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Dispersed ingredient having metal-oxygen

a technology of dispersed ingredients and metaloxygen, which is applied in the direction of natural mineral layered products, instruments, optical elements, etc., can solve the problems of affecting the polymerization reaction effect of remaining substances

Inactive Publication Date: 2004-10-07
NIPPON SODA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0036] The dispersed ingredient of the present invention is characterized by stable dispersion without aggregating in an organic solvent in the absence of an acid, a base and / or a dispersion stabilizer.
[0130] An optical material of the present invention can be coated over the surface of a lens, glass or the like, without carrying out casting polymerization, and hardened by an operation such as light irradiation, if required. In this way the material can also be used as a starting material to make a hard coat film to protect the surface and for a multi-layered reflection preventive film to prevent reflection. Any coating method, including dip coating, spin coating, flow coating, roller coating and brush coating, can be adopted.

Problems solved by technology

It is difficult to completely remove the used water, acid or base.
Therefore, a problem was the effect of these remaining substances on the polymerization reaction.
Therefore, a problem was that these inhibit the polymerization or give bad effects on the physical properties of the product.
However, many organic substances that are hard to decompose due to their high boiling points coexist in the sol or gel film.
In other words, the removal of the organic substances from the gel film creates many pores in the film, being a cause of defects of the obtained thin metal oxide film.
There was a problem that various characteristics of the metal oxide, such as mechanical, optical and electric, were not fully displayed.
On the other hand, the removal of the pores in the film needs extra energy to make the thin film dense.
As described above, the processes using metal salts are basically thermal decomposition methods that cause many problems in film qualities after heat treatment.

Method used

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Examples

Experimental program
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Effect test

example 2

[0138] The tetrahydrofuran solution obtained Example I was concentrated by a rotary evaporator under reduced pressure in a bath of 50.degree. C. to give a light yellow, transparent, viscous liquid of a concentration of 40.2% by weight in terms of titanium oxide. The liquid dissolved again when a tetrahydrofuran solvent was added to it.

1TABLE 1 Distilled Water / Concentration Ti(i- in OC.sub.3H.sub.7).sub.4 terms of Appearance Appearance at (mol ratio) TiO.sub.2 (%) at -74.degree. C. room temp. Example 1 1.6 5.4 Light Light yellow, yellow, transparent transparent Example 2 1.6 40.2 --Light yellow, transparent Comparative 2.0 5.4 Light Cloudy, gel Example 1 yellow, transparent Comparative 2.4 5.4 Light Cloudy, gel Example 2 yellow, transparent

example 3

[0139] 12.4 g of titanium tetraisopropoxide (A-1; produced by Nippon Soda Co., Ltd., purity: 99%, a concentration of 28.2% by weight in terms of titanium oxide) was dissolved in 45.Og of toluene in a four neck flask, replaced with nitrogen gas, and cooled to -80.degree. C. in an ethanol / liquid nitrogen bath. Separately, 1.26 g (H.sub.2O / Ti=1.6 molar ratio) of ion-exchanged water was mixed with 11.3 g of isopropanol, cooled to -80 to -70.degree. C., and, keeping this condition, dropped in the four neck flask with stirring for hydrolysis. While dropping, the liquid temperature in the flask was kept to -80 to -70.degree. C. Upon the completion of the dropping, the reaction solution was stirred for 30 minutes while cooling, and then warmed up to room temperature with stirring to give a colorless, transparent sol of a concentration of 5% by weight in terms of titanium oxide. The solution had 85% of visible ray transmittance (550 nm).

example 4

[0140] The solution obtained in Example 3 was concentrated by a rotary evaporator in a bath of 50.degree. C. to give a viscous liquid of a concentration of 54.3% by weight in terms of titanium oxide. The liquid dissolved again when a toluene solvent was added to it.

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Abstract

A dispersed ingredient having metal-oxygen bonds which is obtained by hydrolyzing a metal alkoxide in an organic solvent in the absence of an acid, a base, and / or a dispersion stabilizer, either with 0.5 to less than 1 mol of water per mol of the metal alkoxide or at -20° C. or lower with 1.0 to less than 2.0 mol of water per mol of the metal alkoxide. In the organic solvent, the dispersed ingredient is stably dispersed without aggregating. Use of the dispersed ingredient enables a thin metal oxide film and a homogeneous organic / inorganic composite to be produced at a temperature as low as 200° C. or below.

Description

[0001] The present invention relates to dispersed ingredients having metal-oxygen bonds, thin metal oxide films produced from the said ingredients, and organic-inorganic composites containing, as components, the said ingredients or inorganic polymers produced from the ingredients.[0002] An organic-inorganic composite that an inorganic component is compounded in an organic polymer (which is sometimes called organic-inorganic hybrid or organic-inorganic composite polymer) has drawn attention as an industrial material with new properties that are both of the characters of the organic polymer and the inorganic component.[0003] Particularly when an organic-inorganic composite is produced to be used for a plastic lens with a high refractive index, use of titanium oxide as the inorganic component is considered to be favorable.[0004] An example of the organic-inorganic composite produced with a titanium oxide sol is disclosed in Japanese Patent Laid-open No. Hei 8-157735 which describes a p...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C08F291/00C08K5/00C08L51/00C08L51/10C09D1/00
CPCC08F291/00C08G18/3876C08G18/775C08K5/0091C08L51/003C08L51/10C09D1/00G02B1/041
Inventor TOKI, MOTOYUKIHIGUCHI, AKIJIKIMURA, NOBUOFUJITA, YOSHITAKA
Owner NIPPON SODA CO LTD
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