Abrasive wheels

Claim 2

An abrasive wheel comprising: (a) a matrix of organic material; (b) abrasive granules dispersed throughout and adhered in said matrix; and (c) a binder system adhering said abrasive granules in said matrix, said binder system comprising a blend of: (1) binder having an initial liquid state and being curable to a tough adherent polyurethane material which in the unmodified state will firmly adhere said abrasive granules in said matrix of said wheel but, when said wheel is rotated against a workpiece under heat-generating conditions such as high wheel to workpiece pressure and surface speed, may smear onto the surface of the workpiece; and (2) sufficient smear-reducing quantity of a smear-reducing compatible polymer having a glass transition of at least 50° C. to endow the blend with a glass transition of at least 40° C.

Claim 3

The abrasive wheel of claim 1 wherein said compatible polymer has a molecular weight of at least about 2000.

Claim 4

The abrasive wheel of claim 1 wherein said compatible polymer is selected from the group consisting of phenoxy resin, epoxy resin, hydroxyl-terminated polyvinyl chloride resin, styrene allyl alcohol copolymer, and mixtures thereof.

Claim 5

The abrasive wheel of claim 1 wherein said tough adherent polymeric material has tensile strength of at least about 20×10 6 Pa and elongation at break of at least about 100%.

Claim 6

The abrasive wheel of claim 1 wherein said binder system contains a lubricating amount of conventional lubricant.

Claim 7

The abrasive wheel of claim 1 wherein said matrix is an open, lofty, nonwoven, fibrous matrix.

Claim 8

The abrasive wheel of claim 1 wherein said smear-reducing quantity is at least about 10% by weight based on the total weight of the cured binder system.

Claim 9

The abrasive wheel of claim 7 wherein said smear-reducing quantity is from about 20 to 50% by weight.

Claim 10

The abrasive wheel of claim 1 wherein said binder system consists essentially of said blend.

Claim 11

An abrasive wheel comprising: (a) a matrix of organic material; (b) abrasive granules dispersed throughout and adhered in said matrix; and (c) a binder system adhering said abrasive granules in said matrix, said binder system comprising a copolymer having a glass transition temperature of at least 40° C. formed of: (1) a first monomeric material which will polymerize to form a tough adherent polymeric material which will firmly adhere the abrasive granules in said matrix of said wheel but, when said wheel is rotated against a workpiece under heat-generating conditions such as high wheel to workpiece pressure and surface speed, may smear onto the surface of the workpiece; (2) a second monomeric material, polymerizable with said first monomeric material, in a sufficient quantity and of a type to endow said copolymer with a glass transition temperature of at least 40° C.

Claim 12

An abrasive wheel comprising: (a) a matrix of organic material; (b) abrasive granules dispersed throughout and adhered in said matrix; and (c) a binder system adhering said abrasive granules in said matrix, said binder system comprising a copolymer having a glass transition temperature of at least 40° C. formed of: (1) a first monomeric material which will polymerize to form a tough adherent polymeric material which will firmly adhere the abrasive granules in said matrix of said wheel but, when said wheel is rotated against a workpiece under heat-generating conditions such as high wheel to workpiece pressure and surface speed, may smear onto the surface of the workpiece; (2) a second monomeric material, polymerizable with said first monomeric material, in a sufficient quantity and of a type to endow said copolymer with a glass transition temperature of at least 40° C.

Claim 13

The abrasive wheel of claim 10 wherein said second monomeric material is a bisphenol A diglycidyl ether.