摘要:
The present description relates to an olefin block copolymer with excellences in elasticity, heat resistance, and processability. The olefin block copolymer comprises a plurality of blocks or segments, each comprising an ethylene or propylene repeating unit and an ±-olefin repeating unit at different mole fractions. The olefin block copolymer comprises polymer chains containing 20 to 100 short-chain branches (SCBs) per 1,000 carbon atoms. A point where a first derivative of the number Y of the SCBs per 1,000 carbon atoms of each polymer chain with respect to the molecular weight X of the polymer chain is 0 exists between the minimum and maximum values of the molecular weight X.
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 ligand compound, a chromium compound, and a catalyst system including the same. The catalyst system including the ligand compound or chromium compound according to the present invention exhibits high catalytic activity in 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 invention is related to an olefin-based polymer and a fiber including the same. Specifically, the olefin-based polymer according to the present invention is characterized in that 1) the density is 0.94 ∼ 0.96 g/cm 3 , 2) the melt index (MI; 190°C. 2.16kg) is 0.1 - 1.5 g/10min, and 3) the polydisperse index (PDI; Mw/Mn) is 2 - 7, and the olefin-based polymer may be prepared by using a supported metallocene catalyst. The olefin-based polymer according to the present invention can prepare a fiber showing the characteristics of high drawing and high tenacity.
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.