Reduced viscosity slurries, abrasive articles made therefrom and methods of making said articles

Abstract

Sluuries and binder precursor dispersions suitable for use in producing abrasive articles are presented. Slurries comprise a polymerizable resin which is preferably addition polymerizable, abrasive particles, and modifying particles, wherein the modifying particles are present in an amount sufficient to reduce the viscosity of the slurry. Abrasive articles incorporating cured versions of the slurries and dispersions are presented, as well as methods of making the articles and of reducing sedimentation rate of mineral particles (abrasive or filler).

What is claimed is: 
     
       1. A coated abrasive of the type having a flexible backing having an abrasive coating thereon, wherein the abrasive coating is derived from a slurry which consists essentially of . .from about 20 to about 95 dry weight percent.!. polymerizable resin, . .from about 30 to about 70 dry weight percent.!. abrasive particles, and . .from about 0.01 to about 30 dry weight percent.!. modifying silica particles . .by, based on dry weight of said slurry.!. .Iadd.having a surface area less than about 300 m 2  /gm, and an average particles size less than about 100 millimicrometers, wherein said modifying particles are present in an amount sufficient to reduce viscosity of the slurry.Iaddend.. 
     
     
       2. A coated abrasive in accordance with claim 1 wherein the slurry includes a photoinitiator. 
     
     
       3. A coated abrasive in accordance with claim 1 wherein said polymerizable resin is an addition polymerizable resin. 
     
     
       4. A coated abrasive in accordance with claim 2 wherein said addition polymerizable resin is selected from the group consisting of styrene, divinylbenzene, vinyl toluene, and aminoplast resins having pendant unsaturated carbonyl groups, isocyanurate resins having at least one pendant acrylate group, acrylated urethane resins, epoxy resins, and isocyanate derivatives having at least one pendant acrylate group. 
     
     
       5. A coated abrasive in accordance with claim 4 wherein said isocyanurate resins having at least one pendant acrylate group is the triacrylate of tris(hydroxyethyl) isocyanurate dissolved in trimethylol propane triacrylate. 
     
     
       6. A coated abrasive in accordance with claim 1 wherein said polymerizable resin includes a reactive diluent selected from the group consisting of N-vinylpyrrolidone, hexanediol diacrylate, triethylene glycol diacrylate, and trimethylol propane triacrylate. 
     
     
       7. A coated abrasive in accordance with claim 1 wherein said polymerizable resin, abrasive particles, and modifying particles form a plurality of abrasive composites having at least one shape, said composites being disposed in an array on said flexible backing. 
     
     
       8. A coated abrasive in accordance with claim 7 wherein said at least one shape is a pyramid.