EP2834068A1

EP2834068A1 - A synthetic film primarily consisting of biodegradable polymers

Info

Publication number: EP2834068A1
Application number: EP13712689.2A
Authority: EP
Inventors: Karl Mauser; Kurt Stark; Christian Schütz
Original assignee: Huhtamaki Films Germany GmbH and Co KG
Current assignee: Loparex Germany GmbH and Co KG
Priority date: 2012-04-02
Filing date: 2013-03-25
Publication date: 2015-02-11
Also published as: WO2013149709A1; DE102012006598A1; US20150072094A1

Abstract

The present invention relates to a single- or multi-layered synthetic film primarily consisting of biodegradable polymers, said synthetic film consisting of one or more layers (a) of at least one biodegradable polymer and 1-35% by weight, relative to the total weight of the layer (a), of at least one modified, thermoplastic copolymer of α,β-unsaturated olefins having 2-10 carbon atoms and (meth)acrylic acid and/or at least one (meth)acrylic acid derivative that is grafted, preferably with cyclic anhydride groups and/or carboxyl groups and/or ester groups, said invention further relating to a use of such a synthetic film as packaging material.

Description

A NUMBER OF BIODEGRADABLE POLYMERS

BUILT PLASTIC FOIL

The present invention relates to a predominantly biodegradable polymers constructed, single or multilayer plastic film with a

Tear strength of preferably at least 30N (DIN 53363 trapeze), consisting of at least one preferably inner layer (a) of a mixture of at least one biodegradable polymer and up to a maximum of 35% by weight, based on the total weight of layer (a), at least one modified, thermoplastic copolymer of α, β-unsaturated olefins having 2-10 C atoms and (meth) acrylic acid and / or at least one

(Meth) acrylic acid derivative which is in each case grafted, preferably with cyclic anhydride groups and / or carboxyl groups and / or ester groups, from optionally

at least one plasticizer, and optionally one or more conventional additives and a use of such a plastic film as packaging material.

Plastic films based on biodegradable raw materials are increasingly used as packaging material, especially if this material is not only biodegradable, but can also be obtained from renewable raw materials.

Disadvantageous in these known from the prior art plastic films are often unsuitable mechanical properties, such as too low toughness and insufficient tear propagation resistance.

Furthermore, biodegradable polymers are often incompatible with polymers, especially those derived from fossil fuels such as petroleum, so that improving the mechanical properties of biodegradable polymers or products made therefrom by blending with thermoplastic polymers from fossil fuels is not leads to the desired improved mechanical properties.

CONFIRMATION COPY It is an object of the present invention to provide plastic films made of biodegradable polymers which are significantly improved, inter alia, in their toughness and tear resistance.

This object is achieved by the provision of predominantly biodegradable, single or multilayer plastic films, consisting of

at least one layer (a) composed of a mixture of at least one biodegradable polymer and up to a maximum of 35% by weight, based on the total weight of the layer (a), of at least one modified thermoplastic copolymer of α, β-unsaturated olefins with 2 -10 C atoms and

(Meth) acrylic acid and / or at least one (meth) acrylic acid derivative which is grafted, preferably with cyclic anhydride groups and / or carboxyl groups and / or ester groups, optionally from at least one plasticizer and optionally one or more customary additives;

the remaining possibly present layers of at least one biodegradable polymer, optionally a modified thermoplastic copolymer of α, β-unsaturated olefins having 2-10 C atoms and (meth) acrylic acid and / or at least one (meth) acrylic acid derivative, which may each be grafted, preferably with cyclic anhydride groups and / or carboxyl groups and / or ester groups, optionally at least one plasticizer; and optionally one or more conventional additives exist and

wherein the total content of the modified thermoplastic copolymers on the plastic film at most 15 wt.% Based on the total weight of

Plastic film, amounts and

wherein the plastic films has no adhesive layer.

Preferably, the plastic films according to the invention have a tear strength of at least 30N measured according to DIN 53363 trapezoid in the machine direction at a total thickness of 200 μητι on.

Preferably, the plastic films according to the invention have no further layer with an amount exceeding the stated maximum amount of the modified thermoplastic copolymer component of the layer a). Preferably, the plastic films according to the invention contain no polymers with aromatic units.

