Curable organopolysiloxane compositions

US6566430B2 · kind B2 · utility

Assignee

• Wacker Chemie AG · DE

Inventors

• Stefan Dietl · Burghausen, DE
• Walter Strassberger · Altötting, DE
• Anita Kaltenberger · Burghausen, DE
• Mathias Miedl · Polling, DE
• Philipp Mueller · Waldshut-Tiengen, DE

Key dates

• Filing date: Dec 10, 2001
• Grant date: May 20, 2003
• Expiry date: Dec 10, 2021

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G77/20
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Compositions prepared by mixing(A) 50-90 wt % of organopolysiloxane having a viscosity of from 50 to 100·106 mm2/s at 25° C.,(B) 10-50 wt % of a metal oxide from the group consisting of titanium oxide, zirconium dioxide, zinc oxide, cerium(III) and cerium(IV) oxide,(C) 0.3-5 wt % of organosilicon compound containing basic nitrogen bound to silicon via carbon,(D) 0.05-0.5 wt % of platinum calculated as the element, in the form of a bis(alkynyl)platinum complex which additionally includes donor ligands, and(E) from 0 to 5 wt %, preferably 0 wt %, of further components, the sum of the percentages chosen within each of the ranges specified under (A) to (E) being 100 wt %, and the wt % in each case being based on the total weight of the additive, are highly suitable as additives to crosslinkable organosilicon compositions, providing one or more of improved tracking resistance, high arc resistance, and decreased flammability.