Cellulose derivatives

Details Cellulose derivatives Cellulose derivatives

C - Chemistry, Metallurgy

08

B

C08B 15/04 (2006.01) A61L 15/28 (2006.01) A61L 26/00 (2006.01) C08B 31/18 (2006.01) C08B 37/00 (2006.01)

Patent

CA 2279649

Stable microdispersed polyanhydroglucuronic acid and salts thereof contain in their polymeric chain from 8 to 30 per cent by weight of carboxyl groups, at least 80 per cent by weight of these groups being of the uronic type, at most 5 per cent by weight of carbonyl groups including intra- and inter-molecular 2,6 and 3,6 hemiacetals, 2,4-hemialdals and C2-C3 aldehydes. The molecular mass of the polymeric chain is from 1 × 10 3 to 3 × 10 5 Daltons. The microdispersed products are prepared by subjecting a polyanhydroglucuronic acid-containing material to partial or complete hydrolysis and neutralisation in an oxidative environment.

L'invention concerne un acide polyanhydroglucuronique microdispersé stable et des sels de celui-ci, qui contiennent, dans leur chaîne polymère, 8 à 30 % en poids de groupes carboxyle, au moins 80 % en poids de ces groupes étant du type uronique, au maximum 5 % en poids de groupes carbonyle pouvant être des 2,6 et 3,6 hémiacétals, 2,4 hémialdals intra et intermoléculaires, et des aldéhydes C2-C3. La masse moléculaire de la chaîne polymère est comprise entre 1 x 10<3> et 3 x 10<5> Daltons. Les produits microdispersés sont préparés par hydrolyse partielle ou complète d'un matériau contenant de l'acide polyanhydroglucuronique et neutralisation dans un milieu oxydant.

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