Patents by Inventor Hidetoshi Okawa
Hidetoshi Okawa 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: 10494748Abstract: A non-woven fabric that absorbs only a small amount of volatile low molecular weight compound, and that has good texture when used as a non-woven fabric that makes contact with human skin. This thermal bond non-woven fabric containing cyclic olefin resin includes at least: fibers (A) containing at least 50 mass % of a cyclic olefin resin (A1) having a glass transition temperature TgA1° C.; and fibers (B) containing at least 10 mass % of either a cyclic olefin resin (B1) having a glass transition temperature TgB1° C., or a crystalline thermoplastic resin (B2) having a melting point MpB2° C.; the fibers (A) and the fibers (B) being heat-spliced together; wherein TgA1>TgB1 or TgA1>MpB2, and either the difference between the glass transition temperature TgA1° C. and the glass transition temperature TgB1° C. or the difference between the glass transition temperature TgA1° C. and the melting point MpB2° C. exceeds 20° C.Type: GrantFiled: May 10, 2016Date of Patent: December 3, 2019Assignee: Polyplastics Co., Ltd.Inventor: Hidetoshi Okawa
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Publication number: 20180154619Abstract: A low-adsorptivity packaging bag equipped with a sealant layer that satisfies all of the following: heat-sealability, low adsorptivity, cuttability, and water-vapor barrier properties. A low-adsorptivity packaging bag for storing contents containing a low-molecular-weight volatile compound, in which a layered body provided with a substrate layer including one or more layers and a sealant layer containing a cyclic olefin resin having a glass transition temperature of 50-190° C., inclusive, is formed as a result of heat-sealing with the sealant layer side as the inside surface thereof.Type: ApplicationFiled: May 10, 2016Publication date: June 7, 2018Inventor: Hidetoshi OKAWA
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Publication number: 20180105964Abstract: A non-woven fabric that absorbs only a small amount of volatile low molecular weight compound, and that has good texture when used as a non-woven fabric that makes contact with human skin. This thermal bond non-woven fabric containing cyclic olefin resin includes at least: fibers (A) containing at least 50 mass % of a cyclic olefin resin (A1) having a glass transition temperature TgA1° C.; and fibers (B) containing at least 10 mass % of either a cyclic olefin resin (B1) having a glass transition temperature TgB1° C., or a crystalline thermoplastic resin (B2) having a melting point MpB2° C.; the fibers (A) and the fibers (B) being heat-spliced together; wherein TgA1>TgB1 or TgA1>MpB2, and either the difference between the glass transition temperature TgA1° C. and the glass transition temperature TgB1° C. or the difference between the glass transition temperature TgA1° C. and the melting point MpB2° C. exceeds 20° C.Type: ApplicationFiled: May 10, 2016Publication date: April 19, 2018Inventor: Hidetoshi OKAWA
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Publication number: 20110212660Abstract: Provided is a cyclic olefin-derived resin microfiber and a cyclic olefin-derived resin non-woven fabric. A polymer solution containing a volatile solvent and a cyclic olefin-derived resin is subjected to electrostatic spinning. The volatile solvent to be used preferably contains at least one solvent selected from the group consisting of chloroform, toluene, xylene, cyclohexane and decalin. In addition, by using a cyclic olefin-derived resin with a glass transition point of at least 160° C., high heat-resistance can be imparted to a cyclic olefin-derived resin fiber.Type: ApplicationFiled: November 4, 2009Publication date: September 1, 2011Applicant: POLYPLASTICS CO., LTD.Inventor: Hidetoshi Okawa
