Surface-treated multi-layered polymer film

Abstract

A sealable polymeric film structure comprising (a) a core layer including a thermoplastic polymer, the core layer having a machine side and a product side that is on a side of the film opposite from the machine side; and (b) a sealable skin layer positioned on the product side of the core layer, the sealable skin layer including a thermoplastic polymer, wherein an exterior surface of the sealable skin layer has a receding Cahn value of at least about 0.48; and wherein in some heat—sealable embodiments, the sealable skin layer sealed to itself has a MST of from about 175° F. to about 220° F., with a jaw pressure of 20 psi for 0.75 seconds and a minimum acceptable seal strength of 200 g / in at 175° F., on a Wrap-Ade™ Crimp Sealer Model J or K.

Description

CROSS-REFERENCE OF RELATED APPLICATIONS

[0001] This application claims benefit of priority to Provisional U.S. Application No. 60 / 613,157 filed Sep. 24, 2004 and is incorporated herein by reference.FIELD OF THE INVENTION

[0002] This invention relates to polymer films, such as are useful for packaging films. More particularly it relates to heat sealable, biaxially-oriented film structures that are surface treated on the sealing surface. In preferred embodiments, the film is a multilayer film. BACKGROUND OF THE INVENTION

[0003] Multilayer polymeric films are commonly used for packaging products such as snack foods, including candies, potato chips, cookies, ice cream bars and dairy products. The versatility and compositional variation of polymer films facilitate usefulness in a variety of packaging applications. A wide array of film compositions are available today due to custom tailoring a multitude of variables related to polymer composition, additives, and method of preparation of t...