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US 9,174,377 B2Granted
Multilayer blown films for shrink applications
AssigneeChevron Phillips Chemical Company LP
InventorsClifford C. Pettey, Charlie Rees
Life of this patent
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Abstract
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.
Claims29
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;
- and
- a ratio of Mw/Mn in a range from about 5 to about 30.
10 more elements
A multilayer blown film comprising:
- (a) a core layer having a first side and a second side, the core layer comprising an ethylene/α-olefin polymer;
- and
- (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 has an average film thickness in a range from about 0.5 to about 10 mils;
- the multilayer blown film is not a tenter frame, double bubble, or machine direction oriented film;
- and
- the ethylene/α-olefin 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;
- and
- a ratio of Mw/Mn in a range from about 5 to about 30.
12 more elements
Dependencies are inferred from the claim text.