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US 9,422,425 B2Granted
Polyethylene with high melt strength for use in films
AssigneesDow Global Technologies LLC, Dow Brasil S.A.
InventorsTeresa P. Karjala, Nicolas Cardoso Mazzola, Mehmet Demirors, Jorge Caminero Gomes, Michael A. Terrasa
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Abstract
The present invention is a method for producing a film particularly well suited for shrink film applications, said method comprising the steps of selecting a target polyethylene resin and then increasing the melt strength of the polyethylene resin by reacting the polyethylene resin with an alkoxy amine derivative, and then forming a film from the reacted target polyethylene.
Claims16
A method for producing film, said method comprising the steps of:
- a) blending an alkoxy amine derivative with a low density polyethylene to form a masterbatch;
- b) selecting a target polyethylene resin having a density as determined according to ASTM D792, in the range of from 0.92 g/cm3 to 0.94 g/cm3, and a melt index, as determined according to ASTM D1238 (2.16 kg, 190° C.), in the range of from 0.01 g/10 min to 10 g/10 min;
- where the target polyethylene is a linear low density polyethylene;
- c) blending the masterbatch with the target polyethylene in an amount and under conditions sufficient to increase the melt strength of the polyethylene resin;
- where the amount of the alkoxy amine derivative is less than 900 parts per million based on a weight of total polyethylene resin;
- and
- d) blending a composition of c) with 10 to 90 percent by weight of a low density polyethylene composition to form a blend d) that contains the alkoxy amine derivative in an amount of 1 to 400 ppm;
- e) forming a film from the blend d).
5 more elements
A film comprising:
- a) from 10 to 90 percent by weight of a polyethylene polymer made by the process of:
- i) selecting a target polyethylene resin having a density, as determined according to ASTM D792, in the range of from 0.92 g/cm3 to 0.94 g/cm3, and a melt index, as determined according to ASTM D1238 (2.16 kg, 190° C.), in the range of from 0.01 g/10 min to 10 g/10 min;
- where the target polyethylene is a linear low density polyethylene;
- ii) blending an alkoxy amine derivative with a low density polyethylene to form a masterbatch;
- iii) blending the masterbatch with the target polyethylene in an amount and under conditions sufficient to increase the melt strength of the polyethylene resin, where the amount of the alkoxy amine derivative is less than 900 parts per million based on a weight of total polyethylene resin;
- and
- b) adding from 10 to 90 percent by weight of a low density polyethylene composition to a blend obtained in iii) to form a composition that contains the alkoxy amine derivative in an amount of 1 to 400 ppm.
4 more elements
Dependencies are inferred from the claim text.