摘要:
A polycarbonate resin composition for use in the production of a substrate for an optical information medium, comprising (A) an aromatic polycarbonate resin having a weight average molecular weight of from 13,000 to 18,000, wherein the aromatic polycarbonate resin (A) is produced by subjecting an aromatic dihydroxy compound and a carbonic diester to a transesterification reaction, and is substantially free of a chlorine atom; and (B) a partial ester obtained from a saturated aliphatic carboxylic acid having 10 to 30 carbon atoms and a di- to hexahydric alcohol, wherein the partial ester (B) has an acid value of from 2 to 20 mgKOH.
摘要:
A molded article produced by injection-molding a molten form of a flame-retardant aromatic polycarbonate resin composition comprising: 100 parts by weight of an aromatic polycarbonate (A) (Mw: 17,000 to 35,000), 0.01 to 3 parts by weight of inorganic compound particles (B) (average diameter: 10 nm to 10 μm), 0.001 to 0.5 part by weight of an alkali metal salt (C) of an organic sulfonic acid, and 0.01 to 0.5 part by weight of a fluoropolymer (D), wherein the largest FL/t ratio of the molded article is 50 or more, wherein FL is a flow length of the composition in a mold and t is a thickness of the molded article, the FL/t ratios being obtained by measuring the thicknesses of the molded article at portions corresponding to flow paths (L) (from a gate to points at which the flow of the composition stops) of the composition in the mold during the molding, and calculating an integral of (dL/T′) along each (L) (dL: length of a segment of (L), t′: thickness of the molded article at a portion corresponding to the segment), wherein the calculated integrals are defined as the FL/t ratios.
摘要:
To provide a method for improving a coercive force of epsilon-type iron oxide particles, and an epsilon-type iron oxide. Specifically, to provide a method for improving the coercive force of an epsilon-type iron oxide comprising: substituting Fe-site of the epsilon-type iron oxide with other element, while not substituting Fe of D-site in the epsilon-type iron oxide with other element, and the epsilon type iron oxide.
摘要:
The invention provides an apparatus and process for producing high-purity diol by taking cyclic carbonate and aliphatic monohydric alcohol as starting materials, continuously feeding the starting materials into column A, carrying out reactive distillation in column A, continuously withdrawing a low boiling point reaction mixture containing a produced dialkyl carbonate and the aliphatic monohydric alcohol from an upper portion of column A, continuously withdrawing a high boiling point reaction mixture containing a produced diol from a lower portion of column A, continuously feeding the high boiling point reaction mixture into distillation column C, distilling off material having a lower boiling point than that of the diol contained in the high boiling point reaction mixture AB as a column top component and/or a side cut component so as to obtain a column bottom component, continuously feeding the column bottom component into distillation column E, and obtaining the diol.
摘要:
It is an object of the present invention to provide a specific industrial separation process that enables an alcohol to be separated out efficiently and stably for a prolonged period of time from a large amount of a low boiling point reaction mixture containing a by-produced alcohol when mass-producing aromatic carbonates on an industrial scale by subjecting a dialkyl carbonate and an aromatic monohydroxy compound to transesterification reaction in a reactive distillation column in which a catalyst is present. Although there have been various proposals regarding processes for the production of aromatic carbonates by means of a reactive distillation method, these have all been on a small scale and short operating time laboratory level, and there have been no disclosures whatsoever on a specific process or apparatus enabling mass production on an industrial scale to be carried out stably for a prolonged period of time. Moreover, there have been no disclosures on a specific process or apparatus enabling the alcohol by-produced when producing aromatic carbonates the an industrial scale using a reactive distillation system to be separated out efficiently and stably for a prolonged period of time on an industrial scale of not less than 200 kg/hr. According to the present invention, there is proposed a specific process using a continuous multi-stage distillation column having a specified structure enabling the above object to be attained.
摘要:
It is an object of the present invention to provide, for a case of producing a dialkyl carbonate and a diol from a cyclic carbonate and an aliphatic monohydric alcohol, a process that simultaneously satisfies the cyclic carbonate conversion being high, the selectivities for the dialkyl carbonate and diol to be produced being high, and a high-purity diol having a high UV transmittance and a low aldehyde content being obtained without carrying out complicated treatment such as feeding water into a diol distillation purification step. The present invention discloses a process for the production of the dialkyl carbonate and the diol in which, when producing the dialkyl carbonate and the diol by reacting the cyclic carbonate and the aliphatic monohydric alcohol together in the presence of a catalyst in a transesterification reactor comprising a tray type continuous multi-stage distillation column, reaction conditions (residence times, temperatures) in the distillation column are controlled to be specific conditions.
