Low application temperature hot melt adhesive
View Patent ↗High temperature performance hot melt adhesives are formulated for application at low temperature, i.e., below 300° F. Hot melt adhesive formed with metallocene polymer together with a maleated polyethylene wax show an excellent balance of high and low temperature performance and are particularly useful as packaging case and carton adhesive.
1. A low application temperature hot melt adhesive comprising a polyolefin copolymer component and a maleated polyethylene wax component,
wherein said polyolefin copolymer component comprises two different polyolefin copolymers comprising:
(A) a first polyolefin copolymer that (i) is a metallocene-catalyzed ethylene/α-olefin copolymer prepared from ethylene and 1-octene monomers, and (ii) has a Melt Index of greater than about 400 g/10 min at 190° C.; and
(B) a second polyolefin copolymer that (i) has at least about 50 mol % of ethylene content and (ii) has a Melt Index less than about 35 g/10 min at 190° C.
2. The adhesive of claim 1 wherein the first polyolefin copolymer has a Melt Index greater than about 500 g/10 min at 190° C.
3. The adhesive of claim 1 , wherein the second polyolefin copolymer is an ethylene-octene-based olefin block copolymer.
4. The adhesive of claim 1 , wherein the second polyolefin copolymer is a random ethylene-octene-based copolymer.
5. The adhesive of claim 1 further, wherein the second polyolefin copolymer comprises at least 60 mol % of ethylene content.
6. The adhesive of claim 1 further, wherein the second polyolefin copolymer is a metallocene-catalyzed polymer.
7. The adhesive of claim 3 wherein the ethylene-octene-based olefin block copolymer has a melting point of 118-122° C.
8. The adhesive of claim 4 , the random ethylene-octene-based copolymer has a melting point of 38-104° C.
9. A low application temperature hot melt adhesive comprising less than 30 wt % of by weight of a polyolefin copolymer component and less than 10% by weight of a maleated polyethylene wax component;
wherein the polyolefin copolymer component comprises two polyolefin copolymers;
wherein the first polyolefin copolymer (1) is a metallocene-catalyzed ethylene/α-olefin copolymer prepared from ethylene and 1-octene monomers; and (2) has a Melt Index of greater than about 400 g/10 min at 190° C., and
wherein the adhesive has a viscosity at 120° C. of below about 3000 centipoises.
10. The adhesive of claim 9 comprising from 25 to 30 wt % of said polyolefin copolymer component and from 5-10 wt % of said maleated polyethylene wax component.
11. The adhesive of claim 10 further comprising a wax component different from said maleated polyethylene wax component.
12. A packaged article comprising the hot melt adhesive of claim 9 , which is a carton, case, tray or bag.
13. The packaged article of claim 12 which is a packaged food article.