Wacker Chemie Ag

Wacker-chemie Gmbh

Juergen Pfeiffer

Torsten Gottschalk-Gaudig

Volker Stanjek

Christoph Briehn

Richard Weidner

Herbert Barthel

Andreas Bauer

Konrad Alfons Wierer

Peter John

Ernst Selbertinger

Robert Maurer

Manfred Hoelzl

Frauke Kirschbaum

Amino group-containing organosilicon compounds containing no or only a small fraction of Si-bonded hydroxyl groups are prepared by preparing an organosilicon compound containing amino groups and Si-bonded hydroxyl groups by equilibration in the presence of an equilibration catalyst, and reacting the resultant product with a cyclic silazane. The products are particularly useful as a monomer or macromere for the preparation of high molecular weight organic polymers containing organosilicon blocks.

Method for producing organosilicon compounds having amino groups

Thin porous moldings of silicone copolymers, suitable for use as membranes in separation processes, are prepared by forming a solution or suspension of silicone copolymer in two solvents L1 and L2, casting the suspension or solution, and removing solvent L1 to form a silicone copolymer rich phase A, effecting structure formation, and then removing solvent L2 and residues of solvent L2 to form a thin porous molding.

Method for producing porous silicon molded bodies

Polyurea/urethane silicone elastomers with improved properties are obtained by addition of solid polyurea/urethane silicone low molecular weight oligomers.

Compositions comprising siloxane copolymers

Particles useful in curable coating systems are functionalized on their surface with a blocked isocyanate functionality. The blocked isocyanate is generated by reacting an organosilane having an oxygen, sulfur or nitrogen atom &#x3b1; to the silyl group, or having a cyclic structure containing N or O in the ring, attached directly to silicon.

Particles with protected isocyanate groups

Coating formulations especially useful for topcoat and clearcoat applications contains an isocyanate-reactive resin, a blocked isocyanate curative, and particles which bear blocked isocyanate functionalities, a considerable portion of which unblock at a temperature lower than the unblocking temperature of the curative. As a result, the coatings exhibit improved scratch resistance.

Coating materials containing particles with protected isocyanate groups

Coating formulations suitable for demanding applications such as automotive clear and top coats contain a hydroxyl-functional film forming resin, an isocyanate or blocked isocyanate curative, and functionalized metal oxide particles, where &#x3e;50% of the reactive functionalities are more reactive towards isocyanates than at least 60% of the hydroxyl groups of the film forming resin. Coatings prepared therefrom have excellent abrasion resistance, even with low filler content.

Paints comprising particles

Unsaturated organosilicon compounds are prepared by the reaction of a halo-functional organosilicon compound with a salt of an unsaturated carboxylic acid in the presence of a tertiary phosphine.

Process for preparing unsaturated organosilicon compounds

A process for preparing a metal oxide having groups of the general formula I&#x2014;O&#x2014;SiR&#x2014;CH&#x2014;Y&#x2003;&#x2003;(I)which involves reacting a solid having OH groups on the surface with silanes of the general formula IIRO&#x2014;SiR&#x2014;CH&#x2014;Y&#x2003;&#x2003;(II)where

Organofunctional surface-modified metal oxides

A process for stabilizing organosilicon compounds bearing unsaturated groups during their preparation, distillation, and/or storage, the organosilicon compounds bearing unsaturated groups having been obtained by reacting a haloalkylsilane with a salt of an unsaturated organic acid, by adding one or more compounds of the formula Iwherein Rand Rare identical or different linear or branched Calkyl, and the radicals Rare identical or different and are hydrogen or linear or branched alkyl radicals having 1-20 carbon atoms.

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Burghausen, Germany

Juergen Pfeiffer