Patent ID: 8664353
Filing Date: 2014-03-04
Classification: C08G

Abstract:
1. A process for the purification of a polyol (per)fluoropolyether derivative [polyol (P)] from a mixture of hydroxyl(per)fluoropolyether derivatives [mixture (M)], said polyol (P) comprising one or more hydroxyl(per)fluoropolyether derivatives [PFPEs (OH)] comprising at least one (per)fluoropolyoxyalkylene chain (chain R said mixture (M) comprising said polyol (P) and at least one hydroxyl(per)fluoropolyether derivative [PFPE (OH)], said PFPE (OH) being different from said polyol (P) and comprising at least one (per)fluoropolyoxyalkylene chain (chain R end-groups having formula (t said process comprising the following steps: step 1: reacting said mixture (M) with a ketone, an aldehyde, or a combination thereof so as to yield a corresponding mixture of cyclic ketal/acetal (per)fluoropolyether derivatives [PFPEs (OH) step 2: submitting said protected mixture (P) to adsorption on a silica gel so as to yield an adsorbed protected product [adsorbed product (P step 3: distilling said desorbed product (P step 4: hydrolyzing said product (P