Pretreated and prepolymerized polyolefin catalyst,...

Details Pretreated and prepolymerized polyolefin catalyst,... Pretreated and prepolymerized polyolefin catalyst,...

2008-04-29

2008-04-29

Lu, Caixia (Department: 1796)

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S075000, C526S123100, C526S124700, C502S115000, C502S132000

Reexamination Certificate

active

11031587

ABSTRACT:
A method of modifying a Ziegler-Natta type polyolefin catalyst comprises contacting the Ziegler-Natta catalyst with olefin monomer to form a prepolymerized catalyst. The prepolymerized catalyst can comprise a reduced number of catalyst particles having a size of 40 microns or less. The prepolymerized catalyst can be used in a polymerization process to produce polymer fluff particles with a reduced number of polymer fluff fines than the Ziegler-Natta type catalyst.

REFERENCES:
patent: 5494871 (1996-02-01), Brun et al.
patent: 5817591 (1998-10-01), Shamshoum

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