Patent application number | Description | Published |
20080227946 | Thermosetting Composition and Curing Method Thereof - The invention relates to a thermosetting composition comprising (A) a compound having at least one oxetanyl group in the molecule, (B) a compound having at least two carboxyl groups in the molecule, and (C) an imidazolium salt, curing method thereof and products cured thereby. Cured products prepared from the composition of the invention is excellent in electrical isolation, flexibility, adhesiveness and mechanical strength. | 09-18-2008 |
20080285170 | Magnetic disk drive and method of controlling the same - Embodiments of the present invention provide a magnetic disk drive, in which a disturbance component contained in an output signal from a rotational vibration detector, can be appropriately suppressed irrespective of frequency of the component, and a method of controlling the drive. According to one embodiment, in a magnetic disk drive having a rotational vibration detector for detecting rotational vibration of a drive housing, a main control circuit performs a head moving step of driving a voice coil motor to move a magnetic head on a magnetic disk, a frequency estimation step of estimating a frequency of each disturbance component contained in an output signal from the rotational vibration detector after moving the magnetic head, and a suppressor setting step of setting a notch filter for suppressing the disturbance component based on the estimated frequency. | 11-20-2008 |
20090008138 | THERMOSETTING RESIN COMPOSITION AND USES THEREOF - The thermosetting resin composition and the solder resist ink according to the present invention are characterized by comprising: a thermosetting resin (A) comprising (A1) a compound containing an acid anhydride group and/or a carboxyl group and (A2) a compound having a functional group which reacts with (A1) described above and an organic filler (B) containing a phosphorus atom, wherein the organic filler (B) containing a phosphorus atom has an average particle diameter of 50 Êm or less. According to the present invention, capable of being provided at a low cost and a good productivity are an excellent thermosetting resin composition and solder resist ink capable of forming a cured material which achieves an adhesion to a substrate, a low warping property, a flexibility, a plating resistance, a solder heat resistance and a long term reliability as well as a flame retardancy, and a cured material and a protective film which are excellent in the above characteristics. Further, electronic parts having a protective film which is excellent in a flame retardancy and which has a high reliability can be provided. | 01-08-2009 |
20090030217 | PRODUCTION PROCESS OF BIFUNCTIONAL EPOXY MONOMER BY SELECTIVE OXIDATION OF DIOLEFIN COMPOUND - There is provided a novel method for producing a bifunctional epoxy monomer which comprises reacting diolefin with a hydrogen peroxide aqueous solution, in the presence of molybdenum or tungsten oxide as a catalyst to selectively epoxidize a double bound at a specific position. The bifunctional epoxy monomers provided by the present invention are substances widely used in various industrial fields such as chemical industry, as materials for resist materials (particularly solder resist materials), and intermediates of agrochemicals and medicines, and various polymers such as plasticizers, adhesives and coating resins. | 01-29-2009 |
20090030242 | POLYMER OF POLYCARBONATE DIOL HAVING AN ALICYCLIC STRUCTURE AND PRODUCTION PROCESS THEREOF - The invention relates to a polycarbonate diol, comprising an organic residue derived from a diol component represented by formula (1), | 01-29-2009 |
20090054577 | RESIN COMPOSITION - The invention relates to a thermosetting resin composition comprising (A) 20 to 90 mass % of thermosetting resin, (B) 10 to 80 mass % of inorganic and/or organic fine particles and (C) 0.1 to 5 mass % of fluorine-containing polyether, wherein (C) is polymer having fluorinated alkyl polyoxetane structure of formula (1) or (2), | 02-26-2009 |
20090073601 | Magnetic disk drive and control method thereof - Embodiments of the present invention provide a magnetic disk drive capable of easily suppressing degradation of position error caused by disturbance resulting from vibration from the outside. According to one embodiment, the magnetic disk drive acquires, during a period of time of track following control, data necessary for determining a filtering characteristic required to newly be specified in a peak filter; in association with the start of subsequent seek control, determines the filtering characteristic required to be specified in the peak filter; and specifies the determined filtering characteristic in the peak filter. | 03-19-2009 |
20090082518 | CARBOXYL GROUP-CONTAINING POLYURETHANE, HEAT-CURABLE RESIN COMPOSITION AND USES THEREOF - Disclosed is a carboxyl group-containing polyurethane (A) produced from a polyol (b) containing at least 10 mol % (relative to the total (100 mol %) of the polyol (b)) of a polyol (b1) which:
| 03-26-2009 |
20090118422 | CARBOXYL GROUP-CONTAINING POLYURETHANE AND USES THEREOF - Disclosed is a carboxyl group-containing polyurethane containing a structure derived from a polycarbonate diol (B), the polycarbonate diol (B) having: (i) a number-average molecular weight of 500 to 50,000; (ii) an alkylene group of 8 to 18 carbon atoms in its structure; and (iii) hydroxyl groups at both ends. The carboxyl group-containing polyurethane is suitable as materials of cured products that are excellent in adhesion with substrates, low warpage, flexibility, plating resistance, soldering heat resistance and long-term reliability. | 05-07-2009 |
20090133905 | HEAT-CURABLE RESIN COMPOSITION INCLUDING SILICONE POWDER - A heat-curable resin composition has excellent printability, non-tackiness, matte and electrical properties. The heat-curable resin composition includes a heat-curable resin (A) and silicone powder (B). Preferably, the silicone powder (B) is spherical or substantially spherical, and has a specific gravity of 0.95 to 1.5 and a particle diameter of 0.01 to 10 μm. The heat-curable resin (A) preferably includes a carboxyl group-containing polyurethane and a heat-curable component. The carboxyl group-containing polyurethane is obtained by reacting a polyisocyanate compound (a), a polyol compound (b) (other than compound (c)), and a carboxyl group-containing dihydroxy compound (c). | 05-28-2009 |
