Hot melt adhesive

Patent metadata

Field	Value
Publication number	US-9556366-B2
Application number	US-201514828546-A
Country	US
Kind code	B2
Filing date	Aug 18, 2015
Priority date	Sep 19, 2012
Publication date	Jan 31, 2017
Grant date	Jan 31, 2017

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 40-70 wt. % of an amorphous polyolefin composition comprising greater than 40 mole % 1-butene;
(ii) about 70-40 wt. % of a heterophase polyolefin composition having a molecular weight (Mw) less than 10,000, comprising a propene and a monomer selected from ethylene, 1-hexene, 1-octene or combinations thereof; and
(iii) about 0.1 to 30 wt. % of a polyisobutylene plasticizer polymerized with AlCl 3 and having a molecular weight (Mw) of 200-5000.

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 monomer 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 monomer 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 , wherein the plasticizer comprises a polyisobutylene with a molecular weight of about 500 to about 2000.

Assignees

• Procter & Gamble

Inventors

• Bunnelle William L

Classifications

• A61F13/539

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

• Y10T442/678

  Olefin polymer or copolymer sheet or film [e.g., polypropylene, polyethylene, ethylene-butylene copolymer, etc.] · CPC title

• C08L23/12

  Polypropene · CPC title

• C09J7/043

  Chemistry & Metallurgy · mapped topic

• B32B2535/00

  Medical equipment, e.g. bandage, prostheses or catheter · CPC title