Etching glass with HF and fluorine-containing surfactant

US4055458A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Hans Niederprum · Monheim, DE
• Heinz Klein · Bonn, DE
• Johann-Nikolaus Meussdoerffer

Key dates

• Filing date: Jul 30, 1976
• Grant date: Oct 25, 1977
• Expiry date: Jul 30, 1996

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C03C15/02
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

In the etching of glass wherein glass is contacted with an aqueous etching bath containing hydrofluoric acid, and the glass is thereafter removed from the bath and rinsed, the improvement which comprises dissolving in the etching bath an acid-resistant wetting agent. Preferably the wetting agent contains fluorine, e.g. a perfluoralkane sulfonic acid quaternary ammonium salt, a perfluoralkane carboxylic acid salt, an alkoxylation product of a perfluoralkane sulfonamide, or the like.