Fluorinated polyether isocyanate derived silane compositions

1. A composition comprising a mixture of:

(a) a perfluoropolyether urethane or urea silane or a mixture thereof comprising the reaction product of:

(i) a fluorinated polyether compound of the formula

(T′) y -R f -T  (I)

wherein R f is a monovalent or divalent polyfluoropolyether group; T and T′ each independently represent —CO 2 R 3 , where R 3 is hydroxyalkyl, or —C(O)N(R 1 )(R 2 ), where R 1 is hydroxyalkyl, dihydroxypropyl, or polyalkylenepolyamine and R 2 is hydrogen or R 1 ; and y is 0 or 1; and

(ii) a silane compound of the formula

T″-Q″-SiY 3-x R′ x   (II)

wherein T″ is —NCO; Q″ is —(C n H 2n )—, where n is 2 to 6 ; R′ is an alkyl group of 1-4 carbon atoms; Y is a C 1 -C 4 alkoxy group, a halide, an acyloxy group, or a polyoxyalkylene group; and x is 0 or 1; and

(b) an organic solvent.

2. The composition according to claim 1 wherein T and T′ each independently represent —C(O)N(R 1 )(R 2 ), where R 1 is hydroxyalkyl, dihydroxypropyl, or polyalkylenepolyamine, and R 2 is hydrogen.

3. The composition according to claim 1 wherein R 1 is hydroxyalkyl, dihydroxypropyl, or polyalkylenepolyamine, and R 2 is hydrogen.

4. A composition according to claim 1 , further comprising a fluorosurfactant.

5. A composition according to claim 4 , wherein the fluorosurfactant has the structure

wherein the molar ratio of a:b:c is about 30:about 1 :about 32 and wherein the molecular weight of the fluorosurfactant is about 1,000 to about 4,000 grams per mole, or wherein the fluorosurfactant has the structure

wherein the molar ratio of a′:b′:c′ is about 3:about 3:about 1 and wherein the molecular weight of the fluorosurfactant is about 2,000 to about 40,000 grams per mole, or mixtures thereof.

6. A composition according to claim 1 , wherein said organic solvent is an aliphatic alcohol, a ketone, an ester, an ether, an amide, or a mixture thereof.

7. A composition according to claim 1 , wherein said organic solvent comprises a fluorinated organic solvent.

8. A composition according to claim 1 , wherein R f in Formula (I) is of the formula:

—((R f 3 ) q′ —R f 2 —O) z′ —R f 1 —(O—R f 2 —(R f 3 ) q ) z —  (III)

wherein R f 1 is a perfluorinated alkyl or a perfluorinated alkylene group, R f 2 is a perfluorinated polyalkyleneoxy group consisting of perfluorinated alkyleneoxy groups having 1, 2, 3 or 4 carbon atoms or a mixture of such perfluorinated alkyleneoxy groups; R f 3 is a perfluorinated alkylene group or a substituted perfluorinated alkyl group; q and q′ are independently chosen from 0 or 1; z is from 4 to 30, and z′ is 0 to 30.

9. A composition according to claim 8 , wherein R f 2 comprises repeating units selected from the group consisting of —(C n F 2n O)—,—(CF(Z)O)—, —(C n F 2n CF(Z)O)—, and —(CF 2 CF(Z)O)—, and combinations thereof, wherein n is at least 1 and wherein Z is a fluorine atom, a perfluoroalkyl group, a substituted perfluoroalkyl group, an oxygen-substituted perfluoroalkyl group, a perfluoroalkoxy group, or an oxygen-substituted perfluoroalkoxy group.

10. A composition according to claim 8 , wherein R f 3 comprises repeating units selected from the group consisting of —(C n F 2n )— and —(CF(Z))—, and combinations thereof, wherein n is at least 1 and wherein Z is a fluorine atom, a perfluoroalkyl group, a substituted perfluoroalkyl group, an oxygen-substituted perfluoroalkyl group, a perfluoroalkoxy group, or an oxygen-substituted perfluoroalkoxy group.

11. A composition according to claim 1 , wherein R f is —CF 2 O(CF 2 O) m (C 2 F 4 O) p CF 2 —, —CF 2 O(C 2 F 4 O) p CF 2 —, CF(CF 3 )(OCF 2 (CF 3 )CF) p O(CF 2 ) m O(CF(CF 3 )CF 2 O) p CF(CF 3 )—, CF 3 CF 2 CF 2 O(CF(CF 3 )CF 2 O) p CF(CF 3 )—, or combinations thereof, where an average value for m and p is 0 to 50 and m and p are not independently 0.

12. A composition according to claim 1 wherein R f is CF 3 CF 2 O(CF 2 O) m —(C 2 F 4 O) p CF 2 —, CF(CF 3 )(OCF 2 (CF 3 )CF) p O(CF 2 ) m O(CF(CF 3 )CF 2 O) p CF(CF 3 )—, CF 3 CF 2 O(C 2 F 4 O) p CF 2 —, CF 3 CF(CF 3 )O—(CF(CF 3 )CF 2 O) p CF(CF 3 )—, or combinations thereof, where an average value for m and p is 0 to 50 and m and p are not independently 0.

13. A method for treating a substrate comprising the step of applying a composition according to claim 1 to said substrate.

14. The method according to claim 13 , wherein said method further comprises curing the applied composition at elevated temperature.

15. The method according to claim 13 , wherein said substrate is a ceramic or a glass substrate.

16. The method according to claim 13 , wherein the substrate is an antireflective surface, wherein said coating composition forms an antisoiling coating thereon.

17. A composition comprising:

(a) a perfluoropolyether urethane or urea silane or a mixture thereof comprising the reaction product of:

(i) a fluorinated polyether compound of the formula

(T′) y -R f -T  (I)

wherein R f is a monovalent or divalent polyfluoropolyether group; T and T′ each independently represent —CO 2 R 3 , where R 3 is hydroxyalkyl, or —C(O)N(R 1 )(R 2 ), where R 1 is hydroxyalkyl, dihydroxypropyl, or polyalkylenepolyamine and R 2 is hydrogen or R 1 ; and y is 0 or 1; and

(ii) a silane compound of the formula

T″-Q″-SiY 3-x R′ x   (II)

wherein T″ is —NCO; Q″is —(C n H 2n )—, where n is 2 to 6; R′ is an alkyl group of 1-4 carbon atoms; Y is a C 1 -C 4 alkoxy group, a halide, an acyloxy group, or a polyoxyalkylene group; and x is 0 or 1.

18. The composition according to claim 17 wherein T and T′ each independently represent —C(O)N(R 1 )(R 2 ), where R 1 is hydroxyalkyl, dihydroxypropyl, or polyalkylenepolyamine, and R 2 is hydrogen.

19. The composition according to claim 17 wherein R 1 is hydroxyalkyl, dihydroxypropyl, or polyalkylenepolyamine, and R 2 is hydrogen.

20. An article having a surface, at least a portion of said surface having a coating thereon, said coating comprising a composition according to claim 17 .

21. The article of claim 20 wherein said article is a ceramic or glass substrate.