Abstract: The present application relates to a preparation that is pumpable, thermally curable and expandable at application temperatures, typically in the range of 30 to 120° C., and contains at least one solid rubber, at least one liquid rubber, at least one thermally activatable blowing agent and a curing agent system containing at least one peroxide and at least one quinone, quinone dioxime or dinitrosobenzene, to a method for stiffening structural components having thin-walled structures using such preparations or for sealing cavities in structural components using such preparations, and to the use of these preparations for stiffening such structures or for sealing cavities in structural components.

Abstract: The present specification relates to thermally expandable formulations comprising (a) at least one peroxidically crosslinkable binary copolymer comprising at least one monomer unit selected from vinyl acetate, (meth)acrylic acids and derivatives thereof, the binary copolymer having a melt flow index of not more than 3 g/10 min, as determined in accordance with DIN EN ISO 1133 and with a test load of 2.16 kg and a test temperature of 190° C., (b) at least one peroxide, (c) at least one chemical blowing agent, and (d) at least one polymer based on one or more diene monomers, and (e) at least one terpolymer based on at least one first monomer selected from singly or multiply unsaturated hydrocarbons, and on at least one second monomer selected from (meth)acrylic acids and derivatives thereof. The thermally expandable formulations exhibit a high level of persistence during the heating of the material as required for curing/expansion.

Abstract: The present specification relates to thermally expandable formulations comprising (a) at least one peroxidically crosslinkable binary copolymer comprising at least one monomer unit selected from vinyl acetate, (meth)acrylic acids and derivatives thereof, the binary copolymer having a melt flow index of not more than 3 g/10 min, as determined in accordance with DIN EN ISO 1133 and with a test load of 2.16 kg and a test temperature of 190° C., (b) at least one peroxide, (c) at least one chemical blowing agent, and (d) at least one polymer based on one or more diene monomers, and (e) at least one terpolymer based on at least one first monomer selected from singly or multiply unsaturated hydrocarbons, and on at least one second monomer selected from (meth)acrylic acids and derivatives thereof. The thermally expandable formulations exhibit a high level of persistence during the heating of the material as required for curing/expansion.

Abstract: The invention relates to a composition that can be thermally cured, containing relative to the total composition, a) 5 to 90% by weight of a diene-based polymer or copolymer containing an olefinic double bond and/or an aromatically substituted olefin, wherein the polymer or copolymer is liquid, or paste-like, at 22° C. and has a glass transition temperature between ?30° C. and +15° C., measured according to a DSC method; b) a vulcanization system selected from the group consisting of: b1) sulfur, and one or more accelerator(s), b2) peroxidic or disulfidic vulcanization systems, b3) quinones, quinone dioximes, or dinitrosobenzene.

Abstract: The invention relates to a composition that can be thermally cured, containing relative to the total composition, a) 5 to 90% by weight of a diene-based polymer or copolymer containing an olefinic double bond and/or an aromatically substituted olefin, wherein the polymer or copolymer is liquid, or paste-like, at 22° C. and has a glass transition temperature between ?30° C. and +15° C., measured according to a DSC method; b) a vulcanization system selected from the group consisting of: b1) sulfur, and one or more accelerator(s), b2) peroxidic or disulfidic vulcanization systems, b3) quinones, quinone dioximes, or dinitrosobenzene.

Abstract: A data storage apparatus (HDD unit) having a cartridge, attachable to and detachable from a personal computer, incorporating a recording disk, comprises a switch circuit for inhibiting data reading and writing with respect to a magnetic disk and a locking mechanism for detecting that the cartridge is detached from the personal computer and causing data reading and writing inhibiting means to operate in response to the detection.

