Disclosed are catalyst compositions having an internal electron donor which includes a 3,6-di-substituted-1,2-phenylene aromatic diester. Ziegler-Natta catalyst compositions containing the present catalyst compositions exhibit very high hydrogen response, high activity, high selectivity and produce propylene-based olefins with high melt flow rate.

Disclosed are catalyst compositions having an internal electron donor which includes a 3,6-di-substituted-1,2-phenylene aromatic diester. Ziegler-Natta catalyst compositions containing the present catalyst compositions exhibit very high hydrogen response, high activity, high selectivity and produce propylene-based olefins with high melt flow rate.

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##

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##

The present invention relates to a novel group 4 transition metal compound, a method for preparing the compound, a catalyst composition containing the compound, and a method for preparing a polyolefin, comprising a step for forming a polymerization reaction of olefin monomers in the presence of the catalyst composition. The group 4 transition metal compound of the present invention exhibits an excellent catalytic activity and has excellent thermal stability in a polyolefin synthesis reaction, and thus can be used even in a polyolefin synthesis reaction at a high temperature. In addition, the compound of the present invention can be advantageously used in the synthesis process of grade-controlled polyolefin since the weight average molecular weight of the synthesized polyolefin and the octane content in the polymer can be adjusted by varying the kinds of center metal and ligand.

Propylene random copolymers with low randomness and being free of from catalyst originating phthalates.

The present invention relates to a two-component composition suitable for providing a coating preparation from which a cured layer can be obtained in order to protect the surface of materials against the detrimental impact of weathering and/or corrosion. The two-component composition comprises a first component C1 comprising (a) a polyolefin having a polymer backbone consisting of (a-i) repeating units derived from an olefinically unsaturated monomer having 4 carbon atoms and, optionally, (a-ii) a hydrocarbon group L having 5-20 carbon atoms in a non-terminal position of said polymer backbone, wherein said polymer backbone has functional groups selected from hydroxyl groups and amine groups at its chain ends; and (C2) a second component comprising a preparation comprising (b1) a polyisocyanate having 2 or more isocyanate groups and/or (b2) a reaction product having isocyanate groups obtained by reacting said polyisocyanate having 2 or more isocyanate groups (b1) and (b2a) a polyolefin having a polymer backbone consisting of (b2a-i) repeating units derived from an olefinically unsaturated monomer having 4 carbon atoms and, optionally, (b2a-ii) a hydrocarbon group having 5-20 carbon atoms in a non-terminal position of said polymer backbone, wherein said polymer chain has functional groups selected from hydroxyl groups and amine groups at its chain ends.

The present invention relates to a two-component composition suitable for providing a coating preparation from which a cured layer can be obtained in order to protect the surface of materials against the detrimental impact of weathering and/or corrosion. The two-component composition comprises a first component C1 comprising (a) a polyolefin having a polymer backbone consisting of (a-i) repeating units derived from an olefinically unsaturated monomer having 4 carbon atoms and, optionally, (a-ii) a hydrocarbon group L having 5-20 carbon atoms in a non-terminal position of said polymer backbone, wherein said polymer backbone has functional groups selected from hydroxyl groups and amine groups at its chain ends; and (C2) a second component comprising a preparation comprising (b1) a polyisocyanate having 2 or more isocyanate groups and/or (b2) a reaction product having isocyanate groups obtained by reacting said polyisocyanate having 2 or more isocyanate groups (b1) and (b2a) a polyolefin having a polymer backbone consisting of (b2a-i) repeating units derived from an olefinically unsaturated monomer having 4 carbon atoms and, optionally, (b2a-ii) a hydrocarbon group having 5-20 carbon atoms in a non-terminal position of said polymer backbone, wherein said polymer chain has functional groups selected from hydroxyl groups and amine groups at its chain ends.

Disclosed are catalyst compositions having an internal electron donor which includes a 3,6-di-substituted-1,2-phenylene aromatic diester. Ziegler-Natta catalyst compositions containing the present catalyst compositions exhibit very high hydrogen response, high activity, high selectivity and produce propylene-based olefins with high melt flow rate.

Disclosed are catalyst compositions having an internal electron donor which includes a 3,6-di-substituted-1,2-phenylene aromatic diester. Ziegler-Natta catalyst compositions containing the present catalyst compositions exhibit very high hydrogen response, high activity, high selectivity and produce propylene-based olefins with high melt flow rate.