WO1999003917A2 - Films polyester composites a proprietes barriere - Google Patents
Films polyester composites a proprietes barriere Download PDFInfo
- Publication number
- WO1999003917A2 WO1999003917A2 PCT/EP1998/004379 EP9804379W WO9903917A2 WO 1999003917 A2 WO1999003917 A2 WO 1999003917A2 EP 9804379 W EP9804379 W EP 9804379W WO 9903917 A2 WO9903917 A2 WO 9903917A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- polyvinyl alcohol
- water
- film
- polyester
- coating
- Prior art date
Links
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- 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
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- 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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- 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
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
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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
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/042—Coating with two or more layers, where at least one layer of a composition contains a polymer binder
- C08J7/0423—Coating with two or more layers, where at least one layer of a composition contains a polymer binder with at least one layer of inorganic material and at least one layer of a composition containing a polymer binder
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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
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/0427—Coating with only one layer of a composition containing a polymer binder
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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
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/043—Improving the adhesiveness of the coatings per se, e.g. forming primers
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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
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/048—Forming gas barrier coatings
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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
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/08—Heat treatment
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/08—Metals
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/514—Oriented
- B32B2307/518—Oriented bi-axially
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/724—Permeability to gases, adsorption
- B32B2307/7242—Non-permeable
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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
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
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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
- C08J2429/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Derivatives of such polymer
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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
- C08J2429/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Derivatives of such polymer
- C08J2429/02—Homopolymers or copolymers of unsaturated alcohols
- C08J2429/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
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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
- C08J2467/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2467/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/08—Metals
- C08K2003/0812—Aluminium
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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
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S428/00—Stock material or miscellaneous articles
- Y10S428/91—Product with molecular orientation
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- 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]
- Y10T428/1379—Contains vapor or gas barrier, polymer derived from vinyl chloride or vinylidene chloride, or polymer containing a vinyl alcohol unit
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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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- Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
- Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]
- Y10T428/1379—Contains vapor or gas barrier, polymer derived from vinyl chloride or vinylidene chloride, or polymer containing a vinyl alcohol unit
- Y10T428/1383—Vapor or gas barrier, polymer derived from vinyl chloride or vinylidene chloride, or polymer containing a vinyl alcohol unit is sandwiched between layers [continuous layer]
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- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24355—Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.]
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- Y10T428/24975—No layer or component greater than 5 mils thick
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- Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
- Y10T428/263—Coating layer not in excess of 5 mils thick or equivalent
- Y10T428/264—Up to 3 mils
- Y10T428/265—1 mil or less
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- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31678—Of metal
- Y10T428/31681—Next to polyester, polyamide or polyimide [e.g., alkyd, glue, or nylon, etc.]
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- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31786—Of polyester [e.g., alkyd, etc.]
- Y10T428/31797—Next to addition polymer from unsaturated monomers
Definitions
- the present invention relates to polyester-based composite films having good gas barrier properties.
- Polyester films in particular polyethylene terephthalate, are widely used in the packaging field, because of their numerous advantages such as their mechanical properties, their transparency, their absence of toxicity, their absence of odor or taste.
- Patent EP-A-0 254 468 also describes a composite film composing a base film of synthetic thermoplastic polymer, such as polyamide, polyethylene, polypropylene or polyester, having 2 coatings on the same face of the base film; the first coating is adjacent to the base film and consists of a urethane primer in a solvent, which allows in the dry state to a dispersion in aqueous solution of polyvinyl alcohol to wet the primer, the second coating is placed on the dried and free surface of the first coating and comprises a material based on polyvinyl alcohol serving as a gas barrier.
- synthetic thermoplastic polymer such as polyamide, polyethylene, polypropylene or polyester
- the present invention consists of polyester films with good gas barrier properties, thanks to a coating comprising polyvinyl alcohol, placed directly on the surface of the polyester film without the presence of an adhesive intermediate layer, while having good adhesion properties between the polyester base film and the coating.
- a biaxially stretched composite film based on polyester and having improved barrier properties with respect to gases characterized in that it comprises a polyester base film having from 5 ⁇ m to 50 ⁇ m, coated on one of its two faces with a layer comprising polyvinyl alcohol, having a number-average degree of polymerization equal to or greater than 350 and a rate of hydrolysis equal to or greater than 95%, and a water-dispersible copolyester with sulfonyloxy units, and said composite film having an oxygen permeability measured at 23 ⁇ C at 50% relative humidity, less than or equal to 5 cm 3 / m 2/24 h.
