Mitsubishi Paper Mills has patented a semipermeable membrane support made of polyolefin-based fibers for enhanced durability during washing and backwashing. The support, a wet-laid nonwoven fabric, ensures optimal adhesion for semipermeable membranes. The patented technology offers improved performance and longevity in various applications. GlobalData’s report on Mitsubishi Paper Mills 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 Mitsubishi Paper Mills, Corrosion resistant battery packaging was a key innovation area identified from patents. Mitsubishi Paper Mills's grant share as of May 2024 was 24%. Grant share is based on the ratio of number of grants to total number of patents.
Semipermeable membrane support using polyolefin-based fibers
The granted patent (Publication Number: US11998879B2) discloses a semipermeable membrane support for forming a semipermeable membrane, utilizing a wet-laid nonwoven fabric made of core-sheath type conjugate fibers. These fibers consist of polypropylene as the core component and polyethylene as the sheath component, with specific characteristics such as an average fiber diameter between 9 µm to 11 µm. The coating surface of the support exhibits Bekk smoothness and 75° mirror surface glossiness higher than the non-coating surface, with specific ranges for smoothness and glossiness ratios. The 75° mirror surface glossiness in both machine direction (MD) and cross direction (CD) of the coating surface also have defined ranges, along with ratios compared to the non-coating surface.
This innovative semipermeable membrane support offers a unique combination of material composition and surface properties to enhance the performance of semipermeable membranes. By utilizing core-sheath type conjugate fibers with specific characteristics, the support provides improved smoothness and glossiness on the coating surface where the membrane is formed. The defined ranges for smoothness, glossiness, and their ratios ensure optimal conditions for membrane formation and functionality. This patent highlights the importance of surface properties in membrane technology and offers a novel solution to enhance membrane performance through the design of the support material.
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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.
