Abstract:
A method of manufacturing cyclophosphazenes PFPE derivatives to be used in the lubrication of magnetic recording media is herein provided. The method comprises: a) a (per)fluoropolyether (PFPE) polyol [PFPE (P pol )] comprising a fluoropolyoxyalkylene chain (R f ) having two chain ends, each chain end comprising at least one hydroxy group, and b) the corresponding alkoxide of perfluoropolyether (P pol ) [PFPE (P alk )] wherein the equivalent concentration of PFPE (P alk ) in PFPE (P pol ) is lower than 30%, preferably ranging from 5% to 15%; 2) contacting mixture (M) with a perhalocyclophosphazene (CP halo ) to provide a mixture (M1) containing an equivalent ratio of PFPE (P alk )/(CP halo ) of at least 1; 3) allowing mixture (M1) to react until complete disappearance of P-Cl groups to provide a mixture (M2); 4) submitting mixture (M2) to hydrolysis to provide a mixture (M3); 5) optionally removing (P pol ) from mixture (M3) to provide a mixture (M4). A method of purifying mixture (M4) is also herein provided.
Abstract:
The present patent application relates to block copolymers comprising (per)fluoropolyether chains useful as lubricants and characterized by increased viscosity.
Abstract:
The present invention relates to novel derivatives of (poly)alkoxylated (per)fluoropolyethers, also referred to as PFPE-PAGs, comprising unsaturated end groups bearing acrylate, allylic or vinylic moieties.
Abstract:
A lubrication method comprising applying to a surface to be lubricated a polymer comprising a partially or fully fluorinated, straight or branched, polyoxyalkylene chain (chain R f ) having two chain ends, wherein one or both chain end(s) bear(s) a hydroxy- or alkoxy-terminated polyoxyalkylene chain free from fluorine atoms (chain R a ), said chain comprising from 4 to 50 fluorine-free oxyalkylene units, said units being the same or different from one another and being selected from -CH 2 CH 2 O- and -CH 2 CH(J)O-, wherein J is independently straight or branched alkyl or aryl, with the proviso that, if both chain ends bear a hydroxy-terminated chain Ra comprising only -CH 2 CH 2 O- units, chain Rf does not consist only of -CF 2 CF 2 O-units. Lubricant compositions containing the polymer and methods for preparing the polymer are also herein disclosed.
Abstract:
The present patent application relates to block copolymers comprising (per)fluoropolyether chains useful as lubricants and characterized by increased viscosity.
Abstract:
The present invention relates to copolymers comprising recurring units derived from (per) fluoropolyether polymers, and to their use in coatings, surface treatments and as additives in polymer composites and coating compositions
Abstract:
The invention relates to a batch chromatography process the purification of (per)fluoropolyether (PFPE) carboxylates, in particular to a process for increasing the average functionality of PFPE carboxylates mixtures.
Abstract:
The present invention relates to novel hydroxy-ternninated (per)fluoropolyether polymer derivatives comprising urethane moieties and their use as additive in compositions for coating substrates, notably glass, metal and plastic.