Fluoropolyether group-containing compound

A fluoropolyether group-containing compound of the following formula (1):

• wherein:
• RF1 is Rf1—RF—Oq—;
• Rf1 is a methyl group optionally substituted with one or more fluorine atoms;
• RF is each independently at each occurrence a group represented by the formula:
• —(OC6F12)a—(OC5F10)b—(OC4F8)c—(OC3RFa6)d—(OC2F4)e—(OCF2)f—;
• a, b, c, and d are each independently an integer of 0 or more and 30 or less, e and f are each independently an integer of 1 or more and 200 or less;
• the sum of a, b, c, d, e, and f is at least 5 or more;
• the occurrence order of the respective repeating units enclosed in parentheses provided with a subscript a, b, c, d, e, or f is not limited in the formula;
• and a ratio of e to f is 0.9 or more;
• RFa is each independently at each occurrence a hydrogen atom, a fluorine atom, or a chlorine atom;
• q is independently 0 or 1;
• RSi is each independently at each occurrence represented by the following formula (S1):
• —X1—SiRa1p1Rb1q1Rc1r1 (S1);
• X1 is each independently at each occurrence a single bond, an oxygen atom, or a divalent organic group;
• Ra1 is each independently at each occurrence —Z1′—SiRa1′p1′Rb1′q1′Rc1′r1′;
• Z1′ is each independently at each occurrence a single bond, an oxygen atom, or a divalent organic group;
• Ra1′ is each independently at each occurrence —Z1″—SiRa1″p1″Rb1″q1″Rc1″r1″;
• Z1″ is each independently at each occurrence a single bond, an oxygen atom, or a divalent organic group;
• Ra1″ is each independently at each occurrence —Z1′″—SiRa1′″p1′″Rb1′″q1′″Rc1′″r1′″;
• Z1′″ is each independently at each occurrence a single bond, an oxygen atom, or a divalent organic group;
• Rb1′″ is each independently at each occurrence a hydroxyl group or a hydrolyzable group;
• Rc1′″ is each independently at each occurrence a hydrogen atom or a monovalent organic group;
• q1′″ is each independently at each occurrence an integer of 0 to 3;
• r1′″ is each independently at each occurrence an integer of 0 to 3;
• Rb1″ is each independently at each occurrence a hydroxyl group or a hydrolyzable group;
• Rc1″ is each independently at each occurrence a hydrogen atom or a monovalent organic group;
• p1″ is each independently at each occurrence an integer of 0 to 3;
• q1″ is each independently at each occurrence an integer of 0 to 3;
• r1″ is each independently at each occurrence an integer of 0 to 3;
• Rb1′ is each independently at each occurrence a hydroxyl group or a hydrolyzable group;
• Rc1′ is each independently at each occurrence a hydrogen atom or a monovalent organic group;
• p1′ is each independently at each occurrence an integer of 0 to 3;
• q1′ is each independently at each occurrence an integer of 0 to 3;
• r1′ is each independently at each occurrence an integer of 0 to 3;
• Rb1 is each independently at each occurrence a hydroxyl group or a hydrolyzable group;
• Rc1 is each independently at each occurrence a hydrogen atom or a monovalent organic group;
• p1 is each independently at each occurrence an integer of 0 to 3;
• q1 is each independently at each occurrence an integer of 0 to 3;
• r1 is each independently at each occurrence an integer of 0 to 3, and
• at least one Rb1, Rb1′, Rb1″, or Rb1′″ is present in each group represented by RSi.