	US 12,330,947 B2
	Method for producing surface-modified nanodiamond
Hidekazu Takeuchi, Tokyo (JP); Naoyoshi Matsuno, Tokyo (JP); and Hideo Yagasaki, Tokyo (JP)
Assigned to DAICEL CORPORATION, Osaka (JP)
Appl. No. 17/634,699
Filed by DAICEL CORPORATION, Osaka (JP)
PCT Filed Aug. 19, 2020, PCT No. PCT/JP2020/031222 § 371(c)(1), (2) Date Feb. 11, 2022, PCT Pub. No. WO2021/039521, PCT Pub. Date Mar. 4, 2021.
Claims priority of application No. 2019-158008 (JP), filed on Aug. 30, 2019.
Prior Publication US 2022/0324712 A1, Oct. 13, 2022
Int. Cl. C01B 32/28 (2017.01); B82Y 40/00 (2011.01); C01B 32/26 (2017.01)

CPC C01B 32/28 (2017.08) [C01B 32/26 (2017.08); B82Y 40/00 (2013.01)]

20 Claims

1. A method for producing a surface-modified nanodiamond, the method comprising subjecting a nanodiamond or a surface-modified nanodiamond to ring-opening addition polymerization with glycidol in an aliphatic alcohol solvent having from 2 to 4 carbon atoms, the surface-modified nanodiamond having its surface modified with a group represented by Formula (1):

—X¹—H (1)

wherein in Formula (1), X¹represents —NH—, —O—, —COO—, —PH(═O)O—, —S—, —SO₃—, —SO₂—, or —SiO—,

to obtain a surface-modified nanodiamond having its surface modified with a group containing a polyglycerin chain represented by Formula (2):

—X—R (2)

wherein in Formula (2), X represents a single bond, —NH—, —O—, —COO—, —PH(═O))—, —S—, —SO₃—, —SO₂—, or —SiO—, and R represents a polyglyceryl group.