Abstract:
A method for the preparation of fluoropolymer powdered materials is disclosed. A suspension of solid fluoropolymer particles in a liquid carrier, preferably water, is frozen and the frozen carrier is then removed by sublimation at sub-atmospheric pressure to produce a dry powder of fluoropolymers particles.
Abstract:
A process for stabilizing aqueous dispersions of polytetrafluoroethylene (PTFE) or co- and terpolymers of PTFE by adding a macromolecular species directly to the aqueous dispersion. Surprisingly, it has been observed that after the macromolecular species has been added to the dispersion of PTFE or co- and terpolymers of PTFE, the dispersions are very stable, do not readily coagulate, and remain stable even when subjected to freeze/melt cycles. The amount of macromolecular species which may be added may vary from about 0.1 wt. % to about 20.0 wt. %, for example, and suitable macromolecular species include polyacrylic acid (PAA), polyvinylalcohol (PVOH), polyethyleneimies (PEI), and polyethylene glycol (PEG), and others. The present method is particularly effective for stabilizing commercially available “unstabilized” aqueous dispersions of PTFE or co- and terpolymers of PTFE which do not include a surfactant or are substantially free of surfactant.
Abstract:
This is an Improved Golf Practice Device usable for practice under replicated golfing conditions. It relates to a golf practice device with a retrievable tethered ball and which is usable for practice under replicated golfing conditions. It is made of a golf club grip; an inner dowel shaft for grip; an insert in the dowel shaft; a manner for retaining such as an insert; a flexible cord, rope or the like such as a parachute cord; a manner for retaining cord in shaft such as a washer and knot in cord; a spherical resistance device such as a whiffle ball or the like wherein the device provides a training aid for a golfer to improve his normal golf swing, cadence, and timing rhythm throughout the golf swing using all of one's body parts, the leg movement, the arms, the wrists, everything when one swings through the stroke.
Abstract:
A method for the preparation of fluoropolymer powdered materials is disclosed. A suspension of solid fluoropolymer particles in a liquid carrier, preferably water, is frozen and the frozen carrier is then removed by sublimation at sub-atmospheric pressure to produce a dry powder of fluoropolymers particles.
Abstract:
A method for the preparation of a modified fluoropolymer powdered material is disclosed. A suspension of solid fluoropolymer particles together with PTFE particles in an aqueous carrier, is frozen and the frozen carrier is then removed by sublimation at sub-atmospheric pressure to produce a dry powder of modified fluoropolymer particles.
Abstract:
A method for the preparation of a modified fluoropolymer powdered material is disclosed. A suspension of solid fluoropolymer particles together with PTFE particles in an aqueous carrier, is frozen and the frozen carrier is then removed by sublimation at sub-atmospheric pressure to produce a dry powder of modified fluoropolymer particles.
Abstract:
Blended fluoropolymer compositions are provided, in which a liquid dispersion of a first fluoropolymer is blended with a liquid dispersion of a second fluoropolymer. The first fluoropolymer may be polytetrafluoroethylene (PTFE), such as a low molecular weight PTFE (LPTFE) in the form of an aqueous dispersion having a mean particle size of less than 1.0 microns (μm) and a first melt temperature (Tm) of 332° C. or less. The second fluoropolymer may be a melt processable fluoropolymer (MPF), such as methylfluoroalkoxy (MFA), fluorinated ethylene propylene (FEP), or perfluoroalkoxy (PFA), for example, in the form of an aqueous dispersion having a mean particle size of less than 1.0 microns (μm). When the blended fluoropolymer composition is dried, a crystal structure representing a true alloy of the fluoropolymers is formed, having melt characteristics that differ from those of the individual fluoropolymers.
Abstract:
A method for repairing a damaged or corroded tong jaw having a jaw root and an original seating component. The method includes the steps of: (a) machining away corroded or damaged portions of the original seating component; (b) machining into a non-damaged portion of the original seating component and/or jaw root, thereby forming a machined base configured to receive a new seating component, the new seating component including a feature adapted for engaging the machined base. The new seating component is then connected onto the machined base.
Abstract:
Blended fluoropolymer compositions are provided. In one embodiment, a liquid dispersion of a first fluoropolymer is blended with a liquid dispersion of a second fluoropolymer. The first fluoropolymer may be polytetrafluoroethylene (PTFE), such as a low molecular weight PTFE (LPTFE) that has been polymerized via a dispersion or emulsion polymerization process, and which has not been agglomerated, irradiated, or thermally degraded. The LPTFE may be in the form of an aqueous dispersion, having a mean particle size of less than 1.0 microns (μm), with the LPTFE having a first melt temperature (Tm) of 332° C. or less. The second fluoropolymer may be a melt processible fluoropolymer (MPF), such as methylfluoroalkoxy (MFA), fluorinated ethylene propylene (FEP), or perfluoroalkoxy (PFA), for example, in the form of an aqueous dispersion, and having a mean particle size of less than 1.0 microns (μm). Blending of the dispersions facilitates interaction of the LPTFE and MPF on a submicron level to facilitate intimate blending such that, when the blended fluoropolymer composition is dried, a crystal structure representing a true alloy of the fluoropolymers is formed, having melt characteristics that differ from those of the individual fluoropolymers. The blended fluoropolymer composition may be used to provide a coating having improved impermeability, stain resistance, abrasion resistance, smoothness, and higher contact angles.
Abstract:
Fluoropolymer particles are subjected to high energy treatment so as to change the chemical functionality of the particle surfaces and thereby change the surface characteristics of the particles. These characteristics improve the usefulness of these particles and can make them highly dispersible, even in water. The surface treated fluoropolymer particles are subject to a chemical crosslinking process, or alternatively, are subject to a high energy treatment process, and may optionally be pretreated with a macromolecular chemical species prior to the foregoing processes. The high energy treatment can be used to both surface treat the fluoropolymer particles and in some embodiments, may also cause chain scission of the fluoropolymers to thereby reduce the molecular weight of the fluoropolymer particles. The surface treated fluoropolymer particles can be used to form fluoropolymer coatings on various substrates.