Search

EP-4737485-A1 - CELLULOSE-CONTAINING COMPOSITION, METHOD FOR PRODUCING SAME, AND METHOD FOR ADJUSTING VISCOSITY

EP4737485A1EP 4737485 A1EP4737485 A1EP 4737485A1EP-4737485-A1

Abstract

A composition containing: a cellulose; and a thickener, in which the cellulose contains an oxidized cellulose that is an oxide obtained by oxidizing a cellulose raw-material with a hypochlorous acid or a salt thereof and/or a nanocellulose that is a fibrillated product of the oxidized cellulose, and is substantially free of an N-oxyl compound.

Inventors

  • TAKADA, JUN
  • GOTOU, AKIHIRO
  • SEKIGUCHI, Jueri

Assignees

  • Toagosei Co., Ltd.

Dates

Publication Date
20260506
Application Date
20240605

Claims (20)

  1. A composition comprising: a cellulose; and a thickener, wherein the cellulose comprises an oxidized cellulose that is an oxide obtained by oxidizing a cellulose raw-material with a hypochlorous acid or a salt thereof and/or a nanocellulose that is a fibrillated product of the oxidized cellulose, and is substantially free of an N-oxyl compound.
  2. A composition comprising: a cellulose; and a thickener, wherein the cellulose comprises an oxidized cellulose that has a structure in which hydroxyl groups at position 2 and position 3 of a glucopyranose ring of the cellulose are oxidized and dicarboxy groups are introduced, and/or a nanocellulose that is a fibrillated product of the oxidized cellulose.
  3. The composition according to claim 1 or 2, wherein the thickener is a thickening polysaccharide.
  4. The composition according to claim 1 or 2, wherein the thickener has a hydrophobic region capable of hydrophobic interaction with the oxidized cellulose and/or the nanocellulose.
  5. The composition according to claim 1 or 2, wherein an amount of the thickener is 0.1 to 40 mass% with respect to a mass (solid content) of the oxidized cellulose and/or the nanocellulose.
  6. The composition according to claim 1 or 2, further comprising a salt.
  7. The composition according to claim 6, wherein an amount of the salt is 0.01 to 10 mass% with respect to the composition.
  8. The composition according to claim 1 or 2, further comprising a pH adjuster.
  9. The composition according to claim 8, wherein the composition has a pH in a range of 0 or more and 14.0 or less.
  10. The composition according to claim 8, wherein the pH adjuster comprises an acid or a base.
  11. The composition according to claim 1 or 2, wherein the cellulose comprises the nanocellulose.
  12. The composition according to claim 1 or 2, wherein the composition is an aqueous composition.
  13. The composition according to claim 12, wherein the aqueous composition has a viscosity of 0.01 to 1000 Pa·s.
  14. The composition according to claim 12, wherein the aqueous composition has a viscosity of 10 to 1 × 10 6 % higher than a viscosity of a control composition obtained by removing the thickener from the aqueous composition.
  15. A composition comprising: a cellulose; and a thickener, wherein the cellulose comprises an oxidized cellulose that is an oxide obtained by oxidizing a cellulose raw-material with a hypochlorous acid or a salt thereof and/or a nanocellulose that is a fibrillated product of the oxidized cellulose, and is substantially free of an N-oxyl compound, and the composition has a pH in a range of 0 or more and 14.0 or less.
  16. A composition comprising: a cellulose; and a thickener, wherein the cellulose comprises an oxidized cellulose that has a structure in which hydroxyl groups at position 2 and position 3 of a glucopyranose ring of the cellulose are oxidized and dicarboxy groups are introduced, and/or a nanocellulose that is a fibrillated product of the oxidized cellulose, and the composition has a pH in a range of 0 or more and 14.0 or less.
  17. The composition according to any one of claims 1, 2, 15, and 16, wherein the composition is a cosmetic product.
  18. A method for producing a composition comprising: a step of mixing a cellulose and a thickener, wherein the cellulose comprises an oxidized cellulose that is an oxide obtained by oxidizing a cellulose raw-material with a hypochlorous acid or a salt thereof and/or a nanocellulose that is a fibrillated product of the oxidized cellulose, and is substantially free of an N-oxyl compound.
  19. A method for producing a composition comprising: a step of mixing a cellulose and a thickener, wherein the cellulose comprises an oxidized cellulose that has a structure in which hydroxyl groups at position 2 and position 3 of a glucopyranose ring of the cellulose are oxidized and dicarboxy groups are introduced, and/or a nanocellulose that is a fibrillated product of the oxidized cellulose.
  20. A method for modifying a viscosity of an aqueous composition comprising a cellulose, the method comprising: a step of mixing the aqueous composition and a thickener, wherein the cellulose comprises an oxidized cellulose that is an oxide obtained by oxidizing a cellulose raw-material with a hypochlorous acid or a salt thereof and/or a nanocellulose that is a fibrillated product of the oxidized cellulose, and is substantially free of an N-oxyl compound.

