Patents by Inventor Godo Sakamoto
Godo Sakamoto 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: 7811673Abstract: To provide a novel high strength polyethylene multifilament which consists of a plurality of filaments having high strengths and uniform internal structures, and showing a narrow variation in the strengths of the monofilaments, and which has been difficult to be provided by the conventional gel spinning method. A high strength polyethylene multifilament consisting of a plurality of filaments which are characterized in that the crystal size of monoclinic crystal is 9 nm or less; the stress Raman shift factor is ?5.0 cm?1/(cN/dTex) or more; the average strength is 20 CN/dTex or higher; the knot strength retention of each monofilament is 40% or higher; CV indicating a variation in the strengths of the monofilaments is 25% or lower; the elongation at break is from 2.5% inclusive to 6.0% inclusive; the fineness of each filament is 10 dTex or less; and the melting point of the filaments is 145° C. or higher.Type: GrantFiled: March 12, 2004Date of Patent: October 12, 2010Assignee: Toyo Boseki Kabushiki KaishaInventors: Godo Sakamoto, Tooru Kitagawa, Yasuo Ohta, Yasunori Fukushima, Hiroki Murase
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Patent number: 7736564Abstract: A filament having excellent incision resistance includes as a primary component a polyethylene filament having a weight-average molecular weight of 300,000 or less and a ratio of a weight-average molecular weight to a number-average molecular weight (Mw/Mn) of 4.0 or less as determined in the state of a filament as well as a modulus of 500 cN/dtex or more. This filament is useful to produce a fabric excellent in incision resistance, a fibrous material for reinforcing mortar or concrete, and a rope, each of which comprises the filament. The filament can be produced by drawing a non-drawn polyolefin filament which comprises a polyethylene having a weight-average molecular weight of 60,000-600,000, a ratio of a weight-average molecular weight to a number-average molecular weight (Mw/Mn) of 4.5 or less, and a rate of birefringence (?n) of 0.008 or more, at a temperature not higher than the ?-relaxation temperature of the non-drawn filament.Type: GrantFiled: March 20, 2007Date of Patent: June 15, 2010Assignee: Toyo Boseki Kabushiki KaishaInventors: Godo Sakamoto, Syoji Oda, Hiroki Murase
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Publication number: 20090269581Abstract: A polyethylene fiber having high strength and extremely high productivity is difficult to obtain by conventional gel spinning methods. This high strength polyethylene fiber includes an ultrahigh molecular weight polyethylene resin having an intrinsic viscosity of 8 dL/g or more and contains a poor solvent in an amount of 10 ppm or more with respect to the resin. This high strength polyethylene fiber may also contain an ultrahigh molecular weight polyethylene resin having an intrinsic viscosity of 8 dL/g or more in which the resin contains a non-solvent in which the resin is insoluble in an amount of 10 ppm or more.Type: ApplicationFiled: March 22, 2007Publication date: October 29, 2009Applicant: Toyo Boseki Kabushiki KaishaInventors: Yasunori Fukushima, Godo Sakamoto, Ihachiro Iba
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Publication number: 20070237951Abstract: A polyethylene fiber having high strength, which was not easily obtained by methods such as the conventional gel spinning method, includes crystals derived from a monoclinic crystal having a size of 9 nm or more. The tensile strength of the fiber can be 30 cN/dtex or more. This high strength polyethylene fiber is produced by mixing an ultrahigh molecular weight polyethylene with a mixed solvent of a good solvent for polyethylene and a poor solvent for polyethylene to form a polyethylene dope, extruding the dope through an orifice, cooling the extruded dope, and drawing it into a filament yarn.Type: ApplicationFiled: April 5, 2007Publication date: October 11, 2007Applicant: Toyo Boseki Kabushiki KaishaInventors: Godo Sakamoto, Yasunori Fukushima
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Publication number: 20070190321Abstract: A filament having excellent incision resistance includes as a primary component a polyethylene filament having a weight-average molecular weight of 300,000 or less and a ratio of a weight-average molecular weight to a number-average molecular weight (Mw/Mn) of 4.0 or less as determined in the state of a filament as well as a modulus of 500 cN/dtex or more. This filament is useful to produce a fabric excellent in incision resistance, a fibrous material for reinforcing mortar or concrete, and a rope, each of which comprises the filament. The filament can be produced by drawing a non-drawn polyolefin filament which comprises a polyethylene having a weight-average molecular weight of 60,000-600,000, a ratio of a weight-average molecular weight to a number-average molecular weight (Mw/Mn) of 4.5 or less, and a rate of birefringence (?n) of 0.008 or more, at a temperature not higher than the ?-relaxation temperature of the non-drawn filament.Type: ApplicationFiled: March 20, 2007Publication date: August 16, 2007Applicant: Toyo Boseki Kabushiki KaishaInventors: Godo Sakamoto, Syoji Oda, Hiroki Murase
