EP2794269A1

EP2794269A1 - A blown plastic film made from biodegradable polymers

Info

Publication number: EP2794269A1
Application number: EP12823146.1A
Authority: EP
Inventors: Kurt Stark; Larissa Zirkel; Roland Kelm
Original assignee: Huhtamaki Films Germany GmbH and Co KG
Current assignee: Loparex Germany GmbH and Co KG
Priority date: 2011-12-19
Filing date: 2012-12-06
Publication date: 2014-10-29
Also published as: WO2013091781A1; DE102011121243A1

Abstract

The present invention relates to a possibly multiple-layer blown plastic film made from biodegradable polymers, comprising at least one layer made from at least one biodegradable polymer and from 0.1 to at most 5% by weight, in relation to the total weight of the blown plastic film, of at least one olefin oligomer or polyolefin from C2-C8 repeating structural units as superplasticizer, to a method for producing the blown plastic film, and to the use of a blown plastic film of this type as packaging material.

Description

One of biodegradable polymers

constructed plastic blown film

The present invention relates to a possibly made of biodegradable polymers, possibly multilayer plastic blown film comprising at least one layer of at least one biodegradable polymer and at most 5 wt .-%, based on the total weight of the plastic blown film, at least one olefin oligomer or Polyolefins from C ₂ - C ₈ recurring

Structural units as flow agents, a method for producing the plastic blown film and a use of such a plastic blown film as

Packing material.

Plastic films based on biodegradable raw materials are increasingly used as packaging material, since this is compostable and can be produced on the basis of renewable raw materials.

However, these plastic films have the disadvantage that they with the help of

Conventional blown film extrusion process are difficult to produce, since the inflated, extruded film tube have too low stability and can tear as a result. Furthermore, films based on biodegradable raw materials can be brittle, which results in a wrinkle-free winding of the

Foil tube is difficult. In addition, film hoses based on biodegradable feedstock thus produced can exhibit thickness variations greater than 10% over the total film width, i. have an unsatisfactory thickness profile.

It is known that these disadvantages of plastic films from conventional

Thermoplastics, such as polyolefins, can be remedied by the addition of fluorinated polyolefins as flow agents. However, fluorinated polyolefins are not compatible with biodegradable feedstocks such as polylactides, nor is the use of the highly stable, non-biodegradable fluorinated polyolefins desirable in plastic films having as high a compostable content as possible. From WO 2006/026546 a process for the preparation of a polylactide blown film is known, in which an increased stability of the inflated film tube is achieved by the viscosity of the polymer melt is increased prior to inflation of the film tube by cooling and optionally adding polymeric crosslinking agents.

The object of the present invention was therefore to provide a plastic film which consists predominantly of biodegradable polymers and has improved mechanical properties. In addition, the should

Plastic film as possible have no thickness fluctuations and without the disadvantages described above using conventional blown film extrusion process on corresponding conventional blown film extrusion plants to be produced.

This object was achieved by providing a possibly multilayer plastic blown film composed of biodegradable polymers comprising at least one layer of at least one biodegradable polymer and at most 5% by weight, based on the total weight of the plastic blown film, of at least one olefin oligomer or polyolefins of C-2 - Ce, preferably C ₂ - C, recurring structural units as flow agents, dissolved.

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 blown film under the action of microorganisms and / or enzymes to water, carbon dioxide and biomass according to DIN EN 13432 is decomposable and in the disintegration test in the aerobic composting after 12 weeks, a biological degradation of at least 90%, preferably at least 95%, particularly preferably> 99% is achieved.

In a preferred embodiment of the plastic blown film according to the invention, the entire plastic blown film is predominantly biodegradable, i. in the

Under the method described above, the entire plastic blown film after 12 weeks to more than 50 wt .-%, preferably more than

70 wt .-%, particularly preferably more than 80 wt .-% degraded. For the purposes of the present invention, the term "plastic blown film" is understood to mean a plastic film which has been produced by means of blown film extrusion processes.

For the purposes of the present invention, the term "constructed from" is understood to mean that the plastic film or the relevant layer of the plastic film contains the component (s) listed behind this term as the main constituent; i.e. to more than 50% by weight of this component (s). Preferably, the plastic film or layer consists 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 blown film according to the invention may be single-layered or multi-layered.

Preferably, the plastic blown film is at least three layers. In a preferred embodiment, the plastic blown film is at least five layers.

