A composition for use in forming a multi-block copolymer, said copolymer containing therein two or more segments or blocks differing in chemical or physical properties, a polymerization process using the same, and the resulting polymers, wherein the composition comprises the admixture or reaction product resulting from combining: (A) a first metal complex olefin polymerization catalyst, (B) a second metal complex olefin polymerization catalyst capable of preparing polymers differing in chemical or physical properties from the polymer prepared by catalyst (A) under equivalent polymerization conditions, and (C) a chain shuttling agent.

Catalyst composition comprising shuttling agent for ethylene multi-block copolymer formation

Embodiments of the invention provide a class of ethylene/α-olefin block interpolymers. The ethylene/α-olefin interpolymers are characterized by an average block index, ABI, which is greater than zero and up to about 1.0 and a molecular weight distribution, M w /M n , greater than about 1.3. Preferably, the block index is from about 0.2 to about 1. In addition or alternatively, the block ethylene/α-olefin interpolymer is characterized by having at least one fraction obtained by Temperature Rising Elution Fractionation (“TREF”), wherein the fraction has a block index greater than about 0.3 and up to about 1.0 and the ethylene/α-olefin interpolymer has a molecular weight distribution, M w /M n , greater than about 1.3.

Ethylene/alpha-olefins block interpolymers

This invention relates to polyolefin compositions. In particular, the invention pertains to elastic polymer compositions that can be more easily processed on cast film lines, extrusion lamination or coating lines. The compositions of the present invention preferably comprise an elastomeric polyolefin resin and a high pressure low density type resin.

Compositions of ethylene/alpha-olefin multi-block interpolymer for elastic films and laminates

The present invention relates to plasticized polyolefin compositions comprising a polyolefin and a non-functionalized hydrocarbon plasticizer.

Plasticized polyolefin compositions

Improved thermoplastic polymer blend compositions comprising an isotactic polypropylene component and an alpha-olefin and propylene copolymer component, said copolymer comprising crystallizable alpha-olefin sequences. In a preferred embodiment, improved thermoplastic polymer blends are provided comprising from about 35% to about 85% isotactic polypropylene and from about 30% to about 70% of an ethylene and propylene copolymer, wherein said copolymer comprises isotactically crystallizable propylene sequences and is predominately propylene. The resultant blends manifest unexpected compatibility characteristics, increased tensile strength, and improved process characteristics, e.g., a single melting point.

Propylene olefin copolymers

PROBLEM TO BE SOLVED: To obtain a stable polyolefin while suppressing the lowering of catalytic activity by polymerizing an olefin using a catalyst containing a specific metallocene compound. SOLUTION: (A) An olefin is polymerized in the presence of (B) a catalyst containing a metallocene compound essentially free from irradiation history with light of a (C5 H4-b R b )MeXY (Q is a bonding group crosslinking two conjugated 5-membered ring ligands, etc.; Me is a transition metal of the groups IV to VI of the periodic table; X and Y are each independently a 1-20C hydrocarbon group, a halogen etc.; 0<=a<=4; 0<=b<=4; etc.).

Production of polyolefin

We have found that the ketal compound, dipheny dimethoxy-methane(DPDMM), is useful for the stereospecific polymerization of propene. Kinetic studies are carried out on the reaction of DPDMM with alkylaluminium. The reaction rate and the reaction products are influenced by the reaction atmosphere. The stereospecificity of the polymer depends on the concentration of DPDMM at that time.

17. A New Electron Donor for the Stereospecific Polymerization of Propene

PURPOSE: To obtain the subject polymer having excellent compatibility, adhesivity and printability and useful for ink, etc., by modifying a polymer composed of a specific α-olefin, etc., having unsaturated bond at the terminal and having a specific triad fraction [mm] determined by 13 C-NMR. CONSTITUTION: An unsaturated polymer having an olefinic unsaturated bond at one terminal and having a triad fraction [mm] of ≥0.5 measured by 13 C-NMR is produced by polymerizing a 3-20C α-olefin (e.g. propylene) at 40°C for 4hr using a catalyst composed of ethylenebis(indenyl)zirconium dichloride and methyl alumoxane, etc. The unsaturated polymer is dissolved in a solvent (e.g. xylene), heated at 100°C under stirring, added with a mixture of formic acid and 30wt.% hydrogen peroxide solution, reacted for 2hr, neutralized with alcoholic NaOH and poured into a large amount of acetone to precipitate the objective hydroxyl- containing polymer modified with hydroxyl group introduced to the terminal olefinic unsaturated bond. COPYRIGHT: (C)1992,JPO&Japio

Polymer containing hydroxyl group

PROBLEM TO BE SOLVED: To provide a catalyst and a polymerization process which can permit the production of an ethylene polymer excellent in melt properties such as melt tension and swell, specially processability, in blow molding. SOLUTION: This catalyst for ethylene polymerization essentially comprises least one compound selected from among ion-exchanging layered compounds (1) (except silicates) and inorganic silicates (2) all of which have a water content of 3wt.% or below and prepared by treating with a group 4B to 6B transition metal compound having at least one conjugated five-membered ligand and a compound comprising at least one cation of a 4B-6B transition atom and one anion of a halogen atom, an inorganic acid or an organic acid, and a process for producing an ethylene polymer comprising using this catalyst is provided.

Catalyst for ethylene polymerization and production of ethylene polymer

PURPOSE: To obtain the title catalyst useful for suppressing the formation of polymer lumps and obtaining an olefin polymer of excellent particle properties in high yields by combining a specified solid catalyst component with an alkylaluminoxane. CONSTITUTION: The title catalyst is prepared by combining a solid catalyst component prepared by bringing a product of contact between a catalyst carrier having a hydroxy group and an element selected from among Si, Al and Mg [e.g. Mg(OH)Cl] and a halide compound of a transition metal of group IVb of the periodic table (e.g. TiCl 4 ) into contact with an organometallic compound comprising a compound having a conjugated five-membered ring and a metal of group Ia of the periodic table (e.g. sodium cyclopentadienide) with an alkylaluminoxane (e.g. methylaluminoxane). COPYRIGHT: (C)1992,JPO&Japio

Production of catalyst for olefin polymerization and olefin polymer

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