Porous coated abrasive article and method of making the same

A method of making a porous coated abrasive article, the method comprising:

• providing a porous backing having opposed first and second major surfaces, wherein the porous backing comprises a porous oriented thermoplastic film, wherein the porous backing has a land portion and openings extending between the first and second major surfaces, wherein each opening has a respective area at the first major surface, wherein the openings have a number density of 5 to 4600 openings per square inch, and wherein the total area of the openings is from 1 to 90 area percent, based on the combined total areas of the land portion and the openings, wherein the openings are surrounded by respective ridges of the porous backing;
• disposing a precursor abrasive layer on the first major surface of the porous backing, wherein the precursor abrasive layer comprises abrasive particles dispersed in a curable binder precursor;
• and
• at least partially curing the curable binder precursor to provide a binder thereby providing a porous abrasive layer having an abrading surface, wherein the second major surface of the porous backing and the abrading surface are in fluid communication through at least some of the openings.