Recyclable polyethylene film for the packaging of hygiene articles

Abstract

The invention relates to a multilayer polyethylene film which comprises or substantially consists of an outer sealing layer (A) comprising an ethylene homopolymer or copolymer (at) and optionally an ethylene homopolymer or copolymer (a2); a middle layer (B) comprising an ethylene homopolymer or copolymer (b1), an ethylene homopolymer or copolymer (b2) and optionally an ethylene homopolymer or copolymer (b3); and an outer sealing layer (C) comprising an ethylene homopolymer or copolymer (c1) and optionally an ethylene homopolymer or copolymer (c2). The polyethylene film has a total layer thickness of at most 50 μm. The middle layer (B) contains, if any at all, a total of less than 15 wt.% of propylene homopolymers or copolymers relative to the total weight of the middle layer (B). Optionally, the sealing layer (A) is at least partially coated with a release coating.

Description

Recyclable polyethylene film for packaging hygiene products

[0001] Priority is claimed from German patent application No. 10 2024 119 437.5, filed on July 9, 2024.

[0002] The invention relates to a multilayer polyethylene film comprising, or essentially consisting of, an outer sealing layer (A) comprising an ethylene homo- or copolymer (ai) and optionally an ethylene homo- or copolymer (a2); a middle layer (B) comprising an ethylene homo- or copolymer (bi), an ethylene homo- or copolymer (b2), and optionally an ethylene homo- or copolymer (b3); and an outer sealing layer (C) comprising an ethylene homo- or copolymer (c) and optionally an ethylene homo- or copolymer (c2). The polyethylene film has a total layer thickness of at most 50 pm. The middle layer (B) contains, if any, less than 15 wt% propylene homo- or copolymers by weight of the middle layer (B). Optionally, the sealing layer (A) is at least partially coated with a release coating.

[0003] Polyolefin films used as packaging for hygiene products are known in various designs.

[0004] EP 1 629 633 concerns coextruded structures for bundle shrink films and mixtures of polyethylene used for this purpose.

[0005] DE 10 2014 010 986 Al relates to a packaging film comprising at least a monoaxially stretched, multilayer, flexible plastic film with a total thickness < 18 pm, preferably < 12 µm, which has an elongation of up to a maximum of 1% at a tensile force of at least 3 N per 25 mm width according to DIN EN ISO 527-3, as packaging material and packaging made therefrom for preferably individually packaged hygiene products or individually packaged incontinence products.

[0006] WO 2017 / 016660 relates to a multilayer polyolefin film comprising a sequence of layers consisting of a sealable layer (a) based on a polyethylene component with a density in the range of 0.910 to 0.940 g / cm³ 3and a melting point in the range of 110 °C to 130 °C, a layer (b) based on a polymer mixture of 51 - 85 wt% of at least one polyethylene with a density of 0.910 to 0.940 g / cm³ 3 and 15 - 49 wt. -%, each based on the total weight of the polymer mixture, at least one propylene homopolymer or copolymer, and a sealable layer (c) based on a polyethylene component with a density in the range of 0.910 to 0.940 g / cm³ 3 and a melting point in the range of 110 °C to 130 °C, wherein the melting point of layer (a) or layer (c) is at least 5 °C lower than the melting point of layer (b); the tear strength of the polyolefin film in the machine direction [MD] is < 5 N and the tear strength transverse to the machine direction [CD] is at least four times higher than in [MD], each- Measure according to DIN 53356; and the tensile strength, measured according to DIN ISO 527-3, in the machine direction [MD] as well as perpendicular to the machine direction [CD] is approximately the same > 15 N.

[0007] WO 2017 / 016661 relates to a packaging film suitable for outer packaging, made of a possibly separable, unstretched, at least single-layer polyolefin film comprising: a) a layer (a) based on a mixture of a) 20-49 wt.% of a polypropylene and / or at least one propylene copolymer and β) 80-51 wt.% of at least one polyethylene or ethylene copolymer, preferably with a melting point of at least 113 °C, and optionally y) customary additives, preferably processing aids, with a layer thickness of < 20 pm, preferably 6-20 pm. and b) optionally on at least one surface of layer (a) a release coating (b) of hardened polysiloxane, wherein the tensile strength of the polyolefin film in the machine direction is at least 6.5 N / cm, measured according to DIN EN ISO 527-3, and outer packaging produced therefrom.

[0008] DE 10 2019 220 381 Al relates to a monoaxially stretched polyolefin film which can be produced by blown film extrusion and subsequent monoaxial stretching. In this process, the tube obtained by blown film extrusion is flattened and thermally bonded to itself during monoaxial stretching.

[0009] WO 2022 / 101299 relates to a process for producing a release film by coating a carrier film with a release coating, comprising the steps of: (a) providing the carrier film, wherein the carrier film has a first surface side and a second surface side; wherein the carrier film is preferably structured; (b) providing a coating composition comprising a solvent component, preferably comprising ethyl acetate, propyl acetate, butyl acetate and / or n-propanol, and a UV-curable silicone system; (c) coating at least a part of the first surface side of the carrier film provided in step (a) with the coating composition provided in step (b); (d) evaporating at least a part of the solvent component; and (e) irradiating at least a part of the first surface side of the carrier film coated in step (c) with UV radiation to cure the silicone system.

[0010] However, the polyolefin films known from the state of the art for the packaging of hygiene products are not satisfactory in every respect, and there is therefore a need for improved polyolefin films.

[0011] Thus, polyolefin films of low total thickness known from the prior art are usually not pure and sometimes contain significant amounts of inorganic fillers, such as chalk. Therefore, such polyolefin films can only be recycled to a very limited extent, if at all. Furthermore, polyolefin films of low total thickness known from the prior art sometimes exhibit poor mechanical properties, are difficult to seal, tend to splinter in the machine direction, and sometimes result in unclean cut or die-cut edges when slicing or punching.

[0012] The invention is based on the objective of providing advantageous polyolefin films with a low overall thickness, suitable as packaging for hygiene products. These polyolefin films should exhibit very good mechanical properties with minimal material usage, be easily processed, and be recyclable.

[0013] This problem is solved by the subject matter of the patent claims.

[0014] It was surprisingly discovered that polyolefin films for packaging hygiene products can be made without propylene homo- and copolymers, and can instead consist exclusively of ethylene homo- and copolymers, without any deterioration in mechanical properties. In fact, some properties are even improved.

[0015] By eliminating propylene homo- and copolymers, pure polyethylene films can be produced. Since the polyethylene films according to the invention can also contain only small amounts of inorganic components, they are particularly recyclable overall.

[0016] It was surprisingly found that the polyolefin films according to the invention exhibit very good tensile strength in the machine direction (MD) at high modulus of elasticity, which is particularly evident from the force values ​​at 1%, 2% and 5%.

[0017] Furthermore, it was surprisingly found that the polyolefin films according to the invention exhibit improved sealing properties, as evidenced by a wider temperature range within the processing window in which sealing is possible. This is particularly surprising because this effect is not attributable to the composition of the two outer sealing layers, but rather to the composition of the middle layer, which as such does not even form an outer surface of the polyolefin film.

[0018] Furthermore, it was surprisingly found that the polyolefin films according to the invention exhibit improved cutting and punching behavior. The cut and punched edges resulting from cutting and punching are significantly improved.

[0019] A first aspect of the invention relates to a multilayer polyethylene film which - an outer sealing layer (A) comprising an ethylene homo or copolymer (ai) and optionally an ethylene homo or copolymer (a2); - a middle layer (B) comprising an ethylene homo or copolymer (bi), an ethylene homo or copolymer (b2) and optionally an ethylene homo or copolymer (b3); and - an outer sealing layer (C) comprising an ethylene homo- or copolymer (c t ) and optionally an ethylene homo- or copolymer (c2); comprises or consists substantially of; wherein - the polyethylene film has a total layer thickness of at most 50 pm, preferably less than 50 pm; - the middle layer (B), if any, contains less than 15 wt% propylene homo- or copolymers in relation to the total weight of the middle layer (B); and - optionally, the sealing layer (A) is at least partially coated with a release coating.

[0020] The polyolefin film according to the invention necessarily comprises an ethylene homopolymer or copolymer (ai) in the sealing layer (A), an ethylene homopolymer or copolymer (bi) and an ethylene homopolymer or copolymer (b2) in the middle layer (B), and an ethylene homopolymer or copolymer (ci) in the sealing layer (C). Additionally, the polyolefin film according to the invention may contain an ethylene homopolymer or copolymer (a2) in the sealing layer (A). Additionally, the polyolefin film according to the invention may contain an ethylene homopolymer or copolymer (b3) in the middle layer (B). Additionally, the polyolefin film according to the invention may contain an ethylene homopolymer or copolymer (c2) in the sealing layer (C).

[0021] The ethylene homo or copolymer (ai) and the ethylene homo or copolymer (a2) that may be present in the sealing layer (A) differ from each other, but may be identical to ethylene homo or copolymers contained in the middle layer (B) and / or the sealing layer (C) independently of each other.

[0022] The ethylene homo or copolymer (bi), the ethylene homo or copolymer (b2) and the ethylene homo or copolymer (b3) that may be present in the middle layer (B) differ from each other, but may be identical to ethylene homo or copolymers contained in the sealing layer (A) and / or the sealing layer (C) independently of each other.

[0023] The ethylene homo or copolymer (c) and the ethylene homo or copolymer (c2) that may be present in the sealing layer (C) differ from each other, but may be identical to ethylene homo or copolymers contained in the sealing layer (A) and / or the middle layer (B) independently of each other.

[0024] In the context of the description, "based on" means that it is the main component, i.e., in a layer based on polyolefin, polyolefin is the main component.

[0025] For the purposes of this description, ethylene homopolymers or copolymers are understood to be ethylene homopolymers which are based exclusively on ethylene, and ethylene copolymers which, in addition to ethylene, are based on at least one further α,β-unsaturated olefin with 3 to 10 carbon atoms, preferably with 4 to 10 carbon atoms.

[0026] Preferred ethylene homo- or copolymers are - Low-density polyethylene (LDPE), preferably with a density of no more than 0.945 g / cm³ 3 , preferably in the range of 0.915 to 0.945 g / cm³ 3 , preferably with highly branched polymer chains; - linear low-density polyethylene (LLDPE), preferably with a density of no more than 0.945 g / cm³ 3 preferably in the range of 0.915 to 0.945 g / cm³ 3 , preferably with short-branched polymer chains, which, in addition to ethylene as a comonomer, may contain one or more higher α,β-saturated olefins such as butene, hexene, or octene. - High-density polyethylene (HDPE), preferably with a density of more than 0.945 g / cm³ 3 , preferably in the range of more than 0.945 to 0.970 g / cm³ 3 , preferably with weakly branched polymer chains which, in addition to ethylene as a comonomer, may contain one or more higher α,β-saturated olefins such as hexene or octene.

