Hybrid sol for the production of abrasion-resistant SiO2 antireflection coatings

US7241505B2 · kind B2 · utility

Assignee

• Merck Patent GmbH · DE

Inventors

• Walther Glaubitt · Würzburg, DE
• Monika Kursawe · Seeheim-Jugenheim, DE
• Andreas Gombert · Glückstadt, DE
• Thomas Hofmann · San Diego, US

Key dates

• Filing date: Sep 19, 2002
• Grant date: Jul 10, 2007
• Expiry date: Jan 21, 2023

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31612
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

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.