160 results about "Olefin polymerization" patented technology

Catalyst systems comprising a metal-ligand complex having a structure according to Formula (I): Y and Z are independently a monodentate or bidentate ligand selected from the group consisting of (C1−C30)hydrocarbyl, (C1−C30)heterohydrocarbyl, (C6-C30)aryl, (C3-C30)heteroaryl, halogen and –H. R1, R2, R3, and R4 are independently selected from the group consisting of (C1−C30)hydrocarbyl, (C1−C30)heterohydrocarbyl, (C6-C30)aryl, (C3-C30)heteroaryl, −ORC, −Si(RC)3, −Ge(RC)3, halogen, and –H; R5, R6, R7, and R8 are independently selected from the group consisting of (C1−C30)hydrocarbyl, (C1−C30)heterohydrocarbyl, (C6-C30)aryl, (C3-C30)heteroaryl, −ORC, −Si(RC)3, −Ge(RC)3, halogen, and –H; R9 and R10 are independently selected from the group consisting of (C1−C30)hydrocarbyl, (C1−C30)heterohydrocarbyl, (C6-C30)aryl, (C3-C30)heteroaryl, −ORC, −Si(RC)3, −Ge(RC)3, halogen, and –H; and each RC is independently selected from the group consisting of (C1−C30)hydrocarbyl, (C1−C30)heterohydrocarbyl, (C6-C30)aryl, (C3-C30)heteroaryl, and –H.

The invention provides an alpha-diimine ligand compound, an alpha-diimine nickel catalyst and a preparation method and application of the alpha-diimine ligand compound and the alpha-diimine nickel catalyst, and belongs to the technical field of organic synthesis. Wherein R1 is selected from hydrogen, methoxyl or tertiary butyl; r2 is selected from methyl, ethyl or isopropyl; and R3 is selected from hydrogen or methyl. The alpha-diimine nickel catalyst prepared by adopting the alpha-diimine ligand compound can catalyze olefin to carry out homopolymerization reaction or copolymerization reaction, so that not only is excellent catalytic performance shown, but also a polyolefin material obtained by catalyzing olefin monomer homopolymerization reaction has excellent elastic recovery performance; and the catalyst has certain application potential in olefin polymerization industry.

The application discloses a kind of high olefin dry dehydration bed regeneration and cryogenic recovery process, belong to chemical separation and purification technical field, the process includes six steps of bed emptying, cold inert medium purging, heating desorption, staged cryogenic condensation recovery, bed cooling, pressure charging standby in sequence, maximum recovery free olefin by pre-emptying and purging step, inhibit high temperature polymerization, core uses staged cryogenic condensation recovery process to olefin component in desorption gas is condensed and recovered gradually, the loss problem of olefin material direct discharge flare in traditional process is solved, effectively inhibit olefin polymerization, by pre-cold inert medium purging step, remove the free olefin remaining in bed, cooperate with desorption temperature control and oxygen-free inert atmosphere throughout, avoid the occurrence of olefin polymerization reaction under high temperature condition, prevent the damage of green oil generation to adsorbent and equipment.

The present disclosure relates to a solid component for producing an olefin polymerization catalyst, its production method, and its use. The solid component contains (i) a magnesium compound represented by the following formula (1), (ii) a Lewis base (LB), and (iii) optionally a metal component other than magnesium, where LB is a compound represented by the general formula (II) or an amide compound represented by the general formula (II'). The solid component produced in the present invention has a good particle morphology, and a catalyst produced by using the solid component as a support is less likely to be crushed and has better stereostructure orientation in olefin polymerization, particularly propylene polymerization or copolymerization. [Formula 1] JPEG2023546624000060.jpg41169

