Coated abrasives with rapidly curable adhesives
AssigneeNorton Company
InventorsStanley J. Supkis, Eugene Zador, Sitaramaiah Ravipati, Richard A. Romano, Walter A. Yarbrough
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Abstract
A coated abrasive having improved properties of grinding performance and brittleness, said abrasive comprising a backing and an abrasive coating adhered thereon wherein the abrasive coating comprises a suspension containing lapping size abrasive grains and a binder, said binder containing a diacrylated monomer and a triacrylated or higher acrylated monomer.
Claims33
A coated abrasive sheet material suited for the second fining of lenses, said coated abrasive sheet material including a backing having on one major surface thereof a coating with an outer surface roughness of from 1.2 to 6 microns arithmetic average, said coating being the cured product of a slurry of adhesive and abrasive comprising:
- (a) an adhesive component comprising, in percentages of the total acrylate content of said adhesive component, (i) from 100% to 36% by weight of triacrylated monomers, (ii) from 0-46% by weight of diacrylated monomers, and (iii) from 0-33% by weight of acrylated oligomers;
- and
- (b) white aluminum oxide abrasive grain having at least 70 volume percent of its particles with sedimentation characteristics equivalent to those of spherical particles with diameters of from 7 to 20 microns and an average particle size of from 10 to 14 microns, said abrasive grain being present in the slurry in a weight ratio to the adhesive component of from 1.0 to 2.5.
A coated abrasive suitable for use as a lapping material, said coated abrasive comprising:
- (a) a backing;
- and
- (b) an abrasive coating adhered to said backing, said abrasive coating being formed by coating a suspension comprising lapping size abrasive grains, and a binder including at least one diacrylated monomer and at least one triacrylated or higher acrylated monomer and at least one acrylated oligomer onto said backing, and curing said binder by free-radical polymerization.
Method of preparing a coated abrasive comprising the steps of:
- (a) providing a coatable composition comprising a binder including a diacrylated monomer, a triacrylated or higher acrylated monomer, and an acrylated oligomer curable by free-radical polymerization and having lapping size abrasive grains suspended therein,
- (b) coating said coatable composition on a backing, and
- (c) curing said composition by means of free-radical polymerization.
Method of preparing a coated abrasive comprising the steps of:
- (a) providing a coatable composition comprising a binder curable by UV or thermal and UV free-radical polymerization having lapping size abrasive grains suspended therein,
- (b) coating said coatable composition on a backing, and
- (c) curing said composition by means of UV or thermal and UV free-radical polymerization, wherein said composition includes an adhesion promoter.
A coated abrasive sheet material comprising a flexible web backing, abrasive grain dispersed over at least one major surface of the backing, and a making adhesive layer between said surface and said abrasive grain, cured by free-radical polymerization and attaching the abrasive grain to the backing, the making adhesive layer comprising at least one acrylated monomer, at least one triacrylated or higher acrylated monomer, and at least one acrylated oligomer.
Dependencies are inferred from the claim text.