Patents Assigned to Japan Polyolefins Co., Ltd.
-
Patent number: 7354655Abstract: An object of the present invention is to provide an adhesive resin composition which displays excellent adhesive strength on bonding to a barrier material, during initial adhesion, durable adhesion, and even after soak in fuel oil, and which also has excellent moldability. Furthermore, another object of the present is to provide an adhesive resin composition which when recycled, displays good compatible in a regrind layer with polyethylene resins and barrier materials such as saponified products of ethylene-vinyl acetate copolymers or polyamide based resins, and which is consequently capable of suppressing deterioration in the low temperature impact resistance of a multi-layer vessel containing a regrind layer.Type: GrantFiled: November 26, 2002Date of Patent: April 8, 2008Assignee: Japan Polyolefins Co., Ltd.Inventors: Tatsuo Yamaguchi, Shinji Miwa, Fumio Asada, Kenichi Hiraki, Naoki Minorikawa
-
Patent number: 7166178Abstract: A high-quality protective film for a dry film resist is provided. A film of a polyethylene is used as the protective film, the polyethylene being prepared by pressurizing ethylene with use of an ultra-high pressure compressor and then polymerizing the ethylene at a reaction temperature of 190° to 300° C. and a reaction pressure of not lower than 167 MPa in the presence of a radical polymerization initiator, or by pressuring ethylene with use of an ultra-high pressure compressor and then polymerizing the ethylene at a reaction temperature of 190° to 300° C. in the presence of a radical polymerization initiator while allowing a radical polymerization inhibitor to be present in the reaction system.Type: GrantFiled: June 11, 2003Date of Patent: January 23, 2007Assignee: Japan Polyolefins Co., LtdInventors: Katsuaki Tsutsumi, Isao Hashimoto
-
Patent number: 6919135Abstract: A paper container is produced that has gas barrier properties, by employing a laminate having at least a (I) paper layer 101, a (II) gas barrier layer 103, and an (III) epoxy-group-containing resin composition layer 104. The (III) epoxy-group-containing resin composition layer consists of a resin composition that contains a polyolefin (a) having a melt flow rate of 0.1˜100 g/min and an epoxy-compound (b) which has two or more epoxy groups in the molecule and has a molecular weight of 3000 or less, epoxy-compound (b) being added in an amount of 0.01˜5 parts by weight with respect to 100 parts by weight of polyolefin (a). This (III) epoxy-group-containing resin composition layer has good adhesion with the (II) gas barrier layer, thus a laminate can be produced without employing a dry laminate adhesive agent or an extrusion laminate anchor agent. Accordingly, it is possible to avoid a deterioration in the work environment or an odor remaining in the final product from the use of organic solvents.Type: GrantFiled: July 21, 2003Date of Patent: July 19, 2005Assignee: Japan Polyolefins Co., Ltd.Inventor: Hiroshi Kasahara
-
Patent number: 6767600Abstract: A paper container is produced that has gas barrier properties, by employing a laminate having at least a (I) paper layer 101, a (II) gas barrier layer 103, and an (III) epoxy-group-containing resin composition layer 104. The (III) epoxy-group-containing resin composition layer consists of a resin composition that contains a polyolefin (a) having a melt flow rate of 0.1˜100 g/min and an epoxy-compound (b) which has two or more epoxy groups in the molecule and has a molecular weight of 3000 or less, epoxy-compound (b) being added in an amount of 0.01˜5 parts by weight with respect to 100 parts by weight of polyolefin (a). This (III) epoxy-group-containing resin composition layer has good adhesion with the (II) gas barrier layer, thus a laminate can be produced without employing a dry laminate adhesive agent or an extrusion laminate anchor agent. Accordingly, it is possible to avoid a deterioration in the work environment or an odor remaining in the final product from the use of organic solvents.Type: GrantFiled: January 24, 2001Date of Patent: July 27, 2004Assignee: Japan Polyolefins Co., Ltd.Inventor: Hiroshi Kasahara
-
Patent number: 6716385Abstract: Ethylene (co)polymers each having specified values of (a) density, (b) molecular weight distribution (Mw/Mn), (c) relationship between die swell (DS) and shear rate (&ggr;) in a region of shear rate ({dot over (&ggr;)}), (d) relationship between stress (&sgr;) and maximum stress (&sgr; max) in a stress-strain curve in uniaxial stretching, (e) the ratio of sample diameter to initial sample diameter and the time for sample breakage during uniaxial stretching under a constant tension, blow molding process in which the thickness of a parison is adjusted by using the said ethylene (co)polymer, and the method of improving fire resistance in moldings, laminates and hollow moldings made by using the same.Type: GrantFiled: June 6, 2002Date of Patent: April 6, 2004Assignee: Japan Polyolefins Co., Ltd.Inventors: Koichi Ogawa, Haruhiko Kondou, Kei Takahashi, Daizo Tabuchi, Satoshi Kanazawa
