344 results about "Fluorinated ethylene propylene" patented technology

A thin-wall PTFE (polytetrafluoroethylene) tube in the form of a tube of porous expanded PTFE film wherein the porous PTFE film has a microstructure containing a multiplicity of fibrils. The thin-wall tube is used in a non-porous embodiment as the balloon portion of a balloon catheter. The thin-wall tube is not elastomeric; however, because of the thinness, strength and flexibility of the tube, it may be inserted into a body conduit in a collapsed state and then deployed from a catheter and inflated up to the maximum diameter of the thin-wall tube. The porous PTFE film is provided with a continuous layer of adhesive to provide the non-porous tube; the adhesive is preferably a thermoplastic and more preferably a thermoplastic fluoropolymer such as fluorinated ethylene propylene.

Articles comprising an expanded polytetrafluoroethylene membrane having serpentine fibrils and having a discontinuous coating of a fluoropolymer thereon are provided. The fluoropolymer may be located at least partially in the pores of the expanded fluoropolymer membrane. In exemplary embodiments, the fluoropolymer is fluorinated ethylene propylene. The application of a tensile force at least partially straightens the serpentine fibrils, thereby elongating the article. The expanded polytetrafluoroethylene membrane may include a microstructure of substantially only fibrils. The articles can be elongated to a predetermined point at which further elongation is inhibited by a dramatic increase in stiffness. In one embodiment, the articles are used to form a covered stent device that requires little force to distend in the radial direction to a first diameter but is highly resistant to further distension to a second diameter (stop point). A large increase in diameter can advantageously be achieved prior to reaching the stop point.

A method of making an tubular intraluminal graft in the form of a tubular diametrically adjustable stent having a tubular covering of porous expanded polytetrafluoroethylene which is less than 0.10 mm thick. The covering may be on the exterior surface of the stent, or on the interior surface of the stent, or both. The covering may be affixed to the stent by an adhesive which is preferably fluorinated ethylene propylene.

A matrix band for dental applications comprising a base material and a coating. The base material has an outer surface and a tooth contact surface as well as a perimeter. The coating is applied to the tooth contact surface and extends to the perimeter of the tooth contact surface. The coating is a fluorinated ethylene propylene, polytetrafluoroethylene and polyether sulfone.

The invention relates to a condensation washing method for fluorinated ethylene-propylene resin. An emulsion polymerization method is adopted for preparing luorinated ethylene-propylene resin polymerization emulsion, then, the fluorinated ethylene-propylene resin is obtained through still standing, dilution, stirring condensation and washing, and a chemical condensation mode can also be used as an auxiliary mode in the stirring condensation process. The mechanical condensation and the chemical condensation are combined in the condensation washing method provided by the invention, the condensation effect is excellent and is obviously superior to that of the traditional condensation method, the obtained fluorinated ethylene-propylene resin has large grain diameter and high volume density, fluorinated ethylene propylene (FEP) plastics can be favorably and further processed, and in addition, the method has the advantages that the operation is simple and convenient, the condition is mild, and the method is suitable for industrial large-scale application.

Aerosol solution compositions intended for use with a pressurized metered dose inhaler, comprising glycopyrronium bromide and formoterol, or a salt thereof or a solvate of said salt, optionally in combination with one or more additional active ingredients, and stabilized by a selected amount of a mineral acid, exhibit improved stability when contained in a can internally coated by a resin comprising a fluorinated ethylene propylene (FEP) polymer.

A fluorinated ethylene-propylene polymeric membrane comprising a copolymer comprising 2,3,3,3-tetrafluoropropene and vinylidene fluoride is disclosed. The fluorinated ethylene-propylene polymeric membranes of the invention are especially useful in gas separation processes in air purification, petrochemical, refinery, and natural gas industries.