[0027] For the purposes of this description, propylene homopolymers or copolymers are understood to be propylene homopolymers based exclusively on propylene, and propylene copolymers based on at least one other α,β-unsaturated olefin with 2 to 10 carbon atoms in addition to propylene. Preferred propylene copolymers are copolymers of propylene and ethylene, wherein the proportion of ethylene is preferably at most 40 wt.%, more preferably at most 20 wt.%, based on the total weight of the propylene copolymer.

[0028] The ethylene homo- or copolymers (ai), (a2), (bi), (b2), (b3), (c) are preferred. t ) and (c2) each independently selected from the group consisting of - Low-density polyethylene (LDPE, p < 0.945 g / cm³) 3 ), - linear low-density polyethylene (LLDPE, p < 0.945 g / cm³) 3 ), and - High-density polyethylene (HDPE p > 0.945 g / cm³) 3 ).

[0029] Preferably, the middle layer (B) contains, if any, at most 12.5 wt.% propylene homo- or copolymers based on the total weight of the middle layer (B); preferably at most 10 wt.%, more preferably at most 7.5 wt.%, even more preferably at most 5 wt.%, most preferably at most 2.5 wt.%, and in particular no propylene homo- or copolymers at all.

[0030] Preferably, the polyethylene film contains, if any, at most 12.5 wt.% propylene homo- or copolymers based on the total weight of the polyethylene film; preferably at most 10 wt.%, more preferably at most 7.5 wt.%, even more preferably at most 5 wt.%, most preferably at most 2.5 wt.%, and in particular no propylene homo- or copolymers at all.

[0031] The ethylene homo- or copolymer (a selected from LDPE and LLDPE; preferably with a density in the range of 0.920 to 0.945 g / cm³) is preferred. 3; preferred LDPE; even more preferred LDPE with a melt flow index (190°C, 2.16 kg, ASTM D1238) of not more than 5.0 g / 10 min, more preferred not more than 4.0 g / 10 min, more preferred not more than 3.0 g / 10 min, most preferred not more than 2.0 g / 10 min, and particularly not more than 1.0 g / 10 min.

[0032] The ethylene homo- or copolymer (ai) LDPE with a density (ASTM D792) in the range of 0.923±0.006 g / cm³ is preferred. 3 ; preferably 0.923 ± 0.005 g / cm³ 3 , preferred 0.923±0.004 g / cm³ 3 , even more preferred 0.923±0.003 g / cm³ 3 , preferably 0.923±0.002 g / cm³ 3 , and in particular 0.923±0.001 g / cm³ 3 .

[0033] Preferably, the weight fraction of the ethylene homo- or copolymer (a based on the total weight of the sealing layer (A)) is at least 20 wt.%; preferably at least 25 wt.%, more preferably at least 30 wt.%, even more preferably at least 35 wt.%, most preferably at least 40 wt.%, and in particular at least 45 wt.%.

[0034] Preferably, the weight fraction of the ethylene homo- or copolymer (a based on the total weight of the sealing layer (A)) is at most 80 wt.%; preferably at most 75 wt.%, more preferably at most 70 wt.%, even more preferably at least 65 wt.%, most preferably at most 60 wt.%, and in particular at most 55 wt.%.

[0035] Preferably the ethylene homo- or copolymer (a2) is selected from LDPE and LLDPE; preferably with a density in the range of 0.920 to 0.945 g / cm³. 3; preferred LLDPE; even more preferred LLDPE with a melt flow index (190°C, 2.16 kg, ASTM Dl 238) of at most 5.0 g / 10 min, more preferred at most 4.0 g / 10 min, more preferred at most 3.0 g / 10 min, most preferred at most 2.0 g / 10 min, and particularly at most 1.0 g / 10 min.

[0036] The ethylene homo- or copolymer (a2) LLDPE with a density (ASTM D792) in the range of 0.940±0.006 g / cm³ is preferred. 3 ; preferably 0.940±0.005 g / cm³ 3 , preferred 0.940±0.004 g / cm³ 3 , even more preferred 0.940±0.003 g / cm³ 3 , preferably 0.940±0.002 g / cm³ 3 , and in particular 0.940±0.001 g / cm³ 3 .

[0037] Preferably the ethylene homo- or copolymer (a2) LLDPE has a VICAT softening temperature (ASTM D1525) in the range of 125±6°C; preferably 125±5°C, more preferably 125±4°C, even more preferably 125±3°C, most preferably 125±2°C, and particularly 125±1°C.

[0038] Preferably, the weight fraction of the ethylene homo- or copolymer (a2) based on the total weight of the sealing layer (A) is at least 10 wt.%; preferably at least 15 wt.%, more preferably at least 20 wt.%, even more preferably at least 25 wt.%, most preferably at least 30 wt.%, and in particular at least 35 wt.%.

[0039] Preferably, the weight fraction of the ethylene homo- or copolymer (a2) based on the total weight of the sealing layer (A) is at most 70 wt.%; preferably at most 65 wt.%, more preferably at most 60 wt.%, even more preferably at least 55 wt.%, most preferably at most 50 wt.%, and in particular at most 45 wt.%.

[0040] Preferably the ethylene homo- or copolymer (bi) is selected from LDPE and LLDPE; preferably with a density in the range of 0.920 to 0.945 g / cm³. 3; preferred LDPE; even more preferred LDPE with a melt flow index (190°C, 2.16 kg, ASTM D1238) of not more than 5.0 g / 10 min, more preferred not more than 4.0 g / 10 min, more preferred not more than 3.0 g / 10 min, most preferred not more than 2.0 g / 10 min, and particularly not more than 1.0 g / 10 min.

[0041] The ethylene homo- or copolymer (bi) LDPE with a density (ASTM D792) in the range of 0.923±0.006 g / cm³ is preferred. 3 ; preferably 0.923 ± 0.005 g / cm³ 3 , preferred 0.923±0.004 g / cm³ 3 , even more preferred 0.923±0.003 g / cm³ 3 , preferably 0.923±0.002 g / cm³ 3 , and in particular 0.923±0.001 g / cm³ 3 .

[0042] Preferably, the weight fraction of the ethylene homo- or copolymer (bi) based on the total weight of the middle layer (B) is at least 15 wt.%; preferably at least 20 wt.%, more preferably at least 25 wt.%, even more preferably at least 30 wt.%, most preferably at least 35 wt.%, and in particular at least 40 wt.%.

[0043] Preferably, the weight fraction of the ethylene homo- or copolymer (bi) based on the total weight of the middle layer (B) is at most 70 wt.%; preferably at most 65 wt.%, more preferably at most 60 wt.%, even more preferably at least 55 wt.%, most preferably at most 50 wt.%, and in particular at most 45 wt.%.

[0044] Preferably the ethylene homo- or copolymer (b2) is selected from LDPE and LLDPE; preferably with a density in the range of 0.920 to 0.945 g / cm³. 3; preferred LLDPE; even more preferred LLDPE with a melt flow index (190°C, 2.16 kg, ASTM Dl 238) of at most 5.0 g / 10 min, more preferred at most 4.0 g / 10 min, more preferred at most 3.0 g / 10 min, most preferred at most 2.0 g / 10 min, and particularly at most 1.0 g / 10 min.

[0045] Preferably the ethylene homo- or copolymer (b2) LLDPE has a density (ASTM D792) in the range of 0.940±0.006 g / cm³. 3 ; preferably 0.940±0.005 g / cm³ 3 , preferred 0.940±0.004 g / cm³ 3 , even more preferred 0.940±0.003 g / cm³ 3 , preferably 0.940±0.002 g / cm³ 3 , and in particular 0.940±0.001 g / cm³ 3 .

[0046] Preferably the ethylene homo- or copolymer (b2) LLDPE has a VICAT softening temperature (ASTM D1525) in the range of 125±6°C; preferably 125±5°C, more preferably 125±4°C, even more preferably 125±3°C, most preferably 125±2°C, and particularly 125±1°C.

[0047] Preferably, the weight fraction of the ethylene homo- or copolymer (b2) based on the total weight of the middle layer (B) is at least 5 wt.%; preferably at least 7.5 wt.%, more preferably at least 10 wt.%, even more preferably at least 12.5 wt.%, most preferably at least 15 wt.%, and in particular at least 17.5 wt.%.

[0048] Preferably, the weight fraction of the ethylene homo- or copolymer (b2) based on the total weight of the middle layer (B) is at most 35 wt.%; preferably at most 32.5 wt.%, more preferably at most 30 wt.%, even more preferably at least 27.5 wt.%, most preferably at most 25 wt.%, and in particular at most 22.5 wt.%.

[0049] In preferred embodiments, the ethylene homo- or copolymer (b3) is selected from HDPE; preferably with a density in the range of 0.950 to 0.965 g / cm³ 3; preferred HDPE with a melt flow index (190°C, 2.16 kg, ASTM Dl 238) of at most 5.0 g / 10 min, more preferred at most 4.0 g / 10 min, still more preferred at most 3.0 g / 10 min, most preferred at most 2.0 g / 10 min, and particularly at most 1.0 g / 10 min.

[0050] Preferably the ethylene homo- or copolymer (b3) HDPE has a density (ASTM D792) in the range of 0.955±0.006 g / cm³. 3 ; preferably 0.955±0.005 g / cm³ 3 , preferred 0.955±0.004 g / cm³ 3 , even more preferred 0.955±0.003 g / cm³ 3 , preferably 0.955±0.002 g / cm³ 3 , and in particular 0.955±0.001 g / cm³ 3 .

[0051] Preferably the ethylene homo- or copolymer (b3) HDPE has a VICAT softening temperature (ASTM D1525) in the range of 129±6°C; preferably 129±5°C, more preferably 129±4°C, even more preferably 129±3°C, most preferably 129±2°C, and particularly 129±1°C.

[0052] In other preferred embodiments, the ethylene homo- or copolymer (b3) is selected from LDPE and LLDPE; preferably having a density in the range of 0.920 to 0.945 g / cm³ 3 ; preferred LLDPE; even more preferred LLDPE with a melt flow index (190°C, 2.16 kg, ASTM D1238) of not more than 5.0 g / 10 min, more preferred not more than 4.0 g / 10 min, more preferred not more than 3.0 g / 10 min, most preferred not more than 2.0 g / 10 min, and particularly not more than 1.0 g / 10 min.

[0053] Preferably the ethylene homo- or copolymer (b3) LLDPE has a density (ASTM D792) in the range of 0.936±0.006 g / cm³. 3 ; preferably 0.936 ± 0.005 g / cm³ 3 , preferred 0.936±0.004 g / cm³ 3 , even more preferred 0.936±0.003 g / cm³ 3 , preferably 0.936±0.002 g / cm³ 3 , and in particular 0.936±0.001 g / cm³ 3 .