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Patent number: 7022280Abstract: A flat yarn of a high strength and a high modulus of elasticity, being excellent in solvent resistance, thermal stability and resistance to bending fatigue is provided. The flat yarn comprises polyoxymethylene copolymer containing 0.5 to 10 moles of specified oxyalkylene units per 100 moles of oxymethylene units in the polymer chain principally comprising repeating oxymethylene units and having a melt index at 190° C. with load of 2160 g of 0.3 to 20 g/10 min.Type: GrantFiled: December 3, 2002Date of Patent: April 4, 2006Assignee: Polyplastics Co., Ltd.Inventor: Hidetoshi Okawa
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Publication number: 20050182200Abstract: A polyacetal resin composition having high rigidity and also excellent in dimensional stability and creep characteristics is provided. A polyacetal resin composition prepared by blending (A) 99.9 to 90 parts by weight of a linear polyacetal resin having a melt index of 1 to 50 g/min obtained by copolymerizing (a) 99.5 to 97.5% by weight of trioxane and (b) 0.5 to 2.5% by weight of a compound selected from a mono-functional cyclic ether compound and a mono-functional cyclic formal compound, with (B) from 0.1 to 10 parts by weight of a branched or crosslinked polyacetal resin having a melt index of 0.1 to 10 g/min obtained by copolymerizing (a) 99.49 to 95.0% by weight of trioxane, (b) 0.5 to 4.0% by weight of a compound selected from a mono-functional cyclic ether compound and mono-functional cyclic formal compound and (c) 0.01 to 1.Type: ApplicationFiled: May 29, 2003Publication date: August 18, 2005Applicant: Polyplastics Co., Ltd.Inventors: Kuniaki Kawaguchi, Hidetoshi Okawa, Yoshihisa Tajima
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Publication number: 20050131198Abstract: A stretched product comprising a polyoxymethylene copolymer and having high strength and high elastic modulas is provided. A polyoxymethylene copolymer having a melt index (190° C., load: 2160 g) of from 0.3 to 20 g/10 min and containing, in the polymer chain mainly comprising an oxymethylene repeating unit, a specific oxyalkylene unit in an amount of from 0.5 to 10 mol per 100 mol of the oxymethylene unit is melt-extruded to obtain a rod-like or hollow molded article and then the molded article is stretched under heating, thereby obtaining a stretched product having a sectional area of from 0.003 to 700 mm2.Type: ApplicationFiled: December 12, 2003Publication date: June 16, 2005Applicant: Polyplastics Co., Ltd.Inventor: Hidetoshi Okawa
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Patent number: 6818294Abstract: Polyoxymethylene fiber having a high strength and a high modulus of elasticity is provided. Polyoxymethylene fiber comprising polyoxymethylene copolymer having a half-crystallization time of at least 30 sec, when the polyoxymethylene copolymer is cooled from a melted state at 200° C. to 150° C. at a cooling speed of 80° C./min and maintained constantly at the temperature of 150° C.Type: GrantFiled: February 3, 2004Date of Patent: November 16, 2004Assignee: Polyplastics Co., Ltd.Inventors: Takeshi Kikutani, Hidetoshi Okawa
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Publication number: 20040175566Abstract: Polyoxymethylene fiber having a high strength and a high modulus of elasticity is provided. Polyoxymethylene fiber comprising polyoxymethylene copolymer having a half-crystallization time of at least 30 sec, when the polyoxymethylene copolymer is cooled from a melted state at 200° C. to 150° C. at a cooling speed of 80° C./min and maintained constantly at the temperature of 150° C.Type: ApplicationFiled: February 3, 2004Publication date: September 9, 2004Inventors: Takeshi Kikutani, Hidetoshi Okawa
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Patent number: 6753368Abstract: To provide a resin material in which various properties such as excellent appearance and rigidity inherent to a polyacetal resin are maintained and to which the antistatic property is given. That is, a branched polyacetal resin composition, comprising 100 parts by weight of a branched polyacetal copolymer (A) having an oxymethylene group as the main repeating unit and having a branching unit represented by the following formula (I), and 0.1 to 30 parts by weight of a compound (B) having a polyalkylene ether unit as the main constituting component and/or 0.01 to 10 parts by weight of an ester (C) of fatty acid with polyhydroxyl alcohol having a hydroxyl group: wherein m and n each is an integer of 0 to 5; the sum of m+n is 1 to 5; and R is a monovalent organic group having a molecular weight of 40 to 1000.Type: GrantFiled: July 5, 2001Date of Patent: June 22, 2004Assignee: Polyplastics Co., Ltd.Inventors: Hidetoshi Okawa, Kuniaki Kawaguchi, Yoshihisa Tajima
