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US 2003/0144404 A1Published application
High-whiteness hydrophobic preciptated silica with ultralow moisture absorption
AssigneeDegussa AG
InventorsUwe Schachtely, Christian Panz, Ralf Schmoll
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Abstract
The invention relates to hydrophobicized precipitated silicas that possess an extremely high whiteness and extremely low moisture absorption. The hydrophobic precipitated silicas are prepared, inter alia, by coating with silicone oil and oxidative heat treatment.
Claims29
A hydrophobic precipitated silica having the following properties:
- 17 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 m2/g;
- CTAB surface area >30 m2/g;
- water vapor absorption at 30° C. and 30% relative 1.1 ± 0.2%;
- and humidity water vapor absorption at 30° C. and 70% relative 1.4 ± 0.3%. humidity
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A process for preparing hydrophobic precipitated silica, the process comprising:
- a) preparing a mixture of an organopolysiloxane derivative and a precipitated silica;
- b) conditioning the mixture at from 10 to 1 50° C. for a period of from 0.5 to 72 hours;
- and
- c) conducting oxidative heat treatment at more than 300° C. with an oxidizing gas.
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Dependencies are inferred from the claim text.