Mitsui Chemicals, Inc.

Prime Polymer Co., Ltd.

Yasuo Satoh

Hideki Bando

Yoshiho Sonobe

Masao Suzuki

Daisuke Tanifuji

Makoto Mitani

Mamoru Takahashi

Yasushi Tohi

Takashi Yukita

Yasushi Nakayama

Yasuyuki Harada

Tsutomu Tasaki

Takahiro Akashi

Shinya Matsubara

Chiaki Tomata

Yusuke Sekioka

According to the invention, a single or plural kinds of bridged metallocene compounds having differing cyclopentadienyl-derived groups afford macromonomers that are a source of long-chain branches and simultaneously catalyze the repolymerization of the macromonomers into olefin polymers having a large number of long-chain branches, small neck-in in the T-die extrusion, small take-up surge and superior mechanical strength. The olefin polymerization catalysts and the polymerization processes can efficiently produce the olefin polymers.

Bridged metallocene compound, olefin polymerization catalyst containing the same, and ethylene polymer obtained with the catalyst

The present invention provides a film including, in at least a part thereof, a layer comprising an ethylene-based resin, which is a copolymer of ethylene and an &#x3b1;-olefin of 4 to 10 carbon atoms, and satisfies the following requirements (1) to (5) at the same time or an ethylene-based resin composition containing the resin;

Film or laminate comprising ethylene-based resin or ethylene-based resin composition

Ethylene-based resin, which exhibits a satisfactorily high melt tension and can provide a molded object excellent in mechanical strength, the ethylene-based resin characterized in simultaneously satisfying the requirements [1] to [5] described below:

Ethylene-based resin and molded object obtained therefrom

An ethylene-based polymer which is an ethylene/C4 to C10 &#x3b1;-olefin copolymer and satisfies the following requirements [k1] to [k3]: [k1] melt flow rate (MFR) under a loading of 2.16 kg at 190&#xb0; C. is in the range of 1.0 to 50 g/10 minutes; [k2] LNR defined as a scale of neck-in upon film molding is in the range of 0.6 to 1.4; and [k3] take-up speed at break [DS (m/min)] at 160&#xb0; C. and melt flow rate (MFR) satisfy the following relationship (Eq-1): 12&#xd7;MFR&#x2266;DS&#x2266;165&#xd7;MFR(Eq-1), and a thermoplastic resin composition containing the ethylene-based polymer, provide a molded product, preferably a film, excellent in moldability and mechanical strength. The ethylene-based polymer can be efficiently obtained by polymerization in the presence of an olefin polymerization catalyst formed from a solid carrier, (A) a solid transition metal catalyst component obtained by contacting (a) a compound of a transition metal of the group 4 in the periodic table, containing at least one ligand having a cyclopentadienyl skeleton, (b) an organoaluminum oxy compound, (c) a multifunctional organic halide, and if necessary (d) an organoaluminum compound, and if necessary (B) organoaluminum compound.

Ethylened polymer and molded object obtained therefrom

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Ichihara, Japan

Yasuo Satoh