Patent ID: 8513471

Claim:
A process for the manufacture of a polyol (per)fluoropolyether derivative [polyol PFPE (PFPE-OH)], said process comprising: 1 reacting at least one triol having two protected hydroxyl functions and a free hydroxyl group [protected triol (PT)] with an activating agent, to yield an activated protected triol [activated protected triol (APT)]; 2 reacting said activated protected triol with a functional (per)fluoropolyether derivative of formula: T 2 -O—R f -T 1 [functional PFPE (E)], wherein: R f represents a fluoropolyoxyalkene chain (chain R f ), said chain R f being a fluorocarbon segment comprising ether linkages in main chain; T 1 and T 2 , equal to or different from each other, are independently selected from the group consisting of non-functional groups of formula: —CF 3 , —CF 2 —CF 3 , —CF 2 Cl, —CF 2 CF 2 Cl, —CF 2 —COF, —COF: and functional hydroxyl groups comprising at least one hydroxyl group, with the provisio that at least one of T 1 and T 2 is a functional hydroxyl group as above detailed; to yield a protected polyol (per)fluoropolyether derivative [protected polyol PFPE (p-PFPE-OH)]; and 3 deprotecting said protected polyol PFPE (p-PFPE-OH) to yield the polyol PFPE (PFPE-OH).