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公开(公告)号：DE4243913C2
公开(公告)日：2000-10-05
申请号：DE4243913
申请日：1992-12-23
Applicant: GUNZE KK , AGENCY IND SCIENCE TECHN
Inventor： SHIMAMOTO TAKESHI , OKA TAKASHIGE , ADACHI MINORI , SUON HYU HYON , NAKAYAMA KAZUO , KAITO AKIRA
Abstract: Bone-treating devices made of biodegradable polymers having a high-density and a high-orientation along the major axis, which have a density of 1.260 g/cm3 or more (when measured by the sink and float method) and which possess the bending strength and the bending strength-retaining characteristic defined by the following equations: A>/=B>/=23 (kgf/mm2)(1) B/A>/=0.85(2) wherein A is the initial bending strength and B is the bending strength after 90-days immersion of the devices in a phosphate buffer at 37 DEG C. and preparing the same.
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公开(公告)号：DE68921030T2
公开(公告)日：1995-07-20
申请号：DE68921030
申请日：1989-08-17
Applicant: CHISSO CORP , AGENCY IND SCIENCE TECHN
Inventor： TAKASU HIROSHI , ARASE SUSUMU , YOKOTA JUNICHIRO , NAKAYAMA KAZUO
Abstract: The present invention provides a process for preparing rolled heat-treated films or sheets of a crystalline thermoplastic resin in which heat shrinkage is notably improved, formability is excellent and tensile strength in a transverse direction is increased. The process of the present invention comprises the steps of rolling a crystalline thermoplastic resin material through between pair of rolls at a temperature which is lower than the melting point of the resin material but higher than room temperature, and then successively subjecting the resin material to a heat treatment at a temperture which is higher than the rolling temperature but lower than the melting point of the resin material, the aforesaid process comprising that the heat treatment is carried out for a time (t: seconds) satisfying the formula wherein d is a thickness (mm) of the rolled films or sheets, r is a thickness reduction rate of the rolled films or sheets, Tr is the rolling temperature ( DEG C),Ta is the heat treatment temperature ( DEG C), and Tm is the melting point ( DEG C) of the crystalline resin.
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公开(公告)号：DE68921030D1
公开(公告)日：1995-03-23
申请号：DE68921030
申请日：1989-08-17
Applicant: CHISSO CORP , AGENCY IND SCIENCE TECHN
Inventor： TAKASU HIROSHI , ARASE SUSUMU , YOKOTA JUNICHIRO , NAKAYAMA KAZUO
Abstract: The present invention provides a process for preparing rolled heat-treated films or sheets of a crystalline thermoplastic resin in which heat shrinkage is notably improved, formability is excellent and tensile strength in a transverse direction is increased. The process of the present invention comprises the steps of rolling a crystalline thermoplastic resin material through between pair of rolls at a temperature which is lower than the melting point of the resin material but higher than room temperature, and then successively subjecting the resin material to a heat treatment at a temperture which is higher than the rolling temperature but lower than the melting point of the resin material, the aforesaid process comprising that the heat treatment is carried out for a time (t: seconds) satisfying the formula wherein d is a thickness (mm) of the rolled films or sheets, r is a thickness reduction rate of the rolled films or sheets, Tr is the rolling temperature ( DEG C),Ta is the heat treatment temperature ( DEG C), and Tm is the melting point ( DEG C) of the crystalline resin.
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公开(公告)号：DE4243913A1
公开(公告)日：1993-07-01
申请号：DE4243913
申请日：1992-12-23
Applicant: GUNZE KK , AGENCY IND SCIENCE TECHN
Inventor： SHIMAMOTO TAKESHI , OKA TAKASHIGE , ADACHI MINORI , SUON HYU HYON , NAKAYAMA KAZUO , KAITO AKIRA
Abstract: Fractured bones are held together in order to heal the fracture by means of pins made from a biologically degradable polymer of high density and with a high degree of orientation in the direction of the main molecular axis. The pins are formed by first heating pellets of the polymer to a temperature of 140 deg. C. and then extruding the material through a die of the appropriate diameter. The polymer has a density which is equal to or greater than 1.260 grm. per CC. and its physical properties are defined by the equations which define flexural strength and fatigue flexural strength. A is equal to or greater than B which is equal to or greater than 23 kg per sq. mm. and B/A is equal to or greater than 0.85 where A is the initial flexural strength and B is the flexural strength after a 90 day immersion of the pin in a phosphate buffer solution at 37 deg. C. ADVANTAGE - No operation is required to remove the pins after the fracture has healed.
