Shrink films
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United States of America Patent
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Oct 24, 2017
Grant Date -
Jan 19, 2017
app pub date -
Jul 7, 2016
filing date -
Jul 17, 2015
priority date (Note) -
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Abstract
Films suitable for shrink film applications are disclosed comprising at least one heterogeneous ethylene interpolymer having a short chain branching distribution profile index, DPISCB, that satisfies the formula: −1≦DPISCB≦1. The at least one heterogeneous ethylene interpolymer has a density from about 0.911 g/cm3 to about 0.942 g/cm3, a melt index from about 0.2 dg/min to about 3.5 dg/min and is produced using an in-line Ziegler-Natta catalyst. Additional embodiments include shrink films prepared from blends of at least one heterogeneous ethylene interpolymer and at least one high pressure ethylene polymer. The disclosed shrink films have improved puncture strength and machine direction shrink tunnel shrink force relative to control shrink films of the same composition but the control heterogeneous ethylene interpolymer, produced with a batch Ziegler-Natta catalyst, has a DPISCB greater than 1.0.
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