DE102008051399A1 - Foil, useful e.g. as packing foil, comprises a layer containing a mixture of first cyclo-olefin copolymer and second cyclo-olefin copolymer, where both the copolymers have specific glass transition temperature and tear elongation - Google Patents

Abstract

Foil comprises either at least one layer containing a mixture of at least one first cyclo-olefin copolymer with a glass transition temperature of at least 65[deg] C and a tear elongation of less than 10%, determined according to ISO 527, and at least one second cyclo-olefin copolymer with a glass transition temperature of 25-35, according to ISO 527 and a tear elongation of at least 50%, determined according to ISO 527, or at least two layers, where the first layer contains the first cyclo-olefin copolymer and the second layer contains the second cyclo-olefin copolymer.

Description

The The present invention relates to films containing selected ones Combinations of cycloolefin copolymers, posing as packaging films suitable, in particular as twist wrapping.

The excellent suitability of cycloolefin copolymers for the preparation of films is known per se. Such slides are already have been proposed for the production of twist wrap packaging.

EP 0 920 989 A2 describes laminates of several polyolefin layers which, in addition to a cycloolefin copolymer layer, comprise a layer of a blend of selected polypropylene / polyethylene polymers. The laminates have a high adhesion of the individual layers to one another and are outstandingly suitable for vacuum deformation, for example in the production of blister packs or blister packs.

DE 20 2006 001 454 U1 describes polymer films of cycloolefin copolymers stretched up to 50% in the machine direction. Combinations of such films with films of other polymeric materials are also described. These films are suitable, among other things, as tubular packaging or as twist wrapping packaging.

EP 0 649 737 A1 describes multi-layer laminates made of polyolefinic materials. A layer A) of these laminates consists of a polymer derived from cyclic olefins and another layer B) of these laminates consists of a polyolefin, preferably a polyethylene or a polypropylene; but this additional layer may also consist of copolymers derived from non-cyclic olefins as monomers and from cyclic olefins as monomers. The laminates are excellently suited as packaging films, among other things as blister packs or as containers for a wide variety of ingredients.

EP 0 773 102 A1 describes multi-layer laminates that are suitable as packaging films. The laminates contain a layer of cycloolefin copolymers and another low oxygen permeability polymer layer.

The Properties of films based on cycloolefin copolymers can be selected by selecting individual components and specific processing conditions set specifically.

So revealed DE 197 25 975 A1 a blister pack, in the production of which a mono- or multilayer film with at least one layer of cycloolefin copolymer or a mixture thereof with other thermoplastics is used. The mono- or multi-layer film has a low water vapor permeation and a comparatively low puncture resistance of less than 300 N / mm thickness.

DE 196 44 675 A1 describes similar blister packs in which at least the cover film and / or the bottom film contains a monolayer or multi-layer film of cycloolefin copolymer. Again, the mono- or multi-layer films have comparatively low puncture resistance.

DE 102 42 730 A1 describes thermoformable films with high heat resistance and water vapor barrier. Here, cycloolefin copolymers are used which have a glass transition temperature of at least 65 ° C.

There have also been described mixtures of cycloolefin copolymers with other polymers, including with different cycloolefin copolymers. For example, disclosed WO 2006/042681 A1 Polymer blends containing cycloolefin copolymer and a small amount of polyethylene for the production of films with a reduced defect number. Out EP 0 844 077 A2 Biaxially oriented multilayer films of cycloolefin copolymers are known. These films contain a base layer of a cycloolefin copolymer and a cover layer of a mixture of two cycloolefin copolymers having different glass transition temperatures. These films are proposed for use in capacitors. In addition to a good slip behavior, these have low electrical loss factors. Specifically disclosed are mixtures of cycloolefin copolymers, each having high glass transition temperatures of at least 140 ° C.