- a hydrolysis (or saponification) rate of 95% of the polyvinyl alcohol means that said polyvinyl alcohol contains 95% of vinyl alcohol units in its formula.
- the terms hydrolysis rate, saponification rate or content of vinyl alcohol units will therefore be used interchangeably in the present text.
- the polyester constituting the base film can be chosen from the polyesters which are usually used for obtaining bi-oriented semi-crystalline films. These are linear film-forming polyesters, crystallizable by orientation and usually obtained from one or more aromatic dicarboxylic acids or their derivatives (esters of lower aliphatic alcohols or halides for example) and one or more aliphatic glycols .
- aromatic acids mention may be made of phthalic, terephthalic, isophthalic, naphthalenedicarboxylic acid-2,5; naphthalene-dicarboxylic-2,6.
- These acids can be associated with a minor amount of one or more aliphatic or cycloaliphatic dicarboxylic acids, such as adipic, azelaic, hexahydroterephthalic acids.
- aliphatic diols mention may be made of ethylene glycol; propanediol-1,3; butanediol-1, 4. These diols can be combined with a minor amount of one or more aliphatic diols more carbon condensed (neopentylglycol for example) or cycloaliphatic (cyclohexanedimethanol).
- the crystallizable film-forming polyesters are polyethylene terephthalates or polynaphthalene dicarboxylates and, in particular, polyethylene glycol terephthalate (PET) or butanediol-1,4 or copolyesters comprising at least 80 mol% of terephthalate units ethylene glycol.
- PET polyethylene glycol terephthalate
- the polyester is a polyethylene terephthalate, the intrinsic viscosity of which is measured at 25 ° C. in ortho-chlorophenol is between 0.6 and 0.75 dl / g.
- the polyester constituting the base film must be chosen so that its melting start temperature is higher than the temperature at which the bi-stretched film comprising the layer comprising polyvinyl alcohol and the water-dispersible copolyester is heated during its preparation.
- the average roughness Rz of the base film (as defined in standard DIN 4768) is less than or equal at 0.40 ⁇ m on the face of the film comprising the layer of polyvinyl alcohol and of water-dispersible copolyester and this said face has on average no more than 20 peaks having a height equal to or greater than 1 micrometer and no more than 150 peaks having a height between 0.4 and 1 micrometer, per square millimeter.
- the distribution of peak heights can in particular be determined, in a known manner, by observation with an interferometric microscope, making it possible to count the number of interference rings for light of known wavelength.
- the most frequently used interferometers are the NOMARSKI or MIRAU or MICHELSON interferometers.
- the face of the base film comprising the layer of polyvinyl alcohol and of water-dispersible copolyester has on average no more than 20 peaks having a height equal to or greater than 1 micrometer and no more than 100 peaks having a height of between 0.4 and 1 micrometer, per square millimeter.
- the water-dispersible copolyesters containing sulfonyloxy units present with the polyvinyl alcohol in the coating are copolyesters derived from at least one aromatic dicarboxylic acid and from at least one aliphatic diol and comprising a plurality of sulfonyloxy groups of general formula (I):
- M represents a hydrogen atom, an alkali or alkaline earth metal, an ammonium cation or a quaternary ammonium cation.
- water-dispersible copolyester is meant in the present application water-soluble copolyesters or copolyesters forming homogeneous stable dispersions.
- the water-dispersible copolyesters containing sulfonyloxy groups are known products, described in particular in patent FR 1,602,002 and in patent EP-A-0 540 374, to which reference may be made for more details on their preparation and their composition. They are obtained by polycondensation of one or more aromatic dicarboxylic acids with one or more aliphatic diols and at least one difunctional compound comprising at least one sulfonyloxy group of formula (I).
- the expression “sulfonyloxy group” will denote both the hydroxysulfonyl groups and the alkali, alkaline-earth or ammonium salts which are derived therefrom.
- aromatic dicarboxylic acids used to prepare the water-dispersible copolyesters mention may be made, for example, of terephthalic, isophthalic, orthophthalic, naphthalenedicarboxylic-1,4 acids. These acids can be used alone or in mixtures.
