Polymerization catalyst system utilizing external donor...

Details Polymerization catalyst system utilizing external donor... Polymerization catalyst system utilizing external donor...

2008-09-02

2008-09-02

Choi, Ling-Siu (Department: 1796)

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S348000, C526S124300, C526S124900, C526S348100, C502S116000, C502S103000, C556S470000

Reexamination Certificate

active

11820450

ABSTRACT:
External donor systems, catalyst systems and olefin polymerization processes are described herein. The external donor systems generally include a first external donor represented by the general formula SiR2m(OR3)4-m, wherein each R2is independently selected from alkyls, cycloalkyls, aryls and vinyls, each R3is independently selected from alkyls and m is from 0 to 4. The external donor systems further include a second external donor represented by the general formula SiR4m(OR5)4-m, wherein each R4is independently selected from alkyls, cycloalkyls, aryls and vinyls, each R5is independently selected from alkyls, m is from 0 to 4 and at least one R4is a C3or greater alkyl.

REFERENCES:
patent: 6133385 (2000-10-01), Shamshoum et al.
patent: 2002/0119888 (2002-08-01), Miro

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