| 20090149596 | WATER DISPERSIBLE, HYDROXYL-TERMINATED, FLUORINATED POLYURETHANES AND METHOD OF PREPARING THE SAME - Fluorinated polyurethanes and methods of making the same are provided. The fluorinated polyurethanes are useful for making polyurethane coating compositions for use in aerospace and other applications. The method includes a “split process” by which a hydroxypolyalkylenoxy derivative of a perfluoropolyoxyalkane is separately reacted with isocyanate to produce an isocyanate-terminated compound. The isocyanate-terminated compound is then reacted with an emulsifier to produce an acid- and hydroxyl-functional compound. The acid- and hydroxyl-functional compound is then reacted with isocyanate to form an acid-functional, isocyanate-terminated compound. The acid-functional, isocyanate-terminated compound is then reacted with at least one polyol to produce a higher molecular weight, acid- and hydroxyl-functional compound. Finally, the acid functional groups of the high molecular weight, acid- and hydroxyl-functional compound are neutralized to form a fluoro-urethane salt which is dispersed in water. The resulting fluorinated polyurethane can be used to prepare a polyurethane coating composition. | 06-11-2009 |
