Process for preparing a simulated in situ polyethylene blend
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United States of America Patent
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Nov 26, 2002
Grant Date -
N/A
app pub date -
Dec 3, 1996
filing date -
Dec 3, 1996
priority date (Note) -
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Abstract
A process comprising: (i) providing a first polyethylene, prepared independently, having a melt index in the range of about 5 to about 3000 grams per 10 minutes and a density in the range of about 0.900 to about 0.975 gram per cubic centimeter and a second polyethylene, prepared independently, having a flow index in the range of about 0.01 to about 30 grams per 10 minutes and a density in the range of about 0.860 to about 0.940 gram per cubic centimeter, the weight ratio of the first polyethylene to the second polyethylene being in the range of about 75:25 to about 25:75; (ii) blending the first polyethylene with the second polyethylene; (iii) melting the blend; and, prior to extrusion or pelletizing, (iv) passing the molten blend through one or more active screens, in the case of two or more active screens, positioned in series, each active screen having a micron retention size in the range of about 2 to about 70, at a mass flux of about 5 to about 100 pounds per hour per square inch.
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