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    PROCESS FOR PREPARING AN AQUEOUS POLYMER DISPERSION
    51.
    发明专利
    PROCESS FOR PREPARING AN AQUEOUS POLYMER DISPERSION 未知

    公开(公告)号：CA2201168A1

    公开(公告)日：1996-04-11

    申请号：CA2201168

    申请日：1995-09-23

    Applicant: BASF AG

    Inventor： RUPANER ROBERT ,  BAUMSTARK ROLAND

    IPC: C08F2/00 ,  C08F2/16 ,  C08F2/22 ,  C08F4/40 ,  C08F6/00 ,  C08F12/08 ,  C08F14/06 ,  C08F14/08 ,  C08F18/08 ,  C08F18/10 ,  C08F20/04 ,  C08F20/12 ,  C08F20/56 ,  C08F6/14

    Abstract: A process is disclosed for preparing an aqueous polymer dispersion. An aqueous dispersion of a polymer that contains at least one chemically bound, incorporated monomer containing at least one ethylenically unsaturated group, is prepared in a manner known per se, so that the aqueous polymer dispersion contains in total more than 0 but less than or 1 % by weight of free, i.e. non chemically bound monomers having an ethylenically unsaturated double bond, in relation to the polymer content of the aqueous polymer dispersion. This residual monomer content is then reduced with a radical redox initiator system containing at least one oxidising agent and at least one reducing agent. The redox initiator system contains as reducing agent a reducing agent that is present in an aqueous solution in at least two mutually balanced tautomer forms, for example the aminoiminomethanosulfinic acid and/or its salts.

    54.
    发明专利
    未知

    公开(公告)号：DE59911338D1

    公开(公告)日：2005-01-27

    申请号：DE59911338

    申请日：1999-08-25

    Applicant: BASF AG

    Inventor： WOOD CLAUDIA ,  BAUMSTARK ROLAND

    IPC: C08F6/00

    Abstract: A process for reducing the amount of residual monomer in aqueous polymer dispersions operates by aftertreatment with an initiator system essentially comprisinga) from 0.001 to 5% by weight, based on the total monomer amount used to prepare the polymer dispersion,a1) of an oxidizing agent where R1 is hydrogen or a C1-C8-alkyl or a C6-C12-aryl group, and/ora2) of a compound which in aqueous medium releases hydrogen peroxide, andb) from 0.005 to 5% by weight, based on the total monomer amount used to prepare the polymer dispersion,b1) of an alpha-hydroxycarbonyl compound where R2 and R3 independently of one another are hydrogen and/or a C1-C12-alkyl group which may contain functional groups and/or may be olefinically unsaturated, or R2 and R3 optionally, by way of methylene groups, form a ring structure which may contain functional groups and/or may be olefinically unsaturated, and/orb2) of a compound which in aqueous medium releases such alpha-hydroxycarbonyl compounds, andc) advantageously, catalytic amounts of a polyvalent metal ion which is able to exist in a plurality of valence states.

    59.
    发明专利
    未知

    公开(公告)号：DE19839199A1

    公开(公告)日：2000-03-02

    申请号：DE19839199

    申请日：1998-08-28

    Applicant: BASF AG

    Inventor： HEIBEL CLAUDIA ,  BAUMSTARK ROLAND ,  DOBBELAAR JOHANNES

    IPC: C08F6/16 ,  C08F6/00 ,  C08F6/10

    Abstract: The invention relates to a method for reducing the quantity of residual monomers in aqueous polymeric dispersions by aftertreatment with an initiator system essentially comprising: a) 0.001 to 5 % by weight, in relation to the overall amount of monomers used for the production of the polymeric dispersion, of a1) an oxidant R OOH, wherein R represents hydrogen, a C1- to C8-alkyl group or a C6- to C12-aryl group and/or a2) a compound releasing hydrogen peroxide in an aqueous medium and b) 0.005 to 5 % by weight of a reducing agent, in relation to the overall amount of monomers used in the production of the polymeric dispersion, produced from b1) an aldehyde R CH=O, wherein R represents a C1- to C12-alkyl group, containing functional groups and/or may be olefinically unsaturated and b2) an inorganic dithionite and c) catalytic portions of a multivalent metal ion that can be present in several valence states.

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