Abstract: An abrasive article having a sheet-like substrate having at least one major surface; an abrasive coating adhered to the at least one major surface of the substrate, wherein the abrasive coating comprises a plurality of abrasive particles and an organic binder medium; and, a hard carbon coating layer comprising a diamond-like carbon film. The hard carbon coating layer in the coated abrasive article can be provided as a top coat or, alternatively, as located between the abrasive coating and a covering layer based on an organic binder layer. The invention also pertains to a method of making such an abrasive article.

Abstract: Ceramic abrasive grits are formed by an impregnation process that involves preparing an alumina hydrate sol, drying the sol to form a porous solid, crashing the solid to produce particles, calcining the dried particles, preparing a mixture of an additive metal oxide or its precursor in a liquid vehicle, impregnating the mixture into the calcined particles, drying the impregnated particles, calcining the dried impregnated particles, and firing the particles to produce ceramic abrasive grits. The concentration of the modifying additive metal is greater at or near the surface of the grit than at the interior of the grit.

Abstract: An abrasive article is provided which comprises a substrate having a surface bearing and abrasive layer and an opposite surface having a layer of pressure sensitive adhesive and a protective liner covering the layer of pressure sensitive adhesive. The liner includes a lift flap secured thereto which does not extend beyond the perimeter of the liner and has a free portion accessible to finger grip.

Abstract: A splice means having a support means comprising a polymeric film having a major surface; and (b) a fiber reinforcement means comprising a plurality of monofilaments where the monofilaments have longitudinal axes extending in a parallel direction, one to another, across the major surface, and the monofilaments are bonded to the major surface of the support means by a fiber adhesive, where the fiber adhesive is a moisture-cured polyurethane adhesive. The invention also relates to methods and products thereof for using the splice means to form spliced flexible abrasive articles, including endless belt forms.

Abstract: A method of making a coated abrasive article, and the product thereof, involving the steps of: providing a backing sheet having two free sheet ends and joining the two free sheet ends together as a splice to form an endless backing sheet; temporarily supporting the backing sheet before or after performing the splicing; applying fibrous reinforcing material onto a major surface of the endless backing sheet such as by winding at least one continuous fibrous strand or narrow fibrous strip in a plurality of revolutions around the endless backing sheet with applying of a first binder precursor to the fibrous reinforcing material such that the first binder precursor bonds the fibrous reinforcing material to the second major surface of the endless backing to form a reinforcing fiber layer; exposing the first binder precursor to conditions effective to solidify the first binder precursor; and forming an abrasive coating on the surface of one of the fiber reinforcing layer, or alternatively, the exposed surface of the

Abstract: A method of making a coated abrasive article and the product thereof, involving the steps of: providing an endless spliceless backing loop substrate; applying fibrous reinforcing material onto a major surface of the endless backing substrate by applying of a first binder precursor to the fibrous reinforcing material such that the first binder precursor bonds the fibrous reinforcing material to the endless backing substrate to form a reinforcing fiber layer; further solidifying the first binder precursor; and forming an abrasive coating on the surface of one of the fiber reinforcing layer, or alternatively, the exposed surface of the backing substrate.

Abstract: Ceramic abrasive grits are formed by an impregnation process that involves preparing an alumina hydrate sol, drying the sol to form a porous solid, crushing the solid to produce particles, calcining the dried particles, preparing a mixture of an additive metal oxide or its precursor in a liquid vehicle, impregnating the mixture into the calcined particles, drying the impregnated particles, calcining the dried impregnated particles, and firing the particles to produce ceramic abrasive grits. The concentration of the modifying additive metal is greater at or near the surface of the grit than at the interior of the grit.

Abstract: An abrasive article having a sheet-like substrate having at least one major surface; an abrasive coating adhered to the at least one major surface of the substrate, wherein the abrasive coating comprises a plurality of abrasive particles and an organic binder medium; and, a hard carbon coating layer comprising a diamond-like carbon film. The hard carbon coating layer in the coated abrasive article can be provided as a top coat or, alternatively, as located between the abrasive coating and a covering layer based on an organic binder layer. The invention also pertains to a method of making such an abrasive article.

Abstract: A coated abrasive article comprising:(a) a backing;(b) at least one layer comprising a plurality of precisely shaped abrasive particles that comprise abrasive grits and a free-radically polymerized binder, wherein said precisely shaped particles have vertexes and(c) a bonding medium which serves to adhere said precisely shaped particles to said backing;wherein the precisely shaped particles are randomly disposed on the backing such that at least a portion of said particles are oriented with said vertexes pointing toward said backing.

