Patent ID: 7887607

Claim:
A method for preparing a coated abrasive having three-dimensional abrasive structures, comprising: (a) forming a plurality of abrasive structures having a three-dimensional shape on a backing by using a first abrasive slurry and drying the abrasive structures, and (b) spray-coating a second abrasive slurry over the three-dimensional abrasive structures to form a coating layer thereon and drying the coating layer, wherein the second abrasive slurry is sprayed over the abrasive structures at an angle (A) calculated by formula I: A =atan { H /( D−R/ 2)} (I) in which A is the angle between the line of spray and the horizontal line, H and R are the height (μm) and the diameter (μm) of the three-dimensional abrasive structure, respectively, and D is the distance (μm) between two adjacent three-dimensional abrasive structures.