120 results about "Ethylene Polymers" patented technology

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.

The present invention relates to a polypropylene composition comprising (A) from 80.0 to 99.0 wt.-% of a copolymer of propylene and comonomer units selected from ethylene and alpha-olefins having from 4 to 12 carbon atoms having a total amount of comonomer units of from 10.0 to 16.0 wt %, based on the total amount of monomer units of the copolymer of propylene (A); a melt flow rate MFR2 of from 0.5 to 2.5 g / 10 min; a xylene cold soluble (XCS) fraction in a total amount of from 25.0 to 50.0 wt %, based on the total weight amount of the copolymer of propylene (A); and (B) from 1.0 to 20.0 wt.-% of an ethylene polymer having a density of from 915 to 960 kg / m3; and a melt flow rate MFR5 (190° C., 5 kg) of from 0.05 to 5.0 g / 10 min, an article comprising said polypropylene composition, preferably a cable comprising an insulation layer comprising said polypropylene composition, and the use of said polypropylene composition as cable insulation for medium and high voltage cables.

Expandable styrene polymers comprising polymeric brominated flame-retardant, wherein the polymeric brominated flame-retardant comprises at least one brominated polybutadiene block having a bromination degree between 33 and 75%, based on the double bonds in the polybutadiene block before bromination, a process for producing such expandable styrene polymers by suspension polymerization and particulate foam moldings made therefrom.

The objective is to provide polyethylene resin that minimizes the leaching of contaminants such as elutes and degraded materials when used as a container for semiconductor cleaning chemicals. [Solution] Density of 0.960~0.970 g / cm³ 3 A low molecular weight ethylene-based polymer with a density of 0.920-0.940 g / cm³ 3 A polyethylene resin comprising two components of a high molecular weight ethylene polymer, wherein the weight ratio of the two components is 40:60 to 60:40, and having specific properties.

A process for preparing an ethylene polymer in a suspension polymerization including the steps of separating the formed suspension of ethylene polymer particles in a solid-liquid separator into ethylene polymer particles and mother liquor, transferring a first part of the mother liquor into a work-up section including an evaporation unit for producing a wax-depleted portion of the mother liquor, wherein a protic agent is added to the part of the mother liquor which is transferred into the work-up section, and recycling a first part of the wax-depleted portion of the mother liquor to the polymerization reactor or the series of polymerization reactors.

The invention relates to a curable composition comprising (a) at least one ethylene polymer, (b) less than 2 parts by weight of at least one monoperoxycarbonate per 100 parts by weight of component (a), (c) 0.4 to less than 4 parts by weight of at least one tertiary alkyl hydroperoxide per 100 parts by weight of component (b). The invention further relates to a method for preventing scorching of a curable composition comprising an ethylene polymer by adding a specific amount of a tertiary alkyl hydroperoxide to the curable composition and a method for preparing a scorch resistant material.

The present disclosure relates to polyethylene polymers and films made therefrom. In some embodiments, the polyethylene copolymer comprises 90 wt% or more ethylene units and the balance of C3-C20 comonomer units. The polyethylene copolymer has a bimodal composition distribution, a density of from about 0.914 g / cm3 to about 0.925 g / cm3, a melt index of from about 0.1 g / 10 min to about 1 g / min, a high load melt index (HLMI) of from about 1 or 12 g / 10 min to about 30 g / 10 min, a melt index ratio (MIR) of from about 30 or 35 to about 60 or 65, and a molecular weight distribution (MWD) of from about 3 or 4.5 to about 7 or 7.5. The copolymers may also exhibit a bimodal compositional distribution such as a combination of a wide orthogonal compositional distribution (BOCD) and a long chain branching (LCB).

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 present disclosure relates to catalysts, polyethylene polymers, polymerization processes for making such polyethylene polymers, and films made therefrom. In some embodiments, the catalyst system includes a first catalyst compound. The first catalyst compound is represented by formula (I). At least one pair of R4 and R5, R5 and R6 or R6 and R7 of formula (I) is linked to form a first substituted or unsubstituted fully saturated ring fused to the indenyl ring, and at least one pair of R11 and R12, R12 and R13 or R13 and R14 is linked to form a second substituted or unsubstituted fully saturated ring fused to the indenyl ring. The catalyst system further includes a second catalyst represented by formula (III). At least one pair of R7 and R8, R8 and R9, or R9 and R10 of formula (III) is linked to form a substituted or unsubstituted fully saturated ring fused to the indenyl ring.

The present invention relates to a biaxially stretched film having a layer obtained from a material containing an ethylene-based polymer having a melt flow rate (MFR) of 0.01 g / 10 minutes to 5.0 g / 10 minutes (inclusive), a density of 941 kg / m3 to less than 970 kg / m3, and a melt tension of 31 to 250 mN, the ratio (Mw / Mn) of the weight-average molecular weight (Mw) to the number-average molecular weight (Mn) of the ethylene-based polymer measured by gel permeation chromatography (GPC) is 6.1 or more.

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).

