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.

This disclosure relates to rotomolded articles, having a wall structure, where the wall structure contains at least one layer containing an ethylene interpolymer product, or a blend containing an ethylene interpolymer product and an ethylene polymer, where the ethylene interpolymer product has a Dilution Index (Y.sub.d) greater than 0 and improved Environmental Stress Crack Resistance (ESCR). The ethylene interpolymer product has a melt index from about 0.5 to about 15 dg/minute, a density from about 0.930 to about 0.955 g/cm.sup.3, a polydispersity (M.sub.w/M.sub.n) from about 2 to about 6 and a CDBI.sub.50 from about 50% to about 98%. Further, the ethylene interpolymer products are a blend of at least two ethylene interpolymers; where one ethylene interpolymer is produced with a single-site catalyst formulation and at least one ethylene interpolymer is produced with a heterogeneous catalyst formulation.

This disclosure relates to rotomolded articles, having a wall structure, where the wall structure contains at least one layer containing an ethylene interpolymer product, or a blend containing an ethylene interpolymer product and an ethylene polymer, where the ethylene interpolymer product has a Dilution Index (Y.sub.d) greater than 0 and improved Environmental Stress Crack Resistance (ESCR). The ethylene interpolymer product has a melt index from about 0.5 to about 15 dg/minute, a density from about 0.930 to about 0.955 g/cm.sup.3, a polydispersity (M.sub.w/M.sub.n) from about 2 to about 6 and a CDBI.sub.50 from about 50% to about 98%. Further, the ethylene interpolymer products are a blend of at least two ethylene interpolymers; where one ethylene interpolymer is produced with a single-site catalyst formulation and at least one ethylene interpolymer is produced with a heterogeneous catalyst formulation.

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.

This disclosure relates to a continuous solution polymerization process wherein production rate is increased. Process solvent, ethylene, optional comonomers, optional hydrogen and a single site catalyst formulation are injected into a first reactor forming a first ethylene interpolymer. Process solvent, ethylene, optional comonomers, optional hydrogen and a heterogeneous catalyst formulation are injected into a second reactor forming a second ethylene interpolymer. The first and second reactors may be configured in series or parallel modes of operation. Optionally, a third ethylene interpolymer is formed in an optional third reactor, wherein an optional heterogeneous catalyst formulation may be employed. In a solution phase, the first, second and optional third ethylene interpolymers are combined, the catalyst is deactivated, the solution is passivated and following a phase separation process an ethylene interpolymer product is recovered.

This disclosure relates to a continuous solution polymerization process wherein production rate is increased. Process solvent, ethylene, optional comonomers, optional hydrogen and a single site catalyst formulation are injected into a first reactor forming a first ethylene interpolymer. Process solvent, ethylene, optional comonomers, optional hydrogen and a heterogeneous catalyst formulation are injected into a second reactor forming a second ethylene interpolymer. The first and second reactors may be configured in series or parallel modes of operation. Optionally, a third ethylene interpolymer is formed in an optional third reactor, wherein an optional heterogeneous catalyst formulation may be employed. In a solution phase, the first, second and optional third ethylene interpolymers are combined, the catalyst is deactivated, the solution is passivated and following a phase separation process an ethylene interpolymer product is recovered.

This disclosure relates to a continuous solution polymerization process where ethylene interpolymer products having an improved color index; for example, products having higher whiteness (Whiteness Index (WI)) and lower yellowness (Yellowness Index (YI)). Product color was improved by adjusting selected solution polymerization reaction conditions. The disclosed ethylene interpolymer products have improved color relative to comparative polyethylene compositions.

This disclosure relates to a continuous solution polymerization process where ethylene interpolymer products having an improved color index; for example, products having higher whiteness (Whiteness Index (WI)) and lower yellowness (Yellowness Index (YI)). Product color was improved by adjusting selected solution polymerization reaction conditions. The disclosed ethylene interpolymer products have improved color relative to comparative polyethylene compositions.