公开(公告)号：DE19727502A1

公开(公告)日：1999-01-07

申请号：DE19727502

申请日：1997-06-27

Applicant: BASF AG

Inventor： FISCHER MICHAEL DR ,  MORRISON BRADLEY ROLAND DR ,  SUTORIS HEINZ FRIEDRICH DR ,  DURANT YVON DR

IPC: C08F2/00 ,  C08F2/22 ,  C08F2/24 ,  C08F4/00 ,  C08F4/04 ,  C08F4/28 ,  C08F4/34 ,  C08F12/08 ,  C08F12/12 ,  C08F20/18 ,  C08F20/44

Abstract: A radical-initiated emulsion polymerisation method for the preparation of an aqueous polymer dispersion, containing at least one compound with an ethylenic unsaturated group emulsified in an aqueous medium using a dispersant, is carried out using a radical polymerisation initiator in the presence of a stabil N-oxyl radical. The initiator is a (hydro)peroxide and/or azo compound which has a molar solubility in water at 25 deg C and a bar which is greater than or equal to the corresponding molar solubility of tert-butyl hydroperoxide in water, and which has a degradation temperature less than 100 deg C in the polymerisation medium. The polymerisation step is carried out at a temperature greater than 100 deg C at a pressure greater than the vapour pressure of the polymer mixture present in the polymerisation vessel. Also claimed are aqueous polymer dispersions prepared by this method.