Liquid composition for forming silica porous film and silica porous film formed from such liquid composition
First Claim
1. A liquid composition for forming a silica porous film, comprisinga hydrolyzate of tetramethoxysilane or tetraethoxysilane as a silicon alkoxide, anda silica sol in which fumed silica particles having primary particles having a mean particle diameter of 40 nm or less and secondary particles having a mean particle diameter of 20 nm to 400 nm, that is greater than the mean particle diameter of the primary particles, are dispersed in a liquid medium,wherein a mass ratio (A/B) between a SiO2 content (A) in the hydrolyzate and a SiO2 content (B) of the silica sol is in a range of 1/99 to 60/40,the hydrolyzate of tetramethoxysilane or tetraethoxysilane is obtained by a hydrolysis reaction of tetramethoxysilane or tetraethoxysilane in the presence of an acidic catalyst,a SiO2 concentration of the hydrolyzate is 1% by mass to 20% by mass, anda SiO2 concentration of the silica sol is 5% by mass to 40% by mass.
1 Assignment
0 Petitions
Accused Products
Abstract
A liquid composition for forming a silica porous film of the invention is prepared by mixing a hydrolyzate of tetramethoxysilane or tetraethoxysilane as a silicon alkoxide with a silica sol in which fumed silica particles having primary particles having a mean particle diameter of 40 nm or less and secondary particles having a mean particle diameter of 20 nm to 400 nm, that is greater than the mean particle diameter of the primary particles, are dispersed in a liquid medium, in which the mass ratio (A/B) of the SiO2 content (B) of the silica sol to the SiO2 content (A) in the hydrolyzate is in a range of 1/99 to 60/40.
10 Citations
3 Claims
-
1. A liquid composition for forming a silica porous film, comprising
a hydrolyzate of tetramethoxysilane or tetraethoxysilane as a silicon alkoxide, and a silica sol in which fumed silica particles having primary particles having a mean particle diameter of 40 nm or less and secondary particles having a mean particle diameter of 20 nm to 400 nm, that is greater than the mean particle diameter of the primary particles, are dispersed in a liquid medium, wherein a mass ratio (A/B) between a SiO2 content (A) in the hydrolyzate and a SiO2 content (B) of the silica sol is in a range of 1/99 to 60/40, the hydrolyzate of tetramethoxysilane or tetraethoxysilane is obtained by a hydrolysis reaction of tetramethoxysilane or tetraethoxysilane in the presence of an acidic catalyst, a SiO2 concentration of the hydrolyzate is 1% by mass to 20% by mass, and a SiO2 concentration of the silica sol is 5% by mass to 40% by mass.
Specification
-
- Resources
-
Current AssigneeMitsubishi Materials Corporation
-
Original AssigneeMitsubishi Materials Corporation
-
InventorsMasuyama, Koutaro, Higano, Satoko, Yamasaki, Kazuhiko
-
Primary Examiner(s)Mayes, Melvin C.
-
Assistant Examiner(s)Forrest, Michael
-
Application NumberUS15/124,114Publication NumberTime in Patent Office1,693 DaysField of SearchUS Class CurrentCPC Class CodesB01D 2325/0283 Pore sizeB01D 53/228 characterised by specific m...B01D 67/0048 by sol-gel transitionB01D 71/027 Silicium oxideB01J 21/08 SilicaB01J 35/23 in a colloidal stateB01J 37/0215 CoatingB01J 37/0236 Drying, e.g. preparing a su...C01B 33/126 Preparation of silica of un...C09D 1/00 Coating compositions, e.g. ...
