Fluorine-containing alkylsulfobetaines, a process for their preparation and their use

US4430272A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Winfried Ehrl · Neuötting, DE
• Siegfried Jung · Karben, DE

Key dates

• Filing date: Feb 9, 1982
• Grant date: Feb 7, 1984
• Expiry date: Feb 9, 2002

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A62D1/0085
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

Fluorine-containing alkylsulfobetaines of the general formula ##STR1## wherein R.sub.f denotes a perfluoroalkyl radical having 3 to 16 C atoms, R.sub.1 and R.sub.2, which can be identical or different, denote alkyl radicals or hydroxyalkyl radicals having 1 to 4 C atoms, a is zero or 1, b assumes the value 1 when a is equal to 1 and the values 1 to 4 when a is equal to 0, and c is 3 or 4, are described. These are prepared by reacting the corresponding fluorine-containing amines with propanesultone or butanesultone in organic solvents. The compounds are distinguished in particular by high interfacial activity at the interface of water with non-miscible organic liquids and by compatibility with other surfactants. They are suitable for use as aftertreatment agents (auxiliary dispersing agents) in dispersions of fluoropolymers and as components in fire-extinguishing agents.