Preparation of multimodal polyethylene

Details Preparation of multimodal polyethylene Preparation of multimodal polyethylene

2008-12-04

2010-12-21

Lipman, Bernard (Department: 1762)

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

Synthetic resins

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

Reexamination Certificate

active

07855255

ABSTRACT:
Disclosed is a polyethylene composition. The composition comprises single-site multimodal resin A and single-site multimodal resin B, wherein resin A differs from resin B in molecular weight, in monomeric composition, in density, in long chain branch concentration or distribution, or in combinations thereof. Disclosed is also a method for making the polyethylene composition. The method comprises polymerizing, in the presence of two or more single-site catalysts, ethylene or its mixture with a C3-C10α-olefin to form a first multimodal resin and continuing the polymerization in the presence of the same catalysts but in a different hydrogen concentration, in a different monomer composition, or at a different temperature to form a second multimodal resin.

REFERENCES:
patent: 5149738 (1992-09-01), Lee et al.
patent: 5371053 (1994-12-01), Agapiou et al.
patent: 5442019 (1995-08-01), Agapiou et al.
patent: 5464905 (1995-11-01), Tsutsui et al.
patent: 5747594 (1998-05-01), deGroot et al.
patent: 6211311 (2001-04-01), Wang et al.
patent: 6232260 (2001-05-01), Nagy et al.
patent: 6372864 (2002-04-01), Brown
patent: 6545105 (2003-04-01), Follestad et al.
patent: 6645588 (2003-11-01), Leiden et al.
patent: 6861485 (2005-03-01), Wang
patent: 2001/0039314 (2001-11-01), Mehta et al.
patent: 2004/0242785 (2004-12-01), Palmlof
patent: 2004/0259722 (2004-12-01), Wang
patent: 2005/0137337 (2005-06-01), Kwalk
patent: 770 629 (1997-05-01), None
patent: 1878764 (2008-01-01), None
patent: WO 98/57998 (1998-12-01), None
patent: WO 2004/067654 (2004-08-01), None
R. N. Shroff and H. Mavridis, Long-Chain-Branching Index for Essentially Linear Polyethylenes,Macromolecules1999, 32, pp. 8454-8464.
Wallace W. Yau and David Gillespie, New Approaches Using MW-sensitive Detectors in GPC-TREF for Polyolefin Characterization,Polymer, vol. 42, pp. 8947-8958 (2001).

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