摘要:
The present invention relates to a ligand compound, an organic chromium compound, a catalyst system for ethylene oligomerization, a preparation method thereof, and an ethylene oligomerization method using the same. The catalyst system for ethylene oligomerization according to the present invention is used to prepare a low-density polyethylene in one reactor by using a small amount of comonomers such as alpha-olefin or by using only ethylene without comonomers, because it maintains high catalytic activity and high alpha-olefin selectivity even though supported on a support.
摘要:
This invention relates to a novel metallocene compound, a catalyst composition including the same and a method of preparing olefin-based polymers using the same. The use of the novel metallocene compound as a catalyst for preparing olefin-based polymers enables synthesis of an olefin-based polymer having a low molcular weight and a wide molcular weight distribution.
摘要:
The present invention relates to a method for ethylene oligomerization. According so the method of the present invention, highly active ethylene oligomerization reaction is possible by using a catalyst system including a novel chromium compound exhibiting high activity for ethylene oligomerization reaction, and therefore, polyethylene can be prepared using a small amount of comonomers or using only ethylene without comonomers.
摘要:
The present description relates to olefin block copolymers having excellent elasticity and processability in conjunction with enhanced heat resistance, and to a preparation method thereof. The olefin block copolymers comprise a plurality of blocks or segments that comprise ethylene or propylene repeating units and α-olefin repeating units at different mole fractions from one another, wherein the block copolymer shows peaks at the 2&thetas; of 21.5±0.5° and 23.7±0.5° in a wide-angle x-ray diffraction (WAXD) pattern, and the peak ratio defined by (the peak area at 21.5±0.5°)/(the peak area at 23.7±0.5°) is no more than 3.0.
摘要:
The present invention relates to a hybrid supported metallocene catalyst and a method for preparing an olefin-based polymer using the same. More particularly, the present invention provides a hybrid supported metallocene catalyst comprising two different kinds of metallocene compounds, in which one kind of the metallocene compound is a transition metal compound coordinated with quinoline-based amido group-introduced monocyclopentadienyl ligand, and a method for preparing an olefin-based polymer using the same.
摘要:
The present description relates to olefin block copolymers having excellent elasticity and processability in conjunction with enhanced heat resistance, and to a preparation method thereof. The olefin block copolymers comprise a plurality of blocks or segments that comprise ethylene or propylene repeating units and α-olefin repeating units at different mole fractions from one another, wherein the block copolymer shows peaks at the 2&thetas; of 21.5±0.5° and 23.7±0.5° in a wide-angle x-ray diffraction (WAXD) pattern, and the peak ratio defined by (the peak area at 21.5±0.5°)/(the peak area at 23.7±0.5°) is no more than 3.0.