- terephthalic and isophthalic acids alone or in admixture with one another or with other aromatic dicarboxylic acids. Mixtures of terephthalic acid with one or more other aromatic dicarboxylic acids and in particular with isophthalic acid are very particularly suitable.
- the amount of terephthalic acid expressed in moles can vary between 20 and 99% of the total number of moles of non-sulfonated diacids and preferably between 30 and 95%.
- aliphatic dicarboxylic acids containing from 3 to 15 carbon atoms can be combined with the aromatic diacids. More particularly, all or part of the aromatic dicarboxylic acid used with terephthalic acid, such as isophthalic acid, can be replaced by one or more aliphatic acids, such as adipic, glutaric, succinic, suberic, sebacic acids, dodecanoic.
- diols used in the composition of water-dispersible copolyesters with sulfonyloxy groups mention may be made of ethylene glycol, butanediol-1, 4, butanediol-1, 5, propanediol-1, 3, propanediol-1, 2, dimethyl-2,2 propanediol-1, 3 (or neopentylglycol), pentanediol-1, 5, hexanediol- 1, 6, diethylene glycol, triethylene glycol, tetraethylene glycol, cyclohexanedimethanol.
- Ethylene glycol and its oligomers are particularly suitable. They can be present alone or as a mixture with one another and / or with other diols. The presence in the water-dispersible copolyesters of units originating from ethylene glycol and from its oligomers is preferred.
- the sulfonyloxy groups of the water-dispersible copolyesters are introduced via a difunctional compound with a sulfonyloxy group, capable of reacting with the diols during the polycondensation.
- a difunctional compound with a sulfonyloxy group capable of reacting with the diols during the polycondensation.
- examples of such compounds are cited in patent EP-A-0 540 374.
- the sulfonyloxy units originate from alkali metal salts of dicarboxylic aromatic acids, such as sulfoterephthalic, sulfoisophthalic, sulfophthalic, 4-sulfo naphthalene dicarboxylic acids.
- the dicarboxylic acid units containing sulfonyloxy units represent from 5 to 30 moles per 100 moles of dicarboxylic acid units and preferably from 8 to 15 moles per 100 moles.
- the coating of polyvinyl alcohol and water-dispersible copolyester has a weight ratio of polyvinyl alcohol / water-dispersible copolyester of 99/1 to 50/50. Preferably, this weight ratio polyvinyl alcohol / water-dispersible copolyester is between 97/3 and 80/20 and even more preferably between 95/5 and 85/15.
- the other side of the composite films of the invention, called the back side must have sufficient sliding properties to allow easy handling of the film, in particular its winding on the different guide rolls during stretching or its winding on itself. .
- inert solid fillers are generally mineral fillers, such as for example silica, titanium dioxide, zirconium dioxide, alumina, silica / alumina mixtures, silicates, calcium carbonate, barium sulfate. These fillers can also consist of polymer particles.
- the volume median diameter of the charges is generally between 1 and 10 micrometers and preferably between 1 and 5 micrometers.
- the filler content of the film is usually between 0.02% and
- An interesting variant of the invention consists in having a basic polyester film having surface properties, in particular roughness, different on each of its two faces.
- the different average roughnesses Rz can for example be equal to or greater than 0.15 micrometer on the dorsal face of the film, and less than or equal to 0.40 micrometer on the face of the base film comprising the coating of polyvinyl alcohol and of copolyester. water dispersible.
- polyester base film can consist of two layers having different surface properties, in particular roughness.
- Obtaining such asymmetrical films can be done according to the technique of coextrusion of 2 polyesters having different charge rates and, where appropriate, different charges. Conveniently the polyester used is the same for
- the layer to receive the coating of polyvinyl alcohol and water-dispersible copolyester is more lightly loaded.
- the relative thicknesses of the 2 polyester layers constituting the basic polyester film can vary widely.
- the weakly loaded layer receiving the coating of polyvinyl alcohol and of water-dispersible copolyester has a thickness greater than or equal to 0.5 ⁇ m, preferably greater than or equal to 1.0 ⁇ m. In the context of the invention, it is not excluded to obtain a polyester base film, having different surface properties on the two faces, by other means known from the prior art.
- This thickness can, if desired, be less than or equal to 0.60 ⁇ m, or even 0.20 ⁇ m, if it is desired to improve the recyclability of the film according to the invention. In practice, we rarely descend to thicknesses less than 0.05 ⁇ m.
