Patent ID: 8143345
Filing Date: 2012-03-27
Classification: C08G

Abstract:
1. A method of, preparing a fluorinated polyurethane, comprising: (a) reacting a hydroxypolyalkylenoxy derivative of a perfluoropolyoxyalkane with a first isocyanate to produce an isocyanate-terminated compound; (b) reacting the isocyanate-terminated compound with an emulsifier to produce an acid- and hydroxyl-functional compound; (c) reacting the acid- and hydroxyl-functional compound with a second isocyanate to form an acid-functional, isocyanate-terminated compound; (d) reacting the acid-functional, isocyanate-terminated compound with at least one polyol to produce an acid- and hydroxyl-functional compound of higher molecular weight than the acid- and hydroxyl-functional compound produced in (b); and (e) neutralizing acid functional groups of the high molecular weight, acid- and hydroxyl-functional compound to form a fluorinated polyurethane.