The present invention relates to a rubber composition based on at least one elastomer matrix comprising from 45 to 80 phr of at least one polyisoprene and from 20 to 55 phr of at least one highly saturated diene elastomer; an aliphatic diacid dialkyl ester plasticizer, carbon black, and a crosslinking system; in which the highly saturated diene elastomer is a copolymer of ethylene and 1,3-diene.

An object of the present invention is to provide a laminate of an olefin-type rubber, which is non-polar or has a small polarity and which is difficult to bond with a different material, and a rubber comprising Group 15 elements, which is a different kind of rubber. The laminate according to the present invention includes a structure including, in order, an olefin-type rubber layer (A); an adhesive resin layer (B) containing at least one selected from the group consisting of an ethylene/vinyl acetate copolymer, a silane-modified ethylene/vinyl acetate copolymer, an ethylene/acrylic acid copolymer and an ionomer thereof, and an ethylene/methacrylic acid copolymer and an ionomer thereof; and a layer (C) containing a rubber containing Group 15 elements.

The present invention relates to a branched modifier and a composition comprising more than 25 wt % (based on the weight of the composition) of one or more linear ethylene polymers having a g.sub.vis of 0.97 or more and an Mw of 20,000 g/mol or more and at least 0.1 wt % of a branched modifier where the modifier has a) a g.sub.vis of 0.70 or less; b) an Mw of 100,000 g/mol or more; c) an Mw/Mn of 4.0 or more; d) a shear thinning ratio of 110 or more, e) a melt strength of 10 cN or more; f) a complex viscosity at 0.1 rad/sec at 190 C. of at least 130,000 Pa.Math.s; and g) a phase angle of Z or less where Z=138.3G*.sup.(0.142), where G* is the complex modulus reported in Pascals measured at 190 C. and the phase angle units are reported in degrees, wherein the G* is from 1,000 to 1,000,000 Pa.

The present invention relates to a branched modifier and a composition comprising more than 25 wt % (based on the weight of the composition) of one or more linear ethylene polymers having a g.sub.vis of 0.97 or more and an Mw of 20,000 g/mol or more and at least 0.1 wt % of a branched modifier where the modifier has a) a g.sub.vis of 0.70 or less; b) an Mw of 100,000 g/mol or more; c) an Mw/Mn of 4.0 or more; d) a shear thinning ratio of 110 or more, e) a melt strength of 10 cN or more; f) a complex viscosity at 0.1 rad/sec at 190 C. of at least 130,000 Pa.Math.s; and g) a phase angle of Z or less where Z=138.3G*.sup.(0.142), where G* is the complex modulus reported in Pascals measured at 190 C. and the phase angle units are reported in degrees, wherein the G* is from 1,000 to 1,000,000 Pa.

Provided is a heat-dissipating resin composition including: a rubber material having an average emissivity of 80% or higher in a wavelength range from 5 m to 20 m; and a filler having a grain diameter of 15 m or smaller and an aspect ratio of 3 to 10, wherein the heat-dissipating resin composition has an emissivity of 90% or higher in the wavelength range from 5 m to 20 m.

Provided is a heat-dissipating resin composition including: a rubber material having an average emissivity of 80% or higher in a wavelength range from 5 m to 20 m; and a filler having a grain diameter of 15 m or smaller and an aspect ratio of 3 to 10, wherein the heat-dissipating resin composition has an emissivity of 90% or higher in the wavelength range from 5 m to 20 m.

The invention relates to a rubber composition which comprises a reinforcing filler, a vulcanization system and more than 50 to 100 phr of an elastomer which contains more than 50 mol % of ethylene units and which is a copolymer of ethylene, of a first 1,3-diene which is 1,3-butadiene, isoprene or a mixture thereof, and of a second 1,3-diene of formula CH.sub.2?CRCH?CH.sub.2, the symbol R representing an unsaturated aliphatic hydrocarbon chain having 3 to 20 carbon atoms.

A rubber composition comprising 0.1 to 2.5 parts by weight of a lubricant having a flow temperature of 50 to 100? C. based on 100 parts by weight of an ethylene/butene/5-ethylidene-2-norbornene terpolymer. This rubber composition is compounded with a specific lubricant, has the following effects. That is, the rubber composition prevents difficulties caused by sticking between unvulcanized rubber compound, improves productivity in the rubber compound preparation process and the vulcanization molding process of crosslinked molded products, such as seal members, and does not impair the low temperature properties of the crosslinked molded products. This rubber composition is effectively used as a crosslinking molding material for seal parts, for which a high pressure gas sealing function is particularly required in a low temperature environment, e.g., ?39? C. or lower.

A rubber composition comprising 0.1 to 2.5 parts by weight of a lubricant having a flow temperature of 50 to 100? C. based on 100 parts by weight of an ethylene/butene/5-ethylidene-2-norbornene terpolymer. This rubber composition is compounded with a specific lubricant, has the following effects. That is, the rubber composition prevents difficulties caused by sticking between unvulcanized rubber compound, improves productivity in the rubber compound preparation process and the vulcanization molding process of crosslinked molded products, such as seal members, and does not impair the low temperature properties of the crosslinked molded products. This rubber composition is effectively used as a crosslinking molding material for seal parts, for which a high pressure gas sealing function is particularly required in a low temperature environment, e.g., ?39? C. or lower.

A cable comprising one or more conductors surrounded by at least an inner semiconductive layer, an insulation layer and an outer semiconductive layer, in that order, wherein the insulation layer is not crosslinked and comprises at least 90 wt % of a polymer composition, said polymer composition comprising: (I) 85.0 to 99.5 wt % of an LDPE; and (II) 0.5 to 15.0 wt % of an HDPE having a density of at least 940 kg/m.sup.3 or 1.5 to 15.0 wt % of an ultra-high molecular weight polyethylene having a Mw of at least 1,000,000.