US5039739A
Expired / Lapsed
US
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Aqueous dispersion of a polyurethane having pendent fluoroalkyl groups
Assignee: Imperial Chemical Industries Ltd
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Filing: 1989-04-26
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Granted: 1991-08-13
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Expires: 2009-04-26
Abstract
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.
Inventors
- 👤 John C. Padget
- 👤 Stephen G. Yeates
- 👤 Richard G. Coogan
- 👤 Gerardus C. Overbeek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:53
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/0804; C08G18/0838; C08G18/0842; C08G18/0861; C08G18/0866; C08G18/28; C08G18/30; C08G18/38; C08G18/3802; C08G18/3804; C08G18/3812; C08G18/40; C08G18/62; C08G18/6275; C08G18/6279; C08G18/63; C08G18/638
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
143 words
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(CF 2 ) n -wherein n is an integer from 0 to 10, or Y and Z together form a -(CF 2 ) 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.
Claim 2
Dependent Claim
143 words
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(CF 2 ) n -wherein n is an integer from 0 to 10, or Y and Z together form a -(CF 2 ) 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.
Claim 3
Dependent Claim
14 words
A dispersion according to claim 1 wherein said fluoro-olefin is tetrafluoroethene, chlorotrifluoroethene or hexafluoropropene.
Claim 4
Dependent Claim
41 words
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.
Claim 5
Dependent Claim
88 words
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.
Claim 6
Dependent Claim
13 words
A coating or film derived from an aqueous dispersion according to claim 1.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-08-12 | 1995-02-11 | 1995-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-08-12 | 1999-02-11 | 1999-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-08-12 | 2003-02-11 | 2003-08-13 | $7700.00 | Window Closed / Lapsed |