Modified fiber, methods, and systems

Patent metadata

Field	Value
Publication number	US-9995000-B2
Application number	US-201615253450-A
Country	US
Kind code	B2
Filing date	Aug 31, 2016
Priority date	Jun 30, 2014
Publication date	Jun 12, 2018
Grant date	Jun 12, 2018

Abstract

Methods of forming crosslinked cellulose include mixing a crosslinking agent with an aqueous mixture of cellulose fibers containing little to no excess water (e.g., solids content of 25-55%), drying the resulting mixture to 85-100% solids, then curing the dried mixture to crosslink the cellulose fibers. Systems include a mixing unit to form, from an aqueous mixture of unbonded cellulose fibers having a solids content of about 25-55% and a crosslinking agent, a substantially homogenous mixture of non-crosslinked, unbonded cellulose fibers and crosslinking agent; a drying unit to dry the substantially homogenous mixture to a consistency of 85-100%; and a curing unit and to cure the crosslinking agent to form dried and cured crosslinked cellulose fibers. Intrafiber crosslinked cellulose pulp fibers produced by such methods and/or systems have a chemical on pulp level of about 2-14% and an AFAQ capacity of at least 12.0 g/g.

First claim

What is claimed is:

1. Intrafiber crosslinked cellulose pulp fibers having a chemical on pulp level of 2-14% and an automatic fiber absorption quality (“AFAQ”) capacity of at least 12.0 g/g.

2. The intrafiber crosslinked cellulose pulp fibers of claim 1 , wherein the fibers include hardwood cellulose pulp fibers.

3. The intrafiber crosslinked cellulose pulp fibers of claim 2 , wherein the fibers are hardwood cellulose pulp fibers.

4. The intrafiber crosslinked cellulose pulp fibers of claim 2 , wherein the hardwood cellulose pulp fibers are eucalyptus pulp fibers.

5. The intrafiber crosslinked cellulose pulp fibers of claim 1 , wherein the fibers are intrafiber crosslinked with a polyacrylic acid and/or polycarboxylic acid crosslinking agent.

6. The intrafiber crosslinked cellulose pulp fibers of claim 1 , having an AFAQ capacity of at least 16.0 g/g.

Assignees

• Int Paper Co

Inventors

• Miller Charles E

Classifications

• D21H11/20 Primary

  Chemically or biochemically modified fibres · CPC title

• B01J2219/24

  Stationary reactors without moving elements inside · CPC title

• D21C9/001

  Modification of pulp properties (purification D21C9/08) · CPC title

• C08J3/24

  Crosslinking, e.g. vulcanising, of macromolecules (mechanical aspects B29C35/00; crosslinking agents C08K) · CPC title

• D21C9/005

  organic compounds · CPC title