Oji has patented a biaxially stretched polypropylene film with specific thickness, tensile fracture stress, and temperature parameters. The film is produced through a detailed process involving preheating, stretching, and relaxing the cast roll stock sheet. GlobalData’s report on Oji gives a 360-degree view of the company including its patenting strategy. Buy the report here.

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According to GlobalData’s company profile on Oji, Incontinence monitoring sensors was a key innovation area identified from patents. Oji's grant share as of March 2024 was 22%. Grant share is based on the ratio of number of grants to total number of patents.

Patent granted for biaxially stretched polypropylene film production

Source: United States Patent and Trademark Office (USPTO). Credit: Oji Holdings Corp

A recently granted patent (Publication Number: US11961683B2) discloses a method for producing a biaxially stretched polypropylene film with specific characteristics. The process involves preheating a cast roll stock sheet, stretching it in the machine direction, and then relaxing it to achieve a film with a thickness ranging from 1.0 µm to 3.5 µm. The resulting film exhibits a tensile fracture stress of 70 MPa or more at 135°C in a specific direction, along with controlled dimensional change rates at different temperatures. Additionally, the film has a crystallite size of 12.20 nm or less, making it suitable for applications such as capacitors.

Furthermore, the patent also covers the use of the biaxially stretched polypropylene film in a metallized film structure, where a metal layer is laminated onto the film. This metallized film can be further processed into a roll form for ease of handling and storage. The patent extends to film capacitors incorporating the metallized film, emphasizing the importance of the specific production method outlined in the claims to achieve desired mechanical and thermal properties. The method involves precise temperature and contact time parameters during preheating, stretching, and relaxing stages, ensuring the film meets the required tensile fracture stress criteria at different temperatures. Overall, the patent highlights a comprehensive approach to producing high-quality biaxially stretched polypropylene films with controlled characteristics for various industrial applications.

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GlobalData, the leading provider of industry intelligence, provided the underlying data, research, and analysis used to produce this article.

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.