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 comprising from 70% to 75% by weight styrene homopolymer or α
-methylstyrene homopolymer, from 10% to 15% by weight polystyrene toughener, from 10% to 20% by weight adhesive resin, and from 5% to 6% by weight slip additive;
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.
29 Citations
11 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 comprising from 70% to 75% by weight styrene homopolymer or α
-methylstyrene homopolymer, from 10% to 15% by weight polystyrene toughener, from 10% to 20% by weight adhesive resin, and from 5% to 6% by weight slip additive;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, 9)
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10. 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, the polystyrenic layer comprising from 70% to 75% by weight of the layer styrene homopolymer or α
-methylstyrene homopolymer, from 10% to 15% by weight of the layer polystyrene toughener, from 10% to 20% by weight of the layer adhesive resin, and from 5% to 6% by weight of the layer slip additive;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 first and second polystyrene compatabilizing layers comprise less than 1% by weight substantially random interpolymer; and wherein each of the first and second polystyrene compatabilizing layers comprise 5% to 20% by weight of the layer anhydride-modified ethylene vinyl acetate.
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11. 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 polystyrenic layer comprises 70% to 75% by weight of the layer styrene homopolymer or α
-methylstyrene homopolymer, 10% to 15% by weight of the layer polystyrene toughener, 10% to 20% by weight of the layer adhesive resin and from 5% to 6% by weight of the layer slip additive;wherein the first and second polystyrene compatabilizing layers together comprise less than 1% by weight interpolymer; and wherein the first and second polystyrene compatabilizing layers each comprise 5% to 20% by weight of the layer styrene-ethylene butylene-styrene block copolymer.
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Specification