Polyolefin oil resistant film using high isotactic content polypropylene

A coextruded multilayer film, comprising of at least:

• a high crystalline propylene homopolymer resin layer of isotactic content greater than about 95%;
• a discharge-treated surface on one side of said polyolefin resin layer;
• an amount of hydrocarbon resin up to 10% by weight of the high crystalline propylene homopolymer of greater than about 95% isotactic content;
• and
• on the high crystalline propylene homopolymer resin layer side opposite said discharge-treated surface, a heat sealable layer or winding layer comprising an antiblock comprising a material selected from the group consisting essentially of amorphous silicas, aluminosilicates, sodium calcium aluminum silicate, and a polymeric antiblock.

A metallized polyolefinic multi-layer film comprising at least:

• a high crystalline propylene homopolymer resin layer of isotactic content greater than about 95%;
• a discharge-treated surface on one side of said polyolefin resin layer;
• on the high crystalline propylene homopolymer resin layer side opposite said discharge-treated surface, a heat sealable layer or winding layer comprising a antiblock comprising a material selected from the group consisting essentially of amorphous silicas, aluminosilicates, sodium calcium aluminum silicate, and a polymeric antiblock;
• a metal layer vapor-deposited on the discharge-treated side of the high crystalline propylene homopolymer core resin layer opposite the heat sealable or winding layer;
• wherein the film has good or excellent resistance to film distortion that is caused by the absorption of food oils.