Wendel has filed a patent for a composite film for lids, featuring an aluminum layer and an extrusion layer with a sealing layer and adhesion promoter layer. The sealing layer includes a polymer matrix with specific polymer constituents and a peel-force additive. The film is produced through coextrusion with precise thickness specifications. GlobalData’s report on Wendel gives a 360-degree view of the company including its patenting strategy. Buy the report here.

According to GlobalData’s company profile on Wendel, was a key innovation area identified from patents. Wendel's grant share as of January 2024 was 58%. Grant share is based on the ratio of number of grants to total number of patents.

Composite film for lids with aluminum and polymer layers

Source: United States Patent and Trademark Office (USPTO). Credit: Wendel SE

The patent application (Publication Number: US20240025152A1) describes a composite film designed for packaging applications. The film consists of an aluminum layer and a sealing layer with a polymer matrix containing specific polymer constituents and a peel-force additive. The composite film is created through coextrusion, with an extrusion layer comprising the sealing layer and an adhesion promoter layer. The total thickness of the extrusion layer ranges from 10 to 18 g/m2, with specific thickness ranges for the adhesion promoter and sealing layers.

Furthermore, the patent application details the production method for the composite film, involving the extrusion of multiple layers onto the aluminum layer. The method includes the specific composition of the polymer matrix, the proportion of polymer constituents, and the thickness specifications for each layer. The resulting composite film can be used to create lids for packaging containers, offering a secure and efficient sealing solution. Additionally, the method allows for the production of lids by punching or cutting out from the composite film, ensuring versatility in packaging applications. The patent application also highlights the use of specific additives, such as talcum, and the option to use low-density polyethylene as the first polymer constituent for enhanced performance.

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GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. 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.