Abstract:
PROBLEM TO BE SOLVED: To provide a process for continuously producing polycarbonate from oligocarbonate by transesterification using a specific reactor.SOLUTION: In the method for producing polycarbonate from oligocarbonate, the polycondensation is conducted at a high specific surface area and at a high film formation rate, a reactor including a perforated disk is used, and polycarbonate is obtained by transesterification in the presence of the catalysts of diaryl carbonate and diphenol.
Abstract:
PROBLEM TO BE SOLVED: To provide an improved process for production of a water absorptive or water-insoluble polymer. SOLUTION: The process for production of a water absorptive or water-insoluble polymer by continuous polymerization of a monomer in a reaction vessel system containing at least three zones is characterized in a first zone continuously supplying a monomer, an initiator and water under a condition to start polymerization of the monomer, a second zone of a gel phase zone and a third zone of a granulation zone wherein the reaction vessel system has at least two rotatory axes in the second and the third zones at highest temperatures of 50-100°C and at least a part of supplied water to the first zone is voluntarily in vapor form. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide an extrusion line, which has a pond part in a vacuum chamber and an atmospheric pond part and can feed an extrudate from the former as close as possible to a bottom of the latter by lengthening the former effectively. SOLUTION: The extrusion line of present invention comprises a vacuum chamber (29) and an atmospheric pond part (78) prepared downstream of it. A pond member (72) neighboring the atmospheric pond part (78) is prepared inside the vacuum chamber (29). The extrusion line further comprises a hood (75) extending from the vacuum chamber (29) into the atmospheric pond part (78) and an orifice (74) inside the hood (75), which connects the pond part (72) and the atmospheric pond part (78). COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a batchwise polyester polymerizer applicable to a batchwise polyester polymerization method, and capable of shortening polycondensation reaction time and improving the productivity. SOLUTION: The batchwise polyester polymerizer which may be the normal one having a polycondensation reaction vessel 4 joined to a vacuum connection line 5, a reaction liquid-circulating pump 3 and a reaction liquid-circulating line 2, also has a thin film column 1 which has two or more inclined plates 1c fixed to the inner wall at a prescribed angle, of which the inlet 1b side is joined to one terminal of the reaction liquid-circulating line 2, and of which the outlet 1a side is joined to the upper part of the polycondensation reaction vessel 4. COPYRIGHT: (C)2004,JPO
Abstract:
PURPOSE:To minimize the radiation loss of formed plasma, by arranging a shield member between a titanium vapor generating part and the inner wall of a vacuum container. CONSTITUTION:A shield member 4 is arranged between the leading end 3a of a titanium evaporation apparatus 3 and a space for generating plasma P. The titanium vapor generated from the leading end 3a of the titanium evaporation apparatus 3 is adhered to the surface of the shield member 4 in the side of the titanium evaporation apparatus 3 and a part of the inner wall surface of a vacuum container 1 not contacted with plasma P and the vacuum container 1 is evacuated to a high vacuum degree by the adsorbing action of the adhered titanium. At this time, because titanium adhered to the shield member 4 and a part of the inner wall of the container 1 is not contacted with plasma P, no mutual action is generated and the mixing of titanium in plasma P is minimized to minimize the radiation loss of the formed plasma P.
Abstract:
PURPOSE:To increase the cooling rate after the heat treatment of a material to be heat-treated and to enable control of cooling rate with a simple device by forming a space in a furnace shell part and a gas circulating system communicating respectively with the upper and lower parts of the space for housing the material to be heat-treated. CONSTITUTION:An all case type batch operated vacuum heat treating furnace consists of a hermetically constructed furnace shell 2 and refractories 7 lined on the inside of the shell 2 by having a space 5 from the shell 2. The respective upper and lower parts of the shell space 5 provided between said shell 2 and the refractories 7 and the space for housing a material 10 to be heat treated enclosed with the refractories 7 are communicated by communicating holes 12 to constitute a gas circulating system by the difference in gas density arising from a temp. difference between the respective space parts.