US 12,358,799 B2
Metal oxide particles surface modified with quaternary ammonium group, and method for producing same
Tomoko Shimizu, Fukuchiyama (JP)
Assigned to FUSO CHEMICAL CO., LTD., Osaka (JP)
Appl. No. 17/294,470
Filed by FUSO CHEMICAL CO., LTD., Osaka (JP)
PCT Filed Nov. 28, 2019, PCT No. PCT/JP2019/046550
§ 371(c)(1), (2) Date May 17, 2021,
PCT Pub. No. WO2020/116307, PCT Pub. Date Jun. 11, 2020.
Claims priority of application No. 2018-227155 (JP), filed on Dec. 4, 2018.
Prior Publication US 2022/0009784 A1, Jan. 13, 2022
Int. Cl. C01B 33/12 (2006.01); B82Y 30/00 (2011.01); B82Y 40/00 (2011.01)
CPC C01B 33/126 (2013.01) [B82Y 30/00 (2013.01); B82Y 40/00 (2013.01); C01P 2004/03 (2013.01); C01P 2004/64 (2013.01)] 16 Claims
 
1. A metal oxide particle having a surface modified with a silyl group and having an aggregation ratio (average particle size measured by dynamic light scattering/average diameter of primary particles measured in an SEM image) of 5.0 or less,
an isoelectric point of a colloidal aqueous dispersion of the metal oxide particles being at least pH 10.8, the colloidal aqueous dispersion having a solids concentration of the metal oxide particles of 2 wt %,
the silyl group being at least one group selected from the group consisting of a silyl group represented by general formula (1):
—Si(X)n-[L-CR1(OH)—C(R2)2-A]3-n  (1),
wherein
X is the same or different, and each represents a hydroxy group, a hydrolyzable substituent, a non-hydrolyzable substituent, a bond with Si of another silyl group via —O—, or a bond with a metal atom on the particle surface via —O—;
n is 0, 1, or 2;
L is a linkage group;
R1 is a hydrogen atom, or an alkyl group that may contain an amino group, a hydroxy group, or an unsaturated bond;
R2 is the same or different, and each represents a hydrogen atom, or an alkyl group that may contain an amino group, a hydroxy group, or an unsaturated bond; and
A is a quaternary ammonium group, and
a silyl group represented by general formula (2):

OG Complex Work Unit Chemistry
wherein
X′ is the same or different, and each represents a hydroxy group, a hydrolyzable substituent, a non-hydrolyzable substituent, a bond with Si of another silyl group via —O—, or a bond with a metal atom on the particle surface via —O—;
n′ is 0, 1, or 2;
L′ is a linkage group; and
A′ is a quaternary ammonium group.