34 results about "Ethylene Polymers" patented technology

The application discloses a light reflection and enhancement film and an enhanced photovoltaic module with the same, the light reflection and enhancement film comprises a buffer layer and a substrate layer, the preparation raw materials of the buffer layer comprise an ethylene polymer, a mesoporous composite material, a filler and an additive, and the preparation raw materials of the substrate layer comprise a propylene polymer alloy, the mesoporous composite material, the filler and the additive. The light reflection and enhancement film and the enhanced photovoltaic module with the same have the advantages that the mesoporous material is compounded with the nanometer material to form the mesoporous composite material, and then the mesoporous composite material is used for preparing the buffer layer and the substrate layer, so that the reflectivity of the ultraviolet region of 330-380 nm, the adhesion between the buffer layer and the battery and the adhesion between the substrate layer and the adhesive film are improved, the light reflection and enhancement film is applied to the gap position between the battery pieces on the photovoltaic battery, the battery hidden crack and the fragments can be avoided, and the module power can be greatly improved compared with the application on the glass.

The purpose of the present invention is to provide an airbag storage cover that has excellent long-term heat resistance, long-term light resistance, and fogging resistance while maintaining high-temperature strength and low-temperature impact resistance. The present invention relates to an airbag storage cover containing a thermoplastic elastomer composition containing 10-300 parts by mass of the following component (B) with respect to 100 parts by mass of the following component (A). Component (A): Propylene-based polymer. Component (B): Olefin-based block copolymer containing an ethylene polymer block and an ethylene 1-octene copolymer block, and satisfying the following condition (X1). Condition (X1): In the proportion of triad monomer sequences determined by 13C NMR measurement, the sum of OOO, OOE, and EOO is 6.0-20.0% (where E represents an ethylene monomer unit and O represents an octene monomer unit).

The present invention relates to a polyethylene composition comprising an ethylene polymer and a specific polymer nucleating agent, a method for preparing the polyethylene composition, the use of the polymer nucleating agent for nucleating the polyethylene composition, and the use of a masterbatch comprising the polymer nucleating agent for nucleating the polyethylene composition.

This invention discloses an ethylene copolymer containing ethylene structural units derived from ethylene, α-olefin structural units derived from α-olefins, and conjugated diene structural units derived from conjugated dienes. The molar ratio of the ethylene structural units to the conjugated diene structural units is 2-10:1. Based on the total amount of the ethylene copolymer, the content of the conjugated diene structural units is 5-20 mol%. The ethylene copolymer also contains anti-1,4-structural units, which are structural units formed by 1,4-polymerization of the conjugated diene and possessing anti-1,4-double bonds. Based on the total amount of the conjugated diene structural units in the ethylene copolymer, the content of the anti-1,4-structural units is 10-50 mol%. The ethylene copolymer according to this invention exhibits good compatibility and co-vulcanization properties. The ethylene copolymer according to this invention has broad application prospects in the rubber industry, particularly in the field of automotive tire rubber.

The embodiment relates to a process for producing an ethylene-based polymer in a reactor system comprising a first reactor and a second reactor. The process involves ethylene, one or more (C3-C3) polymers. 14 Polymerizing an α-olefin monomer and at least one polyene in a first reactor in the presence of one multi-chain catalyst and at least one single-chain catalyst to produce a first reactor polyethylene product containing long-chain branching, wherein the multi-chain catalyst contains multiple polymerization sites, and the long-chain branching is produced by the cooperative bonding of two polymer chains of the multi-chain catalyst with the polyene during polymerization, and the first reactor polyethylene product contains ethylene and one or more (C3~C 14 The method comprises polymerizing an α-olefin monomer in a second reactor in the absence of an initial polyene feed and in the presence of at least one single-chain catalyst to produce a second reactor polyethylene product, wherein the ethylene polymer comprises the first and second reactor polyethylene products.

