US 12,304,822 B2
Inorganic particle composite, method for producing the same, and inorganic particle composite dispersion
Yoshihiko Arao, Tokyo (JP); and Masatoshi Kubouchi, Tokyo (JP)
Assigned to TOKYO INSTITUTE OF TECHNOLOGY, Tokyo (JP); and KYOCERA Corporation, Kyoto (JP)
Appl. No. 16/755,137
Filed by TOKYO INSTITUTE OF TECHNOLOGY, Tokyo (JP); and KYOCERA Corporation, Kyoto (JP)
PCT Filed Oct. 12, 2018, PCT No. PCT/JP2018/038171
§ 371(c)(1), (2) Date Apr. 9, 2020,
PCT Pub. No. WO2019/074109, PCT Pub. Date Apr. 18, 2019.
Claims priority of application No. 2017-198450 (JP), filed on Oct. 12, 2017; and application No. 2018-033385 (JP), filed on Feb. 27, 2018.
Prior Publication US 2020/0331761 A1, Oct. 22, 2020
Int. Cl. C01B 32/225 (2017.01); C01B 21/064 (2006.01); C01B 32/174 (2017.01); C01B 32/194 (2017.01); C01G 39/06 (2006.01)
CPC C01B 32/225 (2017.08) [C01B 21/0648 (2013.01); C01B 32/174 (2017.08); C01B 32/194 (2017.08); C01G 39/06 (2013.01); C01P 2004/04 (2013.01); C01P 2004/61 (2013.01); C01P 2004/64 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A method for producing an inorganic particle composite comprising:
(A) adding water-soluble salt to an inorganic powder and mixing the water-soluble salt and the inorganic powder in a dry or paste form;
(B) generating free radicals on a surface of the inorganic powder by mixing the water-soluble salt with the inorganic powder to form a mixture;
(C) reacting the free radicals generated on the surface of the inorganic powder with the counter-anion of the water-soluble salt; and
(D) washing the mixture with water after (C) to obtain an inorganic particle composite including the component derived from the water-soluble salt, wherein:
the water-soluble salt is a weak acid salt that has an acid dissociation constant pKa (H2O) of an acid of a counter anion of the water-soluble salt greater than 0,
the inorganic powder is at least one of a layered mineral powder, an sp2 type carbon material, a metal powder, a ceramic, and oxide powder of a layered mineral powder, an sp2 type carbon material, a metal powder, or a ceramic,
the free radicals are mutually bonded to the counter anion of the water-soluble salt,
the anion derived from the water-soluble salt is bonded to the inorganic powder and the inorganic powder is negatively charged, and the cation derived from the water-soluble salt is attracted around the anion of the negatively charged inorganic powder forming an electric double layer of the cations and the anions,
the counter-anion derived from the water-soluble salt in the inorganic particle composite is the cation of the water-soluble salt bonded to the inorganic powder by the weak acid releasing reaction between the free radicals generated on the surface of the inorganic powder and the weak acid, and
the concentration of the cation component of the water soluble salt is 35 to 10,000 ppm.