Siloxane acrylate having perfluoropolyether group
Provided is a fluorine-containing siloxane acrylate represented by formula (1). X—Z-PFPE-Z—X (1) [PFPE is a divalent perfluoropolyether chain, X is a group represented by formula (2) {Y 1 is a divalent organic group, R 2 is a hydrogen atom, a fluorine atom, a methyl group, or a trifluoromethyl group, and G is a monovalent hydrocarbon group or a group represented by formula (3) O—Si(CH 3 ) 2 —Y 1 —OR 1 (3) (R 1 is a monovalent hydrocarbon group, and Y 1 is same as mentioned above. The broken line represents a bond (hereinafter, the same shall apply.)) Q is a hydrogen atom or a group represented by formula (4) SiR 3 3 (4) (R 3 is a monovalent hydrocarbon group.) e is an integer of 0-2, f is an integer of 0-2, and g is an integer of 1-3, and e+f+g is 3.} Z is a predetermined divalent organic group].
1 . A fluorinated siloxane acrylate having the formula (1):
X—Z-PFPE-Z—X (1)
wherein PFPE is a divalent perfluoropolyether chain having a number average molecular weight of 500 to 30,000,
X is each independently a group having the formula (2):
wherein Y 1 is each independently a divalent organic group having any one of the following formulae:
wherein the broken line designates a valence bond, and the asterisk (*) designates a point of attachment to the silicon atom, R 2 is each independently hydrogen, fluorine, methyl or trifluoromethyl, and G is each independently a C 1 -C 12 alkyl group or a group having the formula (3):
wherein R 1 is a C 1 -C 12 monovalent hydrocarbon group, Y 1 is as defined above, and the broken line designates a valence bond, Q is hydrogen or a group having the formula (4):
wherein R 3 is each independently a C 1 -C 12 monovalent hydrocarbon group and the broken line designates a valence bond, e is an integer of 0 to 2, f is an integer of 0 to 2, and g is an integer of 1 to 3, and e+f+g=3, and the broken line designates a valence bond,
Z is each independently a divalent organic group having any one of the following formulae:
wherein the broken line designates a valence bond, and the double asterisk (**) designates a point of attachment to the PFPE.
2 . The fluorinated siloxane acrylate of claim 1 wherein PFPE is a perfluoropolyether chain having a number average molecular weight of 1,000 to 5,000, represented by the following formula:
- - - CF 2 (OCF 2 ) a (OCF 2 CF 2 ) b OCF 2 - - - (6)
wherein a is a number of at least 1, b is a number of at least 1, a/b is a number from 1/10 to 10/1, the arrangement of repeating units in parentheses with a and b may be arbitrary, and the broken line designates a valence bond.
3 . The fluorinated siloxane acrylate of claim 1 wherein Z is a divalent organic group having any one of the following formulae:
wherein the broken line designates a valence bond, and the double asterisk (**) designates a point of attachment to the PFPE.
4 . The fluorinated siloxane acrylate of claim 1 wherein e is 1 or 2, G is a C 1 -C 6 alkyl group or a group having formula (3) wherein R 1 is methyl, ethyl or n-propyl.
5 . The fluorinated siloxane acrylate of claim 4 wherein G is a C 1 -C 3 alkyl group.
6 . The fluorinated siloxane acrylate of claim 1 wherein e is 0.
7 . A coating composition comprising the fluorinated siloxane acrylate of claim 1 .
8 . The coating composition of claim 7 , further comprising an acrylate or urethane acrylate other than the fluorinated siloxane acrylate having the formula (1).
9 . An article comprising a coating in the form of a cured product of the coating composition of claim 7 .