Daio Paper has patented a method for producing cellulose nanofibers with superior strength. By refining pulp fibers in a slurry using a high-pressure homogenizer, the method minimizes the decrease in molecular weight of cellulose. The resulting cellulose nanofibers exhibit enhanced properties. GlobalData’s report on Daio Paper 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 Daio Paper, Incontinence monitoring sensors was a key innovation area identified from patents. Daio Paper's grant share as of February 2024 was 76%. Grant share is based on the ratio of number of grants to total number of patents.

Method for producing cellulose nanofibers with superior strength

Source: United States Patent and Trademark Office (USPTO). Credit: Daio Paper Corp

A recently granted patent (Publication Number: US11905657B2) discloses a method for producing cellulose nanofibers. The method involves pretreating pulp fibers in a slurry and then refining them using a high-pressure homogenizer. Notably, the pretreating step involves coarsely fibrillating the pulp fibers without any chemical treatment. The pulp fibers that undergo pretreating and are subsequently refined have a fines content of 50% or more. Furthermore, the weight average molecular weight of the cellulose nanofibers obtained through the refining process is required to be 65% or more of the weight average molecular weight of the cellulose in the pulp fibers before pretreating.

Additionally, the patent claim specifies that the mode diameter of the cellulose nanofibers in a pseudo-particle size distribution curve should be 40 µm or less. This parameter further refines the process for producing cellulose nanofibers, ensuring a specific size distribution of the resulting nanofibers. By outlining these specific requirements and steps, the patent aims to protect a method that can efficiently produce cellulose nanofibers with desired characteristics, potentially offering advancements in various industries where cellulose nanofibers are utilized.

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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.