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KR-20260064600-A - TRANSITION METAL COMPOUND, AND CATALYSTIC COMPOSITION COMPRISING THE SAME

KR20260064600AKR 20260064600 AKR20260064600 AKR 20260064600AKR-20260064600-A

Abstract

The present invention relates to a transition metal compound of a novel structure and a catalyst composition containing the same, and when using the catalyst composition containing the transition metal compound of the present invention, olefin polymers can be manufactured with high productivity.

Inventors

  • 이윤진
  • 박근호
  • 이종철
  • 장재권
  • 조성미
  • 김지은
  • 정재영

Assignees

  • 주식회사 엘지화학

Dates

Publication Date
20260507
Application Date
20251029
Priority Date
20241031

Claims (12)

  1. Transition metal compound represented by the following chemical formula 1: [Chemical Formula 1] In the above chemical formula 1, M is Hf or Zr, and L is an alkyl group having 1 to 20 carbon atoms, and Y is an alkylene group having 2 to 40 carbon atoms or an arylene group having 6 to 20 carbon atoms, and R1 and R2 are each independently N( R31 )( R32 ) or an alkoxy group having 1 to 20 carbon atoms, and R3 and R4 are each independently hydrogen, an alkyl group having 1 to 20 carbon atoms, N( R33 )( R34 ), or a halogen, and R 5 to R 30 are each independently hydrogen, halogen, cyano group, amine group, alkyl group having 1 to 20 carbon atoms, aryl group having 6 to 20 carbon atoms, alkylaryl group having 7 to 40 carbon atoms, arylalkyl group having 7 to 40 carbon atoms, alkylsilyl group having 1 to 20 carbon atoms, or alkoxy group having 1 to 20 carbon atoms, and R 31 to R 34 are each independently an alkyl group having 1 to 20 carbon atoms, an alkylaryl group having 7 to 40 carbon atoms, an arylalkyl group having 7 to 40 carbon atoms, or a silylalkyl group having 1 to 20 carbon atoms.
  2. In claim 1, R1 and R2 are N( R31 )( R32 ), and R3 and R4 are transition metal compounds in which the halogens are present.
  3. In claim 2, A transition metal compound represented by the above chemical formula 1 is a transition metal compound represented by any one of the following chemical formulas 1-1 to 1-4: [Chemical Formula 1-1] [Chemical Formula 1-2] [Chemical Formula 1-3] [Chemical Formula 1-4] In the above chemical formulas 1-1 to 1-4, hexyl, dodecyl, and C12H25 are unbranched straight hydrocarbon chains .
  4. In claim 1, R1 and R2 are N( R31 )( R32 ), and R3 and R4 are transition metal compounds N( R33 )( R34 ).
  5. In claim 4, The transition metal compound represented by the above chemical formula 1 is a transition metal compound represented by the following chemical formula 1-5 or chemical formula 1-6: [Chemical Formula 1-5] [Chemical Formula 1-6] In the above chemical formulas 1-5 and 1-6, hexyl, dodecyl, and C12H25 are unbranched straight hydrocarbon chains .
  6. In claim 1, M is Hf, and R1 and R2 are transition metal compounds in which the alkoxy groups have 1 to 20 carbon atoms.
  7. In claim 6, A transition metal compound represented by the above chemical formula 1 is a transition metal compound represented by any one of the following chemical formulas 1-7 to 1-12: [Chemical Formula 1-7] [Chemical Formula 1-8] [Chemical Formula 1-9] [Chemical Formula 1-10] [Chemical Formula 1-11] [Chemical Formula 1-12] .
  8. A catalyst composition comprising the transition metal compound and co-catalyst of claim 1.
  9. In claim 8, A catalyst composition comprising one or more selected from the group consisting of compounds represented by the following chemical formulas 2 to 5, wherein the above co-catalyst: [Chemical Formula 2] -[Al(R 35 )-O] a - In the above chemical formula 2, R 35 is each independently a halogen group, a hydrocarbyl group having 1 to 20 carbon atoms, or a hydrocarbyl group having 1 to 20 carbon atoms substituted with a halogen group, and a is an integer greater than or equal to 2, and [Chemical Formula 3] E(R 36 ) 3 In the above chemical formula 3, E is aluminum or boron, and R 36 is each independently hydrogen, a halogen group, a hydrocarbyl group having 1 to 20 carbon atoms, or a hydrocarbyl group having 1 to 20 carbon atoms substituted with a halogen group, and [Chemical Formula 4] [Le-H] + [G(A) 4 ] - [Chemical Formula 5] [Le] + [G(A) 4 ] - In the above chemical formulas 4 and 5, Le is a neutral or cationic Lewis acid, and [Le-H] + is a Brønsted acid, and G is a Group 13 element, and A is each independently a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms or a substituted or unsubstituted aryl group having 6 to 20 carbon atoms, wherein, when the alkyl group or aryl group is substituted, the substituent is a halogen group, a hydrocarbyl group having 1 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, or an aryloxy group having 6 to 20 carbon atoms.
  10. A method for producing an olefin polymer comprising the step of polymerizing an olefin monomer in the presence of the catalyst composition of claim 8 or 9.
  11. In claim 10, A method for manufacturing an olefin polymer, wherein the above olefin polymer is an ethylene/alpha-olefin copolymer.
  12. In claim 11, A method for preparing an olefin polymer, wherein the alpha-olefin comprises one or more selected from the group consisting of propylene, 1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-heptene, 1-octene, 1-decene, 1-undecene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-eicocene, norbornene, norvonadiene, ethylidenenorbornene, phenylnorbornene, vinylnorbornene, dicyclopentadiene, 1,4-butadiene, 1,5-pentadiene, 1,6-hexadiene, styrene, alpha-methylstyrene, divinylbenzene, and 3-chloromethylstyrene.

