Patent application number | Description | Published |
20120064314 | MULTILAYER ZnO SINGLE CRYSTAL SCINTILLATOR AND METHOD FOR MANFACTURING THE SAME - Provided are a multilayer ZnO single crystal scintillator wherein the light emitting quantity is increased, and a method for manufacturing such scintillator. A multilayer body composed of ZnO semiconductor layers having different band gaps is manufactured, and a layer having a small band gap is made to have a thickness that permits ionization radiation, such as α rays and electronic rays, to enter the layer, thereby the light emitting quantity of the multilayer ZnO single crystal scintillator is greatly increased. | 03-15-2012 |
20130317182 | PROCESS FOR MANUFACTURING BRANCHED AROMATIC POLYCARBONATE RESIN WITH DESIRED DEGREE OF BRANCHING - [Problem] To provide a process for manufacturing, easily and using a conventional branching agent, a branched aromatic polycarbonate resin which has both a sufficiently high molecular weight and a desired degree of branching. [Solution] A branched aromatic polycarbonate resin having a degree of branching (N value) controlled within a specific range is manufactured by subjecting an aromatic polycarbonate prepolymer that has a branched structure introduced using a specific amount of a branching agent to molecular-weight-increasing linking reaction with an aliphatic diol compound in the presence of a transesterification catalyst under the condition of a reduced pressure. The amount (A) of the branching agent used in adjusted on the basis of the correlation between the amount (A) of the branching agent used and the N value of the branched aromatic polycarbonate resin. | 11-28-2013 |
20140371404 | METHOD FOR CONTINUOUS PRODUCTION OF HIGH-MOLECULAR-WEIGHT POLYCARBONATE RESIN - The present invention provides an improved method for continuously producing a high-molecular-weight polycarbonate resin by carrying out a linking and highly-polymerizing reaction of an aromatic polycarbonate prepolymer with an aliphatic diol compound wherein the retention time of the reaction mixture in the linking and highly-polymerizing reactor is shortened to achieve excellent performance. | 12-18-2014 |
20150133611 | METHOD FOR CONTINUOUS PRODUCTION OF HIGH MOLECULAR WEIGHT POLYCARBONATE RESIN - A high molecular weight polycarbonate resin is continuously produced by subjecting an aromatic polycarbonate prepolymer and an aliphatic diol compound to a linking and highly polymerizing reaction. Even an aliphatic diol compound having a comparatively low boiling point can be allowed to efficiently contribute to the linking and highly polymerizing reaction. An aromatic polycarbonate prepolymer is produced by a polycondensation reaction between an aromatic dihydroxy compound and a diester carbonate, adding an aliphatic diol compound having an aliphatic group bonding to a terminal hydroxyl group to obtain a prepolymer mixture, and subjecting the resulting prepolymer mixture to a linking and highly polymerizing reaction under reduced pressure. The aliphatic diol compound is added at a pressure exceeding 200 torr, and the prepolymer mixture is subjected to a linking and highly polymerizing reaction before the terminal hydroxyl group concentration of the aromatic polycarbonate prepolymer in the prepolymer mixture reaches 2000 ppm. | 05-14-2015 |
20150232613 | METHOD FOR PRODUCING BRANCHED AROMATIC POLYCARBONATE RESIN - The present invention provides a method for producing a branched aromatic polycarbonate resin that is molecular weight-increased, which comprises subjecting an aromatic polycarbonate prepolymer and a linking agent comprising a trifunctional or more of an aliphatic polyol compound to transesterification reaction in the presence of a transesterification catalyst under a reduced pressure condition. | 08-20-2015 |
20150267006 | PROCESS FOR PREPARING HIGHLY POLYMERIZED AROMATIC POLYCARBONATE RESIN - The present invention is to provide a process for preparing a highly polymerized aromatic polycarbonate resin, which comprises the steps of a highly polymerizing step for reacting an aromatic polycarbonate prepolymer and an aliphatic diol compound in the presence of a transesterification catalyst to obtain a highly polymerized aromatic polycarbonate resin, a cyclic carbonate removal step for removing at least part of the cyclic carbonate by-produced in the above highly polymerizing step out of the reaction system, and a recycle step of hydrolyzing the cyclic carbonate removed in the cyclic carbonate removal step to obtain an aliphatic diol compound and using the obtained aliphatic diol compound as at least a part of the aliphatic diol compound to be used in the highly polymerizing step. | 09-24-2015 |
20150284509 | AROMATIC POLYCARBONATE RESIN COMPOSITION - The present invention provides an aromatic polycarbonate resin composition having a high molecular weight and less amount of a heterologous structure, retaining good qualities, and excellent in thermal stability, and an improved preparation process thereof. | 10-08-2015 |
20150322203 | PROCESS FOR PREPARING HIGHLY POLYMERIZED AROMATIC POLYCARBONATE RESIN - The present invention provides a process for preparing a highly polymerized aromatic polycarbonate resin which not only has excellent quality such that it has high molecular weight and high fluidity, but also has more excellent heat resistance. The process of the present invention comprises a highly polymerizing step for reacting an aromatic polycarbonate prepolymer with an aliphatic diol compound of the following formula (I) having hydroxymethyl groups (HO—CH | 11-12-2015 |