A high-power low-resistance electromechanical cable constructed of a conductor core comprising a plurality of conductors surrounded by an outer insulating jacket and with each conductor having a plurality of wires that are surrounded by an insulating jacket. The wires can be copper or other conductive wires. The insulating jacket surrounding each set of wires or each conductor can be comprised of ethylene tetrafluoroethylene, polytetrafluoroethylene, polytetrafluoroethylene tape, perfluoroalkoxyalkane, fluorinated ethylene propylene or a combination of materials. A first layer of a plurality of strength members is wrapped around the outer insulating jacket. A second layer of a plurality of strength members may be wrapped around the first layer of a plurality of strength members. The first and/or second layer of strength members can be made of single wires, synthetic fiber strands multi-wire strands, or rope. If either or both layers are made up of synthetic fiber, then the synthetic fibers may be surrounding and encapsulated by an additional insulating and protective layer.

The invention discloses a high temperature wear resistance antistatic coating. Raw materials of the coating comprise polyphenylene sulfide resin, polyester resin, epoxy resin, teflon, fluorinated ethylene-propylene resin, carboxyl powdered nitrile rubber, amino resin, carbon nanotube, nano-zinc oxide, carbon black, polyethylene glycol, sorbitan fatty acid ester, a conducting polymer 3,4-ethylenedioxythiophene dispersion, methyl ethyl ketoxime, water, a silane coupling agent containing an amino-group, an antifoaming agent, a thickening agent, a leveling agent and a coalescing agent. The high temperature wear resistance antistatic coating has excellent antistatic property and shock resistance and good high temperature wear resistance.

Release liner forming structures and methods of making and using the same. The methods of making the release liner include thermoforming and sheet bending. The flexible release liner may be used in conjunction with a rigid, transparent supporting surface. The release liner may be developed from a flexible sheet formed into a deformable resin fluid vat. A release layer, and additional structure if desired, can be formed of or include plastic, such as polyolefin or fluoropolymer. In some instances, the polyolefin is, or includes, polymethylpentene or a fluropolymer is fluorinated ethylene propylene. The optical and other properties of the release layer can be altered with treatments and other materials to, for example, reduce over-penetration of a light beam or deform a release layer.

The invention relates to a coating composition, a preparation method and an application thereof. The coating composition comprises (a) priming paint which consists of (i) fluor resin, (ii) inorganic filler and (iii) bonding resin, and (b) surface layer coating. The fluor resin is selected from polytetrafluoroe thylene resin, tetrafluoroethylene-perfluorinated alkey vinye copolymer, fluorinated ethylene propylene copolymer and combinations thereof, with a content of 30 to 70 parts by weight, calculated by the total solid weight of the priming paint; the inorganic filler has a grain size of 0.1 to 50 microns and a content of 5 to 30 parts by weight, calculated by the total solid weight of the priming paint; the bonding resin is selected from daiamid-imide copolymer, polyimide, polyphenylene sulfide, polyethersulfone and combinations thereof, with a content of 10-40 parts by weight, calculated by the total solid weight of the priming paint; the surface layer coating comprises (i') tetrafluoroethylene-perfluorinated alkey vinye copolymer with a content of 80-100 parts by weight, calculated by the total solid weight of the surface layer coating; (ii') assisted film forming organic resin with a content of 0-20 parts by weight, calculated by the total solid weight of the surface layer coating; and (iii') mica flashlight powder with a content of 0-3 parts by weight, calculated by the total solid weight of the surface layer coating.

An electrical submersible pump (ESP) power cable for use in oil wells is provided, comprising at least two electrical conductors, a first fluoropolymer layer surrounding each of the at least two electrical conductors, an outer metal armouring, wherein the first fluoropolymer layer surrounding each of the at least two electrical conductors is composed of at least one fluoropolymer chosen among ETFE (ethylene tetrafluoroethylene copolymer), PFA (perfluoroalkoxy copolymer), FEP (fluorinated ethylene propylene copolymer) and/or mixtures thereof.

