Fluorine-containing curable composition and article

A curable fluorinated composition comprising as essential components, component (A) which is a fluorinated acrylic compound in the form of a linear polymer having a fluoropolyether backbone, having a trifluoromethyl group at one end of the molecule and at least two (meth)acryloyl groups at the other end of the molecule, and having the general formula (1):

• RfA—Z1-Q1[X1]a (1)
• wherein RfA is a monovalent perfluoropolyether group having a trifluoromethyl group at the opposite end to the end of attachment to Z1, which is represented by Rf1—O—Rf2—CF2—,
• wherein Rf1 is a C1-10 perfluoroalkyl group having a trifluoromethyl group at the opposite end to the end of attachment to the oxygen atom, which may contain oxygen, and Rf2 is a divalent perfluoropolyether group consisting of randomly arranged repeat units of one or more types selected from the following four types:
• —CF2O—,
• —CF2CF2O—,
• —CF2CF2CF2O—, and
• —CF2CF2CF2CF2O—,
• Z1 is a linking group in the form of a C1-20 divalent hydrocarbon group which may contain at least one heteroatom selected from oxygen, nitrogen, and silicon, which may contain a cyclic structure therein, and in which some carbon-bonded hydrogen may be substituted by fluorine,
• Q1 is a (a+1)-valent linking group containing at least (a+1) number of silicon atoms, which may take a cyclic structure,
• “a” is an integer of 2 to 5, and
• X1 is independently a monovalent organic group having a (meth)acryloyl group which may contain at least one heteroatom selected from oxygen, nitrogen, and silicon,
• component (B) which is a compound in the form of a linear polymer having a fluoropolyether backbone, having at least two (meth)acryloyl groups at each end of the molecule, and having on the average 4 to 10 (meth)acryloyl groups per molecule, and
• component (C) which is a non-fluorinated acrylic compound free of fluoropolyether structure and having on the average at least two (meth)acryloyl groups per molecule,
• wherein the total amount of components (A) and (B) blended is 0.05 to 50 parts by weight per 100 parts by weight of component (C), and the amount of component (A) blended is 1 to 100 parts by weight per 100 parts by weight of component (B).