Article with tackifier-free adhesive

Patent metadata

Field	Value
Publication number	US-9555152-B2
Application number	US-201514968932-A
Country	US
Kind code	B2
Filing date	Dec 15, 2015
Priority date	Sep 19, 2012
Publication date	Jan 31, 2017
Grant date	Jan 31, 2017

Abstract

Disposable absorbent articles assembled from a collection of components using an adhesive comprising an amorphous polyolefin composition and a heterophase polyolefin composition comprising amorphous character and crystalline blocks.

First claim

What is claimed is:

1. A disposable absorbent article having a longitudinal centerline and a lateral centerline, a front waist region with a front waist edge, a rear waist region with a rear waist edge, a crotch region disposed between said front and rear waist regions and two spaced apart longitudinal side edges joining said front waist edge to said rear waist edge and comprising an assembly of components including:
a) a topsheet;
b) a backsheet underlying said topsheet;
c) an absorbent core disposed between said topsheet and said backsheet, wherein said absorbent core comprises at least one of a core cover, a dusting layer, an acquisition layer, a distribution layer and a storage member;
d) at least one additional component selected from the group consisting of:
i) a fastening system for joining said front waist region to said rear waist region when said absorbent article is worn;
ii) barrier cuffs lying adjacent and inboard one of said longitudinal side edges;
iii) gasketing cuffs lying between said longitudinal side edge and said barrier cuff;
iv) front ears disposed in said front waist region;
v) back ears disposed in said rear waist region; and
vi) a receiving member; and

e) a hot melt adhesive composition joining at least two absorbent article components together, wherein said adhesive composition comprises:
(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 said hot melt adhesive joins said topsheet to an underlying nonwoven layer.

3. The absorbent article of claim 1 , wherein said hot melt adhesive joins an elastic material to a nonwoven material to form said barrier cuffs.

4. The absorbent article of claim 1 , wherein said hot melt adhesive joins an elastic material to said backsheet.

5. The absorbent article of claim 1 , wherein said hot melt adhesive joins the acquisition layer to the core cover.

6. The absorbent article of claim 1 , wherein said hot melt adhesive joins the distribution layer to the core cover.

7. The absorbent article of claim 1 , wherein said hot melt adhesive joins the topsheet to the backsheet adjacent a longitudinal edge of said absorbent article.

8. The absorbent article of claim 1 , wherein said hot melt adhesive joins the receiving member to the backsheet.

9. The absorbent article of claim 1 , wherein said hot melt adhesive joins the core cover to the dusting layer.

10. The absorbent article of claim 1 , wherein said hot melt adhesive joins the core cover to the backsheet.

11. The absorbent article of claim 1 , wherein said hot melt adhesive joins the dusting layer to the backsheet.

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
• Turner Robert Haines

Classifications

• C09J123/18 Primary

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

• C08L53/00

  Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers · CPC title

• C08L23/18

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

• C08L23/16

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

• C09J123/142

  at least partially crystalline copolymers of propene with other olefins · CPC title