According to GlobalData’s company profile on SK, UAV battery thermal mgmt was a key innovation area identified from patents. SK's grant share as of September 2023 was 39%. Grant share is based on the ratio of number of grants to total number of patents.

A recently granted patent (Publication Number: US11773221B2) describes a polyimide-based film with specific properties and applications. The film has a maximum and minimum intensity difference (?I) of 0.6 arbitrary units (AU) or less when measured using Raman spectroscopy with specific parameters. Additionally, the film has a degree of curl of 5 mm or less.

The patent also specifies various characteristics of the polyimide-based film. It should have a light transmittance of 5% or more at 388 nm and a total light transmittance of 87% or more at 400 to 700 nm, as measured according to ASTM D1746. The film should also have a haze of 2.0% or less, a yellow index of 5.0 or less, and a b* value of 2.0 or less.

Furthermore, the film should have a modulus of 3 GPa or more and an elongation at break of 8% or more, as measured according to ASTM D882. The thickness of the film should be between 10 to 500 µm.

The polyimide-based film is formed of a polyimide-based resin with a polyamide-imide structure. The resin may contain a unit derived from a fluorine-based aromatic diamine and/or a unit derived from a cycloaliphatic dianhydride. In some embodiments, the resin may also contain a unit derived from an aromatic dianhydride and/or an aromatic diacid dichloride.

The patent also describes the use of the polyimide-based film in various applications. It can be used as a window cover film, with the option of adding a coating layer for specific functionalities such as antistatic, anti-fingerprint, anti-fouling, anti-scratch, low refractive, anti-reflection, or impact absorption properties. Additionally, the film can be used in flexible display panels.

In summary, the granted patent outlines the specifications and potential applications of a polyimide-based film. The film exhibits specific intensity and curl characteristics, along with desirable optical properties and mechanical strength. Its composition includes a polyamide-imide structure and may incorporate various units derived from different compounds. The film can be used as a window cover with additional coating layers or in flexible display panels.

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GlobalData’s Patent Analytics tracks patent filings and grants from official offices around the world. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.