Process for preparing branched Si-H functional polysiloxanes and use thereof for preparing liquid SiC- or SiOC-linked, branched modified organomodified polysiloxanes

US8138294B2 · kind B2 · utility

Assignee

• EVONIK GOLDSCHMIDT GMBH · DE

Inventors

• Frauke Henning · Essen, DE
• Wilfried Knott · Essen, DE
• Michael Ferenz · Essen, DE

Key dates

• Filing date: Aug 25, 2009
• Grant date: Mar 20, 2012
• Expiry date: Jan 19, 2030

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G77/12
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention provides a process for preparing liquid, branched SiH-functional siloxanes by reacting a mixture of one or more low molecular weight SiH-functional siloxanes, one or more low molecular weight SiH-free siloxanes, one or more tetraalkoxysilanes, and optionally one or more trialkoxysilanes with addition of water and in the presence of a Brønsted-acidic ion exchanger, which is characterized in that the reaction is performed in one process step.