For the purposes of the present invention, the term "biodegradable" is understood to mean that a natural, semisynthetic or synthetic polymer can be present in any desired form, e.g. as a layer of a multilayer plastic film under the action of microorganisms and / or enzymes to water,

Carbon dioxide and biomass according to DIN EN 13432 is decomposable and the

Disintegration test in the context of aerobic composting after 12 weeks, a biological degradation of at least 90%, preferably at least 95%, particularly preferably reaches ^ 99%.

According to the preferred embodiment of the plastic films according to the invention, the entire plastic films are predominantly biodegradable, i. in the

Under the method described above, the entire

Plastic films degraded after 12 weeks to more than 50 wt .-%, preferably more than 70 wt .-%, more preferably more than 80 wt .-% degraded.

For the purposes of the present invention, the term "constructed from" is understood to mean that the plastic films or the respective layer of the

Plastic films the component (s) listed under this term as

Main component included, i. to more than 50% by weight of this component (s). Preferably, the plastic films or the respective layer of the plastic films consist essentially of these components, i. preferably more than 70% by weight, more preferably more than 80% by weight, and most preferably up to 100% by weight.

The plastic films according to the invention have at least one layer (a), composed of a mixture of at least one biodegradable

Polymers and up to a maximum of 35 wt.%, Based on the total weight of the layer (a), at least one modified thermoplastic copolymer of α, β-unsaturated olefins having 2-10 C atoms and (meth) acrylic acid and / or at least one (Meth) acrylic acid derivative which is grafted, preferably with cyclic anhydride groups and / or carboxyl groups and / or ester groups, optionally from at least one plasticizer, and optionally one or more conventional additives.

The layer (s) (a) is or are preferably internal layer (s) in multilayer plastic films of the invention, which are preferably at least three layers, preferably each layer being predominantly biodegradable.

In a preferred embodiment of the plastic films according to the invention, the plastic films are at least five-layered, with preferably all layers of the plastic films having at least one biodegradable polymer as the main constituent.

The plastic films according to the invention may have one layer (a) or more, preferably two layers (a). Assign the invention

Plastic films on several layers (a), so they can be the same

Composition or different compositions, wherein the proportion of modified, thermoplastic copolymers not 35 wt.%, Based on the total weight of a layer (a), and the total amount of the modified, thermoplastic copolymers on the multilayer inventive

Plastic film not 15 wt .-% based on the total weight of the plastic film may exceed.

In a preferred embodiment of the plastic films according to the invention, the total proportion of the biodegradable polymers is at least 75% by weight, preferably at least 80% by weight, particularly preferably at least 85% by weight, based on the total weight of the respective plastic film.

In a preferred embodiment, the biodegradable polymer of the plastic films of the present invention is a biodegradable, synthetic polymer. In a further preferred embodiment, at least one biodegradable polymer of the plastic films of the invention is a biodegradable aliphatic polyester.

Preferably, as biodegradable polymers for producing the layer (s) of the plastic films according to the invention, at least one biodegradable polymer selected from the group comprising lactic acid homo- and copolymers, preferably polylactides of D-lactide and L-lactide (PDLLA) or of L-lactide Lactide (PLLA) or D-lactide (PDLA), polyhydroxyalkanoates, cellulose, cellulose derivatives, thermoplastic starch, polyesters of lactones having 4-10 C atoms, preferably polycaprolactones, copolymers of at least 2 monomers of said polymers and mixtures of at least two of the polymers mentioned, are used.

Polycaprolactones and / or polylactides are particularly preferably used according to the invention as biodegradable polyesters.

When the plastic film of the present invention is multi-layered, the biodegradable polymers of the individual layers may be the same or different. In a particularly preferred embodiment, when the

multilayer plastic film according to the invention, the biodegradable polymers of the individual layers of the same kind.

In the terms "lactic acid homopolymer", "lactic acid copolymer",

"Polylactides (PLA)" according to the invention homopolymers or copolymers of

Lactic acid, regardless of whether they were prepared from lactic acid, lactide oligomers or at least one lactide.

Lactides are ring-shaped condensation products of two lactic acid molecules. They can be derived from two D-lactic acid molecules, two L-lactic acid molecules or one D- and one L-lactic acid molecule and are accordingly referred to as D-lactides, L-lactides or D, L-lactides (meso-lactides). Polylactides may preferably be obtained by catalytic ring-opening polymerization of lactides to be obtained. In this case, D-lactides, L-lactides and / or D, L-lactides (meso-lactides) can be used.

