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7528221 |
Modified polytetrafluoethylene molded article and process for manufacture thereof
It is an object of the present invention to obtain a PTFE molding excellent in flexing resistance without decreasing the tensile strength and tensile elongation. The present invention is a modified...
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7524445 |
Method for making ePTFE and structure containing such ePTFE, such as a vascular graft
A method for making a vascular graft includes providing a PTFE green tube extrudate which is un-sintered, and then initially expanding the un-sintered extrudate to produce an initial node and...
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7521010 |
Fluoropolymer barrier material
A novel densified fluoropolymer article is described which has a water vapor permeation of about 0.015 g-mm/m 2 /day or less, and preferably has a matrix tensile strength of at least 10,000 psi in...
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7491353 |
Boreable plain bearing material
A bearing, plastic bearing material, and a method for the production thereof are described. The bearing comprises a continuous consolidated bearing material layer impregnated into a porous layer,...
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7390448 |
Spinning low fluorosurfactant fluoropolymer dispersions
A process for dispersion spinning non-melt-processible fluoropolymer fiber in which a mixture of an aqueous dispersion of non-melt-processible polytetrafluoroethylene or modified...
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7347960 |
Dispersion spinning core-shell fluoropolymers
A process is disclosed for dispersion spinning non-melt-processible fluoropolymer fiber in which a mixture of an aqueous dispersion of non-melt-processible fluoropolymer particles and an aqueous...
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7291696 |
Composition and associated method
Provided is a fluorine substituted oligomeric or polymeric ester including the reaction product of a fluorine substituted acrylate or a fluorine substituted methacrylate; an unsaturated anhydride;...
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7226969 |
Aerogel/PTFE composite insulating material
A material comprising aerogel particles and a polytetrafluoroethylene (PTFE) binder is formed having a thermal conductivity of less than or equal to 25 mW/m K at atmospheric conditions. The...
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7173094 |
Moldings of fluororubbers and process for their production
Moldings of fluoro rubbers produced by crosslinking a tetrafluoroethylene/propylene copolymer or a tetrafluoroethylene/propylene/vinylidene fluoride copolymer, which have metal contents of 1.5% by...
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7060210 |
Method of processing colloidal size polytetrafluoroethylene resin particles to produce biaxially-oriented structures
This invention involves forward integration of the art paste extrusion process by adding a step to the processing sequence to change the uniaxially-oriented art form to a desirable planar...
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7033529 |
Plain bearing provided with a friction coating and method for making same
A high-performance plain bearing provided with a friction coating including a bronze layer whereof the pores are filled with a PTFE-type fluoroplastic paste filled with molybdenum bisulphide. The...
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6918411 |
Ribbon and method for production thereof
A method and a device for the production of a ribbon are provided. The method may be performed on a narrow fabric needle loom and may include repeating the following steps: picking a weft thread (...
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6899932 |
Polytetrafluoroethylene molded product in block form and method for production thereof
A block-shaped baked molded article having little block deformation amount is obtained in order to reduce a loss of materials until a stable film or sheet can be cut from a block-shaped molded...
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6890395 |
Medical device formed of ultrahigh molecular weight polyolefin
Medical devices having at least a component, such as a catheter balloon, stent cover and vascular graft, formed of ultrahigh molecular weight polyolefin, such as ultrahigh molecular weight...
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6878320 |
Auxetic materials
An auxetic polymeric material is manufactured in a filamentary or fibrous form. The auxetic polymeric material has a negative Poisson ratio so that it has the property of expanding or contracting...
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6863852 |
Fluoropolymer extrusions based on novel combinations of process parameters and clay minerals
A process for extruding of products from fluoropolymers preferably shaped as rods or tubes which have unique physical and other properties resulting from the addition of nanoparticles under unique...
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6780360 |
Method of forming a PTFE insulation layer over a metallic conductor and product derived thereform
A method of forming a polytetraflouroethylene (PTFE) insulation layer over a metallic conductor of a processed product includes the steps of extruding PTFE over a metallic conductor, and heating...
