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US 4,963,666 AGranted
Material of polysaccharides containing carboxyl groups, and a process for producing such polysaccharides
AssigneePharmacia Corporation
InventorTomas Malson
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Abstract
Method of crosslinking carboxyl-containing polysaccharides in that the polysaccharide is at first activated with a bi- or polyfunctional reagent, and then after removal of any potential excess of activating reagent the crosslinking is performed during drying. The invention also comprises a material produced according to this method.
Claims7
A process for the production of crosslinked polysaccharides containing carboxyl groups which comprises
- (a) in a first step contacting a polysaccharide containing carboxyl groups with a bi- or polyfunctional epoxide so as to obtain epoxy-activation of said polysaccharide without crosslinking of said polysaccharide,
- (b) in a second step removing any epoxide that is not bound to said activated but uncrosslinked polysaccharide, and
- (c) in a third step subjecting the activated but uncrosslinked polysaccharide of step (b) to drying conditions until said epoxy-activated polysaccharides do become crosslinked.
Dependencies are inferred from the claim text.