Inorganic oxide particle, inorganic oxide particle dispersion and preparation method thereof, and method for producing surface modifier

Patent metadata

Field	Value
Publication number	US-2025059051-A1
Application number	US-202418932296-A
Country	US
Kind code	A1
Filing date	Oct 30, 2024
Priority date	Feb 25, 2019
Publication date	Feb 20, 2025
Grant date	—

Abstract

Provided is an inorganic oxide dispersion (sol) in which inorganic oxide particles are dispersed in silicone oil.

First claim

1 . A dispersion comprising:
a silicone oil; and inorganic oxide particles dispersed in the silicone oil, wherein the inorganic oxide particles are surface-modified with a surface modifier represented by following general formula (1):

wherein
R 1 represents a methyl group or an ethyl group,
R 2 represents an alkyl group having 1 to 10 carbon atoms, an aryl group having 6 to 40 carbon atoms, or a combination thereof,
R 3 is a linking group comprising a chemical group produced by a reaction between a B group and a C group,
the B group is an epoxy group, a vinyl group, a hydroxyl group, or an isocyanate group,
the C group is a carboxyl group, an acid anhydride group, an amino group, a thiol group, a hydroxyl group, or an isocyanate group,
R 4 represents an alkyl group having 1 to 10 carbon atoms and optionally comprising an epoxy group, a vinyl group, a hydroxyl group, an isocyanate group, a carboxyl group, an acid anhydride group, an amino group, or a thiol group, an aryl group having 6 to 40 carbon atoms, or an OH group, and modifies a silanol group on a surface of silica particles with an OH group obtained by hydrolysis of an OR 1 group,
a unit structure A includes a unit structure of following general formula (1-1) and a unit structure of following general formula (1-2), and the number of unit structures of the general formula (1-1) and the number of unit structures of the general formula (1-2) included in the unit structure A are n4 and n5, respectively:

wherein R 5 represents an alkyl group having 1 to 10 carbon atoms and optionally comprising an epoxy group, a vinyl group, a hydroxyl group, an isocyanate group, a carboxyl group, an acid anhydride group, an amino group, or a thiol group, an aryl group having 6 to 40 carbon atoms, an OH group, or a hydrogen atom, and
n1 is an integer of 1 to 3, n2 is an integer of 0 to 1, n1+n2=3, n3=n4+n5, n3 is an integer of 1 to 100, 0≤n4≤100, and 1≤n5≤100, and
the inorganic oxide particles further have a trimethylsilyl group at 0.3 to 20 groups/nm 2 on a surface thereof.

2 . The dispersion according to claim 1 , wherein the inorganic oxide particles have an average primary particle size of 5 to 100 nm.

3 . The dispersion according to claim 1 , wherein the inorganic oxide particles are selected from the group consisting of silica particles, zirconia particles, titania particles, and tin oxide particles.

4 . The dispersion according to claim 1 , wherein the B group is an epoxy group, and the C group is an amino group.

5 . The dispersion according to claim 1 , wherein R 4 and/or R 5 is selected from the group consisting of an alkyl group having 1 to 10 carbon atoms, an aryl group having 6 to 40 carbon atoms, and an OH group.

6 . The dispersion according to claim 1 , wherein the inorganic oxide particles are silica particles surface-modified with a surface modifier represented by a general formula (a) or the general formula (1) at 0.1 to 10 groups/nm 2 .

7 . The dispersion according to claim 1 , wherein the silicone oil is a dimethyl silicone oil, a methyl phenyl silicone oil, or a methyl hydrogen silicone oil having a viscosity of 100 centistokes to 5,000 centistokes.

8 . A method for producing the dispersion according to claim 1 , the method comprising:
a step (i): mixing an inorganic oxide sol dispersed in a mixed solvent of a hydrocarbon and an alcohol with an alcohol solution of a surface modifier represented by a general formula (1) in a hydrocarbon solvent at a weight ratio of inorganic oxide: surface modifier represented by the general formula (1) of 1:0.1 to 10; a step (ii): performing a reaction at 60° C. to 150° C. for 0.1 to 60 hours; a step (iii): removing an alcohol solvent to obtain a surface-modified inorganic oxide sol dispersed in the hydrocarbon solvent; and a step (iv): mixing the surface-modified inorganic oxide sol dispersed in the hydrocarbon solvent with a silicone oil to remove a hydrocarbon.

Assignees

• Nissan Chemical Corp

Inventors

• Suemura Naohiko
• Maeta Tomoya

Classifications

• C08L83/04

  Polysiloxanes · CPC title

• B82Y40/00

  Manufacture or treatment of nanostructures · CPC title

• B82Y30/00

  Nanotechnology for materials or surface science, e.g. nanocomposites · CPC title

• C08K9/06

  with silicon-containing compounds · CPC title

• C08G77/48

  in which at least two but not all the silicon atoms are connected by linkages other than oxygen atoms (C08G77/42 takes precedence) · CPC title