US 12,319,805 B2
Hollow particles
Hisashi Kurokawa, Tokyo (JP)
Assigned to ZEON CORPORATION, Tokyo (JP)
Appl. No. 18/035,438
Filed by ZEON CORPORATION, Tokyo (JP)
PCT Filed Nov. 11, 2021, PCT No. PCT/JP2021/041476
§ 371(c)(1), (2) Date May 4, 2023,
PCT Pub. No. WO2022/107674, PCT Pub. Date May 27, 2022.
Claims priority of application No. 2020-193207 (JP), filed on Nov. 20, 2020.
Prior Publication US 2023/0407039 A1, Dec. 21, 2023
Int. Cl. C08J 9/28 (2006.01); B01J 13/16 (2006.01); B01J 13/20 (2006.01); C08F 20/20 (2006.01)
CPC C08J 9/286 (2013.01) [B01J 13/16 (2013.01); B01J 13/206 (2013.01); C08F 20/20 (2013.01); C08J 2201/0502 (2013.01); C08J 2335/02 (2013.01)] 9 Claims
OG exemplary drawing
 
1. Hollow particles which comprise a shell containing a resin and a hollow portion surrounded by the shell,
wherein the shell contains, as the resin, a polymer in which from 70 parts by mass to 100 parts by mass of a crosslinkable monomer unit is contained in 100 parts by mass of all monomer units;
wherein the crosslinkable monomer unit contains a monomer unit derived from a bifunctional crosslinkable monomer and a monomer unit derived from a trifunctional or higher-functional crosslinkable monomer;
wherein a content of the monomer unit derived from the bifunctional crosslinkable monomer is 50 parts by mass or more and 90 parts by mass or less, and a content of the monomer unit derived from the trifunctional or higher-functional crosslinkable monomer is 5 parts by mass or more and 40 parts by mass or less, in 100 parts by mass of all monomer units of the polymer;
wherein a void ratio is 60% or more;
wherein a content of a surfactant present on a surface of the hollow particles is 200 ppm or less;
wherein a content of a metal measured by ICP optical emission spectroscopy is 1 ppm or more and 100 ppm or less; and wherein a volume average particle diameter of the hollow particles is from 1 μm to 10 μm
wherein a relative permittivity at a frequency of 1 MHz is 1.6 or less.