Patents Assigned to Japan Polyolefins Co.
  • Patent number: 6352953
    Abstract: Disclosed is a novel transition metal composition of a metaracycle structure represented by the formula wherein M1 is an element of Group IVB in the Periodic Table, M2 is an element of Group IIIA in the Periodic Table, R1 and R2 each are for instance a cyclopentadienyl group, R3 and R4 each are for instance a hydrocarbon group, R5 and R6 each are a hydrogen atom and R7 and R8 indicate an indan ring formed by bonding to each other.
    Type: Grant
    Filed: October 9, 2000
    Date of Patent: March 5, 2002
    Assignee: Japan Polyolefins Co., Ltd.
    Inventors: Takashi Seki, Hiroyuki Shimizu, Akira Sano
  • Patent number: 6303714
    Abstract: The present invention provides an olefin polymerization catalyst component comprising a transition metal compound represented by general formula (1) LmCpnMX1X2  (1) an olefin polymerization catalyst containing the catalyst component as a transition metal component, and a method of producing a polyolefin using the catalyst. According to the present invention, polyolefins having a wide molecular weight distribution and excellent moldability and containing small amounts of low molecular weight components can be produced with high activity.
    Type: Grant
    Filed: February 22, 1999
    Date of Patent: October 16, 2001
    Assignee: Japan Polyolefins Co., Ltd.
    Inventors: Nobuyuki Kibino, Kiyotaka Ishida, Tsugihiko Hakozaki, Tsutomu Sakuragi, Shigenobu Miyake, Shintaro Inazawa
  • Patent number: 6271167
    Abstract: Disclosed are a catalyst for polymerizing olefins containing a solid catalyst component containing titanium, magnesium and halogen as essential components (component (A)); an organic aluminum compound (component (B)); and a silane compound (component (C)) represented by general formula (1) wherein R1 and R2 independently represent a straight, branched or cyclic saturated aliphatic hydrocarbon group or a silyl group, a method of preparing polyolefins using the catalyst as well as novel trimethoxysilane compounds represented by the general formula (1) in which R1 is a straight saturated aliphatic hydrocarbon group having 2 to 10 carbon atoms, and R2 represents a methyl group. Use of the catalyst enables efficient production of polyolefins having a low molecular weight (MFR>20 (g/10 minutes)), a broad molecular weight distribution (MLMFR/MFR>22) and a high stereoregularity when applied to polymerization of olefins having 3 or more carbon atoms.
    Type: Grant
    Filed: January 5, 2000
    Date of Patent: August 7, 2001
    Assignee: Japan Polyolefins Co., Ltd.
    Inventors: Masaki Fushimi, Toshio Fujita, Shintaro Inazawa
  • Patent number: 6191227
    Abstract: A polyethylene resin superior in both moldability and long-term physical properties and suitable for both pipe and pipe joint, the polyethylene resin having a density of 0.915 to 0.955 g·cm−3, a melt flow rate of not more than 0.20 dg·min as measured at 190° C. and at a load of 2.16 kgf, a melt flow rate of 17.0 to 70.0 dg·min−1 as measured at 190° C. and at a load of 21.6 kgf, a zero shear viscosity (&eegr;0) of 200,000 to 2,000,000 Pa·s, a characteristic time constant (&tgr;0) of 50 to 500 sec., and a ratio (&tgr;0/&eegr;0) of 1.0×10−4 to 4.0×10−4 Pa−1, the zero shear viscosity (&eegr;0) being obtained by approximating a dynamic melt viscosity (&eegr;*, unit: Pa·s) with equation [1], the dynamic melt viscosity (&eegr;*) being obtained by measurement using a rheometer at 190° C., at a parallel plate spacing of 1.5 mm, at a distortion of 10% to 15% and in the frequency (&ohgr;) range of 100 to 0.
    Type: Grant
    Filed: August 6, 1997
    Date of Patent: February 20, 2001
    Assignee: Japan Polyolefins Co., Ltd.
    Inventors: Tohru Matsuoka, Kiyofumi Matsuoka, Fumiaki Naka, Kiyonobu Sato
  • Patent number: 6166136
    Abstract: A resin composition utilizing coated resin moldings, the resin composition comprising 100 parts by weight of a crushed material of coated polyolefin resin moldings compounded with from 3 to 15 parts by weight of an ethylene polymer having a weight average molecular weight of from 50,000 to 180,000.
