Olefinic polymer and process for producing the same

Details Olefinic polymer and process for producing the same Olefinic polymer and process for producing the same

2006-05-02

2006-05-02

Lu, Caixia (Department: 1713)

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S160000, C526S089000, C526S348200, C526S943000

Reexamination Certificate

active

07037998

ABSTRACT:
The olefinic polymer characterised in that the n-decane-soluble content thereof is 10% by weight or less and the content of a ligand having a cyclopentadienyl structure is 5 ppb by weight or less. The process for producing an olefinic polymer is a process of producing an olefinic polymer by (co)polymerizing olefins in a gas phase using a fluidized-bed reactor, the process comprising: a polymerization step of (co)polymerizing the olefins with allowing a saturated aliphatic hydrocarbon to exist in a concentration of 2 to 30 mol % in the fluidized-bed reactor and a ligand removing step involving a step of bringing the resulting (co)polymer into contact with a ligand-remover and a step of heating said (co)polymer which has been brought into contact with the ligand-remover.

REFERENCES:
patent: 5371053 (1994-12-01), Agapiou et al.
patent: 5990272 (1999-11-01), Yamamoto et al.
patent: 2002/0198341 (2002-12-01), Takahashi
patent: 0 808 850 (1997-11-01), None
patent: 10-045824 (1998-02-01), None
patent: WO 01/77193 (2001-10-01), None

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