The particular suitability of cycloolefin copolymers as a component of Dreheinschlagsverpa It is also already known. For this purpose, particularly suitable packaging materials describe the EP 1 661 693 A1 and the EP 1 714 779 A1 ,

The particular suitability of cycloolefin copolymers as a component of Twist wrap packaging is due to the good twist ability of this material. This has the consequence that a once turned film maintains its condition after twisting and that itself form virtually no restoring forces, which the twisted foil would turn up again. Further are Cycloolefin copolymers good cut. However, these materials are relatively brittle, especially when used in high-speed Packaging machines for puncturing the packaging by lead the packaged goods and thus a break can cause production.

Surprisingly Now a combination of materials was found, which is a good one Compromise between the opposing properties good Twistability and good puncture resistance guaranteed. These are foils containing a combination of selected ones Types of cycloolefin copolymers.

task The present invention therefore provides the provision of films with good twistability and at the same time good puncture resistance. These films are characterized by a high damage work made, so are compared to mechanical loads especially resistant. In addition, these films have a low Creep module and thus no or little restoring forces when deformed, which is for their use as twist wrapping is advantageous.

The present invention relates in a first embodiment to a film comprising at least one layer of a mixture of at least one first cycloolefin copolymer having a glass transition temperature of at least 65 ° C and an elongation at break, determined according to ISO 527 , of less than 10% and of at least one second cycloolefin copolymer having a glass transition temperature between 25 and 35 ° C and an elongation at break, determined according to ISO 527 , of at least 50%.

The The present invention relates in a second embodiment a film containing at least two layers, wherein a first Layer at least a first cycloolefin copolymer according to the above given definition and a second layer at least one second cycloolefin copolymer according to the above given definition.

The Films according to the invention are thus characterized by a Combination of at least two cycloolefin copolymers characterized wherein the first cycloolefin copolymer is a low elongation at break type and the second cycloolefin copolymer is a high elongation at break type is. The combination according to the invention can be found in Form of mixtures of cycloolefin copolymers can be used or as a combination of films of the different cycloolefin copolymers.

Of the Proportion of first and second cycloolefin copolymers in the inventive Films can vary widely, for example, the Proportion of the first cycloolefin copolymer 20 to 80% by weight, preferably 30 to 70 wt.% Be and the proportion of the second cyclolefin copolymer may be 80 to 20% by weight, preferably 70 to 30% by weight; there the percentages refer to the sum of the shares of the former and second cycloolefin copolymer.

advantageously, contain the films of the invention in addition to the Layer or the layers of cycloolefin copolymers still layers from further polymers, preferably from polyolefins, in particular polyethylene and / or polypropylene. Alternatively or in addition The layers can be made from cycloolefin copolymers or from Mixtures of cycloolefin copolymers, other polymers, preferably polyolefins contain, in particular polyethylene and / or polypropylene. The amount the other polymers in such layers - if any present - is usually less as 40% by weight of the layer.

Next the polymer components can the inventive Foils contain further conventional additives, which serve as a processing aid or the film a specific Lend property. For multilayer films can these additives in one or more layers or even be included in all layers. The proportion of these additives is usually not more than 10% by weight, preferably not more than 5% by weight, based on the total mass the foil.

Examples for such additives are pigments, dyes, Antistatic agents, lubricants, antiblocking agents, plasticizers, surfactants, Pore formers, fillers, preservatives and / or Processing aids.

• A) mindestens eine Schicht aus einer Mischung enthaltend das erste Cycloolefin-Copolymer und das zweite Cycloolefin-Copolymer, und
• B) mindestens eine Schicht aus einem Polyolefin, das sich von den Cycloolefin-Copolymeren der Schicht A) unterscheidet.

In a preferred embodiment of the first embodiment of the invention, the film contains

• A) at least one layer of a mixture containing the first cycloolefin copolymer and the second cycloolefin copolymer, and
• B) at least one layer of a polyolefin which is different from the cycloolefin copolymers of layer A).

• A') mindestens eine Schicht enthaltend das erste Cycloolefin- Copolymer,
• A'') mindestens eine Schicht enthaltend das zweite Cycloolefin-Copolymer, und gegebenenfalls
• B) mindestens eine Schicht aus einem Polyolefin, das sich von den Cycloolefin-Copolymeren der Schichten A') und A'') unterscheidet.

