20 results about "Polymethylpentene" patented technology

Provided is a versatile nonwoven fabric having excellent heat resistance and mechanical strength and applicable to applications requiring heat resistance; or a nonwoven fabric having excellent heat resistance, mechanical strength, and permeability. Moreover, provided is a separator for electrochemical elements having excellent heat resistance and mechanical strength. Furthermore, provided is a membrane support having excellent heat resistance, mechanical strength, and ion permeability.The nonwoven fabric of the present invention comprises a polymethylpentene component and a polyethylene component, wherein the polyethylene component is fused, and wherein the polymethylpentene component accounts for 30% by volume or more of the total fibers constituting the nonwoven fabric, and the polyethylene component accounts for 30% by volume or more of the total fibers constituting the nonwoven fabric. The separator for electrochemical elements of the present invention comprises the nonwoven fabric. Another nonwoven fabric of the present invention comprises core-sheath composite fibers having a polyethylene component as a sheath component and a polymethylpentene component as a core component, wherein the polyethylene component as the sheath component of the core-sheath composite fiber is fused, wherein the polymethylpentene component accounts for 30% by volume or more of the total fibers constituting the nonwoven fabric, and the polyethylene component accounts for 30% by volume or more of the total fibers constituting the nonwoven fabric, wherein a thickness of the nonwoven fabric is 100 μm or less, and the nonwoven fabric has a direction with a tensile strength per mass per unit area of 2.0 N / 5 cm-width or more, or wherein a ratio (L / D) of a fiber diameter (D, unit: μm) to a length (L, unit: μm) of the core-sheath composite fiber is 350 or more. The membrane support of the present invention comprises the other nonwoven fabric.

This invention relates to the field of insulating materials, and more particularly to a thermoplastic polyolefin insulating material, its preparation method, and its applications. The raw materials for preparing the thermoplastic polyolefin insulating material mainly include functional modified monomers and polyolefins. The polyolefins include poly4-methylpentene, and the functional modified monomers are unsaturated acid anhydrides and their analogues, including at least one of citrate anhydride, maleimide, and maleic anhydride. The thermoplastic polyolefin insulating material prepared by this invention exhibits excellent high-temperature resistance and high-temperature DC volume resistivity, making it suitable for long-term use under high temperature and high electric field strength conditions. It can be used in the field of cable insulation materials and has thermoplastic recyclability.

[Problem] An object of the present invention is to provide: a hollow fiber membrane having biocompatibility stable for a long time, and containing, as a main component, polymethylpentene having excellent gas permeability in the membrane; and a method of producing the hollow fiber membrane. [Solution] A hollow fiber membrane including polymethylpentene as a main component, and having a dense surface having a hydrophilic polymer immobilized therein, wherein the thickness of a layer containing the hydrophilic polymer is 1.0 nm or more and 25.0 nm or less.

The disclosure relates to antennas for use in satellite positioning systems and other wireless bands. An antenna may include a UV resistance treated Polymethylpentene housing having enhanced dielectric properties.

A cable capable of communicating large amounts of data while withstanding high heat conditions without the need for PFAS substances. The cable includes conductors encompassed by insulation. The insulation may include a non-PFAS fluoropolymer or materials such as polymethyl pentene or crosslinked polyalkene. The insulation may be encapsulated by a bedding layer, a shielding layer, a braid layer and a jacket. The insulation is designed to withstand temperatures of at least 125 degrees Celsius to ensure a high throughput of data even in demanding conditions.

The porous membrane contains, as a main component, a thermoplastic resin having a melting point of 180-300 DEG C inclusive, and has a tortoise-shell-like structure comprising a plurality of nodes and a plurality of fibrils. Alternatively, the porous film contains, as the main component, a thermoplastic resin having a melting point of 180-300 DEG C inclusive, and the compression ratio of the porous film in the thickness direction when a pressure of 2.5 N / mm2 is applied is 20% or less. The thermoplastic resin contains, for example, a polymethylpentene resin. When the cross-section of the porous film is observed, a plurality of nodes are included, for example, in the thickness direction.