A plant for producing an ethylene polymer, the plant comprising a primary compressor and a secondary compressor with an outlet; a temperature adjusting system with an inlet and an outlet, the temperature adjusting system being in fluid communication with the secondary compressor outlet; a reaction system with an inlet in fluid communication with the outlet of the temperature adjusting system, the reaction system comprising a tubular reactor, wherein the tubular reactor has two or more reaction zones, wherein each reaction zone comprises i) a reaction section having an inside diameter and ii) a super cooler downstream and in direct fluid communication with the reaction section; and a controller configured to allow that a fluid has a residence time in the reaction section of no more than 60 seconds; wherein the tubular reactor is configured to operate at a pressure from 120 MPa to 350 MPa or higher; and wherein the super cooler comprises two or more parallel flow tubes having an inside diameter smaller than the inside diameter of the reaction section. And a process for producing an ethylene (co)polymer by polymerizing ethylene or, alternatively, ethylene and a comonomer, in a plant as defined above.

A polyethylene composition for preparing strapping tape, comprising: A) 60% to 98% by weight of an ethylene polymer component having a density DA of 950 to 965 kg / m³. 3 The MIF value is 15 to 50 g / 10 min, and the stress cracking resistance, as determined by the full-notch creep test (FNCT) according to ISO 16770:2004 at 50 °C, 6.0 MPa, and 2% by weight of Arkopal N100 aqueous solution, is equal to or greater than 3 hours; B) 2% to 40% by weight of ethylene polymer component, the density of which is D B 949 to 965 kg / m 3 The MIE value is 0.1 to 3 g / 10 min, and the polydispersity index (PDI) is 6 to 25; where PDI is the ratio of weight-average molecular weight Mw to number-average molecular weight Mn, Mw / Mn, and the amounts of A) and B) refer to the total weight of A) + B).

In one aspect, the present disclosure pertains to a method of forming a lubricious coated medical device, the method comprising forming a lubricious coating suspension, wherein the lubricious coating suspension comprises a lubricious polyethylene polymer and a polar solvent, wherein the lubricious coating suspension is per- and polyfluoroalkyl substance (PFAS)-free, and applying the lubricious coating suspension to a substrate to form a lubricious coated medical device.

According to one or more embodiments described herein, a multilayer film may comprise a first layer which may comprise a first polyethylene polymer, a core which may comprise a first core layer which may comprise a first polyolefin, and a second layer which may comprise a second polyethylene polymer. The core may be positioned between the first layer and the second layer. The thickness of the first core layer may be less than 10% of the total thickness of the multilayer film. The first polyolefin may comprise 4% to 12% by weight of ethylene and 75% to 96% by weight of propylene, based on the total weight of the first polyolefin. The first polyethylene polymer and the second polyethylene polymer may have the same composition or different compositions. The multilayer film may be oriented in the mechanical direction with a stretch ratio of at least 4:1.

A slurry polymerization process for producing polyethylene in a polymerization reactor at a temperature of 40°C to 150°C and a pressure of 0.1 MPa to 20 MPa to obtain an ethylene-based polymer, wherein the polymerization occurs in the reactor slurry at least in the presence of a catalyst, ethylene and a diluent in the polymerization reactor, wherein the process comprises a shutdown phase in which at least one reactor inlet is closed, the reactor is cooled to a predetermined temperature threshold, the agitator is stopped, the reactor slurry is allowed to settle to the bottom of the internal reactor volume, active cooling of the reactor and heat exchangers is stopped, and the circulation loop pump is stopped.

This invention relates to a resin composition wherein the content of a propylene polymer (A) satisfying specified conditions is 10 to 99.9 parts by mass, the content of a propylene polymer (B) satisfying specified conditions is 0 to 40 parts by mass, the content of a polyolefin (C) containing structural units derived from unsaturated carboxylic acids and / or their derivatives is 0.1 to 20 parts by mass, and the content of an ethylene polymer (D) satisfying specified conditions is 0 to 40 parts by mass (wherein, the total content of components (A), (B), (C) and (D) is set to 100 parts by mass).

A slurry polymerization method for producing polyethylene in a polymerization reactor at a temperature of 40°C to 150°C and a pressure of 0.1 MPa to 20 MPa to obtain an ethylene-based polymer, wherein polymerization takes place in a polymerization reactor in the presence of at least a catalyst, ethylene, and a diluent in the reactor slurry, and the method comprises a shutdown step in which at least one reactor inlet is closed, the reactor is cooled to a predetermined temperature threshold, the stirrer is stopped so that the reactor slurry settles to the bottom of the internal volume of the reactor, active cooling of the reactor and heat exchanger is stopped, and the circulation loop pump is stopped.

