1019 results about "Olefin polymerization" patented technology

The invention belongs to the field of olefin polymers, and relates to a reversible cross-linked polyolefin elastomer and a preparation method thereof. The reversible cross-linked polyolefin elastomer is a reversible cross-linked polyolefin elastomer in which a cross-linked network is formed through three non-covalent bonds, namely hydrogen bonds, ionic bonds and coordinate bonds, and the hydrogen bonds and the cross-linked bonds account for 0.1-85% by taking the sum of the three non-covalent bonds, namely the hydrogen bonds, the ionic bonds and the coordinate bonds as 100%; the ionic crosslinking bond accounts for 0.5-90%; and the coordination crosslinking bond accounts for 9-99%. Compared with a reversible cross-linked polyolefin elastomer in the prior art, the reversible cross-linked polyolefin elastomer prepared by the invention contains hydrogen bonds, ionic bonds and coordinate bonds at the same time, and a synergistic effect is generated through combination of reversible cross-linked interaction of the coordinate bonds, the hydrogen bonds and the ionic bonds; therefore, the material has excellent physical and mechanical properties and also has recoverability and self-repairability.

The purposes of the present invention is: to provide an adhesive composition which has excellent adhesive force and holding properties in addition to excellent low dielectric properties; to provide an adhesive tape which has an adhesive layer that contains the adhesive composition; to provide a resin molded body which is molded from a resin composition that comprises the adhesive composition; to provide a composite structure which comprises the adhesive tape; to provide an automobile member which comprises the resin molded body or the composite structure; and to provide a method for producing a resin molded body using the composite structure.　The present invention provides an adhesive composition which contains: an acrylic copolymer that has a constituent unit derived from a (meth)acrylic acid alkyl ester, a constituent unit derived from an olefin-based polymer that has a polymerizable unsaturated double bond at an end thereof, and a constituent unit derived from a polar functional group-containing monomer; and a styrene-based elastomer that contains at least one substance selected from the group consisting of a block copolymer which has a block derived from a styrene-based monomer and a block derived from a conjugated diene-based monomer, and a hydrogenated product of the block copolymer.

The invention relates to the technical field of catalytic synthesis, in particular to a preparation method and polymerization application of a carbon nanotube-based double-cyclopentadienyl bridged metallocene catalyst, and the preparation method comprises the following steps: 1, acidizing a carbon nanotube; 2, dispersing the acidified carbon nanotubes in a methylaluminoxane solution in a nitrogen or inert gas atmosphere to obtain an acidified carbon nanotube dispersion liquid; and 3, mixing the double-cyclopentadienyl bridged metal compound solution with the acidified carbon nanotube dispersion liquid for reaction. According to the invention, the carbon nanotubes are added into an olefin polymerization reaction system in the form of a double-metallocene bridged metallocene catalyst carrier, so that the tensile strength and toughness of polyolefin are improved while olefin polymerization reaction is catalyzed with high catalytic activity.

The invention discloses a batch processing technology of micro-fluidic chips, and relates to the technical field of chip processing. The method comprises the following steps: firstly, providing at least two layers of polymer coiled materials, namely a first coiled material for forming a micro-channel structure and a second coiled material for closing a micro-channel, the coiled materials are continuous coiled materials selected from polyethylene glycol terephthalate (PET), cycloolefin polymer (COP), polycarbonate (PC) or polymethyl methacrylate (PMMA), and the coiled materials are continuous coiled materials selected from polyethylene glycol terephthalate (PET), cycloolefin polymer (COP), polycarbonate (PC) or polymethyl methacrylate (PMMA); the thickness of the coiled material is 50-500 microns; secondly, carrying out continuous compression molding processing on the surface of the first coiled material through a roll-to-roll processing platform; through a roll-to-roll continuous process, micro-channel mold pressing, functional deposition, precise alignment bonding and online cutting are integrated, high-efficiency, high-consistency and high-integration-level batch manufacturing of the micro-fluidic chip is realized, and manual intervention and production cost are remarkably reduced.

