Pelicula de multicapas que tiene un espesor de 250 micrones o menos que comprende una capa de nucleo que constituye 20-90% del espesor de la pelicula y que contiene 10-95% en peso de al menos un biopolimero termoplastico y de 5-90% de una poliolefina, y una capa exterior situada adyacente a la capa que contiene 50% o mas de una poliolefina

摘要

A film that contains a core layer positioned adjacent to an outer layer is provided. The core layer contains a relatively high percentage of thermoplastic biopolymers that are both biodegradable and renewable. Despite being biodegradable and renewable, many biopolymers tend to be relatively stiff in nature. The present inventors have discovered, however, that through selective control over the components in the core and outer layers, a film can be readily formed having good mechanical properties. Among other things, this is accomplished by blending the biopolymer in the core layer with a polyolefin. A polyolefin is also employed in the outer layer. In addition to providing functionality to the film (e.g., heat sealing, printing, etc.), the polyolefin-containing outer layer also helps counteract the stiffness of the biopolymer in the core layer, and helps improve processability, stiffness, and ductility.