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6761786 |
Process of making a balloon for an intraluminal catheter
Medical devices such as catheter balloons, stent covers and vascular grafts formed of ultrahigh molecular weight polyethylene. The devices are formed from polyethylene that has been processed so...
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6759004 |
Process for forming microporous metal parts
A metal injection-molding feedstock is heated and plasticized. Supercritical carbon dioxide is injected into the feedstock to form micropores when the pressure is reduced and a parts mold is...
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6676880 |
PTFE seal fabrication method
A PTFE seal and method of fabrication therefor includes preparing a mixture of PTFE resin powder and a susceptor material which is then compacted and sintered by exciting the susceptor material...
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6643906 |
Friction member, and vibration wave device and apparatus using friction member
In a method of manufacturing a friction member used for a vibration wave driving apparatus including a vibration member, a contact member which is brought into frictional contact with the vibration...
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6627277 |
Polytetrafluoroethylene tubing and extruder for the production thereof
In an extruder for producing a polytetrafluoroethylene tube having a minimum thickness deviation by extruding a polytetrafluoroethylene paste through an annular portion formed by a core pin ( 30 )...
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6616876 |
Method for treating expandable polymer materials
The invention is directed to methods involving rewetting of expandable polymers with a wettable liquid to allow for enhanced expansion at or below room temperature without breakage, and in some...
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6605119 |
Method of making large diameter vascular prostheses and vascular prosthesis made by said method
A method is disclosed for making vascular prostheses from ePTFE said prostheses having a diameter which is larger, and a wall thickness which is smaller than previously achievable using ram...
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6596369 |
Flat semi-finished product, component made therefrom and process for the production thereof
A flat semi-finished product includes a filled fluoroplastics substrate in the form of a sheet, which is coated at least partially on at least one surface with a soft, thin coating of...
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6582628 |
Conductive melt-processible fluoropolymer
A method for producing an electrically conducting melt-processible fluoropolymer comprising pulverizing a composition of (a) carbon aggregate and (b) coagulum particles of aqueous dispersion...
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6395208 |
Method of making an expandable fluoropolymer device
A method of making a radially expandable device having a body constructed of a generally inelastic, expanded fluoropolymer material. The body is deployable upon application of a radial expansion...
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6392138 |
Non-perfluoro fluorine-containing resin molded article having low-temperature heat-sealing property
An excellent low temperature heat sealing property is imparted to a surface of a non-perfluoro fluorine-containing resin molded article having F/C of not more than 1.8. A non-perfluoro...
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6376647 |
Fluoropolymer powder and process for preparing the same
Process for producing fluorine-containing polymer powder which comprises densifying fluorine-containing polymer raw powder with rolls under conditions for permitting its specific gravity to achieve...
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6358460 |
Method for tip forming peelable PTFE tubing
Methods are disclosed for producing multi-layer peelable sheaths having formed tips, for use as medical introducer devices, e.g., sheaths for inserting a catheter or the like into a patient. The...
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6352660 |
Preparation of composite fibers and diaphragms
Composite fibers useful for preparing diaphragms are prepared by (a) mixing a PTFE or PTFE copolymer dispersion or powder with a finely divided inorganic material and a fiber forming material, (b)...
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6309583 |
Composite coatings for thermal properties
This invention relates to processes for the formation of composite layers containing insoluble particles in metal matrices onto bodies to achieve enhanced thermal properties.
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6309574 |
Extrusion of high molecular weight polymers
A method for manufacturing an extrudable product including the steps of (a) providing an apparatus including an extruder having at least one rotor with first grooves, at least one stator with...
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6306921 |
Foamed beads of polyester resin
Foamed beads of polyester resin having rheological and crystallizability characteristics suitable for the preparation of foamed articles by sintering beads in a mold heated with superheated steam...
