Abstract: A polyurethane or polyurea coating composition for use in protecting a leading edge substrate on an airfoil, such as aircraft wings, rotor blades and propeller blades, against liquid or solid particle erosion, the composition made from an isocyanate-terminated prepolymer and curing agents, such as polyaspartic esters, aldimines and ketimines.

Abstract: A polyurethane or polyurea coating composition for use in protecting a leading edge substrate on an airfoil, such as aircraft wings, rotor blades and propeller blades, against liquid or solid particle erosion, the composition made from an isocyanate-terminated prepolymer and curing agents, such as polyaspartic esters, aldimines and ketimines.

Abstract: A polyurethane or polyurea coating composition for use in protecting a leading edge substrate on an airfoil, such as aircraft wings, rotor blades and propeller blades, against liquid or solid particle erosion, the composition made from a polyisocyanate and curing agents, such as polyaspartic esters, aldimines and ketimines, polyamines and polyols or mixtures thereof with optional flatting agent for matte coatings.

Abstract: A method of applying multilayer polyurethane or polyurea coating compositions over a primer layer for protecting a leading edge substrate on an airfoil against liquid or solid particle erosion, the composition preferably made from an isocyanate-terminated prepolymer and curing agents, such as polyaspartic esters, aldimines and ketimines with a topcoat having flatting agent for matte coatings.

Abstract: This invention relates to the repair and removal of erosion or impact damage using hand sandable elastomeric coatings on a curved substrate, particularly such surfaces as the leading edge of the airfoil. Specialized applicators and methods of use are also disclosed.

Abstract: A method of protecting a substrate against damage comprising disposing on a substrate one or more coatings, wherein one coating comprises an isocyanate-terminated polyurethane prepolymer and a curing agent; wherein the curing agents comprise polyaspartic esters, ketimines, aldimines, or a combination comprising at least one of the foregoing curing agents; reacting the isocyanate-terminated polyurethane prepolymer with a curing agent; wherein the reacting can optionally be carried out in the presence of moisture or heat; and curing the isocyanate-terminated polyurethane prepolymer to form the coating.

Abstract: A sensor for the amperometric assay of cholesterol is provided which comprises a sensing electrode containing a first redox mediator and a reference electrode in simultaneous contact with a reagent strip containing a second redox mediator. The presence of the second redox mediator greatly amplifies the current flow produced by the presence of cholesterol and produces linear correlation of current flow with concentration over an extended range. The sensing electrode comprises a non-conductive support member having an electrically conductive layer containing the first redox mediator. The reference electrode is typically a Ag/AgCl electrode formed by coating an ink containing Ag/AgCl dispersed in a resin on a non-conductive base.

Abstract: An ion-selective electrode having an ion-selective membrane in direct contact with an electrical conductor is provided in which the membrane coats an uninsulated zone surrounded by insulation on the surface of a conductor which is coated with a layer of electrical insulation. The membrane overlays the insulation surrounding the insulation free zone and comprises a polymer which is generally of sufficiently similar composition to that comprising the electrical insulation layer so that it adheres to the insulation forming a membrane with increased structural strength. Embodiments of the electrode containing phosphatidylcholine in the ion-selective membrane have increased sensitivity.

Abstract: In an anticalculus oral composition containing in an orally acceptable vehicle one or a mixture of water soluble linear molecularly dehydrated alkali metal or ammonium polyphosphate salts as essential anticalculus agent, an amount of a fluoride ion source sufficient to supply about 25 ppm to about 2,000 ppm of fluoride ions, and one or a mixture of water soluble alkali metal or ammonium synthetic anionic polymeric polycarboxlate salts, the improvement comprising employing in said composition a polyphosphate ion:polycarboxylate salt weight ratio ranging from about 0.3:1 to about 2.5:1.

Abstract: An Anticalculus Oral Composition, typically a mouthwash or dentifrice gel, containing compound having C-O-P bonds, such as phytic acid or an alkali metal (including ammonium) salt thereof as anticalculus agent, homogeneously distributed in a dentally acceptable oral vehicle. Also, present to inhibit enzymatic hydrolysis of the phytic compound and to promote caries reduction is an alkali metal fluoride.