MUMBAI, India, June 6 -- Intellectual Property India has published a patent application (202417076858 A) filed by Resonac Corporation, Tokyo, on Oct. 10, 2024, for 'polycrystalline alumina abrasive grains, method for producing same, and grindstone.'
Inventor(s) include Tanaka Seiji; and Yamada Jiro.
The application for the patent was published on June 6, under issue no. 23/2025.
According to the abstract released by the Intellectual Property India: "To provide polycrystalline alumina abrasive grains having a small alumina crystal grain size and excellent polishing and grinding performance, a production method capable of producing the polycrystalline alumina abrasive grains at low cost, and a grindstone using the polycrystalline alumina abrasive grains. Polycrystalline alumina abrasive grains having an alumina content of 95.0 mass% or more, a silica content of 0.05-3.30 mass%, a crystal grain size of 0.100-0.400 m, and a Vickers hardness of 21.00 or more are obtained by a production method including: a step for obtaining a mixed liquid of pseudoboehmite, a specified silica, and water; a step for adding a deflocculating agent to the mixed liquid to obtain a sol; a step for adding an alumina seed to the sol to obtain a seed-containing sol; a step for crushing a dried residue of the seed-containing sol, and then calcining at from 550 C to less than 1200 C; and a step for firing at 1200-1500 C."
The patent application was internationally filed on June 18, 2024, under International application No.PCT/JP2024/021967.
Disclaimer: Curated by HT Syndication.
