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AssigneeRoquette Freres
InventorsSolène BOCK, Vincent WIATZ, Thomas GUGLIELMETTI, Joffrey ATTARD
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The present invention concerns a method for modifying a polysaccharide material, preferably an amylaceous material, involving a first step of homogeneous solubilisation of said polysaccharide material in an aqueous solvent, followed by a step of homogeneous chemical functionalisation comprising at least one non-crosslinking chemical modification, or at least one crosslinking chemical modification, or a sequence of at least one non-crosslinking chemical modification and at least one crosslinking chemical modification. Secondly, the present invention concerns a modified polysaccharide material, in particular obtained by the method according to the invention, characterised in that it has a novel distribution of the chemical substituents attached to the hydroxyl functions of the anhydroglucose units of said polysaccharide material. The novel starches can be used as organic adjuvants for dry mortars made from cement or made from gypsum, in particular as a binder for a dry mortar made from cement or as a thickening agent for a mortar made from plaster.
A modified polysaccharide material including anhydroglucose units, preferentially a modified starch, which is totally water-soluble, the hydroxyl functions of said anhydroglucose units being substituted with at least one hydroxyalkyl chemical group and characterized in that the hydroxyalkyl groups substituting the hydroxyl functions are distributed in the following manner:
The modified polysaccharide material as claimed in claim characterized in that the hydroxyalkyl group is a hydroxypropyl group, and characterized in that its degree of hydroxypropyl substitution is between 0.05 and 2, preferentially between 0.1 and 1 and most preferentially between 0.15 and 0.6.
Dependencies are inferred from the claim text.