Sandpaper with non-slip layer

Abstract

The present invention provides an abrasive article, e.g. a sheet of sandpaper, comprising a backing layer having opposed first and second major surfaces, an adhesive make coat on the second major surface, abrasive particles at least partially embedded in the make coat, thereby defining an abrasive surface, and an exposed non-slip coating layer on the first major surface, the non-slip coating layer comprising at least a base resin and a tackifying resin.

1 . A sheet of sandpaper, comprising:
 (a) a flexible backing layer having opposed first and second major surfaces;   (b) an adhesive make coat on the second major surface;   (c) abrasive particles at least partially embedded in the make coat, thereby defining an abrasive surface; and   (d) an exposed non-slip coating layer on the first major surface, wherein the nonslip coating layer comprises an amorphous base resin and an effective amount of a tackifying resin.   
     
     
         2 . A sheet of sandpaper as defined in  claim 1 , wherein the non-slip coating layer is a hot-melt coating layer. 
     
     
         3 . A sheet of sandpaper as defined in  claim 1 , wherein the flexible backing layer consists of a single layer, wherein the adhesive make coat consists of a single layer in direct contact with the second major surface of the adhesive make coat, and wherein the non-slip coating layer consists of a single layer. 
     
     
         4 . A sheet of sandpaper as defined in  claim 1 , wherein the non-slip coating layer has an average tack level, as measured by an Inverted Probe Test using a 10 second dwell time and a probe removal speed of 1 cm/s, of no greater than about 250 grams. 
     
     
         5 . A sheet of sandpaper as defined in  claim 1 , wherein the non-slip coating layer has an average tack level, as measured by an Inverted Probe Test using a 10 second dwell time and a probe removal speed of 1 cm/s, of no greater than about 60 grams. 
     
     
         6 . A sheet of sandpaper as defined in  claim 1 , wherein the non-slip coating layer has an average kinetic coefficient of friction of at least about 0.75 grams when measured according to ASTM D 1894-08. 
     
     
         7 . A sheet of sandpaper as defined in  claim 1 , wherein the non-slip coating layer, when bonded to itself, has an adhesion that is less than the two-bond adhesion of the non-slip coating layer to the backing layer, whereby the non-slip coating layer does not separate from the backing layer when the non-slip coating layer is separated from itself. 
     
     
         8 . A sheet of sandpaper as defined in  claim 1 , wherein the non-slip coating layer, when bonded to itself, has an adhesion level that is less than the cohesive strength of the non-slip coating layer, whereby the non-slip coating layer is not damaged when the non-slip coating layer is separated from itself. 
     
     
         9 . A sheet of sandpaper as defined in  claim 1 , wherein the non-slip coating layer has a thickness of at least about 20 microns and no greater than about 50 microns. 
     
     
         10 . A sheet of sandpaper as defined in  claim 1 , wherein the non-slip coating layer has a coating weight of at least about 15 g/m 2  and no greater than about 100 g/m 2 . 
     
     
         11 . A sheet of sandpaper as defined in  claim 1 , wherein the non-slip coating layer comprises a generally planar outer surface opposite the abrasive particles. 
     
     
         12 . A sheet of sandpaper as defined in  claim 1 , wherein the flexible backing layer is paper having a weight ranging from an A weight to an F weight. 
     
     
         13 . A sheet of sandpaper as defined in  claim 1 , wherein the non-slip coating layer exhibits a glass transition temperature in the range of about −40° C. to about −5° C. 
     
     
         14 . A sheet of sandpaper as defined in  claim 1 , wherein the base resin consists essentially of an amorphous polymer. 
     
     
         15 . A sheet of sandpaper as defined in  claim 1 , wherein the base resin comprises an amorphous hydrocarbon polymer with a glass transition temperature in the range of approximately −17 C. 
     
     
         16 . A method of hand sanding a work surface comprising the steps of:
 (a) providing a sheet of sandpaper as defined in  claim 1 ;   (b) manually engaging the non-slip coating layer with at least one of a hand and a manually operated tool; and   (c) manually moving the sandpaper in a plurality of directions over the work surface.   
     
     
         17 . A sheet of sandpaper for hand sanding a work surface, comprising:
 (a) a paper backing layer having opposed first and second major surfaces;   (b) an adhesive make coat on the backing layer second major surface;   (c) abrasive particles at least partially embedded in the adhesive make coat, thereby defining an abrasive surface; and   (d) an exposed non-slip coating layer on the backing layer first major surface, wherein the non-slip coating layer is a hot-melt coating layer comprising an amorphous base resin and a tackifying resin, the non-slip coating layer comprising a thickness of no greater than about 50 microns and wherein the entirety of the outer surface of the non-slip coating layer is a generally planar surface.   
     
     
         18 . A method of making a sheet of sandpaper having a non-slip coating layer, comprising the steps of:
 (a) providing a paper backing layer having opposed first and second major surfaces;   (b) coating an adhesive make coat on the second major surface;   (c) at least partially embedding abrasive particles in the make coat, thereby forming an abrasive surface; and   (d) hot-melt coating a non-slip coating layer comprising at least one amorphous base resin and at least one tackifying resin on the first major surface.