Use of at least partly neutralised polyacrylic acid with a mol. wt. of 5000-30000 containing alkylthio end groups, as an auxiliary material for the wet-milling of calcium carbonate

摘要

The use of polyacrylic acid (I) with an average mol. wt. (M w) of 5000-30000 and with end groups containing sulfur and at least 2 carbon atoms, which is at least partly neutralised with alkali metal hydroxide or ammonia, as auxiliary material for the wet-milling of calcium carbonate. Independent claims are also included for finely-divided suspensions of CaCO 3 containing 0.1-2 wt% (I), obtained by wet-milling in presence of (I).