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6287497 |
Molded polytetrafluoroethylene article and method of production thereof
A large molded article block free from distortion and residual stress can be obtained by means of a method of producing a polytetrafluoroethylene molded article by compression-molding a...
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6270707 |
Manufacturing method of a highly conductive polytetrafluoroethylene sheet
This invention concerns a method of manufacturing a highly conductive polytetrafluoroethylene sheet; a method of manufacturing a highly conductive unsintered polytetrafluoroethylene sheet: and a...
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6267834 |
Process of manufacturing a radially expandable PTFE tape-reinforced vascular graft
A method for improving the radial enlargeability and other properties of tape-reinforced tubular vascular graft formed of sintered fluoropolymer(s), such as expanded, sintered PTFE. Broadly, the...
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6261497 |
Method for preparation of controlled pore glass-synthetic resin membrane
Particulate inorganic pore material, e.g., controlled pore glass (CPG) embedded porous synthetic resin membrane is prepared by mixing inorganic pore material and an aqueous resin, preferably...
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6238605 |
Low-fibrillation moulded bodies
The invention relates to a process for the production of a low-fibrillation moulded body containing polytetrafluorethylene. The process is characterised in that a pre-moulded body of...
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6218000 |
Microporous polytetrafluoroethylene (PTFE) bodies with filler
A membrane of microporous, for example stretched, PTFE is filled with particles having a size in the nanometer range. By filling with, for example, TiO 2 , the abrasion resistance of the membrane...
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6203735 |
Method of making expanded polytetrafluoroethylene products
A method of shaping three-dimensional products by manipulating an expanded polytetrafluoroethylene tubular body into a desired three-dimensional conformation. The present invention entails radially...
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6197234 |
Method for increasing the anti-wettability of a body
To increase the anti-wettability of a body vis a vis a fluid the body is subjected in a treatment enclosure to a post-discharge nitrogen plasma. A fluorinated vapor is fed into the plasma on the...
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6174473 |
Paste extrusion method
The present invention relates to a process of paste extruding lubricated PTFE fine powder in an extrusion device by forcing the lubricated PTFE fine powder through the extrusion device and out of...
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6103172 |
Method of preparaing a porous polytetrafluoroethylene membranne
The present invention relates to microporous and ultrafine polytetrafluoroethylene (PTFE) membranes of high permeability, excellent mechanical strength, and good chemical inertness, and to methods...
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6099791 |
Methods of manufacture of multiaxially oriented fluoropolymer films
Porous fluoropolymer films, such as PTFE films, formed by a method including the steps of (a) forming a fluoropolymer (e.g., PTFE) paste, (b) extruding, calendaring, or otherwise processing the...
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6099774 |
Process for non-free flowable molding powders of modified polytetrafluoroethylenes
Non-free flowable, non-dusting molding powders with a bulk density of more than 450 g/l are obtained when a suspension polymer of tetrafluoroethylene with a content of 0.01 to 1% by weight of units...
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6054085 |
Membrane
A method of producing a membrane comprises providing a solution containing a plurality of polymers in a non-aqueous liquid solvent, at least one of the polymers (hereinafter referred to as the...
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6019920 |
Granular-type modified polytetrafluoroethylene dispersions and fused articles prepared therefrom
An aqueous dispersion of modified granular PTFE particles is sprayed or cast to form a sheet. The sheet is then dried and the modified granular particles fused together to form an open network of...
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5980799 |
Methods of making controlled porosity expanded polytetrafluoroethylene products and fabrication
A method of forming porous articles with a varying pore distribution by extrusion from a billet with a varying lubricant distribution. A single-polymer polytetrafluoroethylene is extruded and then...
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5965074 |
Continuous paste extrusion method
Paste extrusion of lubricated PTFE fine powder is carried out by using the extrusion head of the extruder as the ram for forcing the powder through the extrusion orifice in the extrusion head, i.e....
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