Catalyst systems comprising a metal-ligand complex having a structure according to Formula (I): where M is a metal chosen from scandium or yttrium; X is chosen from silicon or germanium; L is a monodentate or bidentate ligand selected from the group consisting of (C1−C30) hydrocarbyl, (C1−C30) heterohydrocarbyl, (C6−C30)aryl, (C3−C30) heteroaryl, halogen and –H; and Z is a Lewis base. R1, R2, R3, and R4 are independently selected from the group consisting of (C1−C30) hydrocarbyl, (C1−C30) heterohydrocarbyl, (C6−C30)aryl, (C3−C30) heteroaryl, −ORC, −Si(RC)3, −Ge(RC)3, halogen, and –H; R5, R6, R7, and R8 are independently selected from the group consisting of (C1−C30) hydrocarbyl, (C1−C30) heterohydrocarbyl, (C6−C30)aryl, (C3−C30) heteroaryl, −ORC, −Si(RC)3, −Ge(RC)3, halogen, and –H; R9 and R10 are independently selected from the group consisting of (C1−C30)hydrocarbyl, (C1−C30) heterohydrocarbyl, (C6−C30)aryl, (C3−C30) heteroaryl, −ORC, −Si(RC)3, −Ge(RC)3, halogen, and –H; and each RC is independently selected from the group consisting of (C1−C30) hydrocarbyl, (C1−C30) heterohydrocarbyl, (C6−C30)aryl, (C3−C30) heteroaryl, and –H.

The application discloses a method for preparing photoelectric dual-response sensing polymer materials with self-repairing performance by using commercial olefin precursors and functionalized polymers based on the method; the method directly copolymerizes flexible comonomers and vinyl aromatic hydrocarbon monomers, and under suitable polymerization conditions, the two monomers are polymerized in a random copolymerization manner to generate functional polymers with micro-phase separation characteristics; the above method provided by the application can upgrade the commercial olefin monomers to obtain self-repairing performance, optical and electrical sensing performance, the conversion efficiency is high, the process is simple, the functionalization upgrading of the olefin polymers lacking of functions can be fully realized, the cost can be significantly reduced, the environmental pollution and resource waste can be reduced, and the application range of the olefin materials is widened.

This invention provides a highly thermally stable, photoresponsive α-diimine nickel complex, its synthesis method, and its applications, aiming to develop novel olefin polymerization catalysts with both excellent thermal stability and photoresponsive properties. The core photoresponsive switch of this type of nickel complex is a rigid diphenylethylene derivative, which can achieve reversible photoisomerization of the E / Z configuration under 365 nm and 405 nm ultraviolet light irradiation: the E configuration has a relatively open coordination environment; after light irradiation, the Z configuration has a more compact spatial structure, which can form a dual regulatory mechanism: steric hindrance and potential metal-aryl π interactions. Due to this dual regulatory mechanism, the complex exhibits excellent thermal stability at 150 °C. o Even at high temperatures, it still maintains a high value of 0.8 × 10⁻⁶. 6 g·mol ‑1 ·h ‑1 The nickel complex of this invention exhibits enhanced catalytic activity and effectively inhibits chain transfer and chain walking reactions during high-temperature polymerization. By synergistically enhancing thermal stability through configurational tautomerism, and possessing both photoresponsive properties and high catalytic activity, it holds significant research value and broad application prospects in the precise synthesis of functionalized polyolefin materials.

This invention relates to a Ziegler-Natta catalyst for olefin polymerization and a method for producing polyolefins with excellent processability using the same. The Ziegler-Natta catalyst for olefin polymerization is characterized by its ability to produce polyolefins with excellent processability because it contains at least one external electron donor that satisfies a specific formula based on an alkoxysilane (silicate), thereby increasing the number of active sites of the titanium compound.

This invention discloses an internal electron donor for olefin polymerization, a main catalyst component, and a catalyst. The internal electron donor has the following structure: wherein R1 and R2 are the same or different, and each is independently selected from C2 to C3. 20 Straight-chain or branched alkyl groups, C3-C4 20 cycloalkyl, C6-C 20 aryl, C7~C 20 Aryl alkyl group; R3 and R4 may be the same or different, and each is independently selected from hydrogen atoms, C1 to C4. 20 Straight-chain or branched alkyl groups, C3-C 20 cycloalkyl, C6-C 20 aryl, C7~C 20 Aryl groups. This novel internal electron donor, a triether compound with a tetrahydrofuran backbone and a specific structure, can simultaneously improve the catalytic activity of the catalyst and the isotacticity of polypropylene.

