Multilayer thermoplastic film with improved puncture resistance performance

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United States of America Patent

PATENT NO 11999139
APP PUB NO 20220266574A1
SERIAL NO

17264390

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Abstract

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The present disclosure provides for a heat-shrinkable, biaxially stretched, multilayer thermoplastic film that includes at least a puncture resistant layer. The puncture resistant layer is formed with a polyethylene based plastomer having a density of 0.890 g/cm3 to 0.910 g/cm3 as measured in accordance with ASTM D-792, and a melt index (MI) as measured by ASTM D-1238 at 190° C./2.16 kg from 0.20 g/10 minutes to 1.5 g/10 minutes. The polyethylene based plastomer has a logM25% of an upper 25% of a GPC quadrant having a value of 5.1 to 5.7, an intermediate molecular weight distribution (Mw/Mn) of 2.5 to 3, a Mz/Mw value of 2 to 2.5, a Comonomer Distribution Constant value from 60 to 400 and a single SCBD peak between 40-85° C. with a mass fraction of less than 3% above 85° C. as determined by CEF, and a ZSVR value from 1.0 to 5.5. The multilayer thermoplastic film is biaxially stretched at a temperature of 60° C. to 120° C. with a blow-up ratio from 2:1 to 10:1.

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Patent Owner(s)

Patent OwnerAddress
DOW GLOBAL TECHNOLOGIES LLC2040 DOW CENTER MIDLAND MI 48674

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Biswas, Sanjib Pearland, US 31 320
deGroot, Jacquelyn A Sugar Land, US 35 791
Gillespie, David T Pearland, US 36 226
Mazzola, Nicolas Cardoso Jundiai, BR 27 35

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