Patent Description:
Plastic packaging is widely used in daily life due to a favorable cost/performance ratio. Polyolefins are easy and economical to produce with good properties and are widely used in plastic packaging.

Conflicting properties are often required in the packing industry. For example, high stiffness and toughness as well as excellent sealing behavior and good optical properties are required in parallel for plastic films. Different types of polyolefin, for example polypropylene and polyethylene, are routinely combined in blends and/or used in different layers of multilayer films to achieve desired properties. However, use of more than one polymer type complicates the task of recycling the resulting plastic packaging.

One approach to enabling recycling is a 'single material solution', where only one type of polymer material is used. This simplifies recycling of both post-consumer waste and manufacturing waste but limits the range of properties that are available. As such, there is still a need for plastic packaging that may be formed from a single polymer type though comprising various different polymer grades within HLZ:JN that polymer type, optimizing the mechanical, optical and sealing properties required for packaging materials, whilst also being straightforward to recycle. <CIT> relates to multilayer blown films.

Therefore, the present invention is directed to a multilayer film (F), comprising, in the given order, the following layers:.

describing and claiming the present invention, the following terminology will be used in accordance with the definitions set out below.

Unless clearly indicated otherwise, use of the terms "a," "an," and the like refers to one or more.

In the following, amounts are given in % by weight (wt. -%) unless it is stated otherwise.

A propylene homopolymer is a polymer that essentially consists of propylene monomer units. Due to impurities especially during commercial polymerization processes, a propylene homopolymer can comprise up to <NUM> mol-% comonomer units, preferably up to <NUM> mol-% comonomer units and most preferably up to <NUM> mol-% comonomer units.

A propylene copolymer is a copolymer of propylene monomer units and comonomer units, preferably selected from ethylene and C<NUM>-C<NUM> alpha-olefins. A propylene random copolymer is a propylene copolymer wherein the comonomer units are randomly distributed along the polymer chain, whilst a propylene block copolymer comprises blocks of propylene monomer units and blocks of comonomer units. Propylene random copolymers can comprise comonomer units from one or more comonomers different in their amounts of carbon atoms.

Heterophasic propylene copolymers typically comprise:.

In case of a random-heterophasic propylene copolymer, said crystalline matrix phase is a random copolymer of propylene and at least one alpha-olefin comonomer.

The elastomeric phase can be a propylene copolymer with a high amount of comonomer that is not randomly distributed in the polymer chain but is distributed in a comonomer-rich block structure and a propylene-rich block structure. A heterophasic polypropylene usually differentiates from a one-phasic propylene copolymer in that it shows two distinct glass transition temperatures Tg which are attributed to the matrix phase and the elastomeric phase.

The present invention will now be described in more detail.

The sealing layer of the present invention comprises at least <NUM> wt. -% of a polypropylene composition (PC), more preferably at least <NUM> wt. -% of the polypropylene composition (PC), yet more preferably at least <NUM> wt. -% of the polypropylene composition (PC), most preferably the polypropylene composition (PC) consists of the polypropylene composition (PC).

The polypropylene composition (PC) comprises the following components:.

The combined amounts of the random-heterophasic propylene-ethylene copolymer (RAHECO), the first propylene-ethylene random copolymer (R-PP1) and the second propylene-ethylene random copolymer (R-PP2) are at least <NUM> wt. -%, more preferably at least <NUM> wt. -%, even more preferably at least <NUM> wt. -%, relative to the total weight of the polypropylene composition (PC).

More preferably, the polypropylene composition (PC) comprises the following components:.

Most preferably, the polypropylene composition (PC) comprises the following components:.

In one particularly preferred embodiment, the polypropylene composition (PC) comprises the following components:.

In an alternative embodiment, the polypropylene composition (PC) comprises the following components:.

In another alternative embodiment, the polypropylene composition (PC) comprises the following components:.

If components other than the random-heterophasic propylene-ethylene copolymer (RAHECO), the first propylene-ethylene random copolymer (R-PP1), and the second propylene-ethylene random copolymer (R-PP2) are present, it is preferred that these are additives.

The skilled practitioner would be able to select suitable additives that are well known in the art.

The additives are preferably selected from pigments, antioxidants, UV-stabilisers, anti-scratch agents, mold release agents, acid scavengers, lubricants, anti-static agents, and mixtures thereof.

It is understood that the content of additives includes any carrier polymers used to introduce the additives to the polypropylene composition (PC), i.e. masterbatch carrier polymers. An example of such a carrier polymer would be a polypropylene homopolymer in the form of powder.

The individual components will now be described in more detail.

The random-heterophasic propylene-ethylene copolymer (RAHECO) is provided in an amount in the range from <NUM> to <NUM> wt. -%, more preferably in the range from <NUM> to <NUM> wt. -%, most preferably in the range from <NUM> to <NUM> wt. -%, relative to the total weight of the polypropylene composition (PC).

The random-heterophasic propylene-ethylene copolymer (RAHECO) comprises:.

The random-heterophasic propylene-ethylene copolymer (RAHECO) has a melt flow rate (MFR<NUM>), determined according to ISO <NUM> at <NUM> and <NUM>, in the range from <NUM> to <NUM>/<NUM>, more preferably in the range from <NUM> to <NUM>/<NUM>, most preferably in the range from <NUM> to <NUM>/<NUM>.

The random-heterophasic propylene-ethylene copolymer (RAHECO) preferably has a melting temperature (Tm), determined by differential scanning calorimetry (DSC), in the range from <NUM> to <NUM>, more preferably in the range from <NUM> to <NUM>, most preferably in the range from <NUM> to <NUM>.

The crystalline matrix (M) of the random-heterophasic propylene-ethylene copolymer (RAHECO) is preferably free of <NUM>,<NUM>-regiodefects, as determined by <NUM>C-NMR spectroscopy.

Being free of <NUM>,<NUM>-regiodefects is an indication that the random-heterophasic propylene-ethylene copolymer (RAHECO) has been polymerized in the presence of a Ziegler-Natta catalyst.

Therefore, it is further preferred that the random-heterophasic propylene-ethylene copolymer (RAHECO) has been polymerized in the presence of a Ziegler-Natta catalyst.

The random-heterophasic propylene-ethylene copolymer (RAHECO) preferably has an ethylene content (C2(total)), determined by FT-IR spectroscopy calibrated by quantitative <NUM>C-NMR spectroscopy in the CRYSTEX QC method, in the range from <NUM> to <NUM> wt. -%, more preferably in the range from <NUM> to <NUM> wt. -%, most preferably in the range from <NUM> to <NUM> wt.

