Absorbent articles and methods of making

Patent metadata

Field	Value
Publication number	US-10039856-B2
Application number	US-201515319021-A
Country	US
Kind code	B2
Filing date	Jun 22, 2015
Priority date	Jun 27, 2014
Publication date	Aug 7, 2018
Grant date	Aug 7, 2018

Abstract

Described herein are absorbent articles 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. In some embodiments, the absorbent article includes a first substrate; and a copolymer irreversibly bonded onto the first substrate to form a core, wherein the copolymer is derived from a polymerizable solution comprising: (a) a first monomer selected from a (meth)acrylic acid or salt thereof; (b) greater than 1 wt % of a second monomer, wherein the second monomer is a hydrophilic crosslinking monomer, and (c) a polymeric porogen.

First claim

What is claimed is:

1. An absorbent article comprising:
a first substrate; and
a copolymer irreversibly bonded onto the first substrate to form a core,
wherein the copolymer is derived from a polymerizable solution comprising:
(a) a first monomer selected from a (meth)acrylic acid or salt thereof;
(b) greater than 1 wt % of a second monomer versus the total monomer weight, wherein the second monomer is a hydrophilic crosslinking monomer, and
(c) a polymeric porogen

wherein the core comprises acidic functional groups and at least 50% of the acidic functional groups in the core are neutralized with salt forming cations and wherein the core is free of super absorbent polymer particles and cellulosic nanofibrils.

2. The absorbent article of claim 1 , wherein the polymeric porogen has a molecular weight of at least 200 grams per mole.

3. The absorbent article of claim 1 , comprising 1 wt % of the polymeric porogen.

4. The absorbent article of claim 1 , wherein the polymeric porogen comprises polyethyleneglycol, polypropyleneglycol or combinations thereof.

5. The absorbent article of claim 1 , wherein the polymerizable solution further comprises a third monomer, wherein the third monomer is selected from at least one of 2-hydroxyethylmethacrylate, 2-hydroxypropyl(meth)acrylate, 3-hydroxypropyl(meth)acrylate, N,N-dimethylacrylamide, and acrylamide.

6. The absorbent article of claim 1 , wherein the second monomer comprises at least one of methylenebisacrylamide and polyethyleneglycoldiacrylate.

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

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

9. The absorbent article of claim 7 further comprising a third layer, wherein the third layer is a liquid impervious layer and the core is sandwiched between the second layer and the third layer.

10. The absorbent article of claim 9 , wherein the third layer is a polyolefin.

11. The absorbent article of claim 1 , wherein the first substrate comprises at least one of a thermoplastic and a fabric.

12. The absorbent article of claim 1 , wherein the first substrate comprises at least one of a polypropylene, polyethylene, polyamide, cotton, and cellulose.

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

14. A method of making an absorbance 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 polymeric porogen; and (iii) greater than 1 wt % of a second monomer versus the total monomer weight, wherein the second 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 at least 50% of the acidic functional groups in the core are neutralized with salt forming cations and wherein the core is free of super absorbent polymer particles and cellulosic nanofibrils.

15. The method of claim 14 , wherein the polymerizable solution further comprises a Type II photoinitiator.

16. The method of claim 14 , wherein the polymerizable solution is contacted to the first substrate by a coating process.

17. The method of claim 14 , wherein the polymerization is initiated with UV or e-beam radiation.

18. The method of claim 14 , further comprising washing the core.

19. The method of claim 14 , further comprising drying the core.

20. The method of claim 14 , 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

• A61L15/425 Primary

  Porous materials, e.g. foams or sponges · CPC title

• C08J2201/046

  Elimination of a polymeric phase · CPC title

• B01J20/267

  Cross-linked polymers · CPC title

• A61L15/60

  Liquid-swellable gel-forming materials, e.g. super-absorbents · CPC title

• C08J2333/02

  Homopolymers or copolymers of acids; Metal or ammonium salts thereof · CPC title