[0054] Preferably the ethylene homo- or copolymer (b3) LLDPE has a VICAT softening temperature (ASTM D1525) in the range of 119±6°C; preferably 119±5°C, more preferably 119±4°C, even more preferably 119±3°C, most preferably 119±2°C, and particularly 119±1°C.

[0055] Preferably, the weight fraction of the ethylene homo- or copolymer (b3) based on the total weight of the middle layer (B) is at least 5 wt.%; preferably at least 10 wt.%, more preferably at least 15 wt.%, even more preferably at least 20 wt.%, most preferably at least 25 wt.%, and particularly at least 30 wt.%. Preferably, the weight fraction of the ethylene homo- or copolymer (b3) based on the total weight of the middle layer (B) is at least 35 wt.%; more preferably at least 40 wt.%.

[0056] Preferably, the weight fraction of the ethylene homo- or copolymer (b3) based on the total weight of the middle layer (B) is at most 60 wt.%; preferably at most 55 wt.%, more preferably at most 50 wt.%, even more preferably at least 45 wt.%, most preferably at most 40 wt.%, and in particular at most 35 wt.%.

[0057] The ethylene homo- or copolymer (c) is preferred. t ) selected from LDPE and LLDPE; preferably with a density in the range of 0.920 to 0.945 g / cm³ 3 ; preferred LDPE; even more preferred LDPE with a melt flow index (190°C, 2.16 kg, ASTM D1238) of not more than 5.0 g / 10 min, more preferred not more than 4.0 g / 10 min, more preferred not more than 3.0 g / 10 min, most preferred not more than 2.0 g / 10 min, and particularly not more than 1.0 g / 10 min.

[0058] The ethylene homo- or copolymer (c LDPE) with a density (ASTM D792) in the range of 0.923±0.006 g / cm³ is preferred. 3 ; preferably 0.923 ± 0.005 g / cm³3 , preferred 0.923±0.004 g / cm³ 3 , even more preferred 0.923±0.003 g / cm³ 3 , preferably 0.923±0.002 g / cm³ 3 , and in particular 0.923±0.001 g / cm³ 3 .

[0059] Preferably, the weight fraction of the ethylene homo- or copolymer (ci) based on the total weight of the sealing layer (C) is at least 20 wt.%; preferably at least 25 wt.%, more preferably at least 30 wt.%, even more preferably at least 35 wt.%, most preferably at least 40 wt.%, and in particular at least 45 wt.%.

[0060] Preferably, the weight fraction of the ethylene homo- or copolymer (ci) based on the total weight of the sealing layer (C) is at most 80 wt.%; preferably at most 75 wt.%, more preferably at most 70 wt.%, even more preferably at least 65 wt.%, most preferably at most 60 wt.%, and in particular at most 55 wt.%.

[0061] Preferably the ethylene homo- or copolymer (c2) is selected from LDPE and LLDPE; preferably with a density in the range of 0.920 to 0.945 g / cm³. 3 ; preferred LLDPE; even more preferred LLDPE with a melt flow index (190°C, 2.16 kg, ASTM Dl 238) of at most 5.0 g / 10 min, more preferred at most 4.0 g / 10 min, more preferred at most 3.0 g / 10 min, most preferred at most 2.0 g / 10 min, and particularly at most 1.0 g / 10 min.

[0062] The ethylene homo- or copolymer (c2) LLDPE with a density (ASTM D792) in the range of 0.940±0.006 g / cm³ is preferred. 3 ; preferably 0.940±0.005 g / cm³ 3 , preferred 0.940±0.004 g / cm³ 3 , even more preferred 0.940±0.003 g / cm³ 3 , preferably 0.940±0.002 g / cm³ 3 , and in particular 0.940±0.001 g / cm³ 3 .

[0063] Preferably the ethylene homo- or copolymer (c2) LLDPE has a VICAT softening temperature (ASTM D1525) in the range of 125±6°C; preferably 125±5°C, more preferably 125±4°C, even more preferably 125±3°C, most preferably 125±2°C, and particularly 125±1°C.

[0064] Preferably, the weight fraction of the ethylene homo- or copolymer (c2) based on the total weight of the sealing layer (C) is at least 10 wt.%; preferably at least 15 wt.%, more preferably at least 20 wt.%, even more preferably at least 25 wt.%, most preferably at least 30 wt.%, and in particular at least 35 wt.%.

[0065] Preferably, the weight fraction of the ethylene homo- or copolymer (c2) based on the total weight of the sealing layer (C) is at most 70 wt.%; preferably at most 65 wt.%, more preferably at most 60 wt.%, even more preferably at least 55 wt.%, most preferably at most 50 wt.%, and in particular at most 45 wt.%.

[0066] The ethylene homo- or copolymers (a , (bi) and (c) are preferably selected independently of each other from LDPE and LLDPE; preferably with a density in the range of 0.920 to 0.945 g / cm³ 3 ; preferred LDPE; even preferred LDPE with a melt flow index (190°C, 2.16 kg, ASTM D1238) of at most 5.0 g / 10 min, preferably at most 4.0 g / 10 min, even more preferably at most 3.0 g / 10 min, most preferably at most 2.0 g / 10 min, and in particular at most 1.0 g / 10 min.

[0067] The ethylene homo- or copolymers (ai), (bi) and (c) are preferred, each independently of one another, LDPE with a density (ASTM D792) in the range of 0.923±0.006 g / cm³. 3 ; preferably 0.923 ± 0.005 g / cm³ 3 , preferred 0.923±0.004 g / cm³ 3 , even more preferred 0.923±0.003 g / cm³ 3 , preferably 0.923±0.002 g / cm³ 3 , and in particular 0.923±0.001 g / cm³ 3 .

[0068] Preferably, the ethylene homo- or copolymers (a2), (b2) and (c2) are each independently selected from LDPE and LLDPE; preferably with a density in the range of 0.920 to 0.945 g / cm³ 3 ; preferred LLDPE; even more preferred LLDPE with a melt flow index (190°C, 2.16 kg, ASTM D1238) of not more than 5.0 g / 10 min, more preferred not more than 4.0 g / 10 min, more preferred not more than 3.0 g / 10 min, most preferred not more than 2.0 g / 10 min, and particularly not more than 1.0 g / 10 min.

[0069] Preferably, the ethylene homo- or copolymers (a2), (b2) and (c2) are each independently LLDPE with a density (ASTM D792) in the range of 0.940±0.006 g / cm³. 3 ; preferably 0.940±0.005 g / cm³ 3 , preferred 0.940±0.004 g / cm³ 3 , even more preferred 0.940±0.003 g / cm³ 3 , preferably 0.940±0.002 g / cm³ 3 , and in particular 0.940±0.001 g / cm³ 3 .

[0070] Preferably, the ethylene homo- or copolymers (a2), (b2) and (c2) are each independently LLDPE with a VICAT softening temperature (ASTM D1525) in the range of 125±6°C; preferably 125±5°C, more preferably 125±4°C, even more preferably 125±3°C, most preferably 125±2°C, and in particular 125±1°C.

[0071] Preferably the sealing layer (A) contains - as an ethylene homo- or copolymer (a an LDPE with a weight fraction based on the total weight of the sealing layer (A) in the range of 50±17.5 wt.%; preferably 50±15 wt.%, more preferably 50±12.5 wt.%, even more preferably 50±10 wt.%, most preferably 50±7.5 wt.% and in particular 50±5 wt.%; and - as an ethylene homo- or copolymer (a2) an LLDPE with a weight fraction based on the total weight of the sealing layer (A) in the range of 40±17.5 wt.%; preferably 40±15 wt.%, more preferably 40±12.5 wt.%, even more preferably 40±10 wt.%, most preferably 40±7.5 wt.% and in particular 40±5 wt.%.

[0072] Preferably, the sealing layer (A) contains, if any, a maximum of 12.5 wt.% of polymers that are neither LDPE nor LLDPE, based on the total weight of the sealing layer (A); preferably a maximum of 10 wt.%, more preferably a maximum of 7.5 wt.%, even more preferably a maximum of 5 wt.%, most preferably a maximum of 2.5 wt.%, and in particular no polymers that are neither LDPE nor LLDPE. Preferably, the sealing layer (A) contains, if any, a maximum of 12.5 wt.% of polymers that are neither LDPE nor LLDPE, based on the total weight of the sealing layer (A). The total weight of the sealing layer (A) contains at most 1.5 wt.% polymers which are neither LDPE nor LLDPE; preferably at most 1.0 wt.%, more preferably at most 0.75 wt.%, even more preferably at most 0.5 wt.%, most preferably at most 0.25 wt.%, and in particular no polymers which are neither LDPE nor LLDPE.

[0073] Preferably, the sealing layer (A) contains, if any, at most 14 wt.% inorganic components based on the total weight of the sealing layer (A); preferably at most 13 wt.%, more preferably at most 12 wt.%, even more preferably at most 11 wt.%, most preferably 10 wt.% and in particular at most 9 wt.%.

[0074] In preferred embodiments, the sealing layer (A) contains at most 2.5 wt.% inorganic components based on the total weight of the sealing layer (A); preferably at most 2.0 wt.%, more preferably at most 1.5 wt.%, even more preferably at most 1.0 wt.%, most preferably 0.5 wt.% and in particular at most 0.1 wt.%.

[0075] Preferably, the sealing layer (A) has a thickness in the range of 1.5 to 12.5 pm.

[0076] In preferred forms, the middle layer (B) contains - as an ethylene homo- or copolymer (bi) an LDPE with a weight fraction based on the total weight of the middle layer (B) in the range of 45±17.5 wt.%; preferably 45±15 wt.%, more preferably 45±12.5 wt.%, even more preferably 45±10 wt.%, most preferably 45±7.5 wt.% and in particular 45±5 wt.%; - as an ethylene homo- or copolymer (b2) an LLDPE with a weight fraction based on the total weight of the middle layer (B) in the range of 20±17.5 wt.%; preferably 20±15 wt.%, more preferably 20±12.5 wt.%, even more preferably 20±10 wt.%, most preferably 20±7.5 wt.% and in particular 20±5 wt.%; and - as an ethylene homo or copolymer (b3) an HDPE with a weight fraction based on the total weight of the middle layer (B) in the range of 30±17.5 wt.%; preferably 30±15 wt.%, more preferably 30±12.5 wt.%, even more preferably 30±10 wt.%, most preferably 30±7.5 wt.% and in particular 30±5 wt.%.

