Object: It is desirable to provide a waterproof connection structure, a connection structure body, and a partition member that can easily and reliably prevent water penetration. Resolution Means: The waterproof connecting portion (1A) of a connection structure body (1) includes an FFC (30) formed by sandwiching a plurality of flat conductors (41) arranged in parallel in a width direction in a sheet-like insulating covering, a plurality of insulated wires (40) each obtained by covering a conductor (41) with an insulating covering (42), a plurality of WF terminals (20) that are arranged in parallel in the width direction and connect the flat conductors (41) and the conductors (41), a terminal holder (10) that partitions the WF terminals (20) in an insulating manner, and a butyl sheet (50) that integrally covers the plurality of WF terminals (20) partitioned by the terminal holder (10) and the terminal holder (10), and has waterproofing properties, insulating properties, and stretching properties.

A fire resistant coaxial cable and method of making is described that has a 2-part dielectric made of a polymer foam and a ceramifiable silicone rubber. The polymer foam, which can be polypropylene or other polymers, leaves little-to-no residue in the cable that causes electromagnetic loss when upon burning. The polymer foam can be extruded over a center conductor using an inert gas, such as nitrogen, to propagate the foam, ensuring little-to-no residue in the cable. The ceramifiable silicone rubber can be extruded over the polymer foam. The ceramifiable silicone rubber can have a polysiloxane matrix with inorganic flux and refractory particles that ceramify under high heat, such as temperatures specified by common fire test standards (e.g., 1850 F./1010 C. for two hours). The cable is configured to maintain a relatively coaxial relation between a center conductor and an outer conductor even under aforementioned fire tests. Another layer of ceramifiable silicone rubber surrounds the outer conductor and continues to insulate it from the outside if a low-smoke zero-halogen (LSZH) jacket burns away.

Disclosed herein are a silicone rubber composition and a power cable. The silicone rubber composition has excellent insulation properties and a high permittivity and which can further become a silicone dielectric material having a low specific gravity and a high strength. The power cable in which a terminal connection part or an intermediate connection part is composed of a cured molded product of the just-mentioned composition. The silicone rubber composition includes (A) 100 parts by weight of an organopolysiloxane containing at least two Si-bonded alkenyl groups in one molecule thereof, (B) 5 to 50 parts by weight of a reinforcing silica having a specific surface area measured by a BET method of 50 m.sup.2/g to 400 m.sup.2/g, (C) 0.3 to 3 parts by weight of carbon nanotubes having an average diameter of 0.5 nm to 50 nm, and (D) a curing agent in an amount necessary for curing of the composition. A cured molded product of the composition has a volume resistivity of at least 10.sup.10 .Math.cm and a relative permittivity of at least 5.

Disclosed herein are a silicone rubber composition and a power cable. The silicone rubber composition has excellent insulation properties and a high permittivity and which can further become a silicone dielectric material having a low specific gravity and a high strength. The power cable in which a terminal connection part or an intermediate connection part is composed of a cured molded product of the just-mentioned composition. The silicone rubber composition includes (A) 100 parts by weight of an organopolysiloxane containing at least two Si-bonded alkenyl groups in one molecule thereof, (B) 5 to 50 parts by weight of a reinforcing silica having a specific surface area measured by a BET method of 50 m.sup.2/g to 400 m.sup.2/g, (C) 0.3 to 3 parts by weight of carbon nanotubes having an average diameter of 0.5 nm to 50 nm, and (D) a curing agent in an amount necessary for curing of the composition. A cured molded product of the composition has a volume resistivity of at least 10.sup.10 .Math.cm and a relative permittivity of at least 5.

An adhesive sheet including a substrate and adhesive layers that are arranged on one surface of the substrate with a primer layer being interposed therebetween, wherein the adhesive layers include a natural rubber and a tackifier, the adhesive sheet has a volume resistivity of 11010 cm or more and a tensile modulus at 100% elongation of 50 MPa or less as determined in accordance with JIS K 6251, the adhesive layers have a probe tack of 10N/cm2 or less as determined in accordance with ASTM D 2979, the adhesive force between the adhesive layers having a width of 15 mm is 1.5 N or more, and the adhesive force between the substrate and the adhesive layers having a width of 15 mm is 1.5 N or less.

An adhesive sheet including a substrate and adhesive layers that are arranged on one surface of the substrate with a primer layer being interposed therebetween, wherein the adhesive layers include a natural rubber and a tackifier, the adhesive sheet has a volume resistivity of 11010 cm or more and a tensile modulus at 100% elongation of 50 MPa or less as determined in accordance with JIS K 6251, the adhesive layers have a probe tack of 10N/cm2 or less as determined in accordance with ASTM D 2979, the adhesive force between the adhesive layers having a width of 15 mm is 1.5 N or more, and the adhesive force between the substrate and the adhesive layers having a width of 15 mm is 1.5 N or less.

Flooding compounds for telecommunications cables. Such flooding compounds contain a polyolefin elastomer and a hydrocarbon oil. The polyolefin elastomer has a crystallinity ranging from 10 less than 50 weight percent and a dynamic viscosity of 50,000 centipoise or less at 177 C. The hydrocarbon oil has a kinematic viscosity of 200 centistokes or less at 40 C.

Flooding compounds for telecommunications cables. Such flooding compounds contain a polyolefin elastomer and a hydrocarbon oil. The polyolefin elastomer has a crystallinity ranging from 10 less than 50 weight percent and a dynamic viscosity of 50,000 centipoise or less at 177 C. The hydrocarbon oil has a kinematic viscosity of 200 centistokes or less at 40 C.

There are provided a process for producing an electrical wire molded body comprising: step I of melting and kneading a polyethylene-based resin (a), a polypropylene-based resin (b), a block copolymer (c) of an aromatic vinyl-based compound and a conjugated diene-based compound and the like, and a silane coupling agent (g), and other components, to produce a silane crosslinkable flame retardant polyolefin (A); step II of melting and kneading a polymer selected from the components (a) to (c) and a silanol condensation catalyst (i), to produce a silanol catalyst rein composition (B); and step III of mixing the components (A) and (B), melt molding the mixture on a conductor and then crosslinking the molded body in the presence of water.

Elastomer compositions with high dielectric constants are disclosed. Embodiments of the disclosure include a high dielectric constant (high-K) elastomeric composition comprising an elastomer, carbon black (CB), and organoclay (OC). The composition is not dependent on any raw material with inherent high-k or any metal oxide type material that changes conductivity with applied voltages. The composition instead uses distributed electric fields and polarizability with carbon black and organoclays. This allows for a high-k material through polarizability with limited large-scale electron sharing.