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Patent number: 6737475Abstract: To provide a polyacetal resin material in which an excellent sliding property is given and the appearance, dimensional precision, mechanical properties, etc. of the molded article thereof are improved as well. That is, a branched polyacetal resin composition, comprising 100 parts by weight of a branched polyacetal copolymer (A) having an oxymethylene group as the main repeating unit and having a specific branching unit, and 0.5 to 40 parts by weight of at least one polymer (B) selected from the group consisting of the following polymer (B-1) and (B-2), i.e. polymer (B-1): a graft or block copolymer prepared from an olefin polymer (b-1) and at least one vinyl polymer (b-2); and polymer (B-2): a modified olefin polymer in which an olefin polymer (b-3) is modified with at least one compound selected from the group consisting of an unsaturated carboxylic acid, an unsaturated carboxylic acid anhydride and derivatives thereof and/or 0.1 to 5 parts by weight of a lubricant (C).Type: GrantFiled: July 5, 2001Date of Patent: May 18, 2004Assignee: Polyplastics Co., Ltd.Inventors: Yoshihisa Tajima, Hidetoshi Okawa, Kuniaki Kawaguchi
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Patent number: 6642321Abstract: To provide a polyacetal resin composition which is highly rigid and has excellent surface hardness, sliding characteristics, etc. That is, a polyacetal resin composition, produced by blending 100 parts by weight of a polyacetal resin (A) with 0.01-100 part(s) by weight of a branched polyacetal copolymer (B) which is obtained by copolymerization of 100 parts by weight of trioxane (a), 0.01-10 part(s) by weight of a monofunctional glycidyl compound (b) and 0-20 part(s) by weight of a cyclic ether compound (c) which is copolymerizable with trioxane.Type: GrantFiled: March 23, 2001Date of Patent: November 4, 2003Assignee: Polyplastics Co., Ltd.Inventors: Hidetoshi Okawa, Yoshihisa Tajima, Kuniaki Kawaguchi
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Publication number: 20030129391Abstract: A flat yarn of a high strength and a high modulus of elasticity, being excellent in solvent resistance, thermal stability and resistance to bending fatigue is provided. The flat yarn comprises polyoxymethylene copolymer containing 0.5 to 10 moles of specified oxyalkylene units per 100 moles of oxymethylene units in the polymer chain principally comprising repeating oxymethylene units and having a melt index at 190° C. with load of 2160 g of 0.3 to 20 g/10 min.Type: ApplicationFiled: December 3, 2002Publication date: July 10, 2003Inventor: Hidetoshi Okawa
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Patent number: 6583203Abstract: To offer a resin material in which various properties such as excellent appearance and rigidity inherent to a polyacetal resin are maintained and a weather (light) resistance is improved. That is, a branched polyacetal resin composition comprising 100 parts by weight of a branched polyacetal copolymer (A) having an oxymethylene group as the main repeating unit and having a branching unit represented by the following formula (I), 0.01 to 5 parts by weight of a weather (light) resistant stabilizer (B) and 0.01 to 5 parts by weight of a hindered amine substance (C): wherein m and n each is an integer of 0 to 5; the sum of m+n is 1 to 5; and R is a monovalent organic group having a molecular weight of 40 to 1000.Type: GrantFiled: July 5, 2001Date of Patent: June 24, 2003Assignee: Polyplastics Co., Ltd.Inventors: Kuniaki Kawaguchi, Hidetoshi Okawa, Yoshihisa Tajima