The polymeric part of the random-heterophasic propylene-ethylene copolymer (RAHECO) may be characterized according to the CRYSTEX QC method using trichlorobenzene (TCB) as a solvent. This method is described below in the determination methods section. The crystalline fraction (CF) contains for the most part the matrix phase and only a small part of the elastomeric phase and the soluble fraction (SF) contains for the most part the elastomeric phase and only a small part of the matrix phase. In some cases, this method results in more useful data, since the crystalline fraction (CF) and the soluble fraction (SF) more accurately correspond to the matrix and elastomeric phases respectively. Due to the differences in the separation methods of xylene extraction and CRYSTEX QC method the properties of XCS/XCI fractions on the one hand and crystalline/soluble (CF/SF) fractions on the other hand are not exactly the same, meaning that the amounts of matrix phase and elastomeric phase can differ as well as the properties.

The random-heterophasic propylene-ethylene copolymer (RAHECO) preferably has a soluble fraction (SF) content, determined according to CRYSTEX QC analysis, in the range from <NUM> to <NUM> wt. -%, more preferably in the range from <NUM> to <NUM> wt. -%, most preferably in the range from <NUM> to <NUM> wt.

The random-heterophasic propylene-ethylene copolymer (RAHECO) preferably has an ethylene content of the soluble fraction (C2(SF)), according to CRYSTEX QC analysis, determined by FT-IR spectroscopy calibrated by quantitative <NUM>C-NMR spectroscopy in the CRYSTEX QC method, in the range from <NUM> to <NUM> wt. -%, more preferably in the range from <NUM> to <NUM> wt. -%, most preferably in the range from <NUM> to <NUM> wt.

The random-heterophasic propylene-ethylene copolymer (RAHECO) preferably has an intrinsic viscosity, determined according to DIN ISO <NUM>/<NUM>, of the soluble fraction (iV(SF)), according to CRYSTEX QC analysis, in the range from <NUM> to <NUM> dL/g, more preferably in the range from <NUM> to <NUM> dL/g, most preferably in the range from <NUM> to <NUM> dL/g.

The random-heterophasic propylene-ethylene copolymer (RAHECO) preferably has a crystalline fraction (CF) content, determined according to CRYSTEX QC analysis, in the range from <NUM> to <NUM> wt. -%, more preferably in the range from <NUM> to <NUM> wt. -%, most preferably in the range from <NUM> to <NUM> wt.

The random-heterophasic propylene-ethylene copolymer (RAHECO) preferably has an ethylene content of the crystalline fraction (C2(CF)), according to CRYSTEX QC analysis, determined by FT-IR spectroscopy calibrated by quantitative <NUM>C-NMR spectroscopy in the CRYSTEX QC method, in the range from <NUM> to <NUM> wt. -%, more preferably in the range from <NUM> to <NUM> wt. -%, most preferably in the range from <NUM> to <NUM> wt.

The random-heterophasic propylene-ethylene copolymer (RAHECO) preferably has an intrinsic viscosity, determined according to DIN ISO <NUM>/<NUM>, of the crystalline fraction (iV(CF)), according to CRYSTEX QC analysis, in the range from <NUM> to <NUM> dL/g, more preferably in the range from <NUM> to <NUM> dL/g, most preferably in the range from <NUM> to <NUM> dL/g.

It is also preferred that the ratio of the intrinsic viscosity of the soluble and crystalline fractions, (iV(SF)/iV(CF)), determined according to DIN ISO <NUM>/<NUM>, is in the range from <NUM> to <NUM>, more preferably in the range from <NUM> to <NUM>, most preferably in the range from <NUM> to <NUM>.

The first propylene-ethylene random copolymer (R-PP1) is present in the polypropylene composition (PC) in an amount in the range from <NUM> to <NUM> wt. -%, more preferably from <NUM> to <NUM> wt. -%, most preferably from <NUM> to <NUM> wt. -%, relative to the total weight of the polypropylene composition (PC).

As would be understood by the person skilled in the art, in contrast to the random-heterophasic propylene-ethylene copolymer (RAHECO), the first propylene-ethylene random copolymer (R-PP1) is monophasic.

The first propylene-ethylene random copolymer (R-PP1) is a random copolymer with propylene monomer units and ethylene comonomer units.

The first propylene-ethylene random copolymer (R-PP1) has a melt flow rate (MFR<NUM>), determined according to ISO <NUM> at <NUM> and <NUM>, in the range from <NUM> to <NUM>/<NUM>, more preferably in the range from <NUM> to <NUM>/<NUM>, most preferably in the range from <NUM> to <NUM>/<NUM>.

The first propylene-ethylene random copolymer (R-PP1) preferably has an ethylene content (C2), determined by quantitative <NUM>C-NMR spectroscopy, in the range from <NUM> to <NUM> wt. -%, more preferably in the range from <NUM> to <NUM> wt. -%, most preferably in the range from <NUM> to <NUM> wt.

The first propylene-ethylene random copolymer (R-PP1) preferably has a xylene cold soluble (XCS) content, determined according to ISO <NUM> analysis, in the range from <NUM> to <NUM> wt. -%, more preferably in the range from <NUM> to <NUM> wt. -%, most preferably in the range from <NUM> to <NUM> wt.

The first propylene-ethylene random copolymer (R-PP1) preferably has a melting temperature (Tm), determined by differential scanning calorimetry (DSC), in the range from <NUM> to <NUM>, more preferably in the range from <NUM> to <NUM>, most preferably in the range from <NUM> to <NUM>.

The first propylene-ethylene random copolymer (R-PP1) preferably has a crystallization temperature (Tc), determined by differential scanning calorimetry (DSC), in the range from <NUM> to <NUM>, more preferably in the range from <NUM> to <NUM>, most preferably in the range from <NUM> to <NUM>.

The first propylene-ethylene random copolymer (R-PP1) preferably has a content of <NUM>,<NUM>-regiodefects, as determined by <NUM>C-NMR spectroscopy, in the range from <NUM> to <NUM> mol-%, more preferably in the range from <NUM> to <NUM> mol-%, most preferably in the range from <NUM> to <NUM> mol-%.

The presence of <NUM>,<NUM>-regiodefects is an indication that the first propylene-ethylene random copolymer (R-PP1) has been polymerized in the presence of a single site catalyst (SSC).

