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公开(公告)号：US5900491A
公开(公告)日：1999-05-04
申请号：US934638
申请日：1997-09-22
IPC分类号： C07D319/12 , C07D319/06
CPC分类号： C07D319/12
摘要： A process for preparing a cyclic ester by reacting an .alpha.-hydroxycarboxylic acid or an .alpha.-hydroxycarboxyliclic acid ester with an orthoester. A process for purifying a cyclic ester by containing water and acid as impurities by adding an orthoester to a cyclic ester obtained by reaction of a reaction mixture including an .alpha.-hydrocarboxylic acid or an .alpha.-hydroxycarboxyliclic acid ester. According to the present invention, a high-purity cyclic ester containing small amounts of impurities such as water and an acid component can be provided.
摘要翻译： 通过使α-羟基羧酸或α-羟基羧酸酯与原酸酯反应制备环酯的方法。 通过向通过包含α-羟基羧酸或α-羟基羧酸酯的反应混合物反应获得的环状酯中加入原酸酯，通过将水和酸作为杂质来含有水和酸来纯化环状酯的方法。 根据本发明，可以提供含有少量杂质如水和酸成分的高纯度环状酯。
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公开(公告)号：US5980790A
公开(公告)日：1999-11-09
申请号：US27970
申请日：1998-02-23
IPC分类号： C08F2/06 , C08F212/08 , C08F220/14 , B29C47/76
CPC分类号： C08F220/14 , C08F212/08
摘要： A high quality copolymer of styrene and methyl methacrylate is economically produced by polymerizing styrene and methyl methacrylate in a homogeneous solution of raw materials comprising methyl methacrylate, styrene, and an antioxidant, while the solution of raw materials is continuously supplied to a polymerization reactor including at least one complete-mixing type reaction tank, continuously removing the polymerization product from the polymerization reactor, supplying the polymerization product removed from the polymerization reactor directly to an extruder having a plurality of vents, and extruding a copolymer from the extruder, while volatile matter are removed through the plurality of vents.
摘要翻译： 苯乙烯和甲基丙烯酸甲酯的高品质共聚物通过在包含甲基丙烯酸甲酯，苯乙烯和抗氧化剂的原料的均匀溶液中聚合苯乙烯和甲基丙烯酸甲酯而经济地制备，同时将原料溶液连续供给到包括 至少一个完全混合型反应槽，从聚合反应器中连续除去聚合产物，将从聚合反应器中除去的聚合产物直接供给到具有多个通风口的挤出机中，并从挤出机挤出共聚物，而挥发物为 通过多个通风口去除。
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公开(公告)号：US5804676A
公开(公告)日：1998-09-08
申请号：US704270
申请日：1996-08-28
CPC分类号： B01J19/1862 , C08F20/14 , B01J2219/00094 , B01J2219/00101 , B01J2219/00103 , B01J2219/00159 , B01J2219/00162 , B01J2219/00164
摘要： A process for continuously preparing a high quality methacrylic polymer with a high productivity is provided. The process comprises continuously polymerizing methyl methacrylate alone or a monomer mixture of methyl methacrylate and an alkyl acrylate by a solution polymerization using methanol as a solvent, directly feeding the resulting polymerization reaction product to an extruder having a plurality of vents, and extruding the polymer, while volatiles are removed through the vents.
摘要翻译： 提供了一种以高生产率连续制备高品质甲基丙烯酸聚合物的方法。 该方法包括通过使用甲醇作为溶剂的溶液聚合连续聚合甲基丙烯酸甲酯单独或甲基丙烯酸甲酯和丙烯酸烷基酯的单体混合物，将所得聚合反应产物直接进料到具有多个通气口的挤出机中，并挤出聚合物， 而挥发物通过通风口排出。
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公开(公告)号：US5719242A
公开(公告)日：1998-02-17
申请号：US757317
申请日：1996-11-27
CPC分类号： C08F20/14
摘要： A process is provided for preparing a high-quality methyl methacrylate polymer by polymerizing a monomer comprising methyl methacrylate as a main component in the presence of a radical polymerization initiator, a chain transfer agent, and 5 to less than 10 wt. % methanol. The polymerization is carried out in a uniform solution. According to this process, a methyl methacrylate polymer is obtained which reduces the generation of silver streaks, voids, coloring, odor and the like at the time of thermal molding.
