Mitsui Chemicals, Inc.

Naomi Urakawa

Yasushi Tohi

Koji Endo

Koji Kawai

Toshiyuki Tsutsui

Yasuhiro Kitahara

Hiromu Kaneyoshi

Yuichi Yamamura

Akihiro Matsuda

Hideki Hirano

Makoto Nakano

Ryosuke Aburaki

Yuriko Iimura

Chiemi Okawa, Legal Representative

The propylene-based polymer composition includes a specific amount of a propylene-based polymer (A) having a syndiotactic pentad fraction (rrrr fraction) of 85% or more and containing 90 to 100 mol % of a structural unit derived from propylene; a specific amount of a propylene-based copolymer (B) containing 40 to 89 mol % of a structural unit derived from propylene and 11 to 60 mol % of a structural unit derived from an &#x3b1;-olefin and satisfying a specific equation of intrinsic viscosity [&#x3b7;] and MFR; and specific amount(s) of at least one polymer of an olefin-based thermoplastic elastomer (C), a styrene-based elastomer (D), a propylene/ethylene/&#x3b1;-olefin copolymer (E) and an isotactic propylene-based polymer (F), and optionally an ethylene/vinyl acetate copolymer (G) and/or an ethylene-based polymer (H).

Propylene-based polymer composition and uses thereof

A synthetic lubricating oil comprising an &#x3b1;-olefin (co)polymer defined by the features (i) to (v). Also, a lubricating oil composition including the above-mentioned synthetic lubricating oil and a low-viscosity base oil. The synthetic lubricating oil and the lubricating oil composition have high thermal oxidation stability and are excellent in viscosity index, low-temperature viscosity properties and shear stability.

Synthetic lubricating oil and lubricating oil composition

The bridged metallocene compound or the olefin polymerization catalyst which comprises the compound, enables high polymerization activity in polymerizing one or more monomers selected from ethylene and &#x3b1;-olefins. The bridged metallocene compound contains specific substituted cyclopentadienyl and fluorenyl groups which are linked via carbon or silicon atoms. In the method for the preparation of polyolefins, one or more monomers, preferably ethylene as an essential monomer, selected from ethylene and &#x3b1;-olefins are copolymerized in the presence of the olefin polymerization catalyst comprising the bridged metallocene compound, so that an ethylene based polymer with an ethylene content of more than 50 mol % is obtained.

Crosslinked metallocene compound for olefin polymerization and method of polymerizing olefin with the same

The present invention provides a process for preparing a low molecular weight olefin (co)polymer having a narrow molecular weight distribution with high productivity, by polymerizing or copolymerizing an olefin in the presence of an olefin polymerization catalyst comprising (A) a specific Group 4 transition metal compound, and (B) at least one compound selected from the group consisting of (B-1) an organometallic compound, (B-2) an organoaluminum compound, (B-3) an organoaluminum oxy-compound, and (B-4) a compound which reacts with the Group 4 transition metal compound (A) to form an ion pair; and compounds useful in that process.

Process for preparing low molecular weight olefin (CO)polymer and polymerization catalyst used therefor

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Sodegaura, Japan

Naomi Urakawa