A metallocene complex of formula (I): each X is a sigma-ligand; in the group R.sub.2Si— at least one R is methyl or ethyl, and the other R is selected from methyl, ethyl, n-propyl, isopropyl, n-butyl or isobutyl, pentyl, hexyl, cyclohexyl and phenyl; each R.sup.1 independently is the same or can be different and are a CH.sub.2—R.sup.7 group, with R.sup.7 being H or linear or branched C.sub.1-6-alkyl group, C.sub.3-8 cycloalkyl group, or C.sub.6-10 aryl group; each R.sup.2 is independently a —CH═, —CY═, —CH.sub.2—, —CHY— or —CY.sub.2— group, wherein Y is a C.sub.1-6 hydrocarbyl group and where n is 2-6; each R.sup.3 and R.sup.4 are independently the same or can be different and are hydrogen, a linear or branched C.sub.1-6-alkyl group, a C.sub.7-20 arylalkyl, C.sub.7-20 alkylaryl group, C.sub.6-20 aryl group, or an —OY group, wherein Y is a is a C.sub.1-6 hydrocarbyl group; R.sup.5 is a linear or branched C.sub.1-6-alkyl group, C.sub.7-20 arylalkyl, C.sub.7-20 alkylaryl group or C.sub.6-20-aryl group; and R.sup.6 is a C(R.sup.8).sub.3 group, with R.sup.8 being a linear or branched C.sub.1-6 alkyl group; (A) wherein at least one R.sup.3 per phenyl group and at least one R.sup.4 is not hydrogen, and wherein at least one R.sup.3 per phenyl group and at least one R.sup.4 is hydrogen; or (B) wherein one R.sup.3 is an —OY group, wherein Y is a is a C.sub.1-6 hydrocarbyl group, in 4 position of each phenyl group and the two other R.sup.3 groups are tert-butyl groups; and/or (C) wherein one R.sup.4 is an —OY group, wherein Y is a is a C.sub.1-6 hydrocarbyl group, in 4-position of the phenyl ring and the two other R.sup.4 groups are tert-butyl groups.

##STR00001##

A metallocene complex of formula (I): each X is a sigma-ligand; in the group R.sub.2Si— at least one R is methyl or ethyl, and the other R is selected from methyl, ethyl, n-propyl, isopropyl, n-butyl or isobutyl, pentyl, hexyl, cyclohexyl and phenyl; each R.sup.1 independently is the same or can be different and are a CH.sub.2—R.sup.7 group, with R.sup.7 being H or linear or branched C.sub.1-6-alkyl group, C.sub.3-8 cycloalkyl group, or C.sub.6-10 aryl group; each R.sup.2 is independently a —CH═, —CY═, —CH.sub.2—, —CHY— or —CY.sub.2— group, wherein Y is a C.sub.1-6 hydrocarbyl group and where n is 2-6; each R.sup.3 and R.sup.4 are independently the same or can be different and are hydrogen, a linear or branched C.sub.1-6-alkyl group, a C.sub.7-20 arylalkyl, C.sub.7-20 alkylaryl group, C.sub.6-20 aryl group, or an —OY group, wherein Y is a is a C.sub.1-6 hydrocarbyl group; R.sup.5 is a linear or branched C.sub.1-6-alkyl group, C.sub.7-20 arylalkyl, C.sub.7-20 alkylaryl group or C.sub.6-20-aryl group; and R.sup.6 is a C(R.sup.8).sub.3 group, with R.sup.8 being a linear or branched C.sub.1-6 alkyl group; (A) wherein at least one R.sup.3 per phenyl group and at least one R.sup.4 is not hydrogen, and wherein at least one R.sup.3 per phenyl group and at least one R.sup.4 is hydrogen; or (B) wherein one R.sup.3 is an —OY group, wherein Y is a is a C.sub.1-6 hydrocarbyl group, in 4 position of each phenyl group and the two other R.sup.3 groups are tert-butyl groups; and/or (C) wherein one R.sup.4 is an —OY group, wherein Y is a is a C.sub.1-6 hydrocarbyl group, in 4-position of the phenyl ring and the two other R.sup.4 groups are tert-butyl groups.

##STR00001##

This invention relates bisindenyl metallocene catalyst compounds having long (at least 4 carbon atoms) linear alkyl groups substituted at the two position and substituted or unsubstituted aryl groups at the four position and process using such catalyst compounds, particularly in the solution process at higher temperatures.

