Mitsubishi Chemical Industries Limited

Mitsubishi Kasei Corporation

Nobuo Enokido

Yoshinori Suga

Toru Tanaka

Eiji Tanaka

Yasuo Maruyama

Atsushi Murakami

Kazuo Yamaguchi

Natsuki Kanoh

Yukio Yamaguchi

Yumito Uehara

Motonori Ueda

Masatoshi Suzuki

Hidehito Kato

Shigeaki Okano

Seiji Yoshida

Nobuyuki Shimizu

Kazutoshi Iwatani

Katsuji Shibata

Kiyotoshi Fujioka

A process for producing an olefin polymer comprising polymerizing an olefin or olefins in the presence of a catalyst system, in which the catalyst system comprises of (A) a hydrocarbon-insoluble solid catalyst component obtained by treating a uniform hydrocarbon solution containing (a) an magnesium compound, e.g., a dialkoxymagnesium, (b) an titanium compound, e.g., a titanium tetraalkoxide, and (c) a polyalkyltitanate represented by formula (I): ##STR1## wherein R.sup.3 's, which may be the same or different, each represent an alkyl group, an aryl group, or a cycloalkyl group; and p represents an integer of from 2 to 20, with a halogenating agent and (B) an organoaluminum compound. The resulting olefin polymer has broad molecular weight distribution, high melt tension, and high melt elasticity and is freed of fish eye by kneading under ordinary conditions.

Process for producing olefin polymer

An ethylene homopolymer or copolymer comprising ethylene and not more than 10% by weight of an .alpha.-olefin having from 3 to 20 carbon atoms and a fuel tank obtained therefrom are disclosed, said ethylene homopolymer or copolymer having (1) an intrinsic viscosity [.eta.] of from 2 to 6 dl/g, (2) a density of from 0.945 to 0.970 g/cm.sup.3, (3) an R value of from 2.5 to 4, said R value being defined as a .sigma..sub.2 /.rho..sub.1 ratio, wherein .sigma..sub.1 and .sigma..sub.2 mean stress in elongation with a strain at 2 sec and 4 sec, respectively, under a flow at an elongational strain rate .epsilon. of 0.5 sec.sup.-1, and (4) a relationship between high-velocity impact strength (HRI-IZOD) measured at -30.degree. C. and a melt index under a load of 21.6 kg (HLMI) satisfying formula:

Ethylene polymer and fuel tank comprising the same

A modified 3-methylbutene-1 polymer as prepared by grafting a monomer containing an unsaturated group onto a 3-methylbutene-1 homo- or copolymer, a 3-methylbutene-1 polymer composition comprising a 3-methylbutene-1 polymer and a fibrous material, and a molded article comprising a mold of a 3-methylbutene-1 polymer and a thin metallic layer provided on the mold.

3-methylbutene-1 polymer, composition containing said polymer, and

A 3-methylbutene-1 polymer composition comprising:

3-Methylbutene-1 polymer composition, process for its preparation and

3-Methylbutene-1 polymer composition and process for its production

In a process for polymerizing an olefin in the presence of a catalyst system combining an organoaluminum compound with a hydrocarbon insoluble solid catalytic component prepared by treating a hydrocarbon solution containing a magnesium compound, and a titanium compound with an aluminum halide having the formula

Process for polymerizing olefin

A process for the preparation of polyolefins, polymerizing olefins with use of a solid catalyst separated from a reaction mixture which is obtained by reducing a halogen-containing compound of vanadium with an organic aluminum compound in the presence of an ether and an organic aluminum compound.

Process for the preparation of polyolefins using a reduced vanadium

Polyolefin is prepared by polymerizing an olefin by using a catalyst system combining an auxiliary catalytic component of an organoaluminum compound and a solid catalytic component obtained by reacting a mixture of a vanadium trichloride ether complex and a titanium trichloride ether complex with an aluminum halide and/or a boron halide.

Process for preparing polyolefin

A solid catalytic complex for the polymerization of an olefin has the formula:

Growing community of inventors

Kanagawa, Japan

Nobuo Enokido