摘要:
In accordance with the present invention, there is provided a transition metal olefin polymerization catalyst component characterized by the formula: where, M is a Group IV or a Group IV transition metal, B is a bridge group containing at least two carbon atoms, A′ and A″ are organogroups, each containing a heteroatom selected from the group consisting of oxygen, sulfur, nitrogen and phosphorus, X is selected from the group consisting of chlorine, bromine, iodine, a C1-C20 alkyl group, a C6-C30 aromatic group and mixtures thereof, and n is 1, 2 or 3. The invention also encompasses a method for the polymerization of an ethylenically unsaturated monomer which comprises contacting a transition metal catalyst component as characterized by formula (1) above and an activating co-catalyst component in a polymerization reaction zone with an ethylenically unsaturated monomer under polymerization conditions to produce a polymer product.
摘要:
Supported stereospecific catalysts and processes for the stereotactic propagation of a polymer chain derived from ethylenically unsaturated monomers which contain three or more carbon atoms or which are substituted vinyl compounds, specifically alpha olefins, particularly the polymerization of propylene to produce syndiotactic or isotactic polypropylene. The supported metallocene catalyst comprises a stereospecific metallocene catalyst and a co-catalyst component comprising at least one of an alkyl alumoxane and an alkylaluminum compound. Both the metallocene catalyst and the co-catalyst are supported on a particulate silica support comprising silica particles having an average particle size of 5-40 microns and an average effective pore size of 50-200 angstroms. The silica support further has a differential pore size distribution of a pore volume of at least 0.01 cm3/g. within a range having a maximum pore width of no more than 300 angstroms. The metallocene has a retention factor on this support of at least 90 wt. % after aging in tri-isobutylaluminum at a temperature of 25° C. for a period of 12 hours.
摘要:
Bidentate catalyst systems and the methods or forming such are described herein. The catalyst systems generally are compounds having the general formula: where R, R1, R2 and R3 are optional and independently selected from hydrogen, C1 to C20 alkyl groups or C6 to C20 aryl groups, A′ and A″ are independently selected from coordination groups, M is a Group 4 or 5 transition metal, X is selected from halogens, alkyl groups, aromatic groups or combinations thereof and n is less than 4.
摘要:
Catalyst systems, polymers and methods of forming the same are described herein. The catalyst systems generally include an inorganic support material having a bonding sequence selected from Si—O—Al—F, F—Si—O—Al, F—Si—O—Al—F and combinations thereof, wherein the inorganic support material has an acid strength (pKa) of less than about 4.8 and a transition metal compound, wherein the transition metal compound is represented by the formula [L]mM[A]n; wherein L is a bulky ligand, A is a leaving group, M is a transition metal and m and n are such that a total ligand valency corresponds to a transition metal valency.
摘要翻译:催化剂体系,聚合物及其形成方法在本文中描述。 催化剂体系通常包括具有选自Si-O-Al-F,F-Si-O-Al,F-Si-O-Al-F及其组合的键合顺序的无机载体材料,其中无机载体材料具有 小于约4.8的酸强度(pKa)和过渡金属化合物,其中过渡金属化合物由式[L]表示:M [A] n < ; 其中L是大体积配体,A是离去基团,M是过渡金属,m和n使总配体的价态对应于过渡金属的价态。
摘要:
Polymer compositions and articles formed therefrom are described herein. The compositions include a random copolymer and a radiation additive, wherein the random copolymer includes propylene and less than 2 wt. % ethylene and exhibits a melt flow rate of from about 30 to 100 dg/min., the polymer composition exhibits a flexural modulus of from about 160 kpsi to about 200 kpsi and the polymer composition is adapted to produce a polymer article exhibiting low plate out, a haze at 20 mils of no greater than 15%, radiation stability and autoclavability.
摘要:
Catalyst compositions having Cs symmetry and processes utilizing Cs symmetric catalyst components for the polymerization of ethylenically unsaturated monomers to produce polymers, including copolymers or homopolymers. Monomers, which are polymerized or copolymerized include ethylene, C3+ alpha olefins and substituted vinyl compounds, such as styrene and vinyl chloride. The catalyst component is characterized by the formula: wherein M is a Group 4-11 transition metal, n is an integer of from 1-3, Q is halogen or a C1-C2 alkyl group, PY is a pyridinyl group, R′ and R″ are each C1-C20 hydrocarbyl group, A1 is a mononuclear aromatic group, and A2 is a polynuclear aromatic group, such as a terphenyl group. The catalyst component is used with an activating co-catalyst component such as an alumoxane. Also disclosed is a process for the preparation of a pyridinyl-linked bis-amino ligand suitable for use in forming the catalyst component.
