公开(公告)号：NO852586A

公开(公告)日：1985-12-30

申请号：NO852586

申请日：1985-06-27

Applicant: BASF AG

Inventor： BUBAM HANS-GEORG ,  HEIDER LOTHAR ,  BIEDERBECK UWE ,  STANGER BERND

IPC: C08F2/00 ,  C08F2/22 ,  C08F2/24 ,  C08F2/44 ,  C08F212/04 ,  C08F212/06 ,  C08F220/00 ,  C08F220/02 ,  D21H19/58 ,  C08F

CPC classification number: C08F212/06 ,  D21H19/58

公开(公告)号：FI852418A0

公开(公告)日：1985-06-18

申请号：FI852418

申请日：1985-06-18

Applicant: BASF AG

Inventor： BUBAM HANS-GEORG ,  HEIDER LOTHAR ,  BIEDERBECK UWE ,  STANGER BERND

IPC: C08F2/00 ,  C08F2/22 ,  C08F2/24 ,  C08F2/44 ,  C08F212/04 ,  C08F212/06 ,  C08F220/00 ,  C08F220/02 ,  D21H19/58 ,  C08F

Abstract: A process for the preparation of stable aqueous polymer dispersions which contain an alkenyl-aromatic compound as copolymerized units, by polymerizing monomer mixtures which contain (a) not less than 2% by weight of an alkenyl-aromatic compound and (b) from 0.5 to 10% by weight of an ethylenically unsaturated C3-C5-carboxylic acid and/or its amide and/or its nitrile and/or an ethylenically unsaturated monomer containing sulfonic acid groups, with or without (c) acrylic acid esters, methacrylic acid esters and/or butadiene in aqueous emulsion in the presence of a polymerization initiator, with or without an emulsifier and with or without a polymerization regulator, at a pH below 7, in the presence of from 0.2 to 2% by weight of formaldehyde.