Therefore, it is further preferred that the first propylene-ethylene random copolymer (R-PP1) has been polymerized in the presence of a single site catalyst (SSC).

The second propylene-ethylene random copolymer (R-PP2) is present in the polypropylene composition (PC) in an amount in the range from <NUM> to <NUM> wt. -%, more preferably from <NUM> to <NUM> wt. -%, most preferably from <NUM> to <NUM> wt. -%, relative to the total weight of the polypropylene composition (PC).

As would be understood by the person skilled in the art, in contrast to the random-heterophasic propylene-ethylene copolymer (RAHECO), the second propylene-ethylene random copolymer (R-PP2) is monophasic.

The second propylene-ethylene random copolymer (R-PP2) is a random copolymer with propylene monomer units and ethylene comonomer units.

The second propylene-ethylene random copolymer (R-PP2) has a melt flow rate (MFR<NUM>), determined according to ISO <NUM> at <NUM> and <NUM>, in the range from <NUM> to <NUM>/<NUM>, more preferably in the range from <NUM> to <NUM>/<NUM>, most preferably in the range from <NUM> to <NUM>/<NUM>.

The second propylene-ethylene random copolymer (R-PP2) preferably has an ethylene content (C2), determined by quantitative <NUM>C-NMR spectroscopy, in the range from <NUM> to <NUM> wt. -%, more preferably in the range from <NUM> to <NUM> wt. -%, most preferably in the range from <NUM> to <NUM> wt.

The second propylene-ethylene random copolymer (R-PP2) preferably has a xylene cold soluble (XCS) content, determined according to ISO <NUM> analysis, in the range from <NUM> to <NUM> wt. -%, more preferably in the range from <NUM> to <NUM> wt. -%, most preferably in the range from <NUM> to <NUM> wt.

The second propylene-ethylene random copolymer (R-PP2) preferably has a melting temperature (Tm), determined by differential scanning calorimetry (DSC), in the range from <NUM> to <NUM>, more preferably in the range from <NUM> to <NUM>, most preferably in the range from <NUM> to <NUM>.

The second propylene-ethylene random copolymer (R-PP2) preferably has a crystallization temperature (Tc), determined by differential scanning calorimetry (DSC), in the range from <NUM> to <NUM>, more preferably in the range from <NUM> to <NUM>, most preferably in the range from <NUM> to <NUM>.

The second propylene-ethylene random copolymer (R-PP2) preferably has a content of <NUM>,<NUM>-regiodefects, as determined by <NUM>C-NMR spectroscopy, in the range from <NUM> to <NUM> mol-%, more preferably in the range from <NUM> to <NUM> mol-%, most preferably in the range from <NUM> to <NUM> mol-%.

The presence of <NUM>,<NUM>-regiodefects is an indication that the second propylene-ethylene random copolymer (R-PP2) has been polymerized in the presence of a single site catalyst (SSC).

Therefore, it is further preferred that the second propylene-ethylene random copolymer (R-PP2) has been polymerized in the presence of a single site catalyst (SSC).

The skin layer (A) and the core layer (B) each comprise at least <NUM> wt. -%, more preferably at least <NUM> wt. -%, most preferably at least <NUM> wt. -%, of a polypropylene or mixture of polypropylenes.

The compositions of skin layer (A) and of core layer (B) may be the same or different. Preferably, the composition of skin layer (A) is the same as the composition of core layer (B).

In the broadest sense, any polypropylene may be used for the skin layer (A) and core layer (B).

It is however, preferred that the skin layer (A) comprises at least <NUM> wt. -%, more preferably at least <NUM> wt. -%, most preferably at least <NUM> wt. -%, of a heterophasic propylene-ethylene copolymer or a mixture of heterophasic propylene-ethylene copolymers.

Likewise, it is preferred that the core layer (B) comprises at least <NUM> wt. -%, more preferably at least <NUM> wt. -%, most preferably at least <NUM> wt. -%, of a heterophasic propylene-ethylene copolymer or a mixture of heterophasic propylene-ethylene copolymers.

It is particularly preferred that the skin layer (A) comprises at least <NUM> wt. -%, more preferably at least <NUM> wt. -%, most preferably at least <NUM> wt. -%, of a polypropylene composition (PC') that comprises:.

The combined amounts of the random-heterophasic propylene-ethylene copolymer (RAHECO') and the heterophasic propylene-ethylene copolymer (HECO) are at least <NUM> wt. -%, more preferably at least <NUM> wt. -%, most preferably at least <NUM> wt. -%, relative to the total weight of the polypropylene composition (PC').

More preferably, the polypropylene composition (PC') comprises:.

It is likewise particularly preferred that the core layer (B) comprises at least <NUM> wt. -%, more preferably at least <NUM> wt. -%, most preferably at least <NUM> wt. -%, of a polypropylene composition (PC') that comprises:.

More preferably, the polypropylene composition (PC') of the core layer (B) comprises:.

If components other than the random-heterophasic propylene-ethylene copolymer (RAHECO'), and the heterophasic propylene-ethylene copolymer (HECO) are present, it is preferred that these are additives.

It is understood that the content of additives includes any carrier polymers used to introduce the additives to the polypropylene composition (PC'), i.e. masterbatch carrier polymers. An example of such a carrier polymer would be a polypropylene homopolymer in the form of powder.

The random-heterophasic propylene-ethylene copolymer (RAHECO') is provided in an amount in the range from <NUM> to <NUM> wt. -%, more preferably in the range from <NUM> to <NUM> wt. -%, most preferably in the range from <NUM> to <NUM> wt. -%, relative to the total weight of the polypropylene composition (PC').

The random-heterophasic propylene-ethylene copolymer (RAHECO') comprises:.

The random-heterophasic propylene-ethylene copolymer (RAHECO') preferably has a melt flow rate (MFR<NUM>), determined according to ISO <NUM> at <NUM> and <NUM>, in the range from <NUM> to <NUM>/<NUM>, more preferably in the range from <NUM> to <NUM>/<NUM>, most preferably in the range from <NUM> to <NUM>/<NUM>.

The random-heterophasic propylene-ethylene copolymer (RAHECO') has a melting temperature (Tm), determined by differential scanning calorimetry (DSC), in the range from <NUM> to <NUM>, more preferably in the range from <NUM> to <NUM>, most preferably in the range from <NUM> to <NUM>.

