摘要:
Processes for producing an aromatic/aliphatic copolycarbonate which has excellent impact resistance, excellent heat resistance, a high Abbe's number, a low photoelastic coefficient, and an excellent color tone. The processes include those in which: an aromatic/aliphatic copolycarbonate having a nitrogen content of 9 ppm or lower is produced from an aliphatic dihydroxy compound having a nitrogen content of 10 ppm or lower; an aromatic/aliphatic copolycarbonate is produced from an aliphatic dihydroxy compound having an iron content of 1 ppm or lower; an aromatic/aliphatic copolycarbonate is produced from an aliphatic dihydroxy compound having a content of aldehyde groups and/or formyl groups of 100 ppm or lower; an aromatic/aliphatic copolycarbonate is produced by subjecting an aromatic dihydroxy compound and an aliphatic dihydroxy compound having a content of free chlorine of 5 ppm or lower to polycondensation with heating and melting; and an aromatic/aliphatic copolycarbonate is produced from an aliphatic dihydroxy compound which has a melt Hazen unit of 40 or smaller after having been maintained at 260° C. for 5 hours in the air.
摘要:
Aldehyde compounds contained in polycyclic diols as impurities are effectively removed by distilling the polycyclic diols in the presence of an alkali metal compound and/or a alkaline earth compound. The distilled polycyclic diols are useful as a diol component of a polymer such as polycarbonate with less yellowing.
摘要:
A process for producing a cellulose ester film that is produced by a melt casting method using no solvent at film formation, and that attains reduction of bright spot foreign matter, excelling in planarity, and that attains reduction of staining, excelling in dimensional stability. It is also intended to provide such a cellulose ester film, a polarizing plate and a liquid crystal display unit. There is provided a process for producing a cellulose ester film, characterized by forming into a film a material containing a cellulose ester and an ester compound of 1 to 7.5 distribution coefficient obtained by condensation of a polyhydric alcohol and an organic acid of the general formula: (1) according to a melt casting method.
摘要:
Embodiments of the invention provide optimum servo patterns for perpendicular magnetic recording method. In one embodiment, a burst field of servo patterns is composed of burst-signal parts in each of which a constant frequency occurs successively and zero-signal parts each of which has been demagnetized to a state of zero-magnetization, and the total magnetization of the burst field is made approximately 0. The zero signal portions are formed by shutting off a write current at a time during an operation to record servo patterns on a disk initialized to a state of zero-magnetization. The total magnetization of all servo patterns is made approximately 0 by encoding an address mark field and a track code field of servo patterns by a phase shift method.
摘要:
An object of the present invention is to provide a battery box which can prevent a dry battery from being inserted in the battery box in an erroneous mode and thus avoid a short-circuit condition of the dry battery. To prevent a lateral face of the dry battery to be inserted in the battery box from coming into contact with an electrode terminal, a contact preventing member which functions as a stopper is provided above at least one of a positive electrode terminal or a negative electrode terminal. In case that the contact preventing member protrudes upwardly over the battery box, a lid of the battery box is provided with a through hole, so as to avoid an interference of the contact preventing member with the lid when the lid is closed. Also, it is possible to design the lid without any through holes, by forming the contact preventing member as a protrusion.
摘要:
An optical cellulose ester film comprising a cellulose ester (A); at least one ester based plasticizer (B) selected from ester based plasticizers composed of a polyhydric alcohol and a univalent carboxylic acid, or ester based plasticizers composed of a polyvalent carboxylic acid and a monohydric alcohol; at least one stabilizer (C) selected from the group consisting of a phenol based stabilizer, a hindered amine based stabilizer, or a phosphorous based stabilizer; and a hydrogen bonding solvent (D).
摘要:
In an image forming device, a paper feed cassette accommodating a plurality of papers is removably inserted in a cassette accommodating portion of a device main body. A locking member and a lock releasing member maintain a flapper at a prescribed pressed-down position. When the paper feed cassette is inserted into the cassette accommodating portion, after the flapper at the prescribed pressed-down position is unlocked, the flapper is temporarily caught at a position within a vertical swinging range of the flapper. After the paper feed cassette is completely inserted, the flapper is released.
摘要:
An image forming device includes a photoconductive drum, a motor which rotates the photoconductive drum, a charging unit which charges a surface of the photoconductive drum, an exposing unit which writes image information as an electrostatic latent image onto the charged surface of the photoconductive drum, a developing unit which develops the electrostatic latent image, a transfer unit which transfers the developed image onto a paper, a paper dust removing unit which removes paper dusts by contacting against the surface of the paper dust removing unit, and a rotation mechanism which intermittently rotates the paper dust removing unit.
摘要:
A method for evaluating a residual fatigue life of mechanical parts, consisting of the steps of grinding a surface layer of a mechanical part to be inspected by a minute amount to form an inspection surface, measuring half-width data of an X-ray diffraction intensity curve on the inspection surface, calculating a depth (do) of a fatigue damaged region from a graph of a half-width ratio (H/Ho) versus a depth (d) below the surface layer, and determining a fraction of fatigue life N/Nf on the basis of data of the depth (do) of the defective region versus the fraction of fatigue life N/Nf which were separately obtained from a test piece.