Nippon Paper Industries has patented a dispersion composition featuring a water-based medium and carboxymethyl cellulose with specific substitution and crystallinity criteria. The method involves mixing and stirring the components to achieve a high-viscosity product with defined particle size and viscosity parameters. GlobalData’s report on Nippon Paper Industries 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 Nippon Paper Industries, Sustainable packaging paper coating was a key innovation area identified from patents. Nippon Paper Industries's grant share as of June 2024 was 41%. Grant share is based on the ratio of number of grants to total number of patents.
The patent US12031016B2 outlines a method for producing a dispersion composition that involves two primary steps. In the first step, a mixture is prepared using carboxymethyl cellulose (CMC) with a degree of carboxymethyl substitution of 0.20 or higher and a crystallization degree of cellulose type I of 50% or more, combined with a water-based medium. The second step involves stirring this mixture at a rotational speed between 8000 to 15000 rpm for at least one minute, resulting in a dispersion composition. The final product features carboxymethyl cellulose with a median diameter ranging from 10.0 to 150.0 µm and a viscosity of 1000 mPa·s to 30000 mPa·s at a solid content of 1% (w/v) at 25°C.
Further claims detail specific characteristics of the dispersion composition. For instance, the median diameter of the carboxymethyl cellulose before and after stirring must satisfy a defined ratio, ensuring consistency in particle size. Additionally, the viscosity can vary, with an alternative specification allowing for a viscosity range of 100 mPa·s to 10000 mPa·s at the same solid content. The method also includes a preparatory step where a mercerizing agent is added to cellulose in a primarily water-based solvent, followed by the introduction of a carboxymethylating agent in a mixed solvent of water and an organic solvent to create the carboxymethyl cellulose. This patent presents a systematic approach to producing a specific dispersion composition with defined physical properties, which may have applications in various industries.
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