The crystalline matrix (M) of the random-heterophasic propylene-ethylene copolymer (RAHECO') is preferably free of <NUM>,<NUM>-regiodefects, as determined by <NUM>C-NMR spectroscopy.

Being free of <NUM>,<NUM>-regiodefects is an indication that the random-heterophasic propylene-ethylene copolymer (RAHECO') has been polymerized in the presence of a Ziegler-Natta catalyst.

Therefore, it is further preferred that the random-heterophasic propylene-ethylene copolymer (RAHECO') has been polymerized in the presence of a Ziegler-Natta catalyst.

The random-heterophasic propylene-ethylene copolymer (RAHECO') preferably has an ethylene content (C2(total)), determined by FT-IR spectroscopy calibrated by quantitative <NUM>C-NMR spectroscopy in the CRYSTEX QC method, in the range from <NUM> to <NUM> wt. -%, more preferably in the range from <NUM> to <NUM> wt. -%, most preferably in the range from <NUM> to <NUM> wt.

The random-heterophasic propylene-ethylene copolymer (RAHECO') preferably has a soluble fraction (SF) content, determined according to CRYSTEX QC analysis, in the range from <NUM> to <NUM> wt. -%, more preferably in the range from <NUM> to <NUM> wt. -%, most preferably in the range from <NUM> to <NUM> wt.

The random-heterophasic propylene-ethylene copolymer (RAHECO') preferably has an ethylene content of the soluble fraction (C2(SF)), according to CRYSTEX QC analysis, determined by FT-IR spectroscopy calibrated by quantitative <NUM>C-NMR spectroscopy in the CRYSTEX QC method, in the range from <NUM> to <NUM> wt. -%, more preferably in the range from <NUM> to <NUM> wt. -%, most preferably in the range from <NUM> to <NUM> wt.

The random-heterophasic propylene-ethylene copolymer (RAHECO') preferably has an intrinsic viscosity, determined according to DIN ISO <NUM>/<NUM>, of the soluble fraction (iV(SF)), according to CRYSTEX QC analysis, in the range from <NUM> to <NUM> dL/g, more preferably in the range from <NUM> to <NUM> dL/g, most preferably in the range from <NUM> to <NUM> dL/g.

The random-heterophasic propylene-ethylene copolymer (RAHECO') preferably has a crystalline fraction (CF) content, determined according to CRYSTEX QC analysis, in the range from <NUM> to <NUM> wt. -%, more preferably in the range from <NUM> to <NUM> wt. -%, most preferably in the range from <NUM> to <NUM> wt.

The random-heterophasic propylene-ethylene copolymer (RAHECO') preferably has an ethylene content of the crystalline fraction (C2(CF)), according to CRYSTEX QC analysis, determined by FT-IR spectroscopy calibrated by quantitative <NUM>C-NMR spectroscopy in the CRYSTEX QC method, in the range from <NUM> to <NUM> wt. -%, more preferably in the range from <NUM> to <NUM> wt. -%, most preferably in the range from <NUM> to <NUM> wt.

The random-heterophasic propylene-ethylene copolymer (RAHECO') preferably has an intrinsic viscosity, determined according to DIN ISO <NUM>/<NUM>, of the crystalline fraction (iV(CF)), according to CRYSTEX QC analysis, in the range from <NUM> to <NUM> dL/g, more preferably in the range from <NUM> to <NUM> dL/g, most preferably in the range from <NUM> to <NUM> dL/g.

It is particularly preferred that the random-heterophasic propylene-ethylene copolymer (RAHECO') of the polypropylene composition (PC') of the skin and/or core layer is the same as the random-heterophasic propylene-ethylene copolymer (RAHECO) of the polypropylene composition (PC) of the sealing layer.

The heterophasic propylene-ethylene copolymer (HECO) is provided in an amount in the range from <NUM> to <NUM> wt. -%, more preferably in the range from <NUM> to <NUM> wt. -%, most preferably in the range from <NUM> to <NUM> wt. -%, relative to the total weight of the polypropylene composition (PC').

The heterophasic propylene-ethylene copolymer (HECO) comprises:.

The heterophasic propylene-ethylene copolymer (HECO) preferably has a melt flow rate (MFR<NUM>), determined according to ISO <NUM> at <NUM> and <NUM>, in the range from <NUM> to <NUM>/<NUM>, more preferably in the range from <NUM> to <NUM>/<NUM>, most preferably in the range from <NUM> to <NUM>/<NUM>.

The heterophasic propylene-ethylene copolymer (HECO) has a melting temperature (Tm), determined by differential scanning calorimetry (DSC), in the range from <NUM> to <NUM>, more preferably in the range from <NUM> to <NUM>, most preferably in the range from <NUM> to <NUM>.

The crystalline matrix (M) of the heterophasic propylene-ethylene copolymer (HECO) is preferably free of <NUM>,<NUM>-regiodefects, as determined by <NUM>C-NMR spectroscopy.

Being free of <NUM>,<NUM>-regiodefects is an indication that the heterophasic propylene-ethylene copolymer (HECO) has been polymerized in the presence of a Ziegler-Natta catalyst.

Therefore, it is further preferred that the heterophasic propylene-ethylene copolymer (HECO) has been polymerized in the presence of a Ziegler-Natta catalyst.

The heterophasic propylene-ethylene copolymer (HECO) preferably has an ethylene content (C2(total)), determined by FT-IR spectroscopy calibrated by quantitative <NUM>C-NMR spectroscopy in the CRYSTEX QC method, in the range from <NUM> to <NUM> wt. -%, more preferably in the range from <NUM> to <NUM> wt. -%, most preferably in the range from <NUM> to <NUM> wt.

The heterophasic propylene-ethylene copolymer (HECO) preferably has a soluble fraction (SF) content, determined according to CRYSTEX QC analysis, in the range from <NUM> to <NUM> wt. -%, more preferably in the range from <NUM> to <NUM> wt. -%, most preferably in the range from <NUM> to <NUM> wt.

The heterophasic propylene-ethylene copolymer (HECO) preferably has an ethylene content of the soluble fraction (C2(SF)), according to CRYSTEX QC analysis, determined by FT-IR spectroscopy calibrated by quantitative <NUM>C-NMR spectroscopy in the CRYSTEX QC method, in the range from <NUM> to <NUM> wt. -%, more preferably in the range from <NUM> to <NUM> wt. -%, most preferably in the range from <NUM> to <NUM> wt.

