Composite abrasive wheels
AssigneeNorton Company
InventorsShyiguei Hsu, Michael P. Brock
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Abstract
A composite abrasive wheel with improved thermal properties is comprised of a fibrous substrate with abrasive particles adhered thereto by a crosslinked polyurethane binder comprising heterocyclic groups. The heterocyclic structures, such as isocyanurate and/or oxazolidone rings, in the binder system improve the thermal properties required for a tough, durable abrasive wheel.
Claims9
A polyurethane having a softening temperature above 65.degree. C. formed by the reaction, in the presence of a curing agent, of an isocyanate-terminated polymer with an hydroxyl-containing organic compound in proportions to provide an --NCO/--OH ratio of at least 1.5 to yield a crosslinked polyurethane comprising isocyanurate and/or oxazolidone structures.
A polyurethane having a softening temperature above 50.degree. C. formed by the reaction, in the presence of a tertiary amine curing agent, of a mixture of a polyol and an epoxy resin with an isocyanate-terminated polymer having branch chains terminating in isocyanate groups in proportions such that the ratio of terminal linear isocyanate groups to branch chain isocyanate groups is at least 0.09, the ratio of isocyanate to epoxy groups after reaction with all primary hydroxyl groups present is not greater than 12.0, and the ratio of --NCO/--OH groups is at least 4.0.
Dependencies are inferred from the claim text.