Chisso Corporation

Other

Japan Atomic Energy Research Institute

Jun Saito

Tsutomu Ushioda

Mototake Tsutsui

Shingo Kikukawa

Hiroyuki Fujita

Yoshitoyo Yasuda

Akira Yamauchi

Toshihiro Uwai

Yoshitaka Morimoto

Masato Nakano

Akiko Kageyama

Hiroshi Yamazaki

Yoshiyuki Ohgi

Seiki Mitani

Yoshiyuki Oogi

Minoru Adachi

Hitoshi Sato

Yasuhiro Shiraishi

Kouichi Hatada

Hideo Nobuhara

Naoshi Kawamoto

Taketo Hirose

Masahiko Taniguchi

Masami Tachibana

Masato Harada

Youichi Kugimiya

Hiroyuki Maehara

Akihiko Sanpei

Tsuyoshi Yahata

Mina Koyama

Keisuke Kimura

Masami Kimura

Takanori Nakashima

Fumio Yoshii

Kazuhiro Kimura

Keizo Makuuchi

Shunji Kawazoe

Tadashi Tanaka

Chikashi Okayama

Michitaka Sasaki

Shinji Nakata

Hirohisa Ishii

Junichiro Yokota

Toshimori Nakai

Toshiki Yamamoto

Tooru Fukazawa

Takanobu Kawamura

Hitoshi Kuramochi

Masataka Sugimoto

Yuuichi Yamanaka

Yasuhiko Nakagawa

Shouji Kawano

Katsuhiko Ohno

Yoichi Kugimiya

Yuichi Yamanaka

Hiroaki Ito

Sinzi Chiku

Kazuo Ito

Yoshiro Umemoto

A polypropylene composition comprising 0.001 to 10 parts by weight of a polyethylene having an intrinsic viscosity &lsqb;&eegr;E&rsqb; of 0.01 to less than 15 dl/g s measured in tetralin at 135&deg; C. and 100 parts by weight of a polyolefin comprising at least polypropylene, wherein the polyethylene is finely dispersed as particles with a number average particle diameter of, e.g., 1 to 5000 nm in the polyolefin comprising at least polypropylene. By virtue of the above constitution, the polypropylene composition has excellent transparency and rigidity, is free from the creation of a sweeper roll flow mark in the preparation of a film and substantially free from a neck-in phenomenon of a film, and has high productivity.

Polypropylene composition, process for preparing the same, and polymerization catalyst therefor

A polydisperse propylene polymer characterized by being produced by polymerizing a propylene monomer or a mixed monomer of propylene and other olefin(s) by a multistage polymerization wherein the polymerization conditions are stepwise changed in the presence of a supported metallocene catalyst having a transition metal compound and an aluminoxane or a reaction product thereof supported on a finely particulate support, and an organoaluminum compound as a scavenger, and by having a ratio of a weight-average molecular weight to a number-average molecular weight (Mw/Mn) of 4.0 or higher, a melting point (Tm) of 165&deg; C. or lower and a difference between the melting point (Tm) and a heat distortion temperature (HDT) of 30&deg; C. or less.

Polydisperse propylene polymer and process for producing the same

A plastic molded product of olefin (co)polymer composition comprises 0.01-5.0 weight parts high molecular weight polyethylene with an intrinsic viscosity &eegr; in the range of 15-100 dl/g measured in 135&deg; C. tetralin and preferably 100 weight parts polypropylene. The high molecular weight polyethylene has an average particle size in the range of 1-5000 nm and is finely dispersed as fine granules in the polypropylene, so that high melt strength and high crystallization temperature are attained, enabling various molding methods to be performed with high speed productivity. Using the polymer composition, plastics such as a resin foam, a film, a sheet, a layered plastic article with a coated substrate surface, a hollow plastic article, an injection molded plastic article, a fiber, a nonwoven web or a continuous tube-shaped plastic are provided. The olefin (co)polymer composition is obtained by preparing high molecular weight polyethylene granules using e.g. a titanium transition metal compound catalyst, and adding these, e.g. as a polymerization catalyst of propylene, singly or together with a polyolefin preparing catalyst.

