A multimodal polyethylene copolymer suitable for use in cable insulation comprising: (III) 45 to 55 wt % of a lower molecular weight component which is an ethylene copolymer of ethylene and at least one C3-12 alpha olefin comonomer, said LMW component having a density of 940 to 962 kg/m.sup.3 and an MFR.sub.2 of 50 to 500 g/10 min; (IV) 55 to 45 wt % of a higher molecular weight ethylene copolymer component of ethylene and at least one C3-12 alpha olefin comonomer;

wherein said multimodal polyethylene copolymer has a density of 940 to 950 kg/m.sup.3, an MFR.sub.2 of 0.05 to 2.0 g/10 min and preferably at least one of crystallization half time>3.0 mins at 120.5° C., a crystallization half time>5.0 mins at 121° C. or a crystallization half time>10.0 mins at 122° C.

A polyolefin composition made from or containing:

a) from 85% to 98% by weight of a composition made from or containing: A) a copolymer of butene-1 with ethylene having a copolymerized ethylene content of up to 18% by mole and no melting peak detectable at the DSC at the second heating scan; and B) an inorganic filler; wherein the B)/A) weight ratio being from 0.3 to 4; and
b) from 2% to 15% by weight of an additional polyolefin different from A).

In a communication cable having a multi-core cable with a plurality of core cables in which a pair of signal lines are covered with an insulator, in which the insulator is covered with a shield tape, and in which the shield tape is covered with a wrapping tape, and having a connector formed on an end portion of the multi-core cable, the communication cable further has a case which is inserted/removed to/from a slot formed on a communication device to which the communication cable is connected, a substrate which is housed in the case and to which an end portion of the multi-core cable is connected, and a resin portion which molds a connection portion between the end portion of the multi-core cable and the substrate.

A high-voltage alternate current electric cable [is provided. In the electric cable,] having at least one metallic electric conductor is surrounded by at least one extruded insulating layer. The insulating layer includes from 1 wt % to 30 wt % of a void-containing filler. The filler is made of particles having an average diameter up to 50 pm dispersed in an insulating polymeric material.

The invention relates to a polymer composition comprising a polyethylene, a crosslinking agent and antioxidant(s), wherein the polymer composition contains a total amount of vinyl groups which is B vinyl groups per 1000 carbon atoms, and B.sub.1≤B, wherein B.sub.1 is 0.12, when measured prior to crosslinking according to method ASTM D6248-98, the crosslinking agent is present in an amount which is Z wt %, based on the total amount (100 wt %) of the polymer composition, and Z.sub.1≤Z≤Z.sub.2, wherein Z.sub.1 is 0.005 and Z.sub.2 is 2.0, and the antioxidant(s) is/are nitrogen containing antioxidant(s) being present in an amount which is W wt %, based on the total amount (100 wt %) of the polymer composition, and W.sub.1≤W≤W.sub.2, wherein W.sub.1 is 0.005 and W.sub.2 is 1.0, an article being e.g. a cable, e.g. a power cable, and processes for producing a polymer composition and an article; useful in different end applications, such as wire and cable (W&C) applications.

The invention relates to a cable comprising layer(s), which layer(s) is/are obtained from a polymer composition comprising a polyethylene, a crosslinking agent and antioxidant(s), characterized in that the polymer composition contains a total amount of vinyl groups which is B vinyl groups per 1000 carbon atoms, and B.sub.1≤B, wherein B.sub.1 is 0.12, when measured prior to crosslinking according to method ASTM D6248-98, the crosslinking agent is present in an amount which is Z wt %, prior to crosslinking, based on the total amount (100 wt %) of the polymer composition, and Z.sub.1≤Z≤Z.sub.2, wherein Z.sub.1 is 0.005 and Z.sub.2 is 2.0, and that the antioxidant(s) is/are nitrogen containing antioxidant(s) being present in an amount which is W wt %, prior to crosslinking, based on the total amount (100 wt %) of the polymer composition, and W.sub.1≤W≤W.sub.2, wherein W.sub.1 is 0.005 and W.sub.2 is 1.0, the cable, e.g. a power cable, and processes for producing the cable; the cable useful in different end applications, such as wire and cable (W&C) applications.

A resin is irradiated with an infrared ray, and a reflected ray from the resin irradiated with the infrared ray is received. In a reflection or absorption spectrum obtained by the reflected ray, a difference of a reflection intensity in a spectrum between a first wave number band of 1340 cm.sup.−1 to 1350 cm.sup.−1, inclusive, and a second wave number band of 1300 cm.sup.−1 to 1340 cm.sup.−1, inclusive, is calculated. It is determined whether or not a specific bromine-based flame retardant is contained in the resin, by using the calculated difference of reflection intensity in the spectrum.

A dielectric welding film capable of providing excellent adhesiveness to a variety of adherends in a short period of dielectric heating, and an welding method using the dielectric welding film are provided. The dielectric welding film is configured to adhere a pair of adherends of the same material or different materials through dielectric heating, the dielectric welding film including a first thermoplastic resin as an A1 component having a predetermined solubility parameter, a second thermoplastic resin as an A2 component having a solubility parameter larger than the solubility parameter of the first thermoplastic resin, and a dielectric filler as a B component. The welding method uses the dielectric welding film.

The invention belongs to the field of polymers, and relates to a grafting-modified polypropylene material for an insulating material and preparation method thereof. The grafting-modified polypropylene material comprises structural units derived from a polypropylene copolymer and structural units derived from an alkenyl-containing polymerizable monomer; the content of the structural units derived from the alkenyl-containing polymerizable monomer and in a grafted state in the grafting-modified polypropylene material is 0.1 to 14 wt %; the polypropylene copolymer has at least one of the following characteristics: the comonomer content is 0.5 to 40 mol %; the content of xylene solubles is 2 to 80 wt %; the comonomer content in the xylene solubles is 10 to 70 wt %; the intrinsic viscosity ratio of the xylene solubles to the polypropylene copolymer is 0.3 to 5. The grafting-modified polypropylene material of the invention can give consideration to both mechanical property and electrical property at a higher working temperature.

The invention belongs to the field of polymers, and relates to an anhydride group-containing polypropylene graft for an insulating material and preparation method thereof. The anhydride group-containing polypropylene graft comprises structural units derived from a polypropylene copolymer, structural units derived from an anhydride monomer and structural units derived from an alkenyl-containing polymerizable monomer; the content of the structural units derived from the anhydride monomer and the alkenyl-containing polymerizable monomer and in a grafted state in the anhydride group-containing polypropylene graft is 0.1 to 5 wt %, based on the weight of the anhydride group-containing polypropylene graft; and, the molar ratio of the structural units derived from the anhydride monomer to the structural units derived from the alkenyl-containing polymerizable monomer in the anhydride group-containing polypropylene graft is 1:1-20; the polypropylene copolymer has at least one of the following characteristics: the comonomer content is 0.5 to 40 mol %; the content of xylene solubles is 2 to 80 wt %; the comonomer content in the xylene solubles is 10 to 70 wt %; the intrinsic viscosity ratio of the xylene solubles to the polypropylene copolymer is 0.3 to 5. The anhydride group-containing polypropylene graft of the invention can give consideration to both mechanical property and electrical property at a higher working temperature.