Coated abrasive bonded with urea-formaldehyde, phenolic resin blends
AssigneeNorton Company
InventorStanley J. Supkis
Life of this patent
Estimating the term…
Abstract
Abrasive articles containing abrasive grits bonded to a support are made with a resinous bond consisting of urea formaldehyde prepolymer blended with a phenolic A-stage resin and finally cured under basic conditions.
Claims7
An abrasive product comprising abrasive grits bonded to a fibrous backing by a basic cured condensation product of a urea formaldehyde prepolymer and a phenolic prepolymer resin, the ratio of phenolic prepolymer solids to urea formaldehyde prepolymer solids being from 9/1 to 1/9.
An abrasive product comprising abrasive grits bonded to a fibrous backing by a condensation product of a urea formaldehyde prepolymer and a phenolic prepolymer resin, the ratio of phenolic prepolymer solids to urea formaldehyde prepolymer solids being from 9/1 to 1/9, said condensation product includes a particulate calcium carbonate filler.
A method of making an abrasive product comprising adhering abrasive grits to a fibrous backing by a liquid adhesive which is a mixture of a urea formaldehyde and a phenol formaldehyde prepolymer, said mixture having a pH between 7 and 10, and curing the adhesive by heat.
Dependencies are inferred from the claim text.