Granular abrasive

Abstract

Abstract This invention relates to an abrasive granule, and, in particular, one which comprises an agglomerate having individual abrasive grains coated on the periphery thereof. Conventional coated abrasives typically consist of a single layer of abrasive grain adhered to a backing. It has been found that only up to about 15% of the grains in the layer are actually utilized in removing any of the workpiece. It follows then that about 85% of the grains in the layer are wasted. To overcome this problem of waste, many attempts have been made to distribute the abrasive grains on the backing in such a manner so that a higher percentage of abrasive grains can be utilized, thus leading to extended life of the abrasive product. This invention provides an erodable abrasive granule comprising a plurality of first abrasive grains bonded together by a first binder to form an erodable base agglomerate and at least a partial coating of second abrasive grains bonded to the periphery of the base agglomerate by means of a second binder. These abrasive granules can be incorporated into a wide variety of abrasive articles such as grinding wheels, coated abrasives, and non-woven abrasives. The addition of these second abrasive grains dramatically increases the grinding performance over the base agglomerate by itself.

Inventors

• 👤 Ulrich C/O Minnesota Mining And Bloecher

Bibliographic Details