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Silica-titania composite oxide powder

A composite oxide, titanium dioxide technology, applied in the direction of silicon dioxide, silicon oxide, etc., can solve the problems of scratches, voids and poor adhesion, hinder uniform flow, etc., to improve the function and inhibit the generation of coarse particles.

Active Publication Date: 2021-10-26
TOKUYAMA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when producing optical films, if the inorganic filler contains coarse particles or agglomerates, it may cause defects or scratches, etc.
In addition, when the organic-inorganic composite material is used in applications such as semiconductor underfill, it is necessary to allow the organic-inorganic composite material to flow through narrow channels, but if the organic-inorganic composite material contains coarse particles or agglomerates, it will Prevents it from flowing evenly in narrow channels, thus being the cause of voids and poor adhesion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0177] In a 200ml three-necked glass flask, 54.6g of tetramethoxysilane (manufactured by Tama Chemical Industry Co., Ltd., methyl orthosilicate, hereinafter referred to as TMOS) was added as a metal alkoxide, 5.5g of methanol was added as an organic solvent, and 2.2 g of 0.035% by mass hydrochloric acid was added as an acid catalyst, followed by stirring with a stirrer at room temperature for 10 minutes to hydrolyze TMOS.

[0178] After that, 8.9 g of titanium tetraisopropoxide (manufactured by Nippon Soda Co., Ltd., A-1 (hereinafter referred to as TPT)) was added as a metal alkoxide in a 30 ml glass container, and 8.9 g was added while stirring with a stirrer. g of isopropyl alcohol (hereinafter referred to as IPA).

[0179] The TPT diluent was added to the TMOS hydrolyzate being stirred with a stirrer to obtain 80.1 g of a transparent complex alkoxide solution.

[0180] The titanium dioxide content calculated from the amount of alkoxide used was 8.0 mol%.

[0181] A stirre...

Embodiment 2

[0193] Silica-titania composite oxide particles were obtained in the same manner as in Example 1 except that, in Example 1, the supply of the raw material was completed within 2.4 hours. The nitrogen content of the dry powder was 1.73%.

[0194] The silica-titania composite oxide powder obtained by sintering was measured using a laser particle size distribution analyzer, and the measured average particle diameter was 0.35 μm. As a result of coarse particle measurement, particles with a particle diameter of 5 μm or more were 84 ppm. The particles have an average refractive index of 1.504. The minimum absorbance S is 0.0148, which is far smaller than the value calculated from the average particle diameter of 0.35 μm (0.026-0.008×D=0.0232).

[0195]

[0196] Silica-titania composite oxide particles were obtained in the same manner as in Example 2, except that, in Example 2, the reaction liquid was centrifuged and directly dried. The nitrogen content of the dry powder was 2.3...

Embodiment 3

[0199]Silica-titania composite oxide particles were obtained in the same manner as in Example 1, except that in Example 2, the obtained dry powder was sintered at a sintering temperature of 1000°C.

[0200] The silica-titania composite oxide powder obtained by sintering was measured using a laser particle size distribution analyzer, and the measured average particle diameter was 0.34 μm. As a result of coarse particle measurement, particles with a particle diameter of 5 μm or more were 284 ppm. The particles have an average refractive index of 1.504. The minimum absorbance S is 0.0139, which is far smaller than the value calculated from the average particle diameter of 0.34 μm (0.026-0.008×D=0.0233).

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Abstract

This silica-titania composite oxide powder has an average particle diameter D ([mu]m) of 0.1-3.0 [mu]m inclusive, and an average refractive index at a measurement wavelength of 589 nm of 1.47 or higher, the silica-titania composite oxide powder being such that the minimum absorbance S obtained by dispersing 30 mass% of silica-titania composite oxide particles in a liquid having the same refractive index as the average refractive index and conducting measurement satisfies the relationship: S < 0.026 - 0.008 * D.

Description

technical field [0001] The present invention relates to a silica-titania composite oxide powder, which is very suitable as a filler for high transparency resin or transparent resin adhesive, an anti-blocking agent for films, and a hard coat material. The distribution is controlled and coarse particles above 5 μm are reduced. Background technique [0002] Thermoplastic resins such as PET, polycarbonate, PMMA and polystyrene have good transparency, mechanical properties, formability, etc., so they are widely used in industry. As a method of improving various physical properties of organic polymers, composite materials (hereinafter referred to as "organic-inorganic composite materials") composed of organic compounds and inorganic compounds have been studied. In addition to the characteristics of organic polymers such as flexibility, low density and formability, they also have the characteristics of inorganic compounds such as high strength, high modulus of elasticity and heat ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12C01B33/18
CPCC01B33/18C01P2004/60C01P2006/90C08K3/22C08K3/36C08K2003/2241C01B33/12C04B35/14C04B35/46C04B2235/5436
Inventor 石津贤一
Owner TOKUYAMA CORP