The plastic blown film according to the invention has at least one layer of at least one biodegradable polymer, preferably as

Outer layer, on.

The at least three-layered plastic blown film preferably has at least two layers, each of at least one biodegradable polymer, preferably as outer layers.

The at least three-layered plastic film may comprise further layers of at least one biodegradable polymer.

In a preferred embodiment, all layers of the plastic blown film have at least one biodegradable polymer, preferably as the main constituent.

In a preferred embodiment, the amount of biodegradable polymers in the plastic blown film according to the invention is at least 75% by weight, preferably at least 80 wt .-%, particularly preferably at least 85 wt .-%, based on the total weight of the plastic blown film.

At least one biodegradable polymer selected from the group comprising lactic acid homo- and copolymers, preferably polylactides, more preferably from poly-DL-lactide (PDLLA) are preferably suitable as biodegradable polymers for producing the corresponding layer (s) of the plastic blown film. , pure poly-L-lactide (PLLA) and / or pure poly-D-lactide (PDLA), polyhydroxyalkanoates, cellulose, cellulose derivatives, thermoplastic starch, polyesters of 4-10 C-lactones, more preferably

Polycaprolactones, copolymers of at least 2 monomers of the mentioned

Polymers and mixtures of at least two of said polymers, preferably polylactides.

As biodegradable polyesters, polyesters of lactones with 4-10

C atoms such as e.g. Caprolactone be used. Biodegradable polyesters suitable according to the invention are preferably polycaprolactones or

Polylactides.

The terms "lactic acid homopolymer", "lactic acid copolymer", "polylactide (PLA)" according to the invention homo- or copolymers based on lactic acid understood, regardless of whether they were prepared from lactic acid, lactide oligomers or lactides.

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 can be obtained by catalytic ring-opening polymerization of lactides. In this case, D-lactides, L-lactides and / or D, L-lactides (meso-lactides) can be used.

Preferably, particularly preferably, the

Layer (s) of the blown film of biodegradable polymers according to the invention at least one polylactide, preferably selected from the group consisting of poly-L-actide, poly-D-lactide, poly-DL-lactide and an isomeric, optionally racemic mixture of poly-L-lactide and poly-D-lactide.

In a preferred embodiment of the plastic blown film according to the invention, the plastic blown film has a polylactide in at least two layers, it being possible for the layers, in particular the polylactide component, layer thickness and / or composition of the layers, to be the same or different from one another.

In a further preferred embodiment of the plastic blown film according to the invention, the plastic blown film has the same properties in at least two layers

Polylactide component, layer thickness and / or composition.

In order to increase the transparency of the plastic blown film according to the invention, a biodegradable polymer is preferably a poly-L- or poly-D-lactide which is 1-15% by weight, preferably 1-10% by weight, of the other Enantiomers contains used. Either a mixture of poly-L-lactide and 1-15 wt.%, Preferably 1-10 wt.%, Poly-D-lactide or a mixture of poly-D-lactide and 1-15 wt. %, preferably 1 -10 wt .-%, poly-L-lactide are used.

In a preferred embodiment of the at least three-layer plastic blown film, the outer layers have a layer thickness of at most 50 μm, particularly preferably at most 25 μm, very particularly preferably at most 10 μm.

The plastic blown film according to the invention has at most 5 wt .-%, based on the total weight of the plastic blown film, at least one olefin oligomer or polyolefin of C2 - C _8l preferably C2 - C ₄ , recurring

Structural units as superplasticizer.

The term "olefin oligomer of C ₂ - C ₈ recurring structural units" oligomers are referred to in the invention, the recurring structural units derived from one or more olefins having 2 to 8 carbon atoms. The Number of repeating structural units of the oligomer is preferably 4 to 30, more preferably 6 to 30, and most preferably 10 to 30. Molecules having more than 30 repeating structural units become

referred to as polyolefins according to the invention.

The repeating structural units are preferably derived from one or more α, β-unsaturated olefin (s) having 2 to 8, preferably 2 to 4

C atoms off. Suitable α, β-unsaturated olefins are preferably selected from the group consisting of ethylene, propylene, butylene, hexene and octene, more preferably selected from ethylene, propylene and butylene, and most preferred is ethylene.

In a preferred embodiment of the plastic blown film according to the invention is at least one olefin oligomer or polyolefin at least one olefin selected from the group consisting of ethylene, propylene, butylene, mixtures of ethylene / propylene and ethylene / hexene and / or octene, in particular from Ethylene, propylene, butylene, and mixtures thereof, before.

