Abstract: Silicone elastomers exhibiting high breakdown voltage and improved static decay characteristics are prepared from a crosslinkable silicone composition containing an ethylenically unsaturated polyoxyalkylene polyether which becomes chemically bonded into the elastomer during cure.

Abstract: Silicone elastomers exhibiting high breakdown voltage and improved static decay characteristics are prepared from a crosslinkable silicone composition containing an ethylenically unsaturated polyoxyalkylene polyether which becomes chemically bonded into the elastomer during cure.

Abstract: Organopolysiloxane composition (O) curable to vulcanizates having relative permittivity ?r of at least 6, measured by IEC 60250, and onset temperature greater than 80° C., including: (A) 100 pbw of compounds having radicals with aliphatic carbon-carbon multiple bonds, (B) 0.1-50 pbw of organopolysiloxanes with Si-bonded hydrogen atoms or, instead of (A) and (B), (C) 100 pbw of organopolysiloxanes having SiC-bonded radicals with aliphatic carbon-carbon multiple bonds and Si-bonded hydrogen atoms, (D) 10-100 pbw of mineral reinforcing filler with BET surface area of at least 50 m2/g by DIN-EN-ISO 9277, (E) 4-300 pbw of carbon black with BET surface area of 5-1100 m2/g by ASTM D-6556 and with OAN of 10-500 ml/100 g by ASTM D-2414, and (F) thermally activatable catalyst containing compounds of the platinum metals selected from Pt, Pa, Rh and Ru, in such an amount that 0.0000001-0.01 pbw of platinum metal is present in the organopolysiloxane composition (O).

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.

Abstract: Compositions prepared by mixing