In a preferred embodiment of the second embodiment of the invention, the film contains

• A ') at least one layer containing the first cycloolefin copolymer,
• A '') at least one layer containing the second cycloolefin copolymer, and optionally
• B) at least one layer of a polyolefin different from the cycloolefin copolymers of layers A ') and A ").

at the first and second inventively used Cycloolefin copolymers are polymers known per se. These are produced by ring-retaining copolymerization, preferably by copolymerization in the presence of metallocene catalysts. Under these conditions, the cyclic structure of the olefin monomers maintained and incorporated into the resulting polymer chain.

alternative or in addition to the above-mentioned cycloolefin copolymers having preserved cyclic structure of the olefin monomers according to the invention under ring-opening copolymerization manufactured types or derived hydrogenated types used become.

Next the substantially linear cycloolefin copolymers or the under ring-opening copolymerization produced types or the derived hydrogenated types can about it In addition, modified types are used, which subsequently with ethylenically unsaturated, preferably functionalized Monomers, such as unsaturated carboxylic acids, grafted have been.

The Adjustment of the glass transition temperature can be carried out by a person skilled in the art in a conventional manner by selecting the type and amount of cyclic and non-cyclic monomers. Such is for example in the case of norbornene-ethylene copolymers it is known that the glass transition temperature the higher, the higher the proportion of norbornene component in the copolymer. The same applies to combinations other cyclic monomer with non-cyclic monomers.

Under glass transition temperature is in the context of the present description after ISO 11373 to understand the size determined by the differential scanning calorimetry (DSC) method, wherein the heating rate is 10 K / minute.

The elongation at break of the respective cycloolefin copolymer is detected in a manner known per se on the injection-molded tensile bar ISO 527 determined. The elongation at break can be influenced to some extent by the choice of the type and amount of the respective monomers; In addition, the type of catalyst used may play a role. In the selection of the cycloolefin copolymers to be used according to the invention, it must be determined on a case-by-case basis whether or not they have the required elongation at break.

worin
n 0 oder 1 bedeutet,
m für 0 oder eine positive ganze Zahl ist,
R¹, R², R³, R⁴, R⁵, R⁶ unabhängig voneinander Wasserstoff, Halogen, Alkylgruppen, Cycloalkylgruppen, Arylgruppen und Alkoxygruppen bedeuten,
R⁷, R⁸, R⁹, R¹⁰, R¹¹, R¹², R¹³, R¹⁴, R¹⁵, R¹⁶ unabhängig voneinander Wasserstoff und Alkylgruppen bedeuten,
R¹⁷, R¹⁸, R¹⁹, R²⁰ unabhängig voneinander Wasserstoff, Halogen und Alkylgruppen bedeuten,
wobei R¹⁷ und R¹⁹ auch aneinander gebunden sein können, derart daß sie einen einfachen Ring oder ein Ringsystem mit mehreren Ringen bilden, wobei der Ring oder die Ringe gesättigt oder ungesättigt sein können,

worin R²¹ und R²² unabhängig voneinander Wasserstoff und Alkylgruppen bedeuten.In a preferred embodiment, the first cycloolefin copolymer and the second cycloolefin copolymer are derived from ring-retaining copolymerization of at least one cycloolefin of the general formula (I) with at least one 1-olefin of the formula (II)

wherein
n is 0 or 1,
m is 0 or a positive integer,
R ¹ , R ² , R ³ , R ⁴ , R ⁵ , R ⁶ independently of one another are hydrogen, halogen, alkyl groups, cycloalkyl groups, aryl groups and alkoxy groups,
R ⁷ , R ⁸ , R ⁹ , R ¹⁰ , R ¹¹ , R ¹² , R ¹³ , R ¹⁴ , R ¹⁵ , R ¹⁶ independently of one another denote hydrogen and alkyl groups,
R ¹⁷ , R ¹⁸ , R ¹⁹ , R ²⁰ independently of one another denote hydrogen, halogen and alkyl groups,
wherein R ¹⁷ and R ^{19 may} also be bonded together to form a single ring or a multi-ring ring system, which ring or rings may be saturated or unsaturated,

wherein R ²¹ and R ^{22 are} independently hydrogen and alkyl groups.

