The present invention relates to a pipe comprising an ethylene-based polymer, wherein the ethylene-based polymer: ⋅ comprises ≥0.10 mol % of units derived from 1-hexene, with regard to the total molar quantity of polymeric units of the ethylene-based polymer; ⋅ has an M.sub.w/M.sub.n as determined in accordance with ASTM D6474 (2012) of ≥2.5 and ≤4.0, preferably of ≥2.5 and ≤3.4; ⋅ has a density as determined in accordance with ASTM D792 (2008) of ≥925 and ≤945 kg/m.sup.3; and ⋅ in the molecular weight range of log(M.sub.w) between 4.0 and 5.5, has a comonomer branch content of between 2 and 15 comonomer-derived branches per 1000 carbon atoms in the polymer, as determined via .sup.13C NMR. Such pipe provides a desirably high long-term strength, as demonstrated by its high strain hardening modulus, as well as desirably high impact strength, as demonstrated by its high Charpy impact strength. Further, such pipe may be compliant with the PE-RT requirements of ISO 22391-1 (2009). For example, such pipe may be used for containing water at temperatures in the range of 40° C. to 80°.

Disclosed is a curly fiber having a fiber centroid and comprising a first region having a first centroid and a second region wherein the first region comprises an ethylene/alpha olefin interpolymer composition in an amount of at least 75 weight percent based on total weight of the first region and wherein the ethylene/alpha olefin interpolymer composition is characterized by a low temperature peak and a high temperature peak on an elution profile via improved comonomer composition distribution (ICCD) procedure, and a full width at half maximum of the high temperature peak is less than 6.0° C. and the second region is a material comprising a polymer which is different from the ethylene/alpha-olefin interpolymer of the first region and wherein the regions are arranged such that at least one of the first centroid and the second centroid is not the same as the fiber centroid.

Disclosed is a curly fiber having a fiber centroid and comprising a first region having a first centroid and a second region wherein the first region comprises an ethylene/alpha olefin interpolymer composition in an amount of at least 75 weight percent based on total weight of the first region and wherein the ethylene/alpha olefin interpolymer composition is characterized by a low temperature peak and a high temperature peak on an elution profile via improved comonomer composition distribution (ICCD) procedure, and a full width at half maximum of the high temperature peak is less than 6.0° C. and the second region is a material comprising a polymer which is different from the ethylene/alpha-olefin interpolymer of the first region and wherein the regions are arranged such that at least one of the first centroid and the second centroid is not the same as the fiber centroid.

A process for the preparation of a copolymer of propylene and ethylene comprising polymerising propylene and ethylene in the gas phase in the presence of a solid particulate catalyst free from an external carrier comprising: (i) a symmetrical complex of formula (I), wherein M is zirconium or hafnium; each X is a sigma ligand; L is a divalent bridge selected from —R′.sub.2C—, —R′.sub.2C—CR′.sub.2—, —R′.sub.2Si—, —R′.sub.2Si—SiR′.sub.2—, —R′.sub.2Ge—, wherein each R′ is independently a hydrogen atom, C1-C20-alkyi, tri(C1-C20-aikyl)silyl, C6-C20-aryl, C7-C20-arylalkyl or C7-C20-alkylaryl; R.sup.2 is a C1-C20 hydrocarbyl radical; m is 2 to 5; R.sup.9 is a H or C1-C20 hydrocarbyl radical; R.sup.7 is a hydrogen atom or a C.sub.1-10-hydrocarbyl radical; n is 0 to 3; R.sup.1 is a C1-C20 hydrocarbyl radical and optionally two adjacent R.sup.1 groups taken together can form a further mono or multicyclic ring condensed to Ph ring optionally substituted by one or two groups R.sup.4; and R.sup.4 is a C1-C10 alkyl radical; and (ii) a cocatalyst, preferably comprising an organometallic compound of a Group 13 metal; wherein the xylene soluble fraction of the propylene ethylene copolymer has an ethylene content of at least 10 wt % and an intrinsic viscosity of at least 1.2 dl/g.

##STR00001##

Ethylene copolymers made in the gas phase using a phosphinimine based single site catalyst supported on a passivated inorganic oxide support. The ethylene copolymers have a relatively narrow molecular weight distribution and good rheological parameters.

Ethylene copolymers made in the gas phase using a phosphinimine based single site catalyst supported on a passivated inorganic oxide support. The ethylene copolymers have a relatively narrow molecular weight distribution and good rheological parameters.

A process for the preparation of ethylene α-olefin copolymers by copolymerizing ethylene with α-olefins in the presence of a catalyst formed by contacting a metallocene complex with a cocatalyst, wherein the metallocene complex is a metallocene complex according to formula I or a metallocene complex according to formula II,

##STR00001##

wherein M is chosen from the group of Ti, Zr and Hf; Q is halogen (F, Cl, Br, I) or an alkyl group comprising 1 to 20 carbon atoms; k is the number of Q groups, is an integer and equals the valence of M minus 2; and wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are identical or different and can be chosen from alkyl groups with 1-20 carbon atoms.

A process for the preparation of ethylene α-olefin copolymers by copolymerizing ethylene with α-olefins in the presence of a catalyst formed by contacting a metallocene complex with a cocatalyst, wherein the metallocene complex is a metallocene complex according to formula I or a metallocene complex according to formula II,

##STR00001##

wherein M is chosen from the group of Ti, Zr and Hf; Q is halogen (F, Cl, Br, I) or an alkyl group comprising 1 to 20 carbon atoms; k is the number of Q groups, is an integer and equals the valence of M minus 2; and wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are identical or different and can be chosen from alkyl groups with 1-20 carbon atoms.

Low molecular weight, highly branched polyolefins are provided. Also provided are catalyst-mediated methods of making the low molecular weight, highly branched polyolefins and a catalyst system for carrying out the methods. The catalyst system is a homogeneous catalytic system that includes a single-site organozirconium complex and hydrocarbon-soluble perfluoroarylborate co-catalyst that is highly active for the oligomerization of olefin monomers in non-polar media.

Low molecular weight, highly branched polyolefins are provided. Also provided are catalyst-mediated methods of making the low molecular weight, highly branched polyolefins and a catalyst system for carrying out the methods. The catalyst system is a homogeneous catalytic system that includes a single-site organozirconium complex and hydrocarbon-soluble perfluoroarylborate co-catalyst that is highly active for the oligomerization of olefin monomers in non-polar media.