Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
  • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
  • B29C55/10—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial
  • B29C55/12—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial
  • B29C55/14—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial successively
  • B29C55/143—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial successively firstly parallel to the direction of feed and then transversely thereto
• • 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
• • 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
  • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
• • 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
• • 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
• • 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
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
  • B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
• • 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
  • B32B2250/00—Layers arrangement
  • B32B2250/02—2 layers
• • 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
  • B32B2250/00—Layers arrangement
  • B32B2250/24—All layers being polymeric
• • 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
• • 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
  • B32B2307/732—Dimensional properties
• • 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
  • B32B2307/732—Dimensional properties
  • B32B2307/734—Dimensional stability
• • 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
  • B32B2553/00—Packaging equipment or accessories not otherwise provided for
• • 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
• • 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
  • C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
• • 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
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
  • Y10T156/11—Methods of delaminating, per se; i.e., separating at bonding face
  • Y10T156/1142—Changing dimension during delaminating [e.g., crushing, expanding, warping, etc.]
  • Y10T156/1147—Using shrinking or swelling agent during delaminating
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/31504—Composite [nonstructural laminate]
  • Y10T428/31786—Of polyester [e.g., alkyd, etc.]
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/31504—Composite [nonstructural laminate]
  • Y10T428/31786—Of polyester [e.g., alkyd, etc.]
  • Y10T428/31797—Next to addition polymer from unsaturated monomers

Definitions

• the subject of the present invention is new polyester films which can be used in particular for the preparation, by extrusion-coating, of composite films comprising on at least one of the faces of the polyester film a layer of an olefin polymer as well as the composite films which result.
• Composite films comprising a layer of oriented semi-crystalline polyester and, on at least one face, a layer of an olefinic polymer and in particular of polyethylene, are used in the field of packaging as a sealing tape to ensure the sealing of many containers intended to contain liquids (milk, fruit juice, wines). The most common method of manufacturing these composite films
• double-sided coated composite films composite films comprising a polyolefin coating on each side of the polyester support film, hereinafter called “double-sided coated composite films", the complex film resulting from the first extrusion-coating step is subjected after cooling to a new identical operation on the uncoated polyester side.
• the coating extrusion process suffers from the disadvantage of leading to composite films having various anomalies with regard to the polymer bond.
• the delamination force (that is to say the force necessary to break the bond between the polyoffinic coating and the support film) varies, during the delamination, between extreme values on either side of an average value. This fluctuation in the delamination strength makes its determination random and imprecise and harms the industrial and commercial interest of composite films. It has been found that it can affect the two polyolefinic coating layers when the support film has been the subject of a double extrusion-coating and that it can manifest itself whatever the average value of the delamination force.
• the delamination force of the layer resulting from the second extrusion-coating is less than the delamination force of the polyolefin layer placed on the other side of the polyester film during the first extrusion-coating phase and may take values lower than the minimum value required for certain applications in the packaging field, i.e. a value less than 200 g / 10 mm.
• the polyester support film is brought into contact with the olefin polymer brought to a temperature of the order of 280 to 330 ° C., depending on the nature of the latter and / or conditions of
• the extrusion-coating then it is cooled to room temperature.
• the polyester support film is subjected to a second thermal shock when another polyolefin coating is placed on its second face.
• the sudden rise in the temperature of the film can cause changes in its structure which can be the cause of the anomalies noted.
• the rapid and more or less significant fluctuations in the delamination force are due to a variation in the dimensions of the support film at a temperature greater than 200 ° C. and in particular to a shrinkage in the cross direction that is too great at this temperature.
• a first objective pursued by the present invention lies in the solution of the problem posed by the large and rapid variation of the delamination force of the polyolefin coating during delamination.
• a second objective pursued by the present invention lies in the solution of the problem posed by the low value of the delamination force of the second polyolefin coating coated on a polyester film support by extrusion-coating.
• the present invention relates to oriented semi-crystalline polyester films, which can be used in particular for the manufacture of composite films by extrusion-coating of ofefinic polymers, characterized in that they have a coefficient
• planar orientation ⁇ p greater than or equal to 165 ⁇ 10 -3 and a cross shrinkage rate at 200oC less than or equal to 2.7%.
