Physical blends of polyethylenes

Details Physical blends of polyethylenes Physical blends of polyethylenes

2007-07-31

2007-07-31

Seidleck, James J. (Department: 1711)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

C525S245000, C525S191000, C526S110000, C526S104000, C526S352000, C428S516000, C428S517000

Reexamination Certificate

active

10493142

ABSTRACT:
This invention discloses a process for the preparation of polyethylene resins having a narrow molecular weight distribution that comprises the steps of: (i) providing a first high molecular weight metallocene-produced linear low density polyethylene (mLLDPE) resin having a density of from 0.920 to 0.940 g/cm3and a MI2 of from 0.05 to 2 g/10 min; (ii) providing a second high density polyethylene (HDPE) prepared either with a Ziegler-Natta or with a metallocene catalyst, said polyethylene having a density ranging from 0.950 to 0.970 g/cm3and a MI2 of from 0.5 to 10 g/10 min; (iii) physically blending together the first and second polyethylenes to form a polyethylene resin having a narrow molecular weight distribution, a density ranging from 0.940 to 0.955 g/cm3and a MI2 of from 1 to 2 g/10 min.

REFERENCES:
patent: 5707751 (1998-01-01), Garza et al.
patent: 6010792 (2000-01-01), Lind et al.
patent: 6346575 (2002-02-01), Debras et al.
patent: 2002/0065368 (2002-05-01), Debras et al.
patent: 2002/0099140 (2002-07-01), Debras et al.
patent: WO 9729152 (1997-08-01), None

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