Traitement en cours

Veuillez attendre...

Paramétrages

Paramétrages

Aller à Demande

1. WO2019123405 - FILM MULTICOUCHE COMPRENANT DE LA CELLULOSE MICROFIBRILLÉE

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

Claims

1. An oxygen barrier film comprising

- a first layer (1 ) comprising at least 80 % by weight of microfibrillated cellulose,

- a second layer (2) comprising polymers, and

- a third layer (3) comprising at least 40 % by weight of chemically modified microfibrillated cellulose.

2. An oxygen barrier film according to claim 1 , wherein the second layer (2) further comprises pigments.

3. An oxygen barrier film according to anyone of claims 1 or 2, wherein the film has a basis weight of less than 50 g/m2 and an Oxygen

Transmission Rate (OTR) value of below 10 ml/m2/per 24h, preferably below 5 ml/m2/per 24h, at 23 QC, at 50% RH.

4. An oxygen barrier film according to any one of claims 1 - 3, wherein said film exhibits an OTR value of below 20 ml/m2per 24h, at 23 QC at 80 % RH.

5. An oxygen barrier film according to any one of claims 1 - 4, wherein said film exhibits an OTR value of below 100 ml/m2per 20h, at 38 QC at 90 % RH.

6. An oxygen barrier film according to any one of claims 1 - 5, wherein said third layer further comprises at least 10 % by weight of unmodified microfibrillated cellulose.

7. An oxygen barrier film according to any one of claims 1 - 6, wherein the chemically modified microfibrillated cellulose is dialdehyde

microfibrillated cellulose (DA-MFC)

8. An oxygen barrier film according to any one of claims 1 - 7, wherein the film further comprise:

- a fourth layer (4) comprising a polymer and optionally pigments, and

- a fifth layer (5) comprising at least 80 wt% microfibrillated

cellulose.

9. An oxygen barrier film according to any one of claims 1 - 8, wherein said polymer in the second and optional fourth layer is chosen from the group consisting of polyvinyl alcohol (PVOH), latex, CMC, starch, guar gum and/or waxes.

10. An oxygen barrier film according to any one of claims 1 - 9, wherein the second layer (2) comprises pigments and wherein said pigments are nanopigments.

1 1. An oxygen barrier film according to claim 10, wherein the nanopigments are platy.

12. A method of manufacturing a film according to any one claims 1 - 1 1 , comprising the steps of

a) forming a first layer comprising microfibrillated cellulose b) forming a second layer comprising a polymer and optionally pigments on one side of said first layer

c) forming a third layer comprising chemically modified microfibrillated cellulose on said second layer

13. A method according to claim 12, wherein the method further comprising the steps of

d) forming a fourth layer comprising a polymer and optionally pigments on the opposite side of said first layer

e) forming a fifth layer comprising MFC on said fourth layer.

14. A method according to any one of claims 12 and 13, wherein the layers are formed by cast forming and/or by spraying.