[0077] In other preferred forms, the middle layer (B) contains - as an ethylene homo- or copolymer (bi) an LDPE with a weight fraction based on the total weight of the middle layer (B) in the range of 15±12.5 wt.%; preferably 15±10 wt.%, more preferably 15±7.5 wt.%, even more preferably 15±5.0 wt.%, most preferably 15±2.5 wt.% and in particular 15±1.0 wt.%; and - as ethylene homo- or copolymer (b2) an LLDPE or several different LLDPEs with a weight fraction based on the total weight of the middle layer (B) in the range of 75±17.5 wt.%; preferably 75±15 wt.%, more preferably 75±12.5 wt.%, even more preferably 75±10 wt.%, most preferably 75±7.5 wt.% and in particular 75±5 wt.%.

[0078] In further preferred embodiments, the middle layer (B) contains - as an ethylene homo- or copolymer (bi) an LDPE with a weight fraction based on the total weight of the middle layer (B) in the range of 15±12.5 wt.%; preferably 15±10 wt.%, more preferably 15±7.5 wt.%, even more preferably 15±5.0 wt.%, most preferably 15±2.5 wt.% and in particular 15±1.0 wt.%; - as an ethylene homo- or copolymer (b2) a first LLDPE having a weight fraction based on the total weight of the middle layer (B) in the range of 20±17.5 wt.%; preferably 20±15 wt.%, more preferably 20±12.5 wt.%, even more preferably 20±10 wt.%, most preferably 20±7.5 wt.% and in particular 20±5 wt.%; and - as an ethylene homo- or copolymer (b3) a second LLDPE which differs from the first LLDPE, having a weight fraction based on the total weight of the middle layer (B) in the range of 55±17.5 wt.%; preferably 55±15 wt.%, more preferably 55±12.5 wt.%, even more preferably 55±10 wt.%, most preferably 55±7.5 wt.% and in particular 55±5 wt.%.

[0079] The first LLDPE (b2) and the second LLDPE (b3) differ from each other preferably in at least one property selected from comonomer besides ethylene, density, melt flow index (MFI, 190°C, 2.16 kg) and VICAT softening temperature.

[0080] In preferred embodiments, the first LLDPE (b2) comprises octene as a comonomer in addition to ethylene, and the second LLDPE (b3) comprises hexene as a comonomer in addition to ethylene.

[0081] In preferred embodiments, the density of the first LLDPE (b2) is greater than the density of the second LLDPE (b3).

[0082] In preferred embodiments, the melt flow index of the first LLDPE (b2) is greater than the melt flow index of the second LLDPE (b3).

[0083] In preferred embodiments, the VICAT softening temperature of the first LLDPE (b2) is higher than the VICAT softening temperature of the second LLDPE (b3).

[0084] Preferably, the middle layer (B) contains, if any, a maximum of 12.5 wt.% of polymers that are neither LDPE, LLDPE, nor HDPE, based on the total weight of the middle layer (B); preferably a maximum of 10 wt.%, more preferably a maximum of 7.5 wt.%, even more preferably a maximum of 5 wt.%, most preferably a maximum of 2.5 wt.%, and in particular no polymers that are neither LDPE, LLDPE, nor HDPE. Preferably, the middle layer (B) contains, if any, a maximum of 1.5 wt.% of polymers that are neither LDPE, LLDPE, nor HDPE, based on the total weight of the middle layer (B); preferably a maximum of 1.0 wt.%, more preferably a maximum of 0.75 wt.%, even more preferably a maximum of 0.5 wt.%, most preferably a maximum of 0.25 wt.%, and in particular no polymers that are neither LDPE, LLDPE, nor HDPE.

[0085] Preferably, the middle layer (B) contains, if any, at most 19 wt.% inorganic components based on the total weight of the middle layer (B); preferably at most 18 wt.%, more preferably at most 17 wt.%, even more preferably at most 16 wt.%, most preferably 15 wt.% and in particular at most 14 wt.%.

[0086] Preferably the middle layer (B) has a layer thickness in the range of 3 to 25 pm, preferably 5 to 20 pm.

[0087] Preferably the sealing layer contains (C) - as an ethylene homo- or copolymer (ci) an LDPE with a weight fraction based on the total weight of the sealing layer (C) in the range of 50±17.5 wt.%; preferably 50±15 wt.%, more preferably 50±12.5 wt.%, even more preferably 50±10 wt.%, most preferably 50±7.5 wt.% and in particular 50±5 wt.%; and - as an ethylene homo- or copolymer (c2) an LLDPE with a weight fraction based on the total weight of the sealing layer (C) in the range of 40±17.5 wt.%; preferably 40±15 wt.%, more preferably 40±12.5 wt.%, even more preferably 40±10 wt.%, most preferably 40±7.5 wt.% and in particular 40±5 wt.%.

[0088] Preferably, the sealing layer (C) contains, if any, a maximum of 12.5 wt.% of polymers that are neither LDPE nor LLDPE, based on the total weight of the sealing layer (C); preferably a maximum of 10 wt.%, more preferably a maximum of 7.5 wt.%, even more preferably a maximum of 5 wt.%, most preferably a maximum of 2.5 wt.%, and in particular no polymers that are neither LDPE nor LLDPE. Preferably, the sealing layer (C) contains, if any, a maximum of 1.5 wt.% of polymers that are neither LDPE nor LLDPE, based on the total weight of the sealing layer (C); preferably a maximum of 1.0 wt.%, more preferably a maximum of 0.75 wt.%, even more preferably a maximum of 0.5 wt.%, most preferably a maximum of 0.25 wt.%, and in particular no polymers that are neither LDPE nor LLDPE.

[0089] Preferably, the sealing layer (C) contains, if any, at most 14 wt.% inorganic components based on the total weight of the sealing layer (C); preferably at most 13 wt.%, more preferably at most 12 wt.%, even more preferably at most 11 wt.%, most preferably 10 wt.% and in particular at most 9 wt.%.

[0090] In preferred embodiments, the sealing layer (C) contains at most 2.5 wt.% inorganic components based on the total weight of the sealing layer (C); preferably at most 2.0 wt.%, more preferably at most 1.5 wt.%, even more preferably at most 1.0 wt.%, most preferably 0.5 wt.% and in particular at most 0.1 wt.%.

[0091] Preferably, the sealing layer (C) has a thickness in the range of 1.5 to 12.5 pm.

[0092] Preferably, the polyethylene film contains, if any, at most a total of 12.5 wt.% polymers based on the total weight of the polyethylene film, which are neither LDPE nor LLDPE nor The polyethylene film contains, preferably, at most 10 wt.%, more preferably at most 7.5 wt.%, even more preferably at most 5 wt.%, most preferably at most 2.5 wt.%, and in particular no polymers other than LDPE, LLDPE, or HDPE. Preferably, the polyethylene film contains, if any, at most a total of 1.5 wt.% of polymers other than LDPE, LLDPE, or HDPE, based on the total weight of the polyethylene film; preferably at most 1.0 wt.%, more preferably at most 0.75 wt.%, even more preferably at most 0.5 wt.%, most preferably at most 0.25 wt.%, and in particular no polymers other than LDPE, LLDPE, or HDPE.

[0093] Preferably, the polyethylene film contains, if any, a maximum of 12.5 wt.% of polymers that are neither LDPE nor LLDPE, based on the total weight of the polyethylene film; preferably a maximum of 10 wt.%, more preferably a maximum of 7.5 wt.%, even more preferably a maximum of 5 wt.%, most preferably a maximum of 2.5 wt.%, and in particular no polymers that are neither LDPE nor LLDPE. Preferably, the polyethylene film contains, if any, a maximum of 1.5 wt.% of polymers that are neither LDPE nor LLDPE, based on the total weight of the polyethylene film; preferably a maximum of 1.0 wt.%, more preferably a maximum of 0.75 wt.%, even more preferably a maximum of 0.5 wt.%, most preferably a maximum of 0.25 wt.%, and in particular no polymers that are neither LDPE nor LLDPE.

[0094] Preferably, the polyethylene film according to the invention has a symmetrical layer structure with regard to the sealing layer (A), the middle layer (B) and the sealing layer (C).

[0095] Preferably, the polyethylene film according to the invention comprises no further layers besides the sealing layer (A) which may be coated with the release coating, the middle layer (B) and the sealing layer (C).

[0096] Preferably, the polyethylene film according to the invention has a total layer thickness of at least 10 pm.

[0097] Preferably, the polyethylene film according to the invention has a total layer thickness of at most 45 pm, more preferably at most 40 pm, even more preferably at most 35 pm, most preferably at most 30 pm and in particular at most 25 pm.

[0098] In preferred embodiments, the polyethylene film according to the invention has a total layer thickness in the range of 10 to 25 pm, preferably 10 to 20 pm. Particularly for use in packaging sanitary napkins, the polyethylene film according to the invention has a total layer thickness of at most 24 pm, more preferably at most 23 pm, even more preferably at most 22 pm, most preferably at most 21 pm, and particularly at most 20 pm. In these preferred embodiments, the sealing layer (A) is preferably at least partially coated with a release coating.

[0099] In other preferred embodiments, the polyethylene film according to the invention has a total layer thickness in the range of 25 to 40 pm, preferably 20 to 40 pm. In particular for For use in packaging tampon applicators, the polyethylene film according to the invention has a total layer thickness in the range of 35 to 50 µm. In these preferred embodiments, the polyethylene film according to the invention preferably does not have a release coating.

[0100] Preferably, the ratio of the layer thicknesses of the sealing layer (A), the middle layer (B) and the sealing layer (C) is in the range of 1:1, 5:1 to 1:3, 5:1, preferably about 1:2:1.

[0101] Preferably, the sealing layer (A), the middle layer (B) and / or the sealing layer (C) independently contain at least one additive; preferably selected from the group consisting of dyes, fillers such as CaCO3; plasticizers; lubricants; emulsifiers; pigments; rheology additives; catalysts; flow control agents; optical brighteners; light stabilizers; antioxidants; clarifying agents such as substituted or unsubstituted bisbenzylidene sorbites; flame retardants; antistatic agents; UV absorbers such as benzoxazinones; blowing agents; and thiosynergists such as thiodipropionic acid dilauryl ester or thiodipropionic acid distearyryl ester.

[0102] Preferably, the polyethylene film contains, if any, at most 5.0 wt.% inorganic components based on the total weight of the polyethylene film; preferably at most 4.5 wt.%, more preferably at most 4.0 wt.%, even more preferably at most 3.5 wt.%, most preferably 3.0 wt.% and in particular at most 2.5 wt.%.

[0103] In preferred embodiments, the sealing layer (A) and the sealing layer (C) each have a substantially smooth surface.

[0104] In other preferred embodiments, the polyethylene film according to the invention is structured, preferably embossed.

