The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 21, 2014
Filed:
May. 06, 2010
Graziano Giuseppe Vezzulli, Milan, IT;
Piero Gavezotti, Milan, IT;
Fabrizio Mutta, Fino Mornasco, IT;
Claudio Adolfo Pietro Tonelli, Sesto San Giovanni, IT;
Graziano Giuseppe Vezzulli, Milan, IT;
Piero Gavezotti, Milan, IT;
Fabrizio Mutta, Fino Mornasco, IT;
Claudio Adolfo Pietro Tonelli, Sesto San Giovanni, IT;
Solvay Specialty Polymers Italy S.p.A., Bollate (Milano), IT;
Abstract
A process for purifying a polyol (per)fluoropolyether derivative [polyol (P)] from a mixture of hydroxyl (per)fluoropolyether derivatives [mixture (M)]. Such polyol (P) comprising one or more hydroxyl (per)fluoropolyether derivatives [PFPE (OH)] comprising at least one (per)fluoropolyoxyalkylene chain (chain R) and at least one end-group having formula (t) —CFCHOCHCH(OH)CHOCHCH(OH)CHOH. Such mixture (M) comprising the polyol (P) and at least one PFPE (OH) different from the polyol (P) and comprising at least one chain Rand at least one end-group selected from end-groups having formula (t) —CFCHOH and formula (t) —CFCHOCHCH(OH)CHOH. The process comprises the steps of: 1) reacting the mixture (M) with a ketone, an aldehyde or a combination thereof to yield corresponding mixture of cyclic ketal/acetal (per)fluoropolyether derivatives [PFPEs (OH)] [protected mixture (P)]; 2) carrying out a molecular distillation of the protected mixture (P) to isolate a protected product heavy residue [product (P)]; 3) hydrolyzing the product (P) to yield deprotected product [product (P)]; and 4) carrying out a distillation under reduced pressure of the product (P) to obtain polyol (P).