Fluoropolyether-containing polymer-modified silane, surface treating agent, and treated article
A fluoropolyether-containing polymer-modified silane has general formula (1) wherein Rf is a monovalent fluorooxyalkyl or divalent fluorooxyalkylene-containing polymer residue, Y is a divalent to hexavalent hydrocarbon group which may have a silicon atom and/or a siloxane bond, W is a divalent to hexavalent hydrocarbon group which may have a silicon atom and/or a siloxane bond, R is independently an alkyl of 1 to 4 carbon atoms or phenyl, X is independently hydroxyl or a hydrolyzable group, the letters n, a and m are respectively integers from 1 to 3, 1 to 5 and 1 to 5, and α is 1 or 2. A surface treating agent containing this silane and/or a partial (hydrolytic) condensate thereof, when applied to an article, forms a coat of excellent water/oil repellency and abrasion resistance.
1. A fluoropolyether-containing polymer-modified silane having general formula (1)
wherein Rf is a monovalent fluorooxyalkyl or divalent fluorooxyalkylene-containing polymer residue,
Y is at least one of divalent to tetravalent groups being selected from the following formulae:
—CH 2 CH 2 CH 2 —,
—CH 2 CH 2 CH 2 CH 2 —,
—CH 2 CH 2 CH 2 CH 2 CH 2 —,
—CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 —,
W is at least one of divalent to tetravalent groups being selected from the following formulae:
—CH 2 CH 2 —,
—CH 2 CH 2 CH 2 —,
—CH 2 CH 2 CH 2 CH 2 —,
—CH 2 CH 2 CH 2 CH 2 CH 2 —,
—CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 —,
R is independently an alkyl group of 1 to 4 carbon atoms or a phenyl group,
each X is independently selected from the group consisting of hydroxyl, alkoxy groups of 1 to 10 carbon atoms, alkoxyalkoxy groups of 2 to 10 carbon atoms, acyloxy groups of 1 to 10 carbon atoms, alkenyloxy groups of 2 to 10 carbon atoms, and halogen groups,
n is an integer from 1 to 3,
a is an integer from 1 to 3,
m is an integer from 1 to 3, and
α is 1 or 2.
2. The polymer-modified silane of claim 1 , wherein α in formula (1) is 1 and Rf is a moiety of general formula (2)
F—(CF 2 O) p —(C 2 F 4 O) q —(C 3 F 6 O) r —(C 4 F 8 O) s —C d F 2d — (2)
wherein p, q, r and s are each an integer from 0 to 200, the sum p+q+r+s=3 to 200, each recurring unit may be linear or branched, individual recurring units may be randomly arranged, d is an integer from 1 to 3, and the C d F 2d unit may be linear or branched.
3. The polymer-modified silane of claim 1 , wherein α in formula (1) is 2 and Rf is a moiety of general formula (3)
—C d F 2d —O(CF 2 O) p —(C 2 F 4 O) q —(C 3 F 6 O) r —(C 4 F 8 O) s —C d F 2d — (3)
wherein p, q, r and s are each an integer from 0 to 200, the sum p+q+r+s=3 to 200, each recurring unit may be linear or branched, individual recurring units may be randomly arranged, d is an integer from 1 to 3, and the C d F 2d units may be linear or branched.
4. The polymer-modified silane of claim 1 which has any one of the following formulas:
wherein p1 is an integer from 5 to 100, q1 is an integer from 5 to 100, and the sum p1+q1 is an integer from 10 to 105.
5. A surface treating agent comprising the polymer-modified silane of claim 1 and/or a partial (hydrolytic) condensate thereof.
6. An article surface-treated with the surface treating agent of claim 5 .