Preferably, the layer (s) of the plastic films according to the invention comprise as biodegradable main component at least one polylactide, preferably selected from the group consisting of poly-L-lactides, poly-D-lactides, poly-DL-lactides and isomeric, optionally racemic mixture of a poly-L-lactide and a poly-D-lactide.

In a preferred embodiment of the plastic films according to the invention, the plastic films in at least two layers, preferably in all layers, as biodegradable polymer at least one polylactide, wherein the polylactide component may be the same or different in all layers.

In a further preferred embodiment of the invention

Plastic films have the plastic films in at least two layers of the same polylactide component, layer thickness and optionally composition.

The layer (s) (a) of the plastic films according to the invention contain or contain up to a maximum of 35% by weight, preferably 1-30% by weight, particularly preferably 5-25% by weight, based on the total weight of the respective layer ( a), at least one modified, thermoplastic copolymer of α, β-unsaturated olefins having 2-10 C atoms and (meth) acrylic acid and / or at least one

(Meth) acrylic acid derivative which is grafted, preferably with cyclic anhydride groups and / or carboxyl groups and / or ester groups.

The plastic films according to the invention preferably have, in addition to the layer or layers (a), no layers in which the maximum amount of the modified thermoplastic copolymer component specified for the composition of layer (a) is exceeded.

In a preferred embodiment, the total amount of the modified thermoplastic copolymers of the plastic film according to the invention is at most 10 wt .-%, based on the total weight of the plastic film. Modified thermoplastic copolymers are thermoplastic copolymers of α, β-unsaturated olefins having 2-10 C atoms and (meth) acrylic acid and / or at least one (meth) acrylic acid derivative which is grafted, preferably with carboxyl groups and / or corresponding derivatives such preferably ester and / or anhydride groups, particularly preferably cyclic anhydride groups, in particular maleic anhydride groups used.

Particularly suitable modified thermoplastic copolymers which are useful in the biodegradable plastic films according to the invention, i.a. When the tear propagation-enhancing component is employed, at least one copolymer selected from the group consisting of copolymers of ethylene and methacrylic acid and / or at least one methacrylic acid derivative and / or methacrylate, and copolymers of ethylene and acrylic acid and / or at least one acrylic acid derivative and / or acrylate , each grafted,

preferably with cyclic anhydride groups, preferably

Maleic anhydride groups and / or carboxyl groups and / or ester groups.

Very particular preference is given to copolymers of

Ethylene / methyl methacrylate copolymers or ethylene / methyl acrylate copolymers grafted with maleic anhydride groups.

Each of the layers of the plastic films of the invention may, respectively

independently of one another, be doped with customary additives. Preferably, the usual additives are selected from the group comprising antioxidants,

Antiblocking agents, antifogging agents, antistatic agents, antimicrobial agents, light stabilizers, UV absorbers, UV filters, dyes, color pigments, stabilizers,

preferably heat stabilizers, process stabilizers and UV and / or light stabilizers, preferably based on at least one sterically hindered amine (HALS), process aids, flame retardants and nucleating agents. , Such additives are preferably used if they are biodegradable.

In this case, the proportion of the aforementioned additives - if present in one layer - each 0.01-30 wt .-%, preferably 0.01-20 wt .-%, especially preferably 0.1-5 wt .-%, each based on the total weight of the individual layer, amount.

In a preferred embodiment, one or more layers of the plastic films of the invention contain at least one plasticizer, preferably at least one polymeric plasticizer, most preferably at least one high molecular weight plasticizer, such as at least one polyalkylene oxide having a molecular weight of 20,000, preferably 25,000 g / mol.

In a preferred embodiment of the plastic films according to the invention, the plastic films contain at least one polyethylene glycol and / or

Polypropylene glycol as plasticizer. The use of polyethylene glycol having a molecular weight of> 20,000 g / mol, preferably 25,000 g / mol as a plasticizer is particularly preferred.

In a preferred embodiment, at least one layer (a) of the plastic films according to the invention plasticizer, preferably in an amount of 1-20 wt.%, Particularly preferably 5-15 wt .-%, based on the

Total weight of the layer (a), exhibit. Each layer of the plastic film according to the invention may preferably contain a plasticizer, if appropriate in different amounts.

The plastic films according to the invention preferably contain the plasticizer in an amount of 1-15% by weight, particularly preferably 3-10% by weight, based on the total weight of the plastic film.

