Chisso Corporation

Hitoshi Kuramochi

Takanori Nakashima

Shinichi Akitaya

Yoshitaka Sumi

Jun Saito

Toshihiro Uwai

Tsutomu Ushioda

Masahiko Taniguchi

Yoshitaka Morimoto

Mototake Tsutsui

Osamu Kojima

Youichi Kugimiya

Hiroyuki Fujita

Yoshitoyo Yasuda

Yoshiyuki Ohgi

Taketo Hirose

Minoru Adachi

A molded polypropylene having an excellent balance among various material properties including impact resistance, transparency, gloss, molding shrinkage, and whitening resistance. The molding is constituted of a material comprising a resin composition comprising 10 to 60% by weight crystalline polypropylene (matrix) and 90 to 40% by weight propylene/&agr;-olefin copolymer (domains). The copolymer has been dispersed in the crystalline polypropylene to form domains elongated in the direction (MD) in which the resin composition flows during molding. Each domain is connected to one or more other domains at least at one site (connecting chain).

Molded polypropylene

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

Polypropylene composition

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Minamata, Japan

Hitoshi Kuramochi