In a particularly preferred embodiment of the invention

Plastic blown film may contain as flow agents polymers of α, β-unsaturated olefins having 2-8 carbon atoms, preferably 2-4 carbon atoms, e.g.

Polyethylene (PE, in particular LDPE or HDPE), polypropylene (PP), polybutylene (PB), polyisobutylene (PI) or mixtures of at least two of said polymers are used. With "LDPE" becomes low density polyethylene

which has a density in the range of 0.86-0.93 g / cm ³ and is characterized by a high degree of branching of the molecules. By "HDPE" is meant high density polyethylene which has little branching of the molecular chain, the density may range between 0.94 and 0.97 g / cm ³ .

Particularly preferred polyolefins for use as flow agents are ethylene homo- or copolymers and propylene homo- or copolymers. Very particular preference is given to polyethylene, in particular LDPE having a density in the range of

0.91-0.93 g / cm ³ . Preferably, the flow agent is in an amount of 0.1-5 wt .-%, particularly preferably from 0.1 to 3 wt .-%, most preferably from 0.2 to 1 wt.%, In particular from 0.2 0.99 wt.%, Based on the total weight of

Plastic blown film, in front.

The flow agent is preferably at least partially present in at least one of the outer layers, preferably in both outer layers, of an at least three-layer plastic blown film according to the invention.

Preferably, at least one of the outer layers, preferably both outer layers, of the at least three-layer plastic blown film, the flow agent in an amount of 0.2 to 10 wt .-%, preferably 0.5 to 5 wt .-%, each based on the weight of respective outer layer, on, wherein the above-mentioned total amount, based on the total weight of the plastic blown film, should not be exceeded.

In a preferred embodiment, the flow agent is in each case in the same proportions in the outer layers of the at least three-layer plastic blown film.

In a preferred embodiment of the at least three-layer plastic blown film, the two outer layers are each of at least one biodegradable polymer and at least one olefin oligomer or polyolefin from C ₂ - C ₈ , preferably C ₂ - C ₄ , recurring structural units as flow agents in said Quantities, built up.

In a preferred embodiment, the at least three-layered plastics blown film, the two outer layers each of at least one polylactide and at least one polyolefin is selected from C2 - _C4 recurring structural units, preferably polyethylene, constructed as a flow agent in the amounts mentioned.

The at least three-layer plastic blown film according to the invention may contain one or more adhesion promoter layers. For the preparation of the adhesion promoter layer (s) are preferably suitable thermoplastic olefin homopolymers or copolymers of α, β-unsaturated olefins having 2-10 C-atoms, with polar groups, preferably with organic

Acid groups (carboxyl groups) and / or organic acid anhydride groups, particularly preferably maleic anhydride groups are modified. Particularly preferred are ethylene-vinyl acetate copolymers or with acidic groups, with anhydride groups and / or with acrylate-modified ethylene homo- or

Copolymers.

The at least three-layered plastic blown film according to the invention may contain one or more barrier layers, preferably oxygen and / or water vapor barrier layers, wherein the barrier layers are optionally connected in each case via an adhesion promoter layer with the remaining layers of the film composite.

Homo- or copolyamides, polyvinyl alcohols, ethylene-vinyl alcohol copolymers, and mixtures thereof are particularly suitable for the preparation of the barrier layer (s).

For the preparation of the barrier layer (s) suitable homo- or copolyamides are preferably selected from the group of thermoplastic aliphatic, partially aromatic or aromatic homo- or copolyamides. These homo- or copolyamides can be prepared from diamines such as 2-10 aliphatic diamines

Carbon atoms, in particular hexamethylenediamine and / or aromatic diamines having 6-10 carbon atoms, in particular p-phenylenediamine and dicarboxylic acids are prepared from aliphatic or aromatic dicarboxylic acids having 6-14 carbon atoms such as adipic acid, terephthalic acid or isoterephthalic acid. Furthermore, homo- or copolyamides can be prepared from lactams having 4-10 carbon atoms, such as from ε-caprolactam. Particularly preferred polyamides are PA 6, PA 12, PA 66, PA 61, PA 6T or corresponding copolymers or mixtures of at least two of said polyamides. The polyvinyl alcohol used for the preparation of the barrier layer (s) can be obtained by complete or incomplete hydrolysis of corresponding

Polyvinyl acetates (PVA) are recovered and thus comprise both partially saponified polyvinyl acetates having a saponification degree of 50 to 98 mol%, as well as fully saponified polyvinyl acetates with a degree of saponification> 98%.

