公开(公告)号：CZ20031709A3

公开(公告)日：2003-09-17

申请号：CZ20031709

申请日：2001-12-14

Applicant: BASF AG

Inventor： WENDEROTH BERND DR ,  MESZAROS LADISLAUS ,  DAMBACH STEFAN ,  FIDORRA UWE DR ,  BERGEMANN MARCO

IPC: C09K3/00 ,  C09K5/08 ,  C09K5/20 ,  H01M8/04 ,  H01M8/10

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 mus/cm, based on alkylene glycols or the derivatives thereof, and containing orthosilicic acid esters of formula (I) wherein the variables R 1 to R 4 are the same or different and represent C 1 -C 20 alkyl substituents, C 2 -C 20 alkenyl substituents, C 1 -C 20 hydroxyalkyl substituents, optionally substituted C 6 -C 12 aryl substituents and/or glycol ether substituents of formula (CH 2 -CH 2 -O) n -R 5 wherein R 5 represents hydrogen or C 1 -C 5 alkyl and n represents a number between 1 and 5