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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Main Authors | , , , , |
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Format | Patent |
Language | English |
Published |
21.06.2004
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Edition | 7 |
Subjects | |
Online Access | Get full text |
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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. |
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Bibliography: | Application Number: TW200291121239 |