20090136732 | THERMOSET RESIN COMPOSITION - The present invention provides a thermoset resin composition which contains polycarboxylic acid resin (A) and epoxy resin and/or oxetane resin (B) as essential ingredients and is capable of forming a transparent cured product having improved endurance in hot and humid conditions; an optical film obtained by curing the above-mentioned thermoset resin composition; and a laminated film obtained by applying the above-mentioned thermoset resin composition onto a film substrate and curing it. | 05-28-2009 |
20090156752 | CARBOXYL GROUP-CONTAINING POLYURETHANE AND HEAT-CURABLE POLYURETHANE RESIN COMPOSITION - A carboxyl group-containing polyurethane is capable of giving cured products excellent in adhesion with substrates, low warpage, flexibility, plating resistance, soldering heat resistance and long-term reliability. The carboxyl group-containing polyurethane includes a structure derived from a polyol compound having 1 to 10 hydroxyl groups and 18 to 72 carbon atoms per molecule. The carboxyl group-containing polyurethane is produced by reacting: (A) a polyisocyanate compound; (B) a polyol compound having 1 to 10 hydroxyl groups and 18 to 72 carbon atoms per molecule; and (C) a carboxyl group-containing dihydroxy compound (other than the compound (B)). | 06-18-2009 |
20090171015 | THERMOSETTING RESIN COMPOSITION, THERMOSETTING RESIN COMPOSITION SOLUTION, FILM FORMING MATERIAL AND THEIR CURED PRODUCT - Disclosed is a thermosetting resin composition including; (A) a carboxyl group-containing polyurethane prepared by using (a) a polyisocyanate compound (b) polyol compounds (c) a carboxyl group-containing dihydroxy compound as raw materials, (B) a curing agent, wherein the polyol compounds (b) are one or more kinds of polyol compound(s) selected from Group (I) and one or more kinds of polyol compound(s) selected from Group (II); Group I: polycarbonate polyol, polyether polyol, polyester polyol, and polylactone polyol, Group II: polybutadiene polyol, polysilicone having terminal hydroxyl groups, and such a polyol that has 18 to 72 carbon atoms and oxygen atoms present only in hydroxyl groups. The thermosetting resin composition can give a protection film for flexible printed circuits that has excellent long-term reliability of electric insulation, flexibility, and low warpage from curing shrinkage, and particularly low tackiness. | 07-02-2009 |
20090253915 | NOVEL EPOXY COMPOUNDS AND METHOD FOR PRODUCTION OF THE SAME - Novel epoxy compounds having imide structures represented by general formula (I) or general formula (II) below, and having an allyl group in the same molecule, as well as a process for their production. | 10-08-2009 |
20090290251 | HARD-DISK DRIVE, METHOD OF CONTROLLING THE HARD-DISK DRIVE, AND METHOD OF MANUFACTURING THE HARD-DISK DRIVE - A hard-disk drive. The hard-disk drive includes a magnetic-recording disk having a plurality of tracks formed thereon. The hard-disk drive also includes a magnetic-recording head configured to be positioned over a target track selected from the plurality of tracks and configured to write data to and to read data from the target track. Moreover, the hard-disk drive includes a range-definer configured to define an allowed range of a position error of the magnetic-recording head corresponding to the target track. In addition, the hard-disk drive includes a write-enabler configured to determine whether writing data by the magnetic-recording head is allowed based on the position error of the magnetic-recording head with respect to the target track and the allowed range that is calculated from data read out by the magnetic-recording head. | 11-26-2009 |
20090296265 | HARD-DISK DRIVE - A hard-disk drive (HDD). The HDD includes a main control circuit. The main control circuit includes a frequency-hunting peak filter. The frequency-hunting peak filter includes a peak filter wherein a gain at a center frequency becomes finite and a reciprocal of the transfer function is represented by z/F | 12-03-2009 |
20100142082 | DISK DRIVE AND METHOD FOR HEAD SERVO CONTROL OF THE DISK DRIVE - A disk drive. The disk drive includes a head, a moving mechanism, a first peak filter, an adaptive peak filter, and a filter controller. The head is configured to read servo data on a disk at sampling frequency. The moving mechanism is configured to move the head in proximity with a recording surface of the disk. The first peak filter has a fixed peak frequency and a variable gain, and is configured to be inserted into a servo loop. The servo loop is configured to position the head with position error signals between servo data read by the head and a target position. The adaptive peak filter has a variable peak frequency and a variable gain, and is configured to be inserted into the servo loop. The filter controller is configured to control the gain of the adaptive peak filter according to the gain of the first peak filter. | 06-10-2010 |
20110058276 | SERVO CONTROL OF A DISK DRIVE - A disk drive comprising a head for accessing a disk, an actuator for moving the head in the radial direction of the disk and a controller. The controller for servo control of the actuator based on servo data read out from the disk by the head. The controller is configured for maintaining a width of the adaptive chasing notch filter below a specified value in servo system control and estimating an oscillation frequency of the actuator. | 03-10-2011 |
20110069411 | HEAD SERVO CONTROL SYSTEM AND HEAD SERVO CONTROL METHOD - A servo control system configured to position a head in accordance with position error signals between servo data on a disk read by the head in a servo sampling cycle and a target position. The system includes a plurality of adaptive peak filters connected in parallel configured to filter the position error signals and configured to change filter coefficients adaptively, and an estimator configured to estimate head vibration caused by disturbances using the servo data read by the head. The system further includes a selector configured to select a portion of the plurality of adaptive peak filters at preset occasions, and a setter configured to update coefficient settings of the portion of the adaptive peak filters selected by the selector in accordance with an estimation by the estimator. | 03-24-2011 |