The ethylene-vinyl alcohol copolymers (EVOH) used to prepare the barrier layer (s) can be obtained by hydrolysis of corresponding ethylene-vinyl acetate copolymers (EVAc) and preferably comprise ethylene-vinyl alcohol copolymers (EVOH) having a degree of saponification of> 98%. and an ethylene content of 0.01-20 mol%, preferably 0.1-10 mol%.

Preferably, the plastic blown film has a very small thickness variation, preferably of ^ 5%, more preferably ^ 3%, over the entire web width of the flattened, separated plastic blown film.

Each of the layers of the plastic blown film according to the invention may, in each case independently of one another, be selected from the group comprising antioxidants, antiblocking agents, antifogging agents, antistatic agents, antimicrobial agents, light stabilizers, UV absorbers, UV filters, dyes, color pigments,

Stabilizing agents, 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,

Nucleating agents, crystallizing agents, preferably nucleating agents,

Lubricants, optical brighteners, flexibilizers, sealants, plasticizers, silanes, spacers, fillers, peel additives, waxes, wetting agents, surface-active compounds, preferably surfactants, and dispersants. These additives are preferably biodegradable.

In this case, the content of the aforementioned additives - if present in one layer, in each case 0.001-30 wt .-%, preferably 0.01-20 wt .-%, each based on the total weight of the individual layer, amount. Preferably, the plastic blown film according to the invention contains in at least one outer layer, more preferably in both outer layers, at least one additive selected from the group comprising antiblocking agents, antistatic agents, lubricants and mixtures thereof, preferably in a total amount of at most 5 wt .-%, particularly preferably at most 3 wt .-%, in particular at most 1 wt .-%, each based on the total weight of the layer.

Preferably, at least one layer of biodegradable contains

Polymers of the plastic blown film according to the invention at least one

Plasticizer, more preferably at least one polymeric plasticizer, most preferably at least one polyalkylene oxide having a molecular weight of 20,000, preferably 25,000 g / mol.

In a preferred embodiment of the plastic blown film according to the invention, the plastic blown film contains at least one polypropylene glycol and / or

Polyethylene glycol (PEG) as plasticizer. The use of polyethylene glycol having a molecular weight> 20,000 g / mol as a plasticizer is particularly preferred.

The plasticizer is preferably present in the plastic blown film according to the invention in an amount of 1-15% by weight, more preferably 2-10% by weight, based on the total weight of the optionally multilayer plastic blown film.

For this purpose, the layer (s) of the plastic blown film according to the invention, each independently, be equipped with the plasticizer. In this case, the content of the plasticizer-if present in one layer-is preferably in each case 5-30% by weight, particularly preferably 10-20% by weight, in each case based on the total weight of the individual layer.

In a preferred embodiment of the invention at least

three-layer plastic blown film, is at least an inner layer with

Plasticizer equipped. In a further preferred embodiment of the at least three-layer plastic blown film according to the invention, the plasticizer content in at least one inner layer is higher than in the outer layers.

In another preferred embodiment, the inventive

Plastic blown film no viscosity-increasing agent, preferably no chemical optionally polymeric crosslinking agent as a viscosity-increasing agent, on.

In another preferred embodiment, the inventive

Plastic blown film at most 0.1 wt .-%, based on the total weight of the plastic blown film, a viscosity increasing agent, preferably a chemical optionally polymeric crosslinking agent, on.

Preferably, the plastic blown film is subjected to biaxial stretching by drawing a bubble during the manufacturing process. The blow-up ratio is preferably 1: 1, 5 to 1: 3 and the draw-off ratio is preferably 100: 1 to 12: 1, particularly preferably 60: 1 to 12: 1. Preferably, the orientation is maintained during the subsequent steps of the manufacturing process.

The plastic blown film according to the invention may optionally have peel properties,

for example, a peel layer.

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

The plastic blown film according to the invention can be printed, coated, preferably siliconized or metallized, and / or dyed.

The plastic blown film according to the invention can also be equipped with a pressure-sensitive adhesive layer.