The invention discloses a cross-linked fluoroplastic heat-shrinkable tube and a preparation method thereof and relates to a plastic heat-shrinkable tube. The cross-linked fluoroplastic heat-shrinkable tube is made of cross-linked fluoroplastic, and the cross-linked fluoroplastic is prepared from components of raw materials in parts by weight as follows: 50-95 parts of thermoplastic fluoroplastic, 1-8 parts of an assistant crosslinker, 1-5 parts of pigments, 1-10 parts of a fire retardant and 1-20 parts of other aids. Compared with heat-shrinkage tubes made of thermoplastic materials such as FEP (fluorinated ethylene propylene), PFA (polytetrafluoroethylene) and the like, the cross-linked fluoroplastic heat-shrinkable tube has higher expansion rate and is wider in use range, better in radiation resistance and capable of bearing 50 or more Mrad of radiation.

The present invention discloses an electric cable insulation material, which comprises, by weight, 60-80% of fluorinated ethylene propylene, 10-12% of a butyl rubber, 10-12% of an ethylene propylene diene monomer, 1-2% of a self-adhesive butyl semi-conductive tape, 5-10% of an organic solvent, 2-3% of a fluorine-containing diacyl peroxide, 2-3% of polyphenylene sulfide, 2-3% of polytetrafluoroethylene powder, and 1-2% of alkali-free glass fiber. The prepared electric cable insulation material provides more excellent temperature tolerance, insulation property and flame resistance compared with other existing electric wire and electric cable materials, and can be widely used in petroleum, chemical engineering, medicine and other corrosive chemical industries.

The invention relates to a dilatation catheter used for treatment, in particular to an antibacterial PTCA dilatation catheter which comprises a sacculus, a far-end tube body part, a near-end tube body part that are sequentially connected and communicated with each other. The antibacterial PTCA dilatation catheter is prepared by the steps of: mixing one, two or three in ciprofloxacin powder, rifampicin powder and metal tungsten powder according to a certain proportion; fully mixing the prepared antibacterial powder with plastic master batch for milling; and finally, precisely extruding and blow molding for shaping, wherein the antibacterial powder accounts for 1-50% of the total weight ratio of the dilatation catheter, and the plastic master batch is prepared by one in poly-fluorinated ethylene propylene, polyfluortetraethylene, polyvinyl chloride, polyethylene, polyurethane, fluoro-polymer and thermoplastic elastomer. The antibacterial PTCA dilatation catheter has simple production technique, realizes long-acting antibacterial function, and greatly improves the safety factor of operation.

The invention discloses a resin tank for a digital light processing (DLP) photocuring 3D printer. A periphery mounting face is formed at the bottom of a box frame, a soft cushion plate is arranged under the periphery mounting face and fixedly attached to the periphery mounting face, and a fluorinated ethylene propylene copolymer thin film or a teflon thin film is clamped between the periphery mounting face and the cushion plate. The box frame can be lifted relative to a bottom plate through external force and can be reset in time after the external force is gone, an opening is formed in the bottom plate and located in the box frame, and a transparent sealing plate covers the opening and is fixed through a cambered pressing frame. When the box frame is kept in a downward-pressing state through the acting force of spiral springs, part of the cambered pressing frame extends into the box frame, and the fluorinated ethylene propylene copolymer thin film or the teflon thin film is tensioned. The technical purpose that the bottom of the resin tank can be conveniently stripped from cured resin in the working process of the DLP photocuring 3D printer is achieved, and the printing effect is improved.

The invention discloses a microemulsion polymerization method of perfluoroethylene and hexafluoropropene copolymer, which uses monomer medium liquefied hexafluoropropene as organic phase, adds monomer medium liquefied hexafluoropropene, emulsifier and co-emulsifier into water, to form O/W type microemulsion, feeds perfluoroethylene and hexafluoropropylene initial mixture gas and complement mixture gas, uses oil-soluble free radical initiator to initialize reaction, after the reaction, heats to separate and recover liquefied hexafluoropropene, discharges water, heats obtained polymer powder, to remove non-decomposed initiator, decomposition product, and residual water and foreign materials. The product powder of the invention has uniform and small size, non block. And the invention uses liquefied hexafluoropropene as organic phase to avoid organic solvent pollution on product and environment.