摘要翻译： 提供了一种制备高质量甲基丙烯酸甲酯聚合物的方法，该方法是在自由基聚合引发剂，链转移剂和5至小于10重量％的存在下，聚合包含甲基丙烯酸甲酯作为主要成分的单体。 ％甲醇。 聚合在均匀的溶液中进行。 根据该方法，得到甲基丙烯酸甲酯聚合物，其在热成型时减少了银条纹，空隙，着色，气味等的产生。
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公开(公告)号：US5708133A
公开(公告)日：1998-01-13
申请号：US642797
申请日：1996-05-03
CPC分类号： C08F6/10
摘要： A process for purifying a polymer by separating and removing volatile components from a polymer composition containing the volatile components, which comprises: (a) heating the polymer composition containing a methanol solvent to a temperature of 120.degree. to 240.degree. C. by a heater, wherein an internal pressure the heater is maintained at 8 to 35 kg/cm.sup.2 G; (b) discharging the heated polymer composition into a tank in which pressure is maintained at -0.7 to 1.0 kg/cm.sup.2 G, and then separating and collecting most of the volatile components to lower the concentration of the solvent in the remaining volatile components in the polymer composition to 0.5% by weight or less; and (c) feeding the resultant polymer composition to a vent extruder maintained such that a barrel temperature at an inner side thereof is 160.degree. to 280.degree. C. and pressure in a vent portion is 5 to 400 Torr, and then extruding the polymer composition to lower the content of the remaining volatile components in the composition to 1% by weight or less. Alternatively, between the above-mentioned steps (b) and (c), there can be interposed a step (b') of introducing an inert gas into the polymer composition before heating or during heating, or in the vicinity of the polymer composition which is being discharged into the tank. By using this process, a polymer can easily be separated and purified, so that a high-quality polymer, particularly a methyl methacrylate polymer, can be efficiently manufactured, without polymer discoloration.
摘要翻译： 一种通过从含有挥发性组分的聚合物组合物中分离除去挥发性成分来纯化聚合物的方法，其包括：（a）通过加热器将含有甲醇溶剂的聚合物组合物加热至120℃至240℃的温度， 其中所述加热器的内部压力保持在8至35kg / cm2G; （b）将加热的聚合物组合物排放到压力保持在-0.7至1.0kg / cm2G的罐中，然后分离和收集大部分挥发性组分以降低聚合物中其余挥发性组分中溶剂的浓度 组成为0.5重量％以下; 和（c）将得到的聚合物组合物供给到保持其内侧的机筒温度为160℃至280℃的排气挤出机，并且排气部分中的压力为5至400托，然后挤出聚合物组合物 将组合物中剩余挥发性成分的含量降低至1重量％以下。 或者，在上述步骤（b）和（c）之间，可以插入在加热或加热之前或在聚合物组合物附近向聚合物组合物中引入惰性气体的步骤（b'） 正在排入坦克。 通过使用该方法，可以容易地分离和纯化聚合物，从而可以有效地制造高质量聚合物，特别是甲基丙烯酸甲酯聚合物，而不会发生聚合物变色。
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公开(公告)号：US5599888A
公开(公告)日：1997-02-04
申请号：US324270
申请日：1994-10-17
CPC分类号： C08F20/14
摘要： A process is provided for preparing a high-quality methyl methacrylate polymer by polymerizing a monomer comprising methyl methacrylate as a main component in the presence of a radical polymerization initiator, a chain transfer agent, and a small amount of methanol as a solvent. The polymerization is carried out in a uniform solution at a temperature of 90.degree. to 180.degree. C. so that a monomer conversion of 40 to 90 mol % is attained. According to this process, a methyl methacrylate polymer is obtained which reduces the generation of silver streaks, voids, coloring, odor and the like at the time of thermal molding.
摘要翻译： 提供了一种通过在自由基聚合引发剂，链转移剂和少量甲醇作为溶剂的存在下聚合包含甲基丙烯酸甲酯作为主要成分的单体来制备高质量甲基丙烯酸甲酯聚合物的方法。 聚合在90〜180℃的均匀溶液中进行，得到40〜90摩尔％的单体转化率。 根据该方法，得到甲基丙烯酸甲酯聚合物，其在热成型时减少了银条纹，空隙，着色，气味等的产生。
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7.发明授权公开(公告)号：US07893458B2
公开(公告)日：2011-02-22
申请号：US11892819
申请日：2007-08-28
申请人： Shigeki Takahashi , Takashi Nakano , Nozomu Akagi , Yasushi Higuchi , Tetsuo Fujii , Yoshiyuki Hattori , Makoto Kuwahara , Kyoko Okada
发明人： Shigeki Takahashi , Takashi Nakano , Nozomu Akagi , Yasushi Higuchi , Tetsuo Fujii , Yoshiyuki Hattori , Makoto Kuwahara , Kyoko Okada
CPC分类号： H01L27/0727 , H01L29/0696 , H01L29/0878 , H01L29/42356 , H01L29/42368 , H01L29/4238 , H01L29/7817 , H01L29/7821
摘要： A semiconductor device includes: a semiconductor substrate; a lateral MOS transistor disposed in the substrate; a Zener diode disposed in the substrate; and a capacitor disposed in the substrate. The transistor includes a drain and a gate, and the diode and the capacitor are coupled in series between the drain and the gate. This device has minimized dimensions and high switching speed. Further, both of a switching loss and a surge voltage are improved.