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公开(公告)号：AU779638B2
公开(公告)日：2005-02-03
申请号：AU2522100
申请日：2000-03-31
Applicant: AGENCY IND SCIENCE TECHN
Inventor： OISHI AKIHIRO , TAGUCHI YOICHI , FUJITA KENICHI , IKEDA YOSHIKAZU , MASUDA TAKASHI , ISHIGAMI YUTAKA , NAKAYAMA KAZUO , KINUGASA SHINICHI , NAKAHARA HISAE
IPC: C08G63/08 , C08G63/78 , C08G63/82 , C08L101/16
Abstract: A process of producing a polyester or copolyester, wherein at least one cyclic lactone of the following formula (I): wherein n is an integer of 1-4 provided that n is not 2 when only one cyclic lactone is used, is polymerized under a pressure of at least 200 MPa in the absence of any catalyst or in the presence of a metal-free polyesterification catalyst.
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Patent Agency Ranking
公开(公告)号：JP2002105186A
公开(公告)日：2002-04-10
申请号：JP2000304241
申请日：2000-10-03
Applicant: AGENCY IND SCIENCE TECHN , DAICEL CHEM
Inventor： MASUDA TAKASHI , SO AMIN , NAKAYAMA KAZUO , SUZUKI KANAME , KATAYAMA HIROSHI
Abstract: PROBLEM TO BE SOLVED: To efficiently produce a high-molecular weight polybutylene succinate from 1,4-butanediol and succinic acid or its derivative. SOLUTION: A prepolymer formed by a prepolymerization process is further subjected to polycondensation by using a polymerizer equipped with a mixing blade, in a cylindrical vessel or a vessel having a conical lower part arranged in the vertical direction, comprising plural vertically piled twisted rectangular frame structures which are composed of two horizontal members A and B and two vertical members C and D arranged with keeping a very small gap from the wall surface of the vessel in which the lower horizontal member B is shifted from the upper horizontal member A by a phase of θ2 in the rotation direction or in the opposite direction and a horizontal member B1 below a frame structure positioned above is intersected with a horizontal member A2 above a frame structure adjacent to the frame structure positioned below at an angle of θ1 at the center of rotation and connected.
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7.发明专利
公开(公告)号：JP2000318100A
公开(公告)日：2000-11-21
申请号：JP13421099
申请日：1999-05-14
Applicant: AGENCY IND SCIENCE TECHN
Inventor： HIROTSU TOSHIHIRO , NAKAYAMA KAZUO , MASUDA TAKASHI
IPC: C08J7/04 , B32B27/30 , C08L67/04 , C08L101/00 , C08L101/16 , C23C14/12 , C23C14/22
Abstract: PROBLEM TO BE SOLVED: To effectively prevent a decrease in a mechanical strength based on characteristics such as a hydrophilic property of a biodegradable polymer in a biodegradable plastic molding, by laminating a copolymer thin film made of a fluorine organic compound containing a silicon compound of a predetermined ratio on the polymer. SOLUTION: A copolymer thin film made of a fluorine organic compound containing a silicon compound of a predetermined ratio is laminated on a biodegradable polymer to form a laminate. Then, the thin film is formed by plasma polymerizing a fluorine organic compound containing a silicon compound of a predetermined ratio. The silicon compound is selected from compounds such as a silane or the like, a siloxane or the like, silazane or the like. Further, a mixing ratio of the silicon compound to the fluorine organic compound is set to 0.1 to 0.8. The polymer is selected from a polylactic acid, a polycaprolactone, a poly(3-hydroxybutylate), a polyvinyl alcohol, a starch, a cellulose or the like.
