US 12,697,803 B2Granted

Composite materials

AssigneeUniversity of Leeds

InventorsPeter John Hine, Michael Edward Ries

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Abstract

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.

Claims6

Dependent claims

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.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/260,958Filed 18 Jul 2019
Priority: GB 181180819 Jul 2018
Published: US 2021/0323282 A121 Oct 2021
Granted: 4 Aug 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification14 codes

B32B 23/10
Layered products comprising a layer of cellulosic plastic substances , i.e. substances obtained by chemical modification of cellulose, e.g.…: next…
B31F 1/0077
Mechanical deformation without removing material, e.g. in combination with laminating: shaping by methods analogous to moulding, e.g. deep drawing…
B31F 1/36
Mechanical deformation without removing material, e.g. in combination with laminating: moistening and heating webs to facilitate mechanical…
B32B 5/02
Layered products characterised by the non- homogeneity or physical structure , i.e. comprising a fibrous, filamentary, particulate or foam…