The application relates to the technical field of olefin polymerization, and discloses an ether metal complex and a preparation method and application thereof. The structural formula of the ether metal complex is shown in formula (I): wherein R1, R2, R3 and R4 are each independently selected from one of hydrogen, C1-C10 alkyl and halogen; X is each selected from O or S; and M is selected from IVB group metal. The ether metal complex is applied to ethylene polymerization as a catalyst, has high reactivity, good thermal stability, shows extremely strong control performance on the molecular weight of polyethylene wax, and highly linear low-molecular-weight polyethylene is obtained. Formula (I)

This disclosure provides a method. In one embodiment, the method includes the step of preparing pellets of recycled spent material. The recycled spent material is formed from a multilayer structure comprising at least (i) a layer composed of an olefin polymer and (ii) an adhesive layer. The adhesive layer comprises a solvent-free polyurethane adhesive composition. The method includes the step of blending the pellets with an olefin polymer blend component to form a blended material. The method includes the step of forming an article from the blended material. This disclosure also provides an article produced by the method.

Forming a catalyst system in the absence of aromatic solvents may be desirable. Catalyst systems effective for olefin polymerization may comprise a support material, an aluminum oxane formed in situ on the support material from a trialkylaluminum compound and water in the absence of aromatic solvents such as toluene, and a metallocene with C1 symmetry and containing a Group 4 metal. To form the catalyst system, the support material can be slurried in an aliphatic hydrocarbon solvent in the presence of water and contacted with a trialkylaluminum compound to form a supported activator, and the supported activator can be contacted with a metallocene with C1 symmetry and containing a Group 4 metal.

A resin composition comprising: an olefin-based polymer (A) having a crosslinkable group; and a complex (B) comprising a metal atom and a ligand, wherein the content of the complex (B) is from 0.0001 to 5 parts by mass relative to 100 parts by mass of the olefin-based polymer (A).

A catalyst component for olefin polymerization, a preparation method therefor and a use thereof are provided. The catalyst component contains elemental magnesium, elemental titanium and an internal electron donor. The internal electron donor has a phosphate ester, and an α-cyanosuccinate and / or a substituted α-cyanosuccinate. A molar ratio of the phosphate ester to the elemental magnesium is 0.0002-0.002:1. When the catalyst is used for olefin polymerization, especially for propylene polymerization, the obtained polymer has the characteristics of a high Z+1 average molecular weight and a good balance of rigidity and toughness.

The application discloses a catalyst for high-density polyethylene film production and a preparation method thereof, and belongs to the technical field of olefin polymerization catalysts. The catalyst takes active magnesium chloride as a carrier, loads titanium tetrachloride active components, and adopts a specific complex internal electron donor system. (1) Tetrahydrofuran and cyclohexanone are added as pre-coordination regulators during the preparation of magnesium chloride alcohol compound; (2) the alcohol compound is dispersed in titanium tetrachloride by means of atomization spraying for low-temperature titanium loading; (3) specific combined siloxane compounds and aromatic carboxylic acid esters are added in stages during the gradient temperature rising process, and ethyl benzoate is added in batches; (4) selective passivation washing is carried out by using a toluene solution containing ethyl acetate in the washing stage. Through the synergistic effect of the four steps, the generation of super-high-activity Ti 3+ centers is selectively inhibited, and the number of polymer "fish eye" defects is greatly reduced.

This invention discloses a transparent polyethylene film with stable frictional properties and its preparation method. The film is prepared from the following raw materials: 100 parts by weight of linear low-density polyethylene, 0.025-0.055 parts by weight of a compounded opening agent, 0.05-0.20 parts by weight of a slip agent, and 0.05-0.20 parts by weight of an antioxidant. The compounded opening agent is obtained by compounding silane-modified silica with a cyclic olefin polymer, and the mass ratio of silica to cyclic olefin polymer is 1:1 to 6:1. The slip agent is erucamide, and the melt flow rate of the cyclic olefin polymer at 230°C and 2.16 kg is 3 g / 10 min to 10 g / 10 min. By using two compounded opening agents, this invention significantly reduces the amount of silica used compared to the prior art using silica alone. At the same addition amount, it exhibits better opening and transparency compared to the prior art, and also has good friction coefficient stability.

