CA2287898A1 - Metallizable bopp film with an outer polyketone layer - Google Patents

Metallizable bopp film with an outer polyketone layer Download PDF

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Publication number
CA2287898A1
CA2287898A1 CA002287898A CA2287898A CA2287898A1 CA 2287898 A1 CA2287898 A1 CA 2287898A1 CA 002287898 A CA002287898 A CA 002287898A CA 2287898 A CA2287898 A CA 2287898A CA 2287898 A1 CA2287898 A1 CA 2287898A1
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Prior art keywords
layer
composite film
film according
acid
ethylene
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CA002287898A
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French (fr)
Inventor
Bernd Sperlich
Rainer Brandt
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Dow Produktions und Vertriebs GmbH and Co oHG
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Individual
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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
    • 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
    • B32B27/16—Layered products comprising a layer of synthetic resin specially treated, e.g. irradiated
    • 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
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
    • 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
    • B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
    • B32B27/281—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42 comprising polyimides
    • 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
    • B32B27/308—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (co)polymers
    • 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
    • B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
    • 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
    • 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
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/0008—Electrical discharge treatment, e.g. corona, plasma treatment; wave energy or particle radiation
    • 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
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J123/00—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers
    • C09J123/02—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers not modified by chemical after-treatment
    • C09J123/04—Homopolymers or copolymers of ethene
    • C09J123/08—Copolymers of ethene
    • 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
    • B32B2255/00—Coating on the layer surface
    • B32B2255/10—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber layer
    • 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
    • B32B2255/00—Coating on the layer surface
    • B32B2255/20—Inorganic coating
    • 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
    • B32B2255/00—Coating on the layer surface
    • B32B2255/20—Inorganic coating
    • B32B2255/205—Metallic coating
    • 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
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/31—Heat sealable
    • 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
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/514—Oriented
    • B32B2307/516—Oriented mono-axially
    • 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
    • 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
    • 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
    • B32B2307/7244—Oxygen barrier
    • 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
    • B32B2307/7246—Water vapor barrier
    • 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
    • B32B2307/7248—Odour barrier
    • 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
    • B32B2310/00—Treatment by energy or chemical effects
    • B32B2310/14—Corona, ionisation, electrical discharge, plasma treatment
    • 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
    • B32B2323/00—Polyalkenes
    • B32B2323/10—Polypropylene
    • 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
    • B32B2439/00—Containers; Receptacles
    • B32B2439/70—Food packaging
    • 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
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/10—Homopolymers or copolymers of propene
    • C08J2323/12—Polypropene

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Laminated Bodies (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

Abstract

The invention relates to a heat-sealable composite film comprising A) a base layer of preferably biaxially stretched polypropylene; B) an adhesionpromoting layer of modified polyolefin on at least one side of base layer (A); C) an outer layer of a copolymer consisting of one or several olefins and carbon monoxide (polyketone) located on the adhesion-promoting layer(s) (B).

Description

., WW 5485-Foreign / Br/Kr/W6/V02.03.1998 F I L E, P.1~.~P1-T H I S ~."~ "~°
T~(i~fRAN9L~ITION
Metatlisable BOPP film having a polyketone outer layer The invention relates to a multilayer, preferably biaxially drawn, heat-sealable polypropylene film (BOPP film) which can be subjected to vapour deposition treatment in vacuo and has a good barrier action against water vapour, oxygen and flavours, and to a process for the production of the film. The characterising features of the film to which the invention relates are a core layer of polypropylene and an outer layer of a copolymer of olefins and carbon monoxide.
Polypropylene films to which metals or metal oxides have been applied by vapour deposition are mostly used, on account of their good barrier properties against water vapour, oxygen, light and flavours, for the packaging of sensitive foodstuffs.
However, in addition to those functional properties, the optics of the film also plays a very large part. Moreover, it must also be possible to process the film on high-1 S speed packaging machines without problems.
Because of the flexibility of polypropylene films subjected to vapour deposition treatment in vacuo, a very high affinity of the metal or metal oxide for the film surface is important, which generally requires the film surface to be subjected to corona pretreatment. In addition, the barner action against water vapour, oxygen and flavours is very definitely dependent on the material of the outer layer to which the metal or metal oxide is applied by vapour deposition.
Accordingly, it has proved necessary to manufacture a BOPP film which can be subjected to vapour deposition treatment in vacuo and which exhibits very good adhesion between the metal or metal oxide and the substrate surface to be subjected to vapour deposition treatment, and which has a markedly higher oxygen barner.
That object is achieved by a heat-sealable composite film composed of A) a base layer of biaxially drawn polypropylene;

