Fluorinated polyurethane stain repellents

Abstract

Abstract Fluorinated polyurethanes, useful as stain repellents for textiles, selected from the class consisting of (A) the reaction product formed by sequentially reacting (a) an organic polyol containing 2 to 6 primary or secondary -OH functions, having a molecular weight not exceeding about 2,000 and free of repeating -OCH2CH2- units with (b) Z'' moles (Z'' 3-6) of an organic diisocyanate to form the adduct B(NCO)Z'' wherein J contains 3 to 6 urethane functions and then reacting J(NCO)Z'' with (c) 0.3Z'' to Z'' moles of RfCnH2 (OH)aXR''(OH)b wherein Rf is a perfluoroalkyl group of 4-16 carbon atoms, X O or S, R'' is a di- or trivalent saturated group which may contain in addition to carbon and hydrogen, an ether or thioether linkage, n 1-11, a 0-1, b 1-2, a+b 1, per mole of J(NCO)Z'' and optionally reacting any residual isocyanate functions with (d) a component selected from the class consisting of (1) an aliphatic alcohol of 1-18 carbon atoms; (2) an isocyanate blocking agent; (3) a chain extender of the group low molecular weight diols or diamines and (4) a cross-linking agent selected from the class aminoalcohols, diols and triols, and (B) the reaction product formed by reacting (a'') an organic polyol selected from the group diols and triols, having a molecular weight not exceeding about 2,000 and free of repeating -OCH2CH2- units with (b'') 2-43 moles of an organic diisocyanate per mole of (a'') and (c'') 2-40 moles of RfCnH2 (OH)aXR''(OH)b wherein a+b 2 per mole of (a'') and reacting the product of (a''), (b'') and (c'') with 0-3 moles of (d'') per mole of (a'') which has the values assigned to (d) aforesaid.

Inventors

• 👤 John T Gresham

Bibliographic Details