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US 12,391,851 B2Granted
Adhesive compositions comprising a combination of (I) microfibrillated cellulose and (II) a metal in an oxidation state of II or greater
AssigneeBorregaard AS
InventorsSynnøve Holtan, Katérina Liapis, Steen Jacobsen, Hans Henrik Øvrebø, Jan Berg
Life of this patent
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Abstract
The present invention relates to an adhesive composition comprising, among others, (i) microfibrillated cellulose and (ii) a metal in oxidation state of II or greater. The present invention further relates to uses of such an adhesive composition and to products prepared with such an adhesive composition. Furthermore, the present invention relates to a process for making corrugated paperboards or cardboards, or solid paperboards or cardboards by using such an adhesive composition.
Claims23
Adhesive composition, comprising:
- a) microfibrillated cellulose, wherein the microfibrillated cellulose has a Schopper-Riegler (SR) method value of below 95, as determined according to EN ISO 5267-1 (in the version of 1999), or, in the alternative, cannot be reasonably measured in accordance with the SR method, as fibers of the MFC are so small that a large fraction of the fibers simply pass through a screen as defined in the SR method;
- b) at least one metal in an oxidation state of II or higher;
- c) at least one compound that (a) is capable of polymerizing or has already partly or fully polymerized, and that (b) has at least two groups available for hydrogen bonding that are capable of crosslinking with at least one functional group of the microfibrillated cellulose and/or the at least one metal in an oxidation state of II or higher;
- d) at least one solvent,
- wherein a relative amount of the at least one metal in an oxidation state of II or higher complies with at least one of the following:
- (i) an amount of moles of the at least one metal in an oxidation state of II or higher, relative to a weight, in kg, of an overall adhesive composition, including solvent, is from 0.0005 to 5;
- (ii) an amount of moles of the at least one metal in an oxidation state of II or higher, relative to a weight of dry mass of the at least one compound that (a) is capable of polymerizing or has already partly or fully polymerized, and that (b) has at least two groups available for hydrogen bonding that are capable of crosslinking with at least one functional group of the microfibrillated cellulose and/or the at least one metal in an oxidation state of II or higher, in kg, is from 0.002 to 20;
- (iii) the at least one metal in an oxidation state of II or higher is present as an oxide, hydroxide or oxyhydroxide, or any mixture thereof, and a weight percentage of said oxide, hydroxide or oxyhydroxide relative to a weight of an overall adhesive composition, including solvent, is from 0.001 to 3.
5 more elements
Dependencies are inferred from the claim text.