摘要翻译： 半导体器件包括：半导体衬底; 设置在基板中的横向MOS晶体管; 设置在基板中的齐纳二极管; 以及设置在基板中的电容器。 晶体管包括漏极和栅极，并且二极管和电容器串联耦合在漏极和栅极之间。 该设备具有最小的尺寸和高切换速度。 此外，改善了开关损耗和浪涌电压两者。
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公开(公告)号：US5036019A
公开(公告)日：1991-07-30
申请号：US537688
申请日：1990-06-13
申请人： Hiroyuki Yamane , Yasushi Higuchi
发明人： Hiroyuki Yamane , Yasushi Higuchi
IPC分类号： H01L29/78 , H01L21/266 , H01L21/336 , H01L21/8238 , H01L27/092
CPC分类号： H01L21/823814 , H01L21/266 , H01L21/823828 , H01L27/0928
摘要： A method of producing a MIS transistor such as a MOS transistor has a P type and an N type channel transistors. P type and N type well regions are provided with the N type and the P type channel transistors, respectively. Both the P type and the N type well regions are covered with an insulating film on which gate electrodes are formed in a predetermined pattern by means of a photo-resist. This photo-resist is used as a channelling block layer when an N type impurity is implanted into the P type well region near the gate electrode so as to form an N type diffusion layer. As a result, the photo-resist prevents the N type impurity from channelling into the gate electrode so that a leak current does not occur within the P type well region of the N type channel transistor.
摘要翻译： MOS晶体管等MIS晶体管的制造方法具有P型和N型沟道晶体管。 P型和N型阱区分别设置有N型和P型沟道晶体管。 P型和N型阱区均用绝缘膜覆盖，其上通过光刻胶以预定图案形成栅电极。 当将N型杂质注入到栅极附近的P型阱区中时，该光刻胶用作沟道阻挡层，以形成N型扩散层。 结果，光刻胶防止了N型杂质向栅电极的沟通，使得在N型沟道晶体管的P型阱区内不会发生漏电流。
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9.发明授权Process for production of aromatic polyethers with alkali metal carbonate/bicarbonate/fluoride cocatalyst 失效用碱金属碳酸盐/碳酸氢盐/氟化物助催化剂生产芳香族聚醚的方法
公开(公告)号：US4952665A
公开(公告)日：1990-08-28
申请号：US234793
申请日：1988-08-22
申请人： Shuji Ebata , Yasushi Higuchi
发明人： Shuji Ebata , Yasushi Higuchi
CPC分类号： C08G65/4093 , C08G65/38 , C08L81/06
摘要： An improved process for producing aromatic polyethers by condensation polymerizing aromatic dihydroxy compounds represented by the general formula: HO--Ar--OH and aromatic dichloro compounds represented by the general formula: Cl--Ar.sup.1 --Y--Ar.sup.2 --Cl, or condensation polymerizing monohydroxymonochloro aromatic compounds represented by the general formula: HO--Ar.sup.1 --Y--Ar.sup.2 --Cl (in the above formulae, Ar, Ar.sup.1, Ar.sup.2 are as defined in the specification) in the presence of alkali metal compounds comprising a combination of alkali metal carbonates comprising carbonate and/or hydrogencarbonate of an alkali metal, e.g., potassium, and alkali metal fluorides.In accordance with the present process, high molecular weight aromatic polyethers can be efficiently produced from aromatic chloro compounds which are inexpensive and easily available.
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公开(公告)号：US4754086A
公开(公告)日：1988-06-28
申请号：US882196
申请日：1986-07-03
申请人： Yasushi Higuchi , Toshihiro Suzuki
发明人： Yasushi Higuchi , Toshihiro Suzuki
摘要： A nuclear halide of a monoalkylbenzene is prepared by halogenating a monoalkylbenzene in the presence of an L-type zeolite catalyst.
摘要翻译： 通过在L型沸石催化剂的存在下卤化单烷基苯来制备单烷基苯的核卤化物。
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