A heterophasic polypropylene copolymer having an MFR2 of 0.05 to 20 g/10 min (ISO 1133 at 230° C. with a loading of 2.16 kg) and a melting point (Tm) of 156 to 164° C. (measured by DSC according to ISO 11357) wherein the heterophasic polypropylene copolymer comprises at least the following components: (A) 55.0 to 95.0 wt % of a crystalline fraction (CF) having a comonomer content of 0 to 3.0 wt %; and (B) 5.0 to 45.0 wt % of a soluble fraction (SF) having a comonomer content of 12 to 45 wt %; wherein the intrinsic viscosity (IV) (in decalin at 135° C.) of the soluble fraction (SF) is 2.5 to 11 dl/g, and wherein the amount of crystalline fraction (CF) and the amount of soluble fraction (SF) are determined in 1,2,4-trichlorobenzene at 40° C.

A borate compound-composition may contain soluble in hydrocarbon solvents and useful as a cocatalyst for solution polymerization of olefins or dienes. A composition containing a compound of formula (1)

##STR00001##

and
a compound of formula (4):

##STR00002##

wherein each symbol is as defined in the specification, which is useful as a cocatalyst for polymerization of olefins or dienes, and a production method thereof can be provided.

The present disclosure relates to a method for preparing a polyolefin using a supported hybrid metallocene catalyst. According to the present disclosure, a polyolefin having a narrow molecular weight distribution can be prepared very effectively by introducing a cocatalyst in an optimum content in the presence of a supported hybrid metallocene catalyst containing two or more metallocene compounds having a specific chemical structure. The polyolefin prepared according to the present disclosure exhibits excellent uniformity in chlorine distribution in polyolefin during chlorination, thereby significantly improving elongation of the chlorinated polyolefin, compatibility with PVC and impact reinforcing performance. Thus, it exhibits excellent chemical resistance, weather resistance, flame retardancy, processability and impact strength reinforcing effect, and can be suitably applied as an impact reinforcing agent for PVC pipes and window profiles.

The present disclosure relates to an ethylene/1-hexene copolymer having excellent flexibility and processability and useful for manufacturing high-pressure heating pipes, PE-RT pipes or large-diameter pipes.

A process for the synthesis of a granular polymer, the process comprising (a) providing an active polymerization mixture that includes polymer, monomer, catalyst and optional solvent; (b) introducing a hydroxy-containing diaryl acetyl compound to the active polymerization mixture to thereby provide an inactive polymer mixture; (c) separating the polymer solution into a first stream and a second stream, where the first stream includes the polymer and the hydroxy-containing diaryl acetyl compound, and the second stream includes the monomer and the optional solvent; and (d) fabricating granules from the first stream.

A metallocene compound having a structure shown by formula (I). A functional group connected to a bridging atom of the metallocene compound is an amine-substituted group and/or a metallocene-substituted group and/or a substituted metallocene group. A metallocene catalyst containing the metallocene compound has high catalytic activity, and can synthesize metallocene polypropylene having high isotacticity.

R.sup.IR.sup.IIZ(Cp.sup.III).sub.n(E).sub.2-nML.sup.IVL.sup.V   (I)

Activators may comprise compounds represented by the Formula [Ar(EHR.sup.1R.sup.2)(OR.sup.3)]d+[M.sup.k+Q.sub.n].sup.d, wherein: Ar is an aryl group; E is nitrogen or phosphorous; R.sup.1 is a C.sub.1-C.sub.30, optionally substituted, linear alkyl group; R.sup.2 is a C.sub.1-C.sub.30, optionally substituted, linear alkyl group; R.sup.3 is a C.sub.10-C.sub.30, optionally substituted, linear alkyl group; M is an element selected from group 13 of the Periodic Table of the Elements; d is 1, 2 or 3; k is 1, 2, or 3; n is 1, 2, 3, 4, 5, or 6; n−k=d; and each Q is independently hydride, bridged or unbridged dialkylamido, halide, alkoxide, aryloxide, hydrocarbyl, substituted hydrocarbyl, halocarbyl, substituted halocarbyl, or halosubstituted-hydrocarbyl radical. Catalysts systems may comprise these activators and methods of preparing polyolefins may use these catalysts systems.

Embodiments of the present disclosure are directed towards catalyst formulations including a metallocene and a stearic compound selected from bis 2-hydroxyethyl stearyl amine, aluminum distearate, and combinations thereof, where the metallocene is represented by the following formula: (Formula (I)) wherein each n-PR is n-propyl, and each X is independently CH.sub.3, Cl, or F. ##STR00001##

A catalyst compound and process for olefin polymerization. The catalyst can be represented by Formula (I):

##STR00001##

wherein: M is a transition metal selected from group 3, 4, or 5 of the Periodic Table of Elements; L is a linking group selected from any one or more difunctional C.sub.1-C.sub.20 hydrocarbyl, aryl or substituted aryl groups; T is an optional bridging group; each X is a univalent anionic ligand, or two Xs are joined and bound to the metal atom to form a metallocycle ring, or two Xs are joined to form a chelating ligand, a diene ligand, or an alkylidene ligand; R.sup.1 and R.sup.2 are each independently a hydrogen atom or substituted or unsubstituted C.sub.1 to C.sub.20 hydrocarbyl group; R.sup.3, R.sup.5, R.sup.6 and R.sup.7 are each independently a hydrogen atom or a substituted or unsubstituted C.sub.1 to C.sub.20 hydrocarbyl group, and, optionally, any two of R.sup.5, R.sup.6, and R.sup.7 can be joined to form a cyclic structure; R.sup.4 is a substituted or unsubstituted aryl group; and R.sup.8, R.sup.9, R.sup.10, and R.sup.11 are each independently a substituted or unsubstituted C.sub.1 to C.sub.6 hydrocarbyl group and, optionally, R.sup.9 and R.sup.10 are joined to form a cyclic structure.

The present disclosure relates to a polyethylene, which is reacted with chlorine to prepare a chlorinated polyethylene having improved tensile strength and excellent processability during extrusion by optimizing a low molecular region in a molecular structure, and a CPE compound including the same.