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    4.
    发明专利
    未知

    公开(公告)号：ES2190018T3

    公开(公告)日：2003-07-16

    申请号：ES98115370

    申请日：1998-08-14

    Applicant: BASF AG

    Inventor： HUBINGER WOLFGANG DR ,  WUNDER RAINER DR ,  BAUER GERHARD DR ,  DOBBELAAR JOHANNES DR ,  LAWRENZ SVEN ,  MUESELER FRANZ-JOSEF DR

    IPC: B01D17/00 ,  B01J19/00 ,  B01J19/18 ,  B01J19/24 ,  C08F6/00 ,  C08J3/03

    Abstract: A method for cooling dispersions or liquids (D/L) after a deodorising process comprising (a) passing steam through the D/L in a boiler (1), causing it to foam, (b) taking the foam from the top of the boiler into an evacuated separator (4) through a jet (5) and thus breaking the foam, (c) condensing the water vapour from the foam in a heat exchanger (8) and removing organic volatiles, and (d) returning the broken foam to (1). This process is continued until the D/L is deodorised to the required extent, then the hot D/L is cooled by transferring it from the bottom of (1) to the evacuated separator (4) via jet (5), the water vapour produced is condensed in (8) as before, and the cooled D/L is taken off at the bottom of (4).

    Reducing residual monomer content in aqueous polymer dispersion
    5.
    发明专利
    Reducing residual monomer content in aqueous polymer dispersion 未知

    公开(公告)号：DE19741187A1

    公开(公告)日：1999-03-25

    申请号：DE19741187

    申请日：1997-09-18

    Applicant: BASF AG

    Inventor： RUPANER ROBERT DR ,  BAUER GERHARD DR ,  LAWRENZ SVEN ,  HEIBEL CLAUDIA DR ,  DOBBELAAR JOHANNES DR

    IPC: C08F6/00 ,  C08F6/06

    Abstract: The residual monomer content of aqueous polymer dispersions is reduced by further treatment with an initiator system containing a peroxide, a saturated alpha - hydroxycarboxylic acid and, optionally, multivalent ions of a variable-valency metal. A method for reducing the residual monomer content in aqueous polymer dispersions comprises post-treatment by addition of an initiator system essentially containing: (a) 0.01-5 wt% (based on total amount of monomers used to make the dispersion) of a compound of formula: R -O-O-R (a1), and/or a compound which liberates hydrogen peroxide (H2O2) in aqueous medium (a2); (b) 0.01-30 wt% alpha -hydroxy- carboxylic acid with no polymerisable carbon-carbon double bonds or a salt thereof; and (c) 0-1000 ppm multivalent metal ions of variable valency. R and R = H, 1-8 C alkyl or 6-12 C aryl, at least one of these groups being H;

    9.
    发明专利
    未知

    公开(公告)号：ID18247A

    公开(公告)日：1998-03-19

    申请号：ID972799

    申请日：1997-08-11

    Applicant: BASF AG

    Inventor： SCHULER BERNARD DR ,  AUCHTER GERHARD DR ,  TURK JOHANNES ,  NORDIJK RIK ,  DOBBELAAR JOHANNES DR ,  BACHER REIHARD DR ,  HUMMER WOLFGANG DR

    IPC: C08F220/12 ,  C09J7/04 ,  C09J133/06 ,  C09J135/06 ,  C08F2/22 ,  C08F279/06

    Abstract: A polymer which containsfrom 50 to 99.98% by weight of a C1-C12 alkyl (meth)acrylate a),from 0.02 to 10% by weight of a vinylaromatic compound b),from 0 to 10% by weight of an ethylenically unsaturated acid or of an ethylenically unsaturated acid anhydride c), andfrom 0 to 40% by weight of further monomers d), the percentages by weight being based on the polymer and the polymer being obtainable by polymerizing the monomers a) to d) in at least two stages which differ in their content of vinylaromatic compounds in such a way that the content of vinylaromatic compounds in the vinylaromatics-rich stage is at least 5 times as great as in the low-vinylaromatics stage.

    Reducing residual monomer content of liquid system in polymer production
    10.
    发明专利
    Reducing residual monomer content of liquid system in polymer production 未知

    公开(公告)号：DE19741189A1

    公开(公告)日：1999-03-25

    申请号：DE19741189

    申请日：1997-09-18

    Applicant: BASF AG

    Inventor： RUPANER ROBERT DR ,  DOBBELAAR JOHANNES DR ,  LAWRENZ SVEN ,  BAUER GERHARD DR

    IPC: C08F6/00

    Abstract: Method of reducing the residual monomer (I) content in a solution, mixture, melt, suspension or dispersion of a polymer produced by free radical polymerization (liquid system). The process involves adding a nucleophilic agent (II), which forms an adduct with (I) at the reaction temperature, in an amount of 0.5-5 mole (II) /mole (I). The novelty is that (II) is stirred gradually into the liquid system in a production reactor with a height/diameter ratio of 0.8-4 in a dosing time not less than the shortest possible mixing time.

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