公开(公告)号：DE2544218A1

公开(公告)日：1977-04-21

申请号：DE2544218

申请日：1975-10-03

Applicant: BASF AG

Inventor： LEUTNER BERND DIPL CHEM DR ,  SCHLIMPER HANS-ULRICH DIPL CHE ,  WURMB ROLF DIPL CHEM DR ,  TEYSOHN RAINER DIPL CHEM DR

IPC: C08K9/12 ,  C09C1/00 ,  C09C1/04 ,  C09C1/28 ,  C09C1/30 ,  C09C3/06 ,  C08K3/22

Abstract: Fillers contg. ZnO, made by simultaneous addn. of a Zn salt in aq. soln. and a base to an aq. suspension contg. 30 wt. % max. inorganic carrier, to maintain pH 10-12. The carrier is pref. silica, a silicate and/or carbonate; Max. rate of addn. of Zn salt is 0.003 mol/min. for each g. carrier per 1. suspension. Pref. after addn. of 90% of the Zn salt required, the pH is reduced to 9-10. Temp. of the suspension is pref. 30-80 degrees (45-55 degrees)C. Synergistic action in combination with other flame retardants, e.g. halogenated cpds., is increased. Lower amounts can be used and adverse effect on mechanical properties of the polyamide reduced.