- An advantageous variant of the composite films of the invention relates to said films which comprise, on the polyvinyl alcohol / water-dispersible copolyester coating, a layer of polyvinyl alcohol. This additional layer makes it possible to further decrease the gas permeability of the composite films. As an example, it generally has a thickness of 0.1 ⁇ m to 10 ⁇ m.
- the invention also relates to composite films such as those described above, which further comprise on one of their faces a printing layer or a printing primer or, on the free face of the coating of polyvinyl alcohol and of water-dispersible copolyester or, where appropriate, on the free face of the additional layer of polyvinyl alcohol, a metallic layer.
- the printing layer can be deposited by known printing methods, such as for example gravure, flexography, screen printing.
- inks in non-aqueous solution or dispersion will be used.
- the metal layer which is located on the surface of the polyvinyl alcohol / water-dispersible polyester coating which is not in contact with the polyester film, or on the free face of the additional layer of polyvinyl alcohol, is composed of a metal which can be deposited according to the various known techniques.
- the metal is most often chosen from aluminum, copper, chromium, nickel, silver.
- the metal preferably used is aluminum.
- the thickness of the metal layer is generally between 0.01 ⁇ m and
- a heat-sealable layer which can be of the polyolefin type (radical, linear polyethylenes, metallocenes, polypropylenes, ethylene-vinyl acetate copolymers, ionomer resins for example) and / or copolyester. These complex films can be obtained by lamination using single- or two-component adhesive, by extrusion-coating, by coextrusion or coating.
- This heat-sealable layer can have a single function as a sealable layer or have a double function as a sealable-peelable layer.
- the complex films thus produced can be used for making packaging, such as in particular sachets, lids of trays, over-packaging, intended to contain products sensitive to oxidation. They are particularly suitable for packaging in a modified atmosphere.
- the present invention also relates to a process for the preparation of films described above.
- the process consists of a process for the preparation of composite films based on a polyester film which comprises on one of its faces a polyvinyl alcohol / water-dispersible polyester coating, said process being characterized in that the base film is coated in polyester, on one of its faces, using an aqueous solution comprising a polyvinyl alcohol having at least 95% of vinyl alcohol units, said polyvinyl alcohol having in aqueous solution at 4% and at 20 ° C an equal viscosity or greater than 4 mPa.s and a water-dispersible copolyester, the polyvinyl alcohol / water-dispersible polyester coating can itself then be coated with an aqueous solution of polyvinyl alcohol, and in that said heat treatment film coated at a temperature of 170 ° C or higher.
- the thickness of the polyvinyl alcohol / water-dispersible polyester coating is preferably less than or equal to 3 micrometers.
- the thickness of the additional layer of polyvinyl alcohol is preferably 0.1 to 10 micrometers.
- the face of the polyester film on which the coating of the water-dispersible polyvinyl alcohol / copolyester solution is carried out average roughness Rz less than or equal to 0.40 ⁇ m and contains on average no more than 20 peaks having a height equal to or greater than 1 micrometer and no more than 150 peaks having a height between 0.4 and 1 micrometer, per millimeter square.
- the coating of the polyester base film with the aqueous polyvinyl alcohol / water-dispersible copolyester solution can be carried out online or in recovery.
- the thickness of the coating is smaller and it is preferable to have a more restrictive surface topography of the base film.
- it is advantageous for the coating with the aqueous polyvinyl alcohol solution / water-dispersible copolyester is produced on one side of the polyester film having on average no more than 20 peaks having a height equal to or greater than 1 micrometer and no more than 100 peaks having a height between 0.4 and 1 micrometer, per millimeter square.
- the surface thereof Before coating the base film, the surface thereof is generally subjected to a physical treatment (such as corona, flame, plasma for example) intended to ensure good spreading of the layer of polyvinyl alcohol on said base film.
- a physical treatment such as corona, flame, plasma for example
- This treatment makes it possible to bring the surface tension of the film stretched monoaxially to a value greater than that of the coating of polyvinyl alcohol / water-dispersible copolyester and preferably to a value equal to or greater than 54 mN.m.
- the aqueous polyvinyl alcohol / water-dispersible copolyester solution used generally has a concentration of 1% to 20% by weight by weight and preferably from 5% to 15% by weight by weight.
