Processes of polymerizing olefin monomers using catalyst systems and catalysts systems that include a procatalyst having a structure according to formula (I):

Processes of polymerizing olefin monomers using catalyst systems and catalysts systems that include a procatalyst having a structure according to formula (I):

A polymerization process includes contacting an ethylene feed containing ethylene monomers with a catalyst feed containing a hafnium-based or zirconium-based single-site catalyst in a solution so as to polymerize the ethylene monomers into long-chain branched high density polyethylene having on average a long-chain branch/polymer chain less than 10 and greater than 0.25. A polymerization composition includes ethylene; a hafnium-based or zirconium-based single-site catalyst; and a long-chain branched high density polyethylene polymerization product, where the long-chain branched high density polyethylene has on average a long-chain branch/polymer chain less than 10 and greater than 0.25; and where at least one of the ethylene, the catalyst, and the product is in solution.

A polymerization process includes contacting an ethylene feed containing ethylene monomers with a catalyst feed containing a hafnium-based or zirconium-based single-site catalyst in a solution so as to polymerize the ethylene monomers into long-chain branched high density polyethylene having on average a long-chain branch/polymer chain less than 10 and greater than 0.25. A polymerization composition includes ethylene; a hafnium-based or zirconium-based single-site catalyst; and a long-chain branched high density polyethylene polymerization product, where the long-chain branched high density polyethylene has on average a long-chain branch/polymer chain less than 10 and greater than 0.25; and where at least one of the ethylene, the catalyst, and the product is in solution.

The present invention relates to an anionic polymerization initiator represented by Formula 1 below for producing a polyolefin-polystyrene block copolymer, an anionic polymerization initiator composition, and a production method therefor,

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wherein R.sub.1, and A are described herein.

The present invention relates to an anionic polymerization initiator represented by Formula 1 below for producing a polyolefin-polystyrene block copolymer, an anionic polymerization initiator composition, and a production method therefor,

##STR00001##

wherein R.sub.1, and A are described herein.

A curable composition includes an olefin-aromatic vinyl compound-aromatic polyene copolymer satisfying conditions (1) to (4) and an additive resin, which is at least one of a hydrocarbon-based elastomer, polyphenylene ether, olefin-aromatic vinyl compound-aromatic polyene copolymerized oligomer, and aromatic polyene-based resin. (1) The number average molecular weight of the copolymer is 5000 to 100000. (2) The aromatic vinyl compound monomer has 8 to 20 carbon atoms, and the content of the unit of the monomer is 0 to 70 mass %. (3) The aromatic polyene is selected from polyenes having 5 to 20 carbon atoms and a plurality of vinyl and/or vinylene groups in the molecule, and the content of the groups is 1.5 to 20 pieces per number average molecular weight. (4) The olefin is selected from olefins having 2 to 20 carbon atoms, and the total monomer units of the olefin, aromatic vinyl compound, and aromatic polyene is 100 mass %.

A curable composition includes an olefin-aromatic vinyl compound-aromatic polyene copolymer satisfying conditions (1) to (4) and an additive resin, which is at least one of a hydrocarbon-based elastomer, polyphenylene ether, olefin-aromatic vinyl compound-aromatic polyene copolymerized oligomer, and aromatic polyene-based resin. (1) The number average molecular weight of the copolymer is 5000 to 100000. (2) The aromatic vinyl compound monomer has 8 to 20 carbon atoms, and the content of the unit of the monomer is 0 to 70 mass %. (3) The aromatic polyene is selected from polyenes having 5 to 20 carbon atoms and a plurality of vinyl and/or vinylene groups in the molecule, and the content of the groups is 1.5 to 20 pieces per number average molecular weight. (4) The olefin is selected from olefins having 2 to 20 carbon atoms, and the total monomer units of the olefin, aromatic vinyl compound, and aromatic polyene is 100 mass %.

The present invention relates to a new multimodal ethylene copolymer (P), to the use of the copolymer in film applications and to a film comprising the copolymer of the invention.

The present invention relates to a new multimodal ethylene copolymer (P), to the use of the copolymer in film applications and to a film comprising the copolymer of the invention.