Coated abrasive material

Claim 1

In coated abrasive material comprising a flexible backing member, an adhesive bond on the front surface of said backing member, and abrasive grains firmly affixed by the adhesive bond to the backing member, a multiplicity of said abrasive grains extending outwardly from the adhesive bond, the improvement comprising a supersize coating over the adhesive bond which adhesive bond comprises a maker adhesive and a size adhesive, the size adhesive at least comprising a first heat hardened resinous composition, and said supersize coating over said heat hardened coating comprising a dried, fused, elastomeric material selected from the group consisting of polymers of a monomer which when polymerized results in substantial residual unsaturation and copolymers of such aforementioned monomer with at least one monomer copolymerizable therewith, said elastomeric material being active in increasing the cutting ability of the coated abrasive material, and said coating including a sufficient amount of antioxidant therein, at least 4% by weight, said antioxidant selected from the group consisting of napthylamines, alkylated phenols, polyalkyl polyphenols, hydroquinones, and mixtures thereof whereby said elastomeric material is stabilized against decomposition by heat generated while the coated abrasive material is being used, said supersize coat including a solid particulate metal fluoride grinding aid in an amount not more than 60% of the total supersize coating weight.