- a polyvinyl alcohol solution This solution is carefully prepared, first cold with simple stirring, then heating to a temperature not exceeding 95 ° C; after cooling, it is filtered. This solution must be free of gels. The absence of gels can be checked by means of turbidity, dry extract and refractive index measurements.
- the water-dispersible copolyester is dissolved or dispersed in this solution of polyvinyl alcohol.
- the weight ratio of polyvinyl alcohol / water-dispersible copolyester in said aqueous solution is from 99/1 to 50/50 and is preferably between 97/3 and 80/20 and even more preferably between 95/5 and 85/15.
- the polyvinyl alcohol used in the process of the invention is a commercially available compound. It can be used as it is or it can be prepared in particular by hydrolysis of vinyl carboxylates, more particularly polyvinyl acetates or their copolymers rich in vinyl acetate units, such as vinyl acetate / ethylene (or EVA) copolymers.
- the polyvinyl alcohol used comprises at least 95% of vinyl alcohol units (hydrolysis rate equal to or greater than 95%). Preferably it comprises at least 97% and even more preferably at least 98%.
- the polyvinyl alcohol used for the preparation of the polyvinyl alcohol / water-dispersible copolyester coating of the composite film of the present invention a viscosity in aqueous solution at 4% and at 20 ° C, measured in a Brookfield type device, equal to or greater than 4 centipoise (or 4 mPa.s), which corresponds, with the uncertainties related to the measurements, to one degree average polymerization number equal to or greater than 350.
- the choice of the concentration of the polyvinyl alcohol / water-dispersible copolyester solution, as well as the equipment used for the coating, is in particular conditioned by the desired thickness of the final layer of the polyvinyl alcohol / water-dispersible copolyester coating.
- coatings are commonly carried out using rotogravure rollers, according to the so-called "reverse etching" technique.
- the polyester base film is most often stretched longitudinally (that is to say in the machine direction) before said coating using the aqueous polyvinyl alcohol solution. / water-dispersible copolyester, without this variant being limiting.
- This stretching can be carried out in one or more stages, as can the stretching which follows the coating.
- the temperature at which the coated film is treated is preferably between 180 ° C and 240 ° C and even more preferably between 200 ° C and 230 ° C.
- the polyester base film can be prepared by extrusion of a polyester as defined above, comprising one or more inert fillers to give it, in particular, a sufficient slip. It can also be prepared by coextrusion on the one hand of a weaker loaded polyester and on the other hand of a charged polyester.
- the polyester base film comprises a rough loaded layer constituting the so-called dorsal face and a more weakly loaded layer, constituting the so-called ventral face which will receive the coating of the polyvinyl alcohol / water-dispersible copolyester solution.
- the loaded polyester layer generally has an average roughness Rz greater than or equal to 0.15 micrometers and preferably greater than or equal to 0.30 micrometers, while the unfilled or more lightly loaded ventral layer has a total roughness less than or equal to 0.40 micrometer and preferably less than or equal to 0.25 micrometer; as indicated previously, the face of the base film, on which the coating will be carried out using the polyvinyl alcohol / water-dispersible copolyester solution, preferably does not have on average no more than 20 peaks having a height equal to or greater than 1 micrometer and no more than 100 peaks having a height between 0.4 and 1 micrometer, per square millimeter.
- the metal layer is deposited by any known means. Preferably, the vacuum metal evaporation technique is used.
- the composite films of the invention exhibit excellent resistance to mechanical attack, such as in particular creasing or folding. This means that their barrier properties already mentioned are not or are little diminished after such mechanical aggression.
- a composite film of polyethylene terephthalate (PET) is prepared by coextrusion on the one hand of a PET comprising 0.7% of silica obtained by precipitation of gels and having an average diameter of 3.3 micrometers (measurement on a granulometer SYMPATEC brand laser and Hélo type) which constitutes the most loaded film (dorsal part of the composite support film) and on the other hand a weaker charged PET (0.025% of the same silica) whose outer face will receive the polyvinyl alcohol (PVA) / water-dispersible copolyester (COPO) coating.
- PVA polyvinyl alcohol
- CO water-dispersible copolyester
- the polyester film has a thickness of 12 micrometers in the various examples or comparative tests and an average roughness Rz on the dorsal face of 0.45 micrometer. It comprises the weakly charged layer (receiving the coating of PVA / water-dispersible copolyester) which has a thickness of 11.2 micrometers.
