Hot melt adhesive compositions including olefinic polymer blends and articles including the same
View Patent ↗A hot melt adhesive composition that includes a non functionalized amorphous poly alpha olefin polymer, a second polymer selected from the group including polypropylene homopolymers, polypropylene copolymers and combinations there of, a functionalized wax and a second wax.
1. A hot melt adhesive composition comprising:
at least 55% by weight of a first polymer consisting of a non functionalized amorphous poly alpha olefin polymer comprising greater than about 50% by weight polypropylene;
a second polymer selected from the group consisting of polypropylene homopolymers, propylene copolymers, and combinations thereof;
functionalized polypropylene wax; and
polyethylene wax;
the adhesive composition having a viscosity of no greater than 2000 centipoise at 176.7° C.
2. The adhesive composition of claim 1 , wherein the non functionalized amorphous poly alpha olefin polymer has a viscosity of no greater than about 5,000 cps at 190° C.
3. The adhesive composition of claim 1 , wherein the non functionalized amorphous poly alpha olefin polymer has a viscosity of no greater than about 750 cps at 190° C.
4. The adhesive composition of claim 1 , wherein the non functionalized amorphous poly alpha olefin polymer comprises from about 60% by weight to about 85% by weight of the adhesive composition.
5. The adhesive composition of claim 1 , wherein the non functionalized amorphous poly alpha olefin polymer has a polydispersity of no less than about 4.
6. The adhesive composition of claim 1 , wherein the non functionalized amorphous poly alpha olefin polymer has a Mw of no greater than or equal to about 30,000.
7. The adhesive composition of claim 1 , wherein the second polymer is metallocene catalyzed.
8. The adhesive composition of claim 1 , wherein the second polymer has a polydispersity no greater than about 3.
9. The adhesive composition of claim 1 , wherein the polyethylene wax has a density of at least about 0.92.
10. The adhesive composition of claim 1 , wherein the functionalized polypropylene wax consists of maleic anhydride functionalized polypropylene wax.
11. The adhesive composition of claim 1 wherein the composition is free of a tackifying agent.
12. The adhesive composition of claim 1 additionally comprising a tackifying agent at no greater than about 15% by weight.
13. The adhesive composition of claim 1 , wherein the composition exhibits at least 50% fiber tear at −20° F. and at 150° F.
14. A hot melt adhesive composition comprising:
at least about 60% by weight of a first polymer consisting of a non functionalized amorphous poly alpha olefin polymer comprising greater than 55% by weight polypropylene having a viscosity at 190° C. of not more than 1500 cps;
a second polymer selected from the group consisting of polypropylene homopolymers, propylene copolymers, and combinations thereof;
functionalized wax; and
a second wax.
15. The composition of claim 14 wherein the second polymer has a polydispersity of no greater than about 3.
16. The composition of claim 14 wherein the functionalized wax is a polyethylene wax.
17. The composition of claim 14 wherein the functionalized wax is a maleated wax.
18. A method of making a construction, the method comprising:
Applying a hot melt adhesive composition comprising:
at least 55% by weight of a first polymer consisting of a non functionalized amorphous poly alpha olefin polymer comprising greater than about 50% by weight polypropylene;
a second polymer selected from the group consisting of polypropylene homopolymers, propylene copolymers, and combinations thereof;
functionalized polypropylene wax; and
polyethylene wax;
on a surface of a first substrate; and
contacting the applied adhesive composition with a second substrate
such that the first substrate is bonded to the second through the adhesive composition and the adhesive composition exhibits at least 60% fiber tear at −20° F.
19. The method of claim 18 , wherein at least one of the first and second substrates comprise at least one of paperboard, corrugated paperboard, cardboard, and coated cardboard.
20. A packaging construction made by the method of claim 18 , the packaging construction being in a form selected from the group consisting of bag, box, carton, case and tray.