ARTICLE WITH TACKIFIER-FREE ADHESIVE

• US 20150173958A1
• Filed: 06/12/2014
• Published: 06/25/2015
• 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
• Granted Patent: US 10,639,210 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• 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 butane 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 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 suitable for joining at least two absorbent article components together, wherein the hot melt adhesive composition consists essentially of;

(i) an amorphous polyolefin composition comprising more than 40% 1-butene; and

(ii) a second amorphous polymer comprising at least one butane monomer, the polymer having a molecular weight (MW_n) of at least 1000 wherein the polymer is compatible with the polyolefin.

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 adhesive is substantially free of a tackifier.

13. The absorbent article of claim 1, wherein the 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.

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

15. The absorbent article of claim 1, wherein the second amorphous polymer comprises a polyisobutylene with a molecular weight of 1500 to 6000.

16. The absorbent article of claim 15, wherein the adhesive comprises about 50 to 90 wt. % of the amorphous polymer and about 10 to 50 wt. % of the polyisobutylene.

17. The absorbent article of claim 1, wherein the density of the adhesive is less than 0.9 g/cm³.

18. A method of assembling an absorbent article comprising the steps of:

a) providing a hot melt adhesive composition wherein said adhesive comprises

(i) an amorphous polyolefin composition comprising more than 40% 1-butene; and

(ii) a second amorphous polymer comprising at least one butane monomer, the polymer having a molecular weight (MW_n) of at least 1000 wherein the polymer is compatible with the polyolefin, and wherein the hot melt adhesive is substantially free of tackifier;

b) providing a plurality of absorbent article components; and

c) joining at least one of said absorbent article components to another of said absorbent article components using said adhesive so as to assemble said absorbent article.

19. The method of claim 18, wherein step c comprises the step of joining a topsheet to an underlying nonwoven layer.

20. The method of claim 18, wherein step c comprises the step of joining an elastic material to a nonwoven and backsheet materials.

21. The method of claim 18, wherein step c comprises the step of joining an acquisition layer to a core layer.

22. The method of claim 18, wherein step c comprises the step of joining a distribution layer to a core layer.

23. The method of claim 18, wherein step c comprises the step of joining a topsheet to a backsheet adjacent a longitudinal edge of said absorbent article.

24. The method of claim 18, wherein step c comprises the step of joining receiving member to a backsheet.

25. The method of claim 18, wherein step c comprises the step of joining a core cover to a backsheet.

26. The method of claim 18, wherein step c comprises the step of joining a core cover to a dusting layer.

27. The method of claim 18, wherein step c comprises the step of joining a core to a backsheet.

28. The method of claim 18, wherein step c comprises the step of joining a dusting layer to a backsheet.

29. The method of claim 18, wherein the amorphous polyolefin polymer comprises less than 50 wt. % of one or more alpha olefin C₂ or C_4-20 monomers.

30. The method of claim 18, wherein the second amorphous polymer comprises a polyisobutylene with a molecular weight of 1500 to 6000.

31. The method of claim 18, wherein the adhesive comprises about 50 to 90 wt. % of the amorphous polymer and about 10 to 50 wt. % of the polyisobutylene.