The invention discloses a low-dielectric polyphenyl ether foaming material and a preparation process thereof, and relates to the technical field of foaming material preparation. Comprising the following raw materials: polyphenyl ether, modified polystyrene, modified polymethylpentene, silane modified hollow carbon microspheres, nano silicon dioxide, an antioxidant, a styrene-ethylene / butylene-styrene star block copolymer and a fluorine processing aid. The modified polymethylpentene is added, so that the dielectric constant and dielectric loss of the foaming material can be remarkably reduced, the high-frequency insulating property of the material can be enhanced, the heat resistance and dimensional stability of a system can be improved, the compression set of the material is reduced, and the deformation resistance is enhanced; the modified polystyrene, the polyphenyl ether and the silane modified hollow carbon microspheres have excellent synergistic adaptability, and endow the material with the comprehensive characteristics of lower dielectric, higher heat resistance and better toughness on the premise of not damaging the bubble pore structure.

The present invention provides an ultrasonic probe with a novel configuration, comprising an acoustic lens made of polymethylpentene with one concave surface, and an acoustic propagation medium in the concave space resulting from the concave surface. [Solution] The ultrasonic probe 10 includes an ultrasonic propagation medium 11e which is made of a gel-like urethane having an attenuation rate of 0.5 to 4 dB / mm, an acoustic impedance of 1.45 to 1.65 MRayl, and a sound velocity slower than the sound velocity of polymerylpentene. However, the attenuation rate is measured at an ultrasonic frequency of 10 MHz. The gel-like urethane is made of a mixture of soft urethane and a plasticizer with a specific gravity of 0.9 to 1.4 g / cc.

The application discloses a reflective film for liquid crystal display panel and a preparation method thereof. The reflective film has a thickness of 150-225 µm, and comprises at least one functional layer which is composed of polymethylpentene, hollow organic silica microspheres, a compatibilizer and polyethylene terephthalate (PET). The reflective film is prepared through processes such as melt co-extrusion, longitudinal and transverse stretching and heat setting, and has a double-layer or triple-layer structure. In the functional layer, the polymethylpentene and the hollow microspheres form a continuous phase and provide high light scattering, the compatibilizer improves the interfacial bonding force, and the PET provides mechanical strength and dimensional stability. The prepared reflective film has a reflectivity of more than 95% in the visible light band, low specific gravity, uniform light scattering, excellent mechanical properties, and is suitable for liquid crystal display backlight modules and display devices, significantly improves the backlight efficiency and display brightness, and has good industrialized preparation feasibility.

This invention relates to the field of capacitor film technology, and discloses a capacitor film and its preparation method. The capacitor film comprises a polypropylene film, a first poly(4-methyl-1-pentene) film disposed on the upper surface of the polypropylene film, and a second poly(4-methyl-1-pentene) film disposed on the lower surface of the polypropylene film. The polypropylene film comprises polypropylene resin, and the poly(4-methyl-1-pentene) film comprises an antioxidant and poly(4-methyl-1-pentene) resin. Based on the total amount of the capacitor film, the content of the polypropylene resin is 50-70 wt%, and the total amount of antioxidant and poly(4-methyl-1-pentene) resin in the first and second poly(4-methyl-1-pentene) films are each independently 15-25 wt%. This invention employs a biaxial stretching process, and the capacitor film obtained has excellent temperature resistance and compressive strength, uniform thickness, and good continuous film formation properties.

Asymmetric hollow fiber membranes comprising a porous substrate layer and a skin layer are described. The skin layer is a copolymer of polymethyl pentene and polypropylene. Gas separation articles made using such hollow fiber membranes, as well as methods of making and using such hollow fiber membranes and gas separation articles are also described.

To provide a food storage container that does not require an adhesive layer between polymer layers and has excellent stain resistance and moldability. [Solution] A container body having an opening, The container body has a laminated structure comprising a polymethylpentene-containing layer having a contact surface with food, and a polyolefin-containing layer directly disposed on the polymethylpentene-containing layer. At least a portion of the edge of the container body defining the opening is bent or curved, and the laminated structure is maintained at that edge. A food storage container in which the sum of the thickness of the polymethylpentene-containing layer and the thickness of the polyolefin-containing layer is 0.2 mm to 1.8 mm.

