The present invention provides catalyst compositions including a Group 15 containing hafnium catalyst compound, mixed catalyst compositions including the Group 15 containing hafnium catalyst compound and a bulky ligand metallocene catalyst compound, unsupported and supported catalyst systems thereof, and a process for polymerizing olefin(s) utilizing them and polymers made therefrom.

Catalyst systems and their use in a polymerization process

The present invention relates to a process for the polymerization of monomers utilizing a bulky ligand hafnium transition metal metallocene-type catalyst compound, to the catalyst compound itself and to the catalyst compound in combination with an activator. The hafnocene comprises at least one cyclopentadienyl ligand including at least one linear or isoalkyl substituent of at least 3 carbon atoms.

Polymerization catalyst systems comprising substituted hafnocenes

The metallocene compound according to the invention and the olefin polymerization catalyst containing the compound are intended to produce a catalyst capable of preparing an isotactic polymer with a high polymerization activity. The metallocene compound contains a substituted cyclopentadienyl group and a (substituted) fluorenyl group and has a structure wherein these groups are bridged by a hydrocarbon group or the like. The process for preparing a metallocene compound according to the invention is intended to selectively prepare a specific metallocene compound so as not to produce an isomer, and in this process an intermediate product is synthesized by a specific method. The process for preparing a polyolefin according to the invention is intended to prepare a polyolefin having excellent impact resistance and transparency, and this process comprises homopolymerizing an α-olefin of 3 to 8 carbon atoms or copolymerizing an olefin of 3 to 8 carbon atoms and another α-olefin in the presence of an olefin polymerization catalyst containing the above-mentioned metallocene compound.

Metallocene compound, process for producing metallocene compound, olefin polymerization catalyst, process for producing polyolefin, and polyolefin

A polyethylene film having a balance of improved physical and mechanical properties and a method for making the same are provided. In one aspect, the film includes a 1% secant modulus of greater than 25,000 psi, a dart impact resistance of greater than 500 g/mil, and a MD tear strength of greater than 500 g/mil. In one aspect, the method comprises reacting ethylene derived units and a comonomer in the presence of a hafnium-based metallocene at a temperature of from 70° C. and 90° C., an ethylene partial pressure of from 120 psia and 260 psia, and a comonomer to ethylene ratio of from 0.01 to 0.02 to produce an ethylene based polymer. The method further comprises extruding the ethylene based polymer at conditions sufficient to produce a polyethylene film comprising a secant modulus of greater than 25,000 psi, a dart impact resistance of greater than 500 g/mil, and a MD tear strength of greater than 500 g/mil.

High tear films from hafnocene catalyzed polyethylenes

The present invention provides a polymerization process which is conducted by contacting an olefin monomer and at least one olefin comonomer in the presence of hydrogen and a metallocene-based catalyst composition. Polymers produced from the polymerization process are also provided, and these polymers have a reverse comonomer distribution, low levels of long chain branches, and a ratio of Mw/Mn from about 3 to about 6.

Process for producing broader molecular weight distribution polymers with a reverse comonomer distribution and low levels of long chain branches

The invention comprises an olefin polymerization process comprising contacting ethylene alone or with one or more olefinically unsaturated comonomers with a Group 3-6 metallocene catalyst compound comprising one π-bonded ring having a C 3 or greater hydrocarbyl, hydrocarbylsilyl or hydrocarbylgermyl substituent said substituent bonded to the ring through a primary carbon atom; and, where the compound contains two π-bonded rings, the total number of substituents on the rings is equal to a number from 3 to 10, said rings being asymmetrically substituted where the number of substituents is 3 or 4. The invention process is particularly suitable for preparing ethylene copolymers having an MIR less than about 35, while retaining narrow CD even at high comonomer incorporation rates, and with certain embodiments providing ethylene copolymers having improved melt strength with the low MIR.

Olefin polymerization process with alkyl-substituted metallocenes

A catalyst system including two or more metallocene catalysts and processes for using the same to produce polyolefin polymer compositions are provided. The polyolefin polymer compositions have a good balance of a melt index ratio and normalized melt strength.

Catalyst Systems and Processes for Using the Same

본 발명은, 에틸렌 유래 단위, 및 0.5∼20 중량% 범위의 C3 내지 C12 α-올레핀 유래 단위를 포함하며, 0.5∼20 g/10 분 범위의 I값, 5∼100 g/10 분 범위의 I값을 갖는, 필름에 유용한 폴리에틸렌을 제공하며, 상기 폴리에틸렌은 60∼100℃ 범위의 온도에서, 가교된 비스-시클로펜타디에닐 4족 금속 촉매, 가교되지 않은 비스-시클로펜타디에닐 4족 금속 촉매, 및 활성화제를, 에틸렌, 및 모든 단량체의 중량에 대해 0.1∼5 중량% 범위의 C3 내지 C12 α-올레핀과 합하는 것을 포함하는 공정으로부터 형성된다.

필름용의 브로드 오쏘고날 분포 메탈로센 폴리에틸렌

본 발명은 지지된 촉매 시스템 및 그의 사용 방법에 관한 것이다. 특히, 촉매 시스템은 가교된 하프늄 메탈로센 화합물, 비가교된 메탈로센 화합물, 지지체 물질 및 활성제를 포함한다. 촉매 시스템은 폴리올레핀을 제조하는 데 사용될 수 있다.

Lue Ching Tai

Papers

Olefin polymerization process with alkyl-substituted metallocenes

Catalyst Systems and Processes for Using the Same

필름용의 브로드 오쏘고날 분포 메탈로센 폴리에틸렌

지지된 촉매 시스템 및 그의 사용 방법