Process for obtaining textured coatings from photo-curable urea-containing compositions

A process for preparing an ultraviolet light-cured coating having a textured appearance in the as-cured material, which process comprises exposing a photocurable composition in contact with an atmosphere to ultraviolet light for a sufficient length of time to cure the composition and wherein the photocurable composition comprises:

• i) an aromatic ketone photosensitizer;
• ii) a multifunctional urea compound of the formula ##STR13## where R is an initiator radical based on a compound containing Zerewitinoff active hydrogen atoms other than thiol active hydrogen atoms and contains from two to six carbon atoms, Q.sup.1 is a group of the formula:
• ##STR14## Q.sup.2 is a group of the formula ##STR15## Q.sup.3 is a group of the formula:
• ##STR16## Q.sup.4 is a tertiary amine-containing group of the formula:
• ##STR17## wherein a has a value of from zero to 175, b has a value of 3 to 98, c has a value of zero to 30, n is an integer of from 1 to 3, y has a value of zero to u, u has a value of 0.3 to 1.0, R' is an alkyl group of 2 to 18 carbons, R" is hydrogen or an alkyl group of one to 18 carbon atoms, R"' and R"" are independently an alkyl group of 2 to 12 carbon atoms, Q.sup.5 is a group represented by the formula:
• ##STR18## wherein R.sup.5 is an isopropenyl-substituted .alpha.,.alpha.-dimethylbenzyl group, p is a mole fraction and ranges from zero to 1.0, s is a mole fraction and ranges from zero to 1.0, t is a mole fraction and ranges from zero to 0.7, the quantity (p+s+t) equals one, w is a mole fraction and ranges from 0.3 to 1.0, z is an integer from 2 to six and (zw) is the product of z and w, and
• iii) an ethylenically unsaturated compound that will undergo photopolymerization selected from the group consisting of monoacrylates, diacrylates, triacrylates and higher functionality acrylates.