Nanofibrillar cellulose product

Patent metadata

Field	Value
Publication number	US-10626191-B2
Application number	US-201515566824-A
Country	US
Kind code	B2
Filing date	May 4, 2015
Priority date	May 4, 2015
Publication date	Apr 21, 2020
Grant date	Apr 21, 2020

Abstract

The present invention relates to nanofibrillar cellulose. Furthermore, the invention relates to a method for the manufacture of nanofibrillar cellulose, and to a nanofibrillar cellulose obtainable by said method. The invention also relates to uses of the nanofibrillar cellulose.

First claim

The invention claimed is:

1. A nanofibrillar cellulose, wherein said nanofibrillar cellulose is a high pressure mechanically disintegrated nanofibrillar cellulose in the form of a hydrogel or membrane, has an average degree of polymerization greater than 1000, and a storage modulus between 0.3 and 20 Pa, when dispersed to a concentration of 0.5 w % in water, and wherein said nanofibrillar cellulose is of plant origin, delaminated cellulose pulp, wherein the nanofibrillar cellulose has a number average diameter between 2 and 15 nm.

2. The nanofibrillar cellulose according to claim 1 , wherein said nanofibrillar cellulose has an average degree of polymerization greater than 1150.

3. The nanofibrillar cellulose according to claim 1 , wherein said nanofibrillar cellulose is of wood origin.

4. The nanofibrillar cellulose according to claim 1 , wherein said nanofibrillar cellulose is of native cellulose.

5. The nanofibrillar cellulose according to claim 1 , wherein said nanofibrillar cellulose has a turbidity of 200 NTU or less in water at concentration of 0.1 w %.

6. A nanofibrillar cellulose, wherein said nanofibrillar cellulose is a high pressure mechanically disintegrated nanofibrillar cellulose in the form of a hydrogel or membrane, has an average degree of polymerization greater than 1000, and a storage modulus between 0.3 and 20 Pa, when dispersed to a concentration of 0.5 w % in water, and wherein said nanofibrillar cellulose is of plant origin, delaminated cellulose pulp, wherein the crystallinity of the nanofibrillar cellulose is from 60% to 80%.

7. A nanofibrillar cellulose, wherein said nanofibrillar cellulose is a high pressure mechanically disintegrated nanofibrillar cellulose in the form of a hydrogel or membrane, has an average degree of polymerization greater than 1000, and a storage modulus between 0.3 and 20 Pa, when dispersed to a concentration of 0.5 w % in water, and wherein said nanofibrillar cellulose is of plant origin, delaminated cellulose pulp, wherein the nanofibrillar cellulose has a hemicellulose content greater than 10 w %.

8. The nanofibrillar cellulose according to claim 1 , wherein the nanofibrillar cellulose has a number average length between 2 and 20 μm.

9. The nanofibrillar cellulose according to claim 1 , wherein the nanofibrillar cellulose has an average aspect ratio greater than 500.

10. The nanofibrillar cellulose according to claim 1 , wherein the nanofibrillar cellulose has a zero shear viscosity in the range of 100-8 000 Pa·s when dispersed to a concentration of 0.5 w % in water.

11. The nanofibrillar cellulose according to claim 1 , wherein the nanofibrillar cellulose has a loss tangent less than 0.3 when dispersed to a concentration of 0.5 w % in water.

12. A nanofibrillar cellulose, wherein said nanofibrillar cellulose is a high pressure mechanically disintegrated nanofibrillar cellulose in the form of a hydrogel or membrane, has an average degree of polymerization greater than 1000, and a storage modulus between 0.3 and 20 Pa, when dispersed to a concentration of 0.5 w % in water, and wherein said nanofibrillar cellulose is of plant origin, delaminated cellulose pulp, wherein more than 90% by weight of the nanofibrillar cellulose is in the fiber fraction of less than 0.2 mm.

13. A membrane comprising the nanofibrillar cellulose as defined in claim 1 .

14. The nanofibrillar cellulose according to claim 1 for use as a pharmaceutical.

15. The nanofibrillar cellulose according to claim 1 for use in or as a matrix for drug delivery, cell delivery, tissue engineering, wound treatment, or implants, or as a wound healing agent, an anti-inflammatory agent, or a hemostatic agent.

16. A pharmaceutical, cosmetic, food, agrochemical, paint, coating, paper, board, pulp, filter, composite product, adhesive, display, personal care composition, tooth paste, or cell or tissue culture matrix, or cell or tissue delivery matrix comprising the nanofibrillar cellulose as defined in claim 1 .

17. The nanofibrillar cellulose according to claim 1 , wherein the cellulose pulp includes cations, said cations having replaced cations present in native cellulose pulp, the cellulose pulp having a freeness of at least 60° SR (Schopper-Riegler).

Assignees

• Upm Kymmene Corp

Inventors

• Nuopponen Markus

Classifications

• C08B15/02 Primary

  Oxycellulose; Hydrocellulose; {Cellulosehydrate, e.g. microcrystalline cellulose} · CPC title

• D21B1/12

  by wet methods, by the use of steam (beaters D21D1/00) · CPC title

• C08L1/02

  Cellulose; Modified cellulose · CPC title

• A61K31/717

  Celluloses · CPC title

• D21B1/06

  by dry methods · CPC title