Patents by Inventor Yoshiyuki Ishihama
Yoshiyuki Ishihama has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 8080624Abstract: A propylene-based polymer which is suitably applicable to foam molding, sheet molding, blow molding or the like, because of having good flow characteristics, high melt tension, high swell ratio and thus good molding workability. It is attained by a propylene-based polymer or the like characterized by satisfying the following requirements (i) to (vi). Requirement (i): MFR is 0.1 g/10 minutes to 100 g/10 minutes. Requirement (ii): Q value by GPC is 3.5 to 10.5. Requirement (iii): ratio of components with a molecular weight of equal to or higher than 2,000,000, in a molecular weight distribution curve obtained by GPC, is equal to or larger than 0.4% by weight and less than 10% by weight. Requirement (iv): components, which elute at a temperature of equal to or lower than 40° C., are equal to or less than 3.0% by weight, in temperature rising elution fractionation by ODCB. Requirement (v): isotactic triad fraction (mm) measured with 13C-NMR is equal to or higher than 95%.Type: GrantFiled: May 16, 2008Date of Patent: December 20, 2011Assignee: Japan Polypropylene CorporationInventors: Masaaki Ito, Hideshi Uchino, Yoshiyuki Ishihama, Masaru Aoki, Masato Nakano, Fusaaki Katou, Kazuo Asuka
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Publication number: 20100227987Abstract: A propylene-based polymer which is suitably applicable to foam molding, sheet molding, blow molding or the like, because of having good flow characteristics, high melt tension, high swell ratio and thus good molding workability. It is attained by a propylene-based polymer or the like characterized by satisfying the following requirements (i) to (vi). Requirement (i): MFR is 0.1 g/10 minutes to 100 g/10 minutes. Requirement (ii): Q value by GPC is 3.5 to 10.5. Requirement (iii): ratio of components with a molecular weight of equal to or higher than 2,000,000, in a molecular weight distribution curve obtained by GPC, is equal to or larger than 0.4% by weight and less than 10% by weight. Requirement (iv): components, which elute at a temperature of equal to or lower than 40° C., are equal to or less than 3.0% by weight, in temperature rising elution fractionation by ODCB. Requirement (v): isotactic triad fraction (mm) measured with 13C-NMR is equal to or higher than 95%.Type: ApplicationFiled: May 16, 2008Publication date: September 9, 2010Applicant: JAPAN POLYPROPYLENE CORPORATIONInventors: Masaaki Ito, Hideshi Uchino, Yoshiyuki Ishihama, Masaru Aoki, Masato Nakano, Fusaaki Katou, Kazuo Asuka
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Patent number: 6953831Abstract: An ethylene polymer excellent in molding processability represented by uniform extensibility, drawdown resistance, swell and extrudability, and mechanical properties represented by rigidity, impact resistance and ESCR, is provided. Particularly, an ethylene polymer remarkably excelent in balance between rigidity and ESCR as compared with a conventionally known ethylene polymer is provided. An ethylene polymer, which is an ethylene homopolymer or a copolymer of ethylene with an ?-olefin having a carbon number of from 3 to 20, and which satisfies the following conditions (1) to (4): (1) the melt index (HLMI) under a load of 21.6 kg at 190° C. is from 0.1 to 1000 g/10 min, (2) the density (d) is from 0.935 to 0.985 g/cm3, (3) the relation between HLMI and d satisfies the following formula (i): d?0.00900×log(HLMI)+0.951, (4) the relation between ESCR and the flexural modulus (M) satisfies the following formula (ii): M??7310×log(ESCR)+32300.Type: GrantFiled: December 21, 2001Date of Patent: October 11, 2005Assignee: Japan Polychem CorporationInventors: Yoshiyuki Ishihama, Toshihiko Sugano, Masayuki Yamazaki, Kou Obata
