US 12,281,019 B2
Boron-containing amorphous silica powder and method of producing same
Yasuyuki Murakami, Osaka (JP); Satsuki Motoishi, Osaka (JP); Hisao Koizumi, Osaka (JP); Satoshi Komori, Fukushima (JP); and Hironobu Ogata, Fukushima (JP)
Assigned to Sakai Chemical Industry Co., Ltd., Osaka (JP)
Appl. No. 18/247,242
Filed by SAKAI CHEMICAL INDUSTRY CO., LTD., Sakai (JP)
PCT Filed Sep. 21, 2021, PCT No. PCT/JP2021/034575
§ 371(c)(1), (2) Date Mar. 29, 2023,
PCT Pub. No. WO2022/071021, PCT Pub. Date Apr. 7, 2022.
Claims priority of application No. 2020-167312 (JP), filed on Oct. 1, 2020.
Prior Publication US 2023/0365419 A1, Nov. 16, 2023
Int. Cl. C01B 33/193 (2006.01)
CPC C01B 33/193 (2013.01) [C01P 2002/02 (2013.01); C01P 2002/54 (2013.01); C01P 2002/88 (2013.01); C01P 2004/04 (2013.01); C01P 2004/64 (2013.01); C01P 2006/12 (2013.01)] 12 Claims
OG exemplary drawing
 
1. An amorphous silica powder comprising boron atoms,
the amorphous silica powder having an average particle size in a range from 10 to 100 nm, as determined from 40 particles selected at random in a transmission electron micrograph,
the amorphous silica powder having a decrement in a boron content in a range of 10 mass % or less, when fired under following conditions:
5 to 10 g of a dried product of the amorphous silica powder is filled into an alumina crucible, heated in an atmosphere at 200° C./hour to a temperature in a range from 1000° C. to 1100° C., maintained as is for 5 hours, and cooled to room temperature,
wherein the decrement is determined by a formula below:
the decrement (%)=(B2O3 content in the dried product of the amorphous silica powder−B2O3 content in a fired product of the amorphous silica powder)/(the B2O3 content in the dried product of the amorphous silica powder)×100.