It is intended to provide a method for producing a catalyst for olefin polymerization which exhibits excellent catalytic activity in a polymerization treatment and permits production of a polymer excellent in stereoregularity, melt flowability, etc., even when the polymerization catalyst is prepared in an inert gas atmosphere by using a solid catalytic component comprising an electron-donating compound other than a phthalic acid ester. The method for producing a catalyst for olefin polymerization comprises performing a pre-contact treatment of bringing a solid catalytic component (A) comprising a magnesium atom, a titanium atom, a halogen atom and an electron-donating compound having no phthalic acid ester structure, a specific organoaluminum compound (B) and an external electron-donating compound (C) into contact with each other at a temperature of lower than 15° C. for a time of 30 minutes or shorter in the absence of the olefin.

The invention discloses a method for producing multimodal polyethylene through series connection of multiple reactors, and belongs to the field of olefin polymerization. The low-molecular-weight or medium-molecular-weight ethylene polymer is produced through polymerization in the first reactor, the obtained product enters the intermediate treatment unit to remove hydrogen, and then part of the product is shunted to enter the second reactor to be mixed with the ultra-high-molecular-weight ethylene polymer produced through ethylene polymerization in the second reactor; all polymers of the second reactor are returned to the intermediate treatment unit, and the rest products after hydrogen removal enter a third reactor and are mixed with high-molecular-weight ethylene polymers generated by copolymerization of ethylene and comonomers in the third reactor to generate multimodal polyethylene. The multimodal polyethylene produced by the method is wide in molecular weight distribution, and the molecular weight of ultra-high molecular weight polyethylene is flexible to regulate and control. According to the invention, material circulation between the third reactor and the second reactor is adopted, molecular chain-level mixing among the components is achieved, the compatibility is good, and the mechanical property is more excellent.

Embodiments provide bimodal polymerization catalyst systems comprising metallocene olefin polymerization catalysts and biphenylphenol polymerization catalysts made from biphenylphenol polymerization precatalysts of Formula I.

The invention discloses a polyolefin catalyst, a preparation method thereof and an olefin polymerization method. R1 and R8 are selected from hydrogen atoms and respectively meet the following conditions: 6.0 ppm < = delta1 < = 6.8 ppm, 6.0 ppm < = delta8 < = 6.8 ppm, and delta1 and delta8 are respectively chemical shifts of R1 and R8 in hydrogen spectrum nuclear magnetism of the catalyst. The catalyst can catalyze copolymerization of ethylene / alpha-olefin with high activity.

The invention provides an organic boron salt olefin polymerization cocatalyst as well as a preparation method and application thereof, and belongs to the technical field of olefin polymerization catalysts. The organic boron salt olefin polymerization promoter provided by the invention has a structure as shown in a formula I. In the formula I, Ct < + > is a cation capable of enabling a metal alkyl chain to be subjected to alkyl elimination, and R1 is independently selected from carbon or silicon atoms; r2, R3 and R4 are independently selected from hydrogen, alkyl or phenyl respectively; the organic boron salt olefin polymerization cocatalyst provided by the invention is mainly used in olefin polymerization reaction. Compared with a traditional perfluorotetraphenylboron promoter [Ct] + [B (C6F4-R-p) 4]-, the organic boron promoter [Ct] + [B (C6F4-R-p) 4]-has better solubility in non-polar straight-chain alkane and cycloalkane, metallocene and non-metallocene main catalysts can be efficiently activated, a more loose anion-cation pair polymerization active center is formed, and olefin coordination and polymerization are facilitated. And the formula I of the # imgabs0 # is shown in the specification.