    Type: Grant
    Filed: July 21, 1998
    Date of Patent: December 26, 2000
    Assignees: Japan Polyolefins Co., Ltd., Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Hirofumi Murakami, Kazuhiko Sakai, Akihiro Katagiri, Yoshio Kitawaki, Takashi Nakayama, Kazuo Ito, Atushi Takeuchi, Minoru Makuta, Hitoshi Ohgane, Kenji Hamabe, Osamu Aoki
  • Patent number: 6162887
    Abstract: A highly crystalline polypropylene having a degree of crystallinity of at least 50.5% calculated from the heat of melting; and a relationship between a proportion f(R)of R-lamella with respect to spherulites and a weight-average molecular weight Mw which satisfies the following Formula (II). The above-mentioned proportion f(R) of R-lamella spherulites is calculated using the following Formula (I) from the birefringence .DELTA.n of crystallized spherulites obtained by melting said highly crystalline polypropylene at 230.degree. C. for 5 minutes, cooling to a temperature of 132.degree. C. at a cooling rate of 20.degree. C./minute, and then maintaining said temperature for 90 minutes.
    Type: Grant
    Filed: March 30, 1998
    Date of Patent: December 19, 2000
    Assignee: Japan Polyolefins Co., Ltd.
    Inventors: Koji Yamada, Yoshiharu Iwasaki
  • Patent number: 6150544
    Abstract: Disclosed is a novel transition metal composition of a metallacycle structure represented by the formula ##STR1## wherein M.sup.1 is an element of Group IVB in the Periodic Table, M.sup.2 is an element of Group IIIA in the Periodic Table, R.sup.1 and R.sup.2 each are for instance a cyclopentadienyl group, R.sup.3 and R.sup.4 each are for instance a hydrocarbon group, R5 and R6 each are a hydrogen atom and R7 and R8 indicate an indan ring formed by bonding to each other.
    Type: Grant
    Filed: January 13, 1999
    Date of Patent: November 21, 2000
    Assignee: Japan Polyolefins Co., Ltd.
    Inventors: Takashi Seki, Hiroyuki Shimizu, Akira Sano
  • Patent number: 6096844
    Abstract: A catalyst for olefin polymerization comprising: (A) a solid catalyst component comprising a titanium compound, a magnesium compound, and a halogen compound; (B) an organoaluminum compound; (C) a first organosilicon compound represented by formula (I): ##STR1## wherein R.sup.1 represents a hydrocarbon group having 1 to 4 carbon atoms; R.sup.2 represents a hydrocarbon group having 1 to 6 carbon atoms or a hydrogen atom; R.sup.3 and R.sup.4 each represent a hydrocarbon group having 1 to 6 carbon atoms; and R.sup.2, R.sup.3, and R.sup.4 may be the same or different; and (D) a second organosilicon compound represented by formula (II): ##STR2## wherein R.sup.5 represents a hydrocarbon group having 1 to 4 carbon atoms; and R.sup.6, R.sup.7, and R.sup.8, which may be the same or different, each represent a hydrocarbon group having 1 to 6 carbon atoms or a hydrogen atom.
    Type: Grant
    Filed: August 19, 1998
    Date of Patent: August 1, 2000
    Assignee: Japan Polyolefins Co., Ltd.
    Inventors: Masaki Fushimi, Yasushi Kuroda, Shintaro Inazawa
  • Patent number: 6063727
    Abstract: Disclosed are a catalyst for polymerizing olefins containing a solid catalyst component containing titanium, magnesium and halogen as essential components (component (A)); an organic aluminum compound (component (B)); and a silane compound (component (C)) represented by general formula (1) ##STR1## wherein R.sup.1 and R.sup.2 independently represent a straight, branched or cyclic saturated aliphatic hydrocarbon group or a silyl group, a method of preparing polyolefins using the catalyst as well as novel trimethoxysilane compounds represented by the general formula (1) in which R.sup.1 is a straight saturated aliphatic hydrocarbon group having 2 to 10 carbon atoms, and R.sup.2 represents a methyl group. Use of the catalyst enables efficient production of polyolefins having a low molecular weight (MFR>20 (g/10 minutes)), a broad molecular weight distribution (MLMFR/MFR>22) and a high stereoregularity when applied to polymerization of olefins having 3 or more carbon atoms.
