Multilayer blown films for shrink applications

摘要

The present invention discloses multilayer blown films for shrink label and related applications. These multilayer blown films can comprise a core layer containing an ethylene polymer, and inner and outer layers containing conjugated diene monovinylarene block copolymers.

主权项

1. A multilayer blown film comprising:
(a) a core layer having a first side and a second side, the core layer comprising an ethylene polymer; (b) an inner layer positioned on the first side of the core layer, the inner layer comprising a first conjugated diene monovinylarene block copolymer; and (c) an outer layer positioned on the second side of the core layer, the outer layer comprising a second conjugated diene monovinylarene block copolymer; wherein: the multilayer blown film has a MD shrink greater than about 60% and a CD shrink in a range from 0% to about 15% at 150° C.; the multilayer blown film is not a tenter frame, double bubble, or machine direction oriented film; and the ethylene polymer is characterized by:
a MI in a range from about 0.01 to about 2 g/10 min;a ratio of HLMI/MI in a range from about 50 to about 300; anda ratio of Mw/Mn in a range from about 5 to about 30.