Chisso Corporation

Japan Atomic Energy Research Institute

Shingo Kikukawa

Jun Saito

Akira Yamauchi

Hitoshi Sato

Tsutomu Ushioda

Mototake Tsutsui

Hideo Nobuhara

Fumio Yoshii

Masahiko Taniguchi

Kazuhiro Kimura

Keizo Makuuchi

Shunji Kawazoe

Yoshitaka Morimoto

Tadashi Tanaka

Yasuhiro Shiraishi

Akiko Kageyama

Hiroyuki Maehara

Hirohisa Ishii

Toshiki Yamamoto

Junichiro Yokota

Tooru Fukazawa

Masataka Sugimoto

Yasuhiko Nakagawa

Shouji Kawano

Yuichi Yamanaka

Hiroaki Ito

Yoichi Kugimiya

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

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

A high molecular weight polyethylene prepared by preliminary polymerization is added at the time of main polymerization of an olefin, for example, propylene, to prepare an olefin (co)polymer composition comprising the above high molecular weight polyethylene finely dispersed as fine particles in the polyolefin, such as polypropylene, and a cross-linked structure is formed in the olefin (co)polymer composition. This process can provide a modified olefin (co)polymer composition improved in the strength in a molten state in terms of melt tension or the like and in crystallization temperature and excellent in moldability such as high-speed producibility, and a molded modified olefin (co)polymer composition excellent in properties such as heat resistance and rigidity.

Modified olefin (co)polymer composition, process for preparing the same, and modified olefin (co)polymer composition molding

Polyolefin composition and method of making

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

A process for producing a modified polypropylene having a very high melt tension and superior stiffness and moldability, and a molded product obtained by using the modified polypropylene are provided.

Process for producing a modified polypropylene and a molded product

A linear, crystalline polypropylene having a branching coefficient of substantially 1, and a specified relation between melt-tensile strength and intrinsic viscosity, a specified relation between crystallization temperature and melting point, a boiling xylene-extraction residue % of 1 wt. % or less and if necessary, a specified ratio of weight average M.W./number average M.W.; a molded product from the above polypropylene; and a process for producing a polypropylene having the above polypropylene blended with di-2-ethylhexyl peroxydicarbonate, are provided, the above polypropylenes having a very high melt-tensile strength and crystallization temperature and also superior stiffness and moldability, to thereby broaden the restricted application fields of conventional polypropylene.

Polypropylene having a high melt-tensile strength, a process for

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Chiba, Japan

Shingo Kikukawa