Polymer gels, method of preparation and uses thereof
AssigneeRhodia Acetow GmbH
InventorsGuainumbi Medeiros, Renata Brito
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Abstract
The invention relates to a method for the preparation of a polymer gel, comprising cross-linking a polymer by using a cyclic dianhydride of carboxylic acid as cross-linking agent and treating the polymer gel with bicarbonate. The invention further concerns the polymer gel obtainable by the method of the invention and the uses thereof in various applications.
Claims17
A method for preparing a polymer gel, the method comprising:
- (a0) adding a cyclic monoanhydride to a first solution comprising a first polymer comprising hydroxyl groups, in the presence of a first catalyst,
- wherein the polymer comprising hydroxyl groups is selected from the group consisting of polysaccharides and derivatives thereof,
- (a) adding a cyclic dianhydride to a second solution comprising a second polymer comprising hydroxyl groups in the presence of a second catalyst,
- (b) maintaining the solution of step (a) under conditions suitable for cross-linking of the second polymer comprising hydroxyl groups by the cyclic dianhydride;
- thereby forming a polymer gel, and
- (c) treating the polymer gel with an aqueous solution of bicarbonate.
A polymer gel comprising a polymer matrix comprising polymeric chains wearing hydroxyl pending groups, a first portion of said hydroxyl pending groups being substituted by a divalent hydrocarbon group crosslinking the polymeric chains to one another, a second portion of said hydroxyl pending groups being substituted by a monovalent hydrocarbon group, said divalent hydrocarbon group wearing a polar function COOH or a salt thereof.
Dependencies are inferred from the claim text.