Provided herein is a reactor blend ethylene polymer composition comprising at least two identifiable components with distinct structural and compositional characteristics; namely: a first ethylene polymer and a second ethylene interpolymer. The ethylene polymer composition is produced in a continuous solution polymerization process in which the first ethylene polymer is formed in a first solution polymerization reactor by polymerizing ethylene and optionally at least one α-olefin with a first homogenous catalyst formulation; and the second ethylene interpolymer is formed in a second solution polymerization reactor by polymerizing ethylene and at least one α-olefin with a second homogeneous catalyst formulation. The provided ethylene polymer compositions can advantageously be used in applications where easy-opening, mono-material packaging systems are desired.

The invention relates to a curable and preferably polymer composition that is useful as a sealant, an adhesive (e.g., structural adhesive), a reinforcement, a dampener, a sound absorber or any combination thereof. The composition preferably comprises one or more ethylene polymers, tackifier, curing agent, and rheology modifier. The invention also relates to extrusion of the composition onto an article surface, e.g. through a robotically mounted extrusion die, and subsequent activation for curing by an external stimulus.

The present invention provides a reactor-blended ethylene polymer composition comprising at least two identifiable components having different structural and compositional properties, namely a first ethylene polymer and a second ethylene copolymer. The ethylene polymer composition is produced by a continuous solution polymerization process, wherein the first ethylene polymer is formed by polymerizing ethylene and optionally at least one α-olefin in a first solution polymerization reactor using a first homogeneous catalyst composition, and the second ethylene copolymer is formed by polymerizing ethylene and at least one α-olefin in a second solution polymerization reactor using a second homogeneous catalyst composition. The ethylene polymer composition of the present invention can be advantageously used in applications where an easily openable single-material packaging system is required.

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.

Thermoplastic compositions include: from 35 wt% to 59 wt% of at least one polyethylene polymer; from 25 wt% to 45 wt% of at least one graphite filler; and from 16 wt% to 22 wt% of at least one carbon black filler having a BET surface area of at most 600 square meters per gram (m2 / g) as determined in accordance with ASTM D3037, an oil absorption number (OAN) of at most 300 ml / 100g as determined in accordance with ASTM D2414, and an iodine absorption of at most 600 mg / g as determined in accordance with ASTM D1510. The composition has a volume electrical resistivity of at most 1.65 ohm. centimeter (ohm.cm), and a capillary melt viscosity of at most 3300 Pascal-seconds (Pa s) at a temperature of 280 °C and a shear rate of 100 reciprocal seconds (1 / s).

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.

Processes for preparing ethylene polymer compositions include a step of melt processing a blend of an ethylene polymer and an additive composition through a pelletizing or strand die to produce the ethylene polymer composition. The ethylene polymer contains from 1 to 50 ppm of inorganic fluorine, the additive composition contains a polyethylene glycol at an amount from 100 to 10,000 ppm based on the weight of the ethylene polymer composition, and the ethylene polymer composition is substantially free of organic fluorine. Ethylene polymer compositions and methods of making films from the ethylene polymer compositions also are encompassed herein.

The present invention relates to a cast film comprising a polypropylene composition comprising a) more than 85 to less than 98 wt.-% (based on the overall weight of the polyolefin composition) of at least one polypropylene polymer (PP) having a MFR2 (according to ISO1133, 2.16 kg load at 230 °C) in the range from 1.0 to 6.0 g / 10 min, a molecular weight distribution index Mw / Mn measured by GPC (according to ISO 16014-4:2003 and ASTM D 6474-99) in the range from 4.0 to 8.0, a xylene soluble content (XCS) determined according to ISO 16152 based on the overall weight of polypropylene polymer in the range from 2.0 to 3.5 wt.-%, b) more than 2.0 to less than 15 wt.-% (based on the overall weight of the polyolefin composition) of a hydrocarbon resin product comprising a hydrocarbon resin having a glass transition temperature TG (according to ISO 11357-2:2020) of more than 50°C, preferably in the range from 50 to 125°C; and a weight average molecular weight Mw (according to ISO 16014-4:2003 and ASTM D 6474-99) in the range from 1.0 to 10.0 kg / mol; and c) optionally further additives, wherein the sum of all ingredients always adds up to 100 wt.-%.

A medical easy-to-tear film and a manufacturing method thereof are disclosed. The medical easy-to-tear film comprises a release layer and an auxiliary layer. The release layer comprises a propylene block polymer and an ethylene polymer. The content of the propylene block polymer is between 60 wt% and 80 wt% and the content of the ethylene polymer is between 20 wt% and 40 wt% based on the total weight of the release layer being 100 wt%. The auxiliary layer comprises a propylene block polymer and a propylene random copolymer. The content of the propylene block polymer is between 90 wt% and 99 wt% and the content of the propylene random copolymer is between 1 wt% and 10 wt% based on the total weight of the auxiliary layer being 100 wt%. The medical easy-to-tear film has a heat seal strength of between 5 N / 15 mm and 15 N / 15 mm after 30 minutes in an environment of 135 °C.

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.