    Type: Grant
    Filed: June 4, 1997
    Date of Patent: May 16, 2000
    Assignee: Japan Polyolefins Co., Ltd.
    Inventors: Masaki Fushimi, Toshio Fujita, Shintaro Inazawa
  • Patent number: 6040399
    Abstract: An ethylene base polymer and a preparation method of an ethylene base polymer characterized in use of a catalyst comprising a chromium amide compound, a solid inroganic oxide calcined at 100 to 500.degree. C. and alumoxane. According to the present invention, an ethylene base polymer with a wide molecular weight distribution, excellent shock and environmental stress cracking resistances, causing no melt fracture, and suitable for film forming and blow molding can be effectively prepared.
    Type: Grant
    Filed: March 30, 1998
    Date of Patent: March 21, 2000
    Assignee: Japan Polyolefins Co., Ltd.
    Inventors: Takashi Monoi, Masakazu Yamamoto, Hidenobu Torigoe, Yasunori Takemoto
  • Patent number: 5902765
    Abstract: Solid catalyst components for olefin polymerization which comprise a solid carrier components comprising a solid substance having the general formulaMgX.sub.2.(E).sub.n ( 1)wherein X is a halogen atom, E is a monoether compound and n is 0.01.about.4, at least a portion of said E being replaced by an eletron donative compound different from said monoether compound (E), and a titanium compound and these catalyst components can produce an olefin polymer having a high stereoregularity in a high polymer yield per unit of a catalyst component in olefin polymerization.
    Type: Grant
    Filed: February 14, 1997
    Date of Patent: May 11, 1999
    Assignee: Japan Polyolefins Co., Ltd.
    Inventors: Hirotoshi Takahashi, Yasushi Kuroda, Masaki Fushimi, Shintaro Inazawa
  • Patent number: 5889100
    Abstract: A resin composition comprising: (A) a polypropylene polymer comprising a propylene/ethylene block copolymer, said polypropylene polymer having a melt flow rate of from 5 to 100 g/10 min as measured at 230.degree. C. under a load of 2.16 kg and containing components extractable with xylene at 20.degree. C., wherein the xylene-extractable components having an intrinsic viscosity as measured at 140.degree. C. in decalin of from 2.0 to 5.0 g/dl; (B) an ethylene/propylene rubber having a propylene content of from 40 to 60% by weight and a melt flow rate of from 0.5 to 10 g/10 min as measured at 230.degree. C. under a load of 2.16 kg; (C) a triblock copolymer having a melt flow rate of from more than 40 to 200 g/10 min as measured at 230.degree. C. under a load of 2.16 kg, a flat interface between said triblock copolymer and the 100.degree. C. xylene-insoluble components of said polypropylene polymer of ingredient (A) having a critical energy release rate of 20 J/m.sup.
    Type: Grant
    Filed: September 26, 1997
    Date of Patent: March 30, 1999
    Assignees: Japan Polyolefins Co., Ltd., Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Kunihiko Asai, Tomio Takada, Hideo Yamamoto, Kunio Yamamoto, Yoshihisa Saiki, Takeshi Ogawa
  • Patent number: 5885920
    Abstract: A process for producing a catalyst carrier for an olefin polymerization comprising:(i) passing a mixture to be emulsified comprised of (A) a halogenated magnesium adduct and (B) a dispersion medium through an emulsifying apparatus comprised of (1) a conduit for passage of the mixture to be emulsified, (2) a vibrator element disposed in the conduit and vibrating in the axial direction of the conduit, and (3) a vibration device for giving the vibration movement to the vibrator element; and(ii) quenching the resultant mixture.
    Type: Grant
    Filed: November 22, 1995
    Date of Patent: March 23, 1999
    Assignee: Japan Polyolefins Co., Ltd.
