Sandpaper with non-slip coating layer

Abstract

The present disclosure generally relates to abrasive articles for abrading a work surface such as, for example, flexible sheet-like abrasive articles, as well as methods of making and using such abrasive articles. Some embodiments of the abrasive articles include an improved, more heat resistant non-slip coating or layer.

1 . Sandpaper, comprising:
 a backing layer having opposed first and second major surfaces;   an adhesive make coat directly on the first major surface;   abrasive particles at least partially embedded in the make coat, thereby defining an abrasive surface; and   a non-slip layer on the second major surface, the non-slip layer comprising:
 a dimer acid polyamide; 
 an elastomer; and 
 a tackifying agent. 
   
     
     
         2 . The sandpaper of  claim 1 , wherein the elastomer is selected from the group consisting of natural rubber, synthetic rubber, ethylene-vinyl acetate (EVA), polyvinyl acetate (PVA), thermoplastic vulcanizates, acrylates, acrylic polymers, thermoplastic olefins and combinations thereof. 
     
     
         3 . The sandpaper of  claim 2 , wherein the elastomer is synthetic rubber, and wherein the synthetic rubber is selected from the group consisting of styrene-butadiene rubber (SBR), polystyrene-polyisoprene-polystyrene (SIS) rubber, polyisoprene, ethylene-propylene terpolymers (EPDM rubber), silicone rubber, and polyurethane rubber. 
     
     
         4 . The sandpaper of  claim 1 , wherein the non-slip layer includes between about 10% and about 60% by weight of a styrene-isoprene-styrene block copolymer. 
     
     
         5 . The sandpaper of  claim 1 , wherein the non-slip layer includes between about 15% and about 75% by weight of a dimer acid polyamide. 
     
     
         6 . The sandpaper of  claim 1 , wherein the ratio of dimer acid polyamide to styrene-isoprene-styrene block copolymer is between about 70:16 to about 31:55. 
     
     
         7 . The sandpaper of  claim 1 , wherein the non-slip layer includes between about 10% and about 25% by weight of tackifying agent. 
     
     
         8 . The sandpaper of  claim 1 , wherein the tackifying agent is a C5 or C9 tackifier resin. 
     
     
         9 . The sandpaper of  claim 1 , wherein the non-slip coating layer is non-tacky. 
     
     
         10 . The sandpaper of  claim 1 , wherein the non-slip coating layer has an average tack level, as measured by ASTM D2979-01 using a 10 second dwell time, and a probe removal speed of 1 cm/s of no greater than about 300 grams. 
     
     
         11 . The sandpaper of  claim 1 , wherein the non-slip coating layer is configured to selectively fold over onto itself, bond to itself, and release from itself such that, when bonded to itself, the non-slip coating layer has an adhesion that is less than a 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. 
     
     
         12 . The sandpaper of  claim 1 , wherein the non-slip coating layer has a thickness of between at least about 0.2 mils and no greater than about 50 mils. 
     
     
         13 . The sandpaper of  claim 1 , wherein the non-slip coating layer has a coating weight of at least about 4 g/m 2  and no greater than about 20 g/m 2 . 
     
     
         14 . The sandpaper of  claim 1 , wherein the non-slip coating layer comprises a continuous uniform outer surface opposite the abrasive particles. 
     
     
         15 . The sandpaper of  claim 1 , wherein the non-slip coating layer has an average peak static coefficient of friction of at least about 1 gram when measured according to ASTM D 1894-08. 
     
     
         16 . The sandpaper of  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. 
     
     
         17 . The sandpaper of  claim 1 , wherein the relative hot-melt adhesion of the non-slip coating layer generates an axial force of −18 Newtons, preferably in the range −15 Newtons to −5 Newtons, at 80° C. 
     
     
         18 . The sandpaper of  claim 1 , wherein the non-slip layer having a rough or randomly textured surface and configured to selectively fold over onto itself, bond to itself, and release from itself such that, when bonded to itself, the non-slip coating layer has an adhesion level that is less than a 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.