This invention discloses a method for condensing and washing perfluoroethylene-perfluoropropylene copolymer prepared by emulsion polymerization. The method comprises: (1) adding 1-10 deg.C deionized water to perfluoroethylene-perfluoropropylene copolymer emulsion, stirring, demulsifying, and washing the precipitate with 40-80 deg.C deionized water for 2-6 times (1-5 min for each time). The method can largely increase the equipment productivity, lower the consumption of pure water, save the raw materials, and shorten the treatment period.

The invention discloses a bonding and curing process of an expanded polytetrafluoroethylene membrane, comprising: using FEP (fluorinated ethylene propylene) emulsion as a binder, brushing the FEP emulsion among a plurality of stacked e-PTFE (expanded polytetrafluoroethylene) porous membrane, and bonding the plurality of porous membranes into a sheet of certain thickness to obtain a membrane composite; fixing the membrane composite between two plate-frame fixing clamps; placing the membrane composite along with the clamps in an oven, and heating at 65-250 DEG C in a segmental gradient manner; curing at high temperature and then cooling.By using the FEP emulsion as the binder, the problem of bonding difficulty is solved; by using segmental gradient heating, the problem of removing an emulsifier in the binder is effectively solved; by designing the plate-frame fixing clamps, fixing the membrane composite between the two plate-frame fixing clamps and carrying out segmental gradient heating and high-temperature curing, the problem that the e-PTFE porous membranes experience micropore loss after being heated is solved effectively.

The invention discloses a corrosion-resistant inflaming retarding heat-proof cable sheath material which comprises the following raw materials in parts by weight: 19-21 parts of fluorinated ethylene propylene copolymer (FEP), 4-6 parts of polytetrafluoroethylene, 20-23 parts of polyphenylene sulfide (PPS), 7-9 parts of boron fiber, 4-6 parts of nylon fiber, 10-13 parts of short glass fiber, 0.5-1.2 parts of dimethyl phthalate (DMP), 9-11 parts of kaolin, 4-6 parts of mica, 3-5 parts of quartz, 10-12 parts of nano-montmorillonite, 3-4 parts of ammonium phosphate, 1-2 parts of hydrated zinc borate, 0.5-1.5 parts of bis stearamide, 4-6 parts of silicone oil, 1-2 parts of a titanate coupling agent NDZ-101 and 2-3 parts of castor acid barium. The corrosion-resistant inflaming retarding heat-proof cable sheath material has excellent corrosion-resistant performance and inflaming retarding heatproof performance, and is good in processability and excellent in impact strength.

The invention relates to a producing method of a piezoelectric electret film, and the producing method is as follows: fluorinated ethylene propylene copolymer films and polytetrafluoroethylene films are alternately laminated together, and then placed on a substrate, after the alternate lamination, two outermost layers are the polytetrafluoroethylene films; a latticed pressing plate is arranged on an outermost layer t polytetrafluoroethylene film opposite the substrate, pressure is applied to the pressing plate, the alternately laminated structure of the fluorinated ethylene propylene copolymer films and the polytetrafluoroethylene films is heated, after cooling, the pressing plate and the substrate are removed to obtain the piezoelectric electret film provided with micropores in the middle. In the production process of the piezoelectric electret film, through selection of latticed pressing plates with different specifications, such as regulation of mesh net opening mesh number, wire diameter, shape and other parameters and thermal bonding process parameter of the pressing plates, the fine adjustment of microporous structure of the piezoelectric electret film can be realized, and the producing method is strong in practicability, and can be widely popularized and applied. In addition, the invention also relates to the piezoelectric electret film produced by the producing method.