Coolant for cooling systems in fuel element drives

    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

    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

    69.
    发明专利
    未知

    公开(公告)号:DE19754039A1

    公开(公告)日:1999-06-24

    申请号:DE19754039

    申请日:1997-12-05

    Applicant: BASF AG

    Abstract: The invention relates to a method for producing ethylene/vinyl acetate copolymers in which a mixture comprised of ethylene and vinyl acetate is continuously polymerized in the presence of radical polymerization initiators and optional molecular weight modifiers in a cooled tubular reactor at a pressure ranging from 1000 to 3500 bar. The polymerization initiator is charged at the beginning and at a number of positions along the tubular reactor, and the temperature changes in the reaction mixture range no more than 20 C between the first maximum temperature and the last charging of the polymerization initiator along the tubular reactor.

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