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Hollow Silica Microparticles, Compositions for Forming Transparent Coating Film Containing the Same, and Substrate Having Transparent Coating Film

a technology of hollow silica and compositions, applied in the field of hollow silica microparticles, can solve the problems of whitening of obtained films or transparent coating films, and achieve the effects of excellent abrasion resistance and adhesiveness, excellent chemical resistance and water resistance, and efficient production

Inactive Publication Date: 2009-11-19
JGC CATALYSTS & CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0045]The transparent coating film obtained by applying the compositions for forming a transparent coating film containing hollow silica microparticles and a binder according to the present invention has a low refractive index in the range from 1.25 to 1.45, and discoloring such as whitening hardly occurs in the compositions, and the compositions are excellent in the abrasion resistance and the adhesiveness. Furthermore the transparent coating film is also excellent in the chemical resistance and the water resistance, and for instance, when water droplets dropped on a surface of the transparent coating film according to the present invention are wiped off, advantageously no trace of the droplets is left.
[0046]With the production method according to the present invention, the hollow silica microparticles can efficiently be produced.
[0047]Of the substrates each with a transparent coating film according to the present invention, especially those having a transparent coating film in which a specific quantity of hollow silica microparticles are unevenly distributed in the layer state show the excellent characteristics based on the hollow silica microparticles (such as the capability of suppressing reflection and the antistatic property). Furthermore, in the transparent film-coated substrate according to the present invention, when prespecified hollow silica microparticles and prespecified metal oxide microparticles are unevenly distributed in the layered state respectively, in addition to the characteristics provided by the hollow silica microparticles, also the characteristics based on the metal oxide microparticles are easily and strongly shown. Especially, with the compositions for forming a transparent coating film according to the present invention in which prespecified hollow silica microparticles and prespecified metal oxide microparticles are contained, it is possible to obtain a transparent coating film in which hollow silica microparticles and metal oxide microparticles are unevenly distributed in the layered state respectively or a substrate having the transparent coating film.

Problems solved by technology

In the films containing the silica particles or the transparent coating films as described above, there often occurs the problem that the obtained films or the transparent coating films are whitened.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[Preparation of the Hollow Silica Microparticles According to the Present Invention]

[0139]200 g of the hollow silica sol A (with the solid silica concentration of 20 W %) was prepared and subjected to solvent substitution to methanol with a ultrafilter membrane to prepare 100 g of an organosol with the SiO2 concentration of 20 W % (and with the water content of 0.5 W % against the amount of SiO2).

[0140]Then a 28% ammonia aqueous solution was added to 100 g of the organosol so that the ammonia concentration would be 100 ppm, and the mixture solution was sufficiently mixed. Then 4 g of methacrylsilane (produced by Shin-Etsu Chemical Co., Ltd.: KBM503) (by about 20 weight portions against 100 weight portions of SiO2) was added to the mixture solution to obtain a reactant liquid (with the water content of 0.6 W % against the amount of SiO2). The reactant liquid was heated to 50° C. and preserved at the temperature for 15 hours with agitation. After the heating process was completed, the...

example 2

[0152]200 g of the hollow silica sol A (with the solid silica concentration of 20 W %) was prepared and subjected to solvent substitution to methanol with a ultrafilter membrane to prepare 100 g of an organosol with the SiO2 concentration of 20 W % (and with the water content of 0.5 W % against the amount of SiO2).

[0153]Then a 28% ammonia aqueous solution was added to 100 g of the organosol so that the ammonia concentration would be 400 ppm, and the mixture solution was sufficiently mixed. Then 4 g of methacrylsilane (produced by Shin-Etsu Chemical Co., Ltd.: KBM503) (by about 20 weight portions against 100 weight portions of SiO2) was added to the mixture solution to obtain a reactant liquid (with the water content of 1.0 W % against the amount of SiO2). The reactant liquid was heated to 50° C. and preserved at the temperature for 15 hours with agitation. After the heating process was completed, the reactant liquid was cooled down to the room temperature and cleaned with a ultrafil...

example 3

[0154]200 g of the hollow silica sol A (with the solid silica concentration of 20 W %) was prepared and subjected to solvent substitution to methanol with a ultrafilter membrane to prepare 100 g of an organosol with the SiO2 concentration of 20 W % (and with the water content of 0.5 W % against the amount of SiO2).

[0155]Then a 28% ammonia aqueous solution was added to 100 g of the organosol so that the ammonia concentration would be 200 ppm, and the mixture solution was sufficiently mixed. Then 1 g of acrylsilane (produced by Shin-Etsu Chemical Co., Ltd.: KBM5103) (by about 5 weight portions against 100 weight portions of SiO2) was added to the mixture solution to obtain a reactant liquid (with the water content of 0.75 W % against the amount of SiO2). The reactant liquid was heated to 50° C. and preserved at the temperature for 15 hours with agitation. After the heating process was completed, the reactant liquid was cooled down to the room temperature and cleaned with a ultrafilter...

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Abstract

Hollow silica microparticles suppress whitening of a transparent coating film and show excellent abrasion resistance and adhesiveness. The microparticles having the average particle diameter of 5 to 300 nm and the specific surface area of 50 to 1500 m2 / g, and also having an outer shell in which cavities are formed. The microparticles lose the weight by 1.0 W % or more at a temperature range from 200° C. to 500° C. when measured by the thermogravimetry (TG), and the microparticles have a positive DTA peak at the temperature range when measured by the differential thermogravimetric analysis (DTA).

Description

TECHNICAL FIELD[0001]The present invention relates to hollow silica microparticles having a surface processed with a silane compound, a method of producing the hollow silica microparticles, compositions for forming a transparent coating film containing the hollow silica microparticles, and a substrate having a surface coated with a transparent coating film prepare by curing the composition for forming a transparent coating film.BACKGROUND TECHNOLOGY[0002]Hollow silica particles with the diameter of about 0.1 to about 380 μm are well known (Refer to Patent document 1 and Patent document 2). Furthermore, there has been known the method of producing hollow particles having a hard silica shell in which active silica is deposited from an aqueous solution of alkali metal silicate on a core made of a material other than silica, and the material is removed without breaking the silica shell (Refer to Patent document 3).[0003]Furthermore, there has been known the micron-sized spherical silica...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B32B27/00B32B5/16C08K9/04C09D7/62
CPCC09C1/30Y10T428/2993C09D7/1266C09D7/1275C09D7/1291B82Y30/00C01B33/146C01B33/149C01P2002/88C01P2004/34C01P2004/62C01P2004/64C01P2006/12C01P2006/60C08K7/26C08K9/04Y10T428/265Y10T428/2996C09C1/3063C09D7/67C09D7/68C09D7/70C01B33/126C01B33/18C09D7/62C09D201/00B01J21/08C09D133/14C09D183/08
Inventor SUEYOSHI, RYOTAMURAGUCHI, RYOMATSUDA, MASAYUKIKUMAZAWA, MITSUAKIHIRAI, TOSHIHARU
Owner JGC CATALYSTS & CHEM LTD
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