摘要:
It is an object of the present invention to provide a specific process that enables a dialkyl carbonate and a diol to be produced on an industrial scale of not less than 2 ton/hr and not less than 1.3 ton/hr respectively with high selectivity and high productivity stably for a prolonged period of time through a reactive distillation system of taking a cyclic carbonate and an aliphatic monohydric alcohol as starting materials, continuously feeding the starting materials into a continuous multi-stage distillation column in which a catalyst is present, and carrying out reaction and distillation simultaneously in the column. Although there have been many proposals regarding processes for the production of the dialkyl carbonate and the diol through the reactive distillation method, these have all been on a small scale and short operating time laboratory level, and there have been no disclosures whatsoever on a specific process or apparatus enabling mass production on an industrial scale. According to the present invention, there is provided a specific continuous multi-stage distillation column having a specified structure, and a production process using this continuous multi-stage distillation column, according to which the dialkyl carbonate and the diol can be produced on an industrial scale of not less than 2 ton/hr and not less than 1.3 ton/hr respectively each with a selectivity of not less than 95%, preferably not less than 97%, more preferably not less than 99%, stably for not less than 1000 hours, preferably not less than 3000 hours, more preferably not less than 5000 hours.
摘要:
A method for stably producing an aromatic polycarbonate, which comprises continuously reacting an aromatic dihydroxy compound with a diaryl carbonate in a closed, reactor-pipeline system, the closed, reactor-pipeline system comprising: a plurality of reactors which are liquid-tightly connected through a pipeline toward an outlet for a final aromatic polycarbonate product, the pipeline comprising one or more pipes, wherein the plurality of reactors include at least two reactors connected in series, and at least one filter secured in the pipe or pipes of the reactor-pipeline system, wherein the or each filter is simultaneously or separately taken out to the outside of the reactor-pipeline system and subjected to washing in the outside of the reactor-pipeline system, followed by returning of the resultant washed filter into the inside of the pipe or pipes of the reactor-pipeline system, the washing being performed with the below-mentioned washing agents used in the following order: an aqueous solution of a basic compound, an aromatic monohydroxy compound, and a molten mixture of an aromatic dihydroxy compound and a diaryl carbonate, the molten mixture containing a basic compound.
摘要:
It is an object of the present invention to provide a specific process that enables a high-purity diphenyl carbonate required for producing a high-quality high-performance aromatic polycarbonate to be produced industrially in a large amount (e.g. not less than 1 ton/hr) stably for a prolonged period of time (e.g. not less than 1000 hours, preferably not less than 3000 hours, more preferably not less than 5000 hours) from a cyclic carbonate and a phenol. When producing, from a cyclic carbonate and a phenol, a high-purity diphenyl carbonate required for producing a high-quality high-performance aromatic polycarbonate, the above object can be attained by carrying out a process according to the present invention which comprises steps of: (I) producing a dialkyl carbonate and a diol using a reactive distillation column having a specified structure; (II) producing a diphenyl carbonate using two reactive distillation columns each having a specified structure, and (III) obtaining a high-purity diphenyl carbonate from the diphenyl carbonate using a high boiling point material separating column A and a diphenyl carbonate purifying column B.
摘要:
It is an object of the present invention to provide a specific process that enables a dialkyl carbonate and a diol to be produced on an industrial scale of not less than 2 ton/hr and not less than 1.3 ton/hr respectively with high selectivity and high productivity stably for a prolonged period of time through a reactive distillation system of taking a cyclic carbonate and an aliphatic monohydric alcohol as starting materials, continuously feeding the starting materials into a continuous multi-stage distillation column in which a catalyst is present, and carrying out reaction and distillation simultaneously in the column. Although there have been many proposals regarding processes for the production of the dialkyl carbonate and the diol through the reactive distillation method, these have all been on a small scale and short operating time laboratory level, and there have been no disclosures whatsoever on a specific process or apparatus enabling mass production on an industrial scale. According to the present invention, there is provided a specific continuous multi-stage distillation column having a specified structure, and a production process using this continuous multi-stage distillation column, according to which the dialkyl carbonate and the diol can be produced on an industrial scale of not less than 2 ton/hr and not less than 1.3 ton/hr respectively each with a selectivity of not less than 95%, preferably not less than 97%, more preferably not less than 99%, stably for not less than 1000 hours, preferably not less than 3000 hours, more preferably not less than 5000 hours.