MUMBAI, India, Sept. 22 -- Intellectual Property India has published a patent application (202617086044 A) filed by Nippon Steel Corporation on July 14, 2026, for Magnesium Oxide Powder, Method For Producing Magnesium Oxide Powder, Method For Producing Magnesium Oxide Particles, And Method For Producing Grain-Oriented Electromagnetic Steel Sheet.
Inventors include Yamagata Ryutaro; Takeda Kazutoshi; and Takahashi Takafumi.
The application for the patent was published on September 18, 2026, under issue no. 38/2026.
Abstract: This magnesium oxide (MgO) powder is for an annealing separator, and contains B at 0.030 mass% or more but less than 0.250 mass%. When the particles constituting the MgO powder are classified by a classifier with a classification point of D50, and of the total particles, the MgO particles having an average particle diameter of less than 0.8 µm are classified as small-diameter particles and the MgO particles having an average particle diameter of 0.8 µm or more are classified as large-diameter particles, it is found that: Bs, which is the B content included in the small-diameter particles, is 0.0020 or more but less than 0.0800 mass%; Bl, which is the B content included in the large-diameter particles, is 0.0400 mass% or more but less than 0.3000 mass%; the proportion of the small-diameter particles to the total particles is 5 to 80 mass%; and Bl/Bs, which is the ratio of Bl to Bs, is 1.05 to 30.0.
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