Hot Melt Adhesive With Functionalized Metallocene Catalyzed Polyolefins

摘要

A hot melt adhesive composition containing a functionalized polymer, namely, a metallocene catalyzed polyolefin elastomer grafted with maleic anhydride, together with a non-functionalized secondary polymer, namely, a metallocene catalyzed random or block polyolefin elastomer having a melt index equal to or greater than 15, a first tackifying resin having a softening point of at least 95° C., and a wax. The composition may optionally include an aromatic reinforcing resin having a softening point equal to or higher than 115° C., and a plasticizer. These hot melts provide superior hot tack, excellent adhesion, flexibility, and heat resistance above 150° F. in applications such as rigid packaging, hot fill packaging, and bottle labeling.

主权项

1. A hot melt adhesive composition, comprising a blend of the following components:
about 5% to about 50% by weight of a functionalized polymer comprising a metallocene catalyzed random polyolefin elastomer grafted with maleic anhydride; about 5% to about 70% by weight of a non-functionalized polymer comprising a metallocene catalyzed random or block polyolefin elastomer as a secondary polymer with melt index equal or greater than 15 MI; about 0% to about 30% by weight of solid or liquid plasticizer; about 5% to about 30% by weight of a wax; about 20% to about 70% by weight of a first tackifying resin having a softening point of at least about 95° C.; about 0% to about 20% by weight of an aromatic reinforcing resin having a softening point equal to or higher than 115° C.; about 0.1% to about 5% by weight of a stabilizer; and about 0% to about 3% by weight of auxilliary additives;wherein the components total 100% by weight of the composition, and the viscosity of the composition is equal to or less than about 20,000 centipoise at 163° C.