26 results about "Polyvinyl polymer" patented technology

The present disclosure relates to a metallocene-catalysed multimodal polyethylene polymer (P), and to methods and uses of the multimodal polymer (P) of ethylene in film applications, and to a film including the disclosed polymer (P).

A polymeric material is provided that includes a modified polyvinyl polymer having a polyvinyl chain including one or more units having moieties produced by reaction of a reactant with a polyvinyl alcohol. A method of making a modified polyvinyl polymer includes reacting a polyvinyl alcohol with one or more reactants in the presence of a solvent. Packaging includes a polymeric material including a modified polyvinyl polymer.

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 invention provides a coating and molding method. The coat gel molding method according to embodiments disclosed herein includes a loading step, a heating step, a cooling step, and a removal step. The coat gel molding process comprises using a particulate polyethylene composition comprising a polyethylene polymer, a polyalkylene glycol having a weight average molecular weight greater than 2000 at a concentration of 0.01 to 1 wt%, based on the weight of the polyethylene polymer. The gelling molding methods disclosed herein can result in suitable densification with reduced PIAT.

A multilayer polymer pipe including a first tubular layer, the first layer having as main component one or more polyethylene polymers and which layer further includes at least one compatibilizer, preferably a functionalized polyethylene polymer, a second layer surrounding the first layer, the second layer including one or more polyamide polymers and being substantially free of compatibilizer, a third layer surrounding the second layer, the third layer including one or more polyketone polymers and being substantially free of compatibilizer, a fourth layer surrounding the third layer, the fourth layer including one or more polyamide polymers and being substantially free of compatibilizer, a fifth layer surrounding the fourth layer, the fifth layer including as main component one or more polyethylene polymers and which further includes at least one compatibilizer, preferably a functionalized polyethylene polymer.

A polymer composition comprises a polyethylene polymer having a Melt Relaxation Index of 2 or greater and a salt of a branched alkyl phosphonic acid. A polyethylene film having improved barrier to water vapor and oxygen comprises a high-density polyethylene polymer having a density of about 930 kg / m3 to about 980 kg / m3 and a Melt Relaxation Index of 2 or greater and a salt of a branched alkyl phosphonic acid.

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.

The present disclosure provides a liquid formulation comprising: (a) RK-33, (b) cholic acid or derivative thereof, (c) a water-soluble polyvinyl polymer, and (d) water. The disclosure also provides a method of making a liquid formulation comprising RK-33. The disclosure further provides a method of treating cancer in a subject in need thereof, the method comprising (a) diluting the formulation of the present disclosure to form a diluted formulation, and (b) intravenously administering to the subject the diluted formulation.

The application discloses a kind of lignin reversible crosslinking PE plastics and its preparation method and application, it is related to the field of modified plastics.Lignin reversible crosslinking PE plastics includes the following components by mass fraction: maleimide functionalized lignin 8~12 parts, furan functionalized maleic anhydride grafted polyethylene oligomer 2.5~15 parts, polyethylene 100 parts.The maleimide functionalized lignin is obtained by reaction of alkali lignin and maleimide compound containing siloxane group;The furan functionalized maleic anhydride grafted polyethylene oligomer is obtained by reaction of maleic anhydride grafted polyethylene polymer and furan derivative containing amino group.By modifying lignin and introducing DA bond, the compatibility of lignin and polyethylene is increased, and the reversible crosslinking of PE plastic is realized, so that the PE plastic has good mechanical properties, ultraviolet resistance and repeatable processability.

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.

This disclosure relates to a method for polymerizing olefins in a multi-stage polymerization process configuration, the method comprising: a) in a first polymerization step, optionally in the presence of at least one other α-olefin comonomer, polymerizing ethylene in the presence of a polymerization catalyst to form a first polymer component (A); and b) in a second polymerization step, optionally in the presence of at least one other α-olefin comonomer, polymerizing in the gas phase in the presence of the first polymer component (A) from step a) a predetermined monomer mixture comprising ethylene and 1-hexene to form a second polymer component (B), wherein the multimodal polyethylene polymer produced by this method comprises a 1-hexene comonomer and at least one additional C4-10 comonomer, and wherein the predetermined monomer mixture comprising ethylene and 1-hexene is fed into the second polymerization step at startup of the second polymerization step. This disclosure further relates to the use of 1-hexene in the gas-phase olefin polymerization step for improving the performance of a single-point polymerization catalyst in a multi-stage olefin copolymerization method. This disclosure further relates to a method for improving the performance of a single-point polymerization catalyst in multi-stage olefin polymerization, comprising feeding a predetermined monomer mixture comprising ethylene and 1-hexene into the gas-phase polymerization step at the start of the gas-phase polymerization step.