The invention discloses an oxide-enhanced, high-strength and high-temperature-resistant diaphragm and a preparation method thereof, and belongs to the technical field of battery diaphragms. The diaphragm is of a three-layer co-extrusion structure, a surface layer is composed of a block olefin polymer and a styrene elastomer, the block olefin polymer comprises soft chain segment polyethylene and hard chain segment polyolefin containing rigid groups, the styrene elastomer is a block copolymer with an (S) m-(P / B) n-(S) m microphase separation structure, and the thickness of the styrene elastomer is 1-10 micrometers. And the middle layer consists of high-density polyethylene and hydrophobically modified oxide. The preparation method comprises the following steps: synthesis of the block olefin polymer, three-layer co-extrusion sheet casting, two-way stretching, extraction drying, secondary transverse stretching and heat setting. Through molecular structure design and multiphase compounding, the mechanical strength, the membrane rupture temperature and the thermal stability of the diaphragm are synergistically improved, meanwhile, good electrolyte wettability and processing consistency are kept, the problems that a traditional wet-process diaphragm is poor in temperature resistance and insufficient in strength are effectively solved, and the safety of a lithium battery is remarkably improved.

A process for the continuous production of a polyolefin polymer in a gas-phase polymerization reactor in the presence of a polymerization catalyst and an antistatic agent, including the steps of (a) providing a mixture of polyolefin particles and gas, (b) conveying the mixture through a pipe at a gas velocity of greater than or equal to 2 m / s, and (c) introducing an antistatic agent into the mixture.

In general, a foamed antioxidant masterbatch is disclosed. The foamed antioxidant masterbatch comprises an olefin polymer and one or more organic phosphite antioxidants. The foamed antioxidant masterbatch comprises a cell structure comprising one or more cells. The one or more organic phosphite antioxidants is provided in the one or more cells. The present disclosure is also directed to a method of making a foamed antioxidant masterbatch using a foaming agent and a method of making a polymer composition from the foamed antioxidant masterbatch and a second polymer.

The invention provides an olefin polymer composition and application thereof, and relates to the technical field of composite materials. The olefin polymer composition is prepared from the following raw material components in parts by weight: 100 parts of an olefin polymer, 0.5 to 5 parts of an anthraquinone compound and 1 to 5 parts of aspartic ester resin, the structure of the aspartic ester resin contains C8-C24 alkylene and a polyethylene glycol chain segment. The olefin polymer composition has good hydrophilicity, and the treatment effect of the olefin polymer composition on nitrogen-containing sewage can be improved.

The present application relates to the technical field of olefin polymerization, and in particular to an ethylene / α-olefin copolymer and an application thereof, and a packaging adhesive film composition. The ethylene / α-olefin copolymer has the following characteristics: (a) the melting peak temperature measured by means of a differential scanning calorimeter (DSC) is 30-90°C, and the melting range width measured by means of the DSC is 75-90°C; and (b) dH(90) and dH(100) continuously measured by using the DSC and from nucleation / annealing (SSA), wherein 0≤dH(90)≤2J / g, and dH(100)=0. The ethylene / α-olefin copolymer of the present application has specific property characteristics, and when the polymer is used in an adhesive film processing process, a high degree of crosslinking is still maintained while the mixing time of the polymer and an auxiliary agent is shortened.

Sulfated bentonite compositions are characterized by a total pore volume from 0.4 to 1 mL / g, a total BET surface area from 200 to 400 m2 / g, and an average pore diameter from 55 to 100 Angstroms. The sulfated bentonite compositions also can be characterized by a d50 average particle size in a range from 15 to 50 μm and a ratio of d90 / d10 from 3 to 15. The sulfated bentonite compositions can contain a sulfated bentonite and from 10 to 90 wt. % of colloidal particles, or the sulfated bentonite compositions can contain a sulfated bentonite and from 0.2 to 10 mmol / g of zinc and / or phosphorus. These compositions can be utilized in metallocene catalyst systems to produce ethylene based polymers.

The invention belongs to the field of high polymer materials, and particularly relates to a cycloolefin polymer as well as a preparation method and application thereof. The preparation method provided by the invention comprises the following steps: a) in the presence of a catalyst system, carrying out prepolymerization reaction on a polymeric monomer in a solvent to obtain a prepolymer; the polymeric monomer comprises norbornene cycloolefin, and the viscosity of the prepolymer at 25 DEG C is 3-300 cps; and b) continuously mixing the prepolymer with a polymerization monomer for polymerization reaction, and then carrying out hydrogenation reaction on a polymerization reaction product to obtain the cycloolefin polymer. The cycloolefin polymer with excellent tensile strength, tensile modulus and film thickness uniformity can be obtained by adopting a two-step method for polymerization and controlling the viscosity of the prepolymer.