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Patent number: 7247372Abstract: The invention relates to a filament excellent in incision resistance comprising as a primary component a polyethylene filament having a weight-average molecular weight of 300,000 or less and a ratio of a weight-average molecular weight to a number-average molecular weight (Mw/Mn) of 4.0 or less as determined in the state of a filament as well as a modulus of 500 cN/dtex or more, and to a fabric excellent in incision resistance, a fibrous material for reinforcing cement mortar or concrete, and a rope, each of which comprises the filament. The filament can be produced by drawing a non-drawn polyolefin filament which comprises a polyethylene having a weight-average molecular weight of 60,000-600,000, a ratio of a weight-average molecular weight to a number-average molecular weight (Mw/Mn) of 4.5 or less, and a rate of birefringence (?n) of 0.008 or more, at a temperature not higher than the ?-relaxation temperature of said non-drawn filament.Type: GrantFiled: April 4, 2003Date of Patent: July 24, 2007Assignee: Toyo Boseki Kabushiki KaishaInventors: Godo Sakamoto, Syoji Oda, Hiroki Murase
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Publication number: 20070148452Abstract: PURPOSE: To provide a novel high strength polyethylene multifilament which consists of a plurality of filaments having high strengths and uniform internal structures, and showing a narrow variation in the strengths of the monofilaments, and which has been difficult to be provided by the conventional gel spinning method. SOLUTION: A high strength polyethylene multifilament consisting of a plurality of filaments which are characterized in that the crystal size of monoclinic crystal is 9 nm or less; the stress Raman shift factor is ?5.0 cm?1/(cN/dTex) or more; the average strength is 20 CN/dTex or higher; the knot strength retention of each monofilament is 40% or higher; CV indicating a variation in the strengths of the monofilaments is 25% or lower; the elongation at break is from 2.5% inclusive to 6.0% inclusive; the fineness of each filament is 10 dTex or less; and the melting point of the filaments is 145° C. or higher.Type: ApplicationFiled: March 12, 2004Publication date: June 28, 2007Inventors: Godo Sakamoto, Tooru Kitagawa, Yasuo Ohta, Yasunori Fukushima, Hiroki Murase
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Patent number: 7141301Abstract: A high strength polyethylene filament, wherein said filament has a fineness of 1.5 dtex or less as a monofilament, a tensile strength of 15 cN/dtex or more and a tensile elastic modulus of 300 cN/dtex or more, and, the rate of dispersion-defective fibers cut from the filament is 2% or less, is disclosed, and a high strength polyethylene filament, wherein said filament has a tensile strength of 15 cN/dtex or more and a tensile elastic modulus of 300 cN/dtex or more, and, a long period structure of 100 ? or less is observed in an X-ray small angle scattering pattern is disclosed.Type: GrantFiled: April 15, 2005Date of Patent: November 28, 2006Assignee: Toyo Boseki Kabushiki KaishaInventors: Godo Sakamoto, Tooru Kitagawa, Syoji Oda, Yasuo Ohta
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Patent number: 7056579Abstract: A high strength polyethylene filament having tenacity of at least 15 cN/dTex, which comprises a polyethylene having a weight-average molecular weight of 300,000 or less and a ratio of a weight-average molecular weight to a number-average molecular weight (Mw/Mn) of 4.0 or less as determined in a state of the filament, and containing 0.01 to 3.0 branched chains per 1,000 backbone carbon atoms. When cut fibers are obtained by cutting the polyethylene filament, a rate of dispersion-defective fibers is 2.0% or less.Type: GrantFiled: August 2, 2002Date of Patent: June 6, 2006Assignee: Toyo Boseki Kabushiki KaishaInventors: Godo Sakamoto, Syoji Oda, Yoshihiko Teramoto
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Publication number: 20050238875Abstract: A high strength polyethylene filament, wherein said filament has a fineness of 1.5 dtex or less as a monofilament, a tensile strength of 15 cN/dtex or more and a tensile elastic modulus of 300 cN/dtex or more, and, the rate of dispersion-defective fibers cut from the filament is 2% or less, is disclosed, and a high strength polyethylene filament, wherein said filament has a tensile strength of 15 cN/dtex or more and a tensile elastic modulus of 300 cN/dtex or more, and, a long period structure of 100 ? or less is observed in an X-ray small angle scattering pattern is disclosed.Type: ApplicationFiled: April 15, 2005Publication date: October 27, 2005Applicant: Toyo Boseki Kabushiki KaishaInventors: Godo Sakamoto, Tooru Kitagawa, Syoji Oda, Yasuo Ohta
