Binder compositions for making crosslinked cellulose fiber

Patent metadata

Field	Value
Publication number	US-2017356134-A1
Application number	US-201515526781-A
Country	US
Kind code	A1
Filing date	Nov 20, 2015
Priority date	Nov 21, 2014
Publication date	Dec 14, 2017
Grant date	—

Abstract

The present invention provides aqueous compositions for treating fluff pulp comprising (i) one or more acrylic acid polymers containing phosphinate groups and having a weight average molecular weight of from 1,000 to 6,000 and (ii) from 5 to 50 wt. %, based on the total solids weight of the aqueous compositions, of one or more polyethylene glycols, having a formula weight of from 150 to 7,000, or, preferably, from 200 to 600. The present invention also provides individualized, intrafiber crosslinked cellulosic fibers comprising the cellulosic fiber and, in cured form, the aqueous compositions, as well as methods of making the individualized, intrafiber crosslinked cellulosic fibers.

First claim

1 . An aqueous composition for treating fluff pulp comprising (i) one or more acrylic acid polymers containing phosphinate groups and having a weight average molecular weight of from 1,000 to 6,000 and (ii) from 5 to 50 wt. %, based on the total solids weight of the aqueous compositions, of one or more polyethylene glycols, having a formula weight of from 150 to 7,000.

2 . The aqueous composition as claimed in claim 1 , wherein the amount of the (ii) one or more polyethylene glycols ranges from 13 to 40 wt. %, based on the total solids weight of the aqueous compositions.

3 . The aqueous composition as claimed in claim 1 , wherein the (ii) one or more polyethylene glycols has a formula weight of from 200 to 600.

4 . The aqueous composition as claimed in claim 1 , wherein the aqueous compositions have a solids content of from 50 to 70 wt. %, based on the total weight of the compositions.

5 . The aqueous composition as claimed in claim 1 , wherein the (i) one or more acrylic acid polymers have from 2 to 20 wt. % of phosphinate groups taken as the amount of phosphorus acid catalysts used to make the acrylic acid polymers based on the total weight of reactants used to make the acrylic acid polymers.

6 . The aqueous composition as claimed in claim 1 , wherein the (i) one or more acrylic acid polymers is polyacrylic acid.

7 . An individualized, intrafiber crosslinked cellulosic fiber comprising the cellulosic fiber and, in cured form, the aqueous compositions chosen from claim 1 or an aqueous composition of (i) one or more acrylic acid polymers containing phosphinate groups and having a weight average molecular weight of from 1,000 to 6,000 and (ii) from 5 to 50 wt. %, based on the total solids weight of the aqueous compositions, of one or more C1 to C2 alkoxy polyethylene glycols, having a formula weight of from 150 to 7,000.

8 . The individualized, intrafiber crosslinked cellulosic fiber as claimed in claim 7 , wherein the amount of the aqueous compositions in cured form ranges from 0.5 to 15 wt. %, based on the total dry weight of the untreated cellulosic fibers.

9 . A method of using the aqueous compositions as claimed in claim 1 to form individualized, intrafiber crosslinked crosslinked cellulosic fibers comprising contacting with the aqueous compositions a collection of fluff pulp or a sheet thereof to form treated fluff pulp, and, a) in any order, drying, curing and defiberizing the treated fluff pulp to produce individualized, intrafiber crosslinked fibers, preferably, drying, defiberizing and curing or defiberizing, drying and curing.

10 . The method as claimed in claim 9 , wherein the drying and curing takes place sequentially, in separate steps.

Assignees

• Rohm & Haas

Inventors

• Rand Charles J
• Finch William C
• Rodowski C Damien
• Williams Drew E

Classifications

• D21H15/00

  Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution · CPC title

• D21H17/53

  Polyethers; Polyesters · CPC title

• D21C9/002 Primary

  by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives · CPC title

• D21H17/37

  Polymers of unsaturated acids or derivatives thereof, e.g. polyacrylates · CPC title

• D21C9/007

  by mechanical or physical means · CPC title