The present disclosure provides a polymer composition. In an embodiment, an ethylene-based polymer composition is provided and is formed by high pressure (greater than or equal to 100 MPa), free-radical polymerization, by reacting: ethylene monomer and a mixture of hydrocarbon-based molecules, with each hydrocarbon-based molecule comprising three or more terminal alkene groups.

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.

A rubber composition based at least on natural rubber, on a copolymer of ethylene and of a 1,3-diene, on a carbon black and on a crosslinking system is provided. The carbon black content ranges from 20 phr to 40 phr, the volume fraction of carbon black ranges from 8% to 15%, the copolymer content ranges from 20 phr to less than 50 phr, the natural rubber content is greater than 50 phr, and the copolymer contains more than 50 mol % of ethylene. Such a composition exhibits an improved compromise between the properties of cohesion, stiffness, hysteresis and resistance to ozone. Such a composition is preferentially used in a tire sidewall.

A rubber composition based at least on natural rubber, on a copolymer of ethylene and of a 1,3-diene, on a carbon black and on a crosslinking system is provided. The carbon black content ranges from 20 phr to 40 phr, the volume fraction of carbon black ranges from 8% to 15%, the copolymer content ranges from 20 phr to less than 50 phr, the natural rubber content is greater than 50 phr, and the copolymer contains more than 50 mol % of ethylene. Such a composition exhibits an improved compromise between the properties of cohesion, stiffness, hysteresis and resistance to ozone. Such a composition is preferentially used in a tire sidewall.

A rubber composition for a torsional damper has (A) a minimum value of tan δ at −30° C. to 120° C. of 0.140 or more, (B) a ratio of tan δ at −30° C. to tan δ at 60° C. of 3.5 or less, and (C) a ratio of E′ at −30° C. to E′ at 60° C. of 21 or less.

A rubber composition for a torsional damper has (A) a minimum value of tan δ at −30° C. to 120° C. of 0.140 or more, (B) a ratio of tan δ at −30° C. to tan δ at 60° C. of 3.5 or less, and (C) a ratio of E′ at −30° C. to E′ at 60° C. of 21 or less.

A tire comprises a rubber composition based on at least one elastomeric matrix mainly comprising a random copolymer comprising ethylene units and conjugated diene units, the mole fraction of the ethylene units in the copolymer being within a range extending from 50% to 95%; a peroxide; and a specific polyfunctional acrylate derivative.

An object of the present disclosure is to provide a copolymer excellent in fracture resistance, ozone resistance and wear resistance. In order to achieve the object, the present disclosure provides a copolymer containing at least an ethylene unit, a C.sub.4-10 non-conjugated olefin unit and a conjugated diene unit, wherein a content of 3,4 or 1,2-vinyl bond in the conjugated diene unit is equal to or larger than 30 mol %.

An object of the present disclosure is to provide a copolymer excellent in fracture resistance, ozone resistance and wear resistance. In order to achieve the object, the present disclosure provides a copolymer containing at least an ethylene unit, a C.sub.4-10 non-conjugated olefin unit and a conjugated diene unit, wherein a content of 3,4 or 1,2-vinyl bond in the conjugated diene unit is equal to or larger than 30 mol %.