An elastomeric composition suitable for use in belts like transmission belts may comprise: from 5 to 100 phr of a propylene-α-olefin-diene (PEDM) terpolymer comprising 80 wt % to 97.5 wt % propylene, 2.5 wt % to 20 wt % a-olefin, and 0.5 wt % to 10 wt % diene, said wt % based on the weight of the PEDM terpolymer, and wherein the PEDM terpolymer has (a) Mooney viscosity (ML(1+4)) of 1 MU to 60 MU, (b) melt flow rate of 0.5 g/min to 100 g/min, and (c) a weight average molecular weight to n-average molecular weight (Mw/Mn) ratio of 1.5 to 3.0; and from 60 to 95 phr of an ethylene-based copolymer comprising 0 wt % to 95 wt % ethylene, 0 wt % to 10 wt % of one or more dienes, and 5 wt % to 60 wt % C3 to C12 α-olefin, said wt % based on the total weight of the ethylene-based copolymer.

A pressure-sensitive adhesive may comprise: about 18 wt % to about 90 wt % of a propylene-ethylene(-diene) (PE(D)M) copolymer; about 10 wt % to about 65 wt % of a tackifier; and 0 wt % to about 40 wt % of an oil. The PE(D)M copolymer may comprise: (a) about 60 wt % to about 99 wt % propylene, (b) about 1 wt % to about 40 wt % ethylene or a C4 to C22 alpha-olefin, and (c) 0 wt % to about 20 wt % diene, wherein the PE(D)M copolymer has a heat of fusion of about 15 J/g or less.

A pressure-sensitive adhesive may comprise: about 18 wt % to about 90 wt % of a propylene-ethylene(-diene) (PE(D)M) copolymer; about 10 wt % to about 65 wt % of a tackifier; and 0 wt % to about 40 wt % of an oil. The PE(D)M copolymer may comprise: (a) about 60 wt % to about 99 wt % propylene, (b) about 1 wt % to about 40 wt % ethylene or a C4 to C22 alpha-olefin, and (c) 0 wt % to about 20 wt % diene, wherein the PE(D)M copolymer has a heat of fusion of about 15 J/g or less.

A composition comprising a first composition and a second composition, and wherein the first composition comprises a first ethylene/alpha-olefin/nonconjugated polyene interpolymer and a second ethylene/alpha-olefin/nonconjugated polyene interpolymer; and wherein the second composition comprises a third ethylene/alpha-olefin/non-conjugated polyene interpolymer and a fourth ethylene/alpha-olefin/nonconjugated polyene interpolymer; and wherein the first composition has a Mooney Viscosity (ML(1+4), 125° C.)≥50, and a Rheology Parameter ((RR/Mn)×1000)≥0.50; wherein the second composition has a Mooney Viscosity (ML(1+4), 125° C.)<50, and a Rheology Parameter ((RR/Mn)×1000)≥0.60.

A composition comprising a first composition and a second composition, and wherein the first composition comprises a first ethylene/alpha-olefin/nonconjugated polyene interpolymer and a second ethylene/alpha-olefin/nonconjugated polyene interpolymer; and wherein the second composition comprises a third ethylene/alpha-olefin/non-conjugated polyene interpolymer and a fourth ethylene/alpha-olefin/nonconjugated polyene interpolymer; and wherein the first composition has a Mooney Viscosity (ML(1+4), 125° C.)≥50, and a Rheology Parameter ((RR/Mn)×1000)≥0.50; wherein the second composition has a Mooney Viscosity (ML(1+4), 125° C.)<50, and a Rheology Parameter ((RR/Mn)×1000)≥0.60.

The invention provides a composition comprising an interpolymer composition, and wherein the interpolymer composition comprises a first ethylene/alpha-olefin/nonconjugated polyene interpolymer; and a second ethylene/alpha-olefin/nonconjugated polyene interpolymer; and wherein the interpolymer composition has a Mooney Viscosity (ML(1+4), 125° C.) <50, and a Rheology Parameter, ((RR/Mn)×1000) ≥0.60.

The invention provides a composition comprising an interpolymer composition, and wherein the interpolymer composition comprises a first ethylene/alpha-olefin/nonconjugated polyene interpolymer; and a second ethylene/alpha-olefin/nonconjugated polyene interpolymer; and wherein the interpolymer composition has a Mooney Viscosity (ML(1+4), 125° C.) <50, and a Rheology Parameter, ((RR/Mn)×1000) ≥0.60.

The present disclosure provides methods for producing an olefin polymer by contacting a C.sub.3-C.sub.40 olefin and ethylene with a catalyst system including an activator and a metallocene catalyst compound comprising a substituted or unsubstituted tetrahydro-s-indacenyl group and obtaining a C.sub.3-C.sub.40 olefin-ethylene copolymer typically comprising from 0.5 to 43 wt % ethylene, and from 99.5 to 57 wt % C.sub.3 to C.sub.40 comonomer wherein the Tg of the terpolymer is from 0 to −60° C.

The present disclosure provides methods for producing an olefin polymer by contacting a C.sub.3-C.sub.40 olefin and ethylene with a catalyst system including an activator and a metallocene catalyst compound comprising a substituted or unsubstituted tetrahydro-s-indacenyl group and obtaining a C.sub.3-C.sub.40 olefin-ethylene copolymer typically comprising from 0.5 to 43 wt % ethylene, and from 99.5 to 57 wt % C.sub.3 to C.sub.40 comonomer wherein the Tg of the terpolymer is from 0 to −60° C.

An object of the present disclosure is to provide a polymer exhibiting reduced heat generation in a low strain region. To achieve the object, the present disclosure provides a multi-component copolymer, comprising a non-conjugated olefin unit, a conjugated diene unit, and an aromatic vinyl unit, characterized in that: a ratio [(C.sub.100-120/C.sub.0-1000)×100] of crystallinity (C.sub.100-120) derived from the non-conjugated olefin unit at 100-120° C. with respect to crystallinity (C.sub.0-100) derived from the non-conjugated olefin unit at 0-100° C., as measured by a differential scanning calorimeter (DSC), is 23% or less.