A polymer composition comprises a polyethylene polymer having a Melt Relaxation Ratio of 1.5 or greater and a salt of a branched alkyl phosphonic acid. A method for molding a thermoplastic polymer composition comprises the steps of (a) providing an apparatus comprising a die and a mold cavity; (b) providing the polymer composition described above; (c) heating the polymer composition to melt the polymer composition; (d) extruding the molten polymer composition through the die to form a parison; (e) capturing the parison in the mold cavity; (f) blowing a pressurized fluid into the parison to inflate the parison and conform it to the interior surface of the mold cavity; (g) allowing the molded article to cool so that the molded article retains its shape; and (h) removing the molded article from the mold cavity.

A polyolefin composition comprising: a) from 70 to 99 wt% of a polyethylene polymer (A) wherein the polyethylene polymer is a copolymer of ethylene and one or more C3-C12 alpha-olefins having an MFR (190 DEG C / 2.16 kg, ISO 1133) of from 0.1 to 5.0 g / 10 min, a melting point Tm (DSC, ISO 11357 / 3) of less than 100 DEG C, and a density (ASTM D792) of from 865 to 905 kg / m3; and b) from 1 to 30 wt% of a high density polyethylene wax (B) having an MFR (ISO 1133, 190 DEG C / 2.16 kg) of greater than 300 g / 10 min and / or a weight average molecular weight of from 1000 to 35000 and a Tm (DSC, ISO 11357 / 3) of from 120 to 135 DEG C.

The present disclosure relates to catalysts, polyethylene polymers, polymerization processes for making such polyethylene polymers, and films made therefrom. In various embodiments, the polymerization process includes dual catalyst polymerization, such as those performed by combining a base metallocene catalyst and a conditioned metallocene catalyst, where the base catalyst may optionally be supported in a first catalyst mixture, such as a solvent, and the conditioning catalyst may be added to the supported base catalyst at different ratios. Polymerization using a combination of a base catalyst and a conditioning catalyst, such as those described herein, can produce linear low density polyethylene copolymers having a medium degree of long chain branching, which can exhibit improved processability in the production of films. Furthermore, films made from such polymers may exhibit improved properties, such as excellent shrinkage.

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.

A thermoplastic polymer composition comprises a polyethylene polymer composition and a salt of bicyclo[2.2.1]heptane-2,3-dicarboxylic acid. The polyethylene polymer composition can have a Melt Relaxation Index of 2 or greater. A method for molding a thermoplastic polymer composition comprises the steps of (a) providing an apparatus comprising a die with an annular orifice, a means for blowing pressurized fluid into a tube exiting the die orifice, and a means for drawing and collecting the tube; (b) providing the thermoplastic polymer composition described above; (c) heating the thermoplastic polymer composition to melt the thermoplastic polymer composition; (d) extruding the molten thermoplastic polymer composition through the die to form a tube; (e) blowing a pressurized fluid into the tube to inflate the tube while simultaneously drawing it; (f) allowing the film to cool; and (g) collecting the film.

The present invention relates to a high-density vinyl polymer exhibiting high processability by using a mixed catalyst composition and a method for preparing the same, and provides a high-density polyvinyl polymer having excellent optical properties, excellent mechanical properties such as impact resistance and hardness, and excellent stretchability. The high density vinyl polymer of the present invention provides a polyvinyl polymer capable of biaxially stretching or simultaneous stretching.

Recyclable and dimensionally stable films for packaging include an oriented base film having a first layer containing a polar polymer and a second layer containing a stabilizing polyolefin, wherein the stabilizing polyolefin is selected from the group of an ethylene / norbornene copolymer having a norbornene content greater than 20 mol %, a polyethylene polymer having a density greater than 0.94 g / cm3, and a polypropylene homopolymer.

The present invention relates to a high-density vinyl polymer exhibiting high processability by using a mixed catalyst composition and a method for preparing the same, and provides a high-density polyvinyl polymer having excellent optical properties, excellent mechanical properties such as impact resistance and hardness, and excellent stretchability. The high density vinyl polymer of the present invention provides a polyvinyl polymer capable of biaxially stretching or simultaneous stretching.