Description

Technical Field The present invention relates to a cellulose-containing composition, a method for producing the same, and a viscosity modification method. Background Art Various technologies have been proposed with regard to producing nanocellulose materials by the oxidation of various types of cellulose raw-materials with an oxidant and the microfine-sizing of the resulting oxidized cellulose. For example, Patent Literature 1 discloses a method for producing cellulose nanofiber having a step of oxidizing a cellulose raw-material with hypochlorous acid or a salt thereof having an available chlorine concentration of 14 to 43 mass% to produce oxidized cellulose and a step of fibrillating the oxidized cellulose into nanocellulose. Patent Literature 2 discloses a method for producing oxidized cellulose by subjecting a cellulose raw-material to an oxidation reaction using hypochlorous acid or a salt thereof having an available chlorine concentration of 6 mass% to 14 mass% while controlling pH to fall within a range of 5.0 to 14.0. In these methods, the oxidation is performed without using an N-oxyl compound such as 2,2,6,6-tetramethylpiperidin-1-oxyl (TEMPO), an N-oxyl radical, so that no N-oxyl compounds remain in the cellulose fiber. As a result, it is possible to reduce environmental impact and other associated effects. Patent Literature 3 discloses oxidized cellulose that is an oxide obtained by oxidizing a cellulose raw-material with hypochlorous acid or a salt thereof, is substantially free of an N-oxyl compound, and has a degree of polymerization of 600 or less. Patent Literature 4 discloses nanocellulose that is an oxide obtained by oxidizing a cellulose raw-material with hypochlorous acid or a salt thereof, has an average fiber width of 1 nm or more and 200 nm or less, is substantially free of an N-oxyl compound, and has a zeta potential of -30 mV or less. Citation List Patent Literatures Patent Literature 1: WO 2018/230354 APatent Literature 2: WO 2020/027307 APatent Literature 3: WO 2022/009979 APatent Literature 4: WO 2022/009980 A Summary of Invention Technical Problem An object of the present invention is to provide a composition containing an oxidized cellulose that is an oxide obtained by oxidizing a cellulose raw-material with a hypochlorous acid or a salt thereof and/or a nanocellulose that is a fibrillated product of the oxidized cellulose, and having a suitably modifiable (or modified) viscosity. Solution to Problem The present inventors and the like have found that in a case where a dispersion containing an oxidized cellulose that is an oxide obtained by oxidizing a cellulose raw-material with a hypochlorous acid or a salt thereof and/or a nanocellulose that is a fibrillated product of the oxidized cellulose is mixed with a thickener, the viscosity remarkably increases. The present invention includes the following embodiments. [1] A composition comprising: a cellulose; and a thickener, in which the cellulose comprises an oxidized cellulose that is an oxide obtained by oxidizing a cellulose raw-material with a hypochlorous acid or a salt thereof and/or a nanocellulose that is a fibrillated product of the oxidized cellulose, and is substantially free of an N-oxyl compound.[2] A composition comprising: a cellulose; and a thickener, in which the cellulose comprises an oxidized cellulose that has a structure in which hydroxyl groups at position 2 and position 3 of a glucopyranose ring of the cellulose are oxidized and dicarboxy groups are introduced, and/or a nanocellulose that is a fibrillated product of the oxidized cellulose.[3] The composition according to [1] or [2], in which the thickener is a thickening polysaccharide.[4] The composition according to any one of [1] to [3], in which the thickener has a hydrophobic region capable of hydrophobic interaction with the oxidized cellulose.[5] The composition according to any one of [1] to [4], in which an amount of the thickener is 0.1 to 40 mass% with respect to a mass (solid content) of the oxidized cellulose.[6] The composition according to any one of [1] to [5], further comprising a salt.[7] The composition according to [6], in which an amount of the salt is 0.01 to 10 mass% with respect to the composition.[8] The composition according to any one of [1] to [7], further comprising a pH adjuster.[9] The composition according to [8], in which the composition has a pH in a range of 0 or more and 14.0 or less.[10] The composition according to [8] or [9], in which the pH adjuster comprises an acid or a base.[11] The composition according to any one of [1] to [10], in which the cellulose comprises the nanocellulose.[12] The composition according to any one of [1] to [11], in which the composition is an aqueous composition.[13] The composition according to [12], in which the aqueous composition has a viscosity of 0.01 to 1000 Pa·s.[14] The composition according to [12] or [13], in which the aqueous composition has a viscosity of 10 to 1 × 106% higher