39results about How to "Low hysteresis loss" patented technology

Apparatus for supplying energy to a load, comprises a power supply unit (102) e.g. a switched mode electronic transformer or electronic ballast having an input for receiving current at mains frequency and a means for stepping-up said mains frequency to a higher frequency e.g. 30-50 kHz and an output for delivering energy at the higher frequency. A two part connector (108) has a first core portion (106) that has a primary winding (104) connected to the output of the power supply unit and a mating second core portion (112) that has a secondary winding (110) for delivery of energy to a load (114), the core portions being of a high resistivity material, e.g. a ferrite having a resistivity of at least 10⁴ Ωcm. The apparatus may be used to power e.g. low voltage halogen or other incandescent lighting, fluorescent lighting, or an electric motor, a power supply for a computer, radio, television or like electronic device, a heater or the like.

A soft magnetic material includes a plurality of composite magnetic particles (40) each including a metal magnetic particle (10) and an insulation coating (20) covering the surface of the metal magnetic particle (10), wherein the insulation coating (20) contains Si (silicon), and 80% or more of Si contained in the insulation coating constitutes a silsesquioxane skeleton. Therefore, it is possible to effectively decrease a hysteresis loss while suppressing an increase in eddy-current loss.

There is provided a modified conjugated diene-based polymer having a silyl group substituted with one or more alkoxy groups, and one or more nitrogen atoms on the chain ends of a conjugated diene-based polymer, the modified conjugated diene-based polymer being obtained by polymerizing a conjugated diene compound, or copolymerizing a conjugated diene compound with an aromatic vinyl compound, by using a polyfunctional anionic polymerization initiator prepared from a polyvinyl aromatic compound and an organolithium compound in a range of a molar ratio (the polyvinyl aromatic compound/the organolithium compound) of from 0.05 to 1.0, so as to obtain the conjugated diene-based polymer, and by reacting a living polymer end of the conjugated diene polymer with the compound having a silyl group substituted with two or more alkoxy groups, and one or more nitrogen atoms.

Disclosed are: a photocrosslinkable polyrotaxane having a high scratch resistance, low hysteresis loss and so on; a composition comprising the photocrosslinkable polyrotaxane and so on; a crosslinked body obtained from the composition; and methods for producing the same. Specifically disclosed are: a photocrosslinkable polyrotaxane comprising a cyclic molecule of polyrotaxane, wherein pseudo-polyrotaxane is formed by piercing the opening of a cyclic molecule by a straight-chain molecule to form a clathrate therewith and blocking groups are positioned at both ends of the pseudo-polyrotaxane to prevent the withdrawal of the cyclic molecule, said cyclic molecule of polyrotaxane having a group represented by -M-Y (wherein M is represented by formula II; X represents a straight-chain alkylene group having 1-8 carbon atoms, etc.; n is 1-10 on average; and Y represents a group having a photopolymerizable group); a composition comprising the photocrosslinkable polyrotaxane and so on; a crosslinked body derived from the composition; and methods for producing the same.

The invention relates to mercaptosilane of the general formula I, wherein R<1> is an alkyl polyether group -O-(R<5>-O)-R<6>. They are prepared by a procedure in which a silane of the general formula II is subjected to a catalytic reaction with an alkyl polyether R<1>-H with the same specification as the above, R<7>-OH being split off, the molar ratio of the alkyl polyether R<1>-H to the silane of the general formula II is at least 0.5 and R<7>-OH is separated off from the reaction mixture continuously or discontinuously. They can be used in shaped articles.

There are provided a rubber masterbatch which can give a vulcanized rubber having a low hysteresis loss while having a low electrical resistance (low volume electrical resistance value); and a method for producing the rubber masterbatch. The rubber master-batch is a rubber masterbatch including a diene rubber, a carbon nanotube, and a silane coupling agent, and the carbon nanotube shows a weight loss proportion of 10 to 30% by weight in a range from 200 to 600° C. in a thermogravimetry of the carbon nanotube.

A flexible optical fiber composite submarine cable comprises four power cable cores, a communication optical cable, an aramid reinforcing rib, a polyurethane filling layer, an inner protecting layer,an aramid braiding layer and a polyurethane outer protecting layer, wherein the power cable cores, the communication optical cable and the aramid reinforcing rib are located in the middle, and the polyurethane filling layer, the inner protecting layer, the aramid braiding layer and the polyurethane outer protecting layer are located on the outer side. The aramid reinforcing rib is arranged at thecenter of a torus formed by the four power cable cores and the communication optical cable; each power cable core comprises a class-V oxygen-free copper flexible conductor, a butyronitrile-PVC compound insulating layer and a copper wire braiding shielding layer in sequence from inside to outside, and each class-V oxygen-free copper flexible conductor is formed by twisting multiple tinned annealedsoft copper wires; a twelve-core optical fiber is arranged in the communication optical cable, and the outer layer of the twelve-core optical fiber is provided with a stainless steel tube, a PE protecting bush and a polyurethane protecting layer in sequence; the polyurethane filling layer is arranged between the inner protecting layer and the power cable cores and the communication optical cable.The flexible optical fiber composite submarine cable has the advantages of being good in waterproofness, flexibility and creep resistance, light in weight, small in size, high in tensile strength andthe like.