A process for the preparation of a procatalyst for preparing a catalyst composition for an olefin polymerization from a solution of R4zMgX42-z, wherein the solution of R4zMgX42-z is prepared by a process comprising the steps of: (i) reacting a magnesium powder with an organic halide in the presence of an organic solvent at a temperature of T1; (ii) stirring the reaction mixture obtained in step (i) for at least 1 hour at T1; (iii) raising the temperature of the reaction mixture obtained in step (ii) to a temperature T2; (iv) stirring the reaction mixture obtained in step (iii) for at least 1 hour at T2; (v) decanting or filtering the reaction mixture obtained in step (iv) to obtain a transparent solution of R4zMgX42-z in the organic solvent; Wherein T1 ranges from 70° C.-90° C., T2 ranges from T1+30° C. to T1+40° C.

This invention proposes a catalyst component, catalyst, and their applications for olefin polymerization, belonging to the field of olefin polymerization technology. The catalyst component contains products obtained from the reaction of a magnesium source, a titanium source, and an internal electron donor, wherein the internal electron donor comprises furan compounds and diether compounds. The catalyst of this invention exhibits high hydrogen sensitivity and stereoregulation, with a good balance between the two. The molecular weight distribution of the prepared low melt index polymer is broader than that of the high melt index polymer, and the catalyst component of this invention does not contain phthalate compounds (plasticizers).

The embodiment of the invention provides a resin composition as well as a preparation method and application thereof. The resin composition comprises the following components in percentage by mass: 30-60% of a cycloolefin polymer, 3-15% of an olefin polymer and / or a modified olefin polymer and 35-70% of filler, wherein the filler comprises a titanate filler and a non-titanate filler, the mass percent of the titanate filler is 10%-40%, the mass percent of the non-titanate filler is 0-40%, and the dielectric constant of the non-titanate filler is greater than 20. The resin composition provided by the embodiment of the invention has high dielectric constant, low dielectric loss and relatively high heat resistance and impact resistance, can be used as a dielectric material in the field of communication, and can meet the requirements of mechanical properties and heat resistance while improving the signal transmission efficiency.

The invention discloses a high-refraction cycloolefin polymer as well as a preparation method and application thereof, and belongs to the technical field of polymer preparation. A cycloolefin monomer is subjected to a polymerization reaction in an inert solvent in the presence of a catalyst, then a polymerization reaction product is subjected to a hydrogenation reaction, and the pure-hydrocarbon high-refractive-index cycloolefin polymer is obtained. The cycloolefin polymer has excellent refractive index, heat resistance, light transmittance and low hygroscopicity, and can be widely applied to the field of transparent optical materials such as optical lenses and polarizing films, the field of medical instruments such as pre-filling needles and pipettes, and the field of 5G / 6G low-dielectric communication materials.