Abstract: A head driving device of a disk recording/reproducing device, which has a plurality of heads mounted thereon to record/reproduce data in and from a disk for positioning the plurality of heads in target positions by moving these in a radial direction of the disk, comprises a plurality of suspension members for respectively supporting the plurality of heads, a head arm member having a plurality of support arms for supporting the plurality of suspension members for transmitting rotary driving forces for moving the plurality of heads, main driving section for moving the plurality of heads by rotary-driving the head arm member, and sub-driving section for integrally driving the plurality of support arms in a fine manner and fine-adjusting movements of the plurality of heads moved by the main driving section.

Abstract: A magnetic head drive of the present invention comprises a composite magnetic head structured by integrally combining a write head into a record head and a magnetic disk having a servo area where position information of the composite magnetic head is recorded and a data area where data is recorded, and the servo area includes a positioning data area having head positioning information, and the head has an erased area generated by recording an AC signal having a frequency higher than a burst pattern in an area other than the burst pattern including information of positioning the composite magnetic head of said positioning data area.

Abstract: A data storage apparatus (HDD unit) having a cartridge, attachable to and detachable from a personal computer, incorporating a recording disk, comprises a switch circuit for inhibiting data reading and writing with respect to a magnetic disk and a locking mechanism for detecting that the cartridge is detached from the personal computer and causing a data reading and writing inhibiting device to operate in response to the detection.

Abstract: A magnetic head drive including a composite magnetic head structured by integrally combining a write head into a record head and a magnetic disk having a servo area where position information of the composite magnetic head is recorded and a data area where data is recorded. The servo area includes a positioning data area having head positioning information, and the head has an erased area generated by recording an AC signal having a frequency higher than a burst pattern in an area other than the burst pattern including information of positioning the composite magnetic head of said positioning data area.

Abstract: A disk system has a disk as a recording medium, and a disk recording/reproducing apparatus for recording and reproducing data by a head radially movable provided on a disk by a head moving mechanism, and the disk has a first region formed with a servo sector having servo information along a data track for recording and reproducing data on a disk, second regions having servo sectors having servo information along a servo track and of the number of magnification of integer number of the servo sectors in the first region, and the disk recording/reproducing apparatus has, position detecting section placed on the moving portion of the head moving mechanism for detecting the moving position of a head to output a position signal representing the head position in the radial direction of the disk, memory section for storing "head follow-up information" for a servo track obtained from the position signal in the state that the head is positioned on the servo track, and section for controlling to follow up the head to th

Abstract: A magnetic disk storage device has a magnetic disk with a storing/reproduction region formed thereon and a head slider facing the disk surface with a plurality of parallel projections to generate an air bearing. Magnetic heads each having a head gap are provided in the projections and have an interval between head gaps of at least 1/N of the width of the whole storing/reproduction region of the disk where N is the number of heads. The device makes it feasible to increase the number of heads per disk and to shorten the seek distance without increasing the weight of the head actuator.

Abstract: A magnetic disk adapted for use in a magnetic disk apparatus, which has a magnetic head with a pre-erase gap and a read/write gap with a predetermined spacing therebetween, and which uses a sector servo system to position the magnetic head onto a target track of the disk, is divided into a plurality of sectors each having an address field and a data field. A spacing gap having a length corresponding to the spacing between the erase and read/write gaps is formed at the beginning of each of the address and data fields. Servo information is provided at least in the spacing gap of the address field. The magnetic disk apparatus energizes the read/write and erase gaps at different timings, so that the initiation and termination of data erasing are performed prior to the initiation and termination of data writing, respectively.

Abstract: Disclosed is a disk memory having a plurality of data sectors and servo sectors each provided between adjacent data sectors, spiral tracks being formed in each data sector and each servo sector. Servo information patterns are formed in each servo sector. To cause a read/write head to trace spiral tracks, the phases of the servo patterns with respect to servo tracks are sequentially displaced, from the first servo sector to the final m-th servo sector, by a value obtained by dividing the track pitch of the servo tracks by the number of servo sectors. In the m-th servo sector a servo index used for detecting that the servo sector is formed. A disk device is also disclosed which performs tracking control for the head along the spiral tracks.