Wacker Chemie Ag

Wacker-chemie Gmbh

Thomas Koehler

Wolfgang Schattenmann

Reinhard Haerzschel

Manfred Meisenberger

Georg Loher

Rene Graewe

Wolfgang Ackermann

Heinz Hoefler

Hydraulically setting compositions containing mineral binders exhibit improved adhesion when polymer powders produced by drying a silica sol and a redispersible polymer powder emulsion are added.

Dry building material formulations containing polymer powders

Polyvinyl esters in the form of solid resins are obtained by free-radically initiated suspension polymerization, characterized in that the solid resin for a weight-average molecular weight Mw of &#x3c;300,000 has a polydispersity PD of &#x2267;5 and for a weight-average molecular weight Mw of 300,000 to 1,500,000 has a polydispersity PD of &#x2267;10.

Solid polyvinyl ester and poly(meth)acrylate resins with high polydispersity

The present invention relates to a process for preparing organopolysiloxanes by reacting halosilane with alcohol and water in the presence of the desired organopolysiloxane in a reaction unit comprising a distillation column, optionally a reflux condenser, and a vessel already containing desired organopolysiloxane, by heating the vessel contents to boiling under reflux, introducing halosilane into the column above the lower column end, removing hydrogen halide from the distillation column and continuously removing organopolysiloxane from the vessel at the same rate in which it is formed, by constantly adding halosilane, alcohol and water to the reaction unit in such amounts that more water is always present in the reaction unit than is consumed by the added Si-halogen units of the halosilanes.

Process for continuously preparing low-alkoxy silicone resins

A process for the preparation of organopolysiloxane resins, wherein a silaneRSiOR&#x2003;&#x2003;(I)or a hydrolyzate thereof, and a silaneSi(OR)&#x2003;&#x2003;(II)or a partial hydrolyzate thereof,

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Kastl, Germany

Thomas Koehler