Polysaccharide-based superabsorbent film
AssigneeSCA Hygiene Products AB
InventorsGuiseppe Mensitieri, Fabrizio Porro, Luigi Nicolais, Alessandro Sannino
Life of this patent
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Abstract
A superabsorbent polysaccharide can be obtained by crosslinking a polysaccharide or derivative thereof with at least 1% by weight of a flexible spacer having a chain length of at least 9 chain atoms and having terminal activated coupling groups. The flexible spacer may comprise a polyalkyleneglycol with a molecular weight from about 400 to 10,000. The coupling groups may be provided by divinyl sulphone units.
Claims20
A process for producing a crosslinked flexible superabsorbent polysaccharide, comprising reacting a polyalkyleneglycol with at least two equivalents of a reagent containing one or more activated double bonds selected from the group consisting of divinyl sulphone, maleic anhydride, dichloroacetone, 1,3-dichloro-2-propanol, dimethylolurea, dimethylolimidazolidone, diexpoides, epichlorohydrin, diisocyanates, bis(2-hydroxyethyl) sulphone, formaldehyde, and glyoxal, to form a crosslinking spacer having a chain length of at least 9 chain atoms and having terminal activated coupling groups and reacting at least 1% by weight of the crosslinking spacer with a polysaceharide or a derivative thereof selected from the group consisting of carboxymethyl, alkyl, hydroxyethyl and hydroxypropyl derivatives in the presence of a catalyst.
A process for producing a crosslinked flexible superabsorbent polysaccharide comprising reacting a spacer selected from the group consisting of polyalkyleneglycol, polyalkylene, decamethylene diisocyanate, polyhydroxyalkylene, polyalkylene succinate, and polylactide with at least two equivalents of a reagent containing one or more activated double bonds to form a crosslinking spacer having a chain length of at least 9 chain atoms and having terminal activated coupling groups selected from the group consisting of acrylol groups, maleoyl groups, and vinylsulphonyl groups and reacting at least 1% by weight of the crosslinking spacer with a polysaccharide or a derivative thereof selected from the group consisting of carboxymethyl, alkyl, hydroxyethyl and hydroxypropyl derivatives in the presence of a catalyst.
Dependencies are inferred from the claim text.