Methylpolysiloxanes with quaternary ammonium groups as corrosion inhibitors for preparations consisting predominantly of water

US5246607A · kind A · utility

Assignee

• Th. Goldschmidt. AG · DE

Inventors

• Dietmar Schaefer · Hattingen, DE
• Werner Hohner · Velbert, DE

Key dates

• Filing date: Oct 12, 1989
• Grant date: Sep 21, 1993
• Expiry date: Oct 12, 2009

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C23F11/173
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

Methylpolysiloxanes are disclosed which have quaternary ammonium groups linked to silicon atoms via carbon atoms, wherein the ratio of the number of dimethylsiloxy groups to the number of quaternary ammonium groups has a value of 0.5 to 1.5. The methylpolysiloxanes are useful as corrosion inhibitors for preparations consisting predominantly of water, especially coolants, such as cooling lubricants mixed with water, in an amount of 0.01 to 0.1% by weight, based on the total preparation in the form suitable for use.