Elastic attachment hot melt adhesive composition and a disposable absorbent article made with the same
The invention features a hot melt adhesive composition based on olefin polymers that can be used for elastic attachment in the manufacture of a disposable article. The hot melt adhesive includes from about 3 to about 10% by weight of a first propylene-based copolymer having a melt index measured by ASTM D1238 (190° C., 2.16 kg) of no greater than about 5, a second propylene-based polymer with a viscosity at 190° C. of no greater than about 5000 cps, a first tackifying agent having a softening point of at least about 90° C. and from about 5% by weight to about 20% by weight of a plasticizer.
1. A hot melt adhesive composition comprising:
a. from about 3 to about 10% by weight of a first propylene-based copolymer that is single-site catalyzed having a melt index measured by ASTM D1238 (190° C., 2.16 kg) of no greater than about 5,
b. a second propylene-based polymer that is single-site catalyzed with a viscosity at 190° C. of no greater than about 5000 cps,
c. a first tackifying agent having a softening point of at least about 90° C. and
d. from about 5% by weight to about 20% by weight of a plasticizer.
2. The hot melt adhesive composition of claim 1 wherein the first tackifying agent is present at from about 20% to about 70% by weight.
3. The hot melt adhesive composition of claim 1 wherein the first tackifying agent has a softening point of at least about 110° C.
4. The hot melt adhesive composition of claim 1 wherein the first propylene-based copolymer has an ethylene content of no less than about 10.
5. The hot melt adhesive composition of claim 1 wherein the first propylene-based copolymer is present at from about 3% by weight to about 7% by weight.
6. The hot melt adhesive composition of claim 1 wherein the second propylene-based polymer has a viscosity at 190° C. of no greater than about 3,000 cps.
7. The hot melt adhesive composition of claim 1 wherein the second propylene-based polymer has a viscosity at 190° C. of no greater than about 2,000 cps.
8. The hot melt adhesive composition of claim 1 wherein the second propylene-based polymer is present at from about 7% to about 20% by weight.
9. The hot melt adhesive composition of claim 1 further comprising a third polymer.
10. The hot melt adhesive composition of claim 9 wherein the first propylene-based copolymer, second propylene-based polymer, third polymer, first tackifying agent and plasticizer makes up at least 90% of the adhesive composition.
11. The hot melt adhesive composition of claim 1 wherein the total of the first propylene-based copolymer and the second propylene based polymer is no less than about 10% by weight.
12. The hot melt adhesive composition of claim 1 having a viscosity of from about 3,000 cps to about 20,000 cps at 177° C.
13. The hot melt adhesive composition of claim 1 having a creep (37.8° C., 4 hours) of no greater than 35%.