Preparation of water-insoluble polymers
AssigneeBASF SE
InventorChristian Schade
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Abstract
Water-insoluble polymers are prepared by free radical polymerization of ethylenically unsaturated monomers by a process in which the polymerization is carried out in an aqueous gel phase having a viscosity of at least 800 mPa.s and the gel former has a molecular weight of more than 20,000. The dispersions obtained have a long shelf life and the polymer can be readily precipitated.
Claims17
A process for the preparation of a water-insoluble polymer by free radical emulsion polymerization of at least one ethylenically unsaturated monomer, wherein said ethylenically unsaturated monomer comprises at least one monomer which is substantially water-insoluble and optionally one or more comonomers wherein the polymerization is carried out in an aqueous gel phase having a viscosity of at least 800 mPa.s;
- wherein the gel former has an average molecular weight of more than 20,000;
- and wherein the gel former is an anionic carboxyl-carrying polymer of synthetic origin.
Dependencies are inferred from the claim text.