Coated abrasive material and manner of manufacture

Claim 1

OPEN MESH COATED ABRASIVE MATERIAL COMPRISING IN COMBINATION AN OPEN MESH WOVEN FABRIC BACKING MEMBER OF INTERLACED WRAP AND FILL YARNS, AN ADHESIVE BINDER COMPOSITION COMPRISING A RESINOUS CONDENSATION PRODUCT OF A COMPOSITION COMPRISING PHENOL AND FORMALDEHYDE COATING SAID YARNS, AND HAVING A CONTROLLED DEGREE OF FRIABILITY IN AT LEAST THE OUTERMOST SURFACE THEREOF SUCH THAT THE ADHESIVE BOND WILL BREAK WHEN THE ABRASIVE MATERIAL IS RUBBED AGAINST A SURFACE BEING GROUND INTO SMALL PARTICLES NOT MORE THAN A FEW TIMES LARGER IN AVERAGE DIAMETER THAN THE INDIVIDUAL ABRASIVE GRAINS, ABRASIVE GRAINS ADHERED TO THE YARNS BY MEANS OF THE ADHESIVE BINDER SAID ABRASIVE GRAINS BEING SMALLER IN SIZE THAN THE MESH OPENINGS OF THE OPEN MESH FABRIC, AND A WATER INSOLUBLE AND WATER RESISTANT COATING INTERMEDIATE SAID ADHESIVE BINDER AND THE YARNS OF SAID OPEN MESH FABRIC BACKING MEMBER, SAID COATING COMPRISING AN INTERPOLYMER COMPRISING FROM ABOUT 5 TO 70% BY WEIGHT ETHYLENE, FROM ABOUT 30 TO 95% BY WEIGHT VINYL CHLORIDE, AND FROM ABOUT 1 TO 5% BY WEIGHT OF A POLAR MONOMER OF WHICH AT LEAST ABOUT 50% BY WEIGHT IS ACRYLAMIDE SAID COATING IMPREGNATING THE YARNS AND ENCAPSULATING THEM WHEREBY A COATED ABRASIVE MATERIAL IS PROVIDED THAT SUBSTANTIALLY RETAINS ITS INITIAL TEAR STRENGTH AND FLEXIBILITY CHARACTERISTICS WHETHER USED IN WET OR DRY GRINDING APPLICATIONS.