Fluoropolyether group-containing compound

A fluoropolyether group-containing compound of formula (1a) or formula (1b):

• wherein
• RF1 is each independently at each occurrence Rf1—RF—Oq—;
• RF2 is —Rf2p—RF—Oq—;
• Rf1 is each independently at each occurrence 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 divalent fluoropolyether group;
• p is 0 or 1;
• q is each independently at each occurrence 0 or 1;
• and
• R1 and R2, each independently at each occurrence, an alkyl group or an alkoxy group having 1 to 10 carbon atoms, or together form a group having a ring structure which is a 5 to 10-membered heterocyclic ring, or together form a group having a ring structure which is a condensed ring containing a 5 to 10-membered heterocyclic ring, wherein the alkyl group, the alkoxy group and the group having the ring structure may be substituted.