Braskem S.a.

Márcia Silva Lacerda Miranda

Olavo Martins Junior

Rodrigo Brambilla

Etienne Marcos De Almeida Rocha

Fabio Andre Kunrath

Timothy Frederick Llewellyn McKenna

Christophe Boisson

Ana Cristina Fontes Moreira

Yue Yu

Maria Angélica Cardoso Gollmann

A process for preliminary polymerization may include washing a catalyst mud comprising a supported metallocene catalyst with at least one saturated hydrocarbon at a temperature from 0° C. to 40° C., a pressure from 20 to 40 kgf/cm, and a residence time of at least 30 minutes; continuously feeding the washed catalytic mud to a continuous pre-polymerization reactor; and pre-polymerizing, in the continuous pre-polymerization reactor, ethylene and at least one Cto Cα-olefin as comonomer, with the washed catalytic mud, to produce a pre-polymer; wherein an average residence time in the continuous pre-polymerization reactor is more than 90 minutes and less than 240 minutes, a reactor temperature is from 10° C. to 50° C., and a reactor pressure from 20 to 40 kgf/cm.

Continuous process for metallocene preliminary polymerization for gas-phase polymerization process

A process of producing a composition comprising a copolymer of ethylene and one or more C4-C8 &#x3b1;-olefins, may include copolymerizing the ethylene and the one or more C4-C8 &#x3b1;-olefins in the presence of a procatalyst and an alkylaluminum cocatalyst. The procatalyst may be a Ti-containing Ziegler Natta procatalyst and the polymerization may include the procatalyst and the alkylaluminum cocatalyst in amounts such that a molar ratio of Al:Ti ranges from about 0.5 to about 50.0.

Ziegler-Natta produced polyethylene and methods thereof

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São Paulo, Brazil

Márcia Silva Lacerda Miranda