US 11,939,222 B2
Nanodiamond particle dispersion
Kouichi Umemoto, Tokyo (JP); and Hidekazu Takeuchi, Tokyo (JP)
Assigned to DAICEL CORPORATION, Osaka (JP)
Appl. No. 16/965,418
Filed by DAICEL CORPORATION, Osaka (JP)
PCT Filed Jan. 15, 2019, PCT No. PCT/JP2019/000969
§ 371(c)(1), (2) Date Jul. 28, 2020,
PCT Pub. No. WO2019/146453, PCT Pub. Date Aug. 1, 2019.
Claims priority of application No. 2018-012137 (JP), filed on Jan. 29, 2018.
Prior Publication US 2021/0114882 A1, Apr. 22, 2021
Int. Cl. C01B 32/28 (2017.01); B82Y 30/00 (2011.01); B82Y 40/00 (2011.01); C09C 1/44 (2006.01); C09C 3/12 (2006.01)
CPC C01B 32/28 (2017.08) [C09C 1/44 (2013.01); C09C 3/12 (2013.01); B82Y 30/00 (2013.01); B82Y 40/00 (2013.01); C01P 2004/64 (2013.01)] 13 Claims
 
1. A nanodiamond particle dispersion comprising nanodiamond particles dispersed in an organic solvent,
wherein the nanodiamond particles have a structure including the surface modified by a group represented by Formula (1):

OG Complex Work Unit Chemistry
where, in Formula (1), R4 denotes an aliphatic hydrocarbon group having from 1 to 8 carbon atoms, R1′ denotes a group represented by Formula (a), R2′ denotes a hydrogen atom, an aliphatic hydrocarbon group having from 1 to 3 carbon atoms, or a group represented by Formula (a), and the atomic bond indicated by the wavy line in the Formula bonds to the surface of the nanodiamond particles:

OG Complex Work Unit Chemistry
where, in Formula (a), R4 is the same as above, R3 and R5 may be the same or different, and each denotes a hydrogen atom or an aliphatic hydrocarbon group having from 1 to 3 carbon atoms, m represents an integer of 0 or greater, n represents an integer greater than 0, an atomic bond extending leftward from a silicon atom bonds to an oxygen atom, and an atomic bond indicated by a wavy line bonds to the surface of the nanodiamond particles,
the organic solvent has an SP value from 8.0 to 14.0 (cal/cm3)1/2, and
the nanodiamond particles are dispersed with a particle diameter (D50) from 2 to 100 nm.