公开(公告)号：DE3709921A1

公开(公告)日：1988-10-06

申请号：DE3709921

申请日：1987-03-26

Applicant: BASF AG

Inventor： REHMNER GERD DR ,  NIESSNER MANFRED DR ,  HEIDE WILFRIED DR ,  HARTMANN HEINRICH DR ,  PETERS KARL-CLEMENS DR

IPC: C08F2/00 ,  C08F2/32 ,  C08F257/00 ,  C08F20/04 ,  C08F20/34 ,  C08F20/54 ,  C08F22/02 ,  C08F22/36 ,  C08F26/00

Abstract: Polymers in bead form are prepared from water-soluble ethylenically unsaturated monomers by a reverse suspension polymerization of a liquid in the presence of polymerization initiators and protective colloids obtainable by grafting polymers (A) containing (a) aromatic monovinyl monome from 40 to 100% by weight (b) C3-6 monoethylenically unsaturated carboxylic acid and/or maleic anhydride from 0 to 60% by weight (c) other monoethylenically unsaturated monomers from 0-20% by weight, as copolymerized units with the proviso that the sum of the weight (a) to (c) is always 100 and the polymer (A) has a molecular weight (number average) from 500 to 20,000 and a hydrogenation iodine number from 1.3 to 51 with a fixed monomer mixture at given concentration levels.