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:
Mar. 04, 2014
Filed:
May. 06, 2010
Claudio Adolfo Pietro Tonelli, Sesto San Giovanni, IT;
Graziano Giuseppe Vezzulli, Milan, IT;
Rosaldo Picozzi, Cesate, IT;
Piero Gavezotti, Milan, IT;
Claudio Adolfo Pietro Tonelli, Sesto San Giovanni, IT;
Graziano Giuseppe Vezzulli, Milan, IT;
Rosaldo Picozzi, Cesate, IT;
Piero Gavezotti, Milan, IT;
Solvay Solexis S.P.A., Bollate, IT;
Abstract
A process for purifying a polyol(per)fluoropolyether derivative [polyol (P)] from a mixture (M) of hydroxyl(per)fluoropolyether derivatives, such polyol (P) comprising one or more hydroxyl(per)fluoropolyether derivatives [PFPEs (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 said polyol (P) and at least one hydroxyl(per)fluoropolyether derivative [PFPE (OH)] different from 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 following steps: 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): submitting the protected mixture (P) to adsorption on silica gel to yield an adsorbed protected product [adsorbed product (P)] and then recovering a desorbed protected product [desorbed product (P)] by subsequent desorption from silica gel of the adsorbed product (P); 3) distilling the desorbed product (P) under reduced pressure to isolate a protected product residue [product (P)]; and 4) hydrolyzing the product (P) to obtain polyol (P).