This invention relates to a rubber composition having a high interaction between rubber component and carbon black, a good wear resistance and an excellent low heat buildup (low hysteresis loss), and more particularly to a rubber composition comprising (A) 100 parts by mass of a rubber component containing not less than 10% by mass of a conjugated diene polymer having a polymer chain with at least one functional group selected from the group consisting of particular substituted amino group and cyclic amino group, (B) not less than 20 parts by mass of carbon black and (C) not more than 1.0 part by mass of a polycyclic aromatic compound (PCA).

A method for producing a rubber composition, the method including: preparing a modified natural rubber by releasing protein from rubber particles in a natural rubber latex by adding at least one organic compound selected from formaldehyde, paraformaldehyde, formalin, and glyoxal to the above mentioned natural rubber latex and then drying so as to include the released protein therein; and mixing at least one selected from carbon black and silica in this modified natural rubber. Such method reduces viscosity and improves molding processibility of the rubber composition, as well as reducing hysteresis loss.

Disclosed is a grain-oriented electrical steel sheet exhibiting low hysteresis loss and low coercive force, in which an increase in hysteresis loss due to laser irradiation or electron beam irradiation, which has been a conventional concern, is effectively inhibited. The grain-oriented electrical steel sheet has closure domain regions (X) formed to divide the magnetic domains in a rolling direction, from one end to the other in the width direction of the steel sheet, provided that Expression (1) is satisfied:

−(500t−80)×s+230≦w≦−(500t−80)×s+330  Expression (1),

where t represents a sheet thickness (mm); w represents a smaller one of the widths (μm) of the regions measured on the front and rear surfaces of the steel sheet, respectively, by using a Bitter method; and s represents an average number of the regions present within one crystal grain.

To provide a urethane resin for sliding members which has high abrasion resistance and is considered that crosslinking points are uniformly dispersed so that molecular motion is suitably possible. Particularly, to provide the urethane resin can be advantageously used as a polishing pad.

There is provided the urethane resin for polishing is obtained by polymerizing a polymerizable composition comprising (A) a polyrotaxane having a composite molecular structure formed by an axial molecule and a plurality of cyclic molecules clathrating the axial molecule and side chains having an active hydrogen group introduced into at least some of the cyclic molecules and (B) a polyiso(thio)cyanate compound.

The invention relates to modified conjugated diene-based polymer and a tire rubber composition using the same. Raw materials of modified conjugated diene-based polymer are provided. Through utilization of anionic polymerization technique in which an amphoteric initiator is effectively used, a rubber composite material is produced by a conjugated diene-based polymer having a combination of a linear structure modified by two special-structured terminals and having good silica compatibility and a branched conjugated diene-based polymer. It is possible to improve the dispersibility of the inorganic substance through increase of affinity with an inorganic filler.

A soft magnetic material includes: a plurality of composite magnetic particles formed from a metal magnetic particle and an insulative coating surrounding a surface of the metal magnetic particle and containing metallic salt phosphate and/or oxide; and a lubricant formed as fine particles added at a proportion of at least 0.001 percent by mass and no more than 0.1 percent by mass relative to the plurality of composite magnetic particles. With this structure, superior lubrication is provided during compacting and desired magnetic characteristics can be obtained after compacting.

Disclosed is a sulfur-containing conjugated diolefin copolymer rubber composed of a conjugated diolefin and an aromatic vinyl compound, wherein (1) the content of sulfur bound to the rubber is 0.01 mmol % or more, (2) the content of the aromatic vinyl compound polymerization unit is not less than 5 wt % and less than 45 wt % relative to the amount of the copolymer rubber, and (3) the content of a vinyl bond (a 1,2-bond) in the conjugated diolefin polymerization unit is 30 mol % or more relative to the amount of the conjugated diolefin polymerization unit. In the the copolymerization between the conjugated diolefin and the aromatic vinyl compound, a specific sulfur-containing polymerization terminator is used to terminate the reaction of the copolymerization. The sulfur-containing conjugated diolefin copolymer rubber has good processability and a good balance among wear resistance, fracture properties and low hysteresis loss.