Hot melt adhesive composition
A hot melt adhesive composition that includes a first ethylene alpha-olefin copolymer having a density of no greater than 0.90 grams per cubic centimeter, a second styrene block copolymer, tackifying agent, synthetic wax having a melt temperature of at least 70° C. and a heat of fusion of at least 200 Joules/gram, and a third polymer selected from the group consisting of ethylene-polar comonomer copolymer derived from at least 90 mole % ethylene and no greater than 10 mole % co-monomer, propylene-alpha-olefin copolymer derived from at least 8 mole % co-monomer, exhibiting a heat of fusion of from at least 5 J/g to no greater than 60 J/g, and having a polydispersity index of no greater than 10, and propylene homopolymer exhibiting a heat of fusion of from at least 5 J/g to no greater than 60 J/g.
1. A hot melt adhesive composition comprising:
a first copolymer comprising an ethylene alpha-olefin copolymer having a density of no greater than 0.90 grams per cubic centimeter (g/cm 3 );
a second copolymer comprising styrene block copolymer;
tackifying agent;
synthetic wax having a melt temperature of at least 70° C. and a heat of fusion of at least 200 Joules/gram (J/g); and
at least 5% by weight ethylene vinyl acetate, the ethylene vinyl acetate being derived from at least 90 mole % ethylene and no greater than 8 mole % vinyl acetate.
2. The hot melt adhesive composition of claim 1 , wherein the synthetic wax is a wax derived from ethylene, a Fischer Tropsch wax, or a combination thereof.
3. The hot melt adhesive composition of claim 1 , wherein the composition exhibits a set time of no greater than 1 second.
4. The hot melt adhesive composition of claim 1 , wherein the composition exhibits a set time of no greater than 0.8 seconds.
5. The hot melt adhesive composition of claim 1 , wherein the composition exhibits a viscosity of no greater than 1500 cP at 177° C.
6. The hot melt adhesive composition of claim 1 , wherein the composition exhibits a viscosity of no greater than 1500 cP at a temperature of no greater than 135° C.
7. The hot melt adhesive composition of claim 1 , wherein the composition exhibits a viscosity of no greater than 1500 cP at 121° C.
8. The hot melt adhesive composition of claim 1 comprising
from 5% by weight to 25% by weight of the ethylene alpha-olefin copolymer,
from 2% by weight to 15% by weight styrene block copolymer,
from 15% by weight to 50% by weight tackifying agent,
from 10% by weight to 35% by weight of the synthetic wax, and
from 5% by weight to 25% by weight of the ethylene vinyl acetate.
9. The hot melt adhesive composition of claim 1 , wherein the styrene block copolymer comprises styrene-isoprene-styrene, styrene-butadiene-styrene, styrene-ethylene-propylene-styrene, styrene-ethylene-butylene-styrene, styrene-ethylene-ethylene-propylene-styrene, or a combination thereof.
10. The hot melt adhesive composition of claim 1 , wherein the styrene block copolymer comprises styrene-ethylene-butylene-styrene.
11. The hot melt adhesive composition of claim 1 , wherein the styrene block copolymer is derived from less than 35% by weight styrene.
12. The hot melt adhesive composition of claim 1 , wherein the ethylene vinyl acetate is derived from less than 20% by weight vinyl acetate.
13. The hot melt adhesive composition of claim 1 , wherein the composition exhibits a peel adhesion failure temperature of at least 50° C.
14. The hot melt adhesive composition of claim 1 , wherein the composition exhibits at least 50% fiber tear at −29° C.
15. The hot melt adhesive composition of claim 1 , wherein the composition is homogeneous when tested according to the Clarity and Homogeneity Test Method.
16. A hot melt adhesive composition comprising:
a first copolymer comprising an ethylene alpha-olefin copolymer having a density of no greater than 0.90 grams per cubic centimeter (g/cm 3 );
a second copolymer comprising styrene block copolymer;
tackifying agent;
synthetic wax having a melt temperature of at least 70° C. and a heat of fusion of at least 200 Joules/gram (J/g); and
at least 5% by weight ethylene-polar comonomer copolymer derived from at least 90 mole % ethylene and no greater than 10 mole % polar co-monomer, the ethylene-polar comonomer copolymer comprising ethylene alkyl-acrylate,
the hot melt adhesive composition exhibiting a set time of no greater than 0.8 seconds.
17. The hot melt adhesive composition of claim 16 , wherein the ethylene-polar comonomer copolymer is selected from the group consisting of ethylene methyl acrylate, ethylene n-butyl acrylate, and combinations thereof.
18. The hot melt adhesive composition of claim 16 , wherein the ethylene-polar comonomer copolymer is ethylene-n-butyl acrylate.
19. The hot melt adhesive composition of claim 18 , wherein the ethylene n-butyl acrylate is derived from less than 30% by weight n-butyl acrylate.
20. The hot melt adhesive composition of claim 19 , wherein the styrene block copolymer is derived from less than 35% by weight styrene.
21. A hot melt adhesive composition comprising:
a first copolymer comprising an ethylene alpha-olefin copolymer having a density of no greater than 0.90 grams per cubic centimeter (g/cm 3 );
a second copolymer comprising styrene block copolymer;
tackifying agent;
synthetic wax having a melt temperature of at least 70° C. and a heat of fusion of at least 200 Joules/gram (J/g); and
at least 5% by weight of a third polymer selected from the group consisting of
propylene-alpha-olefin copolymer derived from at least 8 mole % co-monomer, having a heat of fusion of from at least 5 J/g to no greater than 60 J/g, and a polydispersity index of no greater than 10, and
propylene homopolymer having a heat of fusion of from at least 5 J/g to no greater than 60 J/g.
22. The hot melt adhesive composition of claim 16 comprising
from 5% by weight to 25% by weight of the ethylene alpha-olefin copolymer,
from 2% by weight to 15% by weight styrene block copolymer,
from 15% by weight to 50% by weight tackifying agent,
from 10% by weight to 35% by weight of the synthetic wax, and
from 5% by weight to 25% by weight of the ethylene-polar comonomer copolymer.
23. The hot melt adhesive composition of claim 1 , wherein the composition exhibits at least 80% fiber tear at −29° C.