| abstract |
Soluble, sulfur-curable polyetherurethanes, reaction products of organic diisocyanates and polyalkyleneether glycols, which are chain extended with an active hydrogen bearing compound such as a nonpolymeric glycol, with either main chain unsaturation or side chains containing terminal -CH = CH2 groups present in any of the active hydrogen bearing reactants, are sensitized with aromatic ketones and insolubilized by exposure to U.V. light (3,100* 4,300* A). Plates for flexographic printing are prepared from these materials. |