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Patent number: 6943227Abstract: The present invention provides a catalyst for olefin polymerization having high olefin polymerization activity without being accompanied by generation of an adhered polymer on the wall of a polymerization reactor and the wall of pipe line and generation of a locking massive polymer, and capable of manufacturing an olefin polymer industrially and stably for a long period of time. That is, the present invention related to a catalyst for olefin polymerization comprising [A1] a hafnium compound or a zirconium compound having at least one conjugated 5-membered ring ligand, [A2] a zirconium compound having at least one conjugated 5-membered ring ligand but different from [A1], and [B] phyllosilicate, and relates to a method of polymerizing or copolymerizing olefin in the presence of the catalyst.Type: GrantFiled: June 26, 2002Date of Patent: September 13, 2005Assignee: Japan Polypropylene CorporationInventors: Yoshiyuki Ishihama, Toshihiko Sugano
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Publication number: 20040176242Abstract: The present invention provides a catalyst for olefin polymerization having high olefin polymerization activity without being accompanied by generation of an adhered polymer on the wall of a polymerization reactor and the wall of pipe line and generation of a blocking massive polymer, and capable of manufacturing an olefin polymer industrially and stably for a long period of time.Type: ApplicationFiled: December 29, 2003Publication date: September 9, 2004Inventors: Yoshiyuki Ishihama, Toshihiko Sugano
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Publication number: 20040048993Abstract: An ethylene polymer excellent in molding processability represented by uniform extensibility, drawdown resistance, swell and extrudability, and mechanical properties represented by rigidity, impact resistance and ESCR, is provided. Particularly, an ethylene polymer remarkably excellent in balance between rigidity and ESCR as compared with a conventionally known ethylene polymer is provided.Type: ApplicationFiled: June 19, 2003Publication date: March 11, 2004Inventors: Yoshiyuki Ishihama, Toshihiko Sugano, Masayuki Yamazaki, Kou Obata
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Patent number: 6677411Abstract: A catalyst component for olefin polymerization, which comprises an ion-exchange layered silicate having the following features 1 and 2: feature 1: in a pore size distribution curve calculated from desorption isotherm by nitrogen adsorption-desorption method, a pore diameter Dm showing a maximum peak intensity DVM is from 60 to 200 Å; and feature 2: in a pore size distribution curve calculated from desorption isotherm by nitrogen adsorption-desorption method, a pore diameter Dm1/2 (Å) on the smaller pore size side corresponding to a ½ peak intensity of the maximum peak intensity DVM has a relation of Dm1/2/Dm of at least 0.65 and less than 1, provided that the largest value is employed when there are a plurality of Dm1/2 values.Type: GrantFiled: May 6, 2002Date of Patent: January 13, 2004Assignee: Japan Polychem CorporationInventors: Hideshi Uchino, Hiroshi Nakano, Shuuichi Toriu, Takao Tayano, Hirotugu Niwa, Yoshiyuki Ishihama, Toshihiko Sugano
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Patent number: 6632911Abstract: An ethylene/&agr;-olefin copolymer having a density of 0.900 to 0.965 g/cm3; having an MI of 0.01 to 100 g/10 minutes; in a chromatogram with the use of Rayleigh ratio obtained by extrapolating GPC-MALLS data at a scattering angle of 0°, showing an average {overscore (Mc)} obtained by measuring five times of 0.5% or more and a standard deviation <&sgr;> from the average of 35% or less, wherein Mc stands for the chromatographic area ratio of the components having molecular weight of 1,000,000 or more calculated on the basis of the above measurement; and having a W30 (weight fraction of the portion eluted below 30° C.) in CFC measurement of 1 (% by weight) or less; and a film thereof.Type: GrantFiled: November 3, 2000Date of Patent: October 14, 2003Assignee: Japan Polychem CorporationInventors: Kuninori Takahashi, Yoshiyuki Ishihama, Etsushi Akashige, Fumiyo Ikehata, Hisao Uchida, Mikio Kawase
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Publication number: 20030027950Abstract: A catalyst component for olefin polymerization, which comprises an ion-exchange layered silicate having the following features 1 and 2:Type: ApplicationFiled: May 6, 2002Publication date: February 6, 2003Inventors: Hideshi Uchino, Hiroshi Nakano, Shuuichi Toriu, Takao Tayano, Hirotugu Niwa, Yoshiyuki Ishihama, Toshihiko Sugano