This total content of plasticizers can be distributed not only on layers (a) but also on any other layers present, in particular further internal layers of the plastic films according to the invention. In this case, the content of the plasticizer - if present in one layer - each independently of the plasticizer content of any further existing layers, preferably in each case 1-20 wt .-%, particularly preferably 5-15 wt .-%, each based on the total weight of single layer amount. Preferably, the plasticizer content is higher in at least one inner layer than in the outer layers.

In a preferred embodiment, at least one, preferably all, inner layers of the plastic films according to the invention contain plasticizers and outer layers no plasticizer.

The biodegradable plastic films according to the invention are distinguished from conventional plastic films based on biodegradable polymers in that they have improved mechanical properties, for example increased toughness, preferably increased

Tear propagation resistance.

Furthermore, the plastic films according to the invention are characterized in that they both by conventional cast film extrusion process as well as by

Conventional blown film extrusion process can be prepared, wherein the extrusion can also be effected by coextrusion and the cast film extrusion process is preferably preferred by means of flat dies.

The preparation of the plastic films according to the invention can also by

Lamination done.

The plastic films according to the invention can be in the form of individual layers, as a partial composite or as entire multi-layer films, possibly also in the form of

Tubular films, produced and processed.

In a preferred embodiment, at least part of the

Plastic films according to the invention, preferably consisting of at least one layer (a) and at least two other biodegradable layers, produced in the form of a cast film (as a flat-film extrudate).

In a further preferred embodiment, the entire

Plastic films according to the invention in the form of a coextruded cast film

getting produced. In a further embodiment, the plastic film according to the invention can be produced as a multilayer blown film, by extrusion, preferably by blown film coextrusion.

In this case, during the production of the plastic films according to the invention, the film tube for biaxial stretching with a blow-up ratio of preferably 1: 1, 5 to 1: 3 and take-off ratio of preferably 100: 1 to 12: 1, more preferably 60: 1 to 12: 1, inflated become.

If necessary, the plastic films produced as Castfolien at least monoaxially, preferably in the longitudinal or transverse direction, in a

Stretch ratio of at least 1: 1.5, preferably at least 1: 2, more preferably 1: 2 to 1: 4, or biaxially, i. in the longitudinal and transverse directions in each case in a draw ratio of 1: 1, 5 to 1: 10, particularly preferably 1: 2 to 1: 4, are stretched.

The extruded films may already be stretched to a desired extent during production, or preferably immediately after extrusion.

Preferably, the orientation is maintained during the further processing steps.

The respective production processes and corresponding production parameters are generally known and familiar to the person skilled in the art.

The biodegradable plastic films according to the invention may also preferably be provided with a pressure-sensitive adhesive layer by coating or laminating one of their surfaces. In order to protect the adhesive layer, it may optionally be provided in a subsequent operation with a removable protective film or a removable one

Protective layer can be provided as a cover. The plastic films according to the invention may optionally have peeling properties, for example in the form of a biodegradable peel layer.

In a preferred embodiment, the plastic film according to the invention is transparent.

The inventive, predominantly biodegradable plastic film can be printed, coated, preferably siliconized or metallized, and / or colored.

The plastic film according to the invention is preferably suitable as

Packaging material for various consumer goods, such as for food, flowers or plants, since the plastic film is predominantly biodegradable.

Another object of the present invention is therefore a use of a preferably transparent plastic film according to the invention as a predominantly biodegradable packaging material for consumer goods, such as food, preferably vegetables, fruits, meat products, for flowers or plants or a corresponding packaging with these products.

A transparent plastic film according to the invention is also suitable as

Window for otherwise non-transparent packaging made of biodegradable materials. In particular, a transparent plastic film according to the invention can serve as a predominantly biodegradable window for non-transparent, biodegradable cardboard packaging or envelopes.

The plastic film of the invention may further be provided with a pressure-sensitive adhesive layer as predominantly biodegradable labels, or possibly printed as predominantly biodegradable protective or decorative film for books or cardboard.

Another object of the present invention is therefore a use of the plastic film as a predominantly biodegradable window for preferably otherwise non-transparent packaging, preferably Cardboard packaging, preferably for food, as a viewing window of envelopes, as a predominantly biodegradable sticker, possibly with a

pressure-sensitive adhesive layer is provided as predominantly biological

degradable, labeled or unlabelled labels or possibly printed as a predominantly biodegradable protective or decorative film for books and cardboard and the corresponding products.

