Ziegler-Natta produced polyethylene and methods thereof
AssigneeBraskem S.A.
InventorsMárcia Silva Lacerda Miranda, Olavo Martins Junior, Yue Yu, Christophe Boisson, Timothy Frederick Llewellyn McKenna
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Abstract
A process of producing a composition comprising a copolymer of ethylene and one or more C4-C8 α-olefins, may include copolymerizing the ethylene and the one or more C4-C8 α-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.
Claims35
A process of producing a composition comprising a copolymer of ethylene and one or more C4-C8 α-olefins, the process comprising:
- copolymerizing the ethylene and the one or more C4-C8 α-olefins in the presence of a procatalyst and an alkylaluminum cocatalyst,
- wherein the procatalyst is a Ti-containing Ziegler Natta procatalyst,
- wherein polymerization comprises 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, and
- wherein the composition satisfies one or more of the following as determined by cross fractionation chromatography (CFC):
- a weight average molecular weight (Mw) of a room temperature soluble fraction, eluted at 35° C. to 40° C., is at least 70 kDa, and a ratio S×1/Stotal is 0.35 or less, where S×1 is a sum of total peak areas of components that are eluted at 35° C. to 40° C., and Stotal is a sum of total peak areas of components that are eluted at 0 to 120° C.;
- a weight average molecular weight (Mw) of a fraction eluted at 43° C. to 79° C., ranges from 140 kDa to 1750 kDa, and a ratio S×2/Stotal is 0.43 or more, where S×2 is a sum of total peak areas of components that are eluted at 43° C. to 79° C.;
- and
- a weight average molecular weight (Mw) of a fraction eluted at 82° C. to 120° C. ranges from 1800 kDa to 3600 kDa and a ratio S×3/Stotal ranges from 0.20 to 0.28, where S×3 is a sum of total peak areas of components that are eluted at 82° C. to 120° C.
A process of producing a composition comprising a copolymer of ethylene and one or more C4-C8 α-olefins, the process comprising:
- copolymerizing the ethylene and the one or more C4-C8 α-olefins in the presence of a procatalyst and an alkylaluminum cocatalyst,
- wherein the procatalyst is a Ti-containing Ziegler Natta procatalyst,
- wherein the polymerization comprises 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, and
- wherein the composition has, according to gel permeation chromatography coupled with Fourier transform infrared spectroscopy (GPC-FTIR), an angular coefficient b that ranges from −5 to 5 over a molecular weight (M) range of log(M) of 3.5 to 5.5,
- where the angular coefficient b is provided by a linear regression of a curve obtained by plotting short chain branches per 1000 total carbon atoms (SCB/1000TC) vs. log(M) according to equation SCB/1000TC=blog(M)+a, where a is a linear coefficient, and
- wherein the composition has a molecular weight distribution ranging from about 3 to 10.
A composition, comprising a copolymer of ethylene and one or more C4-C8 α-olefins,
- wherein the composition satisfies one or more of the following as determined by cross fractionation chromatography (CFC):
- a weight average molecular weight (Mw) of a room temperature soluble fraction, eluted at 35° C. to 40° C., is at least 70 kDa, and a ratio S×1/Stotal is 0.35 or less, where S×1 is a sum of total peak areas of components that are eluted at 35° C. to 40° C., and Stotal is a sum of total peak areas of components that are eluted at 0 to 120° C.;
- a weight average molecular weight (Mw) of a fraction eluted at 43° C. to 79° C., ranges from 140 kDa to 1750 kDa, and a ratio S×2/Stotal is 0.43 or more, where S×2 is a sum of total peak areas of components that are eluted at 43° C. to 79° C.;
- and
- a weight average molecular weight (Mw) of a fraction eluted at 82° C. to 120° C. ranges from 1800 kDa to 3600 kDa and a ratio S×3/Stotal ranges from 0.20 to 0.28, where S×3 is a sum of total peak areas of components that are eluted at 82° C. to 120° C.
Dependencies are inferred from the claim text.