Methods for modifying a catalyst system component include the steps of contacting the catalyst system component with a fluid to form either a paste or agglomerated particles, depending upon the relative amount of fluid used based on the void volume of the catalyst system component, followed by drying and comminuting to form a modified catalyst system component. The amount of the modified catalyst system component having a particle size of less than or equal to 10 μm is less than that of the catalyst system component. Specific catalyst component compositions and ethylene polymer compositions characterized by their respective particle size distributions also are disclosed.

Optical fiber article comprising at least one optical fiber and a functional layer arranged on the surface of the optical fiber; wherein the functional layer comprises at least one functional silane having the following structural formula: wherein Z is a branched or unbranched alkyl or aryl group having 1 to 18 carbon atoms, wherein R1, R2 and R3 are independently selected from hydrogen, oxygen, alkyl, alkyloxy, hydroxyalkyl and hydroxyl, and wherein one, two or three of the groups R1, R2 or R3 are directly or indirectly connected to the surface of the optical fiber via a covalent bond, and wherein R4 is selected from -NH2, -NHR', -NR'R'', glycidyloxy and -SH, wherein R' and R'' are independently selected from alkyl, aminoalkyl, hydroxyalkyl and -(CH2)mNH2 with m from 1 to 6, wherein the proportion of the functional silane in the functional layer is at least 1.5 wt.% and at most 70 wt.%.-% and wherein the content of polyvinyl polymers is less than 1 wt% based on the mass of the functional layer, wherein the content of photopolymerized polymers, in particular polyacrylates, polymethacrylates, polyvinyl polymers, polystyrene and / or derivatives thereof, in the functional layer is less than 1 wt% based on the mass of the functional layer.

A polyethylene composition for the preparation of tapes, comprising: A) from 70% to 98% by weight of an ethylene polymer component having a density D 3 of from 952 to 965 kg / m A ; a MIF value of from 10 to 35 g / 10 min.; and a polydispersity index PDI A of from 15 to 35 ; B) from 2% to 30% by weight of an ethylene polymer component having a density D 3 of from 949 to 965 kg / m B ; a MIE value of from 0.1 to 3 g / 10 min.; and a polydispersity index PDI B of from 6 to 25 ; wherein the value of PDI A is higher than the value of PDI B , both PDI A and PDI B being the ratio Mw / Mn of weight average molecular weight Mw and number average molecular weight Mn, and the amount of A) and the amount of B) being referred to the total weight of A) + B).

This invention provides a method for preparing multi-peak ethylene polymers in a multi-stage process in the presence of a catalyst comprising a complex of formula (Ix); wherein each X is a σ-donor ligand; each Het is independently a monocyclic or polycyclic heteroaromatic group or heterocyclic group containing at least one heteroatom selected from O, N, or S; L is a divalent bridge based on carbon, silicon, or germanium, wherein one or two skeletal atoms connect the ligand; M is Ti, Zr, or Hf; each R1 is the same or different, and is a straight-chain C 1‑10 Alkyl or straight-chain C 1‑10 Alkyl groups, each n is 0 to 3; each R2 is the same or different, and is C 1‑10 Alkyl, C 1‑10 Alkoxy or -Si(R)3 group; each R may be the same or different, and is optionally surrounded by 1 to 3 Cs. 1‑6 Alkyl-substituted C 1‑10 Alkyl or phenyl; each p is 0 to 3.

The invention relates to a polymer composition comprising a thermoplastic elastomer TPE and a thermoplastic polyethylene polymer PE, wherein the thermoplastic elastomer TPE is a thermoplastic block elastomer TPE1 of formula A-B-A, in which A is a thermoplastic block predominantly comprising, in moles, α-methylstyrene units and B is a diene elastomer block comprising more than 95 wt.-% diene units relative to the weight of the diene elastomer block, or a thermoplastic block elastomer TPE2 of formula A'-B'-A', in which A' is a thermoplastic block predominantly comprising, in moles, α-methylstyrene units and B' is a random copolymer elastomer block comprising diene units and vinylaromatic units, or a blend of both of the thermoplastic block elastomers TPE1 and TPE2, the polyethylene PE having a melting temperature, Tf, within a range from 100°C to 135°C; the invention also relates to a tire comprising such a composition in all or part of its tread.