In a particularly preferred embodiment, cycloolefin copolymers derived from compounds of formulas I and II are used wherein n and m are 0 and R ²¹ and R ^{22 are} both hydrogen or R ^{21 is} hydrogen and R ^{22 is} an alkyl group of one to eight carbon atoms ,

In a most preferred embodiment Cycloolefin copolymers derived from compounds of the formulas I and II, wherein the compound of formula I is norbornene and the compound of formula II is ethylene and / or propylene and wherein the copolymerization in the presence of a metallocene catalyst he follows.

The Selection of the first copolymer is carried out as defined above Criteria of glass transition temperature and tear strength.

Preferred types of cycloolefin copolymers are in the DE 102 42 730 A1 described. Very particular preference is given to using the types ^Topas® 8007 and ^Topas® 6013 (Topas Advanced Polymers GmbH, Frankfurt am Main) as the first cycloolefin copolymer.

The Selection of the second copolymer is carried out as defined above Criteria of glass transition temperature and tear strength.

Preferably employed as a second cyclic olefin copolymer, a type number Topas ^® 9506X1 (Topas Advanced Polymers GmbH, Frankfurt am Main).

The Preparation of the copolymers used according to the invention occurs under ring-holding polymerization, d. H. the bi- or remain polycyclic structure of the monomer units used obtained during the polymerization. Examples of catalysts are titanocene, zirconocene or hafnocene catalysts, which in usually used in combination with aluminoxanes as cocatalysts become. This method of production has already been described many times, For example, in the patent documents mentioned above.

Prefers are films of the types defined above, in which a first cycloolefin copolymer is used, the glass transition temperature 60 to 120 ° C is.

Also Films of the types defined above with layers are preferred B) of polyolefin or mixtures of polyolefin, wherein the polyolefin in layer B) is polyethylene and / or polypropylene, preferably LDPE and LLDPE.

Also preferred are films of the types defined above with layers A) or A ') and A''), in addition to the cycloolefin copolymer (mixture) up to 40 wt.%, Preferably up to 20 wt.% Of polyethylene and or polypropylene, preferably LDPE and LLDPE. Films of mixtures of cycloolefin copolymer and polyolefins are known from US-A-2004/0067382 A1 known.

The Films according to the invention can consist of a Layer or consist of several layers of any combination, as long as the criteria defined above are met.

Prefers If the films according to the invention consist of at least three layers, these having the layer sequence A / B / A or B / A / B.

Especially preferred variants thereof are three- or five-layered Foils with the layer sequence A / B / A or B / A / B or A / B / A / B / A or B / A / B / A / B.

In Another preferred variant consists of the invention Films of at least three layers, these being the sequence of layers A '/ A' '/ A' or A '/ A' '/ B or A' '/ A' / B have.

Especially preferred variants thereof are three- or five-layered Films with the layer sequence A '/ A' '/ A' or A '' / A '/ A' 'or A' '/ A' / B or A '/ A' '/ B or A' / B / A '' or A '/ A' '/ A' / A '' / A 'or A' '/ A' / A '' / A '/ A '' or A "/ A" / B / A '/ A "or A' / A" / B / A "/ A 'or A' / B / A" / B / A 'or A '' / B / A '/ B / A' 'or B / A' / B / A '' / B.

In a further preferred embodiment of the invention Films are selected first and second cycloolefin copolymer so that the difference in glass transition temperatures between the first cycloolefin copolymer and the second cycloolefin copolymer not more than 70 ° C, preferably not more than 50 ° C, is.

