Flexible Film Composition for Heat Seals and Container with Same

摘要

The present disclosure is directed to compositions and film structures suitable for heat seal production. The heat sealable flexible film structure includes: a layer (A) comprising a propylene-based plastomer or elastomer (“PBPE”) and a low density polyethylene; a layer (B), adjacent to layer (A), comprising at least 50 percent by weight of the layer (B) of an ethylene-based polymer; and an outermost layer (C) comprising a material having a melting point greater than 140° C. Weight percents are based on the total weight of the respective layer. The heat sealable flexible film structure is used to make a flexible container (10) having one or more heat seals (12). The heat seal (12) can be a frangible heat seal, a hard heat seal, or a combination thereof.

主权项

1. A heat sealable flexible film structure comprising:
a layer (A) comprising from 35 to 80 percent by weight of the layer (A) of a propylene based plastomer or elastomer (“PBPE”) comprising a propylene/ethylene copolymer and from 20 to 65 percent by weight of layer (A) of a low density polyethylene having a density in the range of form 0.915 g/cm3 to 0.935 g/cm3; a layer (B), adjacent to layer (A), comprising a polyolefin-based polymer selected from the group consisting of (i) a Ziegler-Natta catalyzed ethylene copolymer comprising units derived from ethylene and one or more α-olefins having from 3 to 10 carbon atoms; (ii) a metallocene catalyzed ethylene copolymer comprising units derived from ethylene and one or more α-olefins having from 3 to 10 carbon atoms; (iii) a Ziegler-Natta catalyzed ethylene homopolymer; (iv) a metallocene catalyzed ethylene homopolymer, (v) a low density polyethylene, and combinations thereof; and an outermost layer (C) comprising a material having a melting point greater than 140° C.