Cooling agents for cooling systems in fuel cell drives

US7393464B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Bernd Wenderoth · Lampertheim, DE
• Ladislaus Meszaros · Mutterstadt, DE
• Stefan Dambach · Nümbrecht, DE
• Uwe Fidorra · Monsheim, DE
• Marco Bergemann · Hockenheim, DE

Key dates

• Filing date: Dec 14, 2001
• Grant date: Jul 1, 2008
• Expiry date: Jan 3, 2022

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T90/40
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

The invention relates to antifreeze concentrates for cooling systems in fuel cell drives, from which are produced ready-to-use aqueous cooling agent compositions having a maximum conductivity of 50 μs/cm, based on alkylene glycols or the derivatives thereof, and containing orthosilicic acid esters of formula (I) wherein the variables R1 to R4 are the same or different and represent C1-C20 alkyl substituents, C2-C20 alkenyl substituents, C1-C20 hydroxyalkyl substituents, optionally substituted C6-C12 aryl substituents and/or glycol ether substituents of formula (CH2—CH2—O)n—R5 wherein R5 represents hydrogen or C1-C5 alkyl and n represents a number between 1 and 5