HOT MELT ADHESIVE

• US 20150174281A1
• Filed: 06/12/2014
• Published: 06/25/2015
• Est. Priority Date: 12/19/2013
• Status: Abandoned Application

• Current Assignee: The Procter & Gamble Company
• Original Assignee: The Procter & Gamble Company
• Inventors: BUNNELLE, William L.
• Application Number:
  US14/302,736
• Publication Number:
  US 20150174281A1
• 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

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 compatible amorphous polymer.

Claims

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) 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 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 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.

19. The absorbent article of claim 1, wherein the first substrate comprises a nonwoven and the second substrate comprises a polymer film.

20. The absorbent article of claim 1, wherein the first substrate is a liquid permeable interior layer comprising a nonwoven and the second substrate is a liquid impervious exterior layer comprising a polymer film and a nonwoven.

18. A disposable absorbent article comprising a first substrate, a second substrate, and a hot melt adhesive composition bonding the first substrate and the second substrate to one another, wherein the hot melt adhesive 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.