The present invention relates to a novel Group 4 transition metal compound, a method for preparing the compound, a catalyst composition comprising the compound, and a method for preparing a polyolefin comprising performing a polymerization reaction of olefin monomers, in the presence of the catalyst composition. Since the Group 4 transition metal compound of the present invention exhibits an excellent catalytic activity in polyolefin synthesis reactions, as well as having excellent thermal stability, it can be used for polyolefin synthesis reactions at high temperatures, and by changing the type of a central metal and ligand, the weight average molecular weight of synthesized polyolefins and the octene content in the polymer can be controlled. Therefore, it can be effectively used in polyolefin synthesis processes in which grades are controlled.

The present invention relates to a novel Group 4 transition metal compound, a method for preparing the compound, a catalyst composition comprising the compound, and a method for preparing a polyolefin comprising performing a polymerization reaction of olefin monomers, in the presence of the catalyst composition. Since the Group 4 transition metal compound of the present invention exhibits an excellent catalytic activity in polyolefin synthesis reactions, as well as having excellent thermal stability, it can be used for polyolefin synthesis reactions at high temperatures, and by changing the type of a central metal and ligand, the weight average molecular weight of synthesized polyolefins and the octene content in the polymer can be controlled. Therefore, it can be effectively used in polyolefin synthesis processes in which grades are controlled.

A statistical, cationic-functionalized norbornene copolymer is formed by a process including performing a vinyl addition polymerization in the presence of a metal catalyst of a first norbornene monomer substituted with a first alkyl group and at least a second norbornene monomer substituted with a second alkyl group, to form an intermediate norbornene copolymer. The second alkyl group includes a substituent which undergoes a substitution reaction with a precursor of a cationic group. The process further includes adding the precursor for the cationic group to the intermediate norbornene copolymer to form the cationic functionalized norbornene copolymer. The cationic group has a volume of 0.25 cm.sup.3/mol or greater (for example, a phosphonium group or an imidazolium group).

The purpose of the present invention is to provide a propylene-based block copolymer, the deposition thereof on the inner wall of the polymerization vessel having been sufficiently inhibited. The propylene-based block copolymer of the present invention has a flowability evaluation value of 40% or less, the value being calculated with the following equation wherein X (sec) is the number of seconds over which 100 g of the copolymer having ordinary temperature falls from a stainless-steel funnel having an inner diameter of 11.9 mm and Y (sec) is the number of seconds over which 100 g of the copolymer which has been held at 80° C. for 24 hours under a load of 10 kg falls from the funnel having an inner diameter of 11.9 mm.
Flowability evaluation value (%)={(Y/X)−1}×100.

A polypropylene composition made from or containing

a first polymer consisting of component (1) made from or containing a propylene homopolymer having an MFR of 80 to 300 and containing 97.5% by weight or more of xylene insolubles (XI), wherein XI of the propylene homopolymer has a Mw/Mn of 4 to 10; and component (2) made from or containing an ethylene/propylene copolymer containing 35 to 50% by weight of an ethylene-derived unit;
wherein the polypropylene composition has the following characteristics: 1) the relative proportions of component (2)/[component (1) and component (2)] is more than 30% by weight and not more than 50% by weight, 2) the intrinsic viscosity of xylene solubles (XSIV) of the first polymer is in the range of 1.5 to 4.0 dl/g, and 3) the MFR of the first polymer is in the range of 20 to 100 g/10 min.

This invention relates to polyolefin. More specifically, this invention relates to polyolefin that has small copolymer content, but exhibits excellent mechanical properties.

The present disclosure provides a process. In an embodiment, the process includes contacting ethylene and octene under polymerization conditions at a temperature greater than 125° C. with a catalyst system comprising (i) a first polymerization catalyst having the structure of Formula (III), a second polymerization catalyst having the structure of Formula (I), and (iii) a chain shuttling agent. The process includes forming an ethylene/octene multi-block copolymer having a normalized OOO triad content greater than 0.25. The present disclosure provides the resultant composition produced by the process. In an embodiment, the composition includes an ethylene/octene multi-block copolymer having a normalized OOO triad content greater than 0.25.

The present disclosure provides a process. In an embodiment, the process includes contacting ethylene and octene under polymerization conditions at a temperature greater than 125° C. with a catalyst system comprising (i) a first polymerization catalyst having the structure of Formula (III), a second polymerization catalyst having the structure of Formula (I), and (iii) a chain shuttling agent. The process includes forming an ethylene/octene multi-block copolymer having a normalized OOO triad content greater than 0.25. The present disclosure provides the resultant composition produced by the process. In an embodiment, the composition includes an ethylene/octene multi-block copolymer having a normalized OOO triad content greater than 0.25.

A main purpose of the present invention is to provide a multi-block copolymer composition having good elasticity and excellent stress relaxation properties, as well as small tension set. The present invention achieves the purpose by providing a multi-block copolymer composition obtained by a modification treatment, the composition including a block copolymer B formed by introducing a functional group capable of forming a non-covalent bond to a block copolymer A; wherein the block copolymer A includes a block copolymer A1 having a specific primary structure and a block copolymer A2 having a specific primary structure, and the mass ratio (A1/A2) of the block copolymer A1 and the block copolymer A2 is 100/0 to 50/50.

A main purpose of the present invention is to provide a multi-block copolymer composition having good elasticity and excellent stress relaxation properties, as well as small tension set. The present invention achieves the purpose by providing a multi-block copolymer composition obtained by a modification treatment, the composition including a block copolymer B formed by introducing a functional group capable of forming a non-covalent bond to a block copolymer A; wherein the block copolymer A includes a block copolymer A1 having a specific primary structure and a block copolymer A2 having a specific primary structure, and the mass ratio (A1/A2) of the block copolymer A1 and the block copolymer A2 is 100/0 to 50/50.