[0105] Preferably, the polyethylene film according to the invention has a tear strength in the machine direction (MD) of at least 2.0 N according to DIN 53356; preferably at least 3.0 N, more preferably at least 4.0 N, even more preferably at least 5.0 N, most preferably at least 6.0 N, and particularly at least 7.0 N. This tear strength is preferably achieved with a total layer thickness of the polyethylene film of 20 µm. If the polyethylene film has a different total layer thickness, the numerical minimum tear strengths must be adjusted accordingly.

[0106] Preferably, the polyethylene film according to the invention has a tear strength of at least 2.0 N in the machine direction (MD) according to DIN 53363; preferably at least 3.0 N, more preferably at least 4.0 N, even more preferably at least 5.0 N, most preferably at least 6.0 N, and particularly at least 6.5 N. This tear strength is preferably achieved with a total layer thickness of the polyethylene film of 20 µm. If the polyethylene film has a different total layer thickness, the numerical minimum tear strengths must be adjusted accordingly.

[0107] Optionally, the sealing layer (A) is at least partially coated on its outer surface with a release coating. In preferred embodiments, the coating with the release coating- The coating covers the entire surface. In preferred embodiments, the coating with the release coating is applied only partially.

[0108] Preferably, the release coating has a basis weight of no more than 0.65 g / m². 2 on; preferably not more than 0.60 g / m² 2 , preferably not more than 0.55 g / m³ 2 , preferably no more than 0.50 g / m² 2 , preferably no more than 0.45 g / m² 2 , and in particular a maximum of 0.40 g / m² 2 ; preferably not more than 0.35 g / m³ 2 , preferably not more than 0.30 g / m² 2 , preferably no more than 0.25 g / m² 2 , preferably no more than 0.20 g / m² 2 .

[0109] Preferably, the release coating is based on at least one cured polysiloxane selected from the group consisting of - addition-crosslinked, preferably metal-catalyzed addition-crosslinked, condensation-crosslinked, radically crosslinked, and / or cationically crosslinked polysiloxanes; preferably radically crosslinked polysiloxanes; and / or - Polydialkylsiloxanes, preferably polydimethylsiloxanes; and polyalkylarylsiloxanes, preferably polymethylphenylsiloxanes; preferably chemically cross-linked acrylate-functionalized polysiloxanes; preferably chemically cross-linked acrylate-functionalized polydialkylsiloxanes, preferably chemically cross-linked acrylate-functionalized polydimethylsiloxanes; or chemically cross-linked acrylate-functionalized polyalkylarylsiloxanes, preferably chemically cross-linked acrylate-functionalized polymethylphenylsiloxanes.

[0110] Preferably, the polyethylene film is blown film co-extruded.

[0111] In preferred embodiments, the sealing layer (A) is at least partially printed with an image on its outer surface. The printed image can cover the sealing layer (A) completely or partially.

[0112] If the sealing layer (A) is additionally coated at least partially with a release coating on its outer surface and there are surface sections which are coated with both a printed image and a release coating, the printed image is preferably arranged between the outer surface of the sealing layer (A) and the release coating.

[0113] In preferred embodiments, the sealing layer (C) is at least partially printed with a design on its outer surface. The design can cover the sealing layer (C) completely or partially.

[0114] Another aspect of the invention relates to the use of the polyethylene film described above as packaging material, preferably for packaging hygiene products; more preferably sanitary napkins or tampon applicators.

[0115] Another aspect of the invention relates to packaging comprising the polyethylene film described above according to the invention as packaging material.

[0116] Another aspect of the invention relates to a packaging comprising a hygiene product as the packaging item, preferably a sanitary napkin or a tampon applicator, and the polyethylene film described above according to the invention as the packaging material.

[0117] The following examples serve to illustrate the invention, but are not to be interpreted restrictively:

[0118] One of the following two designs was selected in each case: M5: Low embossing height for matting the surface; Thickness: 17 pm, Embossing height: 20-45 pm; A3: Pyramidal embossing with a greater embossing height than M5. Thickness: 35-40 pm, embossing height: 60-100 pm.

[0119] Example according to the invention:

[0120] A three-layer polyethylene film Bl according to the invention was produced by blown film coextrusion. The polyethylene film according to the invention had a total density of 0.963 g / cm³. 3 , a layer thickness ratio of 1:2:1 and the following layer structure (M5 embossed): 1 LDPE, with 70% chalk (prevents clogging, improves whiteness and opacity) 2 LDPE with <10% PDMS 3 LDPE with 70% TiO2 (improves whiteness and opacity)

[0121] The polyethylene film Bl contained exclusively LDPE, LLDPE, and HDPE as polymers, i.e., entirely ethylene homo- or copolymers. Furthermore, the polyethylene film contained only a small proportion of inorganic components, making it not only homogeneous but also highly recyclable overall.

[0122] Example according to the invention B2a,b:

[0123] A three-layer polyethylene film B2 according to the invention was produced by blown film coextrusion. The polyethylene film according to the invention had a total density of 0.962 g / cm³. 3 , a layer thickness ratio of 1:2:1 and the following layer structure (M5 embossed):

[0124] Polyethylene film B2a,b contained exclusively LDPE and LLDPE polymers, i.e., entirely ethylene homo- or copolymers. Furthermore, the polyethylene film contained only a small proportion of inorganic components, making it not only homogeneous but also highly recyclable overall. The structure and composition of the layers were identical for polyethylene films B2a and B2b; only the total layer thickness differed.

[0125] Example according to the invention B3a,b:

[0126] A three-layer polyethylene film B3a,b, according to the invention, was produced by blown film co-extrusion. The polyethylene film according to the invention had a total density of 0.970 g / cm³. 3 , a layer thickness ratio of 1:2:1 and the following layer structure (A3 embossed):

[0127] Polyethylene film B3a,b contained exclusively LDPE and LLDPE polymers, i.e., entirely ethylene homo- or copolymers. Furthermore, the two outer layers (A) and (C) of the polyethylene film contained no inorganic components whatsoever, making it not only homogeneous but also highly recyclable. The structure and composition of the layers were identical for polyethylene films B3a and B3b; only the overall layer thickness differed.

[0128] Comparative example VI:

[0129] A three-layer reference film VI was produced by blown film coextrusion. The reference film had a total density of 0.964 g / cm³. 3 , a layer thickness ratio of 1:2:1 and the following layer structure: 1 LDPE, with 70% chalk (prevents clogging, improves whiteness and opacity) 2 LDPE with <10% PDMS 3 LDPE with 70% TiO2 (improves whiteness and opacity)

[0130] The polyolefin film VI contained significant amounts of polypropylene copolymer in the middle layer (B), which is why it is neither pure nor easily recyclable.

[0131] Comparison example V2:

[0132] A three-layer reference film V2 was produced by blown film coextrusion. The reference film had a total density of 0.960 g / cm³. 3 , a layer thickness ratio of 1:2:1 and the following layer structure: 1LDPE, with 70% chalk (prevents clogging, improves whiteness and opacity) 3 LDPE with 70% TiO2 (improves whiteness and opacity) 4 LDPE with 5% PFAS (per- and perfluoroalkyl substances).

[0133] The polyolefin film V2 contained significant amounts of polypropylene copolymer in the middle layer (B), which is why it is neither pure nor easily recyclable.

[0134] Characteristics:

[0135] Numerous properties of the polyethylene films Bl, B2a, B2b, B3a and B3b according to the invention, as well as of the two comparison films VI and V2, were determined. The results are summarized in the following table: Punching behavior:

[0136] As the experimental data in the table above demonstrate, the polyethylene films according to the invention exhibit very good tensile strength in the machine direction (MD) at high modulus of elasticity, which is particularly evident from the force values ​​at 1%, 2% and 5%.

[0137] Furthermore, the polyethylene films according to the invention exhibit improved sealing properties, as evidenced by the wider temperature range of the processing window. This is particularly surprising because the composition of the two outer sealing layers (A) and (C) is not the cause, as it has not been changed, but rather the composition of the middle layer (B), which as such does not even form an outer surface of the polyethylene film.

[0138] Furthermore, the polyethylene films according to the invention exhibit improved process capability, the evaluation of which cumulatively considers the extrusion performance in kg / h as well as the quality with regard to specks, holes, or embossing defects. The two comparison films are characterized by average process capability, whereby maximum plant performance is not achieved (<85% of the maximum speed in m / min), because specks, holes, and embossing defects occur repeatedly. In contrast, the polyethylene film according to the invention is characterized by very good process capability, whereby maximum plant performance is achieved (>98% to 100% of the maximum speed in m / min), because specks, holes, or embossing defects occur only very rarely, if at all.

[0139] Furthermore, the experimental data show that the polyolefin films according to the invention exhibit improved cutting and punching behavior. The cut and punched edges produced during cutting and punching are significantly improved.

Claims

Patent claims:

1. A multi-layered polyethylene film, which - an outer sealing layer (A) comprising an ethylene homo- or copolymer (a t ) and optionally an ethylene homo or copolymer (a2); - a middle layer (B) comprising an ethylene homo- or copolymer (bi), an ethylene homo- or copolymer (b2) and optionally an ethylene homo- or copolymer (b3); and - an outer sealing layer (C) comprising an ethylene homo- or copolymer (c) and optionally an ethylene homo- or copolymer (c2); comprising or substantially consisting of; wherein - the polyethylene film has a total layer thickness of no more than 50 pm; - the middle layer (B), if any, contains less than 15 wt% propylene homo- or copolymers in relation to the total weight of the middle layer (B); and - optionally, the sealing layer (A) is at least partially coated with a release coating.

2. The polyethylene film according to claim 1, wherein the ethylene homo- or copolymer (a . (a2), (b . (b2), (b3), (ci) and (c2) are each independently selected from the group consisting of low-density polyethylene (LDPE, p < 0.945 g / cm²). 3 ), linear low-density polyethylene (LLDPE, p < 0.945 g / cm³) 3 ), and high-density polyethylene (HDPE p > 0.945 g / cm³) 3 ).

3. The polyethylene film according to claim 1 or 2, wherein the middle layer (B), if any, contains at most 12.5 wt.% propylene homo- or copolymers based on the total weight of the middle layer (B); preferably at most 10 wt.%, more preferably at most 7.5 wt.%, even more preferably at most 5 wt.%, most preferably at most 2.5 wt.%, and in particular no propylene homo- or copolymers at all.

4. The polyethylene film according to one of the preceding claims, wherein the polyethylene film contains, if any, at most a total of 12.5 wt.% propylene homo- or copolymers based on the total weight of the polyethylene film; preferably at most 10 wt.%, more preferably at most 7.5 wt.%, even more preferably at most 5 wt.%, most preferably at most 2.5 wt.%, and in particular no propylene homo- or copolymers at all.

