Cross-linked polymer of carbohydrate, notably based on polysaccharides, and/or on oligosaccharides and/or on polyols
View Patent ↗The invention discloses a cross-linked polymer of at least one carbohydrate component comprising at least one primary alcohol function in particular for the manufacture of a composition which is intended to be applied onto the skin to obtain a tensing and/or toning effect.
1. A method for manufacturing a cross-linked polymer, comprising cross-linking in a homogenous aqueous phase at least one primary alcohol functional group of xanthan with at least one reactive functional group of sebacic acid dichloride to obtain a cross-linked polymer, wherein the molar ratio of xanthan with respect to sebacic acid dichloride in the homogenous aqueous phase is less than 0.1.
2. The method of claim 1 , wherein the molar ratio of xanthan with respect to sebacic acid dichloride in the homogenous aqueous phase is less than 0.01.
3. The method of claim 1 , further comprising hydrolyzing said xanthan prior to the cross-linking reaction with sebacic acid dichloride.
4. The method of claim 1 , further comprising removing compounds which are insoluble in the aqueous phase after the cross-linking reaction.
5. A method for manufacturing a cross-linked polymer, comprising (1) dissolving xanthan in an aqueous phase to form a xanthan solution, and (2) admixing the xanthan solution of (1) with a phase comprising sebacic acid dichloride to form a homogenous aqueous phase for a period of time sufficient to obtain a cross-linked polymer having a molecular weight of at least 50,000 Daltons, wherein the molar ratio of xanthan with respect to sebacic acid dichloride in the homogenous aqueous phase is less than 0.1.
6. A cross-linked polymer, other than a cross-linked polymer obtained by interfacial polymerization in an emulsion for the manufacture of spheres and capsules, prepared by cross-linking the primary alcohol functional groups of xanthan with sebacic acid dichloride in a homogenous aqueous phase, wherein the molar ratio of xanthan with respect to sebacic acid dichloride in the homogenous aqueous phase is less than 0.1.
7. A cross-linked polymer prepared by (1) dissolving xanthan in an aqueous phase to form a xanthan solution, (2) admixing the xanthan solution of (1) with a phase comprising sebacic acid dichloride to form a homogenous aqueous phase for a period of time sufficient to obtain a cross-linked polymer having a molecular weight of at least 50,000 Daltons, wherein the molar ratio of xanthan with respect to sebacic acid dichloride in the homogenous aqueous phase is less than 0.1.
8. A composition selected from the group consisting of a cosmetic composition, a dermo-pharmaceutical composition, and a pharmaceutical composition, wherein said composition comprises an aqueous solution of the cross-linked polymer of claim 6 .
9. A method of cosmetic care selected from the group consisting of tensing skin, toning skin, obtaining a reduction of wrinkles, obtaining small wrinkles, and improving the biomechanical properties of the skin, comprising applying onto the skin the cross-linked polymer as defined in claim 6 .
10. The method according to claim 9 , wherein the cosmetic care is performed on at least one part selected from the group consisting of face, neck, hands and neckline.
11. A method of cosmetic care selected from the group consisting of tensing skin, toning skin, obtaining a reduction of wrinkles, obtaining small wrinkles, and improving the biomechanical properties of the skin, comprising applying onto the skin the cross-linked polymer as defined in claim 7 .
12. The method according to claim 11 , wherein the cosmetic care is performed on at least one part selected from the group consisting of face, neck, hands and neckline.
13. A method of cosmetic care comprising topically applying a cosmetic composition comprising the cross-linked polymer as defined in claim 6 .
14. A method of cosmetic care comprising topically applying a cosmetic composition comprising the cross-linked polymer as defined in claim 7 .
15. The cross-linked polymer of claim 6 , wherein the molar ratio of xanthan with respect to sebacic acid dichloride in the homogenous aqueous phase is less than 0.01.
16. The cross-linked polymer of claim 7 , wherein the molar ratio of xanthan with respect to sebacic acid dichloride in the homogenous aqueous phase is less than 0.01.
17. The method of claim 5 , wherein the molar ratio of xanthan with respect to sebacic acid dichloride in the homogenous aqueous phase is less than 0.01.
18. The method of claim 5 , further comprising hydrolyzing said xanthan prior to the cross-linking reaction with sebacic acid dichloride.
19. The method of claim 5 , further comprising removing compounds which are insoluble in the aqueous phase after the cross-linking reaction.