Hybrid sol for the production of abrasion-resistant SiO2 antireflection coatings
First Claim
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1. Hybrid sol comprising:
- [SiOx(OH)y]n particles, where 0<
y<
4 and 0<
x<
2, which consist of a mixture of a first fraction of particles having a particle size of 4–
15 nm and a second fraction of particles having a mean particle size of 20–
60 nm where the weight ratio between the first fraction and the second fraction is from 10;
1 to 2;
1,water anda solvent,wherein the sol is obtained by a process comprising;
hydrolytic polycondensation of tetraalkoxysilanes in an aqueous, solvent-containing medium by addition of the tetraalkoxysilanes to the aqueous, solvent-containing medium, resulting in a hydrolysis mixture comprising silicon oxide hydroxide particles having a particle size of 4–
15 nm,followed by addition to the hydrolysis mixture of a monodisperse silicon oxide hydroxide sol essentially in the form of discrete particles having a mean particle size of 20–
60 nm and a maximum standard deviation of 20%, said addition being at least 5 minutes after addition of the tetraalkoxysilanes to the aqueous, solvent-containing medium.
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Abstract
Hybrid sol comprising [SiOx(OH)y]n particles, where 0<y<4 and 0<x<2, which consist of a mixture of a first fraction of particles having a particle size of 4–15 nm and a second fraction of particles having a mean particle size of 15–60 nm, water and a solvent; obtainable by hydrolytic polycondensation of tetraalkoxysilanes in an aqueous, solvent-containing medium with addition of a monodisperse silicon oxide hydroxide sol having a mean particle size of 15–60 nm and a maximum standard deviation of 20%, and the preparation and use thereof.
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Citations
22 Claims
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1. Hybrid sol comprising:
-
[SiOx(OH)y]n particles, where 0<
y<
4 and 0<
x<
2, which consist of a mixture of a first fraction of particles having a particle size of 4–
15 nm and a second fraction of particles having a mean particle size of 20–
60 nm where the weight ratio between the first fraction and the second fraction is from 10;
1 to 2;
1,water and a solvent, wherein the sol is obtained by a process comprising; hydrolytic polycondensation of tetraalkoxysilanes in an aqueous, solvent-containing medium by addition of the tetraalkoxysilanes to the aqueous, solvent-containing medium, resulting in a hydrolysis mixture comprising silicon oxide hydroxide particles having a particle size of 4–
15 nm,followed by addition to the hydrolysis mixture of a monodisperse silicon oxide hydroxide sol essentially in the form of discrete particles having a mean particle size of 20–
60 nm and a maximum standard deviation of 20%, said addition being at least 5 minutes after addition of the tetraalkoxysilanes to the aqueous, solvent-containing medium.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. Process for the preparation of a hybrid sol comprising:
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[SiOx(OH)y]n particles, where 0<
y<
4 and 0<
x<
2, which consist of a mixture of a first fraction of particles having a particle size of 4–
15 nm and a second fraction of particles having a mean particle size of 20–
60 nm,water and a solvent, which process comprises;
hydrolytic polycondensation of a tetraalkoxysilane in an aqueous, solvent-containing medium by addition of the tetraalkoxysilanes to the aqueous, solvent-containing medium, resulting in a hydrolysis mixture comprising silicon oxide hydroxide particles having a particle size of 4–
15 nm, followed by addition of a monodisperse silicon oxide hydroxide sol having a mean particle size of 20–
60 nm and a maximum standard deviation of 20% to the hydrolysis mixture at a time at least 5 minutes after addition of the tetraalkoxysilane to the aqueous, solvent-containing medium. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
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Specification