Abstract:
A tie layer adhesive composition for multilayer structures made up of graft composition compounded with a base resin, such as linear low density polyethylene (LLDPE), and a polyethylene having long chain branching, such as low density polyethylene (LDPE), and optionally one or more additives. The graft composition can be made up of a blend of a grafted polyolefin and an olefin elastomer and/or the reaction product of a live, grafted polyolefin and an olefin elastomer.
Abstract:
Graft compositions, useful for tie-layer adhesives, are disclosed. The graft compositions comprise the reaction product of a live, grafted polyolefin and an olefin elastomer. The grafted polyolefin is first made by heating a polyolefin and an unsaturated monomer. Further reaction of the live, grafted polyolefin with an olefin elastomer provides the graft composition. Grafting efficiency is boosted dramatically by the presence of the olefin elastomer and use of the additional reaction step. The graft composition, when formulated into a tie-layer adhesive at low concentration, affords multilayer structures with good adhesion and high clarity.
Abstract:
An oriented multilayer structure for shrink applications having a polymeric layer, a tie layer adhered to said polymeric layer. The tie layer is made up of the reaction product of a live, grafted polyolefin and an olefin elastomer. The multilayer structure is oriented and the tie layer provides strong adhesion to barrier layers even at high orientation levels.
Abstract:
Tie-layer adhesives having graft compositions for bonding to metal substrates is disclosed. The graft compositions are made up of the reaction product of a live, grafted polyolefin and an olefin elastomer. The grafted polyolefin is first made by heating a polyolefin and an unsaturated monomer. Further reaction of the live, grafted polyolefin with an olefin elastomer provides the graft composition. Grafting efficiency is boosted dramatically by the presence of the olefin elastomer and use of the additional reaction step. The graft composition, when formulated into a tie-layer adhesive provides improved bonding to metal substrates.
Abstract:
Disclosed is an adhesive composition. The adhesive composition comprises a maleated polyolefin and an LLDPE. The LLDPE is made by a Ziegler-Natta catalyst which comprises a MgCl 2 support, a Ti(IV) complex, and an electron donor. The catalyst has an Mg/Ti molar ratio greater than or equal to 7. Preferably, the Ti(IV) complex is TiCl 4 , and the electron donor is tetrahydrofuran. Preferably, the adhesive comprises from 35 to 95 wt% of the LLDPE and 5 to 65 wt% of maleated polyolefin.
Abstract:
A process for producing a multilayer structure is provided whereby an adhesive layer having a first side and a second side is contacted on its first side with a metal layer, having a first side and a second side, at a temperature of 325°F to 425°F for a contact time of 0.5 to 5.0 seconds, thereby adhering the adhesive layer to the metal layer. The adhesive layer comprises an ethylene- G 4-8 α-olefin linear low density copolymer; a polymer grafted with an ethylenicaliy unsaturated carboxylic acid or acid derivative; and a styrene-butadiene-styrene triblock copolymer having an MI of 5 to 50.