Chisso Corporation

Other

Japan Polypropylene Corporation

Takanori Nakashima

Chikashi Okayama

Shinichi Akitaya

Yoshitaka Sumi

Shinji Nakata

Yasuhiro Mochizuki

Yuya Ishimoto

Yoshitaka Morimoto

Yoshitaka Kobayashi

Yasuhiro Shiraishi

Noriaki Saito

Toshiki Yamamoto

Masami Kimura

Iku Kouzai

Yusuke Yamada

Youichi Kugimiya

Keiji Fukuda

Kouji Nakayama

Hitoshi Kuramochi

Akinori Maekawa

Yuusuke Yamada

Youichi Maeda

Jun Saito

Akira Yamauchi

Takao Tayano

Kazuhiro Kimura

Michitaka Sasaki

Shigeo Mizukami

Osamu Kojima

Hiroyuki Maehara

Takayuki Hattori

Junichiro Yokota

Hirohisa Ishii

Kiyoshi Yukawa

Taketo Hirose

Yuji Ando

Kunio Gouda

Shouji Kawano

Yasuhiko Nakagawa

Masataka Sugimoto

Sinichi Akitaya

Katsuhiko Oono

Kenji Mitsutani

Nobuhiro Iwai

Tomoyuki Yoshida

Hajime Aoyama

Kentaro Niijima

Mayumi Wakata

A method for producing a propylene-based polymer, including polymerizing propylene or propylene and an &#x3b1;-olefin except propylene in the presence of a catalyst with a horizontal polymerization reactor equipped with stirring vanes rotating around a horizontal axis therein by a continuous vapor-phase polymerization, which removes heat of polymerization by heat of vaporization of a liquefied propylene, wherein the reactor can set a plurality of area sections different in temperature in a horizontal direction inside the reactor, and satisfies at least one of i) a temperature difference, &#x394;T=T&#x3c9;&#x2212;T&#x3b1;, between an area section including an upstream end of the reactor (T&#x3b1;) and a downstream end (T&#x3c9;) thereof is 0.1 to 20&#xb0; C. and ii) a temperature difference, &#x394;T=Tx&#x2212;Tz, between an area section including a catalyst feed part (Tx) and dew point (Tz) of a mix gas in the reactor is 0 to 5&#xb0; C.

Method for producing propylene-based polymer

A propylene polymerization reaction apparatus and a production method of a propylene-based polymer are capable of producing a continuous multi-stage polymer in low cost, high productivity and stably, and significantly reducing generation amount of an off-specification product accompanying change of polymerization condition, in multi-stage continuous vapor phase polymerization method of a propylene-based polymer using a catalyst for olefin polymerization. A reaction apparatus for producing a propylene-based polymer by a multi-stage continuous vapor phase polymerization method is used. One or more reactor of a horizontal-type reactor having inside a stirring machine which rotates around a horizontal axis, and a continuous stirred tank reactor to be connected to the horizontal-type reactor are provided, and a production method of a propylene-based polymer using the same.

Reactor for propylene polymerization and process for producing propylene polymer

Disclosed is a production method of polypropylene having high MFR value and excellent product qualities with high productivity. The method enables to produce a propylene polymer by a gas phase process where the reaction heat is removed mainly by the heat of vaporization of liquefied propylene. The method is characterized by using a solid catalyst component (A) which is prepared by contacting components (A1), (A2) and (A3) shown below. Further disclosed are: a propylene polymer produced by the method; a propylene polymer composition; and a molded body of the composition. Component (A1): a solid component containing titanium, magnesium and a halogen as essential components. Component (A2): a vinyl silane compound. Component (A3): an organosilicon compound having an alkoxy group (A3a) and/or a compound having at least two ether bonds (A3b).

Propylene-based polymer and production method therefor, propylene-based polymer composition and molded body made thereof

Polypropylene resin composition and gas permeable film using the same

A propylene resin composition is constructed so as to contain (A) a propylene-&agr;-olefin random copolymer with the content of a propylene unit of 99.1 to 99.9% by weight, and (B) a propylene-&agr;-olefin random copolymer with the content of a propylene unit of 70 to 90% by weight, in the specified proportion, and to have the specified loss tangent (tan &dgr;) and storage elastic modulus (E&prime;), in the temperature dependence of dynamic viscoelasticity. Thereby, the propylene resin composition is provided, suitable as a raw material for shaped article having a well-balanced combination of transparency, stress-whitening resistance; impact resistance at low temperatures, and further heat resistance.