The present disclosure relates to catalysts, catalyst systems, polyethylene polymers, polymerization processes for making such polyethylene polymers, and films made therefrom. In some embodiments, the catalyst compound is represented by formula (I) wherein M is Zr or Hf; r5 and R6 are each hydrogen; each of R1, R2, R3 and R4 is independently hydrogen or a substituted or unsubstituted C1 to C10 alkyl group; one pair of (1) R7 and R8, (2) R8 and R9, or (3) R9 and R10 is bonded to form a substituted or unsubstituted aromatic ring or a saturated ring fused to the indenyl ring shown in formula (I), and the remaining R7, R8, R9, and R10 are each hydrogen. In other embodiments, a process for producing a polyethylene composition is provided, comprising introducing ethylene and a C3-C40 alpha-olefin to a catalyst system in a reactor under first polymerization conditions, and forming the polyethylene composition.

The present disclosure relates to catalysts, catalyst systems, polyethylene polymers, polymerization processes for making such polyethylene polymers, and films made therefrom. In some embodiments, the unbridged catalyst compound is represented by Formula (II). M is a Group 4 metal. Each of R1, R2, R3, R4, R7, R8, R9, R10, R11, R14, R15, R15 ', R16, R16', R17, R17 ', R18, R18', R19, R19 ', R20, R20', R21, R21 ', R22 and R22' is independently hydrogen, a substituted or unsubstituted hydrocarbyl group, a substituted or unsubstituted heteroatom, or a substituted or unsubstituted heteroatom-containing group. Each X is independently a halide group, a substituted or unsubstituted hydrocarbyl group, a hydrogen group, an amino group, a substituted or unsubstituted alkoxy group, a sulfenyl group, a phosphino group, or a combination thereof, or two of the X are linked together to form a substituted or unsubstituted metal cyclization ring, or two of the X are linked to form a chelate ligand, a diene ligand, or an alkylidene group.

Polymer compositions containing at least one high molecular weight polyethylene polymer for producing gel extruded articles are disclosed. In one embodiment, a porous membrane having an excellent balance of properties including high porosity and high strength characteristics is produced. In one aspect, very thin films with high strength characteristics may be formed.

A thermoplastic polymer composition comprising a polyethylene polymer composition and a bicyclic [2.2.1]heptane-2,3-dicarboxylate. The polyethylene polymer composition may have a melt relaxation product of 50,000 or less. A method for preparing an injection-molded article includes the steps of: (a) providing the thermoplastic polymer composition as described above, (b) melting the thermoplastic polymer composition, (c) injecting the molten thermoplastic polymer composition into a mold cavity, (d) cooling the molten thermoplastic polymer composition, and (e) removing the injection-molded article from the mold cavity. A method for preparing a film includes the steps of: (a) providing the thermoplastic polymer composition as described above, (b) melting the thermoplastic polymer composition, (c) extruding the molten thermoplastic polymer composition through a slit die to form a film, (d) cooling the film, and (e) collecting the film.

A polymer composition comprises a polyolefin polymer and a salt of cyclopentylphosphonic acid. The polyolefin polymer can be a polypropylene polymer or a polyethylene polymer. The polymer composition exhibits fast crystallization rates, making it suitable for use in the production of thin articles with low haze levels. Polymer compositions containing a polyethylene polymer can exhibit preferential transverse direction crystalline lamellae growth, which is a desirable orientation in films and circular, center-gated injection molded parts.

A polymer composition for producing gel extruded articles is described. The polymer composition contains at least three different polyethylene polymers, namely a lower molecular weight polyethylene polymer, a mid-range molecular weight polyethylene polymer, and a high molecular weight polyethylene polymer. Combining the different polyethylene polymers in different ratios can optimize not only mechanical properties but improve processing.

This invention provides a polyethylene polymer that exhibits excellent mechanical properties and processability, as well as excellent dispersibility in resins such as propylene resins, amide resins, arylene sulfide resins, and polycarbonate resins, enabling improved mechanical properties when used in resin compositions. [Solution] A polyethylene polymer that satisfies any of the following characteristics (1) to (3). (1) In accordance with JIS K6922-2:1997, the melt flow rate (HLMFR) at a temperature of 190°C and a load of 21.6 kg is 0.01 to 5 g / 10 min. (2) The elution curve measured by gel permeation chromatography (GPC) shows a bimodal shape. (3); Acid value of 1 to 10 mg KOH / g in accordance with JIS K0070:1992.