Water-dispersible polysaccharide derivatives of reduced glyoxal content, and a process for decreasing the glyoxal content in glyoxal-crosslinked polysaccharide derivatives
OwnerMeinolf Brackhagen, Hartwig Schlesigerinventors
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Abstract
A description is given of glyoxal-treated polysaccharide derivatives which, to decrease the unbound glyoxal, are treated with an aqueous solution of one or more water-soluble aluminium salts, or one or more water-soluble borates, or a combination of one or more water-soluble aluminium salts and one or more water-soluble borates, and, if appropriate, with suitable buffer substances to set the pH, and then dried. A description is likewise given of a process for decreasing the content of unbound glyoxal in glyoxal-treated polysaccharide derivatives.
Claims10
Glyoxal-treated polysaccharide derivatives, characterized by decrease in the amount of unbound glyoxal, wherein the glyoxal treated polysaccharide derivatives are treated with an aqueous solution of one or more water-soluble aluminium salts, or one or more water-soluble borates, or a combination of one or more water-soluble aluminium salts and one or more water-soluble borates and, optionally, with suitable buffer substances to set pH of the glyoxal treated polysaccharide derivative, and dried.
Process for decreasing the unbound glyoxal in glyoxal-treated polysaccharide derivatives, comprising:
- a) mixing the polysaccharide derivative at a temperature between 20 and 70° C. with an aqueous solution of one or more water-soluble aluminium salts, or one or more water-soluble borates, or a combination of one or more aluminium salts and one or more water-soluble borates, wherein the resulting mixture optionally contains further buffer substances to set the pH, and then
- b) drying the mixture.
Dependencies are inferred from the claim text.