| abstract |
A PHOTOPOLYMERIZABLE COMPOSITION COMPRISED OF A MIXTURE OF (1) A POLYACRYLATE PREPARED BY REACTING (A) A POLYACETATE CONDENSATION PRODUCT OF A POLYESTER HAVING A EXCESS OF HYDROXYL GROUPS AND A SUBSTITUTED ACETIC ACID HAVING THE FORMULA X-CH2-COOH WHERE X IS AN ELECTRON WITHDRAWING GROUP AND (B) AN ALDEHYDE HAVING THE FORMULA R-CHO WHERE R IS HYDROGEN, ALKYL ARYL OR FURYL, THE POLYESTER BEING PREPARED FROM THE CONDENSATION OF A SATURATED POLYHYDRIC ALCOHOL AND A SATURATED DICARBOXYLIC ACID, (2) A POLYMERIZABLE UNSATURATED POLYESTER PREPARED FROM A POLYHYDRIC ALCOHOL AND AN ALPHA, BETA-ETHYLENICALLY UNSATURATED MONOCARBOXYLIC ACID AND (3) A PHOTOSENSITIZER SUCH AS A CHLORINATED POLYPHENYL. THE PHOTOPOLYMERIZABLE COMPOSITIONS ARE USEFUL IN THE PREPARATION OF VEHICLES FOR PRINTING INKS WHICH WHEN PRINTED ON A SUBSTRATE DRY RAPIDLY TO A NON-OFFSETTING CONDITION UNDER IRRADIATION WITH ULTRAVIOLET LIGHT. |