Description

Transition metal compound and catalyst composition comprising the same The present invention relates to a transition metal compound of a novel structure and a catalyst composition containing the same. Generally, olefin polymers such as ethylene copolymers are useful polymer materials used as materials for blow molded products, extruded products, films, sheets, etc., and have been manufactured in the presence of a Ziegler-Natta catalyst system. The above-mentioned Ziegler-Natta catalyst is a heterogeneous catalyst used in systems where the phase of the reactant and the phase of the catalyst are not identical, such as liquid-phase reactant-solid catalyst systems. Such a Ziegler-Natta catalyst is composed of two components, typically consisting of transition metals such as titanium (Ti), vanadium (V), chromium (Cr), molybdenum (Mo), zirconium (Zr), halogen compounds (e.g., TiCl4), alkyllithium, and alkylaluminum. However, the above-mentioned Ziegler-Natta catalyst has a disadvantage in that it fails to overcome the limitations of a heterogeneous catalyst, as the concentration of active species relative to transition metal atoms is only a few percent to several tens of percent, and most transition metal atoms do not perform their functions. Recently, metallocene compounds have been attracting attention as next-generation catalysts capable of overcoming these disadvantages. The metallocene compounds are known to exhibit desirable polymerization activity in olefin polymerization as homogeneous catalysts containing group 4 metals. Most metallocene catalysts used in polymerization have group 4 metal elements such as titanium, zirconium, and hafnium (Hf) and supporting ligands as precursors, and consist of two aromatic pentatomic rings and two halogen compounds acting as leaving groups. Among these, the supporting ligands coordinating to the central metal are typically aromatic cyclopentadienyl groups. Although these metallocene catalysts are applied in various ways, such as in olefin polymerization processes, they have shown some limitations in catalytic activity (particularly in solution processes at temperatures above 100°C). For example, due to relatively fast end-terminating reactions (or chain-linking reactions) such as the beta-hydride elimination reaction, it is generally known that low molecular weight olefin polymers with a molecular weight (Mn) of 20,000 or less can be produced at temperatures above 100°C. Furthermore, it is known that the active species of metallocene catalysts tend to become deactivated at temperatures above 100°C. Therefore, in order to increase the applicability of metallocene catalysts, it is necessary to find a way to overcome the aforementioned limitations. Hereinafter, the present invention will be described in more detail to aid in understanding the invention. Terms and words used in the description and claims of the present invention shall not be interpreted as being limited to their ordinary or dictionary meanings, and shall be interpreted in a meaning and concept consistent with the technical spirit of the present invention, based on the principle that the inventor can appropriately define the concept of the terms to best describe his invention. The term “alkyl” as used herein means a straight-chain, cyclic, or branched hydrocarbon residue unless otherwise noted, and includes, but is not limited to, methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, t-butyl, n-pentyl, isopentyl, and hexyl. As used herein, the term “cycloalkyl” refers to a non-aromatic cyclic hydrocarbon radical composed of carbon atoms unless otherwise noted. “Cycloalkyl” includes, by non-limiting example, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, and cycloheptyl. As used herein, the term “aryl” refers, unless otherwise noted, to an optionally substituted benzene ring or to a ring system that may be formed by fusing one or more optional substituents. Exemplary optional substituents include a substituted C1-3 alkyl, substituted C2-3 alkenyl, substituted C2-3 alkynyl, heteroaryl, heterocyclic, aryl, alkoxy, aryloxy, aralkoxy, acyl, aroyl, heteroaroyl, acyloxy, aroyloxy, heteroaroyloxy, sulfanyl, sulfinyl, sulfonyl, aminosulfonyl, sulfonylamino, carboxyamide, aminocarbonyl, carboxy, oxo, hydroxy, mercapto, amino, nitro, cyano, halogen, or ureido. Such rings or ring systems may optionally be fused to aryl rings (e.g., benzene rings), carbon ring rings, or heterocyclic rings having one or more optional substituents. Examples of 'aryl' groups include, but are not limited to, phenyl, naphthyl, tetrahydronaphthyl, biphenyl, indanyl, anthracyl, or phenanthyl, and their substituted derivatives. In the present invention, “alkylaryl” means an aryl group substituted by the alkyl group. In the present invention, “arylalkyl” means an alkyl group substituted by the aryl group. In the present invention, “hydrocarbyl” means a monovalent hydrocarbon group having 1 to 20 carbon atoms, consisting only of carbon and hyd