-
Publication number: 20040018326Abstract: A paper container is produced that has gas barrier properties, by employing a laminate having at least a (I) paper layer 101, a (II) gas barrier layer 103, and an (III) epoxy-group-containing resin composition layer 104. The (III) epoxy-group-containing resin composition layer consists of a resin composition that contains a polyolefin (a) having a melt flow rate of 0.1˜100 g/min and an epoxy-compound (b) which has two or more epoxy groups in the molecule and has a molecular weight of 3000 or less, epoxy-compound (b) being added in an amount of 0.01˜5 parts by weight with respect to 100 parts by weight of polyolefin (a). This (III) epoxy-group-containing resin composition layer has good adhesion with the (II) gas barrier layer, thus a laminate can be produced without employing a dry laminate adhesive agent or an extrusion laminate anchor agent. Accordingly, it is possible to avoid a deterioration in the work environment or an odor remaining in the final product from the use of organic solvents.Type: ApplicationFiled: July 21, 2003Publication date: January 29, 2004Applicant: JAPAN POLYOLEFINS CO., LTD.Inventor: Hiroshi Kasahara
-
Patent number: 6664346Abstract: A high-quality protective film for a dry film resist is provided. A film of a polyethylene is used as the protective film, the polyethylene being prepared by pressurizing ethylene with use of an ultra-high pressure compressor and then polymerizing the ethylene at a reaction temperature of 190° to 300° C. and a reaction pressure of not lower than 167 MPa in the presence of a radical polymerization initiator, or by pressuring ethylene with use of an ultra-high pressure compressor and then polymerizing the ethylene at a reaction temperature of 190° to 300° C. in the presence of a radical polymerization initiator while allowing a radical polymerization inhibitor to be present in the reaction system.Type: GrantFiled: December 13, 2000Date of Patent: December 16, 2003Assignee: Japan Polyolefins Co., Ltd.Inventors: Katsuaki Tsutsumi, Isao Hashimoto
-
Patent number: 6646069Abstract: The invention relates to a method for producing an ethylene polymer, comprising performing polymerization of ethylene in co-presence of hydrogen using a trialkylaluminum compound-carried chromium catalyst, wherein the chromium catalyst is obtained by calcination-activating a chromium compound that is carried on an inorganic oxide carrier in a non-reducing atmosphere to convert chromium atoms in the chromium compound into hexavalent chromium atoms for at least a portion thereof, and treating with a trialkylaluminum compound in an inert hydrocarbon solvent to carry thereon and removing to dry the solvent so that the chromium atoms are not over-reduced by the trialkylaluminum compound, and to an ethylene polymer suitable for blow molded articles obtained by the production method. The ethylene polymer of the invention have improved environment stress crack resistance (ESCR) and impact resistance in a good balance and are suitable for molded blow articles, in particular large size blow molded articles.Type: GrantFiled: July 6, 2001Date of Patent: November 11, 2003Assignee: Japan Polyolefins Co., Ltd.Inventors: Takashi Monoi, Hidenobu Torigoe
-
Publication number: 20030175538Abstract: An object of the present invention is to provide an adhesive resin composition which displays excellent adhesive strength on bonding to a barrier material, during initial adhesion, durable adhesion, and even after soak in fuel oil, and which also has excellent moldability. Furthermore, another object of the present is to provide an adhesive resin composition which when recycled, displays good compatible in a regrind layer with polyethylene resins and barrier materials such as saponified products of ethylene-vinyl acetate copolymers or polyamide based resins, and which is consequently capable of suppressing deterioration in the low temperature impact resistance of a multi-layer vessel containing a regrind layer.Type: ApplicationFiled: November 26, 2002Publication date: September 18, 2003Applicant: JAPAN POLYOLEFINS CO., LTD.Inventors: Tatsuo Yamaguchi, Shinji Miwa, Fumio Asada, Kenichi Hiraki, Naoki Minorikawa
-