In Another preferred embodiment relates to Invention multilayer films, of which at least one of the outer Layers containing the second cyclo-olefin copolymer. These Films are due to the comparatively low glass transition temperature at least one of the outer layers at comparatively low temperatures very good sealable (= low sealing response temperatures). Of Further, these films are characterized by an elevated Hot-tack as well as a surprisingly high rigidity.

In a further preferred embodiment, the invention relates to films with a transparency, measured according to DIN EN ISO 2813 , of at least 95%.

In Another preferred embodiment relates to Invention multilayer films in which at least one of the outer Layers containing a cycloolefin copolymer and in which this outer layer is coated with metal.

The Films of the invention can be characterized by produce known molding processes, for example by Blow molding or by extrusion.

The Films can after shaping in per se known One way or monoaxially monoaxially or biaxially stretched and then relaxed. This can be done improve the mechanical properties, such as strength.

One great advantage of the invention Slides, however, are that they are used undressed can. This allows elaborate post-treatment steps save and make the production particularly economical.

The Films of the invention can be in all Use applications in which films typically used are. Examples are laminating films, sealing films, Lid films, thermoforming films, blister films, bag films, films for form-fill-seal or flow-wrap packaging.

The Films of the invention are preferably as optical films, as blister films or as other packaging films for use.

Especially the films according to the invention are preferred used as packaging films, most preferably as Dreheinschlägeverpackungen.

These Uses are also the subject of the present invention.

The The following examples illustrate the invention. A limit this is not intended.

Examples Inventive films were used as multilayer films produced in the thickness of 30 microns on a flat film system. As a comparison, known film structures were prepared and used.

The puncture resistance of the films diminished in the dynamic puncture test DIN 53373 checked. As a measure of the comparison of puncture resistance, the damage work Ws [Joule].

Layer thicknesses are given in brackets (x) means x μm thickness. Materials: COC1 TOPAS 8007F-04 (Elongation at break <10%, T _g 80 ° C) COC2 TOPAS 9506X1 (Elongation at break> 100%, T _g 33 ° C) COC12 Mixture 70% COC1 with 30% COC2 COC1 ' COC with T _g 95 ° C (Elongation at break <10%, T _g 95 ° C) PE Dowlex 2045 LLDPE, density 0.92 g / cm ³ , Dow PP Pro-FAX SR549 Homo-PP, Lyondell-Basell VLLDPE Affinity 1880G VLLDPE, density 0.902 g / cm ³ Dow Examples 1-4: COC1 in the outer layers, symmetrical construction Comparative Examples = (V) example layer sequence Ws [N] Example 1 (V) COC1 (6) / PE (18) / COC1 (6) 0.10 Example 2 COC1 (3) / COC2 (3) / PE (18) / COC2 (3) / COC1 (3) 0.27 Example 3 (V) COC1 (6) / PP (18) / COC1 (6) 0.11 Example 4 COC1 (3) / COC2 (3) / PP (18) / COC2 (3) / COC1 (3) 0.29

Irrespective of the use of PE or PP in the core layer, films 2 and 4 according to the invention show higher puncture resistances than comparative examples 1 and 3. Examples 5-7: Partially crystalline polyolefins in the outer layers Comparative Examples = (V) example layer sequence Ws [N] Example 5 (V) PP (3) / COC1 (6) / PE (12) / COC1 (6) / PP (3) 0.04 Example 6 (V) PP (3) / COC2 (6) / PE (12) / COC2 (6) / PP (3) 1.21 Example 7 PP (3) / COC12 (6) / PE (12) / COC12 (6) / PP (3) 0.21

example 6 shows in comparison to Example 5 particularly high puncture resistance. Due to the low glass transition temperature of COC2, that was used here alone. But this foil fulfills not the requirements for preserving the film properties, eg. B. Twist properties at higher temperatures, as to Example can occur on the transport.

In Example 7 of the invention are by Blend of two COC types both the puncture resistance as well as the service temperature improved.

