Wacker Chemie Ag

Detlev Ostendorf

Uwe Scheim

Marko Prasse

Daniel Schildbach

Michael Stepp

Peter Schoeley

Steffen Doerrich

Peter Schöley

Steffen DÖRRICH

Hydrosilylative crosslinking compositions containing an aliphatically unsaturated compound which is the reaction product of an alkali metal siliconate and a chlorosilane and a coupler having two silicon bond hydrogen atoms have high compression and damping characteristics when cured.

Crosslinkable organopolysiloxane compositions

A hydrosilylation curable mixture whose cured products have high mechanical damping include a cyclosiloxane bearing aliphatic unsaturation and a coupler having both silicon-bonded hydrogen and at least one aromatic group.

Crosslinkable organosiloxane compositions

Organopolysiloxane mixtures curable by hydrosilylation include MT organopolysiloxanes having 10 to 20 siloxy units and containing a fraction of 0.15 to 0.24 M units based on total siloxy units in the organopolysiloxane, and a polydispersity of 1.05 to 1.40, a hydrosilylation catalyst, and an Si—H-functional organopolysiloxane are curable to vulcanizates with elastic moduli which may be greater than 0.5 GPa.

Curable organopolysiloxane compositions contain (D) fillers and (K) amines, wherein the radicals and indices have the definition specified in claimWhen coarse and fine grained fillers are employed, the composition can be used to mold artificial stone.

Curable organopolysiloxane compositions

Addition curable composition containing specific silicone resins containing aliphatically unsaturated groups and an organic compound containing unsaturated groups such as acrylate or methacrylate groups are suitable when used with fine and coarse fillers to produce artificial stone with both high hardness and high flexural strength.

Synthesis of organyloxyfunctional organosilicon compounds is facilitated by a two-step process using a basic lithium, guanidine or amidine catalyst in the first step, and a phosphorus compound having a P&#x2550;O linkage in a second step.

Process for preparing organosilicon compounds containing organyloxy groups

Artificial stone having excellent mechanical and weatherability properties is prepared from a highly filled crosslinkable organosilicon composition where the filler comprises at least 20 weight percent of coarse fillers, the organosilicon component contains silicon-bonded alkoxy and or hydroxyl groups, with a catalyst containing a metal compound and an amidine or guanidine.

Artificial stone which exhibits minimal visual change when exposed to weathering, UV light, and heat, is prepared by shaping and curing a crosslinkable composition based on crosslinkable organopolysiloxanes as a binder, at least 85% by weight of a filler component, the filler component containing at least 20% by weight of coarse grain mineral filler having grain sizes of 0.2 mm to 10 mm.

Cross-linkable compositions based on organosilicon compounds and thus produced molded bodies

Curable organosilicon compositions with good adhesion to substrates and good workability contain a condensable base organopolysiloxane, a carbamato-alkyl-functional alkoxysilane, and a heterocycle substituted at a heteroatom by an alkoxysilylmethyl group.

Cross-linkable masses based on organosilicon compounds

An artificial stone can be prepared by binding a suitable stone filler with a binder which contains a silicon bonded, hydroxyl-functional silicone resin also optionally bearing silicon bonded alkoxy groups, and an organosilicon compound which is a silane or siloxane bearing silicon bonded alkoxy groups. The artificial stone is resistant to the effects of UV light as well as heat.

Crosslinkable compositions based on organosilicon compounds, more particularly RTV-1 sealants, contain

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Detlev Ostendorf