Process for preparing a UV-curable coating material and anti-abrasion coating composition

A process for preparing a UV-curable coating material comprising the steps of

• effecting a hydrolysis reaction of (a-1) 40 to 90 parts by weight (on a solid basis) of colloidal silica wherein the dispersion medium is a polar solvent, and (a-2) 60 to 10 parts by weight of a hydrolyzate and/or hydrolyzed and partially condensed product of an alkoxy silane compound containing not less than 50% by weight of a compound of the general formula (I) ##STR3## wherein X is CH.sub.2 .dbd.CH--COO--, CH.sub.2 .dbd.C(CH.sub.3)--COO-- or CH.sub.2 .dbd.CH--, R.sup.1 is a direct bond or an alkylene group having 1 to 8 carbon atoms, R.sup.2 and R.sup.3 are alkyl groups having 1 to 8 carbon atoms, a is a whole number of 1 to 3, b is a whole number of 0 to 2, and (a+b) has a value of 1 to 3;
• replacing the dispersion medium of the colloidal silica with a nonpolar solvent when the amount of dehydration is in the range of 30 to 90% of theoretical value;
• and
• effecting a further condensation reaction while maintaining in the state of 30 to 90% by weight of solid components in the presence of the nonpolar solvent.