Nonwoven glucan webs

Patent metadata

Field	Value
Publication number	US-10895028-B2
Application number	US-201615373547-A
Country	US
Kind code	B2
Filing date	Dec 9, 2016
Priority date	Dec 14, 2015
Publication date	Jan 19, 2021
Grant date	Jan 19, 2021

Abstract

Nonwoven webs formed from modified 1,3-α-D-glucan polymer and methods of forming the nonwoven webs are disclosed. The modified 1,3-α-D-glucan polymer can have a number average degree of polymerization in the range of from 55 to 10,000. The nonwoven webs can be used for personal hygiene wipes, filtration media, apparel or other uses.

First claim

What is claimed is:

1. A nonwoven web comprising fiber, wherein the fiber consists of modified 1,3-α-D-glucan polymer, wherein the modified 1,3-α-D-glucan polymer comprises 90% or greater α-1,3-glycosidic linkages, less than 1 α-1,3,6-glycosidic branch points, and a number average degree of polymerization of 55 to 10000; wherein the nonwoven web was formed on (i) a substrate under vacuum, (ii) a screen, (iii) a perforated substrate, or (iv) a belt.

2. The nonwoven web of claim 1 , wherein the modified 1,3-α-D-glucan polymer has a number average degree of polymerization of 75 to 1000.

3. The nonwoven web of claim 1 , wherein the unmodified 1,3-α-D-glucan polymer from which the modified 1,3-α-D-glucan polymer is prepared is produced by a glucosyltransferase enzyme having 90% or greater sequence identity to Gtf J.

4. The nonwoven web of claim 1 , wherein the modified 1,3-α-D-glucan polymer is a linear polymer having greater than or equal to 99% α-1,3-glycosidic linkages.

5. The nonwoven web of claim 1 , wherein the modified 1,3-α-D-glucan polymer is modified with carboxyalkyl, ether, benzyl, or ester groups, or a combination thereof.

6. The nonwoven web of claim 5 , wherein the modified 1,3-α-D-glucan polymer is modified with carboxyalkyl groups, and the carboxyalkyl groups are methylcarboxy, ethylcarboxy, propylcarboxy, butylcarboxy, pentylcarboxy, or a combination thereof.

7. The nonwoven web of claim 5 , wherein the modified 1,3-α-D-glucan polymer is modified with ether groups.

8. The nonwoven web of claim 5 , wherein the modified 1,3-α-D-glucan polymer is modified with benzyl groups.

9. The nonwoven web of claim 5 , wherein the modified 1,3-α-D-glucan polymer is modified with ester groups.

10. The nonwoven web of claim 9 , wherein the ester groups comprise an acyl group selected from acetyl, propionyl, butyryl, pentanoyl, hexanoyl, heptanoyl, octanoyl, or a combination thereof.

11. The nonwoven web of claim 1 , wherein the modified 1,3-α-D-glucan polymer is modified with an alkyl group selected from methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, or a combination thereof.

12. A nonwoven web comprising fiber, wherein the fiber comprises modified 1,3-α-D-glucan polymer, wherein the modified 1,3-α-D-glucan polymer comprises 90% or greater α-1,3-glycosidic linkages, less than 1% α-1,3,6-glycosidic branch points, and a number average degree of polymerization of 55 to 10000, and wherein the modified 1,3-α-D-glucan polymer is modified with benzyl groups.

Assignees

• Dupont Ind Biosciences Usa Llc

Inventors

• Behabtu Natnael

Classifications

• C08B37/0009

  alpha-D-Glucans, e.g. polydextrose, alternan, glycogen; (alpha-1,4)(alpha-1,6)-D-Glucans; (alpha-1,3)(alpha-1,4)-D-Glucans, e.g. isolichenan or nigeran; (alpha-1,4)-D-Glucans; (alpha-1,3)-D-Glucans, e.g. pseudonigeran; Derivatives thereof · CPC title

• D04H1/56

  in association with fibre formation, e.g. immediately following extrusion of staple fibres · CPC title

• D01D5/0046

  the fibre formed by coagulation, i.e. wet electro-spinning · CPC title

• D10B2501/00

  Wearing apparel · CPC title

• D01D5/04

  Dry spinning methods {(D01D5/0038 takes precedence)} · CPC title