The plastic blown film according to the invention is distinguished from the usual

Plastic blown films based on biodegradable polymers characterized in that it has improved physical properties, such as lower brittleness, and an extremely homogeneous thickness distribution.

Furthermore, the plastic blown film according to the invention is characterized in that it can be easily produced by conventional blown film extrusion process. In particular, the polymer melt used in the preparation has good flowability and the inflated film tube made therefrom by extrusion has sufficient stability without the addition of a viscosity enhancing agent, such as e.g. a polymeric crosslinking agent, or special, different from the conventional extrusion blown film process steps, such as

Temperierungsschritte to increase the viscosity of the polymer melt, are required.

A further subject of the present invention is therefore a process for producing a possibly multilayer plastic blown film, which is characterized in that at least one biodegradable polymer listed above is mixed with the flow agent, preferably in the form of a masterbatch, preferably in an extruder. optionally mixed with in each case further additives, preferably likewise in the form of a masterbatch, the mixture obtained in the respective extruder melted and the respective melt extruded without prior cooling to increase viscosity through a ring die to an inflated, multilayer Blasfolienschlauch (co), and after Cooling and flattening separated, and wound up as a plastic blown film or rolled up.

The plastic blown film according to the invention is suitable as a packaging material for various consumer goods, such as food, flowers or plants. Another object of the present invention is therefore a use of the preferably transparent plastic blown film as packaging material for consumer goods, such as food, preferably vegetables, fruits, meat products, flowers or plants.

The transparent plastic blown film according to the invention is also suitable for use as a viewing window for mostly non-transparent packaging made from other, biodegradable materials. In particular, the transparent plastic blown film according to the invention can be used as a window for non-transparent, biodegradable cardboard packaging or envelopes.

The plastic blown film according to the invention can also be provided with a pressure-sensitive adhesive layer as labels, or optionally printed as protective or

Decorative film for books or cardboard boxes are used.

Another object of the present invention is therefore a use of the plastic blown film as a window for packaging, preferably

Cardboard packaging, preferably for food, as a 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.

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

PLA 2002 D: Polylactide from Nature ^Works® LLC

PLA 4032 D: Polylactide from Nature ^Works® LLC

PLA 4060 D: polylactide from Nature ^Works® LLC

MB PLA / PE 20% - Lupolen 2420 F Masterbatch from PLA 2003 D and 20% LDPE

(Lupolen 2420 F from Firmal Lyondell Basell) MB PLA / PE 10% - Lupolen 2420 F Masterbatch from PLA 2003 D and 10% LDPE

(Lupolen 2420 F from Firmal Lyondell Basell) MB PLA / PE 20% - Lupolen 3020 H Masterbatch from PLA 2003 D and 20% LDPE

(Lupolen 3020 H from Firmal Lyondell Basell) MB PLA / PE 20% - Lupolen 3020 K Masterbatch from PLA 2003 D and 10% LDPE

(Lupolen 3020 K of Firmal Lyondell Basell) Compound PLA / PEG-35000S-15% Compound of PLA 2003 D and 15% by weight

PEG 35000 (molecular weight: 35000 g / mol)

PLA DC S 511 Slip / Antiblocky Masterbatch made of PLA DC S 511 from Clarifier -7% Sukano with 7 wt .-% of

Slip / antiblocking / clarifier additives

II. Production of plastic blown films

The plastic blown films of Examples 1-2 (B1-B2) each consist of 5 layers and have the total layer thicknesses given below. The individual layers of the plastic blown films each adjoin one another directly in the order in which they are listed below. All plastic blown films of Examples given below were each prepared by blown film coextrusion.

III. Construction of the blown film

All subsequent% data are each wt%.

///.1 Example 1 (B1): total layer thickness: 25 μητι

Layer raw materials relative layer thickness

1 PLA 2003 D (92.5%) 0.25

PLA DC S 511 Slip / Antiblock / Clarifier - 7% (2.5%)

MB PLA / PE 0% - Lupolen 2420 F (5%)

2 Compound PLA / PEG-35000S-15% (100%) 0.1667

3 Compound PLA / PEG-35000S-15% (100%) 0.1667

4 Compound PLA / PEG-35000S-15% (100%) 0.1667

5 PLA 2003 D (92.5%) 0.25

PLA DC S 511 Slip / Antiblock / Clarifier - 7% (2.5%)

MB PLA / PE 10% - Lupolen 2420 F (5%)

