The present invention relates to a ligand compound, catalyst system for olefin oligomerization, and a method for oligomerizing olefins using the same. The catalyst system for olefin oligomerization according to the present invention exhibit selectivity to 1-hexene or 1-octene while having excellent catalytic activity, thus enabling more efficient preparation of alpha-olefins.

The present invention relates to a ligand compound, catalyst system for olefin oligomerization, and a method for oligomerizing olefins using the same. The catalyst system for olefin oligomerization according to the present invention exhibit selectivity to 1-hexene or 1-octene while having excellent catalytic activity, thus enabling more efficient preparation of alpha-olefins.

Provided are a hybrid supported catalyst system and a method of preparing a polyolefin using the same. The hybrid supported catalyst system according to the present invention may be used to perform oligomerization and copolymerization of olefin monomers in a single reactor at the same time with high efficiency without a separate process of preparing alpha-olefin. Therefore, costs for preparing or purchasing comonomers which are expensive raw materials may be reduced, thereby reducing the production cost of a final product.

Provided are a hybrid supported catalyst system and a method of preparing a polyolefin using the same. The hybrid supported catalyst system according to the present invention may be used to perform oligomerization and copolymerization of olefin monomers in a single reactor at the same time with high efficiency without a separate process of preparing alpha-olefin. Therefore, costs for preparing or purchasing comonomers which are expensive raw materials may be reduced, thereby reducing the production cost of a final product.

Provided are a catalyst composition and a method of oligomerizing olefins using the same. When the catalyst composition according to the present invention is used, oligomerization and copolymerization of olefin monomers may be performed in a single reactor at the same time with high efficiency without a separate process of preparing alpha-olefin. Therefore, costs for preparing or purchasing comonomers which are expensive raw materials may be reduced, thereby reducing the production cost of a final product. Contents of SCB (short chain branch) and LCB (long chain branch) in the polyolefin may be increased without separate feeding of comonomers, thereby producing high-quality linear low-density polyethylene.

Provided are a catalyst composition and a method of oligomerizing olefins using the same. When the catalyst composition according to the present invention is used, oligomerization and copolymerization of olefin monomers may be performed in a single reactor at the same time with high efficiency without a separate process of preparing alpha-olefin. Therefore, costs for preparing or purchasing comonomers which are expensive raw materials may be reduced, thereby reducing the production cost of a final product. Contents of SCB (short chain branch) and LCB (long chain branch) in the polyolefin may be increased without separate feeding of comonomers, thereby producing high-quality linear low-density polyethylene.

A process for the oligomerization, preferably the tetramerization, of ethylene to predominantly 1-hexene or 1-octene or mixtures of 1-hexene and 1-octene includes contacting ethylene with a catalyst under ethylene oligomerization conditions. The catalyst comprises a source of chromium, a diphosphine ligating compound, and optionally an activator. The diphosphine ligating compound includes at least one substituted aromatic ring bonded to a phosphorous atom. The substituted aromatic ring is substituted at a ring atom adjacent to the ring atom bonded to the respective phosphorous atom with a group Y, where Y is of the form AR.sup.EWG, A being O, S or NR.sup.5, where R.sup.5 is a hydrocarbyl, heterohydrocarbyl or organoheteryl group, and R.sup.EWG is an electron withdrawing group.

A process for the oligomerization, preferably the tetramerization, of ethylene to predominantly 1-hexene or 1-octene or mixtures of 1-hexene and 1-octene includes contacting ethylene with a catalyst under ethylene oligomerization conditions. The catalyst comprises a source of chromium, a diphosphine ligating compound, and optionally an activator. The diphosphine ligating compound includes at least one substituted aromatic ring bonded to a phosphorous atom. The substituted aromatic ring is substituted at a ring atom adjacent to the ring atom bonded to the respective phosphorous atom with a group Y, where Y is of the form AR.sup.EWG, A being O, S or NR.sup.5, where R.sup.5 is a hydrocarbyl, heterohydrocarbyl or organoheteryl group, and R.sup.EWG is an electron withdrawing group.

Provided are a ligand compound having Formula 1, which exhibits high catalytic activity while exhibiting high 1-hexene and 1-octene selectivity, thereby allowing ethylene oligomerization to be achieved with excellent efficiency, an organic chromium compound, a catalyst composition including the organic chromium compound, and a method for oligomerizing ethylene by using the same;

##STR00001## wherein all the variables are described herein.

Provided are a ligand compound having Formula 1, which exhibits high catalytic activity while exhibiting high 1-hexene and 1-octene selectivity, thereby allowing ethylene oligomerization to be achieved with excellent efficiency, an organic chromium compound, a catalyst composition including the organic chromium compound, and a method for oligomerizing ethylene by using the same;

##STR00001## wherein all the variables are described herein.