mLで再溶解した。これを遠心濾過し、濾液を高速液体クロマトグラフィー(HPLC)に供した。
HPLC分析条件
装置: L-7000(日立製作所製)
カラム: μ-Bondasphere C18 5μ
100Å
3.9mm×15cm(Waters製)
溶離液A: 2%酢酸水溶液(v/v%)
溶離液B: アセトニトリル
グラジェントB%: 10%→100%,(0→55min);
100%→100%,(55→56min);
100%→ 10%,(56→60min)
流速: 0.8mL/min
検出: UV-258nm
カラム温度: 30℃
注入量: 10μL
(エチレンテレフタレート環状3量体の分析方法)
別途得られたエチレンテレフタレート環状3量体を用い、70ppmエチレンテレフタレート環状3量体含有量既知のDMF溶液を作成し、上記HPLC分析条件にて分析を行った。得られたクロマトグラムから70ppmのエチレンテレフタレート環状3量体のピーク面積を求め、これとサンプルを上記分析条件で分析することで得られたクロマトグラムのエチレンテレフタレート環状3量体のピーク面積から、HPLC供試液中に含まれるエチレンテレフタレート環状3量体濃度を求めた。得られた供試液中のエチレンテレフタレート環状3量体濃度を用いて、サンプル中に含まれるエチレンテレフタレート環状3量体含有量を求めた。
幅10mmにサンプリングして、200mmの間隔に標線をマークして、標線の間隔を測定(L 0)した後、そのフィルムを紙の間に挟み、150℃の温度に制御した熱風オーブンに入れ、30分処理した後、取り出した後、標線の間隔を測定(L)して、次式から熱収縮率を求めた。
熱収縮率(%)={(L 0-L)/L 0}×100
色差計(日本電色工業社製、Z-1001DP)により、カラーb値(Co-b値)を求めた。
実施例、比較例で得られるフィルムを西田工業株式会社製偏光板を使用して、目視で観察し、フィルム表面に発生するピンナーバブルを下記基準に従って評価した。○のものを合格とした。
○:ピンナーバブルの発生なし。
△:ピンナーバブルの発生が部分的に認められる。
×:ピンナーバブルの発生大。
(ポリエステルA)
エステル化反応缶を昇温して200℃に到達した時点で、テレフタル酸[86.4質量部]及びエチレングリコール[64.4質量部]からなるスラリーを仕込み、撹拌しながら、触媒として三酸化アンチモン[0.017質量部]及びトリエチルアミン[0.16質量部]を添加した。次いで加熱昇温を行い、ゲージ圧0.34MPa、240℃の条件で加圧エステル化反応を行った。
触媒として三酸化アンチモン[0.025質量部]を添加し加圧エステル化反応を行い、エステル化反応缶内を常圧に戻し、酢酸マグネシウム4水塩[0.34質量部]、次いでリン酸トリメチル[0.042質量部]を添加し、さらに、15分かけて260℃に昇温た後、リン酸トリメチル[0.036質量部]を添加とした以外はポリエステルAと同様にしてポリエステルDを得た。
Mg:主に酢酸マグネシウム4水塩に由来する。
P:主にリン酸トリメチルに由来する。
撹拌機、温度計および部分環流式冷却器を備えたステンレススチール製オートクレーブに、ジカルボン酸成分としてジメチルテレフタレート(DMT)100モル%と、グリコール成分として、エチレングリコール(EG)100モル%とを、グリコールがモル比でメチルエステルの2.2倍になるように仕込み、エステル交換触媒として酢酸亜鉛を0.05モル(酸成分に対して)と、重縮合触媒として三酸化アンチモン0.025モル(酸成分に対して)添加し、生成するメタノールを系外へ留去しながらエステル交換反応を行った。その後、280℃で26.7Paの減圧条件の下で重縮合反応を行い、常法により濾過してポリエステル(E)を得た。
ポリエステル(B):飲料用ペットボトルから残りの飲料などの異物を洗い流した後、粉砕して得たフレークを押出機で溶融し、順次目開きサイズの細かなものにフィルターを変えて2回更に細かな異物を濾別し、3回目に50μmの最も小さな目開きサイズのフィルターで濾別して、フィルター背圧上昇係数が3である再生原料を得た。
塗布液1
ドデシルスルホネートに水を加えて希釈し、さらにイソプロパノールを加えて固形分濃度が2質量%の塗布液(ドデシルスルホネート:2質量%、水:63質量%、イソプロパノール:35質量%)を得た。
原料としてポリエステル(A)を40質量%、ポリエステル(B)を60質量%の比率で混合し、33Paの減圧下、135℃で6時間乾燥した。その後、溶融し、100μmと50μmのフィルターで2回濾過した後、押出機に供給し、約280℃でシート状に溶融押し出しして、表面温度25℃に保った回転冷却金属ロール上でワイヤー電極による静電印加法により回転速度34m/minで急冷密着固化させ、厚さ292μmの未延伸PETシートを得た。
