A method for producing a nitrile group-containing copolymer rubber including copolymerizing a monomer mixture containing an α,β-ethylenically unsaturated nitrile monomer and a conjugated diene monomer, in which the copolymer has a Mooney viscosity (ML1+4, 100° C.) in a range of 30 to 60 at a time point when a polymerization conversion rate is 60%, the copolymerization is carried out until the polymerization conversion rate reaches 85% or more, and the obtained nitrile group-containing copolymer rubber has a Mooney viscosity (ML1+4, 100° C.) of 85 to 150.

A method for producing a nitrile group-containing copolymer rubber including copolymerizing a monomer mixture containing an α,β-ethylenically unsaturated nitrile monomer and a conjugated diene monomer, in which the copolymer has a Mooney viscosity (ML1+4, 100° C.) in a range of 30 to 60 at a time point when a polymerization conversion rate is 60%, the copolymerization is carried out until the polymerization conversion rate reaches 85% or more, and the obtained nitrile group-containing copolymer rubber has a Mooney viscosity (ML1+4, 100° C.) of 85 to 150.

This invention relates a wax inhibitor for hydrocarbon oils comprising an esterified copolymer having repeating structural units derived from an esterified ethylenically unsaturated dicarboxylic acid and α-olefins having at least 18 carbon atoms, whereof at least 3 mol-% of the α-olefins have 30 or more carbon atoms, and wherein the ethylenically unsaturated dicarboxylic acid has been esterified with a mixture of alcohols comprising i) 70 to 97 mol-% of a saturated fatty alcohol having 18 to 24 carbon atoms and ii) 3 to 30 mol-% of an unsaturated alcohol having 16 to 24 carbon atoms.

This invention relates a wax inhibitor for hydrocarbon oils comprising an esterified copolymer having repeating structural units derived from an esterified ethylenically unsaturated dicarboxylic acid and α-olefins having at least 18 carbon atoms, whereof at least 3 mol-% of the α-olefins have 30 or more carbon atoms, and wherein the ethylenically unsaturated dicarboxylic acid has been esterified with a mixture of alcohols comprising i) 70 to 97 mol-% of a saturated fatty alcohol having 18 to 24 carbon atoms and ii) 3 to 30 mol-% of an unsaturated alcohol having 16 to 24 carbon atoms.

Embodiments of the disclosure include processes of polymerizing olefins. The process includes contacting ethylene and a (C.sub.3-C.sub.40)alpha-olefin comonomer in the presences of a catalyst system. The catalyst system comprises a procatalyst and a bimetallic activator complex. The bimetallic activator complex comprises an anion and a countercation, and the anion has a structure according to formula (I).

Embodiments of the disclosure include processes of polymerizing olefins. The process includes contacting ethylene and a (C.sub.3-C.sub.40)alpha-olefin comonomer in the presences of a catalyst system. The catalyst system comprises a procatalyst and a bimetallic activator complex. The bimetallic activator complex comprises an anion and a countercation, and the anion has a structure according to formula (I).

The heterogeneous procatalyst of this disclosure includes a titanium species; a hydrocarbon soluble transition metal compound having a structure M(OR.sup.1).sub.z; a chlorinating agent having a structure A(Cl).sub.x(R.sup.2).sub.3-x, and a magnesium chloride component. M of M(OR.sup.1).sub.z is a non-reducing transition metal other than titanium, the non-reducing transition metal being in an oxidation state of +2 or +3. Each R.sup.1 is independently (C.sub.1-C.sub.30)hydrocarbyl or —C(O)R.sup.11, where R.sup.11 is (C.sub.1-C.sub.30)hydrocarbyl. Subscript z of M(OR.sup.1).sub.z is 2 or 3. Each R.sup.1 and R.sup.11 may be optionally substituted with one or more than one halogen atoms, or one or more than one —Si(R.sup.S).sub.3, where each R.sup.S is (C.sub.1-C.sub.30)hydrocarbyl. A of A(Cl).sub.x(R.sup.2).sub.3-x is aluminum or boron; R.sup.2 is (C.sub.1-C.sub.30)hydrocarbyl; and x is 1, 2, or 3; and a magnesium chloride component.

The heterogeneous procatalyst of this disclosure includes a titanium species; a hydrocarbon soluble transition metal compound having a structure M(OR.sup.1).sub.z; a chlorinating agent having a structure A(Cl).sub.x(R.sup.2).sub.3-x, and a magnesium chloride component. M of M(OR.sup.1).sub.z is a non-reducing transition metal other than titanium, the non-reducing transition metal being in an oxidation state of +2 or +3. Each R.sup.1 is independently (C.sub.1-C.sub.30)hydrocarbyl or —C(O)R.sup.11, where R.sup.11 is (C.sub.1-C.sub.30)hydrocarbyl. Subscript z of M(OR.sup.1).sub.z is 2 or 3. Each R.sup.1 and R.sup.11 may be optionally substituted with one or more than one halogen atoms, or one or more than one —Si(R.sup.S).sub.3, where each R.sup.S is (C.sub.1-C.sub.30)hydrocarbyl. A of A(Cl).sub.x(R.sup.2).sub.3-x is aluminum or boron; R.sup.2 is (C.sub.1-C.sub.30)hydrocarbyl; and x is 1, 2, or 3; and a magnesium chloride component.

The present invention relates to an olefin-based polymer, which has (1) a density (d) ranging from 0.85 to 0.90 g/cc, (2) a melt index (MI, 190° C., 2.16 kg load conditions) ranging from 0.1 g/10 min to 15 g/10 min, (3) the density (d) and the melt temperature (Tm) satisfying Tm (° C.)=a×d−b of Equation 1 (2,350<a<2,500, and 1,900<b<2,100), and (4) a ratio (hardness/Tm) of the hardness (shore A) to the melt temperature (Tm) in a range of 1.0 to 1.3. The olefin-based polymer according to the present invention exhibits excellent anti-blocking properties due to having improved hardness as a low-density olefin-based polymer.

The present invention relates to an olefin-based polymer, which has (1) a density (d) ranging from 0.85 to 0.90 g/cc, (2) a melt index (MI, 190° C., 2.16 kg load conditions) ranging from 0.1 g/10 min to 15 g/10 min, (3) the density (d) and the melt temperature (Tm) satisfying Tm (° C.)=a×d−b of Equation 1 (2,350<a<2,500, and 1,900<b<2,100), and (4) a ratio (hardness/Tm) of the hardness (shore A) to the melt temperature (Tm) in a range of 1.0 to 1.3. The olefin-based polymer according to the present invention exhibits excellent anti-blocking properties due to having improved hardness as a low-density olefin-based polymer.