The present invention pertains to a melt-blown nonwoven fabric laminate obtained by laminating a first melt-blown nonwoven fabric containing polymethylpentene resin fibers and a second melt-blown nonwoven fabric containing polymethylpentene resin fibers, the weight per unit area of the whole laminate being 35 g / m2 to 130 g / m2 (inclusive), and the melt-blown nonwoven fabric laminate being obtained by laminating a first melt-blown nonwoven fabric containing polymethylpentene resin fibers and a second melt-blown nonwoven fabric containing polymethylpentene resin fibers. The difference between the weight per unit area of the first melt-blown nonwoven fabric and the weight per unit area of the second melt-blown nonwoven fabric before lamination is 15 g / m2 or more, and the peel strength is 0.10 N / 100 mm width or more.

An artificial gill for enabling a user to breathe when in an underwater environment is provided. The artificial gill comprises a membrane configured to allow permeation of gas through the membrane and prevent permeation of water through the membrane. The membrane is made from or comprises polymethyl pentene, PMP. The artificial gill comprises a gas reservoir at least partially enclosed by a first surface of the membrane for providing gas for a user to breathe. The artificial gill also comprises a water flow device configured to direct a flow of water over a second, opposite surface of the membrane.

The invention relates to the technical field of medical polymer materials, and provides a high-blood-compatibility PMP (polymethylpyrrolidone) membrane as well as a preparation method and application thereof in order to solve the technical problems of serious protein adhesion and poor blood compatibility caused by hydrophobicity of an existing PMP (poly-4-methyl-1-pentene) membrane. The preparation method comprises the following steps: firstly, carrying out plasma activation treatment on the PMP base film; then, a stable hydrophilic coating is constructed on the surface of the membrane through coordination of tannic acid and ferric ions and electrostatic adsorption of polyethyleneimine; and finally, carrying out low surface energy grafting modification by using methyl triethoxysilane. According to the invention, the PMP membrane with excellent anticoagulant property and high gas flux is successfully prepared through synergistic modification of the three steps. The hemolysis rate is less than or equal to 0.7%, the BSA adsorption quantity is less than or equal to 320 ng / cm < 2 >, the platelet adhesion quantity is obviously reduced, meanwhile, the oxygen flux retention rate is more than or equal to 92% (140-155 mL * min <-1 > * m <-2 >), and the core performance requirements of ECMO and other medical equipment on the membrane material are completely met. The method is simple in process, easily available in raw materials and suitable for large-scale production.

A pleated multilayer air filter assembly includes a primary filter layer and a prefilter layer bonded to and co-pleated with each other. The primary filter layer comprises meltblown electret fibers. The prefilter layer comprises meltspun spunbond electret fibers having a radially outer surface comprising polymethylpentene. A ratio of an effective fiber diameter of the meltspun fibers of the primary filter layer to an effective fiber diameter of the meltblown fibers of the primary filter layer is at least 1.5.

Provided are: a non-woven fabric which has excellent heat resistance and mechanical strength and is highly versatile, and which is suitable for use in applications requiring heat resistance; and a separator for electrochemical elements, which comprises the non-woven fabric, and a membrane support. The non-woven fabric according to the present invention contains a polymethylpentene component and a polyethylene component, the polyethylene component having been fused, and the polymethylpentene component and the polyethylene component each account for 30 vol% or more of the entire non-woven fabric constituting fibers. Another non-woven fabric according to the present invention contains core-sheath composite fibers having a polyethylene component as a sheath component and a polymethylpentene component as a core component, the polyethylene component has been fused, the polymethylpentene component and the polyethylene component each account for 30 vol% or more of the entire non-woven fabric constituting fibers, and the thickness of the non-woven fabric is 100 [mu] m or less. The core-sheath composite fiber has a direction in which the tensile strength per unit gram weight is 2.0 N / 5 cm width or more, or the ratio of the length to the fiber diameter of the core-sheath composite fiber is 350 or more.

The present invention provides a polymethylpentene-based meltblown nonwoven fabric laminate in which surface fuzzing is suppressed and interlayer delamination does not occur or is unlikely to occur. [Solution] A laminate of meltblown nonwoven fabrics is formed by laminating a first meltblown nonwoven fabric made of polymethylpentene resin fibers and a second meltblown nonwoven fabric made of polymethylpentene resin fibers, wherein the basis weight of the entire laminate is 35 g / m². 2 More than 130g / m 2 The difference in basis weight between the first melt-blown nonwoven fabric and the second melt-blown nonwoven fabric before lamination is 15 g / m². 2 The above describes a meltblown nonwoven fabric laminate having a peel strength of 0.10 N / 100 mm width or more.