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Patent number: 6958187Abstract: High strength polyethylene fibers and their applications, for example, chopped fibers, ropes, nets, ballistic materials or items, protective gloves, fiber reinforced concrete products, helmets, and other products obtained therefrom, in which the fiber is characterized in that: it contains a high molecular weight polyethylene consisting essentially of a repeating unit of ethylene; it has an intrinsic viscosity number of 5 or larger and an average strength of 22 cN/dtex or higher; and the measurement of the fiber by differential scanning calorimetry (DSC) exhibits a temperature-increasing DCS curve having at least one endothermic peak over a temperature region of 140° C. to 148° C. (on the low temperature side) and at least one endothermic peak over a temperature region of 148° C.Type: GrantFiled: April 2, 2003Date of Patent: October 25, 2005Assignee: Toyo Boseki Kabushiki KaishaInventors: Yasuo Ohta, Godo Sakamoto, Tadayo Miyasaka, Takayoshi Okano, Junichi Nakahashi, Yukihiro Nomura, Takuya Konishi
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Publication number: 20050118418Abstract: The invention relates to a filament excellent in incision resistance comprising as a primary component a polyethylene filament having a weight-average molecular weight of 300,000 or less and a ratio of a weight-average molecular weight to a number-average molecular weight (Mw/Mn) of 4.0 or less as determined in the state of a filament as well as a modulus of 500 cN/dtex or more, and to a fabric excellent in incision resistance, a fibrous material for reinforcing cement mortar or concrete, and a rope, each of which comprises the filament. The filament can be produced by drawing a non-drawn polyolefin filament which comprises a polyethylene having a weight-average molecular weight of 60,000-600,000, a ratio of a weight-average molecular weight to a number-average molecular weight (Mw/Mn) of 4.5 or less, and a rate of birefringence (?n) of 0.008 or more, at a temperature not higher than the ?-relaxation temperature of said non-drawn filament.Type: ApplicationFiled: April 4, 2003Publication date: June 2, 2005Applicant: TOYO BOSEKI KABUSHIKE KAISHAInventors: Godo Sakamoto, Syoji Oda, Hiroki Murase
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Patent number: 6899950Abstract: A high strength polyethylene filament, wherein said filament has a fineness of 1.5 dtex or less as a monofilament, a tensile strength of 15 cN/dtex or more and a tensile elastic modulus of 300 cN/dtex or more, and, the rate of dispersion-defective fibers cut from the filament is 2% or less, is disclosed, and a high strength polyethylene filament, wherein said filament has a tensile strength of 15 cN/dtex or more and a tensile elastic modulus of 300 cN/dtex or more, and, a long period structure of 100 ? or less is observed in an X-ray small angle scattering pattern is disclosed.Type: GrantFiled: December 7, 2001Date of Patent: May 31, 2005Assignee: Toyo Boseki Kabushiki KaishaInventors: Godo Sakamoto, Tooru Kitagawa, Syoji Oda, Yasuo Ohta
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Publication number: 20050003182Abstract: A high strength polyethylene filament having tenacity of at least 15 cN/dTex, which comprises a polyethylene having a weight-average molecular weight of 300,000 or less and a ratio of a weight-average molecular weight to a number-average molecular weight (Mw/Mn) of 4.0 or less as determined in a state of the filament, and containing 0.01 to 3.0 branched chains per 1,000 backbone carbon atoms. When cut fibers are obtained by cutting the polyethylene filament, a rate of dispersion-defective fibers is 2.0% or less.Type: ApplicationFiled: August 2, 2002Publication date: January 6, 2005Inventors: Godo Sakamoto, Syoji Oda, Yoshihiko Teramoto
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Patent number: 6770363Abstract: High strength polyethylene fibers and their applications, for example, chopped fibers, ropes, nets, ballistic materials or items, protective gloves, fiber reinforced concrete products, helmets, and other products obtained therefrom, in which the fiber is characterized in that: it contains a high molecular weight polyethylene consisting essentially of a repeating unit of ethylene; it has an intrinsic viscosity number of 5 or larger and an average strength of 22 cN/dtex or higher; and the measurement of the fiber by differential scanning calorimetry (DSC) exhibits a temperature-increasing DCS curve having at least one endothermic peak over a temperature region of 140° C. to 148° C. (on the low temperature side) and at least one endothermic peak over a temperature region of 148° C.Type: GrantFiled: April 2, 2003Date of Patent: August 3, 2004Assignee: Toyo Boseki Kabushiki KaishaInventors: Takuya Konishi, Yasuo Ohta, Godo Sakamoto