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Patent number: 6448356Abstract: An ethylene-&agr;-olefin copolymer which is a copolymer of ethylene with a C3-20 &agr;-olefin and which satisfies the following conditions (a) to (c): (a) the density (D) is from 0.850 to 0.950 g/cm3, (b) the relation between the melt tension (MT) and the melt flow rate (MFR) at 190° C. satisfies the following formula (1): log(MT)≧−0.91×log(MFR)+0.06 (1), and (c) the following three formulae (2), (3) and (4) are satisfied: Tmax≦972D−813 (2) logW60≦−0.114 Tmax+9.48 (3) logW90≧0.0394 Tmax−2.95 (4) where D is the density, Tmax is the elution peak temperature (°C.) by the cross fractionation measurement, W60 is the weight percentage (wt %) of a soluble content at 60° C. or lower, and W90 is the weight percentage (wt %) of a soluble content at 90° C. or higher.Type: GrantFiled: August 20, 2001Date of Patent: September 10, 2002Assignee: Mitsubishi Chemical CorporationInventors: Yumito Uehara, Yoshiyuki Ishihama, Yukitaka Goto
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Publication number: 20020035227Abstract: An ethylene-&agr;-olefin copolymer which is a copolymer of ethylene with a C3-20 &agr;-olefin and which satisfies the following conditions (a) to (c):Type: ApplicationFiled: August 20, 2001Publication date: March 21, 2002Applicant: Mitsubishi Chemical CorporationInventors: Yumito Uehara, Yoshiyuki Ishihama, Yukitaka Goto
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Patent number: 6353063Abstract: A process for producing a polyolefin in the presence of a transition metal-containing metallocene catalyst that maintains stable operation for long periods of time without suffering from adhesion of the produced polymer to the wall of a reactor or formation of a sheet-like polymer or a massive polymer. The process utilizes a transition metal-containing metallocene catalyst and an organoaluminum compound represented by formula: R1nAl(OR2)3−n, wherein R1 represents a C1-20 alkyl group, an aryl group, hydrogen or halogen; R2 represents a C1-20 alkyl group or an aryl group; and n is a number selected from 0≦n<3, under conditions such that the temperature of the wall of a polymerization reactor, Tw (° C.), and the polymerization temperature, Tr (° C.), satisfy the relationship: 0.5<Tr−Tw<10.Type: GrantFiled: March 24, 2000Date of Patent: March 5, 2002Assignee: Japan Polychem CorporationInventors: Masafumi Shimizu, Yoshiyuki Ishihama, Akihira Watanabe
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Patent number: 5973084Abstract: A method for polymerizing olefins which comprises using a catalyst which comprises, as the essential components, (A) a metallocene-type transition metal compound and (B) at least one member selected from the group consisting of (1) an ion-exchanging layered compound other than a silicate and (2) an inorganic silicate, which is obtained by salt-treatment and/or acid-treatment and which has a water content of not higher than 1% by weight.Type: GrantFiled: August 25, 1998Date of Patent: October 26, 1999Assignee: Mitsubishi Chemical CorporationInventors: Yoshinori Suga, Yumito Uehara, Yasuo Maruyama, Eiji Isobe, Yoshiyuki Ishihama, Takehiro Sagae
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Patent number: 5928982Abstract: A catalyst for polymerizing an olefin, which comprises (A) a metallocene transition metal compound, (B) (1) an ion-exchanging layered compound other than a silicate or (2) an inorganic silicate prepared by treating a starting ion-exchanging layer compound other than a silicate or a starting silicate with a salt, an acid, or a combination thereof, said component (B) having a water content not higher than 1% by weight which is obtained by heat-dehydrating component (B) under an inert gas atmosphere or under reduced pressure, and (C) an organoaluminum compound.Type: GrantFiled: July 31, 1996Date of Patent: July 27, 1999Assignee: Mitsubishi Chemical CorporationInventors: Yoshinori Suga, Yumito Uehara, Yasuo Maruyama, Eiji Isobe, Yoshiyuki Ishihama, Takehiro Sagae