Entegris has been granted a patent for composite hollow fiber filter membranes with a porous polymeric support and filter layer. The filter exhibits high retention rates and is designed for filtering solvents like PGME and PGMEA. The porous polymeric filter layer is resistant to these solvents. GlobalData’s report on Entegris 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 Entegris, 3D memory devices was a key innovation area identified from patents. Entegris's grant share as of May 2024 was 45%. Grant share is based on the ratio of number of grants to total number of patents.
Composite hollow fiber filter membrane with porous polymeric filter layer
A recently granted patent (Publication Number: US11998878B2) discloses a composite hollow fiber filter membrane designed for filtering solvents like propylene glycol methyl ether (PGME), propylene glycol methylether acetate (PGMEA), and cyclohexanone. The membrane comprises a polymeric, microporous, hollow fiber support with an outer surface, inner surface, and micropores, along with a porous polymeric filter layer that is not cured. The filter layer has a porosity ranging from 60% to 85% and includes pores with an average size between 10 nanometers to 8 microns. The composite membrane demonstrates a retention rate exceeding 90% for various monolayer coverages. The coagulated polymer used in the filter layer includes materials like polyimides, polyamides, polyamide-imides, and polysulfones, providing resistance to the specified solvents.
The method of preparing this composite hollow fiber filter membrane involves coating the polymer solution on the outer surface of the hollow fiber support and then contacting it with a coagulation solution to form the filter layer. The process ensures that the filter layer penetrates partially into the thickness of the support, enhancing its filtration capabilities. The membrane's structure allows for a flux ranging from 20 to 8000 LMH/bar and a bubble point between 50-500 psi, measured using ethoxy-nonafluorobutane (HFE 7200) at 25 degrees Celsius. Additionally, the patent details the preparation method, including steps like passing the support through an annular die and allowing for evaporation of the polymer solution coating before coagulation. The filter's design and composition make it suitable for efficient solvent filtration while maintaining high retention rates and resistance to the specified solvents.
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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.
