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    4.
    发明专利
    未知

    公开(公告)号：AT261423T

    公开(公告)日：2004-03-15

    申请号：AT00938781

    申请日：2000-06-09

    Applicant: BASF AG

    Inventor： SUTORIS HEINZ FRIEDRICH ,  MITULLA KONRAD

    IPC: B01J19/00 ,  C07B63/04 ,  C07C7/05 ,  C07C7/20 ,  C07C15/46 ,  C08F2/38 ,  C08F2/40 ,  C08F12/00

    Abstract: A process for preventing undesired polymerization is conducted by maintaining an effective concentration of a stabilizer which comprises N-oxyl radicals in a mixture containing ethylenically unsaturated compounds, wherein(i) an electronic signal which correlates with the concentration of the N-oxyl radicals in the mixture is obtained periodically or continuously,(ii) the electronic signal is compared with a reference value, and(iii) addition of a stabilizer to the mixture is controlled according to the comparison (ii).The signal is preferably obtained by ESR measurement. The process permits efficient use of the stabilizer.

    6.
    发明专利
    未知

    公开(公告)号：BR0008544A

    公开(公告)日：2001-11-06

    申请号：BR0008544

    申请日：2000-02-25

    Applicant: BASF AG

    Inventor： MITULLA KONRAD ,  SUTORIS HEINZ FRIEDRICH

    IPC: B01D3/32 ,  C07B63/04 ,  C07C7/05 ,  C07C7/20 ,  C07C15/46

    Abstract: The invention relates to a method for the continuous recovery of styrene from a mixture containing same, by distillation of the mixture in a cascade of n distillation columns. According to said method, (i) an inflow containing a stabilizer system is fed into the first column and/or is placed into at least one of the distillation columns positioned upstream of the nth distillation column, whereby said stabilizer system comprises N-oxyl radicals; (ii) in the bottom of the nth distillation column a high-boiling fraction containing the stabilizer system and boiling at a higher temperature than styrene is concentrated; (iii) a partial flow of the high-boiling fraction is recycled and placed into at least one distillation column positioned upstream of the nth distillation column; and (iv) the remainder of the high-boiling fraction is withdrawn from the process.

    THERMOPLASTIC MOLDING MATERIALS
    10.
    发明专利
    THERMOPLASTIC MOLDING MATERIALS 未知

    公开(公告)号：CA1255833A

    公开(公告)日：1989-06-13

    申请号：CA478835

    申请日：1985-04-11

    Applicant: BASF AG

    Inventor： MITULLA KONRAD ,  HAMBRECHT JUERGEN ,  ECHTE ADOLF ,  SWOBODA JOHANN ,  SIEBEL PETER ,  SCHWAAB JOSEF ,  FRANK HERBERT

    IPC: C08L51/00 ,  C08L51/04 ,  C08L69/00

    Abstract: - 20 - O.Z. 0050/37072 A thermoplastic molding material consists of a polycarbonate A and a graft copolymer B, the latter consisting of an elastomer (rubber) b1) and a shell b2) grafted onto the elastomer. The elastomer b1) contains, as copolymerized units, from 35 to 100% by weight of a diene from the group consisting of the conjugated dienes of 4 or 5 carbon atoms, and can contain, as copolymerized units, from 0 to 65% by weight of a monomer from the group consisting of the alkyl acrylates or alkyl methacrylates, where alkyl is of 1 to 8 carbon atoms. The shell b2) is obtained in a conventional manner by successive polymerization of the monomers constituting the shell, in two process steps, in the presence of the elastomer b1); in a first process step, from 10 to 90% by weight of a mixture of a vinylaromatic hydrocarbon and one or more ethylenically unsaturated monomers which differ from the said hydrocarbon, in a weight ratio of from 90:10 to 60:40, are first incorporated as copolymerized units, followed by the polymerization of from 90 to 10% by weight of a monomer from the group consisting of the alkyl acrylates or of the alkyl methacrylates, where alkyl is of 1 to 8 carbon atoms. The molding material is used for the production of shaped articles.

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