This invention relates bisindenyl metallocene catalyst compounds having long (at least 4 carbon atoms) linear alkyl groups substituted at the two position and substituted or unsubstituted aryl groups at the four position and process using such catalyst compounds, particularly in the solution process at higher temperatures.

Embodiments are directed towards a use of a supported gas-phase biphenylphenol polymerization catalyst to make a polymer via a gas-phase polymerization process, wherein the supported gas-phase biphenylphenol polymerization catalyst is made from a gas-phase biphenylphenol polymerization precatalyst of Formula I.

Embodiments are directed towards a use of a supported gas-phase biphenylphenol polymerization catalyst to make a polymer via a gas-phase polymerization process, wherein the supported gas-phase biphenylphenol polymerization catalyst is made from a gas-phase biphenylphenol polymerization precatalyst of Formula I.

The present invention relates to an ultra-high molecular weight polyethylene (UHMWPE) powder having a BET specific surface area of ≥0.50 m.sup.2/g as determined in accordance with ISO 9277 (2010). Such UHMWPE powder allows for preparation of a gel solution comprising the powder to a desired swelling ratio at moderate temperatures within a reduced swelling period.

The present invention relates to an ultra-high molecular weight polyethylene (UHMWPE) powder having a BET specific surface area of ≥0.50 m.sup.2/g as determined in accordance with ISO 9277 (2010). Such UHMWPE powder allows for preparation of a gel solution comprising the powder to a desired swelling ratio at moderate temperatures within a reduced swelling period.

The present invention relates to compounds according to formula I, wherein: R1 is a cyclopentadienyl moiety or a moiety comprising a cyclopentadienyl ring structure; R2 is a moiety M(R5).sub.2 or MR5, wherein M is a metal selected from hafnium, titanium or zirconium, and R5 is F, Cl, I, Br or an alkyl-moiety comprising 1 to 10 carbon atoms, preferably methyl, benzyl, butadiene or pentadiene; R3 is H, an alkyl or aryl moiety comprising 1 to 10 carbon atoms, or a moiety comprising N or O and 1 to 15 carbon atoms; R4 is H, an alkyl or aryl moiety comprising 1 to 10 carbon atoms, or a moiety comprising N or O and 1 to 15 carbon atoms, or a halogen; wherein if R3 is H, R4 is a moiety other than H, and if R4 is H, R3 is a moiety other than H; each R6 is individually selected from H, a halogen, an alkyl moiety, an aryl moiety, a halogen-substituted alkyl moiety, a halogen-substitute d aryl moiety, an alkoxy moiety, a siloxy-moiety, or a nitrogen-containing moiety, preferably H. Such compounds may be used in a catalyst system for olefin polymerisation, particularly ethylene copolymerisation, providing at least one of a high catalyst activity, a high comonomer incorporation, and/or a high molecular weight polymer.

##STR00001##

The present invention relates to compounds according to formula I, wherein: R1 is a cyclopentadienyl moiety or a moiety comprising a cyclopentadienyl ring structure; R2 is a moiety M(R5).sub.2 or MR5, wherein M is a metal selected from hafnium, titanium or zirconium, and R5 is F, Cl, I, Br or an alkyl-moiety comprising 1 to 10 carbon atoms, preferably methyl, benzyl, butadiene or pentadiene; R3 is H, an alkyl or aryl moiety comprising 1 to 10 carbon atoms, or a moiety comprising N or O and 1 to 15 carbon atoms; R4 is H, an alkyl or aryl moiety comprising 1 to 10 carbon atoms, or a moiety comprising N or O and 1 to 15 carbon atoms, or a halogen; wherein if R3 is H, R4 is a moiety other than H, and if R4 is H, R3 is a moiety other than H; each R6 is individually selected from H, a halogen, an alkyl moiety, an aryl moiety, a halogen-substituted alkyl moiety, a halogen-substitute d aryl moiety, an alkoxy moiety, a siloxy-moiety, or a nitrogen-containing moiety, preferably H. Such compounds may be used in a catalyst system for olefin polymerisation, particularly ethylene copolymerisation, providing at least one of a high catalyst activity, a high comonomer incorporation, and/or a high molecular weight polymer.

##STR00001##