Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymerizing in two or more physically distinct zones
Patent
1994-05-23
1995-12-26
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymerizing in two or more physically distinct zones
526106, C08F 218, C08F 424
Patent
active
054788986
ABSTRACT:
A process for the polymerization of at least one olefin is a suspension process employing a hydrocarbon diluent such that at least 70% of the polymer formed is insoluble therein, and employs at least two polymerization reactors. The process includes introducing a first portion of the at least one olefin and a catalyst into a first reactor. The catalyst is composed of bis(cyclopentadienyl)chromium, which may be substituted, supported on an inorganic oxide support and is supplied solely into the first reactor. The at least one olefin is polymerized in the first reactor to provide a first composition composed of a polymer and the catalyst. The first composition is then drawn off from the first reactor and the first composition and another portion of the at least one olefin are introduced into a second reactor and the another portion of the at least one olefin is polymerized in the second reactor in the presence of the first composition. Further, hydrogen is introduced into at least one of the reactors at a partial pressure ranging from 0.01 to 0.50 MPa, the ratio of the hydrogen to olefin partial pressure in this reactor ranging from 0.01 to 3. Additionally, the olefin partial pressure in the at least two reactors ranges from atmospheric pressure to 5 MPa, and the polymerization in the at least two reactors is carried out at a temperature ranging from 50.degree. to 100.degree. C.
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Schofer Joseph L.
Solvay ( Societe Anonyme)
Weber Tom
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