- the coextruded film is first stretched longitudinally with a stretch ratio of 3.4; then he undergoes a corona treatment which brings his surface tension to 58 mN.m.
- the face of the film comprising the weaker loaded layer is then coated using a heliographic coating system with an engraved roller.
- the machine speed during coating is 200 m / min.
- the on-line coating (EEL) is carried out from an aqueous solution of PVA and COPO at 10% concentration, carefully prepared and free from gels.
- the PVA used has 98-99% of vinyl alcohol units and a viscosity of 5.5 mPa.s (measured at 20 ° C. on a 4% aqueous solution using a viscometer from the Brookfield LV brand).
- the COPO used is a copolyester of ethylene and diethylene, of number average molecular mass of approximately 33,000 and comprising terephthalate and isophthalate units in an amount of approximately 80/20 by weight and 14% by weight of units 5-sodio-oxysulfonyl isophthalate relative to the total weight of the copolyester
- the coated film then undergoes a transverse stretching with a rate of 4, then it is heat treated at a temperature of 225 ° C.
- the thickness of the APV / COPO layer is indicated for each example or comparative test.
- a repeat coating is carried out on the bi-stretched film (longitudinal stretching with a stretching rate of 3.4, then transverse stretching with a rate of 4).
- Examples 3 and 4 Example 3 and 4 were carried out on the same polyester composite film, but after the in-line coating carried out with an APV / COPO solution, a recovery coating on the bi-stretched film is carried out on the APV / COPO coating. with an aqueous solution of PVA alone.
- the measurements are the same as for the other examples and the results are collated in Table 1 below.
- Example 5 and comparative test e These tests are carried out with the same polyester composite film as in Examples 1 and 2, by performing an in-line coating with an aqueous APV / COPO solution (Example 5) or an aqueous solution of APV alone ( comparative test e) having a total concentration in the solution of 12%.
- the APV / COPO weight ratio is 90/10 and the APV has a saponification rate of 98%.
- These films are metallized by depositing an aluminum layer of 0.035 ⁇ m.
- the PO2 of the metallized films is measured under the conditions indicated for the previous examples.
- Each of the two metallized films is laminated with a polyethylene film (50 ⁇ m) using a polyurethane adhesive and an adhesion test is carried out.
- This test consists in applying traction to the film on an INSTRON 1122 brand device with a speed of 100 mm / min. A peeling force expressed in grams per 15 millimeters is thus measured. A peel strength of 150 g / 15 mm is considered satisfactory for metallized commercial films.
- the PO2 of the films is measured under the conditions indicated for the previous examples.
- Each of the two films is laminated with a polyethylene film (50 ⁇ m) using a polyurethane adhesive and the adhesion test described for Example 5 and the comparative test e are carried out.
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Inorganic Chemistry (AREA)
- Laminated Bodies (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
- Coating Of Shaped Articles Made Of Macromolecular Substances (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Paints Or Removers (AREA)
Abstract
Description
Claims
Priority Applications (10)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU90659/98A AU9065998A (en) | 1997-07-17 | 1998-07-14 | Composite polyester films with barrier properties |
JP2000503138A JP4204188B2 (ja) | 1997-07-17 | 1998-07-14 | 気体遮蔽性を有するポリエステル複合フィルム |