Propylene resin composition

To provide a uniaxially oriented polypropylene-based film excellent in tensile elongation along the TD direction and transparence, and generating less fibers when it is torn, a film-forming material which comprises a polypropylene-based resin material consisting of 40 to 95% by weight of crystalline polypropylene, and 60 to 5% by weight of propylene-&agr;-olefin copolymer dispersed as particles in the crystalline polypropylene is uniaxially oriented to afford a uniaxially oriented polypropylene-based film, wherein the particles of the copolymer have an aspect ratio (L/D) of mean dispersed particle length (L) to mean dispersed particle diameter along the film thickness direction (D) of 100 or more in a cross section of the film along the MD direction, and the mean dispersed particle diameter of 0.10 &mgr;m or less.

Uniaxially oriented polypropylene-based film

This invention relates to a propylene series resin sheet that has a large tan &dgr; and high frequency welding characteristics, excellent transparency, low-temperature impact resistance, and surface durability. The propylene series resin sheet is characterized by a mixture of a polypropylene series composition with a weight percentage of 50-99% and an ethylene series copolymer with a weight percentage of 1-50%.

Polypropylene series resin sheet

The present invention relates to a film using a polypropylene composition comprising crystalline polypropylene and a copolymer of propylene with &agr;-olefin in which a limiting viscosity of the said copolymer &lsqb;&eegr;&rsqb; is not more than 6.5 dl/g; the ratio of the limiting viscosity of the said polymer &lsqb;&eegr;&rsqb; to the limiting viscosity of the said crystalline polypropylene &lsqb;&eegr;&rsqb; is from 0.6 to 1.2; and the product i.e. (&lsqb;&eegr;&rsqb; /&lsqb;&eegr;&rsqb; )&times;(W /W ), of the ratio of the limiting viscosity of the copolymer to the crystalline polypropylene with the ratio by weight of them is within a range of from 0.2 to 4.5 and also relates to a multi-layered film having at least one layer of the said film.

Polypropylene film and multilayered polypropylene film

Process for producing polypropylene or propylene random copolymer

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

A breathing film comprising at least one layer obtained by processing a propylene resin composition including crystalline propylene polymer(A) and propylene/&agr;-olefin random copolymer(B) is provided, said film having anti-bacterial agent, and the ratio &lsqb;&eegr;&rsqb; /&lsqb;&eegr;&rsqb; of intrinsic viscosity &lsqb;&eegr;&rsqb; of propylene/&agr;-olefin random copolymer(B) and intrinsic viscosity &lsqb;&eegr;&rsqb; of crystalline propylene polymer(A) being 0.3 to 1.2, and said film having specified range of water vapor permeability, oxygen gas permeability and ethylene gas permeability.

Breathing film

A propylene block copolymer composition is disclosed which comprises (A) a propylene-&agr;-olefin random copolymer with a propylene content of 99.4 to 99.9 mol % and (B) a propylene-&agr;-olefin random copolymer with a propylene content of 35 to 60 mol %, &agr;-olefin contained in the random copolymer (A) being ethylene and/or 1-butene, wherein the intrinsic viscosity (&lsqb;&eegr; &rsqb;) of the propylene-&agr;-olefin random copolymer (B) ranges from 0.5 to 2.0 dl/g, the ratio (&lsqb;&eegr; &rsqb;/&lsqb;&eegr; &rsqb;) of the intrinsic viscosity (&lsqb;&eegr; &rsqb;) of the propylene-&agr;-olefin random copolymer (B) to the intrinsic viscosity (&lsqb;&eegr; &rsqb;) of the propylene-&agr;-olefin random copolymer (A) ranges from 0.3 to 1.2 and the product ((&lsqb;&eegr; &rsqb;/&lsqb;&eegr; &rsqb;)&times;(W /W )) of the intrinsic viscosity ratio (&lsqb;&eegr; &rsqb;/&lsqb;&eegr; &rsqb;) and the weight ratio (W /W ) of both copolymers ranges from 1.0 to 3.0. The propylene block copolymer composition is suitable as a raw material for molded article having excellent see-through property, transparency, stress-whitening resistance, stiffness and heat resistance.

Propylene block copolymer compositions

Film having gas permeability

Growing community of inventors

Ichihara, Japan

Takanori Nakashima