フィルムの構成を3層とし、中心層をポリエステル(B)100質量%、表層をポリエステル(A)100質量%とし、その厚み比率を表層/中心層/表層=20/60/20とした以外は実施例1と同様に厚さ18μmの二軸延伸PETフィルムを得た。評価結果を表3に示す。
原料としてポリエステル(B)を80重量%、ポリエステル(D)を20重量%とし、回転速度60m/minで急冷密着固化した以外は実施例1と同様に厚さ18μmの二軸延伸PETフィルムを得た。評価結果を表3に示す。
原料としてポリエステル(B)を100質量%、100μmのフィルターで1回濾過に変更し、塗布液1を未塗布とした以外は実施例1と同様に厚さ18μmの二軸延伸PETフィルムを得た。評価結果を表3に示す。
原料としてポリエステル(A)を40質量%、ポリエステル(C)を60質量%の比率で混合し、100μmのフィルターで1回濾過に変更し、塗布液1を未塗布とした以外は実施例1と同様に厚さ18μmの二軸延伸PETフィルムを得た。評価結果を表3に示す。
原料としてポリエステル(E)を40質量%、ポリエステル(B)を60質量%の比率で混合し、33Paの減圧下、135℃で6時間乾燥した。その後、溶融し、100μmと50μmのフィルターで2回濾過した後、押出機に供給し、約280℃でシート状に溶融押し出しして、表面温度25℃に保った回転冷却金属ロール上で静電印加法により急冷密着固化させ、厚さ292μmの未延伸PETシートを得た。
フィルムの構成を3層とし、中心層をポリエステル(B)100質量%、表層をポリエステル(E)100質量%とし、その厚み比率を表層/中心層/表層=20/60/20とした以外は実施例4と同様に厚さ18μmの二軸延伸PETフィルムを得た。評価結果を表3に示す。
原料としてポリエステル(E)を40質量%、ポリエステル(C)を60質量%の比率で混合し、100μmのフィルターで1回濾過に変更し、塗布液1を未塗布とした以外は実施例4と同様に厚さ18μmの二軸延伸PETフィルムを得た。評価結果を表3に示す。
Claims (12)
- 二軸配向ポリエチレンテレフタレートフィルムであって、エチレンテレフタレートの環状3量体含有量が9000ppm以下であり、温度285℃における溶融比抵抗が1.0×108Ω・cm以内であり、少なくとも片面の相対湿度65%下における表面固有抵抗が13logΩ以下であることを特徴とする容器の胴巻ラベル用二軸配向ポリエステルフィルム
- フィルム1m2あたりに1mm大以上の異物が1.0個未満であることを特徴とする請求項1に記載の容器の胴巻ラベル用二軸配向ポリエステルフィルム。
- フィルム中に少なくともアルカリ土類金属化合物をアルカリ土類金属元素の原子の量として20ppm以上含有し、且つリン化合物をリン原子の量として9ppm以上含有することを特徴とする請求項1又は2に記載の容器の胴巻ラベル用二軸配向ポリエステルフィルム。
- 二軸配向ポリエチレンテレフタレートフィルムであって、エチレンテレフタレートの環状3量体含有量が9000ppm以下であり、フィルム1m2あたりに1mm大以上の異物が1.0個未満であり、少なくとも片面の相対湿度65%下における表面固有抵抗が13logΩ以下であることを特徴とする容器の胴巻ラベル用二軸配向ポリエステルフィルム。
- フィルムの少なくとも片面に炭素数10~20のアルキル基を有するアニオン系帯電防止剤が存在することを特徴とする請求項1~4のいずれかに記載の容器の胴巻ラベル用二軸配向ポリエステルフィルム。
- アニオン系帯電防止剤がフィルム製造工程内の最終熱処理前に塗布されることを特徴とする請求項1~5のいずれかに記載の容器の胴巻ラベル用二軸配向ポリエステルフィルム。
- 熱風150℃、処理時間30分における収縮率が、縦横いずれの方向においても3%以内であることを特徴とする請求項1~6のいずれかに記載の容器の胴巻ラベル用二軸配向ポリエステルフィルム。
- エチレンテレフタレートの環状3量体含有量が6000ppm以下であるポリエチレンテレフタレートが、10重量%以上含有されてなることを特徴とする請求項1~7のいずれかに記載の容器の胴巻ラベル用二軸配向ポリエステルフィルム。
- エチレンテレフタレートの環状3量体含有量が6000ppm以下であるポリエチレンテレフタレートが、ペットボトルからリサイクルされたものであることを特徴とする請求項8に記載の容器の胴巻ラベル用二軸配向ポリエステルフィルム。
- エチレンテレフタレートの環状3量体含有量が6000ppm以下であるポリエチレンテレフタレートのフィルター背圧上昇係数が、10以下であることを特徴とする請求項8又は9に記載の容器の胴巻ラベル用二軸配向ポリエステルフィルム。
