Fluorooxyalkylene group-containing polymer composition, a surface treatment agent comprising the same and an article treated with the agent
An object of the present invention is to provide a fluorooxyalkylene group-containing polymer composition, which yields a coating having excellent adhesior to a substrate, good water- and oil-repellency, a low dynamic friction coefficient, good releasing property, good abrasion resistance and good stain resistance, and to provide a surface treatment agent comprising the same. The present inventors have found that a composition comprising a fluorooxyalkylene group-containing polymer having a fluorinated group and a hydrolyzable group at each terminal and a fluorooxyalkylene group-containing polymer having hydrolyzable groups at both terminals can form a coating which has excellent water- and oil-repellency, a low dynamic friction coefficient, good releasing property, good abrasion resistance, and good stain resistance.
1. A fluorooxyalkylene group-containing polymer composition comprising a fluorooxyalkylene group-containing polymer having a hydrolyzable group at one terminal and a fluorooxyalkylene group-containing polymer having hydrolyzable groups at both terminals
wherein the fluorooxyalkylene group-containing polymers are represented by the following formula (1):
A-Rf 1 -B (1)
wherein
Rf 1 is a divalent linear fluorooxyalkylene group having 5 to 100 repeating units represented by —C d F 2d O—, wherein d is, independently of each other, an integer of from 1 to 6; and
A and B are, independently of each other,
an Rf 2 group, wherein Rf 2 is selected from the group consisting of F, H and a monovalent fluorinated group having a CF 3 or CF 2 H group at the terminal, or
a group represented by the following formula (2)
wherein
Q is a divalent organic group,
Z is a divalent to septivalent organopolysiloxane group having a siloxane bond, which is a linear or cyclic organopolysiloxane moiety having 2 to 5 silicon atoms,
R is an alkyl group having 1 to 4 carbon atoms or a phenyl group,
X is a hydrolyzable group,
a is 2 or 3, and
b is an integer of from 1 to 6,
c is an integer of from 1 to 5, and
β is 1;
wherein the terminal Rf 2 group accounts for 30 to 75 mole %, relative to a total of all of the terminal groups in the composition.
2. The fluorooxyalkylene group-containing polymer composition according to claim 1 , wherein the composition comprises
40 to 90 mole % of the fluorooxyalkylene group-containing polymer having a hydrolyzable group at one terminal, and
10 to 60 mole % of the fluorooxyalkylene group-containing polymer having hydrolyzable groups at both terminals.
3. The fluorooxyalkylene group-containing polymer composition according to any one of claims 1 and 2 , wherein
Rf 1 is a divalent linear fluorooxyalkylene group represented by the following formula (5);
—CF 2 (OC 2 F 4 ) f (OCF 2 ) g OCF 2 — (5)
wherein f is an integer of from 0 to 80, g is an integer of from 1 to 80, and a total of f and g is from 5 to 100, and these repeating units may be sequenced at random.
4. The fluorooxyalkylene group-containing polymer composition according to claim 1 , wherein
Q is a hydrocarbon group having 2 to 12 carbon atoms and may have one or more bond selected from the group consisting of an amide bond, an ether bond, an ester bond and a vinyl bond.
5. The fluorooxyalkylene group-containing polymer composition according to claim 1 , wherein
X is a group selected from the group consisting of alkoxy groups, oxyalkoxy groups, acyloxy groups, alkenyloxy groups and halogen atoms.
6. A surface treatment agent comprising a fluorooxyalkylene group-containing polymer composition comprising a fluorooxyalkylene group-containing polymer having a hydrolyzable group at one terminal and a fluorooxyalkylene group-containing polymer having hydrolyzable groups at both terminals
wherein the fluorooxyalkylene group-containing polymers are represented by the following formula (1):
A-Rf 1 -B (1)
wherein
Rf 1 is a divalent linear fluorooxyalkylene group having 5 to 100 repeating units represented by —C d F 2d O—, wherein d is, independently of each other, an integer of from 1 to 6; and
A and B are, independently of each other,
an Rf 2 group, wherein Rf 2 is selected from the group consisting of F, H and a monovalent fluorinated group having a CF 3 or CF 2 H group at the terminal, or
a group represented by the following formula (2)
wherein
Q is a divalent organic group,
Z is a divalent to septivalent organopolysiloxane group having a siloxane bond, which is a linear or cyclic organopolysiloxane moiety having 2 to 5 silicon atoms,
R is an alkyl group having 1 to 4 carbon atoms or a phenyl group,
X is a hydrolyzable group,
a is 2 or 3, and
b is an integer of from 1 to 6,
c is an integer of from 1 to 5, and
β is 1;
wherein the terminal Rf 2 group accounts for 30 to 75 mole %, relative to a total of all of the terminal groups in the composition,
and/or a condensate of a hydrolyzate obtained by partially hydrolyzing the polymer composition.
7. An article treated with the surface treatment agent according to claim 6 .
8. An optical article treated with the surface treatment agent according to claim 6 .