Hot melt adhesive

Patent metadata

Field	Value
Publication number	US-9937277-B2
Application number	US-201615382776-A
Country	US
Kind code	B2
Filing date	Dec 19, 2016
Priority date	Sep 19, 2012
Publication date	Apr 10, 2018
Grant date	Apr 10, 2018

Abstract

A hot melt adhesive material and articles made using the hot melt adhesive to assemble structures in an article. The adhesive material typically is manufactured by blending amorphous polymer with a heterophase polymer having crystallinity into an adhesive composition.

First claim

What is claimed is:

1. An absorbent article comprising a liquid permeable interior layer, a liquid impervious exterior layer, and an absorbent layer therebetween;
further comprising a hot melt adhesive composition comprising:
(i) about 90-10 wt. % of an amorphous polyolefin composition comprising at least about 40 wt. % of 1-butene monomer units; and
(ii) about 10-90 wt. % of a heterophase polyolefin propylene copolymer composition comprising propene comonomer units and a comonomer unit selected from the group consisting of ethylene, 1-hexene, 1-octene, and amorphous blocks and crystalline blocks.

2. The absorbent article of claim 1 , wherein the interior layer comprises a nonwoven.

3. The absorbent article of claim 1 , wherein the absorbent layer comprises a super absorbent material.

4. The absorbent article of claim 1 , wherein the exterior layer comprises a polymer film.

5. The absorbent article of claim 4 , wherein the exterior layer comprises a multi-layer structure.

6. The absorbent article of claim 4 , comprising another exterior layer comprising a nonwoven layer.

7. The absorbent article of claim 1 , wherein the article comprises an adhesive bond between a polymer film and a nonwoven fabric.

8. The absorbent article of claim 1 , wherein the article comprises an adhesive bond between the interior layer comprising a nonwoven and the exterior layer comprising a multi-layer structure comprising a polymer film.

9. The absorbent article of claim 1 , wherein the hot melt adhesive bonds the interior layer and the exterior layer.

10. The absorbent article of claim 1 , wherein the adhesive may be coated, applied, or sprayed onto either a nonwoven or polymer film layer of the article.

11. The absorbent article of claim 1 , wherein the article is selected from the group consisting of infant diapers, adult diapers, and feminine care pads.

12. The absorbent article of claim 1 , wherein the heterophase polyolefin comprises at least about 5 wt. % crystalline sequences or blocks.

13. The absorbent article of claim 1 , wherein the heterophase polyolefin comprises greater than 40 wt. % of propene and less than 60 wt. % of the comonomer and has a crystallinity of greater than 10%.

14. The absorbent article of claim 1 , wherein the adhesive is substantially free of a tackifier.

15. The absorbent article of claim 1 , wherein the heterophase polyolefin composition comprises greater than 40 wt. % of propene and less than 60 wt. % of the comonomer selected from ethylene, 1-hexene, 1-octene or combinations thereof and has a crystallinity of greater than 10%.

16. The absorbent article of claim 1 , wherein the adhesive composition comprises about 40 wt. % to about 50 wt. % of the heterophase polyolefin composition.

17. The absorbent article of claim 1 , further comprising about 0.1 to 30 wt. % of a polyisobutylene plasticizer polymerized with AlCl 3 and having a molecular weight (Mw) of 200-5000.

18. The absorbent article of claim 17 , wherein the plasticizer comprises a polyisobutylene with a molecular weight of about 500 to about 2000.

Assignees

• Procter & Gamble

Inventors

• Bunnelle William L

Classifications

• A61F2013/530481

  having superabsorbent materials, i.e. highly absorbent polymer gel materials · CPC title

• A61L15/585 Primary

  Mixtures of macromolecular compounds · CPC title

• A61F13/539

  characterised by the connection of the absorbent layers with each other or with the outer layers · CPC title

• A61F2013/53908

  with adhesive · CPC title

• A61L15/60

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