Binder for coated abrasives

Abstract From the Canadian patent

This invention relates to abrasive products having a resinous binder which bonds abrasive granules to a backing sheet or to a fibrous sheet. In the manufacture of coated abrasives a make, coat and abrasive granules are first applied to a backing the make coat is partially cured, then a size coat is applied, and the resulting construction is fully cured. Generally the binders for the make coat and size coat are thermally curable resins. In order to obtain proper coating viscosities with thermally curable resins, solvent is added to these resins. With polyester or cellulose backings however, curing temperatures are limited to about 130°C. At this temperature, cure times are long. The long …