Oriented, heat sealable multi-layered film

Claim 1

A multi-layer film structure comprising coextruded, oriented heat sealable film comprising: (a) at least one heat sealable layer consisting of a random copolymer and/or a terpolymer compounded with an effective amount of a finely divided anti-blocking agent comprising particulate inorganic materials having mean particle sizes from about 0.5 to about 5 microns present in amounts from about 0.05% to about 0.5% by weight of the heat sealable layer but substantially devoid of silicone oil, the exposed suface of which is thereafter treated with a coefficient of friction reducing amount of silicone oil transferred thereto through contact of said exposed surface with a silicone oil containing heat sealable layer; (b) a core layer derived from isotactic polypropylene containing an effective amount of an anti-static agent comprising a suitable tertiary amine and/or a glyceride selected from the group consisting glyercol monostearate and/or a mixture of said amine and said glyercide and /or; (c) at least one heat sealable layer derived from a group consisting of random copolymers and/or terpolymers, said polymers being compounded with an effective amount of said anti-blocking agent and an amount of silicone oil sufficient to maintain a low coefficient of friction on layer (c) and also on the exposed surface of layer (a) following mutual contact of said surfaces whereby said film possesses a low coefficient of friction, excellent anti-static behavior and good optical clarity in comparison to film structures not having the described heat sealable layers in combination with the described additive materials.