• polyester films having a through shrinkage rate of less than or equal to 2.7% and preferably less than or equal to 2.6% give practically no more or only a small amplitude to the fluctuation phenomenon of the delamination force of the polyolefin coating layer (s) and that polyester films whose planar orientation coefficient ⁇ p is greater than or equal to 165 ⁇ 10 -3 have a high delamination force value of the polyolefin coating layer deposited on its second face during a double-sided extrusion-coating.
• polyester support films in accordance with the invention make it possible to obtain composite films with at least one polyolefin coating, the fluctuation of the delamination force being less than or equal to 20%, preferably 15% and even more preferably at 5% on either side of its average value, and the average value of the delamination force of the second layer of polyolefin coating in the case of a double-sided extrusion-coating is greater than or equal to 200 g / 10 mm.
• thermal shrinkage rate denotes the variation in size of the film in the direction perpendicular to the direction of longitudinal stretching, relative to its initial dimension, at a temperature of 200 ° C.
• planar orientation of the film designates the orientation of the benzene nuclei present in the polyester chains relative to the plane of the film.
• the planar orientation of a film is expressed using the planar orientation coefficient in accordance with the expression: in which :
• planar orientation coefficient which can take any value compatible with the achievement of technical objectives.
• through withdrawal rate there is no critical lower value for the through withdrawal rate.
• the polyesters used for obtaining the support films according to the invention are those which are usually used for the preparation of films. These are film-forming linear polyesters, crystallizable by orientation and usually obtained from one or more aromatic dicarboxylic acids or their derivatives (esters of lower aliphatic alcohols, halides for example) and one or more aliphatic glycols . As an example of diacids
• aromatic there may be mentioned phthalic, terephthalic acids,
• these acids can be combined with a minor amount of one or more aliphatic dicarboxylic acids such as adipic acids. azelaic, hexahydroterephthalic.
• aliphatic diols mention may be made of ethylene glycol; propanediol-1,3; 1,4-butanediol. 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 polyterephthalates of alkylenediols and, in particular, polyterephthalates of ethylene glycol (PET) or 1,4-butanediol or copolyesters comprising at least 80 mol% of alkylene glycol terephthalate units.
• PET ethylene glycol
• 1,4-butanediol 1,4-butanediol or copolyesters comprising at least 80 mol% of alkylene glycol terephthalate units.
• the polyester is a polyethylene terephthalate whose intrinsic viscosity measured at 25 ° C. in o-chlorophenol is between 0.6 and 0.75 dl / g.
• the oriented semi-crystalline polyester films in accordance with the present invention can be obtained by conventional film-forming methods.
• the amorphous polyester film resulting from the extrusion is subjected to at least one unidirectional stretching intended to give it a satisfactory set of mechanical properties and preferably to a bidirectional stretching carried out in two orthogonal directions.
• the stretching can be simultaneous or successive.
• the drawing (s) can be carried out in a single or in several stages until the desired drawing ratio is obtained.
• the amorphous film is subjected to a transverse stretching (direction perpendicular to the direction of the machine) the longitudinal stretching which can precede the transverse stretching (so-called normal sequence) or follow it (so-called reverse sequence).
• the longitudinal stretching rate is between 3 and 5 and the temperature between 80 and 120 ° C; transverse stretching is carried out at a rate of 3 to 5 and at a temperature of 90 to 120 ° C.
• the stretched film is then subjected to heat setting at a temperature between 200 and 240 ° C.
• polyester films in accordance with the invention having the characteristics of ⁇ P and of through shrinkage specified above depends on the choice of the filming conditions in the general framework set out above: stretching rates, stretching temperatures thermofixation.
• stretching rates stretching temperatures thermofixation.
• the conditions of temperature, duration and the value of the tension depend on the conditions of filming and must be determined in each particular case in order to achieve the desired shrinkage rate. Since the film relaxation treatment can cause a slight reduction in ⁇ P, the relaxation conditions must also be chosen so as to achieve the best possible compromise between ⁇ P and the shrinkage rate.
