Exxon Mobil has been granted a patent for polyolefin compositions and films, featuring a specific blend of BOCD polyethylene and polypropylene. The films exhibit enhanced mechanical properties, including high flexural modulus and impact resistance, suitable for various applications. The film thickness ranges from 10 µm to 300 µm. GlobalData’s report on Exxon Mobil gives a 360-degree view of the company including its patenting strategy. Buy the report here.
According to GlobalData’s company profile on Exxon Mobil, Microscale biofuel reactors was a key innovation area identified from patents. Exxon Mobil's grant share as of July 2024 was 68%. Grant share is based on the ratio of number of grants to total number of patents.
Polyolefin films with specific mechanical properties and compositions
The granted patent US12071534B2 describes a specialized film characterized by a thickness ranging from approximately 10 µm to 300 µm. This film features a core layer situated between two skin layers, with the core layer and at least one of the skin layers composed of a polyolefin composition. The polyolefin composition includes a broad orthogonal composition distribution (BOCD) polyethylene, which consists of 70 mol % to 100 mol % ethylene. Key properties of the BOCD polyethylene include a density between 0.91 g/cm³ and 0.925 g/cm³, a branching index of 0.98 or higher, and specific molecular weight characteristics determined through cross-fractionation chromatography. Additionally, the composition incorporates trimmed polypropylene (tPP) derived from high melt strength polypropylene (HMS PP) with a minimum melt strength of 20 cN.
Further claims detail the composition ratios within the polyolefin, specifying that the BOCD polyethylene can constitute 40 wt % to 95 wt % of the total polyolefin composition, while polypropylene can range from 5 wt % to 60 wt %. The film's mechanical properties are also highlighted, with a 1% secant flexural modulus in both machine direction (MD) and transverse direction (TD) specified between 300 MPa to 1,200 MPa. Additional variations of the BOCD polyethylene's density and branching index are provided, along with the option to include linear low-density polyethylene (LLDPE) in the composition, which can account for 10 wt % to 40 wt % of the polyolefin composition and may include ethylene and C3 to C10 alpha-olefin derived units.
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