Process for conditioning a gas-phase reactor to produce an ethyl

Details Process for conditioning a gas-phase reactor to produce an ethyl Process for conditioning a gas-phase reactor to produce an ethyl

1998-06-17

2000-01-04

Teskin, Fred

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526 90, 526129, 526143, 526144, 526281, 526282, 526283, 526336, 526348, 526901, C08F 234, C08F23620

Patent

active

060111283

ABSTRACT:
There is provided process for producing an ethylene-alpha-olefin polymer at a polymerization reaction temperature in excess of the softening temperature of the polymer in a gas-phase fluidized-bed reactor in the presence of a polymerization catalyst and wherein the polymerization reaction is conducted in the presence of an inert particulate material, the improvement comprising: commencing polymerization by polymerizing an ethylene propylene rubber having a crystallinity ranging from about 4 to 18 percent as measured by differential scanning calorimetry.

REFERENCES:
patent: 4343926 (1982-08-01), Caumartin et al.
patent: 5106927 (1992-04-01), Rifi et al.
patent: 5264506 (1993-11-01), Eisinger et al.
patent: 5376743 (1994-12-01), Baker et al.

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