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US 2026/0234380 A1Published application
Polyethylene blend for a film layer
AssigneeBorealis AG
InventorsJingbo Wang, Friedrich Berger
Life of this patent
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Abstract
Polyethylene blend of a specific multimodal metallocene catalysed linear low density polyethylene (mLLDPE) and a specific high density polyethylene, produced in the presence of a Ziegler-Natta catalyst (znHDPE), which provides films with well-balanced properties, especially stiffness/impact balance.
Claims15
A polyethylene blend comprising:
- a) 55.0 wt % to 99.0 wt %, based on the total weight of the polyethylene blend, of a multimodal metallocene catalysed linear low density polyethylene (mLLDPE) which consists of an in-situ blend of:
- (i) 30.0 to 70.0 wt % of an ethylene-1-butene polymer component (A);
- and
- (ii) 70.0 to 30.0 wt % of an ethylene-1-hexene polymer component (B);
- wherein the ethylene-1-butene polymer component (A) comprises:
- a density (ISO 1183) in the range of 925 to 965 kg/m3;
- a MFR2 (190° C., 2.16 kg, ISO 1133) in the range of 1.0 to 400.0 g/10 min;
- the ethylene-1-hexene polymer component (B) comprises:
- a density (ISO 1183) in the range of 880 to 915 kg/m3;
- a MFR2 (190° C., 2.16 kg, ISO 1133) in the range of 0.001 to 1.0 g/10 min;
- wherein the multimodal metallocene catalysed linear low density polyethylene (mLLDPE) comprises:
- a density (ISO 1183) in the range of 910 to 925 kg/m3;
- a MFR2 (190° C., 2.16 kg, ISO 1133) in the range of 0.1 to 5.0 g/10 min;
- and
- b) 1.0 to 45.0 wt %, based on the total weight of the polyethylene blend, of a trimodal high density polyethylene, produced in the presence of a Ziegler-Natta catalyst (znHDPE), wherein said znHDPE comprises:
- a density (ISO 1183) in the range of 950 to 975 kg/m3;
- a MFR2 (190° C., 2.16 kg, ISO 1133) in the range of 0.1 to 2.0 g/10 min, and
- wherein the znHDPE consists of an in-situ blend of
- (iii) 35.0 to 60.0 wt % of a high density polymer component (C) consisting of:
- 30.0 to 70.0 wt % of a high density fraction (C-1);
- and
- 70.0 to 30.0 wt % of a high density fraction (C-2);
- and
- (i-v) 65.0 to 40.0 wt % of a lower density polymer component (D),
- wherein the high density polymer component (C) comprises:
- a density (ISO 1183) in the range of 950 to 980 kg/m3;
- a MFR2 (190° C., 2.16 kg, ISO 1133) in the range of 150.0 to 1000.0 g/10 min;
- and
- the lower density polymer component (D) comprises:
- a density (ISO 1183) in the range of 940 to 970 kg/m3;
- a MFR2 (190° C., 2.16 kg, ISO 1133) in the range of 0.0001 to 0.5 g/10 min;
- the density of polymer component (D) being lower than the density of polymer component (C).
29 more elements
Dependencies are inferred from the claim text.