Processing

Please wait...

PATENTSCOPE will be unavailable a few hours for maintenance reason on Tuesday 26.10.2021 at 12:00 PM CEST
Settings

Settings

Goto Application

1. WO2020136656 - NANOCOMPOSITES COMPRISING BIODEGRADABLE POLYMERS AND INORGANIC NANOPARTICLES, METHODS OF PREPARATION AND USES THEREOF

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]

CLAIMS

What is claimed is:

1. A nanocomposite comprising a polymer and an anhydrous MX2 -based fullerene-like nanoparticles or nanotubes; wherein said polymer is selected from poly(lactic acid), poly (lactic -co-glycolic acid) or a combination thereof, M is Mo, W, Ta or Nb; and X is S, Se or Te; wherein the weight percentage of the MX2 -based fullerene-like nanoparticles or nanotubes from the total weight of said nanocomposite is between 0.25% and 3% and the composite has at least one of the following properties: modulus between 1.6-4 GPa; toughness (area below the stress-strain curve) between 1.1-40 MPa/%; static friction coefficient, ps, between 0.055-0.08; kinetic friction coefficient, ps. between 0.02-0.05; yield strength: between 15-75MPa; and friction force reduced by between 10-99% compared to the polymer alone.

2. The nanocomposite of claim 1, wherein said polymer is poly(lactic acid) or poly(lactic-co-glycolic acid).

3. The nanocomposite of claim 2, wherein said poly(lactic acid) is poly(L-lactic acid), poly(D-lactic acid) or poly(DL-lactic acid); or said poly(lactic-co-gly colic acid) is poly(L-lactic-co-glycolic acid), poly(D-lactic-co-glycolic acid) or poly(DL-lactic-co-glycolic acid).

4. The nanocomposite of claim 2 or 3, wherein said poly (lactic acid) has an inherent viscosity of 3.8 or 2.4 dL/g.

5. The nanocomposite according to any one of the preceding claims, wherein said MX2 -based fullerene-like nanoparticles or nanotubes are WS2 or M0S2 fullerene-like nanoparticles or nanotubes.

6. The nanocomposite of claim 5, wherein said MX2 nanotubes are WS2 nanotubes.

7. The nanocomposite according to any one of the preceding claims, wherein said weight percentage of said MX2 -based fullerene-like nanoparticles or nanotubes from said nanocomposite is 0.25; 0.4; 0.5; 0.7; 0.8; 1 ; or 3.

8. A method for the preparation of a nanocomposite, said nanocomposite comprises an anhydrous MX2 -based fullerene-like nanoparticles or nanotubes and a polymer selected from poly(lactic acid), poly (lactic-co-glycolic acid) or a combination thereof, wherein M is Mo, W, Ta or Nb; and X is S, Se or Te; wherein said method comprises:

dissolving the polymer in a first solvent;

dissolving said anhydrous MX2 -based fullerene-like nanoparticles or nanotubes in a second solvent;

mixing together both said solutions;

solvent casting said mixed solution; and

drying the mixed solution to obtain the nanocomposite.

9. The method of claim 8, wherein the polymer is dried prior to its dissolution step.

10. The method of any one of claims 8-9, wherein the drying step of the mixed solution form a film, and said film is further annealed to obtain the nanocomposite.

11. The method of any one of claims 8-10, wherein said method further comprises treating said

MX2 -based fullerene-like nanoparticles or nanotubes with surface -modifying agent before their dissolution in a second solvent.

12. The method of claim 11, wherein said surface-modifying agent is /V-methyl-2-pyrrolidone (NMP), polyethylenimine (PEI), polyethylene glycol (PEG) or cetyltrimethylammonium bromide (CTAB).

13. The method according to any one of claims 8-12, wherein said first solvent or second solvent, each independently is dichloromethane or chloroform.

14. The method according to any one of claimslO-13, wherein said annealing is performed under vacuum and performed for between 1 hour - 14 days.

15. The method according to any one of claims 10-14, wherein said annealing is performed under vacuum at a temperature of between 30 - 160 C.

16. The method of claim 14 or 15, wherein said vacuum annealing is performed for 1 hour at 120 C; for 6 hours at 120 C; for 48 hours at 40 C; or for 7 days at 30 C.

17. A nanocomposite prepared according to the method of any one of claims 8-16.

18. The nanocomposite according to any one of claims 1-7 and 17, for use in 3D printing.

19. A filament for 3D printing comprising a nanocomposite according to any one of claims 1-7 and 17.

20. The filament of claim 19, wherein the filament is processed by Fused Deposition Modeling (FDM) 3D-printer.

21. A medical device or product comprising a nanocomposite according to any one of claims 1-7 and 17.

22. The medical device or product of claim 21, selected from the group consisting of:

medical artificial replacement of tissues comprising: bone, bone cements and joints; patch on the skull; surgical mesh; breast implants; lenses; blood vessels; artificial heart valves; artificial skin; implants; intra uterine devices; shunts; catheters; stents; coating for subcutaneous implants; insulin pumps; contraceptives; pacemakers; tubing and cannulas used for intra venous infusion; tubing and cannulas used for dialysis; surgical drainage tubing; endotracheal tubes; sutures; surgical gloves; tips for ear examination; stethoscope ends and elements used by the medical personnel comprising: tooth brushes, tooth pick, dental floss, interdental and tongue brushes or plasticware for medical and research laboratories.