To provide: an inorganic oxide powder which, when filled in a resin material, can simultaneously achieve a high dielectric constant and a low dielectric dissipation factor; a method for producing the same; and a resin composition comprising the inorganic oxide powder.

Provided is an inorganic oxide powder comprising a spherical titanium oxide powder and an aluminum oxide powder, wherein the aluminum content in the inorganic oxide powder is 20-50,000 mass ppm. Further provided is a resin composition comprising the inorganic oxide powder and at least one resin material selected from a thermoplastic resin and a thermosetting resin.

To obtain an insulating resin material serving as a material achieving both an excellent low specific dielectric constant and an excellent low linear thermal expansion coefficient, which has heretofore been difficult to obtain, and a metal layer-equipped insulating resin material and a wiring substrate each using the insulating resin material, provided is an insulating resin material, including: porous inorganic aggregates each having pores defined by a plurality of fine particles; and fibrils formed of polytetrafluoroethylene, wherein the fibrils are each multidirectionally oriented, wherein at least one of the porous inorganic aggregates and the fibrils are connected to each other, and wherein the insulating resin material is formed of a micro network structure having a porosity of 50% or more.

The present invention relates to a fire-resistant cable comprising at least one electrically insulating composite layer based on at least one cementitious material and at least one starch, and the process for manufacturing same.

The present invention provides an insulated wire having a heat-resistant insulating layer, wherein heat-resistant particles are contained in the insulating layer, and the heat-resistant particles are densely dispersed in a surface region of the insulating layer. For example, the concentration of heat-resistant particles included in a layer thick portion of 0.5 m from the surface of the insulating layer is two times the concentration of heat-resistant particles included in a central portion of the insulating layer. An electrodeposition liquid used to form the insulating layer is formed by dispersing the heat-resistant particles in a suspension in which resin particles are dispersed, the viscosity is 100 cP or less, and the turbidity is 1 mg/L or more.

A method that has a step (a) of melt-kneading 0.003 to 0.3 part by mass of an organic peroxide, 0.5 to 400 parts by mass of an inorganic filler, and more than 2 parts by mass and 15.0 parts by mass or less of a silane coupling agent, with respect to 100 parts by mass of a resin containing a halogen-containing resin, at a temperature equal to or higher than a decomposition temperature of the organic peroxide, to prepare a silane master batch; a heat-resistant crosslinked resin formed body obtained by the method, a silane master batch, a mixture and a formed body thereof, and a heat-resistant product.

Provided are hexagonal boron nitride aggregated particles and hexagonal boron nitride powder, each of which can be filled into a resin to produce a resin composition with an extremely high dielectric strength and thermal conductivity, and to reduce the density of the resin composition. Provided are hexagonal boron nitride aggregated particles, in which aggregated particles of hexagonal boron nitride primary particles have a longer diameter ranging from 5 to 10 ?m, a longer diameter/shorter diameter ranging from 1.0 to 1.3, and a circularity within a range from 0.3 to 0.8, and a maximum diameter of primary particles which can be confirmed on the surface of the aggregated particles on an SEM observation image at 10,000 magnification is 4 ?m or less. Provided is a hexagonal boron nitride powder including aggregated particles of hexagonal boron nitride primary particles, in which a particle size (D.sub.50) at a cumulative volume frequency of 50% in a particle size distribution as measured by a wet laser diffraction particle size distribution analysis is from 5 to 150 ?m, a volume-based median diameter of pores as measured by a mercury porosimetry is 3.0 ?m or less, and a content of impurity elements is 500 ppm or less.

A direct-current cable of an embodiment includes a conductive portion; and an insulating layer covering an outer periphery of the conductive portion, the insulating layer containing cross-linked base resin and inorganic filler, the base resin containing polyethylene, a BET specific surface area of the inorganic filler being greater than or equal to 5 m.sup.2/g, and a mean volume diameter of the inorganic filler being less than or equal to 5 ?m, the mass ratio of the inorganic filler with respect to the base resin being greater than or equal to 0.001 and less than or equal to 0.05, and the cross-linked base resin being cross-linked by a cross-linking agent containing organic peroxide.

An energy cable comprising at least one cable core comprising an electric conductor, a crosslinked electrically insulating system comprising an inner semiconducting layer, an insulating layer and an outer semiconducting layer and zeolite particles placed between the electric conductor and the inner semiconducting layer of the insulating system. The zeolite particles are able to efficiently extract and irreversibly absorb the by-products deriving from the cross-linking reaction, so as to avoid space charge accumulation in the insulating material during cable lifespan. This allows to eliminate the high temperature, long lasting degassing process of the energy cable cores having a crosslinked insulating layer, or at least to reduce temperature and/or duration of the same, so as to increase productivity and reduce manufacturing costs.

The present invention relates to an accessory for high-voltage direct-current (HVDC) energy cables comprising: at least one element made from a crosslinked elastomeric polymer material, and at least one scavenging layer comprising zeolite particles. The zeolite particles are able to scavenge, very efficiently and irreversibly, the by-products deriving from the cross-linking reaction, so as to avoid space charge accumulation in the element during the accessory lifespan. Moreover, the zeolite particles can prevent the crosslinking by-products present in the element of a non-degassed accessory from migrating towards the insulating layer of the energy cable on which the accessory is mounted.

Provided is a method of manufacturing a hybridized aerogel including preparing a silica sol including a silica precursor, a first organic solvent, and a first acidic catalyst, preparing an opacifier sol including an opacifier precursor, a second organic solvent, a gelation inducing agent, and a second acidic catalyst, forming a mixed sol by mixing the silica sol and the opacifier sol, forming a hybridized gel in which a silica gel and an opacifier gel are mixed by adding a basic catalyst to the mixed sol and making the mixed sol to be gelled, and acquiring a hybridized aerogel in which a silica aerogel and an opacifier aerogel are mixed by removing solvent from the hybridized gel.