SILICA PARTICLES

• US 20200131044A1
• Filed: 04/05/2018
• Published: 04/30/2020
• Est. Priority Date: 04/06/2017
• Status: Active Grant

• Current Assignee: Nippon Shokubai Company Limited
• Original Assignee: Nippon Shokubai Company Limited
• Inventors: NISHIMURA, Masaki, ONO, Yuji, SHIBAZAKI, Shoichi
• Granted Patent: US 11,214,492 B2
• Time in Patent Office: Days
• CPC Class Codes: C01B 33/18 Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof preparation of aerogels by dehydrating gels C01B33/158; treatment to enhance the pigmenting or filling properties C09C
• CPC Class Codes: C01B 33/187 by acidic treatment of silicates
• CPC Class Codes: C01P 2004/04 obtained by TEM, STEM, STM or AFM
• CPC Class Codes: C01P 2004/32 Spheres
• CPC Class Codes: C01P 2004/52 highly monodisperse size distribution
• CPC Class Codes: C01P 2004/64 Nanometer sized, i.e. from 1-100 nanometer
• CPC Class Codes: C01P 2006/12 Surface area
• CPC Class Codes: C01P 2006/22 Rheological behaviour as dispersion, e.g. viscosity, sedimentation stability
• CPC Class Codes: C01P 2006/60 Optical properties, e.g. expressed in CIELAB-values
• CPC Class Codes: C01P 2006/80 Compositional purity
• CPC Class Codes: C08F 222/10 Esters
• CPC Class Codes: C08F 292/00 Macromolecular compounds obtained by polymerising monomers on to inorganic materials
• CPC Class Codes: C08K 2201/005 Additives being defined by their particle size in general
• CPC Class Codes: C08K 2201/006 Additives being defined by their surface area
• CPC Class Codes: C08K 2201/011 Nanostructured additives
• CPC Class Codes: C08K 3/36 Silica
• CPC Class Codes: C08K 9/04 Ingredients treated with organic substances treated with macromolecular compounds C08K9/08
• CPC Class Codes: C08L 101/00 Compositions of unspecified macromolecular compounds
• CPC Class Codes: C08L 67/02 Polyesters derived from dicarboxylic acids and dihydroxy compounds C08L67/06 takes precedence
• CPC Class Codes: C08L 77/00 Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain of polyhydrazides C08L79/06; of polyamideimides or polyamide acids C08L79/08; Compositions of derivatives of such polymers
• CPC Class Codes: C08L 79/08 : Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
• CPC Class Codes: C09C 1/3054 : Coating
• CPC Class Codes: C09C 1/3063 : Treatment with low-molecular organic compounds
• CPC Class Codes: C09C 1/3081 : Treatment with organo-silicon compounds

Abstract

The object of the present invention is to provide silica particles which can provide a silica particle dispersion exhibiting excellent uniformity. The present invention is silica particles having an average primary particle diameter d_BET calculated from a specific surface area by a BET method of 1 nm or more and 100 nm or less and a ratio (d_DLS/d_BET) of an average secondary particle diameter d_DLS measured by a dynamic light scattering method to the d_BET of 1.2 or less. The silica particles of the present invention preferably have a coefficient of variation in a particle diameter measured using a transmission electron microscope at a magnification of 200,000 of 20% or less.

Claims

1. Silica particles having a d_BET calculated from a specific surface area by a BET method of 1 nm or more and 100 nm or less and a ratio (d_DLS/d_BET) of a d_DLS measured by a dynamic light scattering method to the d_BET of 1.2 or less.

2. The silica particles according to claim 1, wherein a coefficient of variation in a particle diameter measured using a transmission electron microscope at a magnification of 200,000 is 20% or less.

3. The silica particles according to claim 1 or 2, wherein the silica particles are subjected to a surface treatment using a surface treatment agent.

4. The silica particles according to claim 3, wherein the surface treatment agent is a surface treatment agent having a (meth)acryloyl group.

6. A silica particle dispersion comprising the silica particles according to claim 1, and a solvent.

7. The silica particle dispersion according to claim 6, comprising a dispersant.

8. The silica particle dispersion according to claim 7, wherein a molecular structure of the dispersant has an amine structure.

9. A silica particle-containing resin composition comprising the silica particles according to claim 1 and a polymerizable monomer and/or a polymer material.

5. A process for producing silica particles, comprising hydrolyzing an alkoxysilane in presence of water, a basic catalyst, and an aromatic heterocyclic compound having a nitrogen atom.