A solid catalyst component for olefin polymerization includes magnesium, titanium, a halogen, a poly(α-olefin), and an internal electron donor. A Ti2p spectrum obtained from XPS analysis of the solid catalyst component is subjected to peak separation by means of Gaussian-Lorentzian peak-separation fitting. The result of the peak separation shows that the spectrum peaks of the Ti2p3 / 2 orbit have at least three characteristic peaks at positions where an electron binding energy is 459.9-454.9 eV. The solid catalyst component, when used in olefin polymerization, has the characteristics of slow decay of activity with the increase of storage time and a low fine powder content of the resulting polymer.

The application discloses an olefin polymerization catalyst component, an olefin polymerization catalyst and application thereof. The olefin polymerization catalyst component comprises Mg, Ti, halogen, at least one internal electron donor a compound and at least one internal electron donor b compound. The internal electron donor a compound is selected from 2,6-dimethoxycarbonyl substituent-4-pyrone in a general formula (I), and the internal electron donor b compound is selected from a Lewis base compound. The catalyst component of the application can significantly improve the activity after being compounded with the Lewis base compound by taking 2,6-dimethoxycarbonyl substituent-4-pyrone as the internal electron donor. The catalyst can obtain high isotacticity of polypropylene, and even when no external electron donor is added, high isotacticity of polyolefin can still be obtained.

This catalyst for olefin polymerization includes: (I) a solid catalyst component for olefin polymerization that includes at least magnesium, titanium, a halogen, and an internal electron donating compound; (II) an organic aluminum compound; and (III) an external electron donating compound, said catalyst for olefin polymerization being characterized in that in the solid catalyst for olefin polymerization, at least one or more compounds selected from first internal electron donating compounds and one or more compounds selected from second internal electron donating compounds are present as the internal electron donating compound, and at least an alkoxysilane compound and one or more compounds selected from amino silane compounds are present as the external electron donating compound. The present invention is able to provide a catalyst for olefin polymerization with which it is possible to produce an olefin polymer having excellent melt flow properties and high stiffness with a small amount of hydrogen used, as well as a method for producing an olefin polymer using said catalyst for olefin polymerization.

The present invention provides a Ziegler–Natta catalyst for olefin polymerization, a method for producing a polyolefin, and a polyolefin resin, wherein the Ziegler–Natta catalyst for olefin polymerization includes: (i) a Ziegler–Natta pro-catalyst for olefin polymerization comprising a titanium compound represented by chemical formula 1, a magnesium compound represented by chemical formula 2, a first internal electron donor represented by chemical formula 3, and a second internal electron donor that is at least one selected from the group consisting of compounds represented by chemical formula 4 and chemical formula 5; (ii) an organoaluminum compound represented by chemical formula 6; and (iii) an external electron donor represented by chemical formula 7.

This invention relates to the field of olefin polymerization, and discloses a catalyst composition, an olefin polymerization method using the catalyst composition, and the application of the catalyst composition in olefin polymerization. The catalyst composition comprises: a) a monometallocene compound with the structure shown in formula (1), and b) a co-catalyst component; in formula (1), Cp' is a mono- or poly-substituted cyclopentadienyl or unsubstituted cyclopentadienyl group with 1-20 carbon atoms, a mono- or poly-substituted indenyl or unsubstituted indenyl group with 1-20 carbon atoms, or a mono- or poly-substituted fluorenyl or unsubstituted fluorenyl group with 1-20 carbon atoms; R 1 R 2 R 3 R 4 R 5 and R 6 Each of the following is a hydrocarbon group consisting independently of a hydrogen atom, a halogen atom, or 1-20 carbon atoms; X is a halogen atom. The catalyst composition of this invention has the advantages of high high-temperature catalytic activity, good copolymerization performance, and high molecular weight of the resulting polymer.

