Hot melt adhesive

• US 10,357,407 B2
• Filed: 12/18/2014
• Issued: 07/23/2019
• 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.
• Primary Examiner(s): Vasat, Peter S
• Application Number:
  US14/574,701
• Publication Number:
  US 20150174286A1
• Time in Patent Office: 1,678 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

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. A hot melt adhesive composition comprising:

(i) from about 50 wt. % to about 90 wt. % of an amorphous polyolefin copolymer comprising more than 40 mole % 1-butene, the amorphous polyolefin copolymer having a viscosity of between 2000 and 8000 cps at a temperature of about 190°

C.; and

(ii) from about 10 wt. % to about 50 wt. % of a second amorphous polymer comprising at least one butene monomer, the second amorphous polymer having a molecular weight (MW_n) of at least 1000, wherein the second amorphous polymer is compatible with the amorphous polyolefin copolymer.

2. The hot melt adhesive composition of claim 1, wherein the adhesive is substantially free of a tackifier.

3. The hot melt adhesive composition of claim 1, wherein the second amorphous polymer comprises a viscous liquid with molecular weight of about 1,000-20,000 and a Saybolt Universal seconds (SUS) viscosity at 100°

C. of about 100 to 20,000.

4. The hot melt adhesive composition of claim 1, wherein the second amorphous polymer comprises a polyisobutylene with a molecular weight of 1,500 to 6,000.

5. The hot melt adhesive composition of claim 1, wherein the density of the adhesive composition is less than 0.9 g-cm⁻

3.

6. The hot melt adhesive composition of claim 1, wherein the density of the adhesive composition is less than 0.87 g-cm⁻

3.

7. A disposable article comprising a substrate combined with a film, fiber, cellulose sheet or non-woven having an adhesive bond there between comprising the adhesive of claim 1.

8. A disposable diaper article comprising a substrate combined with a film, fiber, cellulose sheet or non-woven having an adhesive bond there between comprising the adhesive of claim 1.

9. The hot melt adhesive composition of claim 1, wherein the adhesive is substantially free of a tackifier.

10. The hot melt adhesive composition of claim 1, wherein the second amorphous polymer comprises a viscous liquid with molecular weight of about 1,000-20,000 and a Saybolt Universal seconds (SUS) viscosity at 100°

C. of about 100 to 20,000.

11. The hot melt adhesive composition of claim 1, wherein the second amorphous polymer comprises a polyisobutylene with a molecular weight of 1,500 to 6,000.

12. The hot melt adhesive composition of claim 1, wherein the density of the adhesive is less than 0.9 g-cm⁻

3.

13. The hot melt adhesive composition of claim 1, wherein the density of the adhesive is less than 0.87 g-cm⁻

3.

14. A hot melt adhesive composition comprising:

(i) about 90 wt. % to about 10 wt. % of an amorphous polyolefin composition comprising a copolymer having more than 40 mole % 1-butene, the copolymer having a viscosity of between 2000 and 8000 cps at a temperature of 190°

C.; and

(ii) about 0.1 wt. % to about 50 wt. % of a polyisobutylene;

wherein the adhesive composition is substantially free of a tackifier;

wherein the hot melt adhesive composition has a softening point temperature range of 115°

C. to about 130°

C.

15. The hot melt adhesive composition of claim 14, wherein the polyisobutylene has a molecular weight of about 2000 to 3000.

16. The hot melt adhesive composition of claim 14, wherein the density of the adhesive composition is less than 0.9 g-cm⁻

3.

17. The hot melt adhesive composition of claim 14, wherein the density of the adhesive composition is less than 0.87 g-cm⁻

3.

18. A disposable article comprising a substrate combined with a film, fiber, cellulose sheet or non-woven having an adhesive bond there between comprising the adhesive of claim 14.

19. A disposable diaper article comprising a substrate combined with a film, fiber, cellulose sheet or non-woven having an adhesive bond there between comprising the adhesive of claim 14.

20. A hot melt adhesive composition consisting essentially of:

(i) a blend of amorphous polyolefin copolymers, each amorphous polyolefin copolymer comprising more than 40 mole % 1-butene, at least one amorphous polyolefin copolymer having a viscosity of between 2000 and 8000 cps at a temperature of 190°

C.; and

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

21. A disposable article comprising a substrate combined with a film, fiber, cellulose sheet or non-woven having an adhesive bond there between comprising the adhesive of claim 20.

22. A disposable diaper article comprising a substrate combined with a film, fiber, cellulose sheet or non-woven having an adhesive bond there between comprising the adhesive of claim 20.

23. A hot melt adhesive composition consisting essentially of:

(i) an amorphous polyolefin copolymer comprising more than 40 mole % 1-butene, the amorphous polyolefin copolymer having a viscosity of between 2000 and 8000 cps at a temperature of 190°

C.; and

(ii) a second amorphous polymer comprising at least one butene monomer, the second amorphous polymer having a molecular weight (MW_n) range of about 5,000 to about 45,000, wherein the second amorphous polymer is compatible with the amorphous polyolefin copolymer;

wherein the hot melt adhesive composition has a softening point temperature range of 115°

C. to about 130°

.