Inorganic pigment mixt. containing filler - and as dispersant, phosphoro-polysiloxane, to increase dispersibility in plastics

摘要

Inorganic pigments (IA) and fillers (IB) with improved dispersibility in plastics have a coating of phosphoropolysiloxane (II), pref. in an amt. of 0.1-2 (0.2-1)% w.r.t. the wt. of (I).S (II) can be linear, branched or cyclic and have the following units, in any sequence: (R'O1/2) (R2SiO) (O2P(OH)) (RSiO3/2) (SiO2) (R3SiO1/2) (in which R and R' independently are H, alkyl, cycloalkyl, aryl and/or alkenyl gps.). Pref. (II) comprise (HO1/2)2(R2SiO)x(O2P(OH))y (in which x is over 6 and y is over 3. x+y = 10-1400, pref.90-800). (II) have a P content of 0.1-15 (1.5-4.5)%. (II), opt. in diluted or emulsified form, can be applied to (I) before or during micronisation of the wet or dried filter cake. (I) are specified for use in plastics and for producing (I) batches.