Multilayer shrink film with polystyrene and polyethylene layers
First Claim
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1. A five layer shrink film comprising:
- a first outer polyethylenic layer;
a second outer polyethylenic layer;
a core polystyrenic layer;
a first polystyrene compatibilizing layer between the core polystyrenic layer and the first outer polyethylenic layer; and
a second polystyrene compatibilizing layer between the core polystyrenic layer and the second outer polyethylenic layer;
wherein the polystyrene compatabilizing layers comprise less than 1% by weight substantially random interpolymer.
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Abstract
A multilayer shrink film and methods of making same comprising one or more polyethylenic layers, one or more polystyrenic layer and polystyrene compatibilizing layers situate between each polyethylenic layer and polystyrenic layer wherein the polystyrene compatibilizing layers comprise less than 1% by weight substantially random interpolymer. The multilayer shrink films of the invention are produced using film biaxial orienting means.
33 Citations
26 Claims
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1. A five layer shrink film comprising:
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a first outer polyethylenic layer;
a second outer polyethylenic layer;
a core polystyrenic layer;
a first polystyrene compatibilizing layer between the core polystyrenic layer and the first outer polyethylenic layer; and
a second polystyrene compatibilizing layer between the core polystyrenic layer and the second outer polyethylenic layer;
wherein the polystyrene compatabilizing layers comprise less than 1% by weight substantially random interpolymer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of forming a five layer shrink film comprising two outer most polyethylenic layers, an innermost polystyrenic layer and a polystyrene compatibilizing layer situate between each outermost polyethylenic layer and the core polystyrenic layer comprising less than 1% by weight substantially random interpolymer, the method comprising of:
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feeding individual layer compositions into 3 or more separate extruders;
extruding the compositions simultaneously into a biaxial film orienting means; and
biaxially orienting the film to a thickness of 40 to 100 gauge;
wherein a separate extruder extrudes a single homogenous composition. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A five layer shrink film comprising:
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a first outer polystyrenic layer;
a second outer polystyrenic layer;
a core polyethylenic layer;
a first polystyrene compatibilizing layer between the core polyethylenic layer and the first outer polystyrenic layer; and
a second polystyrene compatibilizing layer between the core polyethylenic layer and the second outer polystyrenic layer;
wherein the polystyrene compatabilizing layers comprise less than 1% by weight substantially random interpolymer. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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25. A five layer shrink film comprising:
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a first outer polyethylenic layer comprising 15 to 25% by weight of the film;
a second outer polyethylenic layer comprising 15 to 25% by weight of the film;
a core polystyrenic layer comprising 30 to 50% by weight of the film;
a first polystyrene compatibilizing layer between the core polystyrenic layer and the first outer polyethylenic layer comprising 10 to 25% by weight of the film;
a second polystyrene compatibilizing layer between the core polystyrenic layer and the second outer polyethylenic layer comprising 10 to 25% by weight of the film;
wherein the polystyrene layer comprise 70% to 90% polystyrenic polymer;
from 10% to 15% polystyrene toughener and from 5% to 6% slip additive, by weight of the layer;
wherein the polystyrene compatabilizing layers comprise less than 1% by weight substantially random interpolymer; and
wherein the polystyrene compatabilizing layers comprise 5% to 20% anhydride-modified ethylene vinyl acetate, by weight of the layer.
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26. A five layer shrink film comprising:
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a first outer polyethylenic layer comprising 15 to 25% by weight of the film;
a second outer polyethylenic layer comprising 15 to 25% by weight of the film;
a core polystyrenic layer comprising 30 to 50% by weight of the film;
a first polystyrene compatibilizing layer between the core polystyrenic layer and the first outer polyethylenic layer comprising 10 to 25% by weight of the film;
a second polystyrene compatibilizing layer between the core polystyrenic layer and the second outer polyethylenic layer comprising 10 to 25% by weight of the film;
wherein the polystyrene layer comprise 70% to 90% polystyrenic polymer;
from 10% to 15% polystyrene toughener and from 5% to 6% slip additive, by weight of the layer;
wherein the polystyrene compatabilizing layers comprise less than 1% by weight interpolymer; and
wherein the polystyrene compatabilizing layers comprise 5% to 20% styrene-ethylene butylene-styrene block copolymer.
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Specification