Abstract: The invention provides an abrasive article having a surface having a machine direction axis and opposite side edges, each side edge being parallel to the machine direction axis and a plurality of parallel rows of abrasive composites in fixed position on the surface, each row being aligned at an angle with a side edge which is neither 0.degree. nor 90.degree., and methods for making such an abrasive article. The abrasive article of this invention also can be used in any convenient form including an endless belt. The resulting abrasive article provides a high rate of cut, long belt life, and a relatively fine surface finish on the workpiece being abraded.

Abstract: A sealer or adhesive composition based on a polyoxyalkylene polymer having a silicon-containing hydrolyzable group, which has improved adhesion in a dried, cured state with a paint coating containing acrylic resins, acrylic-urethane resins, or urethane resins. The improvement involves the addition to such a sealer/adhesive composition of an alkylarylsulfonamide contained therein in an amount of least about 50 phr or more, by weight. The invention also pertains to a method applying and adhering a paint coating to such a sealer composition after it is dried.

Abstract: A composition suitable for use in priming a first plastic surface for adhesion of a second plastic material thereto is presented, the composition comprising an epoxy resin and a solvent, the composition derived from the combination of:a. a first composition comprising a first organic material having a plurality of epoxy-functional groups, the first organic material dispersed in a first organic solvent; andb. a second composition comprising a second organic material having at least one functional group reactive with epoxy-functional groups of the first organic material, the second organic material dispersed in a second organic solvent,wherein the first and second organic solvents comprise the solvent and the epoxy resin comprises the reaction product of the first and second organic materials, the solvent adapted to wet and penetrate but not be substantially retained by the first plastic surface where applied thereto.

Abstract: A sealer or adhesive composition based on a polyoxyalkylene polymer having a silicon-containing hydrolyzable group, which has improved compatibility with a base or first paint coat containing acrylic resins. The improvement involves the addition to such a sealer/adhesive composition of a polar organic solvent material having both a Snyder's polarity value in the range of from 6.2 to 7.3 and belonging to Snyder's selectivity group III. In a method of the present invention, the inventive sealer/adhesive composition is wet-on-wet overcoated by a base coat of a multi-coat paint system, where the base coat contains acrylic resin, pigment and auxiliary polar solvents, while retarding and even completely preventing adverse surface defects in the base coat upon its drying (curing), such as cracking or wrinkling therein, to provide an improved coated substrate.

Abstract: A sol-gel process of producing durable alpha alumina-based ceramic particularly useful as abrasive grain from alpha alumina monohydrate is improved by the addition of a nucleating agent. Improved abrasive products containing the durable ceramic abrasive grains are also provided.

Abstract: A grinding wheel which includes abrasive grits characterized in that at least part of the abrasive grits are comprised of at least about 0.5% by weight of at least one modifying metal oxide and wherein the concentration of said modifying metal oxide is greater at or near the surface than at the interior of said grit.

Abstract: Ceramic abrasive grits are formed by an impregnation process that involves preparing an alumina hydrate sol, drying the sol to form a porous solid, crushing the solid to produce particles, calcining the dried particles, preparing a mixture of an additive metal oxide or its precursor in a liquid vehicle, impregnating the mixture into the calcined particles, drying the impregnated particles, calcining the dried impregnated particles, and firing the particles to produce ceramic abrasive grits. The concentration of the modifying additive metal is greater at or near the surface of the grit than at the interior of the grit.

Abstract: An improved abrasive grain comprising the sintered product of a porous non-sintered particle having a coating of inorganic material thereon is provided. A preferred method of making such abrasive grains comprises coating the porous base particles with inorganic particles. The preferred step of coating comprises a step of mixing the base particles with a suspension containing the inorganic particles in a carrier fluid. The porous base particles having the coating of inorganic particles thereon are sintered, to generate the ceramic abrasive grain product. The abrasive grains may be incorporated, to advantage, in a variety of abrasive products including for example bonded abrasives, nonwoven abrasive products and coated abrasive products.

Abstract: The present invention relates to elastomeric copolymers and block copolymers, e.g., based upon styrene/isoprene, having a novel condensed phase structure wherein polymer branches occur along the polymer backbone, either at a predetermined location or at random locations. The polymers are made by a method which comprises the step of reacting, under polymerization conditions, hydrocarbyl lithium initiator, at least one anionically polymerizable compound, and an organometallic- substituted styrene condensing agent. The reactants may be added simultaneously to produce a copolymer with polymer branch segments randomly located along the polymer backbone or sequentially to produce a copolymer with branches located at the same predetermined location along the polymer backbone. The resultant polymers may be further reacted with a linking agent to form multi-arm copolymers.

Abstract: A surface treating tape has a sheet-like backing covered with closely spaced protuberances which are coated with an abrasive layer which contains premium abrasive particles. The surface finishing tape is useful for finishing magnetic disks and other substrates to provide a percision finish.