According to the invention, rigid anthracene is introduced as a framework of bridged binuclear metal, a pyridylamino binuclear metal titanium-zirconium-hafnium catalyst is constructed, and the molecular weight of the obtained polymer can be effectively improved through the synergistic effect between the binuclear metal and the steric hindrance and electronic effect on the catalyst structure; the polyolefin elastomer (POE), the isotatic polypropylene (iPP) and the propenyl elastomer (PBE) are efficiently synthesized. The pyridylamino binuclear metal titanium-zirconium-hafnium catalyst has the advantages that synthesis is simple, raw materials are easy to obtain, and the product yield is high. In copolymerization of ethylene and alpha-olefin, the catalyst shows excellent activity (5.75 * 10 < 7 > g (POE). Mol <-1 > (M). H <-1 >) and alpha-olefin selectivity (the insertion rate reaches 16.2 mol%), and the polyolefin elastomer POE with excellent performance is prepared. In propylene polymerization, the regularity of the polypropylene chain segment can be effectively regulated and controlled by adjusting the steric hindrance and the electronic effect of the catalyst, and the regularity gt is prepared with high activity (3.84 * 10 < 7 > g (PP). Mol <-1 > (M). H <-1 >); and the polypropylene material with high stereoregularity is prepared from 80 mmmm% of polypropylene with high stereoregularity. In copolymerization of ethylene and propylene, an elastomer material which takes propylene as a main material, can regulate and control the ethylene content to be 5-50 wt% and has unique characteristics of a propylene-ethylene semi-crystalline copolymer is prepared. In addition, the pyridylamino binuclear metal titanium-zirconium-hafnium catalyst also shows excellent high-temperature resistance (higher than 160 DEG C), is suitable for high-temperature solution polymerization, and can be used for preparing high-performance polyolefin elastomers. Therefore, the invention has original innovation, and provides a new direction for the development of the field of polyolefin materials.

This invention relates to a method of reducing abnormal combustion events in a hydrogen fueled internal combustion engine (HICE) during operation of the engine. The method includes the steps of: a) providing to the HICE a lubricating oil composition including or resulting from the admixing of: i) a base oil having a KV100 of less than or equal to 12 cSt and included at greater than 50 wt.% of the composition and comprising a Group I base oil, a Group II base oil, a Group III base oil, a Group IV base oil, or combinations thereof; ii) at least one olefin polymer at from 1.0 to 20 wt.% based upon the total weight of the lubricating oil composition, wherein the at least one olefin polymer comprises a partially or fully saturated olefin homopolymer or copolymer backbone having an Mn of 10,000 g / mol or more (GPC-PS), and wherein the homopolymer or copolymer backbone is derived from monomers selected from the group consisting of C2 to C30 linear alpha olefins, C4 to C20 conjugated dienes, and combinations thereof; iii) at least one overbased metal containing detergent with a Total Base Number (KOH / g) greater than or equal to 9 and less than or equal to 500 and included at a treat level to deliver between 100 to 5000 ppm by weight of total metal and between 0.15 wt. % to 8.0 wt. % of total soap to the composition; and iv) the lubricating oil composition having a total sulfated ash of less than or equal to 2.5 wt.%, a total phosphorous level of less than or equal to 0.120 wt.%, and a SAE viscosity grade of 25W-X, 20W-X, 15W-X, 10W-X, 5W-X or 0W-X, where X represents any one of 8, 12, 16, 20, 30, 40, 50 or 60; b) providing a fuel comprising hydrogen to the HICE; and c) combusting the fuel in the HICE. Also provided are lubricating oil compositions and concentrates for use in a HICE to reduce the propensity for abnormal combustion events.

The present application relates to the field of olefin polymerization. Provided are an ethylene-α-olefin copolymer, a preparation method therefor, an encapsulant composition comprising the ethylene-α-olefin copolymer, and an encapsulant film formed by using the encapsulant composition. The ethylene-α-olefin copolymer has the following properties: the density is 0.860-0.905 g / cm3; according to a GPC test, the weight-average molecular weight is 20000-200000 g / mol with a unimodal distribution, and the molecular weight distribution polydispersity index (PDI) range is 2.3-3; and according to a TGIC test, said copolymer has two elution peaks, the temperature difference between the two peaks being 5-30 ℃, and the highest elution temperature in an obtained TGIC curve is not higher than 125 ℃. The ethylene-α-olefin copolymer is used for encapsulating solar cells, has relatively high mechanical properties, can shorten the mixing time of auxiliaries or improve the degree of crosslinking during processing, and exhibits a good performance in casting for film formation, thus effectively reducing the generation of fisheyes.

Described are thermally conductive flame-proof compositions which have a high comparative tracking index and contain bisphenol A homopolycarbonate, talc, phosphorus-containing flame retardant, fluorine-containing anti-drip agent, and anhydride-modified alpha-olefin polymer. Said compositions have a high comparative tracking index, thus allowing distances between electrical conductors in electronic and electrical components to be kept shorter than in the past.