- フィルムのCo-b値が10以下であることを特徴とする請求項1~10のいずれかに記載の容器の胴巻ラベル用二軸配向ポリエステルフィルム。
- 請求項1~11のいずれかに記載される二軸配向ポリエステルフィルムから作成されたことを特徴とする容器の胴巻用ラベル。
Priority Applications (7)
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JP2010529164A JP5655566B2 (ja) | 2009-06-05 | 2010-06-01 | 容器の胴巻ラベル用二軸配向ポリエステルフィルム及び容器の胴巻用ラベル |
KR1020117031244A KR101660076B1 (ko) | 2009-06-05 | 2010-06-01 | 용기의 랩어라운드 라벨용 이축배향 폴리에스테르 필름 및 용기의 랩어라운드용 라벨 |
CN201080024846.9A CN102482437B (zh) | 2009-06-05 | 2010-06-01 | 容器体的卷绕标签用双轴取向聚酯膜以及用于卷绕在容器体上的标签 |
ES10783358.4T ES2528228T3 (es) | 2009-06-05 | 2010-06-01 | Etiqueta envolvente para envases hecha de película de poliéster orientada biaxialmente |
US13/375,714 US9005766B2 (en) | 2009-06-05 | 2010-06-01 | Biaxially-oriented polyester film for use as wrap-around container label, and wrap-around container label |
PL10783358T PL2439229T3 (pl) | 2009-06-05 | 2010-06-01 | Owijkowa etykieta na pojemnik wytworzona z dwuosiowo zorientowanej folii poliestrowej |
EP20100783358 EP2439229B1 (en) | 2009-06-05 | 2010-06-01 | Wrap-around container label made of biaxially-oriented polyester film |
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JP2013233781A (ja) * | 2012-04-13 | 2013-11-21 | Fujifilm Corp | ポリエステルフィルム、太陽電池モジュール用バックシートおよび太陽電池モジュール |
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JP2022002891A (ja) * | 2019-11-19 | 2022-01-11 | 大日本印刷株式会社 | 蒸着樹脂フィルム、該蒸着樹脂フィルムを備える積層体及び該積層体を備える包装容器 |
WO2021210466A1 (ja) * | 2020-04-13 | 2021-10-21 | 東洋紡株式会社 | ラミネート積層体 |
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JP2012091862A (ja) | 2012-05-17 |
EP2439229A1 (en) | 2012-04-11 |
JP5655566B2 (ja) | 2015-01-21 |
KR20120036895A (ko) | 2012-04-18 |
EP2439229A4 (en) | 2013-11-20 |
KR101660076B1 (ko) | 2016-09-26 |
CN102482437B (zh) | 2014-12-10 |
US20120088112A1 (en) | 2012-04-12 |
JP5699728B2 (ja) | 2015-04-15 |
JPWO2010140575A1 (ja) | 2012-11-22 |
ES2528228T3 (es) | 2015-02-06 |
US9005766B2 (en) | 2015-04-14 |
CN102482437A (zh) | 2012-05-30 |
PL2439229T3 (pl) | 2015-05-29 |
EP2439229B1 (en) | 2014-12-31 |
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