A communications cable is provided that includes a pair of twisted pair of wires, each coated with a fluoropolymer insulator. The twisted pair of wires is configured to carry a differential signal, such as a differential data signal and/or a differential power signal. The fluoropolymers are highly effective insulators and significantly reduce both the effects of internal and external electromagnetic interference while maintaining low cable attenuation, even when operating within a temperature range of −40° C. to 150° C.

The present invention provides a low-dielectric resin composition comprising (A) a urethane resin obtained by reacting a polycarbonate diol and an isocyanate, (B) an epoxy resin, and (C) a filler, wherein the (A) urethane resin has a carboxyl group equivalent weight of 1,100 to 5,700 g/eq; the epoxy equivalent weight of the (B) epoxy resin is 0.3 to 4.5 equivalents per 1.0 equivalent of the carboxyl group of the (A) urethane resin, the (A) urethane resin has a weight-average molecular weight of 5,000 to 80,000; the (A) urethane resin has a polycarbonate content of 35% by mass or lower; the resin composition comprises 50 parts by mass or less of the (C) filler per 100 parts by mass of the (A) urethane resin; and the resin composition comprises substantially no imido group.

A cable includes a plurality of electric wires, which are laid helically around a center of the cable and along a central axis of the cable, and a sheath provided to cover respective peripheries of the plurality of electric wires together. The sheath includes an inner layer sheath made of a urethane resin, and an outer layer sheath provided around an outer periphery of the inner layer sheath to protect the inner layer sheath. The cable may further include a core member at its center. The sheath may be composed of a single layer instead of plural layers.

Ribbon cables including a plurality of spaced apart substantially parallel conductors extending along a length of the cable and arranged along a width of the cable, and first and second insulative layers disposed on opposite sides of and substantially coextensive with the plurality of conductors along the length and width of the cable are described. Each insulative layer may be adhered to the conductors and may include alternating substantially parallel thicker and thinner portions extending along the length of the cable. The thicker portions of the first and second insulative layers are substantially aligned in one to one correspondence. Each corresponding thicker portion of the first and second insulative layers have at least one conductor in the plurality of conductors disposed therebetween. The thicker portions may have an effective dielectric constant less than 2.

The present invention discloses a preparation method of an insulating dielectric for improving energy density, including dissolving 1,4-phenylene diisothiocyanate in a polar solvent, then adding an organic diamine, and reacting at room temperature for 3 h to 6 h under a nitrogen atmosphere; then adding 4,4-oxydianiline and pyromellitic dianhydride, and reacting at room temperature for 12 h to 18 h under a nitrogen atmosphere to obtain a random copolymer solution of polythiourea and polyamic acid; and spreading the random copolymer solution of polythiourea and polyamic acid on a copper plate, and carrying out gradient temperature elevation to obtain a random copolymer of polythiourea and polyimide.

Various embodiments include a sprayable formulation for an insulation system of an electrical machine, the formulation comprising a sprayable resin mixture including: a monomeric and/or oligomeric, at least diepoxidic carbon-based first resin component; and a monomeric and/or oligomeric second resin component based on alkyl-/arylpolysiloxane with at least one glycidyl ester and/or glycidyl ether functionalities; and a curing agent and based on at least one of: anhydride, (poly)amine, and amino- and/or alkoxy-functional alkyl-/arylpolysiloxane.

The present invention relates to a method for casting electronic components. The invention also relates to a curable compound that can be used as casting compound in the method. The casting compound contains at least one cross-linking component which is homogeneously distributed in the casting compound and can cross-link to at least two different cross-linked systems. A first of these networks has a higher cross-link density than a second cross-linked system, wherein the cross-linking to the first cross-linked system is triggered via an event other than the cross-linking to the second cross-linked system. During casting, the at least one cross-linking component of the casting compound is cured at least in part to the first cross-linked system in at least one first region spaced from the components and at least to the second cross-linked system in a second region enclosing and immediately surrounding the components.

A ribbon cable can include a plurality of spaced apart substantially parallel conductor sets. The conductor set includes a plurality of spaced apart substantially parallel conductors extending along a length of the conductor set and arranged along a width of the conductor set; first and second non-conductive structured layers disposed on opposite sides of and substantially coextensive with the plurality of conductors along the length and width of the conductor set; and a conductive shielding layer wrapped around the first and second non-conductive structured layers. Each structured layer is adhered to the conductors and includes a plurality of higher dielectric constant regions defining a plurality of lower dielectric constant regions therebetween.

The present invention relates to thermoplastic polyurethanes obtainable or obtained by a process comprising the reaction of a thermoplastic polyester (PE-1) with a diol (D1) to give a composition (Z1) comprising a polyester (PE-2), and the reaction of the composition (Z1) obtained in step (i) with an isocyanate composition (I1) comprising at least one polyisocyanate, and with a polyol composition (P1), where the polyol composition (P1) comprises at least one polycarbonate polyol (PC1), and also to a process for the production of the thermoplastic polyurethane. The present invention further relates to a composition comprising a thermoplastic polyurethane of the invention and at least one flame retardant. The present invention also relates to the use of this thermoplastic polyurethane for the production of cable sheathing, and also to films, moldings, rollers, fibers, automobile cladding, hoses, cable plugs, folding bellows, drag cables, cable sheathing, gaskets, belts or damping elements comprising this thermoplastic polyurethane.

The present invention relates to a flame-retardant composition, a method for preparing the same and an article therefrom.