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Publication number: 20040062926Abstract: A high strength polyethylene filament, wherein said filament has a fineness of 1.5 dtex or less as a monofilament, a tensile strength of 15 cN/dtex or more and a tensile elastic modulus of 300 cN/dtex or more, and, the rate of dispersion-defective fibers cut from the filament is 2% or less, is disclosed, and a high strength polyethylene filament, wherein said filament has a tensile strength of 15 cN/dtex or more and a tensile elastic modulus of 300 cN/dtex or more, and, a long period structure of 100 Å or less is observed in an X-ray small angle scattering pattern is disclosed.Type: ApplicationFiled: October 15, 2003Publication date: April 1, 2004Inventors: Godo Sakamoto, Tooru Kitagawa, Syoji Oda, Yasuo Ohta
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Patent number: 6689462Abstract: The invention relates to high-strength polyethylene fibers of mainly ethylene component having an intrinsic viscosity [&eegr;], when fibrous, of no less than 5, and having a strength of no less than 20 g/d and an elasticity modulus of no less than 500 g/d, and, in the measurement of the temperature variance of the dynamic viscoelasticity of the fibers, the &ggr; dispersion loss modulus peak temperature is no greater than −110° C. and the loss tangent (tan &dgr;) is no greater than 0.03.Type: GrantFiled: May 12, 2003Date of Patent: February 10, 2004Assignee: DSM N.V.Inventors: Yasuo Ohta, Godo Sakamoto
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Patent number: 6669889Abstract: The invention relates to high-strength polyethylene fibers of mainly ethylene component having an intrinsic viscosity [&eegr;], when fibrous, of no less than 5, and having a strength of no less than 20 g/d and an elasticity modulus of no less than 500 g/d, and, in the measurement of the temperature variance of the dynamic viscoelasticity of the fibers, the &ggr; dispersion loss modulus peak temperature is no greater than −110° C. and the loss tangent (tan &dgr;) is no greater than 0.03.Type: GrantFiled: March 13, 2001Date of Patent: December 30, 2003Assignee: DSM N.V.Inventors: Yasuo Ohta, Godo Sakamoto
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Publication number: 20030211321Abstract: High strength polyethylene fibers and their applications, for example, chopped fibers, ropes, nets, ballistic materials or items, protective gloves, fiber reinforced concrete products, helmets, and other products obtained therefrom, in which the fiber is characterized in that: it contains a high molecular weight polyethylene consisting essentially of a repeating unit of ethylene; it has an intrinsic viscosity number of 5 or larger and an average strength of 22 cN/dtex or higher; and the measurement of the fiber by differential scanning calorimetry (DSC) exhibits a temperature-increasing DCS curve having at least one endothermic peak over a temperature region of 140° C. to 148° C. (on the low temperature side) and at least one endothermic peak over a temperature region of 148° C.Type: ApplicationFiled: April 2, 2003Publication date: November 13, 2003Applicant: Toyo Boseki Kabushiki KaishaInventors: Yasuo Ohta, Godo Sakamoto, Tadayo Miyasaka, Takayoshi Okano, Junichi Nakahashi, Yukihiro Nomura, Takuya Konishi
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Publication number: 20030207074Abstract: High strength polyethylene fibers and their applications, for example, chopped fibers, ropes, nets, ballistic materials or items, protective gloves, fiber reinforced concrete products, helmets, and other products obtained therefrom, in which the fiber is characterized in that: it contains a high molecular weight polyethylene consisting essentially of a repeating unit of ethylene; it has an intrinsic viscosity number of 5 or larger and an average strength of 22 cN/dtex or higher; and the measurement of the fiber by differential scanning calorimetry (DSC) exhibits a temperature-increasing DCS curve having at least one endothermic peak over a temperature region of 140° C. to 148° C. (on the low temperature side) and at least one endothermic peak over a temperature region of 148° C.Type: ApplicationFiled: April 2, 2003Publication date: November 6, 2003Applicant: Toyo Boseki Kabushiki KaishaInventors: Yasuo Ohta, Godo Sakamoto, Tadayo Miyasaka, Takayoshi Okano, Junichi Nakahashi, Yukihiro Nomura, Takuya Konishi