Fluoropolyether group containing compound

A fluoropolyether group-containing compound of formula (1) or (2) below:

• RF1—X—RSi (1)
• RSi—X—RF2—X—RSi (2)
• wherein
• RF1 is Rf1—RF—Oq—;
• RF2 is —Rf2p—RF—Oq—;
• Rf1 is a C1-16 alkyl group optionally substituted with one or more fluorine atoms;
• Rf2 is a C1-6 alkylene group optionally substituted with one or more fluorine atoms;
• RF is each independently at each occurrence a group represented by formula:
• —(OC6F12)a—(OC5F10)b—(OC4F8)c—(OC3RFa6)d—(OC2F4)e—(OCF2)f—
• a, b, c, d, e, and f are each independently an integer of 0 to 200, and the sum of a, b, c, d, e, and f is 1 or more, and the occurrence order of each repeating unit enclosed in parentheses provided with a, b, c, d, e, or f is not limited in the formula;
• RFa is each independently at each occurrence a hydrogen atom, a fluorine atom, or a chlorine atom;
• p is 0 or 1;
• q is independently 0 or 1;
• X is each independently at each occurrence a group represented by the following formula:
• —Rz1—O—Rz2—
• Rz1 is each independently at each occurrence a group represented by —(CH2)z1—;
• Rz2 is each independently at each occurrence —(CH2)z2-optionally substituted with a C1-6 alkyl group or a cyclic alkyl group optionally containing one or more nitrogen atoms, oxygen atoms, sulfur atoms, or silicon atoms, or with a perfluoroalkyl group;
• z1 is each independently at each occurrence an integer of 0 to 20;
• z2 is each independently at each occurrence an integer of 0 to 20;
• RSi is each independently at each occurrence a group represented by the following formula:
• —SiRa12Rb1 (S1)
• Ra1 is —Z1—SiR22q1R23r1;
• Z1 is each independently at each occurrence a C1-6 alkylene group, —(CH2)z11—O—(CH2)z12—, or —(CH2)z13-phenylene-(CH2)z14—;
• z11 is an integer of 0 to 6;
• z12 is an integer of 0 to 6;
• z13 is an integer of 0 to 6;
• z14 is an integer of 0 to 6;
• R22 is each independently at each occurrence a hydroxyl group or a hydrolyzable group;
• R23 is each independently at each occurrence a hydrogen atom or a monovalent organic group;
• q1 is each independently at each occurrence an integer of 1 to 3;
• r1 is each independently at each occurrence an integer of 0 to 2;
• and
• Rb1 is a C1-6 alkyl group.