Abstract: The invention relates to synthetic, non-fused, aluminum oxide-based abrasive mineral having a microcrystalline structure of randomly oriented crystallites comprising a dominant continuous phase of .alpha.-alumina and a secondary phase, to a method of making the same employing chemical ceramic technology, and to abrasive articles made with the abrasive mineral.

Abstract: Improved granular abrasive material comprises silicon carbide particles at least partially coated with an integral, durable surface layer of a hard refractory material comprising metal nitride or carbide. Hard refractory materials which provide a useful coating include, for example, silicon nitride or carbide, titanium nitride or carbide, sialon, and others. The surface layer is preferably provided by chemical vapor deposition, most preferably utilizing a fluidized bed. The improved granular abrasive material is particularly useful in various abrasive products such as coated abrasive products, nonwoven abrasive products and abrasive grinding wheels.

Abstract: An abrasive article comprising a plurality of separated abrasive agglomerates distributed within a matrix of undulated filaments is provided. The invention also provides a method of making an abrasive article comprising forming, within a lofty open web comprising undulated filaments bonded at points of mutual contact, a plurality of separated abrasive agglomerates to provide an abrasive agglomerate-impregnated web. Articles may be prepared of the agglomerate-impregnated web per se or by laminating layers of the web together preferably under pressure. Exemplary articles include abrasive wheels, discs, belts, sheets, blocks and the like.

Abstract: An abrading block (10) especially suited for wet hand surface finishing operations is provided. The abrading block (10) comprises a body (11) having a bottom surface (12) having an opening (13) therein. Bottom surface (12) is adapted to hold a sheet of abrasive material (14), also having an opening (15) therethrough, in a substantially planar position with an abrasive working face (16) exposed and with the opening (15) through the sheet of abrasive material (14) aligned with the opening (13) in the bottom surface (12). The body (11) also includes an opposite surface (17) capable of being grasped by the hand of the user, a cavity (18) capable of containing liquid, and a conduit (19) extending from the opening (13) in the bottom surface (12) to the cavity (18) for passage of liquid from the cavity (18) to the opening (13). An air vent (20) may be provided through the body (11 ) into the cavity (18) to permit liquid to flow therefrom under gravity.

Abstract: Surfactants which are blocked against surfactant action (identified herein as "photolabile blocked surfactants") by a photolabile protective or masking group but which, on exposure to actinic radiation, become unblocked are provided. Coating compositions in which surfactant is formed on irradiation are provided by blending the photolabile blocked surfactant with polymeric film-forming materials.Compositions containing the photolabile blocked surfactants are useful when employed as protective coatings on various substrates or as the adhesive in a pressure sensitive adhesive tape. Although initially well adhering to a substrate, such compositions may be readily removed from the substrate following exposure of the same to suitable radiation which unblocks the surfactant to permit it to regain its surfactant activity.

Abstract: A sealing composition prepared by reacting water-soluble polyurethane prepolymer with water containing latex to provide a gelled viscous mass which will cure to a cross-linked latex-reinforced gel capable of preventing or inhibiting leakage in various structures, when applied at the site of the leakage in the viscous state. The sealing composition of the invention also preferably contains up to 60% by weight of fillers of the total weight of the composition to provide a high compressive strength, shrink-resistant sealing composition.

Abstract: A photosensitive element is provided by an actinic radiation-transmissive film-forming polymeric material which contains photolabile blocked surfactant capable upon exposure to actinic radiation of releasing a detectable quantity of surfactant in actinic radiation exposed areas in areas not exposed to actinic radiation and unblocked surfactant in an image-wise pattern in the actinic radiation exposed areas. An imaging process is also provided comprising providing the actinic radiation-sensitive element and exposing the actinic radiation-sensitive element to actinic radiation in an image-wise pattern at an intensity and for a time sufficient to release an image-wise pattern of released surfactant in the exposed area.

Abstract: A one part composition useful as a putty for filling recessed areas in flexible parts of damaged auto bodies and the like is provided. The curable composition has a viscosity in the range of 50,000 to 450,000 cps and comprises by volume 6 to 25 parts binder comprising substantially non-reactive solvent-soluble polyurethane, 43 to 68 parts solvent for the binder and 20 to 42 parts talc filler. Other fillers may also be included. The preferred polyurethane binder is a linear polyurethane elastomer which is substantially free of cross-links and has an elongation at break value in the range of 300-850% and a tensile strength in the range of 1,500 to 7,000 psi.

Abstract: A dry mop especially adapted for collecting and pushing dust and fine dirt on or from smooth surfaces includes a plurality of dusting elements, a mop frame and fastening means for holding the dusting elements in a side-by-side relationship to the mop frame. Each dusting element comprises a substantially continuous elongate array of repeating segments of at least three ribbon loops of a dusting fabric.