The heterophasic propylene-ethylene copolymer (HECO) preferably has an intrinsic viscosity, determined according to DIN ISO <NUM>/<NUM>, of the soluble fraction (iV(SF)), according to CRYSTEX QC analysis, in the range from <NUM> to <NUM> dL/g, more preferably in the range from <NUM> to <NUM> dL/g, most preferably in the range from <NUM> to <NUM> dL/g.

The heterophasic propylene-ethylene copolymer (HECO) preferably has a crystalline fraction (CF) content, determined according to CRYSTEX QC analysis, in the range from <NUM> to <NUM> wt. -%, more preferably in the range from <NUM> to <NUM> wt. -%, most preferably in the range from <NUM> to <NUM> wt.

The first heterophasic propylene-ethylene copolymer (HECO) preferably has an ethylene content of the crystalline fraction (C2(CF)), according to CRYSTEX QC analysis, determined by FT-IR spectroscopy calibrated by quantitative <NUM>C-NMR spectroscopy in the CRYSTEX QC method, in the range from <NUM> to <NUM> wt. -%, more preferably in the range from <NUM> to <NUM> wt. -%, most preferably in the range from <NUM> to <NUM> wt.

The heterophasic propylene-ethylene copolymer (HECO) preferably has an intrinsic viscosity, determined according to DIN ISO <NUM>/<NUM>, of the crystalline fraction (iV(CF)), according to CRYSTEX QC analysis, in the range from <NUM> to <NUM> dL/g, more preferably in the range from <NUM> to <NUM> dL/g, most preferably in the range from <NUM> to <NUM> dL/g.

As described above, the multilayer film (F) comprises, in the given order, the following layers:.

Although other layers may be present, it is preferred that any further layers, if present, are between the skin layer (A) and the core layer (B) or between the core layer (B) and between the sealing layer (C), most preferably between the skin layer (A) and the core layer (B).

It is particularly preferred that no further layers are present, i.e. that the multilayer film (F) is a <NUM>-layer film, consisting of layers (A), (B) and (C).

It is preferred that the multilayer film (F) has a thickness in the range from <NUM> to <NUM>, more preferably <NUM> to <NUM>, most preferably <NUM> to <NUM>.

It is preferred that the multilayer film (F) has a tensile modulus in the machine direction (TM-MD), measured according to ISO <NUM>-<NUM>, in the range from <NUM> to <NUM> MPa, more preferably in the range from <NUM> to <NUM> MPa, most preferably in the range from <NUM> to <NUM> MPa.

It is preferred that the multilayer film (F) has a tensile modulus in the transverse direction (TM-TD), measured according to ISO <NUM>-<NUM>, in the range from <NUM> to <NUM> MPa, more preferably in the range from <NUM> to <NUM> MPa, most preferably in the range from <NUM> to <NUM> MPa.

It is preferred that the multilayer film (F) has a dart drop impact strength (DDI), measured according to ISO <NUM>-<NUM>, in the range from <NUM> to <NUM>, more preferably in the range from <NUM> to <NUM>, most preferably in the range from <NUM> to <NUM>.

It is preferred that the multilayer film (F) has a haze value, determined according to ASTM D1003, in the range from <NUM> to <NUM>%, more preferably in the range from <NUM> to <NUM>%, most preferably in the range from <NUM> to <NUM>%.

It is preferred that the multilayer film (F) has a sealing initiation temperature (SIT), determined according to the method specified in the measurement methods, in the range from <NUM> to <NUM>, more preferably in the range from <NUM> to <NUM>, most preferably in the range from <NUM> to <NUM>.

It is preferred that the multilayer film (F) has a seal strength before sterilization (b. ), determined according to the method specified in the measurement methods, in the range from <NUM> to <NUM> N/mm, more preferably in the range from <NUM> to <NUM> N/mm, most preferably in the range from <NUM> to <NUM> N/mm.

It is preferred that the multilayer film (F) has a seal strength after sterilization (a. ) determined according to the method specified in the measurement methods, in the range from <NUM> to <NUM> N/mm, more preferably in the range from <NUM> to <NUM> N/mm, most preferably in the range from <NUM> to <NUM> N/mm.

It is also preferred that the multilayer film (F) has a seal strength after sterilization (a. ) that is at least <NUM>%, more preferably at least <NUM>%, most preferably at least <NUM>%, of the seal strength before sterilization (b. ), both determined according to the method specified in the measurement methods.

The seal strength after sterilization (a. ) is typically not more than <NUM>% of the seal strength before sterliziation.

The following definitions of terms and determination methods apply for the above general description of the invention including the claims as well as to the below examples unless otherwise defined.

Quantitative <NUM>C{<NUM>H} NMR spectra recorded in the molten-state using a Bruker Avance III <NUM> NMR spectrometer operating at <NUM> and <NUM> for <NUM>H and <NUM>C respectively. All spectra were recorded using a <NUM>C optimised <NUM> magic-angle spinning (MAS) probehead at <NUM> using nitrogen gas for all pneumatics. Approximately <NUM> of material was packed into a <NUM> outer diameter zirconia MAS rotor and spun at <NUM>. This setup was chosen primarily for the high sensitivity needed for rapid identification and accurate quantification {klimke06, parkinson07, castignolles09}. Standard single-pulse excitation was employed utilising the NOE at short recycle delays of <NUM> {pollard04, klimke06} and the RS-HEPT decoupling scheme {fillip05,griffin07}. A total of <NUM> (<NUM>) transients were acquired per spectra.

Quantitative <NUM>C{<NUM>H} NMR spectra were processed, integrated and relevant quantitative properties determined from the integrals. All chemical shifts are internally referenced to the methyl isotactic pentad (mmmm) at <NUM> ppm.

Characteristic signals corresponding to the incorporation of <NUM>-butene were observed {brandolini01} and the comonomer content quantified.

The amount of isolated <NUM>-butene incorporated in PBP sequences was quantified using the integral of the αB2 sites at <NUM> ppm accounting for the number of reporting sites per comonomer: <MAT>.

The amount of consecutively incorporated <NUM>-butene in PBBP sequences was quantified using the integral of the ααB2B2 site at <NUM> ppm accounting for the number of reporting sites per comonomer: <MAT>.

In presence of BB the value of B must be corrected for the influence of the αB2 sites resulting from BB: <MAT>.

The total <NUM>-butene content was calculated based on the sum of isolated and consecutively incorporated <NUM>-butene: <MAT>.

Characteristic signals corresponding to the incorporation of ethylene were observed {brandolini01} and the comonomer content quantified.