Examples 8-10: Asymmetric Film construction with COC2 in an outer layer Comparative examples = (V)

at In the above Examples 2 and 4, the COC type was high in elongation at break and low glass stage used in an inner layer. This is advantageous when heat resistance the film is required.

however is also the reverse construction with the COC type high elongation at break and low glass stage in the outer layer possible. These examples show further interesting properties according to the invention Films.

The Use of a COC.Type with low glass layer in the outer layer allows the films to be sealed at low temperatures with high hot-tack. This property is often beneficial when high cycle rates are required in a packaging process. Inventive films with this COC type in the outer layer show over films with known Sealing layers, z. B. from VLLDPE, surprisingly improved Stiffness, lower seal response temperatures (seal initiation = SIT) and increased hottack.

Sealing temperatures and hot tack of the films were determined on the following examples using a Davinor tester. A sealing time of 1 second and a sealing pressure of 0.3 bar were used. The method was in T. Kunststoffe International, Vol. 09/2008, Walcher, W. Goerlitz, Elends with Controllable Peel, Page 77ff. described. example layer sequence SIT hot tack Sealant layer / core layer / outer layer Example 8 COC2 (6) / PE (18) / COC1 '(6) 80 ° C 10 N / 25 mm Example 9 COC12 (6) / PE (18) / COC1 '(6) 85 ° C 12 N / 25 mm Example 10 (V) VLLDPE (6) / PE + COC1 (18) / PE (6) 105 ° C 5 N / 25 mm

According to the invention Examples 8 and 9, Example 10 is for comparison.

definitions:

• SIT = seal initiation temperature; this corresponds to the Minimum of the sealing temperature at which a sealing strength is exceeded by 5 N / 25 mm
• Hot tack: Seal strength determined 0.1 sec after completion the sealing process; Sealing temperature 110-120 ° C; of the given value is an average of several measurements at Sealing temperatures between 110 ° C and 120 ° C carried out were.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - EP 0920989 A2 [0003]
• - DE 202006001454 U1 [0004]
• - EP 0649737 A1 [0005]
• EP 0773102 A1 [0006]
• DE 19725975 A1 [0008]
• - DE 19644675 A1 [0009]
• - DE 10242730 A1 [0010, 0035]
• WO 2006/042681 A1 [0011]
• - EP 0844077 A2 [0011]
• - EP 1661693 A1 [0012]
• - EP 1714779 A1 [0012]
• US 2004/0067382 A1 [0041]

Cited non-patent literature

• - ISO 527 [0016]
• - ISO 527 [0016]
• - ISO 11373 [0029]
• - ISO 527 [0030]
• - DIN EN ISO 2813 [0049]
• - DIN 53373 [0060]
• - T. Kunststoffe International, Vol. 09/2008, Walcher, W. Goerlitz, Elends with Controllable Peel, Page 77ff. [0068]

Claims (21)

Foil containing at least one layer a mixture of at least one first cycloolefin copolymer with a glass transition temperature of at least 65 ° C and an elongation at break, determined according to ISO 527, of less as 10% and from at least one second cycloolefin copolymer with a glass transition temperature between 25 and 35 ° C and an elongation at break, determined according to ISO 527, of at least 50% or containing at least two layers, wherein a first layer contains at least the first cycloolefin copolymer and a second layer at least the second cycloolefin copolymer contains. Foil according to claim 1, characterized in that these A) containing at least one layer of a mixture the first cycloolefin copolymer and the second cycloolefin copolymer, and B) at least one layer of a polyolefin which is from the cycloolefin copolymers of layer A). Foil according to claim 1, characterized in that these A ') at least one layer containing the first cycloolefin copolymer, A '') at least one layer containing the second cycloolefin copolymer, and optionally B) at least one layer of a polyolefin, derived from the cycloolefin copolymers of layers A ') and A ") differs, contains. A film according to any one of claims 1 to 3, characterized in that the first cycloolefin copolymer and the second cycloolefin copolymer are derived from ring-retaining copolymerization of at least one cycloolefin of the general formula (I)

