Silica particle liquid dispersion and production method therefor

Patent metadata

Field	Value
Publication number	US-11254580-B2
Application number	US-201816478600-A
Country	US
Kind code	B2
Filing date	Jan 18, 2018
Priority date	Jan 20, 2017
Publication date	Feb 22, 2022
Grant date	Feb 22, 2022

Abstract

A method for producing a liquid dispersion containing irregular-shaped silica particles in which two or more primary particles are linked together, by simultaneously adding a liquid A containing silane alkoxide and a liquid B containing an alkali catalyst and water to a liquid I consisting substantially of an organic solvent to cause hydrolysis and polycondensation of the silane alkoxide, wherein the period from the start of the addition until the silica concentration of the reaction system at the end of the addition reaches 70% is 20% or less of the full reaction time period.

First claim

The invention claimed is:

1. A method for producing a dispersion liquid of silica particles, comprising:
providing a liquid I consisting substantially of an organic solvent; and
simultaneously adding a liquid A containing silane alkoxide and a liquid B containing an alkali catalyst and water to the liquid I to cause hydrolysis and polycondensation of the silane alkoxide, so as to produce a liquid dispersion containing an irregular-shaped silica particle in which two or more primary particles are linked to each other;
wherein a period from a start of an addition until a silica concentration reaches 70% of a silica concentration in a reaction system at an end of the addition is 20% or less of a total addition period.

2. The method for producing a dispersion liquid of silica particles according to claim 1 , wherein an amount of the liquid I is 30% by mass or less relative to a total addition amount of the liquid A and the liquid B.

3. The method for producing a dispersion liquid of silica particles according to claim 1 , wherein
a variation rate of a mole ratio of the alkali catalyst to the silane alkoxide in the reaction system during the period from the start to the end of the addition relative to an initial mole ratio of the alkali catalyst to the silane alkoxide is 0.90 to 1.10; and
the variation rate of the mole ratio of the water to the silane alkoxide in the reaction system relative to the initial mole ratio of the water to the silane alkoxide is 0.90 to 1.10.

4. The method for producing a dispersion liquid of silica particles according to claim 1 , wherein
the mole ratio of the alkali catalyst to the silane alkoxide in the reaction system during the period from the start to the end of the addition is constantly 0.20 or more; and
the mole ratio of the water to the silane alkoxide is constantly 2.0 or more.

5. The method for producing a dispersion liquid of silica particles according to claim 1 , wherein a temperature of the reaction system is 0 to 65° C.

6. The method for producing a dispersion liquid of silica particles according to claim 1 , wherein the silica concentration in the reaction system at the end of the addition is 5% by mass or more.

7. The method for producing a dispersion liquid of silica particles according to claim 2 , wherein
a variation rate of a mole ratio of the alkali catalyst to the silane alkoxide in the reaction system during the period from the start to the end of the addition relative to an initial mole ratio of the alkali catalyst to the silane alkoxide is 0.90 to 1.10; and
the variation rate of the mole ratio of the water to the silane alkoxide in the reaction system relative to the initial mole ratio of the water to the silane alkoxide is 0.90 to 1.10.

8. The method for producing a dispersion liquid of silica particles according to claim 2 , wherein
the mole ratio of the alkali catalyst to the silane alkoxide in the reaction system during the period from the start to the end of the addition is constantly 0.20 or more; and
the mole ratio of the water to the silane alkoxide is constantly 2.0 or more.

9. The method for producing a dispersion liquid of silica particles according to claim 3 , wherein
the mole ratio of the alkali catalyst to the silane alkoxide in the reaction system during the period from the start to the end of the addition is constantly 0.20 or more; and
the mole ratio of the water to the silane alkoxide is constantly 2.0 or more.

10. The method for producing a dispersion liquid of silica particles according to claim 7 , wherein
the mole ratio of the alkali catalyst to the silane alkoxide in the reaction system during the period from the start to the end of the addition is constantly 0.20 or more; and
the mole ratio of the water to the silane alkoxide is constantly 2.0 or more.

11. The method for producing a dispersion liquid of silica particles according to claim 2 , wherein a temperature of the reaction system is 0 to 65° C.

12. The method for producing a dispersion liquid of silica particles according to claim 3 , wherein a temperature of the reaction system is 0 to 65° C.

13. The method for producing a dispersion liquid of silica particles according to claim 4 , wherein a temperature of the reaction system is 0 to 65° C.

14. The method for producing a dispersion liquid of silica particles according to claim 2 , wherein the silica concentration in the reaction system at the end of the addition is 5% by mass or more.

15. The method for producing a dispersion liquid of silica particles according to claim 3 , wherein the silica concentration in the reaction system at the end of the addition is 5% by mass or more.

16. The method for producing a dispersion liquid of silica particles according to claim 4 , wherein the silica concentration in the reaction system at the end of the addition is 5% by mass or more.

17. The method for producing a dispersion liquid of silica particles according to claim 5 , wherein the silica concentration in the reaction system at the end of the addition is 5% by mass or more.

Assignees

• Jgc Catalysts & Chemicals Ltd

Inventors

• Egami Miki
• Kumazawa Mitsuaki
• Arakane Hirotada
• Muraguchi Ryo
• Hirai Toshiharu

Classifications

• H10P52/00

  Grinding, lapping or polishing of wafers, substrates or parts of devices · CPC title

• C01P2004/60

  Particles characterised by their size · CPC title

• C09G1/02

  containing abrasives or grinding agents {(abrasives as such C09K3/14; polishing of semi-conductors H10P52/40)} · CPC title

• C01B33/145 Primary

  Preparation of hydroorganosols, organosols or dispersions in an organic medium · CPC title

• C01B33/141 Primary

  Preparation of hydrosols or aqueous dispersions · CPC title