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Publication number: 20020193469Abstract: To offer a resin material in which various properties such as excellent appearance and rigidity inherent to a polyacetal resin are maintained and a weather (light) resistance is improved. That is, a branched polyacetal resin composition comprising 100 parts by weight of a branched polyacetal copolymer (A) having an oxymethylene group as the main repeating unit and having a branching unit represented by the following formula (I), 0.01 to 5 parts by weight of a weather (light) resistant stabilizer (B) and 0.Type: ApplicationFiled: July 5, 2001Publication date: December 19, 2002Inventors: Kuniaki Kawaguchi, Hidetoshi Okawa, Yoshihisa Tajima
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Publication number: 20020193480Abstract: To provide a resin material in which various properties such as excellent appearance and rigidity inherent to a polyacetal resin are maintained and to which the antistatic property is given. That is, a branched polyacetal resin composition, comprising 100 parts by weight of a branched polyacetal copolymer (A) having an oxymethylene group as the main repeating unit and having a branching unit represented by the following formula (I), and 0.1 to 30 parts by weight of a compound (B) having a polyalkylene ether unit as the main constituting component and/or 0.Type: ApplicationFiled: July 5, 2001Publication date: December 19, 2002Inventors: Hidetoshi Okawa, Kuniaki Kawaguchi, Yoshihisa Tajima
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Patent number: 6426393Abstract: To provide polyacetal which has excellent shock resistance, rigidity and creep resistance as essential properties of the polymer and makes a high flowability and an excellent molding property upon molding possible by improving the thermal stability. In the manufacture of a polyacetal copolymer by a copolymerization of 100 parts by weight of trioxane (a) with 0.05-20 parts by weight of a cyclic ether compound (b) which is copolymerizable with trioxane and 0.001-10 parts by weight of a mono-functional glycidyl compound (c), the mono-functional glycidyl compound (c) having a chlorine content of not more than 0.3% by weight is used.Type: GrantFiled: February 1, 2001Date of Patent: July 30, 2002Assignee: Polyplastics Co., Ltd.Inventors: Yoshihisa Tajima, Hidetoshi Okawa
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Patent number: 6365704Abstract: To provide a resin material in which various properties of a polyacetal resin such as excellent appearance, slidability and thermal stability are maintained and a rigidity is improved as well. That is, a polyacetal copolymer which is prepared by a copolymerization of 100 parts by weight of trioxane (A), 0.0005 to 2 parts by weight of the component (B), which is a compound (B-1) having at least three glycidyl groups in the molecule or a compound (B-2) having at least two epoxy groups in the molecule, and 0 to 20 parts by weight of a cyclic ether compound (C) copolymerizable with trioxane, and which has a total terminal group amount of 15 to 150 mmol/kg, when (B) is (B-2).Type: GrantFiled: July 5, 2001Date of Patent: April 2, 2002Assignee: Polyplastics Co., Ltd.Inventors: Hidetoshi Okawa, Kaoru Yamamoto
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Patent number: 6255440Abstract: Polyacetal copolymers, obtained by copolymerizing (A) 100 parts by weight of trioxane, (B) 0.01 to 10 part(s) by weight of at least one compound selected from among glycidyl ether compounds of the following general formula (I), (II) or (III) and (C) 0 to 20 part(s) by weight of a cyclic ether compound [excluding the glydicyl ether compound (B)] copolymerizable with trioxane, are a polyacetal resin having a high rigidity, excellent creep properties, a high surface hardness and excellent sliding properties: wherein R1 is a C1-12 alkyl group, an aryl group or a substtituted aryl group; wherein R2 represents a C2-20 polyalkylene oxide glycol residue; wherein R4 represents an alkyl group having 1 to 30 carbon atoms; R5 represents an alkylene group having 1 to 30 carbon atoms.Type: GrantFiled: September 21, 2000Date of Patent: July 3, 2001Assignee: Polyplastics Co., Ltd.Inventors: Hidetoshi Okawa, Yoshihisa Tajima