Abrasive articles and methods of forming same

Abstract

An abrasive article includes a backing; a make coat overlying the backing; and a plurality of abrasive particles overlying the backing and at least partially contained in the make coat; and a make coat thickness ratio (Tg/Ta) of not greater than 1.5, wherein Tg is the average thickness of the make coat at the sides of the abrasive particles and the Ta is the average thickness of the make coat.

What is claimed is: 
     
         1 . An abrasive article comprising:
 a backing;   a make coat overlying the backing;   a plurality of abrasive particles overlying the backing and at least partially contained in the make coat;   a make coat thickness ratio (Tg/Ta) of not greater than 1.5, wherein Tg is the average thickness of the make coat at the sides of the abrasive particles and the Ta is the average thickness of the make coat; and   and wherein at least 60% of the total number of the abrasive particles are well oriented having a tilt angle of 5 to 90 degrees.   
     
     
         2 . The abrasive article of  claim 1 , wherein the plurality of abrasive particles comprise shaped abrasive particles and/or elongated abrasive particles. 
     
     
         3 . The abrasive article of  claim 2 , wherein each of the shaped abrasive particles or elongated abrasive particles of the plurality of shaped abrasive particles or elongated abrasive particles comprises a body including a first major surface, a second a major surface opposite the first major surface, and a side surface extending between the first major surface and the second major surface, wherein the body comprises at least 3 exterior corners and wherein the side surface comprises at least 4 side surface sections. 
     
     
         4 . The abrasive article of  claim 1 , wherein the plurality of abrasive particles comprises a plurality of shaped abrasive particles, each of the shaped abrasive particles of the plurality of shaped abrasive particles including at least 3 interior corners, and wherein not greater than 50% of the total number of shaped abrasive particles have a crack at an interior corner on the first major surface. 
     
     
         5 . The abrasive article of  claim 4 , wherein the shaped abrasive particles have a three-pointed star two-dimensional shape as viewed in a plane of a length and width of the body. 
     
     
         6 . The abrasive article of  claim 1 , wherein the thickness ratio (Tg/Ta) is not greater than 1.5 and at least 0.70. 
     
     
         7 . The abrasive article of  claim 6 , wherein the thickness ratio (Tg/Ta) is not greater than 1.5 and at least 0.80. 
     
     
         8 . The abrasive article of  claim 7 , wherein the thickness ratio (Tg/Ta) is not greater than 1.5 and at least 0.90. 
     
     
         9 . The abrasive article of  claim 6 , wherein the make coat comprises a thickness standard deviation at the sides of the abrasive particles (STDTg) of not greater than 70 microns. 
     
     
         10 . The abrasive article of  claim 9 , wherein the make coat thickness standard deviation at the sides of the abrasive particles (STDTg) is at least 10 microns and not greater than 70 microns. 
     
     
         11 . The abrasive article of  claim 10 , wherein the make coat thickness standard deviation at the sides of the abrasive particles (STDTg) is at least 10 microns and not greater than 65 microns. 
     
     
         12 . The abrasive article of  claim 9 , wherein at least 70% of the plurality of abrasive particles comprising a plurality of shaped abrasive particles are well oriented. 
     
     
         13 . The abrasive article of  claim 12 , wherein at least 80% of the plurality of abrasive particles comprising a plurality of shaped abrasive particles are well oriented. 
     
     
         14 . The abrasive article of  claim 9 , further comprising a coating density of well oriented particles of at least 42 grains/cm 2 . 
     
     
         15 . The abrasive article of  claim 14 , further comprising a coating density of well oriented particles of at least 46 grains/cm 2 . 
     
     
         16 . The abrasive article of  claim 6 , further comprising a standing portion of shaped abrasive particles (Pst) having a standing orientation and a slanted portion (Psl) of shaped abrasive particles having a slanted orientation, and further comprising a ratio of the standing portion relative to the slanted portion (Pst/Psl) of at least 1 and not greater than 100. 
     
     
         17 . The abrasive article of  claim 6 , further comprising a standing portion of shaped abrasive particles (Pst) having a standing orientation and a fallen portion (Pf) of shaped abrasive particles having a fallen orientation, and further comprising a ratio of the standing portion relative to the fallen portion (Pst/Pf) of at least 2.0 and not greater than 1000. 
     
     
         18 . The abrasive article of  claim 17 , wherein the ratio of the standing portion relative to the fallen portion (Pst/Pf) of at least 2.4 and not greater than 1000. 
     
     
         19 . The abrasive article of  claim 18 , wherein the ratio of the standing portion relative to the fallen portion (Pst/Pf) of at least 3.0 and not greater than 500. 
     
     
         20 . The abrasive article of  claim 17 , further comprising a percentage of fallen shaped abrasive particles having a tilt angle of 0 to 5 degrees of not greater than 20% of the plurality of abrasive particles comprising a plurality of shaped abrasive particles.