Abstract: A process for preparing a crosslinked polysaccharide includes preparing a water-polar solvent mixture; dispersing at least one polysaccharide in the water-polar solvent mixture to obtain a reaction medium; adjusting a pH of the reaction medium; crosslinking the at least one polysaccharide by adding, to the basic reaction medium, a phosphate crosslinking agent selected from the group consisting of sodium trimetaphosphate (STMP), sodium tripolyphosphate (STPP), and combinations thereof to obtain a basic dispersion comprising at least one crosslinked polysaccharide; adjusting a pH of the basic dispersion to a value less than or equal to 7.0 to obtain a non-basic dispersion of the at least one crosslinked polysaccharide; and filtering the non-basic dispersion obtained at the end of step e) to recover therefrom the at least one crosslinked polysaccharide.

Abstract: Linear or crosslinked copolymers consist of monomer units derived from Tulipalin A and from itaconic acid are present at a molar ratio RA, having as numerator a number of moles of monomer units derived from the compound of formula (I) and as denominator a number of moles of monomer units derived from the compound of formula (II), that is greater than or equal to 0.4 and less than or equal to 3.0. A process for preparing the linear or crosslinked polymer, its use in dermocosmetics or dermopharmacy, and to topical formulations including the linear or crosslinked polymer are also described.