Hot melt adhesive

Patent metadata

Field	Value
Publication number	US-9139755-B2
Application number	US-201414302710-A
Country	US
Kind code	B2
Filing date	Jun 12, 2014
Priority date	Sep 19, 2012
Publication date	Sep 22, 2015
Grant date	Sep 22, 2015

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 consisting essentially of:
(i) about 90 to 10 wt. % of an amorphous polyolefin copolymer composition comprising 50 to 70 wt. % 1-butene;
(ii) about 10 to 90 wt. % of a heterophase polypropylene copolymer composition comprising propene and a comonomer comprising ethylene, 1-hexene or 1-octene and comprising amorphous character and crystalline blocks; and
(iii) about 0.1 to 30 wt. % of a polyisobutylene plasticizer made with an AlCl 3 ; wherein the adhesive provides cohesive strength from the heterophase polypropylene copolymer and adhesive strength from the amorphous polyolefin copolymer.

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 polypropylene copolymer comprises at least about 5 wt. % crystalline sequences or blocks.

13. The absorbent article of claim 1 , wherein the heterophase polypropylene copolymer 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 there is about 50 to 80 wt. % of the amorphous polyolefin copolymer and about 10 to 50 wt. % of the heterophase polypropylene copolymer.

Assignees

• Procter & Gamble

Inventors

• Bunnelle William L

Classifications

• C09J123/10 Primary

  Homopolymers or copolymers of propene · CPC title

• C08L23/18

  Homopolymers or copolymers of hydrocarbons having four or more carbon atoms · CPC title

• Y10T428/31924

  Including polyene monomers · CPC title

• C08L23/16

  Ethylene-propylene or ethylene-propylene-diene copolymers · CPC title

• Y10T428/31938

  Polymer of monoethylenically unsaturated hydrocarbon · CPC title