Patent number: 6589645Abstract: The present invention relates to a laminated member comprising a polyethylene resin composition layer having a very high adhesive strength to a substrate, and a method for manufacturing the same. The present invention is directed to a method for manufacturing the laminated member, which has a high adhesive strength to a different kind of substrate within a range from low to high temperature, and can reduce the resin temperature during the extrusion-lamination molding and inhibit any noxious influence on the working and surrounding environments, and is also superior in terms of high-speed mold ability at low temperature, and the laminated member. In the present invention, a compound having a specific structure is incorporated into a polyethylene resin composition layer. The present invention can be used to particular advantage in laminate products such as packaging material.Type: GrantFiled: March 29, 2001Date of Patent: July 8, 2003Assignees: Fuji Photo Film Co., Ltd., Japan Polyolefins Co., Ltd.Inventors: Kazuo Ozaki, Tadahiro Kegasawa, Ryuichi Katsumoto, Takumi Araki, Toshio Taka
-
Publication number: 20030054126Abstract: Ethylene (co)polymers each having specified values of (a) density, (b) molecular weight distribution (Mw/Mn), (c) relationship between die swell (DS) and shear rate (&ggr;) in a region of shear rate (&ggr;), (d) relationship between stress (&sgr;) and maximum stress (&sgr;max) in a stress-strain curve in uniaxial stretching, (e) the ratio of sample diameter to initial sample diameter and the time for sample breakage during uniaxial stretching under a constant tension, blow molding process in which the thickness of aparison is adjusted by using the said ethylene (co)polymer, and the method of improving fire resistance in moldings, laminates and hollow moldings made by using the same.Type: ApplicationFiled: June 6, 2002Publication date: March 20, 2003Applicant: JAPAN POLYOLEFINS CO., LTD.Inventors: Koichi Ogawa, Haruhiko Kondou, Kei Takahashi, Daizo Tabuchi, Satoshi Kanazawa
-
Patent number: 6521734Abstract: The invention relates to a low-density polyethylene resin for laminates, a composition thereof, and a laminate and production method therefor. The low-density polyethylene resin is one obtainable by a high pressure radical polymerization method and has a density of 0.910 to 0.935 g/cm3, a melt flow rate of 0.1 to 300 g/10 min., and a terminal vinyl group number of 0.4 or more per 1,000 carbon atoms. According to the invention, a laminate having high interlayer adhesion strength can be obtained also by low-temperature, high-speed molding so that the occurrence of smoking and odor can be prevented. Also, the resin is excellent in productivity and economics. Further, the resin is excellent in productivity and economics because it can be readily made thinner. The laminate is suitable for application to, for example, food wrapping materials, containers, etc.Type: GrantFiled: March 30, 2000Date of Patent: February 18, 2003Assignee: Japan Polyolefins Co., Ltd.Inventors: Takumi Araki, Isao Hashimoto, Toshio Taka
-
Patent number: 6518375Abstract: A catalyst for the production of an ethylene polymer comprising a specific trivalent alkyl chromium compound, an inorganic oxide solid and optionally an organoaluminum compound (first catalyst), a catalyst for the production of an ethylene polymer comprising the specific trivalent alkyl chromium compound, a specific tetravalent alkyl chromium compound and an inorganic oxide solid (second catalyst) and a process for producing an ethylene polymer using those catalysts. The first catalyst of the present invention does not cause deterioration with the passage of time, is stable to heat and light, has greatly improved activity and can efficiently produce an ethylene copolymer with &agr;-olefin.Type: GrantFiled: April 3, 2000Date of Patent: February 11, 2003Assignee: Japan Polyolefins Co., Ltd.Inventors: Takashi Monoi, Haruhiko Ikeda, Hidenobu Torigoe
-
Patent number: 6492475Abstract: The present invention relates to an ethylene-&agr;-olefin copolymer; a composition thereof; a film thereof; a polar group-containing resin material; and productions and use of the ethylene-&agr;-olefin copolymer. The ethylene-&agr;-olefin copolymer of the present invention is characterized in satisfying the following conditions (A) to (E): (A) a density in the range of 0.92 to 0.96 g/cm3; (B) a melt flow rate (MFR) in the range of 0.01 to 200 g/10 min; (C) a molecular weight distribution (Mw/Mn) in the range of 1.5 to 5.Type: GrantFiled: December 19, 2000Date of Patent: December 10, 2002Assignee: Japan Polyolefins Co., Ltd.Inventors: Toshiaki Egashira, Reiji Higuchi, Kazuyuki Sakamoto, Kimiya Miyoshi, Masahiro Wakayama, Tatsuo Yamaguchi, Fumio Asada, Sinji Miwa, Kenichi Hiraki, Masaaki Ikeda, Yoshimi Shimizu
-
Patent number: 6479590Abstract: The present invention relates to a resin material for an electrical insulating material, an electrical insulating material and electric wire and cable using the same. A resin material for an electrical insulating material according to present invention is characterized in that the resin component thereof comprises an ethylene &agr;-olefin copolymer (A) which satisfies specific conditions, such as a density of 0.92˜0.96 g/cm3, a melt flow rate (MFR) of 0.01˜200 g/10 minutes, a molecular weight distribution (Mw/Mn) of 1.5˜5.0, and possessing only one peak in terms of the number of peaks observed in an elution temperature-eluted amount curve as measured by the temperature raising elution fractionation (TREF) method, etc.Type: GrantFiled: March 16, 2001Date of Patent: November 12, 2002Assignee: Japan Polyolefins Co., Ltd.Inventors: Masaaki Ikeda, Yoshimi Shimizu
