Chisso Corporation

Other

Mototake Tsutsui

Tsutomu Ushioda

Jun Saito

Hiroyuki Fujita

Yoshitoyo Yasuda

Yoshiyuki Ohgi

Minoru Adachi

Yoshitaka Morimoto

Yasuhiro Shiraishi

Youichi Kugimiya

Shingo Kikukawa

Taketo Hirose

Akira Yamauchi

Toshihiro Uwai

Masahiko Taniguchi

Akiko Kageyama

Kouichi Hatada

Shinji Nakata

Hiroyuki Maehara

Yoshiyuki Oogi

Hitoshi Kuramochi

A polypropylene base resin composition for foam-molding which use's a propylene&bull;&agr;,&ohgr;-diene base copolymer containing a small amount of &agr;,&ohgr;-diene and obtained by copolymerizing propylene with a specific amount of &agr;,&ohgr;-diene in the presence of a catalyst system for polymerizing olefin comprising a metallocene supported catalyst or a pre-activated metallocene supported catalyst and an organic aluminum compound and which provides a foamed article having uniform and fine foamed cells (bubbles) and a high foaming magnification, a foamable polypropylene base resin composition comprising the propylene&bull;&agr;,&ohgr;-diene base copolymer and a specific amount of a foaming agent, a foamed article obtained by foam-molding the above composition, a production process for the above foamed article and a foam-molded product prepared by heat-molding the above foamed article.

Polypropylene base resin composition for foam-molding, foamed article using the same composition, production process for the same foamed article and foam-molded product using the foamed-article

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

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

Polypropylene composition

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

Preactivated catalyst for olefin (CO)polymer, catalyst for olefin

Growing community of inventors

Ichihara, Japan

Mototake Tsutsui