摘要:
Supported catalyst systems and methods of forming the same are described herein. In one specific embodiment, the methods generally include providing an inorganic support material and contacting the inorganic support material with an aluminum fluoride compound represented by the formula AlFpX3-pBq to form an aluminum fluoride impregnated support, wherein X is selected from Cl, Br and OH−, B is H2O, p is selected from 1 to 3 and q is selected from 0 to 6. The method further includes contacting the aluminum fluoride impregnated support with a transition metal compound to form a supported catalyst system, wherein the transition metal compound is represented by the formula [L]mM[A]n; wherein L is a bulky ligand, A is a leaving group, M is a transition metal and m and n are such that a total ligand valency corresponds to the transition metal valency.
摘要:
Supported catalyst systems and methods of forming polyolefins are generally described herein. The polymerization methods generally include introducing an inorganic support material to a reaction zone, wherein the inorganic support material includes a bonding sequence selected from Si—O—Al—F, F—Si—O—Al, F—Si—O—Al—F and combinations thereof, introducing a transition metal compound to the reaction zone and contacting the transition metal compound with the inorganic support material for in situ activation/heterogenization of the transition metal compound to form a catalyst system. The method further includes introducing an olefin monomer to the reaction zone and contacting the catalyst system with the olefin monomer to form a polyolefin.
摘要:
Supported catalyst systems and methods of forming the same are generally described herein. The methods generally include providing an inorganic support composition, wherein the inorganic support composition includes a bonding sequence selected from Si—O—Al—F, F—Si—O—Al, F—Si—O—Al—F and combinations thereof and contacting the inorganic support composition with a transition metal compound to form a supported catalyst system, wherein the transition metal compound is represented by the formula [L]mM[A]n; wherein L is a bulky ligand, A is a leaving group, M is a transition metal and m and n are such that a total ligand valency corresponds to the transition metal valency.
摘要翻译:载体催化剂体系及其形成方法一般在此描述。 所述方法通常包括提供无机载体组合物,其中所述无机载体组合物包括选自Si-O-Al-F,F-Si-O-Al,F-Si-O-Al-F及其组合的键合序列, 使无机载体组合物与过渡金属化合物接触以形成负载型催化剂体系,其中过渡金属化合物由式[L] M [A] ; 其中L是大体积配体,A是离去基团,M是过渡金属,m和n使总配体的化合价对应于过渡金属的价态。
摘要:
Catalyst systems and methods of forming the same are described herein. The catalyst system may be formed by contacting an alumina-silica support composition with ammonium bifluoride in the presence of water to form a first fluorinated support composition. The method then includes heating the first fluorinated support composition in an oxygen containing atmosphere to a temperature of from about 200° C. to about 600° C. to form a second fluorinated support composition, wherein the second fluorinated support composition includes a bonding sequence selected from Si—O—Al—F, F—Si—O—Al, F—Si—O—Al—F and combinations thereof and then contacting the second fluorinated support composition with a transition metal compound to form a supported catalyst system, wherein the transition metal compound is represented by the formula [L]mM[A]n; wherein L is a bulky ligand, A is a leaving group, M is a transition metal and m and n are such that a total ligand valency corresponds to the transition metal valency.
摘要翻译:本文描述了催化剂体系及其形成方法。 催化剂体系可以通过在水的存在下使氧化铝 - 二氧化硅载体组合物与二氟化铵反应形成第一氟化支撑组合物而形成。 该方法然后包括将含氧气氛中的第一氟化载体组合物加热至约200℃至约600℃的温度以形成第二氟化载体组合物,其中第二氟化载体组合物包含选择的键合顺序 从Si-O-Al-F,F-Si-O-Al,F-Si-O-Al-F及其组合,然后使第二氟化支撑组合物与过渡金属化合物接触以形成负载型催化剂体系,其中 过渡金属化合物由式[L] M [A] n N表示; 其中L是大体积配体,A是离去基团,M是过渡金属,m和n使总配体的化合价对应于过渡金属的价态。