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公开(公告)号：JPH11320674A
公开(公告)日：1999-11-24
申请号：JP2797699
申请日：1999-02-04
Applicant: AGENCY IND SCIENCE TECHN
Inventor： NAKAYAMA KAZUO , YASUKO KODAMA , SAI KON , LEON TEBEIK
Abstract: PROBLEM TO BE SOLVED: To enable imparting of the molecular chain orientation of a polylactic acid by drawing a sheet formed of a polymer blend composition containing the polylactic acid and poly(ε-caprolacton) as main components from a gap between a pair of rolls heated at a specific temperature and giving a specific stretch ratio to the film in the uniaxial direction. SOLUTION: A polymer blend composition sheet 3 obtained by melt-kneading a mixture of polylactic acid(L) and poly(ε-caprolacton(C) obtained by dry- blending beforehand, with the help of a biaxial extruder, is drawn from a gap between a pair of rolls 1 heated at a temperature Ts and the extruded sheet 3 is given a stretch ratio by a factor of 3 or more in the uniaxial direction. The temperature Ts is shown as [Tg(PLLA)×W(PLLA)+ Tm(PCL)-40}×W (PCL)]/100
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公开(公告)号：JPH0467935A
公开(公告)日：1992-03-03
申请号：JP18133690
申请日：1990-07-09
Applicant: FUJIKURA LTD , AGENCY IND SCIENCE TECHN
Inventor： TAKAHASHI KATSUHIKO , NAKAYAMA SHIRO , KUNIMURA SATOSHI , NAKAYAMA KAZUO , KAIDO AKIRA , SHIMIZU HIROSHI
Abstract: PURPOSE:To manufacture a piezoelectric film of superior piezoelectric resistance to heat with slight lowered piezoelectricity when heat history is received by rolling a polyvinylidene fluoride family film at the given rolling temperature and then poling. CONSTITUTION:A polyvinylidene fluoride family film is a film composed of polyvinylidene fluoride family polymer. Said film is rolled by using a pressure roll, and the film temperature at the time of rolling is in the range of 100 - 140 deg.C. When the rolling temperature is lower than 100 deg.C, type I crystal lamella size gets smaller to lower the piezoelectric resistance to heat, while beyond 140 deg.C, the transition to type I crystals is not completed to remain type II crystals not to form large spontaneous polarization. A rolled film thus manufactured is poled to manufacture a piezoelectric film. As the film is rolled in the temperature range of 100 - 140 deg.C in said piezoelectric film manufacturing process, perfect crystal transition from type II crystals to type I crystals is generated, and as the rolling is performed under the high temperature, the crystal lamella is grown large to enhance piezoelectric resistance to heat to a large extent.
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公开(公告)号：JPS62106910A
公开(公告)日：1987-05-18
申请号：JP24687285
申请日：1985-11-01
Applicant: AGENCY IND SCIENCE TECHN
Inventor： SHIMIZU HIROSHI , NAKAYAMA KAZUO , KANETSUNA HISAAKI
IPC: C08J5/18 , B29C55/04 , B29K27/18 , B29L7/00 , C08F16/14 , C08F214/26 , C08F216/14
Abstract: PURPOSE:To obtain an ultraviolet-transmitting film excellent in heat resistance and chemical resistance and extremely excellent in transparency, by using a specified copolymer characterized by specified optical factors. CONSTITUTION:A uniaxially oriented ultraviolet-transmitting film comprising a tetrafluoroethylene/perfluoroalkyl vinyl ether copolymer (preferably, one having a molar ratio of tetrafluoroethylene units to perfluoroalkyl vinyl ether units in the range of 90:10-97:3) and having a transmittance (at a thickness of 500mu in an ultraviolet wavelength region of 300nm) >=73%. This film can be obtained by uniaxially orienting an unoriented film of said copolymer at a draw ratio >=4 and a temperature higher than the temperature which is the singular point in the temperature characteristic of a yield stress as measured by a tension test. This film is extremely excellent in transparency and excellent in heat resistance and chemical resistance and can be suitably used for, e.g., ultraviolet-transmitting reaction cells and spectrometric cells which require chemical resistance.
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