A splice having (a) a support comprising a polymeric film having a major surface; and (b) a fiber reinforcement 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 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 to form spliced flexible abrasive articles, including endless belt forms.
An abrasive article comprising an abrasive fabric comprising a fabric having discrete areas of electro-deposited metal extending on or therethrough and having abrasive material embedded in the metal, a layer of adhesive, and a backing substrate, the abrasive fabric being bonded to the backing substrate by the layer of adhesive, characterized in that either (i) the surface of the abrasive fabric bonded to the backing has been roughened and/or (ii) the layer of adhesive comprises an epoxy-acrylate thermosetting adhesive.
An environmentally-safe heat-reactive curable melt adhesive in fine crystalline powder form is mixed with any of a large variety of compatible particulate materials and heated to a predetermined temperature for a predetermined time during which the powder liquifies and cross links. The preliminary mixture can be accomplished by gentle tumbling, and in the process, the powder crystals cling to the particles. Upon subsequent cooling, the powder adhesive cross link bonds the particles to each other and/or to each other and to a supporting member or surface. Application of pressure at the time of heating is particularly useful where the end product has some thickness. A grinding wheel can be made by sifting the dry mixture through a soft non-woven pad until its interstices are essentially filled. The pad is then placed under pressure during the heating process.
In a power grinder (1) with a motor (6) and a gear (7) that drive an oscillating drive means (2), which moves a grinding belt (3) secured to it to reciprocate, a simple change of the grinding belt (3) is made possible by providing that the grinding belt (3) has a hook-and-loop closure (4), or the grinding belt (3) is disposed with its first end (11) on the drive means (2), and its second end (12) is connected to a handle (13).
An adhesive for use in coated abrasive belt joints includes a blocked isocyanate, urethane system. The blocking agent can include phenols, oximes, alcohols, caprolactam, and diethyl malonate. The adhesive can be crosslinked with amine or alcohol. A coated abrasive belt is formed by attaching a plurality of abrasive particles to a first surface of a backing layer. A size coat is deposited over the abrasive particles to form a coated abrasive. The coated abrasive is cut to form a strip having a first end and a second end. The ends of the strip are joined with an adhesive including a blocked isocyanate, urethane system.
