Wacker Chemie Ag

Wacker-chemie Gmbh

Birgit Peschanel

Markus Jandke

Florian Koopmann

Bernward Deubzer

Jochen Dauth

Michael Stepp

Thomas Hierstetter

Urea-functional organopolysiloxanes containing units of the formulaRSiO&#x2003;&#x2003;(I),where R is a radical Ror a radical &#x2014;ORor a radical Q, Q is a urea-functional radical of the formula&#x2014;R&#x2014;[NR&#x2014;R&#x2014;]NRR&#x2003;&#x2003;(II),where the radicals Rare identical or different and are each a radical R' or a radical R, where R&#x2032; is hydrogen or a monovalent C-C-hydrocarbon radical where Ris radical of the formula &#x2014;C(&#x2550;O)&#x2014;NH, and where at least one urea-functional radical Q having a radical Ris present per molecule are prepared by reacting amino-functional organopolysiloxanes comprising units of the formulaR&#x2032;SiO&#x2003;&#x2003;(IV),where A is an amino-functional radical of the formula&#x2014;R&#x2014;[NR&#x2032;&#x2014;R&#x2014;]NR&#x2032;R&#x2003;&#x2003;(V),with the proviso that at least one amino-functional radical A is present per molecule in the organopolysiloxanes made up of units of the formula (III),with ortho-substituted aryl carbamates of the formulaR&#x2014;Ar&#x2014;O&#x2014;C(&#x2550;O)&#x2014;NH&#x2003;&#x2003;(VI),where Ar is an ortho-substituted aryl radical.

Method for preparing urea-functional siloxanes

Polymerizable siloxy-substituted silanes are obtained in high yield and purity by adding a substituted alkoxysilane to a mixture of disiloxane, acetic acid, sulfuric acid, and optionally an acidic catalyst, separating a product phase from an acidic phase, adding hexamethyldisilazane to the product phase and filtering off a resulting salt, followed by distillation.

Method for the production of polymerizable silicones

Siloxy-substituted silane-containing polymerizable silicones are prepared in high purity by metering a substituted alkoxysilane into a mixture of disiloxane, acetic acid, and acid catalyst, adding acetyl chloride, separating an acidic phase from a product phase, and adding hexamethyldisilazane to the product phase, which is then distilled.

Ionic organosilicon compounds comprising siloxane units of the formula

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Burghausen, Germany

Birgit Peschanel