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1.发明授权
公开(公告)号：US5095049A
公开(公告)日：1992-03-10
申请号：US153674
申请日：1988-02-08
申请人： Kenji Maeda , Toshikazu Umemura , Yuki Ohtani , Takeaki Megumi
发明人： Kenji Maeda , Toshikazu Umemura , Yuki Ohtani , Takeaki Megumi
CPC分类号： G02B1/04 , C08F6/06 , C08G65/46 , C08G85/002
摘要： A process for producing a low-particle-content transparent thermoplastic resin solution, which comprises centrifuging a solution of a transparent thermoplastic resin containing free water to separate it into a resin solution phase, an aqueous phase and an intermediate layer, and separating the resin solution phase from the aqueous phase and the intermediate layer. By this process, the number of particles having a size of at least 0.5 .mu.m in the resin solution can be decreased to 10,000 or less, preferably substantially zero, per gram of the transparent thermoplastic resin.
摘要翻译： 一种生产低颗粒含量的透明热塑性树脂溶液的方法，其包括将含有游离水的透明热塑性树脂的溶液离心分离成树脂溶液相，水相和中间层，并分离树脂溶液 相从水相和中间层。 通过该方法，树脂溶液中的粒径至少为0.5μm的粒子的数量可以降低至每克透明热塑性树脂10,000或更低，优选基本为零。
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2.发明授权Preparing polycarbonate oligomers by reacting phosgene with an aqueous solution containing a salt of a dihydric phenol in an organic solvent which comprises previously cooling the aqueous solution and carrying out the reaction at a low temperature 失效通过使光气与含有二元酚盐的水溶液在有机溶剂中反应来制备聚碳酸酯低聚物，其包括预先冷却该水溶液并在低温下进行反应
公开(公告)号：US4255557A
公开(公告)日：1981-03-10
申请号：US81616
申请日：1979-10-03
申请人： Takeaki Megumi , Hiroyuki Yoshizaki , Sigeo Kondoh
发明人： Takeaki Megumi , Hiroyuki Yoshizaki , Sigeo Kondoh
摘要： A process for preparing polycarbonate oligomers by reacting phosgene with an alkaline aqueous solution containing an alkali metal salt or alkaline earth metal salt of a dihydric phenol in the presence of an inert organic solvent, which comprises previously cooling said alkaline aqueous solution to not higher than 0.degree. C., reacting the cooled aqueous solution with phosgene to perform a phosgenation reaction and also to absorb the heat of the phosgenation reaction by the quantity of heat that said cooled aqueous solution has, thereby to adjust the phosgenation reaction system substantially to not higher than 10.degree. C., and then oligomerizing the phosgenation product at a temperature of 15.degree. C. or higher.
摘要翻译： 通过使光气与含有二元酚的碱金属盐或碱土金属盐的碱性水溶液在惰性有机溶剂的存在下反应来制备聚碳酸酯低聚物的方法，其包括预先将所述碱性水溶液冷却至不高于0 将冷却的水溶液与光气反应以进行光气化反应，并且通过所述冷却水溶液具有的热量吸收光气化反应的热量，从而将光气化反应体系基本上调至不高于 10℃，然后在15℃或更高的温度下使光气化产物低聚。
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公开(公告)号：US4122112A
公开(公告)日：1978-10-24
申请号：US804169
申请日：1977-06-06
摘要： A process for producing polycarbonate oligomers by the reaction of dihydroxy compounds with phosgene, which comprises contacting a mixture of a dihydroxy compound and an aqueous alkali solution with phosgene in the presence of an organic solvent in a tubular reactor to perform a first-stage reaction, introducing the first-stage reaction mixture into a tank-type reactor equipped with a stirrer and containing the aqueous alkali solution and a solution in the organic solvent of a polycarbonate oligomer formed by the reaction of the first-stage reaction product in a second stage, and performing the second-stage reaction while stirring the reaction mixture in the tank-type reactor and maintaining it at a predetermined temperature by sufficient removal of the heat of reaction.
摘要翻译： 通过二羟基化合物与光气的反应制备聚碳酸酯低聚物的方法，该方法包括在有机溶剂存在下，将二羟基化合物和碱水溶液与光气的混合物在管式反应器中进行第一阶段反应， 将第一阶段反应混合物引入装有搅拌器并含有碱水溶液的罐式反应器中，并在第二阶段通过第一阶段反应产物的反应形成的聚碳酸酯低聚物的有机溶剂中的溶液， 并在搅拌槽式反应器中的反应混合物的同时进行第二阶段反应，并通过充分除去反应热将其保持在预定温度。
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公开(公告)号：US4097457A
公开(公告)日：1978-06-27
申请号：US637307
申请日：1975-12-03
申请人： Takeaki Megumi , Shigeo Kondo
发明人： Takeaki Megumi , Shigeo Kondo
CPC分类号： C08G64/14
摘要： High molecular weight polycarbonates are prepared by the reaction of phosgene with a dihydroxydiaryl alkane in the presence of an acid acceptor, a solvent and at least one member selected from specified monohydric alcohols, haloformates, monothiols, halothioformates, monocarboxylic acids and halides, salts, quaternary ammonium salts and anhydrides thereof.
摘要翻译： 高分子量聚碳酸酯通过光气与二羟基二芳基烷烃在酸受体，溶剂和至少一种选自特定的一元醇，卤代甲酸酯，一硫醇，卤代硫酸酯，一元羧酸和卤化物，盐，四 铵盐和酸酐。
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