Pressure-sensitive hot melt adhesive composition including propylene thermoplastic elastomer and articles including the same
View Patent ↗A pressure-sensitive hot melt adhesive composition is disclosed that includes at least 10% by weight of a first propylene thermoplastic elastomer, at least 25% by weight of a first tackifying agent exhibiting a softening point of at least 120° C., and at least 25% by weight plasticizer.
1. A pressure-sensitive hot melt adhesive composition comprising:
at least 10% by weight of a first propylene thermoplastic elastomer comprising at least 50% by weight propylene;
at least 25% by weight plasticizer; and
at least 25% by weight of a first tackifying agent exhibiting a softening point of at least 120° C.
2. The pressure-sensitive adhesive composition of claim 1 , wherein the composition exhibits an initial peel force to cotton of at least 100 gram force per 25 millimeters.
3. The pressure-sensitive adhesive composition of claim 1 , wherein the composition exhibits a change in peel force to cotton, after aging for two weeks at 50° C. relative to an initial peel force, of no greater than 20%.
4. The pressure-sensitive adhesive composition of claim 1 , wherein the composition exhibits an adhesive transfer of no greater than 50 gram force.
5. The pressure-sensitive adhesive composition of claim 1 , wherein the composition has an oil bleed rating of no greater than 3 when tested according to the Oil Bleed test method.
6. The pressure-sensitive adhesive composition of claim 1 , wherein the composition is free from oil bleed when tested according to the Oil Bleed test method.
7. The pressure-sensitive adhesive composition of claim 1 , wherein the first tackifying agent exhibits a softening point of at least 130° C.
8. The pressure-sensitive adhesive composition of claim 1 , wherein the first tackifying agent exhibits a softening point of at least 135° C.
9. The pressure-sensitive adhesive composition of claim 1 further comprising a second tackifying agent.
10. The pressure-sensitive adhesive composition of claim 9 , wherein the second tackifying agent exhibits a softening point of no greater than 100° C.
11. The pressure-sensitive adhesive composition of claim 9 , wherein the first tackifying agent comprises a hydrogenated hydrocarbon resin and the second tackifying agent comprises an aromatic modified aliphatic hydrocarbon resin.
12. The pressure-sensitive adhesive composition of claim 1 further comprising a polymer exhibiting a viscosity of no greater than 10,000 centipoise at 190° C. and a softening point greater than 90° C.
13. The pressure-sensitive adhesive composition of claim 1 further comprising a polymer comprising a thermoplastic polyolefin, a wax, or a combination thereof.
14. The pressure-sensitive adhesive composition of claim 1 , wherein the first propylene thermoplastic elastomer exhibits a melt index of no greater than 20 grams per 10 minutes.
15. The pressure-sensitive adhesive composition of claim 1 , wherein the first propylene thermoplastic elastomer exhibits a melt index of no greater than 10 grams per 1.0 minutes.
16. The pressure-sensitive adhesive composition of claim 1 , wherein the first propylene thermoplastic elastomer exhibits a density of no greater than 0.88 grams per cubic centimeter.
17. The pressure-sensitive adhesive composition of claim 1 , wherein the first propylene thermoplastic elastomer comprises a polypropylene-polyethylene copolymer.
18. The pressure-sensitive adhesive composition of claim 1 further comprising a second propylene thermoplastic elastomer different from the first propylene thermoplastic elastomer.
19. The pressure-sensitive adhesive composition of claim 18 , wherein the second propylene thermoplastic elastomer comprises a propylene-ethylene copolymer.
20. The pressure-sensitive adhesive composition of claim 1 further comprising a hydrogenated styrene block copolymer.
21. The pressure-sensitive adhesive composition of claim 1 further comprising styrene-ethylene-butene-styrene block copolymer, styrene-ethylene-propylene-styrene block copolymer, styrene-ethylene-ethylene-propylene-styrene block copolymer, or a combination thereof.
22. The pressure-sensitive adhesive composition of claim 21 further comprising no greater than 10% by weight of styrene-ethylene-butene-styrene block copolymer, styrene-ethylene-propylene-styrene block copolymer, styrene-ethylene-ethylene-propylene-styrene block copolymer, or a combination thereof.
23. The pressure-sensitive adhesive composition of claim 1 comprising
from 25% by weight to no greater than about 55% by weight of the first tackifying agent; and
from 10% by weight to no greater than about 20% by weight of the first propylene thermoplastic elastomer.
24. The pressure-sensitive adhesive composition of claim 23 further comprising a second tackifying agent, the second tackifying agent exhibiting a softening point of no greater than 100° C., the composition comprising no greater than 20% by weight of the second tackifying agent.
25. The pressure-sensitive adhesive composition of claim 23 further comprising a second polymer, the second polymer exhibiting a viscosity of no greater than 10,000 centipoise at 190° C. and a softening point greater than 90 the composition comprising no greater than 20% by weight of the second polymer.
26. The pressure-sensitive adhesive composition of claim 1 , wherein the composition exhibits a viscosity of no greater than 20,000 centipoise at 149° C.
27. An article comprising:
a substrate; and
the pressure-sensitive adhesive composition of claim 1 disposed on the substrate.
28. The article of claim 27 , wherein the substrate comprises a nonwoven web.
29. A disposable absorbent article comprising the article of claim 27 , the disposable absorbent article comprising a diaper, a personal hygiene article, sanitary napkin, a panty liner, or a combination thereof.
30. The article of claim 27 , wherein the substrate comprises a polymer film, a metal film, a metal foil, or a combination thereof.
31. The article of claim 27 , wherein
the article is in the form of a label,
the substrate is a first substrate, and
the pressure-sensitive adhesive composition is disposed between the first substrate and a release-coated surface of a second substrate.
32. The pressure-sensitive adhesive composition of claim 1 , wherein the composition exhibits an initial peel force to stainless steel of at least 1 Newton.
33. An absorbent article comprising:
a topsheet;
a backsheet;
an absorbent core disposed between the topsheet and the backsheet;
a garment-facing surface; and
the pressure-sensitive adhesive composition of claim 1 disposed on the garment-facing surface of the absorbent article.
34. The pressure-sensitive adhesive composition of claim 1 , wherein the first tackifying agent exhibits a softening point of at least 140° C.
35. The pressure-sensitive adhesive composition of claim 1 , wherein the first tackifying agent comprises a hydrogenated hydrocarbon resin.
36. The pressure-sensitive adhesive composition of claim 1 , wherein the propylene thermoplastic elastomer is selected from the group consisting of polypropylene homopolymer, propylene alpha-olefin copolymer derived from propylene and at least one alpha olefin co-monomer, and combinations thereof.
37. The pressure-sensitive adhesive composition of claim 36 , wherein the propylene thermoplastic elastomer is selected from the group consisting of polypropylene, propylene/ethylene copolymer, propylene/ethylene/butene terpolymer, propylene/butene copolymer, propylene/hexane copolymer, propylene/octene copolymer, propylene/norbornene copolymer, and combinations thereof.
38. The pressure-sensitive adhesive composition of claim 1 , wherein the propylene thermoplastic elastomer comprises a single-site, metallocene-catalyzed propylene thermoplastic elastomer.