5. The polyethylene film according to any of the preceding claims, wherein the ethylene homo- or copolymer (a) is selected from LDPE and LLDPE; preferably with a density in the range of 0.920 to 0.945 g / cm³ 3 ; preferred LDPE; even more preferred LDPE with a melt flow index (190°C, 2.16 kg, ASTM D1238) of not more than 5.0 g / 10 min, more preferred not more than 4.0 g / 10 min, more preferred not more than 3.0 g / 10 min, most preferred not more than 2.0 g / 10 min, and particularly not more than 1.0 g / 10 min.

6. The polyethylene film according to one of the preceding claims, wherein the ethylene homo- or copolymer (a t ) LDPE with a density (ASTM D792) in the range of 0.923±0.006 g / cm³ 3 is; preferably 0.923 ± 0.005 g / cm³ 3 , preferred 0.923±0.004 g / cm³ 3 , even more preferred 0.923±0.003 g / cm³ 3 , preferably 0.923±0.002 g / cm³ 3 , and in particular 0.923±0.001 g / cm³ 3 .

7. The polyethylene film according to one of the preceding claims, wherein the weight fraction of the ethylene homo- or copolymer (a t ) based on the total weight of the sealing layer (A) is at least 20 wt.%; preferably at least 25 wt.%, more preferably at least 30 wt.%, more preferably at least 35 wt.%, most preferably at least 40 wt.%, and in particular at least 45 wt.%.

8. The polyethylene film according to one of the preceding claims, wherein the weight fraction of the ethylene homo- or copolymer (ai) based on the total weight of the sealing layer (A) is at most 80 wt.%; preferably at most 75 wt.%, more preferably at most 70 wt.%, more preferably at least 65 wt.%, most preferably at most 60 wt.%, and in particular at most 55 wt.%.

9. The polyethylene film according to any of the preceding claims, wherein the ethylene homo- or copolymer (a2) is selected from LDPE and LLDPE; preferably with a density in the range of 0.920 to 0.945 g / cm³ 3 ; preferred LLDPE; even more preferred LLDPE with a melt flow index (190°C, 2.16 kg, ASTM D1238) of not more than 5.0 g / 10 min, more preferred not more than 4.0 g / 10 min, more preferred not more than 3.0 g / 10 min, most preferred not more than 2.0 g / 10 min, and particularly not more than 1.0 g / 10 min.

10. The polyethylene film according to one of the preceding claims, wherein the ethylene homo- or copolymer (a2) LLDPE has a density (ASTM D792) in the range of 0.940±0.006 g / cm³ 3 is; preferably 0.940 ± 0.005 g / cm³ 3 , preferred 0.940±0.004 g / cm³ 3 , even more preferred 0.940±0.003 g / cm³ 3 , preferably 0.940±0.002 g / cm³ 3 , and in particular 0.940±0.001 g / cm³ 3 .

11. The polyethylene film according to any of the preceding claims, wherein the ethylene homo- or copolymer (a2) is LLDPE having a VICAT softening temperature (ASTM D1 525) in the range of 125±6°C; preferably 125±5°C, more preferably 125±4°C, even more preferably 125±3°C, most preferably 125±2°C, and particularly 125±1°C.

12. The polyethylene film according to one of the preceding claims, wherein the weight fraction of the ethylene homo- or copolymer (a2) based on the total weight of the sealing layer (A) is at least 10 wt.%; preferably at least 15 wt.%, more preferably at least 20 wt.%, more preferably at least 25 wt.%, most preferably at least 30 wt.%, and in particular at least 35 wt.%.

13. The polyethylene film according to one of the preceding claims, wherein the weight fraction of the ethylene homo- or copolymer (a2) is based on the total weight of the sealing layer (A) at most 70 wt.%; preferably at most 65 wt.%, more preferably at most 60 wt.%, more preferably at least 55 wt.%, most preferably at most 50 wt.%, and in particular at most 45 wt.%.

14. The polyethylene film according to any of the preceding claims, wherein the ethylene homo- or copolymer (bi) is selected from LDPE and LLDPE; preferably with a density in the range of 0.920 to 0.945 g / cm³ 3 ; preferred LDPE; even more preferred LDPE with a melt flow index (190°C, 2.16 kg, ASTM D1238) of not more than 5.0 g / 10 min, more preferred not more than 4.0 g / 10 min, more preferred not more than 3.0 g / 10 min, most preferred not more than 2.0 g / 10 min, and particularly not more than 1.0 g / 10 min.

15. The polyethylene film according to any of the preceding claims, wherein the ethylene homo- or copolymer (bi) LDPE has a density (ASTM D792) in the range of 0.923±0.006 g / cm³ 3 is; preferably 0.923 ± 0.005 g / cm³ 3 , preferred 0.923±0.004 g / cm³ 3 , even more preferred 0.923±0.003 g / cm³ 3 , preferably 0.923±0.002 g / cm³ 3 , and in particular 0.923±0.001 g / cm³ 3 .

16. The polyethylene film according to any of the preceding claims, wherein the weight fraction of the ethylene homo- or copolymer (bi) is at least 15 wt.% based on the total weight of the middle layer (B); preferably at least 20 wt.%, more preferably at least 25 wt.%, more preferably at least 30 wt.%, most preferably at least 35 wt.%, and in particular at least 40 wt.%.

17. The polyethylene film according to any of the preceding claims, wherein the weight fraction of the ethylene homo- or copolymer (bi) based on the total weight of the middle layer (B) is at most 70 wt.%; preferably at most 65 wt.%, more preferably at most 60 wt.%, more preferably at least 55 wt.%, most preferably at most 50 wt.%, and in particular at most 45 wt.%.

18. The polyethylene film according to any one of the preceding claims, wherein the ethylene homo- or copolymer (b2) is selected from LDPE and LLDPE; preferably having a density in the range of 0.920 to 0.945 g / cm³ 3 ; preferred LLDPE; even more preferred LLDPE with a melt flow index (190°C, 2.16 kg, ASTM D1238) of not more than 5.0 g / 10 min, more preferred not more than 4.0 g / 10 min, more preferred not more than 3.0 g / 10 min, most preferred not more than 2.0 g / 10 min, and particularly not more than 1.0 g / 10 min.

19. The polyethylene film according to one of the preceding claims, wherein the ethylene homo- or copolymer (b2) LLDPE has a density (ASTM D792) in the range of 0.940±0.006 g / cm³ 3 is; preferably 0.940 ± 0.005 g / cm³ 3 , preferred 0.940±0.004 g / cm³ 3 , even more preferred 0.940±0.003 g / cm³ 3 , preferably 0.940±0.002 g / cm³ 3 , and in particular 0.940±0.001 g / cm³ 3 .

20. The polyethylene film according to one of the preceding claims, wherein the ethylene homo- or copolymer (b2) LLDPE has a VICAT softening temperature (ASTM D1 525) in the range of 125±6°C; preferably 125±5°C, more preferably 125±4°C, even more preferably 125±3°C, most preferably 125±2°C, and particularly 125±1°C.

21. The polyethylene film according to any of the preceding claims, wherein the weight fraction of the ethylene homo- or copolymer (b2) is at least 5 wt.% based on the total weight of the middle layer (B); preferably at least 7.5 wt.%, more preferably at least 10 wt.%, more preferably at least 12.5 wt.%, most preferably at least 15 wt.%, and in particular at least 17.5 wt.%.

22. The polyethylene film according to any of the preceding claims, wherein the weight fraction of the ethylene homo- or copolymer (b2) based on the total weight of the middle layer (B) is at most 35 wt.%; preferably at most 32.5 wt.%, more preferably at most 30 wt.%, more preferably at least 27.5 wt.%, most preferably at most 25 wt.%, and in particular at most 22.5 wt.%.

23. The polyethylene film according to any of the preceding claims, wherein the ethylene homo- or copolymer (b3) is selected from HDPE; preferably having a density in the range of 0.950 to 0.965 g / cm³ 3 ; preferred HDPE with a melt flow index (190°C, 2.16 kg, ASTM D1238) of not more than 5.0 g / 10 min, more preferred not more than 4.0 g / 10 min, more preferred not more than 3.0 g / 10 min, most preferred not more than 2.0 g / 10 min, and particularly not more than 1.0 g / 10 min.

24. The polyethylene film according to claim 23, wherein the ethylene homo- or copolymer (b3) HDPE has a density (ASTM D792) in the range of 0.955±0.006 g / cm³ 3 is; preferably 0.955 ± 0.005 g / cm³ 3 , preferred 0.955±0.004 g / cm³ 3 , even more preferred 0.955±0.003 g / cm³ 3 , preferably 0.955±0.002 g / cm³ 3 , and in particular 0.955±0.001 g / cm³ 3 .

25. The polyethylene film according to claim 23 or 24, wherein the ethylene homo- or copolymer (b3) is HDPE having a VICAT softening temperature (ASTM D1525) in the range of 129±6°C; preferably 129±5°C, more preferably 129±4°C, even more preferably 129±3°C, most preferably 129±2°C, and particularly 129±1°C.

26. The polyethylene film according to any one of claims 1 to 22, wherein the ethylene homo- or copolymer (b3) is selected from LDPE and LLDPE; preferably having a density in the range of 0.920 to 0.945 g / cm³ 3is; preferred LLDPE; even more preferred LLDPE with a melt flow index (190°C, 2.16 kg, ASTM D1238) of at most 5.0 g / 10 min, more preferred at most 4.0 g / 10 min, more preferred at most 3.0 g / 10 min, most preferred at most 2.0 g / 10 min, and particularly at most 1.0 g / 10 min.

27. The polyethylene film according to claim 26, wherein the ethylene homo- or copolymer (b3) LLDPE has a density (ASTM D792) in the range of 0.936 ± 0.006 g / cm³ 3 is; preferably 0.936 ± 0.005 g / cm³ 3 , preferred 0.936±0.004 g / cm³ 3 , even more preferred 0.936±0.003 g / cm³ 3 , preferably 0.936±0.002 g / cm³ 3 , and in particular 0.936±0.001 g / cm³ 3 .

28. The polyethylene film according to claim 26 or 27, wherein the ethylene homo- or copolymer (b3) is LLDPE having a VICAT softening temperature (ASTM Dl 525) in the range of 119±6°C; preferably 119±5°C, more preferably 119±4°C, even more preferably 119±3°C, most preferably 119±2°C, and particularly 119±1°C.

29. The polyethylene film according to any of the preceding claims, wherein the weight fraction of the ethylene homo- or copolymer (b3) based on the total weight of the middle layer (B) is at least 5 wt.%; preferably at least 10 wt.%, more preferably at least 15 wt.%, more preferably at least 20 wt.%, most preferably at least 25 wt.%, and in particular at least 30 wt.%.