• polyester films according to the present invention requires the selection of the stretching conditions
• thermofixation and relaxation taking into account the nature of polyester. It is within the reach of the skilled person to make this selection without him it is necessary to add other information to the above.
• the polyester subjected to filming may contain the usual adjuvants used for obtaining films. They can be fillers, antistatic agents, stabilizers for example.
• the polyester films according to the present invention can be provided on at least one of their faces with a primary coating intended to improve the adhesion of the final application coatings and in particular of polyolefin coatings.
• the primary adhesion coatings can be chosen from those used for this purpose.
• coatings based on acrylic polymers such as those described in French patents no. 1,428,831 and English no. 1,075,533, copolyesters sulfones such as those described in French patents no. 1,401,581 and 1,602,002, American No. 4,476,189, graft copolymers of sulfonated copolyesters and acrylic monomers such as those described in European application EP 0.260.203.
• polyester support films according to the invention are intended for their purposes.
• These primary coatings are deposited on the films according to the invention in the form of aqueous solutions or dispersions or organic solutions, either in line (coating before stretching or between draws) or in recovery (after heat setting).
• aqueous solutions or dispersions or organic solutions either in line (coating before stretching or between draws) or in recovery (after heat setting).
• the improvement of the adhesion properties of the films according to the present invention can also be obtained by treatment of the film surface by means of electric discharges (corona treatment) or by plasma. These treatments can also be combined with the deposition of an adhesion primer such as those mentioned above.
• polyester films according to the present invention are suitable for numerous applications, they are very particularly suitable for obtaining composite films comprising a layer of a film-forming polymer and, in particular of an olefin polymer, on at least one of their face by the extrusion-coating process.
• the present invention has for its second object, composite films constituted by a polyester film, oriented semi-crystalline support comprising on at least one of its faces a coating.
• polyester support film has a planar orientation rate ⁇ P greater than or equal to 165 ⁇ 10 -3 and a transverse shrinkage rate at 200oC less than or equal to 2.7%.
• polyester / polyolefin composite films according to the present invention are obtained by extrusion-coating of a polyolefin polymer on the polyester support film according to the usual methods well known to those skilled in the art. : Kirk-Othmer Encyclopedia of Chemical Technology - vol. 6, page 421-422, 3rd edition; ibidem vol. 10, page 237; Allan R.
• a molten olefin polymer is extruded by a slit die in the form of a sheet brought to a temperature between 280 and 330oC (preferably between 300 and 320oC): this sheet is deposited on the polyester support film according to the invention, optionally preheated to a temperature between 70 and 150 ° C, continuously scrolling near the die.
• the complex thus formed is pressed onto the surface of a metallic cooling drum by means of a pressure roller coated with an elastomer layer, the polyolefin layer being in contact with the cooling drum maintained by any means suitable for temperature low enough to bring the temperature of the polyolefin layer to a value between 40 and 60 ° C.
• the composite film thus obtained can be subjected to a second operation
• extrusion-coating intended to place on the second face of the polyester support another layer of polyolefin polymer.
• the polyester support film Prior to passing through the extrusion-coating zone, the polyester support film is preferably subjected to the usual treatments intended to improve the bond between the polyester film and the polyolefinic coating layers.
• it can be subjected to a corona treatment and / or to the deposition of an adhesion primer and / or of an adhesive layer by the usual coating methods.
• organic solutions can be used (for example, in esters or ketones
• polymers such as polyurethanes
• the coated polyester support film is then dried to evaporate the solvent (s) and, if necessary, preheated.
• the running speed of the polyester support film during extrusion-coating process is generally between 100 and 240 m / min.
• the quantity of olefinic polymer deposited on the face or faces of the support film is calculated so that the thickness of the final coating is between 5 and 40 ⁇ m (preferably between 5 and 30 ⁇ m).
• the thickness of the polyester support film is generally between 5 ⁇ m and 50 ⁇ m and preferably between 8 ⁇ m and 40 ⁇ m.
• the second coating extrusion operation can be carried out immediately after the first or after resting the composite film resulting from the first extrusion operation - sleeping for a period specific to each particular case. In general, it is not necessary for this rest phase to exceed fifteen days.
