Manufacture of absorbent paper with low charge density imidazolinium containing debonder compositions

Patent metadata

Field	Value
Publication number	US-10669673-B2
Application number	US-201815868073-A
Country	US
Kind code	B2
Filing date	Jan 11, 2018
Priority date	Jan 17, 2017
Publication date	Jun 2, 2020
Grant date	Jun 2, 2020

Abstract

Absorbent sheet is manufactured utilizing a low charge density debonder composition comprising an imidazolinium surfactant-containing constituent selected from the group consisting of: (i) cationic imidazolinium surfactants with alkylalkenylhydroxy substitution; (ii) zwitterionic imidazolinium surfactants; and (iii) an ion paired surfactant mixture including a zwitterionic imidazolinium surfactant and a cationic surfactant and, in admixture with the imidazolinium surfactant-containing constituent, (iv) a nonionic surfactant.

First claim

What is claimed is:

1. A cationic imidazolinium surfactant of the formula:

wherein:
R 1 is H, methyl, ethyl, or propyl;
R 2 is a hydroxy substituted alkylalkenyl moiety having from 11 to 21 carbon atoms;
R 3 is an ethylene or propylene bridging group;
R 4 is an amidoalkenylalkyl moiety bearing a pendant hydroxyl group having from 12 to 22 carbon atoms;
p is 1 or 2; and
X is selected from halides, sulfates, carboxylates and phosphates.

2. The cationic imidazolinium surfactant according to claim 1 , wherein R 2 is:

3. The cationic imidazolinium surfactant according to claim 1 , wherein R 4 is:

4. A debonder composition for absorbent paper manufacture comprising a cationic imidazolinium surfactant of claim 1 in admixture with a nonionic surfactant.

5. The debonder composition according to claim 4 , wherein the debonder composition comprises from 5 to 45 wt. % of cationic imidazolinium surfactant and from 65 to 95 wt. % of nonionic surfactant.

6. The debonder composition according to claim 4 , wherein the debonder composition exhibits a charge density of 0.20 meq/g or less.

7. The debonder composition according to claim 6 , wherein the debonder composition exhibits a charge density of from 0.10 meq/g to 0.20 meq/g.

8. A method of making absorbent sheet comprising:
(a) preparing an aqueous furnish of papermaking fibers;
(b) incorporating a debonder composition into the aqueous furnish, said debonder composition comprising:
(i) an imidazolinium surfactant according to claim 1 , and,
(ii) in admixure with the imidazolinium surfactant, a nonionic surfactant;

(c) incorporating a cationic wet strength resin into the aqueous furnish; and
(d) forming the papermaking furnish into absorbent sheet.

9. The method of making absorbent sheet according to claim 8 , wherein the debonder composition exhibits a charge density of from −0.1 to 0.3 meq/g.

10. The method of making absorbent sheet according to claim 9 , wherein the debonder composition exhibits a charge density of 0.25 meq/g or less.

11. The method of making absorbent sheet according to claim 10 , wherein the debonder composition exhibits a charge density of from 0.175 to 0.225 meq/g.

12. The method according to claim 8 , wherein the cationic wet strength resin is incorporated into the aqueous furnish at a level of from 2.5 to 30 lbs/ton of papermaking fiber.

13. The method according to claim 8 , wherein the cationic wet strength resin is incorporated into the aqueous furnish at a level of from 5 to 25 lbs/ton of papermaking fiber.

14. The method according to claim 8 , wherein the cationic wet strength resin comprises a polyamidoamine epichlorohydrin permanent wet strength resin.

15. The method according to claim 8 , wherein the cationic wet strength resin comprises a glyoxylated polyacrylamide temporary wet strength resin.

16. The method according to claim 8 , wherein the debonder composition is incorporated into the aqueous furnish at a level of from 1 to 30 lbs debonder composition per ton of papermaking fiber.

17. The method according to claim 8 , wherein the debonder composition is incorporated into the aqueous furnish at a level of from 2 to 25 lbs debonder composition per ton of papermaking fiber.

18. The method according to claim 8 , wherein the debonder composition is incorporated into the aqueous furnish at a level of from 2 to 16 lbs debonder composition per ton of papermaking fiber.

Assignees

• Gpcp Ip Holdings Llc

Inventors

• Chen Yu
• Holtman Kevin M
• Hammes Brian S
• Boettcher Jeffrey J

Classifications

• D21H21/24 Primary

  Surfactants · CPC title

• D21H17/72

  of organic material · CPC title

• C07D233/16

  Radicals substituted by nitrogen atoms · CPC title

• D21H23/06

  Controlling the addition · CPC title

• D21H17/06

  Alcohols; Phenols; Ethers; Aldehydes; Ketones; Acetals; Ketals · CPC title