Process for the preparation of poly(diorganosiloxanes) with alkoxy end groups

US4705826A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Wilhelm Weber · Neustadt, DE
• Karl-Heinz Sockel · Leverkusen, DE
• Theo Achtenberg · Leverkusen, DE
• Hans Sattlegger · Odenthal, DE

Key dates

• Filing date: Jun 11, 1986
• Grant date: Nov 10, 1987
• Expiry date: Jun 11, 2006

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G77/08
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for the preparation of triorganooxysilyl- or diorganooxyorganosilyl-terminated poly(diorganosiloxanes) or formulations containing such siloxanes comprising reacting .alpha.,.omega.-dihydroxypoly(diorganosiloxanes) with tetraorganyloxysilanes or triorganyloxyorganosilanes in the presence of an ammonium carbamate catalyst of the formula I ##STR1## wherein, R represents a hydrocarbon radical with 1-20 C atoms or an H atom, and where identical or different R radicals are in the molecule. The products produced by this process can be employed in the preparation of one-component silicone paste which harden into elastomers in the presence of moisture.