EP98942555A EP0996663B1 (fr) | 1997-07-17 | 1998-07-14 | Films polyester composites a proprietes barriere |
US09/423,094 US6420004B1 (en) | 1997-07-17 | 1998-07-14 | Composite polyester films with barrier properties |
BR9811007-1A BR9811007A (pt) | 1997-07-17 | 1998-07-14 | Filme compósito estirado biaxialmente,e, processo de preparação do mesmo |
AT98942555T ATE207096T1 (de) | 1997-07-17 | 1998-07-14 | Polyester-verbundfolien mit barriereeigenschaften |
DK98942555T DK0996663T3 (da) | 1997-07-17 | 1998-07-14 | Polyester kompositfolier med barriereegenskaber |
DE69802089T DE69802089T2 (de) | 1997-07-17 | 1998-07-14 | Polyester-verbundfolien mit barriereeigenschaften |
KR10-2000-7000191A KR100524366B1 (ko) | 1997-07-17 | 1998-07-14 | 배리어성을 갖는 폴리에스테르 복합 필름 |
CA002295857A CA2295857C (fr) | 1997-07-17 | 1998-07-14 | Films polyester composites a proprietes barriere |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9709314A FR2766199B1 (fr) | 1997-07-17 | 1997-07-17 | Films polyester composites a proprietes barriere |
FR97/09314 | 1997-07-17 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO1999003917A2 true WO1999003917A2 (fr) | 1999-01-28 |
WO1999003917A3 WO1999003917A3 (fr) | 2001-12-20 |
Family
ID=9509498
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1998/004379 WO1999003917A2 (fr) | 1997-07-17 | 1998-07-14 | Films polyester composites a proprietes barriere |
Country Status (13)
Country | Link |
---|---|
US (1) | US6420004B1 (fr) |
EP (1) | EP0996663B1 (fr) |
JP (1) | JP4204188B2 (fr) |
KR (1) | KR100524366B1 (fr) |
AT (1) | ATE207096T1 (fr) |
AU (1) | AU9065998A (fr) |
BR (1) | BR9811007A (fr) |
CA (1) | CA2295857C (fr) |
DE (1) | DE69802089T2 (fr) |
DK (1) | DK0996663T3 (fr) |
ES (1) | ES2165699T3 (fr) |
FR (1) | FR2766199B1 (fr) |
WO (1) | WO1999003917A2 (fr) |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6788463B2 (en) | 1998-01-13 | 2004-09-07 | 3M Innovative Properties Company | Post-formable multilayer optical films and methods of forming |
US6543208B1 (en) * | 1999-09-10 | 2003-04-08 | Ishida Co., Ltd. | Food-packaging bag, method of food packaging, and use of laminated film as food-packaging bag |
DE10002177A1 (de) * | 2000-01-20 | 2001-07-26 | Mitsubishi Polyester Film Gmbh | Amorphe, transparente, UV Licht absorbierende, thermoformbare Folie, ein Verfahren zu ihrer Herstellung und ihrer Verwendung |
US20020110685A1 (en) * | 2001-02-09 | 2002-08-15 | Ikuko Ebihara | Tie layers for PVA coatings |
CN1476460A (zh) * | 2001-09-05 | 2004-02-18 | ���˶Ű�����ձ���ʽ���� | 易与油墨接收层粘合的聚酯薄膜 |
US6709735B2 (en) * | 2001-11-14 | 2004-03-23 | Mitsubishi Polyester Film, Llc | Oxygen barrier coating and coated film |
DE10221141B4 (de) * | 2002-05-11 | 2005-07-14 | Huhtamaki Ronsberg, Zweigniederlassung Der Huhtamaki Deutschland Gmbh & Co. Kg | Kunststoffolie |
US7413800B2 (en) * | 2004-03-22 | 2008-08-19 | Terphane Inc. | Co-extruded biaxially oriented sealable, peelable film and process for its production |
US20070004299A1 (en) * | 2005-06-17 | 2007-01-04 | Toray Plastics (America), Inc. Lumirror Division | Barrier film with enhanced adhesive properties |
FR2962129B1 (fr) | 2010-07-05 | 2012-08-10 | Enscr | Materiau polymere biodegradable barriere et film contenant ce materiau |
JP7195039B2 (ja) | 2015-10-16 | 2022-12-23 | 株式会社Adeka | 樹脂組成物およびこれを用いた光学フィルム |
KR102491633B1 (ko) * | 2016-06-30 | 2023-01-20 | 코오롱인더스트리 주식회사 | 열수축성 폴리에스테르계 필름, 이의 제조방법 및 이를 포함하는 라벨 |
US11052346B2 (en) * | 2018-05-23 | 2021-07-06 | Molecule Works Inc. | Device and method for separation of water from mixtures |