The following examples serve to illustrate the invention, but are not to be interpreted as limiting.

I. Chemical characterization of the raw materials used

PLA 2003 D: Polylactide from Nature ^Works® LLC Coex-inline PLA PLA 2003 D

Compound PLA / PEG-35000S-15% Compound of PLA 2003 D and 15% by weight

Polyethylene glycol with a middle

Molecular weight of 35000 g / mol

PLA DC S 511 slip / antiblock / masterbatch made of PLA DC S 511 from Clarifier -7% Sukano with 7% by weight of

Slip / antiblocking / clarifier additives

Bynel 21 E 787 ethylene-methyl acrylate copolymer grafted with maleic anhydride

Bynel 21 E 830 ethylene-methyl acrylate copolymer grafted with maleic anhydride

Sukano Optical Brightener optical brightener batch in PLA, Sukano PLA S 515-BL

II. Production of plastic films

The plastic films of Examples 1-3 (B1-B3) and Comparative Example V1 each consist of 5-7 layers and have the following Total layer thicknesses on. The individual layers of the plastic films each adjoin one another directly in the order in which they are listed below. All the plastic films of the examples below were each produced as cast films by co-extrusion of the layers through flat dies (via a slot die).

III. Construction of the plastic films

All subsequent% data are each wt%.

111.1 Example 1 (B1): total layer thickness: 170 μιτι

Table 1

Layer raw materials relative layer thickness

1 PLA DC S 511 Slip / Antiblock / Clarifier - 7% (3%) 0.12

PLA 2003 D (97%)

2 PLA 2003 D (47.5%) 0.13

Compound PLA / PEG-35000S-15% (32.5%)

Bynel BYN 21 E 787 (20%)

3 coex-inline PLA (20%) 0.50

PLA 2003 D (28%)

Compound PLA / PEG-35000S-15% (52%)

4 PLA 2003 D (47.5%) 0.13

Compound PLA / PEG-35000S-15% (32.5%)

Bynel BYN 21 E 787 (20%)

5 PLA DC S 51 1 Slip / Antiblock / Clarifier - 7% (3%) 0.12

PLA 2003 D (97%)

III.2 Example 2 (B2): total layer thickness: 200 μιη

Table 2

Layer raw materials relative layer thickness

1 PLA DC S 51 1 Slip / Antiblock / Clarifier - 7% (3%) 0.12

PLA 2003 D (97%)

2 PLA 2003 D (57.5%) 0.13

Compound PLA / PEG-35000S-15% (32.5%) Bynel BYN 21 E 787 (10%)

3 coex-inline PLA (20%) PLA 2003 D (28%) 0.50

Compound PLA / PEG-35000S-15% (51%)

Sukano Optical Brightener PLA S 515-BL (1%)

4 PLA 2003 D (57.5%) 0.13

Compound PLA / PEG-35000S-15% (32.5%)

Bynel BYN 21 E 787 (10%)

5 PLA DC S 511 Slip / Antiblock / Clarifier - 7% (3%) 0.12

PLA 2003 D (97%)

111.3 Example 3 (B3): total layer thickness: 200 pm

Table 3

IV. Comparative Example (VI) without Bynel BYN 21E787

Total layer thickness: 200 pm

Table 4

Layer raw materials relative layer thickness

1 PLA DC S 511 Slip / Antiblock / Clarifier - 7% (3%) 0.12

PLA 2003 D (97%) 2 PLA 2003 D (45%) 0.13

Compound PLA / PEG-35000S-15% (55%)

3 coex-inline PLA (20%) 0.50

PLA 2003 D (20%)

Compound PLA / PEG-35000S-15% (60%)

4 PLA 2003 D (45%) 0.13

Compound PLA / PEG-35000S-15% (55%)

5 PLA DC S 511 Slip / Antiblock / Clarifier- 7% (3%) 0.12

PLA 2003 D (97%)

V. Measurement of the tear strength according to DIN 53363 - trapeze

From each of the multilayer plastic films B1 - B3 or V1, the tear propagation resistance in the machine direction (md) as tenacity (N) was determined by 10 measurements and reproduced in Table 5 below.