WW 5485-Foreign B) an adhesion promoter layer of modified polyolefin on at least one side of the base layer A;
C) an outer layer of a copolymer of one or more olefins and carbon monoxide (polyketone) on the adhesion promoter layers) B.
The layers A and B or B and C can optionally be cbmbined to form one layer by mixing the corresponding polymers.
The preferred feature is that the biaxially drawn, heat-sealable polypropylene film produced by means of a sequential process has an outer layer, which can be subjected to vapour deposition treatment in vacuo, of a copolymer of carbon monoxide and one or more olefinically unsaturated compounds (polyketone).
There come into consideration as olefinically unsaturated compounds in principle all monomers of that class of compounds. Preference is given to ethylene and C3-to C,o-alkenes, such as, for example; propylene, 1-butene, 2-butene, 1-pentene, 1-hexene, 1-octene, 1-nonene, 1-decene. Special preference is given to ethylene and propylene. The outer layer which can be subjected to vapour deposition treatment in vacuo preferably consists of a copolymer of from 25 to 50 mol % ethylene, from 0 to mol % propylene and 50 mol % carbon monoxide, the olefinically unsaturated 20 compounds and the carbon monoxide being incorporated alternately into the copolymer. By replacing some of the ethylene by higher olefins, the melting point falls and the drawability of the copolymer is improved.
There can be applied to the polyketone surface by vapour deposition in vacuo an 25 element, or the oxides of the element, of the first to fourth main or subsidiary groups of the periodic system.
The polypropylene of the base layer A is preferably an isotactic polypropylene having a density of from 0.90 to 0.91 g/cm3 and a melt flow index of from 1 to 4 g/10 min. at 230°C/21.6 N/cm2 pressure (DIN 53 735).

".... ~~, WW 5485-Foreign In order to produce the adhesion promoter layer B, modified polyolefins are used.
These are preferably polyolefins containing carboxyl groups, such as, for example, polypropylene or polyethylene, which contain grafted on at least one monomer from the group of the a,b-monounsaturated dicarboxylic acids, such as, for example, malefic acid, fumaric acid, itaconic acid or their acid anhydrides, acid esteis, acid amides and acid imides, copolymers of ethylene with a,b-monounsaturated carboxylic acids, such as acrylic acid, methacrylic acid and/or their metal salts (Zn, Na) and/or their (Ci-C4)-alkyl esters, or corresponding graft polymers on polyolefins such as polyethylene or polypropylene, or already described saponified mixed polymers, which are graft-polymerised with a monomer of the above-mentioned unsaturated acids.
Special preference is given to polyolefins, such as polypropylene, polyethylene, or copolymers of propylene or ethylene with not more than 1.0 wt.% of grafted-on a,b-monounsaturated dicarboxylic acid anhydride, such as malefic anhydride, or their saponified mixed polymers.
If the adhesion promoter polymer is incorporated either in the sealable layer A or in the gas barrier layer C, up to 40 wt.%, preferably from 25 to 30 wt.%, based on layer-forming polymers, of the modified polyolefin are used for the preparation of the corresponding polymers.
The polypropylene base layer preferably carries on the base layer A a heat-sealable layer, which is located on the opposite side with respect to the polyketone layer C.
The following materials are preferably used for the sealable layer:
- random propylene/ethylene copolymers - random propylene/olefin (1) copolymers - random propylene/ethylene/olefin terpolymers - mixtures of two or three of the above polymers.

