Porous polymethylsilsesquioxane with adsorbent properties
AssigneeFirmenich SA
InventorHubert Mimoun
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Abstract
The present application describes a porous polymethylsilsesquioxane (PMS) having a specific surface area between approximately 50 m2/g and 500 m2/g, a pore volume between approximately 0.1 cm3/g and 0.8 cm3/g, a monolayer volume between approximately 10 cm3/g and 60 cm3/g, a pore radius smaller than 1 nm for 90% of the pores and insolubility in water and organic solvents. The PMS according to the invention is prepared by precipitation of a polymethylsiliconate of the general formula in which n is a whole number between approximately 20 and 100 and M is an alkaline metal or alkaline-earth metal or NH4+.
Claims21
A porous polymethylsilsesquioxane in powdered form containing the units
- and having a specific surface area between approximately 50 m2/g and 500 m2/g and a pore radius smaller than 1 nm for 90% of the pores, wherein the polymethylsilsesquioxane is insoluble in water and organic solvents.
A process for the preparation of a porous polymethylsilsesquioxane in powdered form, the process comprising the precipitation, by means of an acid, of an aqueous solution containing a polymethylsiliconate of the general formula
- in which n is a whole number between approximately 20 and 100 and M is an alkaline metal or alkaline-earth metal or NH4+.
Dependencies are inferred from the claim text.