公开(公告)号：DE19840586A1

公开(公告)日：2000-03-09

申请号：DE19840586

申请日：1998-09-05

Applicant: BASF AG

Inventor： HEIBEL CLAUDIA ,  BAUMSTARK ROLAND

IPC: C08F6/00 ,  C08F6/10

Abstract: The invention relates to a method for reducing the quantity of residual monomers in aqueous dispersions of polymers by re-treatment with an initiator system which essentially comprises the following: a) 0.001 to 5 wt. % (in relation to the total quantity of monomers used to produce the polymer dispersion) of a1) an oxidising agent R OOH, R being hydrogen, a C1- to C8-alkyl group or a C6- to C12-aryl group and/or a2) a compound which releases hydrogen peroxide in an aqueous medium and b) 0.005 to 5 wt. % (in relation to the total quantity of monomers used to produce the polymer dispersion) of b1) an alpha -hydroxycarbonyl compound of formula (I), wherein R and R , independently of each other, mean hydrogen and/or a C1- to C12- alkyl group which can contain functional groups and/or be olefinically unsaturated and R and R optionally form a ring structure with methylene groups and said ring structure can contain functional groups and/or be olefinically unsaturated and/or b2) a compound which releases alpha -hydroxycarbonyl compounds of this type in an aqueous medium and c) advantageously, catalytic quantities of a multivalent metal ion which can occur in several valence states.

公开(公告)号：DE59809028D1

公开(公告)日：2003-08-21

申请号：DE59809028

申请日：1998-09-17

Applicant: BASF AG

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

IPC: C08F6/00

Abstract: A process is described for effectively reducing the residual monomer content of an aqueous polymer dispersion by aftertreatment at atmospheric pressure or above with an initiator system comprising a) a hydroperoxide, hydrogen peroxide or a peracid, and b) an alpha-hydroxy carboxylic acid, such as tartaric acid, or with a salt thereof.

公开(公告)号：DE19809220A1

公开(公告)日：1999-09-09

申请号：DE19809220

申请日：1998-03-04

Applicant: BASF AG

Inventor： HEIBEL CLAUDIA ,  KREMESKOETTER JENS ,  KASTENHUBER WALTER ,  FUNKHAUSER STEFFEN ,  HUEBINGER WOLFGANG ,  ROSSMANITH PETER ,  BECHTEL SIEGFRIED

IPC: C08F2/22 ,  C08F10/00 ,  C08F18/04 ,  C08F20/10 ,  C08F22/10 ,  C08F36/06

Abstract: The invention relates to a method for the continuous production of a polymer dispersion by means of an aqueous radical emulsion polymerization of at least one ethylenically unsaturated monomer in a reactor. According to the invention, an emulsion of the monomer or of the monomers in an aqueous phase is fed into the reactor, and the average droplet size of the monomer drops which are emulsified in an aqueous phase ranges from 1 to 20 mu m according to the polymerization conditions. The method results in a polymer dispersion having a low coagulate content.

公开(公告)号：DE19911170A1

公开(公告)日：2000-09-14

申请号：DE19911170

申请日：1999-03-12

Applicant: BASF AG

Inventor： GOTSCHE MICHAEL ,  HEIBEL CLAUDIA ,  TIEFENSEE KRISTIN

IPC: C08F2/32 ,  C08F4/40 ,  C08F6/00 ,  C08F6/14 ,  C08F220/04

Abstract: A water-in-oil emulsion in which a water-swollen crosslinked polymer is dispersed is produced by treating the emulsion with a redox initiator system to reduce the residual monomer content.

公开(公告)号：AU5854699A

公开(公告)日：2000-03-27

申请号：AU5854699

申请日：1999-08-25

Applicant: BASF AG

Inventor： HEIBEL 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.

公开(公告)号：DE19942301A1

公开(公告)日：2001-03-08

申请号：DE19942301

申请日：1999-09-04

Applicant: BASF AG

Inventor： DREHER STEFAN ,  PAKUSCH JOACHIM ,  SANDOR MARIO ,  RECK BERND ,  HEIBEL CLAUDIA ,  DENU HANS-JUERGEN

IPC: C04B24/26 ,  C04B24/32 ,  C04B28/02 ,  C04B111/72 ,  C08F2/30 ,  C08F220/10 ,  C08F220/18 ,  C08F290/06 ,  C09D1/08 ,  C09D5/34 ,  C09K3/10

Abstract: Cement-based compositions containing an alkyl (meth)acrylate copolymer with 0.5-10 wt% polyethoxy-(meth)acrylate comonomer units with terminal 1-4C alkyl groups Cement-based compositions containing 1-500 parts by weight (pts. wt.) per 100 pts. wt. cement of a polymer derived from (a) 30-99.5 wt% alkyl (meth)acrylate(s), (b) 0-70 wt% vinyl-aromatic(s), (c) 0.5-10 wt% alkyl polyethoxy-(meth)acrylate(s) of formula (I): CH2=C(R )-COO-(-CH2CH2O-)n-R (I), in which R = H or methyl; R = 1-4C alkyl; n = 1-55 , (d) 0-10 wt% unsaturated mono- or di-carboxylic acid(s) or their anhydrides, amides or hydroxyalkylamides, (e) 0-10 wt% (meth)acrylonitrile and (f) 0-50 wt% other unsaturated compounds.

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.

公开(公告)号：AU9541198A

公开(公告)日：1999-04-05

申请号：AU9541198

申请日：1998-09-17

Applicant: BASF AG

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

IPC: C08F6/00

Abstract: A process is described for effectively reducing the residual monomer content of an aqueous polymer dispersion by aftertreatment at atmospheric pressure or above with an initiator system comprising a) a hydroperoxide, hydrogen peroxide or a peracid, and b) an alpha-hydroxy carboxylic acid, such as tartaric acid, or with a salt thereof.

公开(公告)号：DE19942776A1

公开(公告)日：2001-03-15

申请号：DE19942776

申请日：1999-09-08

Applicant: BASF AG

Inventor： HEIBEL CLAUDIA ,  SCHNEIDER REINHARD ,  BECKMANN EBERHARD

IPC: C08F6/00 ,  C08F6/10

Abstract: The invention relates to a method for reducing the quantity of residual monomers in aqueous polymerisate dispersions by post-treating them with a redox initiator system.

公开(公告)号：BR9812464A

公开(公告)日：2000-09-19

申请号：BR9812464

申请日：1998-09-17

Applicant: BASF AG

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

IPC: C08F6/00

Abstract: A process is described for effectively reducing the residual monomer content of an aqueous polymer dispersion by aftertreatment at atmospheric pressure or above with an initiator system comprising a) a hydroperoxide, hydrogen peroxide or a peracid, and b) an alpha-hydroxy carboxylic acid, such as tartaric acid, or with a salt thereof.