~... --.
WW 5485-Foreign Special preference is given to a propylene/ethylene copolymer and a propylene/ethylene/butene terpolymer. The density of the sealing layer polymer is preferably to be in the range of from 0.895 to 0.960 g/cm3 and the crystallite melting point, depending on the type, is to be in the range of from 125 to 148°C.
In order to ensure that biaxially oriented polypropylene films run well on the machine, it is necessary to provide at least the sealing or cover layers with additives, such as lubricants, antiblocking agents and antistatics.
Preferred antistatics are alkali alkanesulfonates, polyether-modified, that is to say ethoxylated and/or propoxylated, polydiorganosiloxanes and/or the substantially straight-chained and saturated aliphatic tertiary amines which contain an aliphatic radical having from 10 to 20 carbon atoms and are substituted by w-hydroxy-(C,-C4)-alkyl groups, there being especially suitable N,N-bis(2-hydroxyethyl)-_ 1 ~ alkylamines having from 10 to 20 carbon atoms, preferably from 12 to 18 carbon atoms, in the alkyl radical. The effective amount of antistatic is in the range of from 0.05 to 0.5 wt.%. In addition, glycerine monostearate is suitable and is used as an antistatic in an amount of from 0.03 to 0.5 wt.%.
Suitable antiblocking agents are inorganic additives, such as silicon dioxide, calcium carbonate, magnesium silicate, aluminium silicate, calcium phosphate and the like, and/or incompatible organic polymers, such as polyamides, polyacrylates, polymethacrylates, polyesters, polycarbonates and the like, with polymethacrylates and silicon dioxide preferably being used. The effective amount of antiblocking agent is in the range of from 0.1 to 2 wt.%, preferably from 0.1 to 0.8 wt.%.
The mean particle size is from 1 to 6 Vim, especially from 2 to 5 pm, particles having a spherical shape being especially suitable.
Lubricants are higher aliphatic acid amides, higher aliphatic acid esters, waxes and metal soaps, as well as polydimethylsiloxanes. The effective amount of lubricant is ,...- .-.
WW 5485-Foreisn in the range of from 0.01 to 3 wt.%, preferably from 0.02 to 1 wt.%. The addition of higher aliphatic acid amides in the range of from 0.01 to 0.25 wt.% is especially suitable. An especially suitable aliphatic acid amide is erucic acid amide.
The addition of polydimethylsiloxanes is preferred in the range of from 0.02 to 2 wt.%, especially polydimethylsiloxanes having a viscosity of from 5000 to 1 000 000 mm2/s.
The films according to the invention can be produced by conventional processes such as lamination, coating or melt co-extrusion. After extrusion and solidification of the thick film on the casting roller, the film is drawn in the direction of movement (longitudinally) with a draw quotient of from 4/1 to 7/1 at a temperature of from 120°C to 150°C. The draw ratio in the transverse direction is preferably from 8/1 to 12/1, and transverse drawing of the film is carried out at a temperature of from 130°C to 170°C. Subsequent heat setting is preferably carned out at from 1 °C to 40°C below the transverse-drawing temperature.

...-- --~., WW 5485-Foreign Example In order to produce a 4-layer film, an alternating copolymer of ethylene and carbon monoxide (polyketone) (m.p.: 220°C, volume flow index: 6 ml/10 min. at 240°C/2.16 kg) was co-extruded with a modified polypropylene of a saponified mixed polymer of 0.7 wt.% of grafted-on malefic anhydride and having a melt index of S g/10 min. at 250°C/21.6 N/cm2 for the adhesion promoter layer, and was bonded by conventional processes with the base film of polypropylene having a density of 0.905 g/cm3, a melt index of 3 g/10 min. (230°C/21.6 N/m2) and a softening range of from 160 to 166°C, and was drawn, the base layer having on the other side with respect to the polyketone a co-extruded, heat-sealable layer of a propylene/ethylene/butene terpolymer containing 2500 ppm of silicon dioxide as the antiblocking agent. In that manner, a composite film having longitudinal drawing in a ratio of 5:1 and transverse drawing in a ratio of 10:1 was obtained.
The total film thickness was 20 pm. The layer thickness of the polyketone, of the adhesion promoter and of the terpolymer was in each case 1 pm. The film was metallised in vacuo on the polyketone side with aluminium. The water vapour permeability of the metallised film was 0.27 g/m2d at 38°C and 90 %
relative humidity. The oxygen permeability of the metallised film was 3 cm3/m2d bar.
Measuring methods Determination of water vapour permeability~WVP1 The water vapour permeability was determined according to DIN 53122, Part 2, at 38°C and 90 % relative humidity.
Determination of ox~rgen permeability (02-P
The oxygen permeability was determined according to DIN 53380, Part 3, at 23°C
and 0 % relative humidity.

