US 12,454,460 B2
Spherical silica particles, slurry composition, resin composition, and method for producing spherical silica particles
Yusuke Watanabe, Miyoshi (JP)
Assigned to ADMATECHS CO., LTD., Miyoshi (JP)
Filed by ADMATECHS CO., LTD., Miyoshi (JP)
Filed on Feb. 27, 2025, as Appl. No. 19/065,235.
Application 19/065,235 is a continuation of application No. PCT/JP2022/032670, filed on Aug. 30, 2022.
Prior Publication US 2025/0197227 A1, Jun. 19, 2025
This patent is subject to a terminal disclaimer.
Int. Cl. C08K 7/18 (2006.01); C01B 33/18 (2006.01); C09C 1/30 (2006.01)
CPC C01B 33/18 (2013.01) [C08K 7/18 (2013.01); C09C 1/3063 (2013.01); C01P 2004/03 (2013.01); C01P 2004/04 (2013.01); C01P 2004/32 (2013.01); C01P 2004/61 (2013.01); C01P 2004/62 (2013.01); C01P 2006/10 (2013.01); C01P 2006/14 (2013.01); C01P 2006/80 (2013.01); C08K 2201/005 (2013.01)] 12 Claims
 
1. Spherical silica particles comprising silica as a main component, wherein
the spherical silica particles have
an average particle diameter of 0.1 to 10.0 μm,
a true specific gravity of 0.9 to 1.9 g/cm3, the true specific gravity being measured with nitrogen gas,
a pore volume of 0.1 mL/g or lower,
an Na content of 10 ppm or lower, and
a true specific gravity retention rate of 80% or higher, the true specific gravity retention rate being measured with nitrogen gas and being a rate between before and after pressurization is performed at 300 MPa for 1 minute, and
the spherical silica particles include, in an existence proportion of 60% or lower, particles in each of which a maximum value among major axes of internal voids is not smaller than half a major axis of the particle.