Patent ID: 7049434

Claim:
Derivatives of hyaluronan, wherein the hydroxyl groups are carbamoylated in amounts ranging from 0.01% to 100% and the carboxyl groups are esterified in amounts of at least 50% with alcohols or they are in the form of salts, wherein the hydroxyl groups are carbamoylated with an isocyanate selected from the group consisting of alkyl isocyanates; alkylaryl isocyanates, and aryl isocyanate; wherein said isocyanate is optionally substituted; wherein said alkyl residue is a linear or branched, saturated or unsaturated C2–C6 alkyl, and wherein the aryl residue is mono- or polynuclear, optionally substituted with a residue selected from the group consisting of linear or branched, saturated or unsaturated C1–C5 alkyls, with halogens, nitro groups, cyano groups, and methoxy groups.