Claims (13)

claims
1. Heat-sealable composite film composed of A) a base layer of preferably biaxially drawn polypropylene;
B) an adhesion promoter layer of modified polyolefin on at least one side of the base layer A;
C) an outer layer of a copolymer which consists of one or more olefins and carbon monoxide (polyketone) and is located on the adhesion promoter layer(s) B.
2. Composite film according to claim 1, characterised in that the layers A and B
or B and C are combined to form one layer by mixing the corresponding polymers.
3. Composite film according to at least one of the preceding claims, characterised in that the carbon monoxide and the olefin(s) are incorporated in the terpolymer of the outer layer C in an alternating sequence.
4. Composite film according to claim 3, characterised in that the terpolymer consists of 50 mol % carbon monoxide, from 25 to 45 mol % ethylene and from 5 to 25 mol % propylene.
5. Composite film according to at least one of the preceding claims, characterised in that the outer layer C consists of a terpolymer of carbon monoxide, ethylene and propylene.
6. Composite film according to claim 1, characterised in that layer B consists of a homo- or co-polymer of propylene or ethylene with grafted-on units of malefic acid, fumaric acid, itaconic acid or their acid anhydrides, acid esters, acid amides and acid imides, or copolymers of ethylene with acrylic acid, methacrylic acid and/or their metal salts and/or their (C1-C4)-alkyl esters, or corresponding graft polymers.
7. Composite film according to at least one of the preceding claims, characterised in that a heat-sealable layer is located on the base layer A.
8. Composite film according to claim 6, characterised in that the heat-sealable layer is a propylene/ethylene copolymer or a propylene/ethylene/butene terpolymer.
9. Composite film according to at least one of the preceding claims, characterised in that at least the sealing or cover layers are provided with additives, such as lubricants, antiblocking agents and antistatics.
10. Composite film according to at least one of the preceding claims, characterised in that its outer layer C is flame- or plasma- or corona-pretreated.
11. Composite film according to at least one of the preceding claims, characterised in that there is applied to the outer layer C by vapour deposition in vacuo an element, or the oxides of the element, of the first to fourth main or subsidiary groups of the periodic system.
12. Composite film according to at least one of the preceding claims, characterised in that the layer combination is produced by lamination or melt extrusion.
13. Use of the film according to at least one of the preceding claims as a solo film or a composite film component for packaging purposes.
CA002287898A 1997-04-30 1998-04-21 Metallizable bopp film with an outer polyketone layer Abandoned CA2287898A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19718192A DE19718192A1 (en) 1997-04-30 1997-04-30 Metallizable BOPP film with polyketone outer layer
DE19718192.9 1997-04-30
PCT/EP1998/002349 WO1998049007A1 (en) 1997-04-30 1998-04-21 Metallizable bopp film with an outer polyketone layer

Publications (1)

Publication Number Publication Date
CA2287898A1 true CA2287898A1 (en) 1998-11-05

Family

ID=7828169

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002287898A Abandoned CA2287898A1 (en) 1997-04-30 1998-04-21 Metallizable bopp film with an outer polyketone layer

Country Status (6)

Country Link
EP (1) EP0977664A1 (en)
AU (1) AU7336198A (en)
BR (1) BR9809371A (en)
CA (1) CA2287898A1 (en)
DE (1) DE19718192A1 (en)
WO (1) WO1998049007A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE50208425D1 (en) * 2001-08-01 2006-11-23 Treofan Germany Gmbh & Co Kg TRANSPARENT BIAXIALLY ORIENTED POLYOLEFIN FILM WITH IMPROVED SEAL PROPERTIES
DE102009037022B4 (en) 2009-08-07 2014-03-20 Carl Zeiss Meditec Ag Surgical microscope and method for pivoting a co-observer microscope

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5763101A (en) * 1995-03-31 1998-06-09 Kuraray Co., Ltd. Polyalcohol film and laminated film comprising the same

Also Published As

Publication number Publication date
DE19718192A1 (en) 1998-11-05
AU7336198A (en) 1998-11-24
BR9809371A (en) 2000-07-04
EP0977664A1 (en) 2000-02-09
WO1998049007A1 (en) 1998-11-05

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FZDE Discontinued