Sunallomer Ltd.

Basell Poliolefine Italia S.r.l.

Resonac Corporation

Hiroshima University

Akihiro Otsubo

Claudio Cavalieri

Takeshi Nakajima

Koji Yamada

Hideharu Kimura

Masamichi Hikosaka

Junichiro Washiyama

Kiyoka Okada

Kaori Watanabe

Akihiro Kamimura

Roberto Pantaleoni

Hiroshi Fujiishi

Shintaro Takemiya

Provided is a propylene homopolymer or a copolymer of propylene and a 30 wt % or less &#x3b1;-olefin having 2 or 4 to 8 carbon atoms, having a intrinsic viscosity of more than 20 dl/g, as measured in a tetralin solvent at 135&#xb0; C.

Ultrahigh molecular weight propylene (co)polymer

The purpose of the present invention is to produce an alpha-olefin polymer having excellent production stability utilizing a long-lasting high catalytic activity. Provided is a method for producing an alpha-olefin polymer using a catalyst comprising:

Method for polymerizing alpha-olefin

A process and apparatus for manufacturing a crystalline resin film or sheet. This manufacturing apparatus includes: an extruder that melts crystalline resin while supplying it; a gear pump that is provided on the downstream side of the extruder; a die which is provided on the downstream side of the gear pump, and which has a slit-shaped aperture; a cooling apparatus which cools film-shaped or sheet-shaped crystalline resin (A) discharged in a melted state from the die to a temperature which is not less than the crystallization temperature but not more than the melting point; and a pair of pinch rolls that press-roll between them the film-shaped or sheet-shaped crystalline resin (B) which has passed through the cooling apparatus (), wherein the pair of guide rolls are positioned such that the thickness of the film-shaped or sheet-shaped crystalline resin (B) which has passed through the cooling apparatus is between 1.3 and 8.0 times the thickness of the film or sheet (C, D) after it has been press-rolled.

Process and apparatus for producing crystalline resin film or sheet

A polymer sheet according to at least one embodiment of the present invention is a polymer sheet whose main component is oriented nanocrystals of a polymer, and which satisfies the following conditions (I), (II), and (III): (I) having a crystallinity of not less than 70%; (II) having a tensile strength at break of not less than 100 MPa and a tensile modulus of not less than 3 GPa; and (III) having an average thickness of not less than 0.15 mm. According to at least one embodiment of the present invention, it is possible to provide a polymer sheet excelling in properties such as mechanical strength, heat tolerance, and transparency, particularly a polymer sheet having excellent properties such as mechanical strength, heat tolerance, and transparency in general-purpose plastics such as polypropylene.

Polymer sheet and method for producing same

Random propylene/ethylene copolymers are provided characterized by The said copolymers show an excellent balance of impact and optical properties which is retained even after visbreaking.

Propylene-ethylene copolymers and process for their preparation

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Kawasaki, Japan

Akihiro Otsubo