One embodiment of the present invention is an ethylenic polymer particle, having a specific surface area of larger than 2.00 m2 / g and 30.0 m2 / g or smaller, as determined by a BET method from the adsorption / desorption isotherms measured by a nitrogen gas adsorption method, and a median diameter (D50) of 20 µm or larger and 700 pm or smaller as determined by laser diffraction / scattering.

The application relates to the field of high polymer materials, and discloses a bimodal polyethylene polymer, a preparation method and application thereof, and stone paper. 4 The bimodal polyethylene polymer has a weight average molecular weight of 20-40*10 3 ; a molecular weight distribution of 10-30; a melt flow ratio (21.6 / 5.0) of 25-40; and a melt index under a 5.0kg load at 190 DEG C of 0.01-10g / 10min. The bimodal polyethylene polymer has a bimodal distribution and wide distribution of molecular weight, low fluidity, and good mechanical properties. The bimodal polyethylene polymer is used for the stone paper, has good compatibility with calcium carbonate, the prepared stone paper has a CV value of less than 3%, a density of up to 1.18g / cm 3 , and a stiffness of up to 0.4, and good technical effects are achieved.

Disclosed herein are ethylene-based polymers generally characterized by a melt index of less than 1 g / 10 min, a density from 0.93 to 0.965 g / cm3, a CY-a parameter at 190° C. of less than 0.2, an average number of short chain branches per 1000 total carbon atoms of the polymer in a molecular weight range of 400,000 to 600,000 g / mol that is greater than that in a molecular weight range of 40,000 to 60,000 g / mol, and an average number of long chain branches per 1000 total carbon atoms of the polymer in a molecular weight range of 400,000 to 600,000 g / mol that is greater than that in a molecular weight range of 4,000,000 to 6,000,000 g / mol. The ethylene polymers can be used to fabricate pipes, blown films, and blow molded products, and the ethylene polymers can be produced with a dual catalyst system containing a single atom bridged or two carbon atom bridged metallocene compound with two indenyl groups or an indenyl group and a cyclopentadienyl group, and a single atom bridged metallocene compound with a fluorenyl group and a cyclopentadienyl group with an alkenyl substituent.

An adhesive resin composition, including from 60 to 95 parts by mass of an ethylenic polymer (A) including a modified ethylenic polymer (a-2) obtained by modifying at least one polymer (a-1) selected from the group consisting of an ethylene homopolymer and a copolymer of ethylene and at least one α-olefin selected from α-olefins having from 3 to 20 carbon atoms, with an unsaturated carboxylic acid and / or a derivative thereof, and from 5 to 40 parts by mass of a butene-based polymer (B) having 80 mol % or more of a structural unit derived from 1-butene, provided that the total content of the polymer (A) and the polymer (B) is 100 parts by mass, wherein the MER (190° C. and a load of 2.16 kg) is from 1 to 20 g / 10 minutes.

Methods for modifying a catalyst system component include the steps of contacting the catalyst system component with a fluid to form either a paste or agglomerated particles, depending upon the relative amount of fluid used based on the void volume of the catalyst system component, followed by drying and comminuting to form a modified catalyst system component. The amount of the modified catalyst system component having a particle size of less than or equal to 10 µm is less than that of the catalyst system component. Specific catalyst component compositions and ethylene polymer compositions characterized by their respective particle size distributions also are disclosed.

Provide a process for producing an ethylene polymer having improved melt strength for an upward branching level. 【Solution means】This process includes providing a multifunctional branching agent (MFBA). MFBA has three or more carbon-carbon double bonds on the condition that (A) MFBA is not a polymer of butadiene and does not contain an acrylate group or a methacrylate group, and MFBA has a total reactivity R of 3 < R < 40 determined by the following formula (I). JPEG2026086607000017.jpg22170 In the formula, j = the product of exponents, p = the number of different types of carbon-carbon double bonds j in the molecule, n j = the number of each carbon-carbon double bond of type j in the molecule, r 1,j = the relative reactivity ratio (RRR) of ethylene to carbon-carbon double bond j. This process includes reacting MFBA with ethylene under polymerization conditions and forming an ethylene polymer composition composed of units of ethylene and units of MFBA.

Disclosed are polymerization processes and reactor systems for producing multimodal ethylene polymers using at least one loop reactor and at least one fluidized bed reactor. Configurations include a loop reactor in series with a fluidized bed reactor and two loop reactors in series with a fluidized bed reactor.