The amount of isolated ethylene incorporated in PEP sequences was quantified using the integral of the Sββ sites at <NUM> ppm accounting for the number of reporting sites per comonomer: <MAT>.

If characteristic signals corresponding to consecutive incorporation of ethylene in PEE sequence was observed the Sβδ site at <NUM> ppm was used for quantification: <MAT>.

Characteristic signals corresponding to regiodefects were observed {resconi00}. The presence of isolated <NUM>,<NUM>-erythro regiodefects was indicated by the presence of the two methyl sites at <NUM> and <NUM> ppm, by the methylene site at <NUM> ppm and confirmed by other characteristic sites. The presence of <NUM>,<NUM> regiodefect adjacent an ethylene unit was indicated by the two inequivalent Sαβ signals at <NUM> ppm and <NUM> ppm respectively and the Tγγ at <NUM> ppm.

The amount of isolated <NUM>,<NUM>-erythro regiodefects (P21e isolated) was quantified using the integral of the methylene site at <NUM> ppm (Ie9): <MAT>.

If present the amount of <NUM>,<NUM> regiodefect adjacent to ethylene (PE21) was quantified using the methine site at <NUM> ppm (ITγγ): <MAT>.

The total ethylene content was then calculated based on the sum of ethylene from isolated, consecutively incorporated and adjacent to <NUM>,<NUM> regiodefects: <MAT>.

The amount of propylene was quantified based on the Sαα methylene sites at <NUM> ppm including all additional propylene units not covered by Sαα e.g. the factor <NUM>*P21e isolated accounts for the three missing propylene units from isolated <NUM>,<NUM>-erythro regiodefects: <MAT>.

The total mole fraction of <NUM>-butene and ethylene in the polymer was then calculated as: <MAT> <MAT>.

The mole percent comonomer incorporation was calculated from the mole fractions: <MAT> <MAT>.

The weight percent comonomer incorporation was calculated from the mole fractions: <MAT> <MAT>.

The mole percent of isolated <NUM>,<NUM>-erythro regiodefects was quantified with respect to all propylene: <MAT>.

The mole percent of <NUM>,<NUM> regiodefects adjacent to ethylene was quantified with respect to all propylene: <MAT>.

The total amount of <NUM>,<NUM> defects was quantified as following: <MAT>.

Characteristic signals corresponding to other types of regiodefects (<NUM>,<NUM>-threo, <NUM>,<NUM> insertion) were not observed {resconi00}.

The crystalline (CF) and soluble fractions (SF) of the polypropylene (PP) compositions as well as the comonomer content and intrinsic viscosities of the respective fractions were analyzed by use of the CRYSTEX instrument, Polymer Char (Valencia, Spain). Details of the technique and the method can be found in literature (Ljiljana Jeremic, Andreas Albrecht, Martina Sandholzer & Markus Gahleitner (<NUM>) Rapid characterization of high-impact ethylene-propylene copolymer composition by crystallization extraction separation: comparability to standard separation methods, <NPL>).

The crystalline and amorphous fractions are separated through temperature cycles of dissolution at <NUM>, crystallization at <NUM> and re-dissolution in <NUM>,<NUM>,<NUM>-trichlorobenzene at <NUM>. Quantification of SF and CF and determination of ethylene content (C2) are achieved by means of an integrated infrared detector (IR4) and for the determination of the intrinsic viscosity (IV) an online <NUM>-capillary viscometer is used.

The IR4 detector is a multiple wavelength detector measuring IR absorbance at two different bands (CH<NUM> stretching vibration (centred at app. <NUM>-<NUM>) and the CH stretching vibration (<NUM>-<NUM>-<NUM>) that are serving for the determination of the concentration and the Ethylene content in Ethylene-Propylene copolymers. The IR4 detector is calibrated with series of <NUM> EP copolymers with known Ethylene content in the range of <NUM> wt. -% to <NUM> wt. -% (determined by <NUM>C-NMR) and each at various concentrations, in the range of <NUM> and <NUM>/ml. To encounter for both features, concentration and ethylene content at the same time for various polymer concentrations expected during Crystex analyses the following calibration equations were applied: <MAT> <MAT>.

The constants a to e for equation <NUM> and a to f for equation <NUM> were determined by using least square regression analysis.

The CH<NUM>/1000C is converted to the ethylene content in wt. -% using following relationship: <MAT>.

Amounts of Soluble Fraction (SF) and Crystalline Fraction (CF) are correlated through the XS calibration to the "Xylene Cold Soluble" (XCS) quantity and respectively Xylene Cold Insoluble (XCI) fractions, determined according to standard gravimetric method as per ISO16152. XS calibration is achieved by testing various EP copolymers with XS content in the range <NUM>-<NUM> wt. The determined XS calibration is linear: <MAT>.

Intrinsic viscosity (IV) of the parent EP copolymer and its soluble and crystalline fractions are determined with a use of an online <NUM>-capillary viscometer and are correlated to corresponding IV's determined by standard method in decalin according to ISO <NUM>-<NUM>. Calibration is achieved with various EP PP copolymers with IV = <NUM>-<NUM> dL/g. The determined calibration curve is linear: <MAT>.

The samples to be analyzed are weighed out in concentrations of <NUM>/ml to <NUM>/ml. To avoid injecting possible gels and/or polymers which do not dissolve in TCB at <NUM>, like PET and PA, the weighed out sample was packed into a stainless steel mesh MW <NUM>,<NUM>/D <NUM>,05mmm.

After automated filling of the vial with <NUM>,<NUM>,<NUM>-TCB containing <NUM>/<NUM><NUM>,<NUM>-tert-butyl-<NUM>-methylphenol (BHT) as antioxidant, the sample is dissolved at <NUM> until complete dissolution is achieved, usually for <NUM>, with constant stirring of 400rpm. To avoid sample degradation, the polymer solution is blanketed with the N2 atmosphere during dissolution.

A defined volume of the sample solution is injected into the column filled with inert support where the crystallization of the sample and separation of the soluble fraction from the crystalline part is taking place. This process is repeated two times. During the first injection the whole sample is measured at high temperature, determining the IV[dl/g] and the C2[wt. %] of the PP composition. During the second injection the soluble fraction (at low temperature) and the crystalline fraction (at high temperature) with the crystallization cycle are measured (wt. -% C2, IV).

The intrinsic viscosity (iV) was measured according to DIN ISO <NUM>/<NUM>, October <NUM>, in Decalin at <NUM>.

