Wacker Chemie Ag

Markus Jandke

Birgit Peschanel

Florian Koopmann

Eckhard Hanelt

Werner Brennenstuhl

Thilo Gebhard

Pt-catalyzed, addition-crosslinking silicone compositions which are self-adhesive at room temperature, develop adhesion rapidly on unpretreated substrates, and contain a functional alkoxy &#x3b1;-silane as an adhesion promoter.

Pt-catalyzed, addition-crosslinking silicone compositions self-adhesive at room temperature

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.

A mixture which is polymerizable to polymers exhibiting a high optical anisotropy which is stable during polymerization. The mixture contains a first monomer or (and/or) oligomer having two or more polymerizable functional groups and optionally a mesogenic group; a second monomer or oligomer bearing at least one mesogenic group having an aromatic double ring structure and only one polymerizable group; and from 1 to 50% by weight of a monomer non-polymerizable with the first or second monomer, but which also contains a mesogenic group having an aromatic double ring structure.

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Burgkirchen, Germany

Markus Jandke