US 11,926,531 B2
Flaky alumina particles and method for producing flaky alumina particles
Shingo Takada, Sakura (JP); Kazuo Itoya, Sakura (JP); Jian-Jun Yuan, Sakura (JP); Takayuki Kanematsu, Sakura (JP); Masamichi Hayashi, Sakura (JP); Fumihiko Maekawa, Sakura (JP); and Yoshiyuki Sano, Sakura (JP)
Assigned to DIC Corporation, Tokyo (JP)
Appl. No. 17/259,932
Filed by DIC Corporation, Tokyo (JP)
PCT Filed Jul. 26, 2018, PCT No. PCT/JP2018/028068
§ 371(c)(1), (2) Date Jan. 13, 2021,
PCT Pub. No. WO2020/021675, PCT Pub. Date Jan. 30, 2020.
Prior Publication US 2021/0291272 A1, Sep. 23, 2021
Int. Cl. B32B 5/30 (2006.01); B22F 1/05 (2022.01); B22F 9/30 (2006.01); C01F 7/442 (2022.01); C04B 35/185 (2006.01); C04B 35/65 (2006.01)
CPC C01F 7/442 (2013.01) [B22F 1/05 (2022.01); B22F 9/30 (2013.01); B32B 5/30 (2013.01); C04B 35/185 (2013.01); C04B 35/65 (2013.01); B22F 2302/253 (2013.01); B22F 2302/256 (2013.01); B22F 2304/10 (2013.01); B32B 2255/04 (2013.01)] 9 Claims
 
1. Flaky alumina particles comprising a surface layer in which mullite is exclusively present, wherein
as determined by XRD analysis, a ratio of a peak intensity of the mullite observed at 2θ=26.2±0.2° to a peak intensity of a (104) face of α-alumina observed at 2θ=35.1±0.2° is greater than or equal to 0.02, and
the flaky alumina particles have a pH of an isoelectric point of 2 to 5 as determined by measurement of a zeta potential, the isoelectric point being a point at which a potential is zero.