wherein n is 0 or 1, m is 0 or a positive integer, R ¹ , R ² , R ³ , R ⁴ , R ⁵ , R ⁶ independently of one another are hydrogen, halogen, alkyl groups, cycloalkyl groups, aryl groups and alkoxy groups, R ⁷ , R ⁸ , R ⁹ , R ¹⁰ , R ¹¹ , R ¹² , R ¹³ , R ¹⁴ , R ¹⁵ , R ¹⁶ independently of one another denote hydrogen and alkyl groups, R ¹⁷ , R ¹⁸ , R ¹⁹ , R ²⁰ independently of one another hydrogen, Halogen and alkyl groups, wherein R ¹⁷ and R ^{19 may} also be bonded to each other so as to form a simple ring or a ring system having multiple rings, which ring or rings may be saturated or unsaturated, with at least one 1-olefin of Formula (II)

wherein R ²¹ and R ^{22 are} independently hydrogen and alkyl groups. A film according to claim 4, characterized in that n and m are 0 and that R ²¹ and R ^{22 are} both hydrogen or that R ^{21 is} hydrogen and that R ^{22 is} an alkyl group having one to eight carbon atoms. A film according to claim 4, characterized in that the compound of formula I is norbornene and in that the compound of the formula II is ethylene and / or propylene and in that the copolymerization takes place in the presence of a metallocene catalyst. A film according to any one of claims 1 to 6, characterized in that the glass transition temperature of first cycloolefin copolymer is 60 to 120 ° C. A film according to any one of claims 2 to 3, characterized in that the polyolefin in the layer B) polyethylene and / or polypropylene, preferably LDPE and LLDPE. A film according to any one of claims 2 to 3, characterized in that the layers A) or A ') and / or A ''), besides the cycloolefin copolymer or the mixture of cycloolefin copolymers still up to 40% by weight, preferably up to 20% by weight, of polyethylene and / or polypropylene, preferably LDPE and LLDPE. Foil according to claim 2, characterized in that this consists of at least three layers, these being the sequence of layers A / B / A or B / A / B. Film according to claim 10, characterized in that that this consists of three or five layers, where these are the sequence A / B / A or B / A / B or A / B / A / B / A or B / A / B / A / B having. Foil according to claim 3, characterized in that this consists of at least three layers, these being the sequence of layers A '/ A' '/ A' or A '/ A' '/ B or A' '/ A' / B have. Film according to claim 12, characterized in that that this consists of three or five layers, where these the layer sequence A '/ A' '/ A' or A '' / A '/ A' 'or A' '/ A' / B or A '/ A' '/ B or A' / B / A '' or A '/ A' '/ A' / A '' / A 'or A' '/ A' / A '' / A '/ A '' or A "/ A" / B / A '/ A "or A' / A" / B / A "/ A 'or A' / B / A" / B / A 'or A '' / B / A '/ B / A' 'or B / A' / B / A '' / B. A film according to any one of claims 1 to 13, characterized in that the difference of the glass transition temperatures between the first cycloolefin copolymer and the second cycloolefin copolymer not more than 70 ° C, preferably not more than 50 ° C is. A film according to any one of claims 1 to 14, characterized in that it is a multilayer film and that at least one of the outer layers that second cycloolefin copolymer contains. A film according to any one of claims 1 to 15, characterized in that it has a transparency, measured according to DIN EN ISO 2813, of at least 95%. A film according to any one of claims 1 to 15, characterized in that it is a multilayer film that at least one of the outer layers is a cycloolefin copolymer contains and that this layer is coated with metal. A film according to any one of claims 1 to 16, characterized in that it is not stretched. Use of the film according to one of the claims 1 to 18 as packaging film or as optical films. Use according to claim 19, characterized that the film as a laminating film, sealing film, lid film, thermoforming film, Blister foil, bag foil, foil for form-fill-seal or is used as a flow wrap packaging. Use according to claim 19, characterized that the film is used as a twist wrapping.