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

• Main Authors: Ushioda, Tsutomu, Saito, Jun, Tsutsui, Mototake, Yasuda, Yoshitoyo, Fujita, Hiroyuki, Uwai, Toshihiro, Ohgi, Yoshiyuki, Adachi, Minoru, Morimoto, Yoshitaka, Hirose, Taketo, Kugimiya, Youichi, Taniguchi, Masahiko, Kuramochi, Hitoshi
• Format: Patent
• Language: English
• Published: 25.06.2002

The present invention relates to a process for producing olefin polymers or copolymers capable of being controlled in molecular weight as well as novel olefin polymers or copolymers and applications thereof. More particularly, the present invention relates to a process for producing olefin polymers or copolymers of a high molecular weight wherein a polymerization time or an average retention time in a polymerization reactor is adjusted by the aid of a specific metallocene catalyst thereby enabling control of the molecular weight at the time of producing the olefin polymers or copolymers and adjustment of the molecular weight to a higher molecular weight range as well as novel olefin polymers or copolymers and injection moldings excellent in rigidity and heat-resistance, especially molded from polypropylene; films excellent in transparency in addition to the above characteristics; a composition comprising the aforesaid polypropylene and an -form nucleating agent; a modified composition which is comprised predominantly of the aforesaid polypropylene and a radical generator and has been subjected to melt-kneading treatment; and filaments or fibers or non-woven fabrics of the aforesaid propylene polymers or copolymers. 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(CHR)(CHR)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 ±10° 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 -nucleating agent or a composition comprising the polypropylene and a radical generator and having been produced by subjecting to the mixture to melt-kneading.