Aqueous dispersion of a polyurethane having pendent fluoroalkyl groups

• US 5,039,739 A
• Filed: 04/26/1989
• Issued: 08/13/1991
• Est. Priority Date: 04/26/1988
• Status: Expired due to Fees

• Current Assignee: ICI Resin BV, Imperial Chemical Industries PLC (IMPERIAL CHEMICAL INDUSTRIES), ICI America Incorporated (Nouryon BV)
• Original Assignee: ICI Resin BV, Imperial Chemical Industries PLC (IMPERIAL CHEMICAL INDUSTRIES), ICI America Incorporated (Nouryon BV)
• Inventors: Overbeek, Gerardus C., Padget, John C., Yeates, Stephen G., Coogan, Richard G.
• Primary Examiner(s): Kight, III, John
• Assistant Examiner(s): NOT, DEFINED
• Application Number:
  US07/343,206
• Time in Patent Office: 839 Days
• Field of Search: 524/589, 524/839, 524/840, 524/591
• US Class Current: 524/839
• CPC Class Codes: C08G 18/0804 Manufacture of polymers containing ionic or ionogenic groups
• CPC Class Codes: C08G 18/0866 the dispersing or dispersed phase being an aqueous medium
• CPC Class Codes: C08G 18/3812 having fluorine atoms
• CPC Class Codes: C08G 18/6279 containing fluorine atoms
• CPC Class Codes: C08G 18/638 characterised by the use of compounds having carbon-to-carbon double bonds other than styrene and/or olefinic nitriles

Abstract

An aqueous dispersion of a water-dispersible polyurethane having pendent fluoroalkyl groups, said polyurethane being the product of chain extending, in aqueous medium, a water-dispersible, isocyanate-terminated polyurethane prepolymer having pendent fluoroalkyl groups.

Claims

1. An aqueous dispersion of a water-dispersible polyurethane having pendent fluoroalkyl groups, said polyurethane being the product of chain extending, in aqueous medium, a water-dispersible, isocyanate-terminated polyurethane prepolymer obtained by reacting a stoichiometric excess of an organic polyisocyanate with an isocyanate-reactive component containing at least one organic polyol having pendent fluoroalkyl groups, said polyol being a product obtained by the free radical addition of a fluoro-olefin having the general formula:

##STR7## wherein Y represents F and Z represents Cl or F(CF₂)_n -wherein n is an integer from 0 to 10, or Y and Z together form a -(CF₂)_m -chain wherein m represents an integer from 2 to 4 and x is a positive integer which must be 1 when Z is not F, to a polytetramethylene glycol having a molecular weight in the range from 162 to 5,000.

2. A dispersion according to claim 1 wherein said fluoro-olefin is tetrafluoroethene, chlorotrifluoroethene or hexafluoropropene.

3. A dispersion according to claim 1 wherein said prepolymer is a product obtained by reacting said organic polyisocyanate with said organic polyol having pendent fluoroalkyl groups and a compound containing a hydrophilic centre and at least two isocyanate or isocyanate-reactive groups.

4. A dispersion according to claim 3 comprising a water-dispersible polyurethane and a vinyl polymer, the polyurethane being the product of reacting

(a) a water-dispersible, isocyanate-terminated polyurethane prepolymer formed by reacting said organic polyisocyanate with said organic polyol having pendent fluoroalkyl groups, said prepolymer comprising a hydrophilic centre and at least two isocyanate or isocyanate-reactive groups and optionally one ore more polyols having a molecular weight in the range 62 to 6,000 and being free from fluorine atoms and hydrophilic centres, and

(b) an active hydrogen containing chain extender.

5. A coating or film derived from an aqueous dispersion according to claim 1.