Fray and stretch resistant coated abrasive substrates impregnated with epoxy resins cured by specific types of catalysts

In a coated abrasive product having a backing comprising continuous synthetic multifilament yarns, the improvement wherein said continuous synthetic multifilament yarns are impregnated to an extent of at least 15% of the mass of the yarns with a material which is the cured product of a liquid saturant comprising:

• (a) an epoxide resin with an epoxide equivalent weight between 150 and 600;
• and
• (b) a curing agent selected from the group consisting of
• (i) an amount of dicyandiamide within the range of 15-100 grams for each epoxide gram equivalent weight present in the epoxide resin specified in part (a),
• (ii) an amount of imidazole or alkyl or aryl substituted imidazole corresponding to from 1 to 5 percent by weight of the amount of epoxide resin specified in part (a), and
• (iii) an amount of an organic compound comprising at least two reversibly blocked isocyanate groups per molecule corresponding to from 5 to 20 percent by weight of the amount of epoxide resin specified in part (a).