RADIATION CURABLE COMPOSITIONS FOR HYDROPHILIC COATINGS

摘要

A dual cure (radiation-curable and ambient moisture cure) liquid coating composition yielding solid hydrophilic material comprising at least: (A) an acrylate capped polyurethane oligomer of: (1) a polyoxyethylene glycol of molecular weight between 1000 and 2500, (2) a diisocyanate at a ratio of approximately twice the equivalent weight of the polyoxyethylene glycol, and (3) a hydroxyalkyl acrylate sufficient to afford a final radiation curable oligomer terminated in both acrylate and isocyanate functionalities wherein the isocyanate functionality has a percent NCO less than or equal to 1.5%, and (B) a reactive diluent. The cured hydrophilic material is both water absorbing and water transmitting and is found to have useful physical properties.