This invention relates to compounds according to Formula 1: wherein M is a metal atom selected from Hf, Ti, and Zr; X is a halogen, a C1-C4 alkyl moiety, or a benzyl moiety; R1 is a C1-C4 alkyl moiety; R2, R3, R4, R5, and R6 are each the same or different; R7 and R8 are each a C1-C4 alkyl moiety, preferably methyl, and preferably R7 and R8 are the same; and wherein R2, R3, R4, R5, and R6 are each individually selected from hydrogen, C1-C4 alkyl, methoxy, phenyl, benzyl, 2-phenylpropyl, 2,2'-diphenylethyl, 2,4,6-trimethylphenyl, 3,5-dimethylphenyl, 3,5-di-tert-butylphenyl, 9 H 9-Carbazole-9-yl, 9-Methyl-9 H -fluorene-9-yl and adamantyl. Such compounds allow for their use as catalysts in olefin polymerization with particularly high polymerization activity, achieving the desired high incorporation and high molecular weight of comonomers in olefin copolymerization reactions. (1)

A solid catalyst component for olefin polymerization comprises magnesium halide, a titanium compound having at least a Ti-halogen bond, and at least two electron donor compounds, one of which is selected from a specific class of 1,3-diethers, and the other of which is selected from diether organic compounds. The solid catalyst component exhibits high polymerization activity and stereospecificity even in the absence of an external donor.

This description provides titanium complexes containing 1) a cyclopentadienyl ligand; 2) an adamantyl-phosphinimine ligand; and 3) at least one activatable ligand. The use of the complex, in combination with an activator, as an olefin polymerization catalyst is demonstrated. The catalysts are effective for the copolymerization of ethylene with an alpha olefin (such as 1-butene, 1-hexene, or 1-octene) and enable the production of high molecular weight copolymers (Mw greater than 25,000) with high productivity under solution polymerization conditions.

This catalyst for olefin polymerization contains (I) a solid catalyst component for olefin polymerization that contains at least magnesium, titanium, a halogen, and an internal electron-donating compound, (II) an organoaluminum compound, and (III) an external electron-donating compound, the catalyst for olefin polymerization being characterized in that at least one or more compounds selected from first internal electron-donating compounds and one or more compounds selected from second internal electron-donating compounds are present in the catalyst for olefin polymerization as internal electron-donating compounds, and at least one or more compounds selected from alkoxysilane compounds and aminoalkoxysilane compounds are present in the catalyst for olefin polymerization as external electron-donating compounds. According to the present invention, it is possible to provide: a catalyst for olefin polymerization with which it is possible to produce an olefin polymer that has exceptional melt flow properties and high rigidity at low hydrogen usage; and a method for producing an olefin polymer using this catalyst for olefin polymerization.

Provided is a solid catalyst component for polymerization of an olefin comprising an internal electron-donating compound other than phthalate esters, capable of easily producing a polymer of an olefin with excellent flowability and high rigidity, and further capable of easily producing a copolymer having a practically sufficient block rate and flowability under excellent copolymerization activity. A solid catalyst component for polymerization of an olefin comprising: magnesium, titanium, halogen, and a succinic acid diester compound, wherein a content of the succinic acid diester compound in a total content of the components in terms of the solid content is 15.0% by mass or more, a ratio (S / T), represented by a content of the succinic acid diester compound (S) in the total content of the components to a content of the titanium (T) in the total content of the components, is 0.60 to 1.30 in a molar ratio, and a total pore volume of a diameter of 1 µm or less as measured by a mercury intrusion method is 0.3 to 1.0 cm3 / g, and a specific surface area is 200 m2 / g or more.

A preparation method to produce a Ziegler-Natta catalyst for olefin polymerization through treatment of MgCl2•xROH adduct with a transition metal halide in the presence of one or more urea compounds in combination with one or more internal electron donors is provided. The catalyst systems, according to present invention, are able to produce polypropylene polymers with higher stereo-regularity. The catalyst systems, according to present invention, are able to produce polypropylene polymers using a phthalate-free catalyst system, with an isotacticity that is equal to or higher than catalyst systems containing phthalate derivatives.

This invention belongs to the field of olefin polymerization technology, specifically relating to an olefin copolymer, particularly an ethylene-α-olefin random copolymer, and further disclosing its preparation method and application. The ethylene-α-olefin random copolymer of this invention provides a random copolymer composed of ethylene and α-olefins, especially α-olefins with 3 to 8 carbon atoms. During gradient temperature rinsing, the copolymer is leached at temperatures ranging from 25 to 40°C and 45 to 120°C, wherein the leached component accounts for 0.5 to 5 wt% of the mass within the 25 to 40°C temperature range. This copolymer can be used in photovoltaic film applications, exhibiting improved crosslinking and electrical insulation properties.