Table 5

Example tear strength (N) according to DIN 53363 - trapeze

(Md)

B1 33.5

B2 36.7

B3 62.2

V1 28.4

Claims

claims:

1 A predominantly biodegradable, single or multi-layered

Plastic film consisting of

at least one layer (a) composed of a mixture of at least one biodegradable polymer and up to a maximum of 35 wt.%, Based on the total weight of the layer (a), at least one

modified, thermoplastic copolymers of α, β-unsaturated olefins having 2-10 C atoms and (meth) acrylic acid and / or at least one

(Meth) acrylic acid derivative which is grafted, preferably with cyclic

Anhydride groups and / or carboxyl groups and / or ester groups, optionally from at least one plasticizer, and optionally one or more conventional additives;

the remaining possibly existing layers of at least one

biodegradable polymers, optionally a modified thermoplastic copolymer of α, β-unsaturated olefins having 2-10 C atoms and

(Meth) acrylic acid and / or at least one (meth) acrylic acid derivative which is grafted, preferably with cyclic anhydride groups and / or

Carboxyl groups and / or ester groups, optionally at least one plasticizer; and optionally one or more conventional additives, and

wherein the total amount of the modified thermoplastic copolymers on the plastic film at most 15 wt.% Based on the total weight of the plastic film, and

wherein the plastic films has no adhesive layer. A plastic film according to claim 1, characterized in that the

Plastic film multilayer, preferably at least three layers, more preferably five-layered. A plastic film according to claim 1 or 2, characterized in that as modified thermoplastic copolymer at least one polymer selected from the group comprising copolymers of ethylene and

Methacrylic acid, copolymers of ethylene and methacrylate, copolymers of Ethylene and acrylic acid, and copolymers of ethylene and acrylate, each grafted preferably with cyclic anhydride groups and / or

Carboxyl groups and / or ester groups present.

A plastic film according to any one of claims 1-3, characterized in that the modified thermoplastic copolymer is present in an amount of 1-30% by weight, preferably 5-25% by weight, based on the total weight of the respective layer (a).

A plastic film according to any one of claims 1-4, characterized in that the total amount of the modified thermoplastic copolymer in the plastic film at most 10 wt .-%, based on the total weight of the plastic film is.

A plastic film according to any one of claims 1-5, characterized in that each layer is predominantly biodegradable.

A plastic film according to any one of claims 1-6, characterized in that the biodegradable polymer at least one biological

degradable synthetic polymer selected from the group

comprising lactic acid homopolymers and copolymers, preferably polylactides, polyhydroxyalkanoates, polyesters of lactones having 4-10 C atoms,

preferably polycaprolactones, copolymers of at least 2 monomers of said polymers and mixtures of at least two of said polymers.

A plastic film according to any one of claims 1-7, characterized in that as polylactide, a poly-L-actid, poly-D-lactide, poly-DL-lactide or an isomeric, optionally racemic mixture of poly-L-lactide and poly -D-lactide is present.

A plastic film according to any one of claims 1-8, characterized in that the plastic film in one or more layers at least one plasticizer, preferably a polymeric plasticizer, especially preferably at least one polyalkylene oxide having a molecular weight>

20,000, preferably> 25,000 g / mol. A plastic film according to any one of claims 1-9, characterized in that the plasticizer in at least one layer (a) in an amount of 1 - 20 wt.%, Preferably 5-15 wt .-%, based on the total weight of the layer ( a). A plastic film according to any one of claims 1-10, characterized

characterized in that the plasticizer content in at least one

inner layer, preferably an inner layer (a) is higher than in the outer layers. A plastic film according to any one of claims 1-11, characterized in that the plastic film was produced as a cast film. A plastic film according to any one of claims 1-12, characterized

characterized in that the plastic film is transparent or provided with a layer of pressure-sensitive adhesive. A use of a plastic film according to any one of claims 1-13 as packaging material for consumer goods, such as food, preferably

Vegetables, fruits, meat products, for flowers or plants. Use of a plastic film according to one of claims 1 to 13 as

Window for otherwise non-transparent packaging, preferably

Cardboard packaging, preferably for food, as a viewing window of envelopes, as stickers, which may be provided with a pressure-sensitive adhesive layer, as labeled or unlabeled labels or possibly printed as a protective or decoration film for books and cardboard. A plastic film packaging according to any one of claims 1-13 having consumer goods packaged therein, preferably food, flowers or plants. A viewing window, a sticker, a label or a protective or decorative film made of a plastic film according to one of claims 1