III.2 Example 2 (B2): total layer thickness: 25 pm

Layer raw materials relative layer thickness

1 PLA 2003 D (92.5%) 0.25

PLA DC S 511 Slip / Antiblock / Clarifier - 7% (2.5%)

MB PLA / PE 20% - Lupolen 3020 H (1, 3%)

2 Compound PLA / PEG-35000S-15% (100%) 0.1667

3 Compound PLA / PEG-35000S-15% (100%) 0.1667

4 Compound PLA PEG-35000S-15% (100%) 0.1667

5 PLA 2003 D (92.5%) 0.25

PLA DC S 511 Slip / Antiblock / Clarifier - 7% (2.5%)

MB PLA PE 20% - Lupolen 3020 H (1, 3%)

Claims

claims:

1. A built-up of biodegradable polymers, optionally multilayer plastic blown film comprising at least one layer of at least one biodegradable polymer and 0.1 to at most 5 wt.%, Based on the total weight of the plastic blown film, at least one olefin oligomer or polyolefins of C ₂ -C ₈ , preferably C ₂ -C ₄ ,

recurring structural units as flow agents.

2. A plastic blown film according to claim 1, characterized in that the plastic blown film is at least three layers.

3. A plastic blown film according to claim 2, characterized in that the flow agent is preferably present in each case to the same proportions in the outer layers of the at least three-layer plastic blown film.

4. A plastic blown film according to any one of claims 1-3, characterized

in that the recurring structural units of the olefin oligomer or polyolefin are derived from an olefin selected from the group consisting of ethylene, propylene, butylene, mixtures of ethylene / propylene or ethylene / hexene and / or octene.

5. A plastic blown film according to any one of claims 1-4, characterized

in that the flow agent is present in an amount of 0.1-3% by weight, based on the total weight of the plastic blown film.

6. A plastic blown film according to any one of claims 1-5, characterized

in that as the biodegradable polymer at least one biodegradable polymer selected from the group comprising lactic acid homo- and copolymers, preferably polylactides,

Polyhydroxyalkanoates, cellulose, cellulose derivatives, thermoplastic starch, polyesters of lactones having 4-10 C atoms, more preferably

Polycaprolactones, copolymers of at least 2 monomers of the mentioned Polymers and mixtures of at least two of said polymers, preferably polylactides, is present.

7. A plastic blown film according to claim 6, characterized in that the polylactide is a poly-L-actid, poly-D-lactide, poly-DL-lactide or an isomeric, optionally racemic mixture of poly-L-lactide and poly D-lactide, preferably a poly-L-lactide or poly-D-lactide, the 1-15 wt.% Of the other

Enantiomers is.

8. A plastic blown film according to any one of claims 1-7, characterized

characterized in that the plastic blown film has a thickness variation of <5% over the entire web width of the flattened, separated plastic blown film.

9. A plastic blown film according to any one of claims 1-8, characterized

in that the plastic blown film preferably contains in at least one outer layer at least one additive selected from the group comprising antiblocking agents, antistatic agents, lubricants and mixtures thereof.

10. A plastic blown film according to any one of claims 1-9, characterized

in that at least one layer of biodegradable polymers of the plastic blown film comprises at least one plasticizer,

preferably a polymeric plasticizer, more preferably at least one polyalkylene oxide having a molecular weight of 20,000, preferably

25,000 g / mol, preferably in an amount of 1-15 wt.% Based on the total weight of the optionally multilayer plastic blown film contains.

1 1. A plastic blown film according to claim 10, characterized in that the plasticizer content is higher in at least one inner layer than in the outer layers.

12. A method for producing a possibly multilayer plastic blown film according to one of claims 1-11, characterized in that at least one biodegradable polymer with the flow agent, preferably in the form of a Masterbatch.es, preferably mixed in an extruder, optionally mixed with further additives, preferably also in the form of a masterbatch, melted the resulting mixture in the respective extruder and the respective Melt without a previous cooling to increase the viscosity through an annular nozzle to an inflated, multi-layered

Blown film tube (co) extruded, separated after cooling and flattening, and wound up or rolled up as a plastic blown film.

13. A use of the plastic blown film according to one of claims 1 - 11 as a packaging material for consumer goods, such as food, preferably

Vegetables, fruits, meat products, for flowers or plants.

14. Use of a plastic blown film according to one of claims 1 - 11 as a viewing window for packaging, preferably cardboard packaging,

preferably for food, as a 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.