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AssigneeMitsui Chemicals, Inc.
InventorsMakoto Mitani, Yasunori Yoshida, Junichi Mohri, Kazutaka Tsuru, Seiichi Ishii, Shinichi Kojoh, Tomoaki Matsugi, Junji Saito, Naoto Matsukawa, Shigekazu Matsui, Takashi Nakano, Hidetsugu Tanaka, Norio Kashiwa, Terunori Fujita
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The present invention provides an olefin polymer having a narrow molecular weight distribution and a specific molecular weight, an olefin polymer having a functional group introduced at the terminal, a tapered polymer containing a segment wherein monomer composition continuously changes in the polymer chain, an olefin polymer having different segments which are bonded to each other, and a process for preparing these polymers. The olefin polymers of the invention are polymers of olefins of 2 to 20 carbon atoms and have a number-average molecular weight of not less than 500 and Mw/Mn of not more than 1.5. In the process for preparing an olefin polymer, an olefin of 2 to 20 carbon atoms is polymerized in the presence of an olefin polymerization catalyst comprising a transition metal compound represented by, for example, the following formula (I): LmMXn (I) wherein M is a transition metal atom of Group 3 to Group 11 of the periodic table, m is 1 to 5, n is a number satisfying a valence of M, L is a ligand coordinated to the central metal M and is a ligand containing a heteroatom having no direct bond to the central metal, and X is a halogen atom, a hydrocarbon group or the like.
An olefin polymer which is a polymer of at least one olefin selected from olefins of 2 to 20 carbon atoms and has a number-average molecular weight of not less than 500 and Mw/Mn (Mw:
An olefin polymer which is an olefin copolymer of at least two olefins selected from olefins of 2 to 20 carbon atoms, has a number-average molecular weight of not less than 500 and is a tapered polymer containing a segment wherein composition of two or more monomers continuously changes in the polymer chain.
An olefin polymer which is an olefin copolymer comprising a monomer unit Ml derived from an olefin of 2 to 20 carbon atoms and at least one monomer unit M2 that is different from the monomer unit M1, and has the following properties:
An olefin polymer which as a block copolymer comprising
A process for preparing an olefin polymer, comprising polymerizing an olefin in the presence of a polymerization catalyst which promotes living polymerization of an olefin and further conducting olefin polymerization by the use of a catalyst obtained by cleaving a bond produced in the system between the catalyst and the resulting polymer chain by means of chain transfer reaction.
Dependencies are inferred from the claim text.