Chisso Corporation

Minoru Adachi

Jun Saito

Tsutomu Ushioda

Mototake Tsutsui

Hiroyuki Fujita

Yoshitoyo Yasuda

Yoshitaka Morimoto

Youichi Kugimiya

Yoshiyuki Ohgi

Taketo Hirose

Toshihiro Uwai

Masahiko Taniguchi

Yasuhiro Shiraishi

Yoshiyuki Oogi

Hitoshi Kuramochi

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 random copolymer, molding material, and molded article

Polypropylene composition

Growing community of inventors

Ichihara, Japan

Minoru Adachi