Adhesive compositions based on blends of grafted polyethylenes and non-grafted polyethylenes and styrene container rubber

An adhesive composition, consisting essentially of,

• A) about 55 to 85 wt. % of a polyethylene polymeric blend selected from
• i) an unmodified polyethylene of density 0.86 to 0.97 g/cc with the proviso that an unmodified ethylene-alpha olefin within said polyethylene has a density of 0.91 to 0.97;
• and
• ii) a polyethylene of density 0.86 to 0.97 g/cc modified with an unsaturated carboxylic acid or derivative thereof;
• and
• B) about 15 to 45 wt. % of an unmodified styrene-based elastomer wherein said composition binds incompatible structural or barrier layers in a multilayer structural element having at least three structural/barrier layers and wherein the Mooney viscosity of the styrene-based elastomer is, at ML 1+4 150° C., 2-200 according to ASTM D1646.

A multilayer composite structure, comprising

• a) a polypropylene layer;
• b) an adhesive layer wherein the composition of said layer consists essentially of A) plus B), wherein:
• A) is about 55 to 85 wt. % of a polymeric blend consisting essentially of
• i) an unmodified polyethylene having a density of 0.86 to 0.97 g/cc and
• ii) a polyethylene having a density of 0.86 to 0.97 g/cc modified with an unsaturated carboxylic acid or a derivative thereof, wherein the amount of said carboxylic acid or derivative thereof is 0.01 to 3 wt. % relative to A) plus B);
• and
• B) is about 15 to 45 wt. % of a styrene-based elastomer having an immeasurable Mooney viscosity at ML 1+4 100° C. according to ASTM-D15or ASTM D1646;
• and
• c) a polymeric layer wherein the polymeric constituents of said layer are selected from polyethylene, or an ethylene/acid copolymer or an ethylene/acid ionomer or a polypropylene.