Wacker Chemie Ag

Jian Nie

Lei Yang

Torsten Sixt

Minlong Xi

Junnan Wu

One-part room-temperature curable compositions (RTV-1 compositions) based on organosilicon compounds are less toxic compared to conventional compositions containing organotin compounds and, at the same time, have excellent curing properties, a skin formation time which allows proper handling and tooling, and excellent storage stability. The compositions contain: at least one organosilicon compound containing condensable groups; at least one curing agent having the formula R'Si(OOCR&#x2033;), wherein R&#x2032; is C-Calkyl, and R&#x2033; is C-Calkyl; at least one organotitanium compound curing catalyst; and at least one filler.

One-part room-temperature curable compositions on the basis of organosilicon compounds and titanium curing catalysts

A polysiloxane composition which is curable by condensation, contains at least one hydroxyl-terminated polyorganosiloxane, at least one diacetoxysilane optionally bearing an alkoxy group, at least one multifunctional alkoxysilane, at least one filler, and at least one catalyst.

Polysiloxane composition

Viscosity peaking during initial formulation of condensation curing compositions employing silanol-functional organopolysiloxanes and alkoxysilanes is avoided by employing specific titanium compounds. A curing catalyst which may be a titanium compound or a tin compound may be added following disappearance of silanol functionality.

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Jian Nie