Coated abrasive product incorporating selective mineral substitution
AssigneeMinnesota Mining and Manufacturing Company
InventorDavid E. Broberg
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Abstract
Replacement of all or most of the coarse mineral in a coated abrasive product by a superior (and typically more expensive) mineral improves abrading performance significantly more than would be predicted. In some cases the performance is superior to that of products made with either mineral alone. Typically 5% to 30% of the total mineral weight is made up of the superior mineral.
Claims16
A coated abrasive product having a specified nominal grade of abrasive granules firmly adherently bonded to a sheet backing, the particle size of said granules ranging from fine to coarse, said granules consisting essentially of at least two types of mineral, one of said types being present as a minor portion and demonstrably superior to an equivalent grade of the other (inferior) type in the abrading operation for which said coated abrasive product is intended to be used, most of said superior mineral being concentrated in the coarse portion, whereby said coated abrasive product significantly outperforms a coated abrasive product that is identical except that either (a) it contains only inferior mineral or (b) the same minor amount of superior mineral is distributed throughout the fine to coarse particle size range in the same proportions as is the inferior mineral.
Dependencies are inferred from the claim text.