A method is disclosed for producing a catalyst, which suppresses a decrease in polymerization activity due to early deactivation of the active site after the catalyst has been formed, exhibits excellent catalyst activity at the time of polymerization of olefins, and can produce polymers of olefins, which are excellent in stereoregularity. The method for producing a catalyst includes contacting a solid catalyst component (A) containing magnesium, titanium, halogen and an internal electron-donating compound, and a specific organoaluminum compound (B) represented by the general formula (I), with each other, wherein at least one selected from the solid catalyst component (A) and the organoaluminum compound (B) is previously subjected to contact treatment with a hydrocarbon compound having one or more vinyl groups, in an organic solvent containing 30% by mass or more of one or more compounds selected from saturated aliphatic hydrocarbon compounds having 20 or more carbon atoms.

This invention relates to the field of olefin polymerization, and discloses a metallocene compound, a catalyst composition using the metallocene compound, an olefin polymerization method using the catalyst composition, and the application of the metallocene compound or the catalyst composition in olefin polymerization. The metallocene compound has the structure shown in formula (1), where M is a tetravalent transition metal atom; X 1 and X 2 Each group is independently a halogen atom, an alkyl group with 1-10 carbon atoms, an aromatic group with 6-12 carbon atoms, or an N,N-dialkylamine group with 2-8 carbon atoms. Using the catalyst composition of the present invention provides advantages such as high catalytic activity, good copolymerization performance, and high molecular weight of the obtained polymer.

The present invention relates to a solid catalyst component for olefin polymerization, a catalyst for olefin polymerization, and a method for producing an olefin polymer. Provided are a method for producing a solid catalyst component for olefin polymerization, a method for producing a catalyst for olefin polymerization, and a method for producing an olefin polymer, which have excellent polymerization activity and can produce a polymer with excellent stereospecificity. Provided is a method for producing a solid catalyst component for olefin polymerization, the method comprising contacting a magnesium compound and a specific styrene-based compound with each other to obtain a pre-contact product, and then contacting the pre-contact product, a titanium halide compound, and an internal electron donor compound with each other to obtain a solid catalyst component for olefin polymerization; and a method for producing a catalyst for olefin polymerization and a method for producing an olefin polymer using the solid catalyst component for olefin polymerization obtained by this production method.

The present invention relates to a polyolefin polymer, and a system and method for polymerizing same, the polymer having a density of 0.868 to 0.897 g / cm3, a melt flow index (MIE, 190°C with a load of 2.16 kg) of 0.1 g / 10 min to 20.0 g / 10 min, a PDI of 1 to 5, a number average molecular weight (Mn) of 20,000 to 70,000 g / mol, a weight average molecular weight (Mw) of 50,000 to 150,000 g / mol, and two or more melting temperatures (Tm).

The invention belongs to the technical field of chemical materials, and particularly relates to an anti-aging treatment process for a cycloolefin-based high polymer material. The cellulose crystal, the ethylene-butyl acrylate copolymer, the antioxidant 1010 and the antioxidant DLTP are specifically combined, so that the thermal decomposition speed of the polymer at high temperature is reduced, and the oxidation reaction of the cycloolefin polymer in the processing and using processes is inhibited; all the raw materials have a synergistic effect, the oxidation performance of the cycloolefin polymer is inhibited, and the anti-aging performance is improved. Therefore, the anti-aging agent provided by the invention can improve the anti-aging performance of the cycloolefin-based high polymer material, and can be used for preparing anti-aging products of the cycloolefin-based high polymer material.

A propylene (co) polymerization process carried out in the presence of (i) a Ziegler-Natta catalyst comprising Mg, Ti and an internal donor, (ii) an aluminum alkyl promoter, optionally (iii) an external donor, and (iv) a polymerization process aid (PPA) comprising a monoglyceride of a monounsaturated C16-C18 monocarboxylic acid, said component (iv) being used in an amount of at least 40 ppm based on the amount of polyolefin produced.