Process for the oligomerization of hexafluoropropylene oxiyde (HFPO) in which the sum of the dimers, trimers, tetramers, pentamers and hexamers represents less than 20% of the weight of the polymerized HFPO, the oligomers other than the dimers, trimers, tetramers, pentamers and hexamers (the remaining oligomers) having an average molecular weight ranging between 1100 and 4000 g/mol, characterized in that the process comprises the steps of contacting hexafluoropropylene oxide (HFPO) at a temperature between −30° C. to +50° C. with a catalyst system selected from potassium fluoride and di-, tri- or tetraethyleneglycol-dimethylether in the presence of a solvent which is selected from perfluorinated aliphatic or aromatic hydrocarbon with more than 3 and less than 12C-atoms and optionally a polar group but not comprising chlorine or bromine partially fluorinated aliphatic or aromatic hydrocarbon with more than 3 and less than 12C-atoms and optionally a polar group but not comprising chlorine or bromine at a pressure of less than 3 bars by controlled monomer addition continuous feeding or by adding the monomer in one or two portions (shots).
BICOMPATIBLE LIQUID AND METHOD FOR SCREENING SAME
申请人:KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHO
公开号:US20160313303A1
公开(公告)日:2016-10-27
An object of the present invention is to provide a biocompatible liquid that is more essential and practical, and a method for screening the same.
The object is achieved by using, as the biocompatible liquid, a liquid having a Hansen solubility parameter (HSP) compatible to a cell to which the liquid is applied.
US8653229B2
申请人:——
公开号:US8653229B2
公开(公告)日:2014-02-18
[EN] POLYMERISATION OF HEXAFLUOROPROPYLENE OXIDE<br/>[FR] POLYMÉRISATION D'OXYDE D'HEXAFLUOROPROPYLÈNE
申请人:CLARIANT INT LTD
公开号:WO2009118348A2
公开(公告)日:2009-10-01
Process for the oligomerization of hexafluoropropylene oxide (HFPO) in which the sum of the dimers, trimers, tetramers, pentamers and hexamers represents less than 20% of the weight of the polymerized HFPO, the oligomers other than the dimers, trimers, tetramers, pentamers and hexamers (the remaining oligomers) having an average molecular weight ranging between 1100 and 4000 g/mol, characterized in that the process comprises the steps of contacting hexafluoropropylene oxide (HFPO) at a temperature between -30°C to + 50°C with a catalyst system selected from potassium fluoride and di-, tri- or tetraethyleneglycol-dimethylether in the presence of a solvent which is selected from perfluorinated aliphatic or aromatic hydrocarbon with more than 3 and less than 12 C-atoms and optionally a polar group but not comprising chlorine or bromine partially fluorinated aliphatic or aromatic hydrocarbon with more than 3 and less than 12 C-atoms and optionally a polar group but not comprising chlorine or bromine at a pressure of less than 3 bars by controlled monomer addition continuous feeding or by adding the monomer in one or two portions (shots).