Curable composition

A fluoropolyether group-containing silane compound represented by the following formula (I):

• wherein
• R3 is each independently at each occurrence a hydrogen atom or a monovalent organic group;
• R4 is each independently at each occurrence a hydroxyl group or a hydrolyzable group;
• p is each independently at each occurrence an integer of 0 to 3,
• provided that, in at least one SiR3pR43-p in (SiR3pR43-p)j, p is an integer of 0 to 2;
• q is each independently at each occurrence an integer of 0 to 3,
• provided that, in at least one SiR3qR43-q in (SiR3qR43-q)j, q is an integer of 0 to 2;
• R5 is each independently at each occurrence a (j+1)-valent organic group;
• R6 is each independently at each occurrence —R16—R15—R17—;
• R15 is each independently at each occurrence a cycloalkylene-containing group;
• R16 is each independently at each occurrence a single bond or a divalent organic group;
• R17 is each independently at each occurrence a single bond or a divalent organic group;
• R7 is each independently at each occurrence a hydrogen atom or a C1-20 alkyl group;
• PFPE1 is each independently at each occurrence —RF—RFE;
• RF is —(CfF2f)—;
• f is an integer of 1 to 10;
• RFE is a divalent fluoropolyether group represented by formula:
• —(OCF2)a1—(OC2F4)a2—(OC3X106)a3—(OC4F8)a4—(OC5F10)a5—(OCF12)a6—(OC7F14)a7—(OC8F16)a8—
• wherein
• a1, a2, a3, a4, a5, a6, a7, and a8 are each independently an integer of 0 to 200 and the sum of a1, a2, a3, a4, a5, a6, a7, and a8 is at least 5,
• the occurrence order of the respective repeating units enclosed in parentheses provided with the subscript a1, a2, a3, a4, a5, a6, a7, or a8 is not limited in the formula, and
• X10 is each independently at each occurrence a hydrogen atom, a fluorine atom, or a chlorine atom, provided that at least one of a1, a2, a4, a5, a6, a7, and a8 is an integer of 1 or more when all X10 is a hydrogen atom or a chlorine atom;
• j is independently at each occurrence an integer of 1 to 9;
• and
• k is an integer of 1 or more.