Abstract: A surface treating pad having a renewable working surface comprises a base layer upon which is removably fastened at least one unitary stack comprising a plurality of thin layers of lofty nonwoven abrasive material. The layers on the stack are removably fastened together and to the base layer so that individual layers may be easily separated from the stack or from the base layer to expose a fresh surface treating working face without damage to the remainder of the pad. The pads are particularly suited for treating floors.

Abstract: There is provided a tamper evident container seal comprising a normally transparent polymer film which can be rendered translucent by stretching and transparent by relaxing. There is also provided a polymer film useful as a seal of the same type of film which bears an image which is not readily visible when the film is relaxed, but becomes readily visible when the film is stretched.

Abstract: This invention provides a method for detecting loss by leakage of liquid from a liquid-containing vessel by employing a submersible diaphragm-type pressure transducer having an integral operational amplifier in an appropriate electrical connection with a suitable power supply and digital volt meter. The method comprises steps of placing the transducer into the vessel beneath the surface of the liquid, energizing the operational amplifier to obtain an initial electrical output, recording the initial electrical output with a digital volt meter, adjusting the liquid volume of the vessel by a predetermined amount, (i.e.

Abstract: A filamentary structure comprises a spiral thermoplastic core filament disposed within a thermoplastic sheath component, consisting either of a tube or of at least three thermoplastic filaments, the sheath component being joined to the successive turns of the spiral core filament. The spiral core filament and the sheath component may comprise the same or different thermoplastic polymers, suitable polymers being polyamides, polyesters and polyolefins.The core filament and the sheath component may be extruded together from a spinning jet, and a plurality of the filamentary structures may be extruded side-by-side so that their sheath components are joined together to form a fabric structure.

Abstract: The cure time of polyurethane prepolymer curable with water to form polyurethane hydrogel is prolonged by the addition to the water of certain micelle-forming adducts which substantially extend the cure time.

Abstract: Contaminant components in waste water are complexed with a chelating agent and the complexed component is gelled with a polyurethane prepolymer to provide a gelled mass.

Abstract: A photosensitive element is provided by an actinic radiation-transmissive film-forming polymeric material which contains photolabile blocked surfactant capable upon exposure to actinic radiation of releasing a detectable quantity of surfactant in actinic radiation exposed areas in areas not exposed to actinic radiation and unblocked surfactant in an image-wise pattern in the actinic radiation exposed areas. An imaging process is also provided comprising providing the actinic radiation-sensitive element and exposing the actinic radiation-sensitive element to actinic radiation in an image-wise pattern at an intensity and for a time sufficient to release an image-wise pattern of released surfactant in the exposed area.

Abstract: An abrasive article comprising a plurality of separated abrasive agglomerates distributed within a matrix of undulated filaments is provided. The invention also provides a method of making an abrasive article comprising forming, within a lofty open web comprising undulated filaments bonded at points of mutual contact, a plurality of separated abrasive agglomerates to provide an abrasive agglomerate-impregnated web. Articles may be prepared of the agglomerate-impregnated web per se or by laminating layers of the web together preferably under pressure. Exemplary articles include abrasive wheels, discs, belts, sheets, blocks and the like.

Abstract: A method of forming a resilient open fibrous web of inter-engaged coarse continuous kinky filaments, with one major surface of the web being flattened. The method involves extruding a bundle of filaments of a thermoplastic material, aligning the bundle so the filaments fall into a quench bath and upon a contact surface so as to provide differential quenching, and advancing the resulting web at a slower rate than the rate of extrusion.

Abstract: An anti-slip mat is provided having a bottom surface adapted to permit the mat to lie flat on a flat surface and an opposite regularly undulated top surface characterized by having raised portions and depressed portions and being coated with an abrasive, anti-slip layer. A preferred method of forming such a mat includes steps of forming a layer of primer resin on a release liner, coating one surface of the primer resin layer with liquid curable polyurethane adhesive resin, distributing abrasive grain over the polyurethane resin layer while it is still liquid, at least partially curing the polyurethane resin, coating the resultant grain-coated surface with liquid curable polyurethane resin, curing the resultant coating, removing the release liner, forming an embossable sheet of a polymeric composition, contacting one surface of the polymeric sheet with the surface of the primer resin layer opposite the abrasive surface to provide a laminated structure and embossing the laminated structure to provide the mat.

Abstract: Delamination-resistant abrasive belts and discs suitable for offhand and automated article finishing comprise a lofty, non-woven, three-dimensional abrasive web adhesively bonded to a stretch-resistant woven fabric with a polyurethane binder comprising the reaction product of poly-1,4 oxybutylene) glycol diisocyanate having a molecular weight of about 500-4000 and a reactive compound capable of reacting with the isocyanate radicals. The reactive compound is selected from a group consisting of water, diol, triol, diamine or mixtures thereof.