    Inventors: Hirotoshi Takahashi, Yasushi Kuroda, Shinya Waki, Hisayoshi Yanagihara, Koichi Sekiya
  • Patent number: 5849654
    Abstract: A catalyst for olefin polymerization comprising: (A) a solid catalyst component comprising a titanium compound, a magnesium compound, and a halogen compound; (B) an organoaluminum compound; (C) a first organosilicon compound represented by formula (I): ##STR1## wherein R.sup.1 represents a hydrocarbon group having 1 to 4 carbon atoms; R.sup.2 represents a hydrocarbon group having 1 to 6 carbon atoms or a hydrogen atom; R.sup.3 and R.sup.4 each represent a hydrocarbon group having 1 to 6 carbon atoms; and R.sup.2, R.sup.3, and R.sup.4 may be the same or different; and (D) a second organosilicon compound represented by formula (II): ##STR2## wherein R.sup.5 represents a hydrocarbon group having 1 to 4 carbon atoms; and R.sup.6, R.sup.7, and R.sup.8, which may be the same or different, each represent a hydrocarbon group having 1 to 6 carbon atoms or a hydrogen atom.
    Type: Grant
    Filed: November 27, 1995
    Date of Patent: December 15, 1998
    Assignee: Japan Polyolefins Co., Ltd.
    Inventors: Masaki Fushimi, Yasushi Kuroda, Shintaro Inazawa
  • Patent number: 5817420
    Abstract: A multilayer resin molding, utilizing coated resin moldings, composed of a core material and a surface layer covering the core material, the core material being composed of a resin composition which comprises 100 parts by weight of a crushed material of coated polyolefin resin moldings compounded with from 3 to 15 parts by weight of an ethylene polymer having a weight average molecular weight of from 50,000 to 180,000 and the surface layer comprising a polypropylene resin composition comprising from 30 to 80% by weight of a propylene polymer, from 3 to 20% by weight of a propylene polymer modified with an unsaturated hydroxy compound, from 15 to 40% by weight of a thermoplastic elastomer, and from 0.1 to 10% by weight of an oligomer having a functional group at the terminal thereof.
    Type: Grant
    Filed: September 30, 1996
    Date of Patent: October 6, 1998
    Assignees: Japan Polyolefins Co., Ltd., Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Hirofumi Murakami, Kazuhiko Sakai, Akihiro Katagiri, Yoshio Kitawaki, Takashi Nakayama, Kazuo Ito, Atushi Takeuchi, Minoru Makuta, Hitoshi Ohgane, Kenji Hamabe, Osamu Aoki
  • Patent number: 5770664
    Abstract: A catalyst component for producing polyolefin, a catalyst for producing polyolefin using the catalyst component, and a process for producing polyolefin in the presence of the catalyst. The catalyst component comprises a metallocene compound represented by formula (1): ##STR1## All the symbols in formula (1) are defined in the description.
    Type: Grant
    Filed: May 13, 1997
    Date of Patent: June 23, 1998
    Assignee: Japan Polyolefins Co., Ltd.
    Inventors: Yoshikuni Okumura, Nobuyuki Kibino, Tetsuya Maki, Akihiro Hori, Kiyotaka Ishida, Shigenobu Miyake, Shintaro Inazawa
  • Patent number: 5760141
    Abstract: A propylene block copolymer, a process for preparation of the propylene block copolymer, and a propylene resin composition comprising the propylene block copolymer. The propylene block copolymer comprises (a) from 35 to 95% by weight of a polypropylene block and (b) from 10 to 65% by weight of a block of a copolymer of a propylene and other .alpha.-olefins, the propylene block copolymer having: (i) in a crystallization temperature curve determined by a differential scanning calorimeter, besides a main peak, secondary peaks in a temperature range of from 90.degree. to 100.degree. C., and a proportion of the area of the secondary peaks to that of a main peak of from 1.5 to 10%; and (ii) a relationship between an amount of a soluble content on xylene extraction at 25.degree. C. and a proportion of the area of the secondary peaks to that of the main peak represented by equation (I):0.1X.sub.IS -1.ltoreq.SMA (I)wherein X.sub.IS represents an amount of a soluble content on xylene extraction at 25.degree. C.
    Type: Grant
    Filed: June 26, 1996
    Date of Patent: June 2, 1998
    Assignee: Japan Polyolefins Co., Ltd.
    Inventors: Kazuyuki Watanabe, Hisayoshi Yanagihara