Absorbent articles and methods of making

Patent metadata

Field	Value
Publication number	US-11076999-B2
Application number	US-201515304139-A
Country	US
Kind code	B2
Filing date	Jun 19, 2015
Priority date	Jun 27, 2014
Publication date	Aug 3, 2021
Grant date	Aug 3, 2021

Abstract

Described herein are absorbent articles and methods of making such articles. The articles are made by bonding a copolymer onto a substrate to form a core. The absorbent articles are particularly useful in personal care product, e.g., disposable hygiene products.

First claim

What is claimed is:

1. An absorbent article comprising:
a first substrate; and
a layer of copolymer irreversibly bonded onto the first substrate to form a core, wherein the core comprises acidic functional groups,
wherein the copolymer is derived from:
a first monomer selected from a (meth)acrylic acid or salt thereof;
a second monomer, wherein the second monomer is hydrophilic; and
greater than 1 wt % of a third monomer based on the total weight of monomers used, wherein the third monomer is a hydrophilic crosslinking monomer,

wherein at least 50% of the acidic functional groups in the core are neutralized with salt forming cations.

2. The absorbent article of claim 1 , wherein the second monomer is selected from at least one of 2-hydroxyethylmethacrylate, 2-hydroxypropyl(meth)acrylate, 3-hydroxypropyl(meth)acrylate, N,N-dimethylacrylamide, and acrylamide.

3. The absorbent article of claim 1 , wherein the copolymer comprises at least 1% of the second monomer.

4. The absorbent article of claim 1 , wherein the third monomer is selected from at least one of methylenebisacrylamide and polyethyleneglycoldiacrylate.

5. The absorbent article of claim 1 , further comprising a second layer, wherein the second layer is a liquid pervious layer.

6. The absorbent article of claim 5 further comprising a third layer, wherein the third layer is a liquid impervious layer and the core sandwiched between the second layer and the third layer.

7. The absorbent article of claim 5 , wherein the second layer is selected from polyester, polyolefin, rayon, cotton, and combinations thereof.

8. The absorbent article of claim 1 , wherein the first substrate is selected from at least one of a thermoplastic and a fabric.

9. The absorbent article of claim 1 , wherein the absorbent article is selected from a diaper, a feminine hygiene pad, an animal hygiene pad, a wound care article, and a chemical absorbent pad.

10. The absorbent article of claim 1 , wherein the first substrate is selected from at least one of a polypropylene, polyethylene, Nylon X, cotton, and cellulose.

11. The absorbent article of claim 1 , wherein the copolymer comprises no more than 30% by weight of a second monomer versus the total weight of monomer.

12. The absorbent article of claim 1 , wherein the copolymer comprises at least 3 and no more than 10% by weight of the third monomer.

13. The absorbent article of claim 1 , wherein the copolymer comprises at least 5% and no more than 20% by weight of the second monomer versus the total weight of monomer.

14. The absorbent article of claim 1 , wherein the copolymer comprises 40 to 97% by weight of the first monomer versus the total weight of monomer.

15. The absorbent article of claim 1 , wherein the copolymer comprises a fourth monomer, wherein the fourth monomer is not hydrophilic.

16. The absorbent article of claim 1 , wherein the second monomer comprises a hydroxyl group-, containing monomer.

17. A method of making an absorbent article comprising:
(a) contacting a polymerizable solution to a first substrate, wherein the polymerizable solution comprises (i) a first monomer selected from a (meth)acrylic acid or salt thereof; (ii) a second monomer, wherein the second monomer is hydrophilic; and (iii) greater than 1 wt % of a third monomer based on the total weight of monomers used, wherein the third monomer is a hydrophilic crosslinking monomer; and
(b) polymerizing the polymerizable solution to irreversibly bond a copolymer onto the first substrate forming a core, wherein the core comprises acidic functional groups, and
wherein at least 50% of the acidic functional groups in the core are neutralized with salt forming cations.

18. The method of claim 17 , wherein the polymerizable solution further comprises a Type II photoinitiator.

19. The method of claim 17 , further comprising washing the core.

20. The method of claim 17 , where the absorbent article is a roll good.

Assignees

• 3M Innovative Properties Co

Inventors

• Rasmussen Jerald K
• Ali Mahfuza B
• Chong Conklin Bathsheba E
• Klein Andrew P
• Langer Scott E

Classifications

• A61F2013/15463

  Absorbency · CPC title

• A61F13/53 Primary

  characterised by the absorbing medium (A61F13/20 takes precedence) · CPC title

• A61F2013/530642

  being cross-linked or polymerised in situ · CPC title

• A61F13/15203

  Properties of the article, e.g. stiffness or absorbency (chemical aspects A61L15/00) · CPC title

• A61F13/15577

  Apparatus or processes for manufacturing · CPC title