DE112020006003T5 (de) | 2019-12-06 | 2022-11-03 | Kuraray Co., Ltd. | Mehrschichtstruktur, verfahren zu deren herstellung, verpackungsmaterial und produkt, welche diese umfassen, sowie schutzfolie für eine elektronische vorrichtung |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0274662A1 (fr) * | 1986-12-16 | 1988-07-20 | Hoechst Aktiengesellschaft | Matériau à dessiner |
WO1989008558A1 (fr) * | 1988-03-09 | 1989-09-21 | Rhone-Poulenc Films | Films polyester composites a adherence amelioree et leur procede d'obtention |
EP0675158A2 (fr) * | 1994-03-31 | 1995-10-04 | Rhone-Poulenc Films | Films polyesters composites à propriétés barrière |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6063161A (ja) * | 1983-09-16 | 1985-04-11 | ダイアホイルヘキスト株式会社 | ポリエステルフイルム |
JPS61270153A (ja) * | 1985-05-24 | 1986-11-29 | 東洋紡績株式会社 | 易接着性フイルム |
FR2608507B1 (fr) * | 1986-12-23 | 1989-03-31 | Rhone Poulenc Films | Films polyester composites a adherence amelioree et leur procede d'obtention |
-
1997
- 1997-07-17 FR FR9709314A patent/FR2766199B1/fr not_active Expired - Lifetime
-
1998
- 1998-07-14 DK DK98942555T patent/DK0996663T3/da active
- 1998-07-14 EP EP98942555A patent/EP0996663B1/fr not_active Expired - Lifetime
- 1998-07-14 US US09/423,094 patent/US6420004B1/en not_active Expired - Lifetime
- 1998-07-14 ES ES98942555T patent/ES2165699T3/es not_active Expired - Lifetime
- 1998-07-14 CA CA002295857A patent/CA2295857C/fr not_active Expired - Fee Related
- 1998-07-14 WO PCT/EP1998/004379 patent/WO1999003917A2/fr active IP Right Grant
- 1998-07-14 BR BR9811007-1A patent/BR9811007A/pt not_active IP Right Cessation
- 1998-07-14 AU AU90659/98A patent/AU9065998A/en not_active Abandoned
- 1998-07-14 JP JP2000503138A patent/JP4204188B2/ja not_active Expired - Fee Related
- 1998-07-14 KR KR10-2000-7000191A patent/KR100524366B1/ko not_active IP Right Cessation
- 1998-07-14 AT AT98942555T patent/ATE207096T1/de not_active IP Right Cessation
- 1998-07-14 DE DE69802089T patent/DE69802089T2/de not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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EP0274662A1 (fr) * | 1986-12-16 | 1988-07-20 | Hoechst Aktiengesellschaft | Matériau à dessiner |
WO1989008558A1 (fr) * | 1988-03-09 | 1989-09-21 | Rhone-Poulenc Films | Films polyester composites a adherence amelioree et leur procede d'obtention |
EP0675158A2 (fr) * | 1994-03-31 | 1995-10-04 | Rhone-Poulenc Films | Films polyesters composites à propriétés barrière |
Non-Patent Citations (2)
Title |
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DATABASE WPI Section Ch, Week 8521 Derwent Publications Ltd., London, GB; Class A23, AN 85-125285 XP002061849 & JP 60 063161 A (DIAFOIL CO LTD) , 11 avril 1985 * |
DATABASE WPI Section Ch, Week 8702 Derwent Publications Ltd., London, GB; Class A23, AN 87-011652 XP002061850 & JP 61 270153 A (TOYOBO KK) , 29 novembre 1986 * |
Also Published As
Publication number | Publication date |
---|---|
DK0996663T3 (da) | 2002-02-11 |
EP0996663B1 (fr) | 2001-10-17 |
WO1999003917A3 (fr) | 2001-12-20 |
US6420004B1 (en) | 2002-07-16 |
FR2766199A1 (fr) | 1999-01-22 |
CA2295857A1 (fr) | 1999-01-28 |
AU9065998A (en) | 1999-02-10 |
JP4204188B2 (ja) | 2009-01-07 |
FR2766199B1 (fr) | 1999-10-22 |
ES2165699T3 (es) | 2002-03-16 |
KR100524366B1 (ko) | 2005-10-28 |
DE69802089T2 (de) | 2002-07-04 |
KR20010021633A (ko) | 2001-03-15 |
EP0996663A1 (fr) | 2000-05-03 |
CA2295857C (fr) | 2003-12-09 |
ATE207096T1 (de) | 2001-11-15 |
DE69802089D1 (de) | 2001-11-22 |
BR9811007A (pt) | 2000-08-22 |
JP2001510110A (ja) | 2001-07-31 |
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