Wacker-chemie Gmbh

Kurt Ullrich

Karl Huhn

Heinrich Marwitz

Bernward Deubzer

Michael Geck

Gerhard Preiner

Johann Muller

Peter Habereder

Hans-Juergen Lautenschlager

Petra Stinglhammer

Christine Seidl

The invention relates to the preparation of organopolysiloxane microemulsions, wherein the components (A) organopolysiloxane, (B) emulsifier, (C) water, optionally, (D) cosurfactant and optionally (E) acid are brought together and mixed in any desired sequence. Microemulsions are formed spontaneously without introduction of energy in the form of heat or severe shearing forces.

Preparation of organopolysiloxane microemulsions

The invention relates to a process for preparing polyorganosiloxane-containing emulsions having a mean particle size of less than 0.3 .mu.m in which, in a first step,

Highly dispersed organopolysiloxane emulsions

Aqueous emulsions for impregnating organic fibers, comprising, in addition to water and dispersants, (1) a diorganopolysiloxane having a Si-bonded hydroxyl group in each terminal unit and whose organic radicals are free of basic nitrogen atoms; (2) an organopolysiloxane containing diorganosiloxane units in which the two organic radicals are monovalent hydrocarbon radicals and also contains at least two monovalent SiC-bonded organic radicals per molecule having a basic nitrogen atom in which the organopolysiloxane is present in the emulsion in an amount of from 5 to 50 weight percent based on the weight of the diorganopolysiloxane (1); (3) an organosilicon compound selected from an organosilane containing at least two SiOC-bonded monovalent organic radicals consisting of carbon, hydrogen and possibly oxygen and/or partial hydrolyzates thereof, in which the organosilicon compound is present in the emulsion in an amount of from 2 to 6 weight percent based on the total weight of the diorganopolysiloxane (1) and organopolysiloxane (2); and (4) a condensation catalyst, which is present in an amount of from 0.2 to 1 weight percent based on the total weight of the diorganopolysiloxane (1) and organopolysiloxane (2). These aqueous emulsions are prepared by mixing the organosilicon compound (3) with an emulsion of diorganopolysiloxane (1) and organopolysiloxane (2) and thereafter mixing the resultant mixture with the condensation catalyst (4).

Method for preparing aqueous emulsions

Organopolysiloxanes having SiC-bonded oxyalkylene units and Si-bonded hydroxyl groups, in which an average of at least 15 mol percent of the siloxane units contain only one SiC-bonded monovalent organic radical and the silicon valences which are not satisfied by the SiC-bonded monovalent organic radical are satisfied by siloxane oxygen atoms or oxygen atoms of hydroxyl groups. These organopolysiloxanes are preferably prepared by reacting triorganosiloxy end-blocked organopolysiloxanes consisting of diorganosiloxane units, in which at least part of these units contain SiC-bonded oxyalkylene units and, if appropriate, organohydrogensiloxane units or organohydroxyl siloxane units or organoalkoxysiloxane units of mixtures of at least two such monoorganosiloxy units with water in the presence of an acid or base or, and subsequently with a silane or simultaneously with water and a silane in which the silane contains one SiC-bonded monovalent organic radical, or partially hydrolyzed products of the silane. The new organopolysiloxanes are applied to textile fibers to impart hydrophilic properties thereto.

Organopolysiloxanes having SiC-bonded oxyalkylene units and a method for

A process for coating a substrate which comprises applying to the substrate an aqueous emulsion containing:

Process for coating substrates with aqueous emulsions containing

A process for coating a substrate which comprises coating the substrate with a solution containing an organic solvent and

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Burghausen, Germany

Kurt Ullrich