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Fine particle dispersion liquid containing tantalum oxide fine particles, tantalum oxide fine particle-resin composite, and method of producing fine particle dispersion liquid

Inactive Publication Date: 2011-05-05
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013]According to the method of producing a fine particle dispersion liquid containing tantalum oxide fine particles of the present invention, when the dispersion treatment is performed in the organic solvent containing the tantalum oxide fine particles, the basic compound, and the surface modifier, the crystallite size of each of the tantalum oxide fine particles reduces as compared with that before the dispersion treatment. Further, the fine particle dispersion liquid containing the tantalum oxide fine particles where the tantalum oxide fine particles are uniformly dispersed in the organic solvent is obtained.
[0014]The fine particle dispersion liquid containing tantalum oxide fine particles of the present invention can be easily compatible with a resin because both the crystallite size and volume-average particle diameter of each of the tantalum oxide fine particles are small enough for the tantalum oxide fine particles to be uniformly dispersed in the organic solvent. In addition, a tantalum oxide fine particle-resin composite produced by using the tantalum oxide fine particles or fine particle dispersion liquid containing tantalum oxide fine particles of the present invention has high transparency.
[0015]In addition, the use of the organic solvent of the fine particle dispersion liquid containing tantalum oxide fine particles of the present invention with one or both of a thermosetting monomer and a photocurable monomer allows one to integrate the method of producing a fine particle dispersion liquid containing tantalum oxide fine particles and the method of producing a tantalum oxide fine particle-resin composite of the present invention into a single method. Accordingly, the present invention can provide not only a tantalum oxide fine particle-resin composite having high transparency but also a simple method of producing the composite.

Problems solved by technology

However, the metal oxide fine particles are apt to agglomerate as their particle diameters become smaller, and hence it has been difficult to disperse the metal oxide fine particles having small particle diameters in the resin uniformly and stably.
However, it has been difficult to obtain tantalum oxide particles each having high dispersibility in a solvent or a resin and a small crystallite size at an inexpensive price.

Method used

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Examples

Experimental program
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Effect test

example 1

Method of Measuring Crystallite Size of Tantalum Oxide Fine Particle

[0076]The crystallite size of each of tantalum oxide fine particles of this example is a value D(110) calculated from the X-ray diffraction peak of the (110) surface of the tantalum oxide fine particle obtained with an XRD (RINT2100 manufactured by Rigaku Corporation) by using Debye-Scherrer's equation (Eq. 1) described below:

D(110)=K*λ / β cos θ  (Eq. 1)

[0077]where D(110) represents a crystallite size (crystallite size), K=0.9, λCu−Kα1=0.154056 nm, and represents the half width of the diffraction peak.

[0078](Method of Measuring Volume-Average Particle Diameter of Tantalum Oxide Fine Particle)

[0079]The volume-average particle diameter of each of the tantalum oxide fine particles of this example was measured with a dynamic light scattering particle diameter distribution-measuring apparatus (ZETASIZER Nano-S manufactured by Malvern Instruments Ltd.).

[0080](Method of Measuring Haze Ratio of Fine Particle Dispersion Liqui...

example 2

[0088]The same operations as those of Example 1 were performed except that the amount of triethylamine was changed to 0.3 part by weight. Tantalum oxide in the resultant fine particle dispersion liquid containing the tantalum oxide fine particles had a crystallite size of 5 nm and a volume-average particle diameter of 13 nm, and hence the crystallite size of tantalum oxide after the dispersion became smaller than the crystallite size of the raw material. In addition, the dispersion liquid had a haze ratio of 7%, and hence its transparency was high.

example 3

[0089]The same operations as those of Example 1 were performed except that the amount of triethylamine was changed to 1.2 parts by weight. Tantalum oxide in the resultant fine particle dispersion liquid containing the tantalum oxide fine particles had a crystallite size of 4 nm and a volume-average particle diameter of 13 nm, and hence the crystallite size of tantalum oxide after the dispersion became smaller than the crystallite size of the raw material. In addition, the dispersion liquid had a haze ratio of 7%, and hence its transparency was high.

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Abstract

Provided are fine particle dispersion liquid containing tantalum oxide fine particles each having a small crystallite size and uniformly dispersed in an organic solvent, a tantalum oxide fine particle-resin composite, and a method of producing the dispersion liquid. The method of producing a fine particle dispersion liquid containing tantalum oxide fine particles includes: preparing a mixture of the tantalum oxide fine particles, a basic compound, a surface modifier, and an organic solvent; and subjecting the mixture to a dispersion treatment.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a fine particle dispersion liquid containing tantalum oxide fine particles, a tantalum oxide fine particle-resin composite, and a method of producing a fine particle dispersion liquid.[0003]2. Description of the Related Art[0004]In recent years, researches on the formation of a colorless, transparent, high-refractive index resin have been vigorously conducted with a view to increasing the refractive index of a resin. The formation involves introducing fine particles of a metal oxide having a high refractive index such as titanium oxide, zirconium oxide, zinc oxide, tantalum oxide, or niobium oxide, or a composite oxide of two or more of such metal oxides into the resin while maintaining a dispersed state.[0005]The high-refractive index, transparent resin has been expected to find applications in various optical materials because the resin is a material bringing together the characteristi...

Claims

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Application Information

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IPC IPC(8): C08K3/22
CPCC08K9/04C08K9/08Y10T428/2991Y10T428/2995
Inventor OKADA, SEIJI
Owner CANON KK
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