The melt flow rate (MFR) was determined according to ISO <NUM> and is indicated in g/<NUM>. The MFR is an indication of the flowability, and hence the processability, of the polymer. The higher the melt flow rate, the lower the viscosity of the polymer. The MFR<NUM> of polypropylene was determined at a temperature of <NUM> and a load of <NUM>.

The density was measured according to ISO <NUM>-<NUM>. Sample preparation was done by compression moulding in accordance with ISO <NUM>-<NUM>:<NUM>.

The xylene soluble fraction at room temperature (XCS, wt. -%): The amount of the polymer soluble in xylene was determined at <NUM> according to ISO <NUM>; <NUM>th edition; <NUM>-<NUM>-<NUM>.

DSC analysis, melting temperature (Tm) and heat of fusion (Hf), crystallization temperature (Tc) and heat of crystallization (Hc): measured with a TA Instrument Q200 differential scanning calorimetry (DSC) on <NUM> to <NUM> samples. DSC was run according to ISO <NUM> / part <NUM> /method C2 in a heat / cool / heat cycle with a scan rate of <NUM>/min in the temperature range of -<NUM> to +<NUM>. Crystallization temperature (Tc) and crystallization enthalpy (Hc) were determined from the cooling step, while melting temperature (Tm) and melting enthalpy (Hm) were determined from the second heating step.

This test method covers the determination of the energy that causes films to fail under specified conditions of impact of a free-falling dart from a specified height that would result in failure of <NUM> % of the specimens tested (Staircase method A). A uniform missile mass increment is employed during the test and the missile weight is decreased or increased by the uniform increment after test of each specimen, depending upon the result (failure or no failure) observed for the specimen.

Testing according to ISO7765-<NUM>:<NUM> / Method A was carried out on films with a thickness as indicated and produced as described below under "Examples" and reported in gram (g).

DDI per unit thickness (in g/micron) is calculated by dividing DDI (in gram) to the thickness of film (in micron).

Haze was determined according to ASTM D1003-<NUM> directly on the multilayer film produced in the experimental section.

This method is used to determine the sealing window (sealing temperature range) of films. The procedure is similar to Hot-Tack test and is conducted in the same machine. In contrast to Hot-Tack, the sealing range determined corresponds to the strength of the seal after it had cooled down (a delay time of <NUM>). The conditions used are as follows:.

The determined results provide a quantitatively useful indication of the sealing strength of the films and indicate the temperature range for optimal sealing.

The lower limit (Sealing Initiation Temperature - SIT) is the sealing temperature at which a sealing average force of <NUM> N is measured (i.e. the lowest temperature at which such force is measured). The upper limit (Sealing End Temperature - SET) is identified as the first sealing temperature where at least two specimens showed a burn-through failure mode. The maximum sealing force corresponds to the highest measured sealing force.

The temperature interval is set by default to <NUM>, but can be reduced to <NUM> when the curve shows a sharp increase or decrease in the force values between two temperature steps. This is done in order to represent a better curve profile.

Deviating from ASTM F1921 - <NUM>, the test parameters sealing pressure, cooling time and test speed are modified. The determination of the force/temperature curve is continued until thermal failure of the film. In addition to failure mode evaluations described in the standard, additional failure modes are used.

The heat-seal experiments were performed on at least <NUM> film specimens of <NUM> wide by <NUM> length cut in the machine direction. The <NUM> x <NUM> Teflon coated steel heating bars were set to a temperature of <NUM>. Two films were sealed by positioning, one on top of the other using a <NUM> sealing time and <NUM> N/ mm<NUM> pressure. The resulting sealed area was <NUM> x <NUM>. The specimens were then conditioned for <NUM> days (± <NUM>) at <NUM> (± <NUM>) / <NUM> % RH (± <NUM>%). <NUM> specimens of <NUM> width were cut and tested in tensile mode at <NUM> (± <NUM>) / <NUM> % RH (± <NUM>%) on a Universal Testing Machine (Zwick Z005). The clamping distance used was <NUM>, and a test speed of <NUM>/min. The yielding force and maximum force were measured for each test specimen.

Tensile modulus in machine and transverse direction was determined according to ISO <NUM>-<NUM> at <NUM> on the multilayer films produced in the experimental section. Testing was performed at a cross-head speed of <NUM>/min.

Steam sterilization was performed in a Systec D series machine (Systec Inc. The samples were heated up at a heating rate of <NUM>/min starting from <NUM>. After having been kept for <NUM> at <NUM>, they were removed immediately from the steam sterilizer and stored at room temperature before being further processed or tested.

For the polymerization process of HECO2, a Ziegler-Natta type catalyst as used in for the inventive examples of <CIT> and prepolymerized with vinylcyclohexane to achieve nucleation with poly(vinylcycloxehane) was used.

Nucleation by prepolymerization with vinylcyclohexane is described in <CIT> and <CIT> in detail.

For the polymerizsation process of RAHECO and HECO <NUM>, the same catalyst was used except that no pre-polymerization with vinylcyclohexane was undertaken (i.e. simply the catalyst used for the inventive examples of <CIT> was used).

The catalyst systems defined above was used in combination with triethyl-aluminium (TEAL) as cocatalyst and dicyclopenta dienyl-dimethoxy silane (Donor D) as external donor.

The subsequent polymerizations have been effected under the following conditions.

The matrices of each of RAHECO, HECO1 and HECO2 are free from <NUM>,<NUM>-regiodefects.

RAHECO was compounded in a co-rotating twin-screw extruder Coperion ZSK <NUM> at <NUM> with <NUM> wt. -% of an antioxidant blend (Irganox B215FF from BASF AG, Germany; this is a <NUM>:<NUM>-mixture of Pentaerythrityl-tetrakis(<NUM>-(<NUM>',<NUM>'-di-tert. butyl-<NUM>-hydroxyphenyl)-propionate, <NPL>, and Tris (<NUM>,<NUM>-di-t-butylphenyl) phosphite, <NPL>); <NUM> wt. -% of Ca-stearate (<NPL>, commercially available from Faci, Italy).

HECO1 was compounded in a co-rotating twin-screw extruder Coperion ZSK <NUM> at <NUM> with <NUM> wt. -% of pentaerythrityl-tetrakis(<NUM>-(<NUM>',<NUM>'-di-tert. butyl-<NUM>-hydroxyphenyl)-propionate (available as Irganox <NUM> from BASF AG, Germany; <NPL>); and <NUM> wt. -% of Ca-stearate (<NPL>, commercially available from Faci, Italy).

