Silicone rubber formulations with hydrophobic silicas

The invention relates to silicone rubber formulations comprising organopolysiloxanes and hydrophobicized silicas, which possess an extremely high level of whiteness. A silicone rubber formulation containing from 0.5 to 60% by weight of hydrophobic silicas having the following properties: carbon cont...

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Bibliographic Details
Main Authors KEMPF, MICHAEL, PANZ, CHRISTIAN DR, SCHMOLL, RALF DR, SCHOLZ, MARIO DR, SCHACHTELY, UWE
Format Patent
LanguageEnglish
Published 21.06.2004
Edition7
Subjects
BLASTING
CHEMISTRY
COMPOSITIONS BASED THEREON
COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
CYLINDERS
ENGINEERING ELEMENTS AND UNITS
GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS
HEATING
HUMAN NECESSITIES
HYGIENE
LIGHTING
MECHANICAL ENGINEERING
MEDICAL OR VETERINARY SCIENCE
METALLURGY
ORGANIC MACROMOLECULAR COMPOUNDS
PISTONS
PREPARATIONS FOR MEDICAL, DENTAL, OR TOILET PURPOSES
SEALINGS
THEIR PREPARATION OR CHEMICAL WORKING-UP
THERMAL INSULATION IN GENERAL
USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS
WEAPONS
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Summary:The invention relates to silicone rubber formulations comprising organopolysiloxanes and hydrophobicized silicas, which possess an extremely high level of whiteness. A silicone rubber formulation containing from 0.5 to 60% by weight of hydrophobic silicas having the following properties: carbon content >3.1%; methanol wettability >60%; reflectance >94%; BET/CTAB ratio >1 and <3; DBP absorption <230 g/100 g; BET surface area 50-110 m /g; CTAB surface area >30 m /g; water vapor absorption at 30 DEG C and 30 AH <1.3; water vapor absorption at 30 DEG C and 70 AH <1.7 and 30-99.5% by weight of an organopolysiloxane of the formula ZnSiR3-n-O-[SiR2O]x-SiR3-n-Zn, where R=alkyl, alkoxy, aryl, hydroxy, hydride, alkenyl radicals, having from 1 to 50 carbon atoms, unsubstituted or substituted by O, S, F, Cl, Br, I, in each case identical or different, and/or polystyrene, polyvinyl acetate, polyacrylate, polymethacrylate, and polyacrylonitrile radicals having 50-10000 repeating units, Z=H, OH, Cl, Br, amino, amineoxy, alkenyloxy, aryloxy or phosphate radicals, it being possible for the organic radicals to carry up to 20 carbon atoms, in each case identical or different, n=1-3, x=100-15000.
Bibliography:Application Number: TW200291121239