Functionalization and reinforcement in the dry state and in the wet state of a cellulosic material by an oxidized polysaccharide

Patent metadata

Field	Value
Publication number	US-12162963-B2
Application number	US-201917273842-A
Country	US
Kind code	B2
Filing date	Sep 5, 2019
Priority date	Sep 7, 2018
Publication date	Dec 10, 2024
Grant date	Dec 10, 2024

Abstract

Disclosed are compounds, in particular based on polysaccharides, that are adsorbed on a cellulosic material, and relates in particular to the application of such compounds as reinforcing agent for cellulosic materials, in the wet and/or dry state. The compounds include a combination of at least one polysaccharide adsorbed on a cellulosic material, the polysaccharide including at least two different monosaccharide units, forming first and second monosaccharide units, the second monosaccharide units being branched on a chain including at least the first monosaccharide units, at least some of the second monosaccharide units being non-cyclic and bearing aldehyde functions, the aldehyde functions possibly forming hemiacetal functions with hydroxy functions of the cellulosic material.

First claim

The invention claimed is:

1. A compound comprising an association of at least one polysaccharide adsorbed on a cellulosic material, said polysaccharide being an oxidized xyloglucan comprising at least two different monosaccharide units, forming first and second monosaccharide units, said second monosaccharide units being branched on a chain comprising at least said first monosaccharide units, at least some of the second monosaccharide units being non-cyclic and bearing aldehyde functions, said aldehyde functions possibly forming hemiacetal functions with hydroxy functions of the cellulosic material.

2. The compound according to claim 1 , wherein the branched monosaccharides are at least on of xyloses, galactoses, fucoses and arabinoses.

3. The compound according to claim 1 , wherein the polysaccharide bearing non-cyclic branched monosaccharides bearing aldehyde functions are oxidized xyloses.

4. The compound according to claim 1 , wherein the adsorbed polysaccharide is selected from the group composed of a tamarind seed xyloglucan (TXG), a pea xyloglucan, and any of the mixtures thereof.

5. The compound according to claim 1 , wherein the polysaccharide is oxidized by a periodate.

6. The compound according to claim 1 , wherein the polysaccharide has a degree of oxidation higher than 0% and lower than or equal to 50%, expressed in number of oxidized saccharide units out of the total number of saccharide units.

7. The compound according to claim 1 , wherein the polysaccharide is covalently bonded to the cellulosic material by hemiacetal functions between aldehyde functions of branched monosaccharides and hydroxy functions of the cellulosic material.

8. The compound according to claim 1 , wherein the polysaccharide is also covalently bonded by one or more reactive molecules reacting with aldehyde functions of the polysaccharide.

9. The compound according to claim 1 , wherein the polysaccharide is also covalently bonded by at least two reactive molecules reacting with aldehyde functions of the polysaccharide.

10. A method for covalently binding a cellulosic material with a polysaccharide, said method comprising the adsorption of a polysaccharide on a cellulosic material to form a compound according to claim 1 , and the reaction of aldehyde functions of the polysaccharide with hydroxy functions of the cellulosic material to form hemiacetal functions.

11. The method according to claim 10 , wherein adsorption is conducted with the cellulosic material in an aqueous medium.

12. The method according to claim 10 , wherein the compound is formed and dried in the form of paper, fibres, or nonwovens.

13. The method according to claim 10 , wherein the polysaccharide is covalently bonded to the cellulosic substrate and caused to react with one or more reactive molecules reacting with aldehyde functions of the polysaccharide.

14. The method according to claim 13 , wherein the polysaccharide is used as additive to reinforce the strength in the wet state of a cellulosic material comprising hydroxy functions.

15. The method according to claim 13 , wherein the polysaccharide is used as additive to reinforce the strength in the dry state of a cellulosic material comprising hydroxy functions.

16. A method of forming the compound of claim 1 , comprising adding a polysaccharide as reinforcing additive of a cellulosic material comprising hydroxy functions, said polysaccharide being an oxidized xyloglucan comprising non-cyclic branched monosaccharides bearing aldehyde functions, wherein some aldehyde functions possibly form hemiacetal functions with hydroxy functions of the cellulosic material, said polysaccharide being able to adsorb on the cellulosic material.

17. A method of imparting a new functionality to the compound of claim 1 , comprising adding one of more reactive molecules that react with aldehyde functions of the compound, wherein the one or more functions are selected from the group consisting of antiseptic, colouring, and increasing the mechanical properties of the material thus formed, and wherein said reactive molecules are selected from the group consisting of amines, polyamines, hydroxylamines, imines, hydrazide, and any combinations thereof.

Assignees

• Centre Nat Rech Scient

Inventors

• Gaffiot Lauric
• Heux Laurent

Classifications

• D21H17/31

  Gums · CPC title

• C08B37/0096

  Guar, guar gum, guar flour, guaran, i.e. (beta-1,4) linked D-mannose units in the main chain branched with D-galactose units in (alpha-1,6), e.g. from Cyamopsis Tetragonolobus; Derivatives thereof · CPC title

• C08B37/0093

  Locust bean gum, i.e. carob bean gum, with (beta-1,4)-D-mannose units in the main chain branched with D-galactose units in (alpha-1,6), e.g. from the seeds of carob tree or Ceratonia siliqua; Derivatives thereof · CPC title

• C08B37/0087

  Glucomannans or galactomannans; Tara or tara gum, i.e. D-mannose and D-galactose units, e.g. from Cesalpinia spinosa; Tamarind gum, i.e. D-galactose, D-glucose and D-xylose units, e.g. from Tamarindus indica; Gum Arabic, i.e. L-arabinose, L-rhamnose, D-galactose and D-glucuronic acid units, e.g. from Acacia Senegal or Acacia Seyal; Derivatives thereof · CPC title

• D21H21/20

  Wet strength agents · CPC title