Article with tackifier-free adhesive

• US 10,639,210 B2
• Filed: 06/12/2014
• Issued: 05/05/2020
• Est. Priority Date: 12/19/2013
• 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): Kidwell, Michele M
• Application Number:
  US14/302,745
• Publication Number:
  US 20150173958A1
• Time in Patent Office: 2,154 Days
• CPC Class Codes: A61F 13/15203 Properties of the article, e.g. stiffness or absorbency chemical aspects A61L15/00
• 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 2013/15569 Adhesivity
• CPC Class Codes: A61L 15/24 Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives thereof A61L15/225 takes precedence
• CPC Class Codes: A61L 15/42 Use of materials characterised by their function or physical properties liquid bandages A61L26/00
• CPC Class Codes: A61L 15/585 Mixtures of macromolecular compounds
• CPC Class Codes: A61L 2300/802 Additives, excipients, e.g. cyclodextrins, fatty acids, surfactants
• CPC Class Codes: B32B 2250/02 2 layers
• CPC Class Codes: B32B 23/00 Layered products comprising a layer of cellulosic plastic substances , i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose
• CPC Class Codes: B32B 2555/02 Diapers or napkins
• CPC Class Codes: B32B 7/12 using interposed adhesives or interposed materials with bonding properties
• CPC Class Codes: C08L 2205/025 containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
• CPC Class Codes: C08L 2207/324 Liquid component is low molecular weight polymer
• CPC Class Codes: C08L 23/20 having four to nine carbon atoms
• CPC Class Codes: C08L 23/22 Copolymers of isobutene; Butyl rubber ; Homo- or copolymers of other iso-olefins
• CPC Class Codes: C09J 123/20 having four to nine carbon atoms
• CPC Class Codes: C09J 123/22 Copolymers of isobutene; Butyl rubber ; Homo- or copolymers of other iso-olefines
• CPC Class Codes: C09J 2301/304 the adhesive being heat-activatable, i.e. not tacky at temperatures inferior to 30°C
• CPC Class Codes: C09J 5/06 involving heating of the applied adhesive
• CPC Class Codes: Y10T 428/3188 Next to cellulosic
• CPC Class Codes: Y10T 428/31938 : Polymer of monoethylenically unsaturated hydrocarbon

Abstract

Disposable absorbent articles assembled from a collection of components using an adhesive consisting essentially of an amorphous polyolefin composition comprising more than 40% 1-butene and a second amorphous polymer comprising at least one butene monomer, the polymer having a molecular weight (MW_n) of at least 1000, wherein the polymer is compatible with the polyolefin.

Claims

1. A disposable absorbent article comprising a longitudinal centerline, a lateral centerline, a front waist region comprising a front waist edge, a rear waist region comprising a rear waist edge, a crotch region disposed between said front and rear waist regions, two spaced apart longitudinal side edges joining said front waist edge to said rear waist edge, and comprising:

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 disposed adjacent and inboard one of said longitudinal side edges;

iii) gasketing cuffs disposed between said longitudinal side edge and said barrier cuffs;

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 suitable for joining at least two absorbent article components together, wherein said hot melt adhesive composition comprises;

(i) from about 50 wt. % to about 90 wt. % of an amorphous polyolefin composition comprising more than 40% 1-butene; and

(ii) from about 10 wt. % to about 50 wt. % of a second amorphous polymer comprising a polyisobutylene with a molecular weight of 1500 to 6000;

and wherein said hot melt adhesive composition comprises less than 5% of a tackifier.

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 said acquisition layer to said core cover.

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

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

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

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

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

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

12. The absorbent article of claim 1, wherein said second amorphous polymer comprises a viscous liquid with molecular weight of about 200-20,000 and a Saybolt Universal seconds (SUS) viscosity at 100°

C. of about 100 to 20,000.

13. The absorbent article of claim 1, wherein said amorphous polyolefin composition comprises less than 50 wt. % of one or more alpha olefin C₂ or C_4-20 monomers.

14. The absorbent article of claim 1, wherein said adhesive has a density of less than 0.9 g/cm³.