-
Publication number: 20020146582Abstract: A high-quality protective film for a dry film resist is provided. A film of a polyethylene is used as the protective film, the polyethylene being prepared by pressurizing ethylene with use of an ultra-high pressure compressor and then polymerizing the ethylene at a reaction temperature of 190° to 300° C. and a reaction pressure of not lower than 167 MPa in the presence of a radical polymerization initiator, or by pressuring ethylene with use of an ultra-high pressure compressor and then polymerizing the ethylene at a reaction temperature of 190° to 300° C. in the presence of a radical polymerization initiator while allowing a radical polymerization inhibitor to be present in the reaction system.Type: ApplicationFiled: December 13, 2000Publication date: October 10, 2002Applicant: JAPAN POLYOLEFINS CO. LTD.Inventors: Katsuaki Tsutsumi, Isao Hashimoto
-
Patent number: 6448312Abstract: A colored resin composition for water pipes which comprises (A) a polyethylene resin and (B) specific amounts of (i) a cobalt blue pigment, (ii) at least one selected from phthalocyanine pigments having no metals and metal phthalocyanine pigments having no chlorine atoms or one chlorine atom in a molecule, (iii) a dioxazine pigment and (iv) a titanium dioxide pigment and a colored water pipe which comprises the colored polyethylene resin composition and has a color tone within a specific color solid expressed by the values of the Munsell standard color table before and after the test of resistance to chlorine water for 500 hours. The composition and the water pipe are colored in a bluish color and exhibits an excellent hiding property, excellent fastness of the color tone of the coloring component to water containing chlorine and an excellent property for preventing formation of blisters in water containing chlorine.Type: GrantFiled: October 11, 2001Date of Patent: September 10, 2002Assignees: High Tech Chem Co., Ltd., Japan Polyolefins Co., Ltd.Inventors: Kotaro Oshima, Tohru Matsuoka, Yozo Nagai, Mitsuo Nakamura
-
Patent number: 6423808Abstract: A laminate containing a polyolefin resin composition containing ethylene-&agr;-olefin copolymer having: (A) a density d of 0.86 to 0.96 g/cm3; (B) a melt flow rate MFR of 0.01 to 200 g/10 min; (C) a molecular weight distribution Mw/Mn of 1.5 to 4.5; (D) a composition distribution parameter Cb of 1.08 to 2.00; and (E) an orthodichlorobenzene-soluble content X (wt %), at 25° C. a density of d (g/cm3) and a melt flow rate MFR (g/10 min) satisfying that: (i) when the density (d) and the melt flow rate MFR satisfy relationship (I): d−0.008×log MFR≧0.93 (I) the orthodichlorobenzene-soluble content X satisfies relationship (II): X<2.0 (II) (ii) when the density d and the melt flow rate MFR satisfy relationship (III): d−0.008×log MFR<0.93 (II) the orthodichlorobenzene-soluble content X satisfies relationship (IV): X<9.8×103×(0.9300−d+0.008×log MFR)2+2.Type: GrantFiled: August 22, 2000Date of Patent: July 23, 2002Assignee: Japan Polyolefins Co., Ltd.Inventors: Hideo Watanabe, Masahiko Sato, Masaaki Ikeda, Takaaki Hattori, Yoshihiro Hatakeyama, Naoki Miwa, Tatsuyuki Kamiya, Hisao Sakuma, Yuka Umeshima
-
Publication number: 20020042482Abstract: The invention relates to a method for producing an ethylene polymer, comprising performing polymerization of ethylene in co-presence of hydrogen using a trialkylaluminum compound-carried chromium catalyst, wherein the chromium catalyst is obtained by calcination-activating a chromium compound that is carried on an inorganic oxide carrier in a non-reducing atmosphere to convert chromium atoms in the chromium compound into hexavalent chromium atoms for at least a portion thereof, and treating with a trialkylaluminum compound in an inert hydrocarbon solvent to carry thereon and removing to dry the solvent so that the chromium atoms are not over-reduced by the trialkylaluminum compound, and to an ethylene polymer suitable for blow molded articles obtained by the production method. The ethylene polymer of the invention have improved environment stress crack resistance (ESCR) and impact resistance in a good balance and are suitable for molded blow articles, in particular large size blow molded articles.Type: ApplicationFiled: July 6, 2001Publication date: April 11, 2002Applicant: JAPAN POLYOLEFINS CO., LTD.Inventors: Takashi Monoi, Hidenobu Torigoe
-
Patent number: 6352953Abstract: 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: GrantFiled: October 9, 2000Date of Patent: March 5, 2002Assignee: Japan Polyolefins Co., Ltd.Inventors: Takashi Seki, Hiroyuki Shimizu, Akira Sano