30. The polyethylene film according to any of the preceding claims, wherein the weight fraction of the ethylene homo- or copolymer (b3) based on the total weight of the middle layer (B) is at most 60 wt.%; preferably at most 55 wt.%, more preferably at most 50 wt.%, more preferably at least 45 wt.%, most preferably at most 40 wt.%, and in particular at most 35 wt.%.

31. The polyethylene film according to one of the preceding claims, wherein the ethylene homo- or copolymer (c t ) selected from LDPE and LLDPE; preferably with a density in the range of 0.920 to 0.945 g / cm³ 3 ; preferred LDPE; even more preferred LDPE with a melt flow index (190°C, 2.16 kg, ASTM D1238) of not more than 5.0 g / 10 min, more preferred not more than 4.0 g / 10 min, more preferred not more than 3.0 g / 10 min, most preferred not more than 2.0 g / 10 min, and particularly not more than 1.0 g / 10 min.

32. The polyethylene film according to one of the preceding claims, wherein the ethylene homo- or copolymer (c LDPE) has a density (ASTM D792) in the range of 0.923±0.006 g / cm³ 3 is; preferably 0.923 ± 0.005 g / cm³ 3 , preferred 0.923±0.004 g / cm³ 3 , even more preferred 0.923±0.003 g / cm³ 3 , preferably 0.923±0.002 g / cm³ 3 , and in particular 0.923±0.001 g / cm³ 3 .

33. The polyethylene film according to any of the preceding claims, wherein the weight fraction of the ethylene homo- or copolymer (c, based on the total weight of the sealing layer (C)) is at least 20 wt.%; preferably at least 25 wt.%, more preferably at least 30 wt.%, more preferably at least 35 wt.%, most preferably at least 40 wt.%, and in particular at least 45 wt.%.

34. The polyethylene film according to any of the preceding claims, wherein the weight fraction of the ethylene homo- or copolymer (c, based on the total weight of the sealing layer (C)) is at most 80 wt.%; preferably at most 75 wt.%, more preferably at most 70 wt.%, more preferably at least 65 wt.%, most preferably at most 60 wt.%, and in particular at most 55 wt.%.

35. The polyethylene film according to any of the preceding claims, wherein the ethylene homo- or copolymer (c2) is selected from LDPE and LLDPE; preferably having a density in the range of 0.920 to 0.945 g / cm³ 3 ; preferred LLDPE; even more preferred LLDPE with a melt flow index (190°C, 2.16 kg, ASTM Dl 238) of at most 5.0 g / 10 min, more preferred at most 4.0 g / 10 min, more preferred at most 3.0 g / 10 min, most preferred at most 2.0 g / 10 min, and particularly at most 1.0 g / 10 min.

36. The polyethylene film according to one of the preceding claims, wherein the ethylene homo- or copolymer (c2) LLDPE has a density (ASTM D792) in the range of 0.940±0.006 g / cm³ 3 is; preferably 0.940 ± 0.005 g / cm³ 3 , preferred 0.940±0.004 g / cm³ 3 , even more preferred 0.940±0.003 g / cm³ 3 , preferably 0.940±0.002 g / cm³ 3 , and in particular 0.940±0.001 g / cm³ 3 .

37. The polyethylene film according to any of the preceding claims, wherein the ethylene homo- or copolymer (c2) is LLDPE having a VICAT softening temperature (ASTM Dl 525) in the range of 125±6°C; preferably 125±5°C, more preferably 125±4°C, even more preferably 125±3°C, most preferably 125±2°C, and particularly 125±1°C.

38. The polyethylene film according to any of the preceding claims, wherein the weight fraction of the ethylene homo- or copolymer (c2) based on the total weight of the sealing layer (C) is at least 10 wt.%; preferably at least 15 wt.%, more preferably at least 20 wt.%, more preferably at least 25 wt.%, most preferably at least 30 wt.%, and in particular at least 35 wt.%.

39. The polyethylene film according to any of the preceding claims, wherein the weight fraction of the ethylene homo- or copolymer (c2) based on the total weight of the sealing layer (C) is at most 70 wt.%; preferably at most 65 wt.%, more preferably at most 60 wt.%, more preferably at least 55 wt.%, most preferably at most 50 wt.%, and in particular at most 45 wt.%.

40. The polyethylene film according to one of the preceding claims, wherein the ethylene homo- or copolymers (a t), (b and (c) are each independently selected from LDPE and LLDPE; preferably with a density in the range of 0.920 to 0.945 g / cm³ 3 ; preferred LDPE; even more preferred LDPE with a melt flow index (190°C, 2.16 kg, ASTM D1238) of not more than 5.0 g / 10 min, more preferred not more than 4.0 g / 10 min, more preferred not more than 3.0 g / 10 min, most preferred not more than 2.0 g / 10 min, and particularly not more than 1.0 g / 10 min.

41. The polyethylene film according to any of the preceding claims, wherein the ethylene homo- or copolymers (a , (bi) and (c) each independently of one another are LDPE with a density (ASTM D792) in the range of 0.923±0.006 g / cm³ 3 are; preferably 0.923 ± 0.005 g / cm³ 3 , preferred 0.923±0.004 g / cm³ 3 , even more preferred 0.923±0.003 g / cm³ 3 , preferably 0.923±0.002 g / cm³ 3 , and in particular 0.923±0.001 g / cm³ 3 .

42. The polyethylene film according to any one of the preceding claims, wherein the ethylene homo- or copolymers (a2), (b2) and (c2) are each independently selected from LDPE and LLDPE; preferably with a density in the range of 0.920 to 0.945 g / cm³ 3 ; preferred LLDPE; even more preferred LLDPE with a melt flow index (190°C, 2.16 kg, ASTM Dl 238) of at most 5.0 g / 10 min, more preferred at most 4.0 g / 10 min, more preferred at most 3.0 g / 10 min, most preferred at most 2.0 g / 10 min, and particularly at most 1.0 g / 10 min.

43. The polyethylene film according to any of the preceding claims, wherein the ethylene homo- or copolymers (a2), (b2) and (c2) are each independently LLDPE with a density (ASTM D792) in the range of 0.940±0.006 g / cm³ 3 are; preferably 0.940±0.005 g / cm³ 3 , preferred 0.940±0.004 g / cm³ 3 , even more preferred 0.940±0.003 g / cm³ 3 , preferably 0.940±0.002 g / cm³ 3, and in particular 0.940±0.001 g / cm³ 3 .

44. The polyethylene film according to any one of the preceding claims, wherein the ethylene homo- or copolymers (a2), (b2) and (c2) are each independently LLDPE with a VICAT softening temperature (ASTM D1525) in the range of 125±6°C; preferably 125±5°C, more preferably 125±4°C, even more preferably 125±3°C, most preferably 125±2°C, and particularly 125±1°C.

45. The polyethylene film according to one of the preceding claims, wherein the sealing layer (A) (i) as an ethylene homo- or copolymer (a containing an LDPE with a weight fraction based on the total weight of the sealing layer (A) in the range of 50±17.5 wt.%; preferably 50±15 wt.%, more preferably 50±12.5 wt.%, more preferably 50±10 wt.%, most preferably 50±7.5 wt.% and in particular 50±5 wt.%; and (ii) comprising an LLDPE as an ethylene homo- or copolymer (a2) with a weight fraction based on the total weight of the sealing layer (A) in the range of 40±17.5 wt.%; preferably 40±15 wt.%, more preferably 40±12.5 wt.%, more preferably 40±10 wt.%, most preferably 40±7.5 wt.% and in particular 40±5 wt.%.

46. ​​The polyethylene film according to any of the preceding claims, wherein the sealing layer (A), if any, contains at most 12.5 wt.% polymers, based on the total weight of the sealing layer (A), which are neither LDPE nor LLDPE; preferably at most 10 wt.%, more preferably at most 7.5 wt.%, even more preferably at most 5 wt.%, most preferably at most 2.5 wt.%, and in particular no polymers at all, which are neither LDPE nor LLDPE.

47. The polyethylene film according to one of the preceding claims, wherein the sealing layer (A) has a layer thickness in the range of 1.5 to 12.5 pm.

48. The polyethylene film according to one of the preceding claims, wherein the middle layer (B) (i) comprising an ethylene homo- or copolymer (bi) an LDPE with a weight fraction based on the total weight of the middle layer (B) in the range of 45±17.5 wt.%; preferably 45±15 wt.%, more preferably 45±12.5 wt.%, more preferably 45±10 wt.%, most preferably 45±7.5 wt.% and in particular 45±5 wt.%; (ii) comprising an LLDPE as an ethylene homo- or copolymer (b2) with a weight fraction based on the total weight of the middle layer (B) in the range of 20 ± 17.5 wt.%; preferably 20 ± 15 wt.%, more preferably 20 ± 12.5 wt.%, more preferably 20 ± 10 wt.%, most preferably 20 ± 7.5 wt.% and in particular 20 ± 5 wt.%; and (iii) as ethylene homo- or copolymer (b3) comprising an HDPE with a weight fraction based on the total weight of the middle layer (B) in the range of 30±17.5 wt.%; preferably 30±15 wt.%, more preferably 30±12.5 wt.%, more preferably 30±10 wt.%, most preferably 30±7.5 wt.% and in particular 30±5 wt.%.

49. The polyethylene film according to any one of claims 1 to 47, wherein the middle layer (B) (i) comprising an ethylene homo- or copolymer (bi) an LDPE with a weight fraction based on the total weight of the middle layer (B) in the range of 15 ± 12.5 wt.%; preferably 15 ± 10 wt.%, more preferably 15 ± 7.5 wt.%, more preferably 15 ± 5.0 wt.%, most preferably 15 ± 2.5 wt.% and in particular 15 ± 1.0 wt.%; and (ii) comprising an LLDPE or several different LLDPEs as an ethylene homo- or copolymer (b2) with a weight fraction based on the total weight of the middle layer (B) in the range of 75±17.5 wt.%; preferably 75±15 wt.%, more preferably 75±12.5 wt.%, more preferably 75±10 wt.%, most preferably 75±7.5 wt.% and in particular 75±5 wt.%.

50. The polyethylene film according to any one of claims 1 to 47, wherein the middle layer (B) (i) as an ethylene homo- or copolymer (b) containing an LDPE with a weight fraction based on the total weight of the middle layer (B) in the range of 15±12.5 wt.%; preferably 15±10 wt.%, more preferably 15±7.5 wt.%, more preferably 15±5.0 wt.%, most preferably 15±2.5 wt.% and in particular 15±1.0 wt.%; (ii) comprising a first LLDPE as an ethylene homo- or copolymer (b2) with a weight fraction based on the total weight of the middle layer (B) in the range of 20±17.5 wt.%; preferably 20±15 wt.%, more preferably 20±12.5 wt.%, even more preferably 20±10 wt.%, most preferably 20±7.5 wt.% and in particular 20±5 wt.%; and (iii) comprising a second LLDPE, which differs from the first LLDPE, as an ethylene homo- or copolymer (b3), with a weight fraction based on the total weight of the middle layer (B) in the range of 55±17.5 wt.%; preferably 55±15 wt.%, more preferably 55±12.5 wt.%, more preferably 55±10 wt.%, most preferably 55±7.5 wt.% and in particular 55±5 wt.%.