HECO2 was compounded in a co-rotating twin-screw extruder Coperion ZSK <NUM> at <NUM> with <NUM> wt. -% of pentaerythrityl-tetrakis(<NUM>-(<NUM>',<NUM>'-di-tert. butyl-<NUM>-hydroxyphenyl)-propionate (available as Irganox <NUM> from BASF AG, Germany; <NPL>); <NUM> wt. -% of tris (<NUM>,<NUM>-di-t-butylphenyl) phosphite (available as Irgafos <NUM> from BASF AG, Germany; <NPL>); <NUM> wt. -% of synthetic hydrotalcite (available as Hycite <NUM> from BASF AG, Germany; <NPL>); and <NUM> wt. -% of a nucleating agent (available as Hyperform HPN-20E from Milliken, USA; <NPL>).

The catalyst used in the polymerization process for the propylene-ethylene random copolymers R-PP1 and R-PP2 was prepared as follows:
The metallocene MC1 (rac-anti-dimethylsilandiyl(<NUM>-methyl-<NUM>-phenyl-<NUM>-methoxy-<NUM>-tert-butyl-indenyl)(<NUM>-methyl-<NUM>-(<NUM>-tert-butylphenyl)indenyl)zirconium dichloride) has been synthesized as described in <CIT>.

The catalyst was prepared using metallocene MC1 and a catalyst system of MAO and trityl tetrakis(pentafluorophenyl)borate according to Catalyst <NUM> of <CIT> with the proviso that the surfactant is <NUM>,<NUM>,<NUM>,<NUM>-tetrafluoro-<NUM>-(<NUM>,<NUM>,<NUM>,<NUM>,<NUM>,<NUM>,<NUM>-heptafluoropropoxy)-<NUM>-propanol.

R-PP1 was compounded in a co-rotating twin-screw extruder Coperion ZSK <NUM> at <NUM> with <NUM> wt. -% of pentaerythrityl-tetrakis(<NUM>-(<NUM>',<NUM>'-di-tert. butyl-<NUM>-hydroxyphenyl)-propionate (available as Irganox <NUM> from BASF AG, Germany; <NPL>); <NUM> wt. -% of tris (<NUM>,<NUM>-di-t-butylphenyl) phosphite (available as Irgafos <NUM> from BASF AG, Germany; <NPL>); <NUM> wt. -% of synthetic hydrotalcite (available as Hycite <NUM> from BASF AG, Germany; <NPL>); and <NUM> wt. -% of a nucleating agent (available as ADK Stab NA-<NUM> from Adeka Corporation, Germany; <NPL>).

R-PP2 was compounded in a co-rotating twin-screw extruder Coperion ZSK <NUM> at <NUM> with <NUM> wt. -% of erucamide (available as Crodamide ER beads from Croda International, UK; <NPL>); <NUM> wt. -% of amorphous silica (available as Sylobloc 45B from Grace GmbH, Germany; <NPL>); <NUM> wt. -% of an antioxidant blend (available as Irganox B215FF from BASF AG, Germany; this is a <NUM>:<NUM>-mixture of Pentaerythrityl-tetrakis(<NUM>-(<NUM>',<NUM>'-di-tert. butyl-<NUM>-hydroxyphenyl)-propionate, <NPL>, and Tris (<NUM>,<NUM>-di-t-butylphenyl) phosphite, CAS-no. <NUM>-<NUM>-<NUM>); and <NUM> wt. -% of Ca-stearate (available from Faci, Italy; <NPL>) and <NUM> wt. -% of the propylene homopolymer described in <CIT>, Table <NUM>, IE2.

Furthermore, R-PP2 was visbroken using <NUM>,<NUM>-bis(tert-butylperoxy)-<NUM>,<NUM>-dimethylhexane to achieve an MFR<NUM> of <NUM>/<NUM>. The XCS, Tm, C2(total) and content of <NUM>,<NUM>-regiodefects were not altered during the visbreaking process.

The compositions for each layer were prepared based on the recipes indicated in Table <NUM> by compounding in a co-rotating twin-screw extruder Coperion ZSK <NUM> at <NUM>.

<NUM>-layer films are produced on Collin lab scale blown film line, film thickness <NUM>, BUR <NUM>:<NUM>, melt temperature <NUM>. The film thickness distribution is skin <NUM>%, core <NUM>%, and sealing layer <NUM>%.

The properties of the inventive and comparative compositions are given in Table <NUM>.

Claim 1:
A multilayer film (F), comprising, in the given order, the following layers:
(A) a skin layer, comprising at least <NUM> wt.-%, based on the total weight of the skin layer, of a polypropylene or mixture of polypropylenes;
(B) a core layer, comprising at least <NUM> wt.-%, based on the total weight of the core layer, of a polypropylene or mixture of polypropylenes; and
(C) a sealing layer, comprising at least <NUM> wt.-%, based on the total weight of the sealing layer, of a polypropylene composition (PC) comprising the following components:
i) <NUM> to <NUM> wt.-%, based on the total weight of the polypropylene composition (PC), of a random-heterophasic propylene-ethylene copolymer (RAHECO), having a melt flow rate (MFR<NUM>), determined according to ISO <NUM> at <NUM> and <NUM>, in the range from <NUM> to <NUM>/<NUM>, comprising:
a) a crystalline matrix (M) being a propylene-ethylene random copolymer; and
b) an amorphous propylene-ethylene elastomer (E);
ii) <NUM> to <NUM> wt.-%, based on the total weight of the polypropylene composition (PC), of a first propylene-ethylene random copolymer (R-PP1) having a melt flow rate (MFR<NUM>), determined according to ISO <NUM> at <NUM> and <NUM>, in the range from <NUM> to <NUM>/<NUM>; and
iii) <NUM> to <NUM> wt.-%, based on the total weight of the polypropylene composition (PC), of a second propylene-ethylene random copolymer (R-PP2) having a melt flow rate (MFR<NUM>), determined according to ISO <NUM> at <NUM> and <NUM>, in the range from <NUM> to <NUM>/<NUM>,
wherein the combined amounts of the random-heterophasic propylene-ethylene copolymer (RAHECO), the first propylene-ethylene random copolymer (R-PP1) and the second propylene-ethylene random copolymer (R-PP2) are at least <NUM> wt.-%, relative to the total weight of the polypropylene composition (PC).