Article with tackifier-free adhesive

• US 9,943,623 B2
• Filed: 12/19/2016
• Issued: 04/17/2018
• Est. Priority Date: 09/19/2012
• Status: Active Grant

• Current Assignee: The Procter & Gamble Company
• Original Assignee: The Procter & Gamble Company
• Inventors: Bunnelle, William L., Turner, Robert Haines
• Primary Examiner(s): Chin, Hui H
• Application Number:
  US15/382,779
• Publication Number:
  US 20170095588A1
• Time in Patent Office: 484 Days
• Field of Search: 524505
• CPC Class Codes: A61F 13/15699 Forming webs by bringing together several webs, e.g. by laminating or folding several webs, with or without additional treatment of the webs
• CPC Class Codes: A61F 13/49019 the elastic means being placed longitudinally, transversely or diagonally over the article
• CPC Class Codes: A61F 13/49058 characterised by the modular concept of constructing the diaper
• CPC Class Codes: A61F 13/4906 the diaper having an outer chassis forming the diaper and an independent absorbent structure attached to the chassis
• CPC Class Codes: A61F 13/515 characterised by the interconnection of the topsheet and the backsheet
• CPC Class Codes: A61F 13/565 pants type diaper
• CPC Class Codes: A61F 2013/49093 having multiple barriers
• CPC Class Codes: A61L 15/585 Mixtures of macromolecular compounds
• CPC Class Codes: B32B 7/12 using interposed adhesives or interposed materials with bonding properties
• CPC Class Codes: C08L 2205/02 containing two or more polymers of the same C08L -group
• CPC Class Codes: C08L 2205/03 containing three or more polymers in a blend
• CPC Class Codes: C08L 2207/02 Heterophasic composition
• CPC Class Codes: C08L 23/10 Homopolymers or copolymers of propene
• CPC Class Codes: C08L 23/12 Polypropene
• CPC Class Codes: C08L 23/14 Copolymers of propene C08L23/16 takes precedence
• CPC Class Codes: C08L 23/142 at least partially crystalline copolymers of propene with other olefins
• CPC Class Codes: C08L 23/16 Elastomeric ethene-propene or ethene-propene-diene copolymers, e.g. EPR and EPDM rubbers
• CPC Class Codes: C08L 23/18 Homopolymers or copolymers of hydrocarbons having four or more carbon atoms
• CPC Class Codes: C08L 23/20 having four to nine carbon atoms
• CPC Class Codes: C08L 53/00 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 Class Codes: C09J 123/14 : Copolymers of propene C09J123/16 takes precedence
• CPC Class Codes: C09J 123/142 : at least partially crystalline copolymers of propene with other olefins
• CPC Class Codes: C09J 123/18 : Homopolymers or copolymers of hydrocarbons having four or more carbon atoms
• CPC Class Codes: C09J 123/20 : having four to nine carbon atoms

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.

Claims

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 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 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 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 AlCl₃ 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.