51. The polyethylene film according to claim 50, wherein the first LLDPE (b2) and the second LLDPE (b3) preferably differ from each other in at least one property selected from comonomer besides ethylene, density, melt flow index (MFI, 190°C, 2.16 kg) and VICAT softening temperature.

52. The polyethylene film according to claim 51, wherein (i) the first LLDPE (b2) includes octene as a comonomer in addition to ethylene and the second LLDPE (b3) includes hexene as a comonomer in addition to ethylene; and / or (ii) the density of the first LLDPE (b2) is greater than the density of the second LLDPE (b3); and / or (iii) the melt flow index of the first LLDPE (b2) is greater than the melt flow index of the second LLDPE (b3); and / or (iv) the VICAT softening temperature of the first LLDPE (b2) is higher than the VICAT softening temperature of the second LLDPE (b3).

53. The polyethylene film according to any of the preceding claims, wherein the middle layer (B), if any, contains at most 12.5 wt.% of polymers, based on the total weight of the middle layer (B), which are neither LDPE nor LLDPE nor HDPE; preferably at most 10 wt.%, more preferably at most 7.5 wt.%, even more preferably at most 5 wt.%, most preferably at most 2.5 wt.%, and in particular no polymers at all, which are neither LDPE nor LLDPE nor HDPE.

54. The polyethylene film according to any of the preceding claims, wherein the middle layer (B), if any, contains at most 12.5 wt.% polymers which are neither LDPE nor LLDPE, based on the total weight of the middle layer (B); preferably at most 10 wt.%, more preferably at most 7.5 wt.%, even more preferably at most 5 wt.%, most preferably at most 2.5 wt.%, and in particular no polymers which are neither LDPE nor LLDPE.

55. The polyethylene film according to any of the preceding claims, wherein the middle layer (B) has a layer thickness in the range of 3 to 25 pm, preferably 5 to 20 pm.

56. The polyethylene film according to one of the preceding claims, wherein the sealing layer (C) (i) as an ethylene homo- or copolymer (c) comprising an LDPE with a weight fraction based on the total weight of the sealing layer (C) in the range of 50 ± 17.5 wt.%; preferably 50 ± 15 wt.%, more preferably 50 ± 12.5 wt.%, more preferably 50 ± 10 wt.%, most preferably 50 ± 7.5 wt.% and in particular 50 ± 5 wt.%; and (ii) comprising an LLDPE as an ethylene homo- or copolymer (c2) with a weight fraction based on the total weight of the sealing layer (C) in the range of 40±17.5 wt.%; preferably 40±15 wt.%, more preferably 40±12.5 wt.%, more preferably 40±10 wt.%, most preferably 40±7.5 wt.% and in particular 40±5 wt.%.

57. The polyethylene film according to any of the preceding claims, wherein the sealing layer (C), if any, contains at most 12.5 wt.% polymers which are neither LDPE nor LLDPE, based on the total weight of the sealing layer (C); preferably at most 10 wt.%, more preferably at most 7.5 wt.%, even more preferably at most 5 wt.%, most preferably at most 2.5 wt.%, and in particular no polymers which are neither LDPE nor LLDPE.

58. The polyethylene film according to one of the preceding claims, wherein the sealing layer (C) has a layer thickness in the range of 1.5 to 12.5 pm.

59. The polyethylene film according to any of the preceding claims, wherein the polyethylene film contains, if any, at most a total of 12.5 wt.% polymers, based on the total weight of the polyethylene film, which are neither LDPE nor LLDPE nor HDPE; preferably at most 10 wt.%, more preferably at most 7.5 wt.%, even more preferably at most 5 wt.%, most preferably at most 2.5 wt.%, and in particular no polymers at all, which are neither LDPE nor LLDPE nor HDPE.

60. The polyethylene film according to one of the preceding claims, which has a symmetrical layer structure with regard to the sealing layer (A), the middle layer (B) and the sealing layer (C).

61. The polyethylene film according to one of the preceding claims, which, in addition to the sealing layer (A) optionally coated with the release coating, the middle layer (B) and the sealing layer (C), does not comprise any further layers.

62. The polyethylene film according to any of the preceding claims, which has a total layer thickness of at least 10 pm.

63. The polyethylene film according to any of the preceding claims, which has a total layer thickness of at most 45 pm, preferably at most 40 pm, more preferably at most 35 pm, most preferably at most 30 pm and in particular at most 25 pm.

64. The polyethylene film according to one of the preceding claims, wherein the ratio of the layer thicknesses of the sealing layer (A), the middle layer (B) and the sealing layer (C) is in the range of 1:1.5:1 to 1:3.5:1, preferably about 1:2:

1.

65. The polyethylene film according to any one of the preceding claims, wherein the sealing layer (A), the middle layer (B) and / or the sealing layer (C) independently contains at least one additive; preferably selected from the group consisting of pigments, fillers such as CaCO3; plasticizers; lubricants; emulsifiers; pigments; rheology additives; catalysts; flow control agents; optical brighteners; light stabilizers; antioxidants; clarifying agents such as substituted or unsubstituted bisbenzylidene sorbites; flame retardants; and other additives. tistatic agents; UV absorbers such as benzoxazinones; propellants; and thiosynergists, such as thiodipropionic acid dilaurylestem or thiodipropionic acid distearylestem.

66. The polyethylene film according to any of the preceding claims, wherein the sealing layer (A) contains, if any, at most 14 wt.% inorganic components based on the total weight of the sealing layer (A); preferably at most 13 wt.%, more preferably at most 12 wt.%, even more preferably at most 11 wt.%, most preferably 10 wt.% and in particular at most 9 wt.%.

67. The polyethylene film according to one of the preceding claims, wherein the sealing layer (A) contains at most 2.5 wt.% inorganic components based on the total weight of the sealing layer (A); preferably at most 2.0 wt.%, more preferably at most 1.5 wt.%, even more preferably at most 1.0 wt.%, most preferably 0.5 wt.% and in particular at most 0.1 wt.%.

68. The polyethylene film according to any of the preceding claims, wherein the middle layer (B), if any, contains at most 19 wt.% inorganic components based on the total weight of the middle layer (B); preferably at most 18 wt.%, more preferably at most 17 wt.%, even more preferably at most 16 wt.%, most preferably 15 wt.% and in particular at most 14 wt.%.

69. The polyethylene film according to any of the preceding claims, wherein the sealing layer (C) contains, if any, at most 14 wt.% inorganic components based on the total weight of the sealing layer (C); preferably at most 13 wt.%, more preferably at most 12 wt.%, even more preferably at most 11 wt.%, most preferably 10 wt.% and in particular at most 9 wt.%.

70. The polyethylene film according to one of the preceding claims, wherein the sealing layer (C) contains at most 2.5 wt.% inorganic components based on the total weight of the sealing layer (C); preferably at most 2.0 wt.%, more preferably at most 1.5 wt.%, even more preferably at most 1.0 wt.%, most preferably 0.5 wt.% and in particular at most 0.1 wt.%.

71. The polyethylene film according to any of the preceding claims, wherein the polyethylene film contains, if any, at most a total of 5.0 wt.% inorganic components based on the total weight of the polyethylene film; preferably at most 4.5 wt.%, more preferably at most 4.0 wt.%, even more preferably at most 3.5 wt.%, most preferably 3.0 wt.% and in particular at most 2.5 wt.%.

72. The polyethylene film according to one of the preceding claims, wherein the sealing layer (A) and the sealing layer (C) each have a substantially smooth surface.

73. The polyethylene film according to any one of claims 1 to 71, which is structured, preferably embossed.

74. The polyethylene film according to one of the preceding claims, which has a total layer thickness in the range of 10 to 25 pm, preferably 10 to 20 pm.

75. The polyethylene film according to any one of claims 1 to 73, which has a total layer thickness in the range of 25 to 40 pm, preferably 20 to 40 pm.

76. The polyethylene film according to one of the preceding claims, wherein the release coating has a basis weight of at most 0.65 g / m² 2 exhibits; preferably not more than 0.60 g / m³ 2 , preferably not more than 0.55 g / m³ 2 , preferably no more than 0.50 g / m² 2 , preferably no more than 0.45 g / m² 2 , and in particular a maximum of 0.40 g / m² 2 ; preferably not more than 0.35 g / m³ 2 , preferably not more than 0.30 g / m² 2 , preferably no more than 0.25 g / m² 2, preferably no more than 0.20 g / m² 2 .

77. The polyethylene film according to any of the preceding claims, wherein the release coating is based on at least one cured polysiloxane selected from the group consisting of (i) addition-crosslinked, preferably metal-catalyzed addition-crosslinked, condensation-crosslinked, radically crosslinked, and / or cationically crosslinked polysiloxanes; preferably radically crosslinked polysiloxanes; and / or (ii) Polydialkylsiloxanes, preferably polydimethylsiloxanes; and polyalkylarylsiloxanes, preferably polymethylphenylsiloxanes; preferably chemically cross-linked acrylate-functionalized polysiloxanes; preferably chemically cross-linked acrylate-functionalized polydialkylsiloxanes, preferably chemically cross-linked acrylate-functionalized polydimethylsiloxanes; or chemically cross-linked acrylate-functionalized polyalkylarylsiloxanes, preferably chemically cross-linked acrylate-functionalized polymethylphenylsiloxanes.

78. The polyethylene film according to one of the preceding claims, wherein the polyethylene film is blown film co-extruded.

79. The polyethylene film according to one of the preceding claims, wherein the sealing layer (A) is at least partially printed with a printed image on its outer surface.

80. The polyethylene film according to Anspmch 79, wherein the sealing layer (A) is additionally coated at least partially with a release coating on its outer surface.

81. The polyethylene film according to specification 80, wherein there are surface sections which are both printed with a printed image and coated with a release coating, and wherein the The printed image is positioned between the outer surface of the sealing layer (A) and the release coating.

82. The polyethylene film according to one of the preceding claims, wherein the sealing layer (C) is at least partially printed with a printed image on its outer surface.

83. Use of a polyethylene film according to one of the preceding claims as packaging material, preferably for packaging hygiene articles; more preferably sanitary napkins or tampon applicators.

84. A packaging comprising a hygiene article as the packaging item, preferably a sanitary napkin or a tampon applicator, and a polyethylene film according to any one of claims 1 to 82 as the packaging material.

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