Composite materials
The invention relates to a composite material comprising cellulose. The composite material comprises a first cellulose-based material, which may be a textile or fabric, and a second cellulose-based material, which may be a film or cellulose based material or powdered cellulose-based material. The second cellulose-based material may be a sheet material comprising cellulose, such as a paper or a regenerated cellulose film. In embodiments the material is a so called “all cellulose composite” where both of the materials that are brought together are different forms of material comprising or being cellulose. For example, the different materials originate from cellulose-based feedstocks. The invention also relates to a process for preparing the composite materials of the invention utilising ionic liquids.
1 . An all-cellulose composite material, comprising a first cellulose-based material and a second cellulose-based material, wherein the first cellulose-based material and the second cellulose-based material are alternately layered with one another such that there are at least two layers of either the first or second cellulose-based material and at least one layer of the other cellulose-based material;
wherein the first cellulose-based material is a textile;
wherein the second cellulose-based material is a sheet of filter paper or a cellophane film;
wherein the all-cellulose composite material further comprises an alloy region, wherein the alloy region is a region comprising material of both the first cellulose-based material and the second cellulose-based material; and
wherein the cellulose comprises:
from about 10% to about 90% cellulose type 1;
from about 10% to about 50% amorphous cellulose; and
from about 2% to about 45% regenerated cellulose and/or cellulose II.
2 . The all-cellulose composite material of claim 1 , wherein the all-cellulose composite material has from 3 to 100 layers in total of the first cellulose-based material and the second cellulose-based material.
3 . The all-cellulose composite material of claim 1 , wherein the cellulose comprises:
from about 40% to about 60% cellulose type 1;
from about 25% to about 38% amorphous cellulose; and
from about 2% to about 45% regenerated cellulose and/or cellulose II.
4 . The all-cellulose composite material of claim 1 , wherein the all-cellulose composite material has a peel strength of at least 50 N/m.
5 . The all-cellulose composite material of claim 1 , wherein the first cellulose-based material is selected from: cotton, flax, jute, hemp, ramie, sisal, bamboo, rayon, Tencel, Ioncell, and lyocell.
6 . The all-cellulose composite material of claim 1 , wherein the second cellulose-based material is a cellophane film.