US 7,932,329 B2 · Use of alkali metal-silica gel (M-SG) materials in solvent and monomer drying and purification for their use in anionic polymerization

Abstract

Stage I Group 1 metal/porous metal oxide compositions or Stage II Group 1 metal/porous metal oxide compositions are shown to be useful to remove impurities and act as drying agents for various types of solvents and for olefinic monomers used in anionic polymerizations. One important advantage of these compositions is their ability to dry simultaneously solvent and monomers, without inducing a significant polymerization of the latter. Another important characteristic is the capacity of the compositions to be totally inactive toward conventional anionic polymerization which allows them to be left in situ during the polymerization itself.

Claims23

Dependent claims

A method for removing impurities from solvents or monomers, comprising the step of contacting a solvent, a liquid monomer, or a solvent-monomer mixture with a Stage I Group 1 metal/porous metal oxide composition or a Stage II Group 1 metal/porous metal oxide composition,

wherein the porous metal oxide in the Stage II Group 1 metal/porous metal oxide composition contains silicon.

Dependencies are inferred from the claim text.

Facts

Application

12/239,296Filed 26 Sep 2008 · us provisional application

Priority

28 Sep 2007

Published

US 2009/0105430 A123 Apr 2009

Granted

26 Apr 2011

Term ends

Not estimatedThe source records don’t support an estimate.

Classification10 codes

C07C 7/12
Purification; Separation; Use of additives: by adsorption, i.e. purification or separation of hydrocarbons with the aid of solids, e.g. with…
C07C 7/14841
With metals or their inorganic compounds: metals
C08F 4/025
Carriers therefor: metal oxides
C08F 4/463
Selected from alkali metals: selected from sodium or potassium

Use of alkali metal-silica gel (M-SG) materials in solvent and monomer drying and purification for their use in anionic polymerization

Life of this patent

Use of alkali metal-silica gel (M-SG) materials in solvent and monomer drying and purification for their use in anionic polymerization

Life of this patent

Abstract

Claims23