Process for producing olefinic polymer

Details Process for producing olefinic polymer Process for producing olefinic polymer

2005-02-22

2005-02-22

Cheung, William K. (Department: 1713)

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

Synthetic resins

Effecting a change in a polymerization process in response...

C526S131000, C526S139000, C526S220000, C526S310000, C526S348200, C526S348300, C526S348400, C526S348500, C526S348600, C526S348700

Reexamination Certificate

active

06858681

ABSTRACT:
The process for producing an olefinic polymer comprises introducing a saturated aliphatic hydrocarbon in a liquid phase state and in a vapor phase state into the aforementioned fluidized-bed and (co)polymerizing in the condition that when the inside radius of the cylinder section of the fluidized-bed reactor is defined as a distance of 1, the relationship between the concentration (C1) of the saturated aliphatic hydrocarbon put in a liquid state in the peripheral portion of the cylinder section at a relative distance of 0.7 to 1.0 from the center of the cylinder section as a start point and the concentration (C2) of the saturated aliphatic hydrocarbon put in a liquid state in the center portion of the cylinder section at a relative distance less than 0.7 from the center fulfills the following equation: C1>C2at a place close to the upstream section of said gas distributing plate.

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patent: 1 209 179 (2002-05-01), None
patent: WO 0238629 (2002-05-01), None

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