• the olefin polymers which can be used to obtain the composite films according to the invention are those usually used for the manufacture of composite films with polyester support intended for packaging. These are essentially polymers and copolymers derived from oc-olefins and in particular polymers and copolymers of ethylene and propylene high or low density. It would also be possible, without departing from the scope of the present invention, to use polyionomers constituted by polymers of ethylene having metal carboxylate groups such as those sold under the trademark SURLYN A.
• Circular test specimens with a diameter of 100 mm are cut from a polyester film after identification of the directions of the transverse stretching and of the longitudinal stretching of the film. The test pieces are then brought to 200 ° C for 30 minutes in a thermostated ventilated oven. After
• the diameters of the test pieces are determined in the transverse direction (DT) and in the longitudinal direction (DL) by means of a measuring block constituted by a measuring scale graduated by 0.1 min engraved on a glass plate lit and by a telescopic sight.
• the withdrawal is expressed and calculated using the formulas:
• the delamination force is expressed in g / cm.
• the amorphous film is cooled to 30 ° C on a cooling drum and then stretched first in the longitudinal direction at a rate from 3.5% at 110 ° C, then in the transverse direction at a rate of 4.05 and at a temperature ranging from 115 ° C (start of stretching) to 120 ° C (end of stretching).
• the bi-stretched film is then subjected to heat setting in an oven, the three zones of which are brought respectively to 200 ° C, 230 ° C and 235 ° C; the duration of the heat treatment being a total of 3 seconds; then to a transverse relaxation causing a total decrease in its width by 3%. This relaxation was achieved in 2 seconds when the film cooled.
• a PET film is obtained in this way with a speed of 190 m / min having the following characteristics:
• the single-layer composite film thus obtained is wound after cutting the edges and then stored at 20 ° C for 5 days to allow the adhesive to set.
• the other the composite film face is then subjected to a second extrusion-coating phase under the same conditions, in this way a PE / PET / PE composite film is obtained in which the PE layers have a thickness of 25 ⁇ m.
• the FE / PET / PE composite films obtained as above have an average delamination force on the second face of 100 g / cm and a fluctuation of ⁇ 50% of this value on either side of the average value.
• PET films were prepared by operating as in Example 1 under the conditions indicated in the following table, then films

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Manufacturing & Machinery (AREA)
• Polymers & Plastics (AREA)
• Organic Chemistry (AREA)
• Health & Medical Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Medicinal Chemistry (AREA)
• Materials Engineering (AREA)
• Mechanical Engineering (AREA)
• Laminated Bodies (AREA)
• Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
• Manufacture Of Macromolecular Shaped Articles (AREA)
• Extrusion Moulding Of Plastics Or The Like (AREA)
• Materials For Medical Uses (AREA)
• Medicinal Preparation (AREA)
• Polyesters Or Polycarbonates (AREA)

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• 1988
  • 1988-12-28 FR FR8817561A patent/FR2640984B1/fr not_active Expired - Fee Related
• 1989
  • 1989-12-27 WO PCT/FR1989/000683 patent/WO1990007543A1/fr not_active Application Discontinuation
  • 1989-12-27 EP EP90900884A patent/EP0451180A1/fr active Pending
  • 1989-12-27 DE DE68914132T patent/DE68914132T2/de not_active Expired - Lifetime
  • 1989-12-27 ES ES89420522T patent/ES2050271T3/es not_active Expired - Lifetime
  • 1989-12-27 US US07/720,466 patent/US5242757A/en not_active Expired - Lifetime
  • 1989-12-27 FI FI913130A patent/FI913130A7/fi not_active Application Discontinuation
  • 1989-12-27 CA CA002006694A patent/CA2006694C/fr not_active Expired - Fee Related
  • 1989-12-27 PT PT92738A patent/PT92738B/pt active IP Right Grant
  • 1989-12-27 EP EP89420522A patent/EP0378955B1/fr not_active Expired - Lifetime
  • 1989-12-27 AT AT89420522T patent/ATE103308T1/de not_active IP Right Cessation
  • 1989-12-28 IE IE420289A patent/IE62996B1/en not_active IP Right Cessation
• 1991
  • 1991-06-25 DK DK199101236A patent/DK174396B1/da not_active IP Right Cessation

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