Abstract: The purpose of the present invention is to solve the problem, in powder hair dye compositions that contain a percarbonate, that a change occurs in the dyed color tone before and after storage when the composition contains metaaminophenol, 5-aminoorthocresol, resorcin, or a salt thereof, as an oxidation dye. To solve the aforementioned problem, a powder hair dye composition containing (A) a percarbonate, (B) a starch, and (C) an oxidation dye is provided, characterized in that the composition contains at least 7 mass % starch (B) and in that the oxidation dye (C) contains at least one selected from metaaminophenol, 5-aminoorthocresol, resorcin, and salts thereof. Thus, a powder hair dye composition can be obtained which suppresses change in the dye color tone before and after storage and which has excellent storage stability.

Abstract: The purpose of the present invention is to solve the problem, in powder hair dye compositions that contain a percarbonate, that a change occurs in the dyed color tone before and after storage when the composition contains metaaminophenol, 5-aminoorthocresol, resorcin, or a salt thereof, as an oxidation dye. To solve the aforementioned problem, a powder hair dye composition containing (A) a percarbonate, (B) a starch, and (C) an oxidation dye is provided, characterized in that the composition contains at least 7 mass % starch (B) and in that the oxidation dye (C) contains at least one selected from metaaminophenol, 5-aminoorthocresol, resorcin, and salts thereof. Thus, a powder hair dye composition can be obtained which suppresses change in the dye color tone before and after storage and which has excellent storage stability.

Abstract: The purpose of the present invention is, in powder hair dye compositions that contain a percarbonate, to suppress deterioration of coatability in long-term storage and also to ameliorate hair stiffening after hair dyeing treatment. To solve the aforementioned problem, a powder hair dye composition containing (A) a percarbonate and (B) a water-soluble polymer compound is provided, characterized by containing, as the water-soluble polymer compound (B), microorganism-derived/produced mucilage or chitosan containing (b1) glucose as a constitutive sugar, and (b2) a starch. With this powder hair dye composition, it is possible to suppress reduction in coatability in long-term storage under high-temperature, high-humidity conditions, and also to ameliorate hair stiffness after hair dyeing treatment.

Abstract: There is disclosed a polygon mirror motor in which an annular projection is formed on an upper surface of a rotor support member supporting a polygon mirror, and the annular projection supports a part of a lower surface of the polygon mirror. Radial bearings supporting a shaft of the motor have a plurality of oil grooves extending over about a half of the dimension of the radial bearing in a thrust direction. A magnetic fluid is filled in a space defined by the shaft, a support tube of a bearing support member and the radial bearings.

Abstract: A sliding bearing an an end ring are mounted on a housing. A magnetic fluid sealing member comprises a permanent magnet and a magnetic fluid. A space is formed between the magnetic fluid sealing member and a lubricating fluid. A shaft has projection member or the end ring forms a spiral groove on an inner peripheral portion. The projection member of the shaft or the spiral groove of the end ring is disposed in an opposite position of the magnetic fluid sealing member. A magnetic fluid flow is disturbed by the projection member of the shaft or the spiral groove of the end ring according to a rotation of the shaft, then a magnetic fluid film is destructed instantaneously and the pressure at the space lowers. Air in the space is discharged from the housing. The scatter degree of the magnetic fluid is made slightly.

Abstract: A rotor of a permanent magnet type synchronous motor facing a stator having a number of slots comprises a rotor core fixed to a motor shaft and an even number of permanent magnets in a circumferential direction of the rotor core. Projecting portions are formed in the shape of a protruding portion of the rotor core over each permanent magnet. The width (A) of each projecting portion is different from the pitch (B) of the slots of the stator. A position detector for detecting the permanent magnet position of the rotor comprises detectors of the normal rotation and other detectors of the reverse rotation. These detectors are arranged having predetermined phase differences (.alpha., .beta.) to a center line. A pattern generating circuit is provided for switching the conducting position to the stator winding corresponding to the phase differences.

Abstract: A friction material made of a molded cork, a friction surface of which is covered with a liquid or semi-solid lubricant layer including a solid lubricant layer comprising a solid lubricant having a larger particle size and a solid lubricant having a smaller particle size and filling vacant spaces between the larger-sized solid lubricant in dense form, affords a long service life when used in a power controlling apparatus which can transmit power and/or change rotation speed by applying friction and using a friction material.