Molded resin articles

&mgr;-oxo-bis-metallocene complex compounds and catalysts using same for the polymerization of olefins as well as polymerization process

Supported metallocene catalyst, process for preparing the same, and process for producing olefin polymers

Disclosed is a process for producing olefin polymers or copolymers which can freely regulates the molecular weight of the polymers or copolymers as well as novel olefin polymers or copolymers excellent in rigidity, heat-resisting property and transparency, moldings and compositions thereof which find a wide variety of applications in versatile industrial parts including containers, films, sheets, filaments or fibers, featured by (1) a process for producing olefin polymers or copolymers by the aid of a catalyst comprised predominantly of the compounds: (A) a transition metal compound of the formula: Q(C H R )(C H R )MXY, (B) an aluminoxane, (C) a fine particulate carrier, and (D) an organoaluminum compound; (2) olefin polymers or copolymers characterized by (a) a specific ratio of isotactic pentad, (b) 2,1- and 1.3-propylene units contents in the polymer chain, (c) a specific Mw, (d) a specific Mw/Mn, and (e) in case of elevating temperature of o-dichlorobenzene continuously or stepwise up to given temperatures to measure the amount of eluated polyolefin at each temperature, the position of a main elution peak and the amount of components existing in the range of &plusmn;10&deg; C. of the main elution peak; (3) injection moldings, films, filaments or fibers, and non-woven fabric of the polypropylene obtained; and (4) a composition comprising the polypropylene obtained and an &agr;-nucleating agent or a composition comprising the polypropylene and a radical generator and having been produced by subjecting to the mixture to melt-kneading.

Process for the preparation of olefin (co) polymers, olefin copolymers, and application thereof

Propylene/ethylene/&agr;-olefin terpolymers and processes for the production thereof

Propylene/ethylene random copolymer, molding material, and molded article

To provide a catalyst for olefin (co)polymerization which shows a high polymerization activity and which can produce olefin (co)polymers having a high molecular weight and a narrow molecular weight distribution; the catalyst for olefin (co)polymerization is rendered a carried type catalyst comprising a transition metal compound represented by general formula (I) or (II) and aluminoxane carried on a fine particulate carrier.

Catalyst for olefin (CO) polymerization and process for the production of olefin (CO) polymers

A process for producing a propylene//propylene/olefin block copolymer, characterized by using as a supported metallocene catalyst a solid product obtained by conducting, in this order, the step (a) of reacting an organic transition metal compound having two crosslinked conjugated &pgr;-electron ligands with an aluminoxane in an inert solvent, the step (b) of contacting the reaction product obtained in the step (a) with a finely particulate inorganic support in the presence of an inert solvent at 85 to 150&deg; C., and the step (c) of washing the slurry containing a solid product yielded in the step (b) with an aliphatic hydrocarbon at least twice at &minus;50 to 50&deg; C.; and a propylene//propylene/olefin block copolymer produced by said process.

Propylene/propylene/olefin block copolymer and process for producing the same

A metallocene compound is provided wherein to a transition metal compound is bonded a multidentate compound wherein a substituted cycloalkadienyl ring CA,having therein a heteroaromatic group Ra containing an oxygen, sulfur or nitrogen atom on a cycloalkadienyl ring, preferably the five-membered ring thereof, and an unsubstituted or substituted cycloalkadienyl group CA,or &mdash;(R,)N&mdash;, &mdash;O&mdash;, &mdash;S&mdash; or &mdash;(R,)P&mdash;, preferably CA,, more preferably a substituted cycloalkadienyl group identical with CA,are bonded through a divalent linking group. The metallocene compound is suitable as a principal ingredient of a catalyst for the polymerization of olefins, particularly achieving a very high effect in making the molecular weight of a polypropylene higher.

Metallocene compounds, processes for the preparation thereof, catalyst components for olefin polymerization, and processes for the production of olefin polymers

Polypropylene composition

Disclosed is a catalyst for olefin (co-)polymerization comprising a transition metal compound catalytic component which contains at least a titanium compound and an &agr;-olefin (co-)polymer (A) supported by the catalyst, wherein said &agr;-olefin (co-)polymer (A) has an intrinsic viscosity (&eegr;) of 15 dl/g to 100 dl/g measured in tetrahydronaphthalene at 135&deg; C., and the content of said olefin (co-)polymer (a) is 0.01 to 5000 g for 1 g of the transition compound catalytic component.

Catalyst for olefin (co-)polymerization and method for producing the same

The present invention provides a polypropylene composition having a high melt tension and an excellent formability by blending polypropylene (I) produced with a metallocene catalyst type and an olefin (co)polymer (II) comprising 0.01 to 5 parts by weight of the following component (II-1) and 100 parts by weight of the following component (II-2); (II-1): an ethylene homopolymer or an ethylene-olefin copolymer comprising at least 50 wt % ethylene polymerization units, which is a high molecular weight polyethylene having an intrinsic viscosity &lsqb;&eegr;,&rsqb; measured in tetralin at 135&deg; C. of 15 to 100 dl/g; and (II-2): polypropylene.

Propylene (co)polymer composition using metallocene catalyst

Propylene copolymer and process for the production thereof

Growing community of inventors

Kimitsu, Japan

Jun Saito