Patent application number | Description | Published |
20090275725 | POLYSULPHONES AND POLYETHER SULPHONES WITH REDUCED YELLOW INDEX AND PROCESSES FOR THEIR PREPARATION - The present invention relates to a process for the preparation of polysulfones having a yellowness index according to DIN 6167 of less than 19 and polyether sulfones having a yellowness index according to DIN 6167 of less than 30, wherein the polymerization is carried out in basic, aprotic solvents with the use of a positively conveying stirrer passing close to the wall. The present invention also relates to the polyether sulfones and polysulfones obtainable for the first time by this process and to the use of such polymers for the production of moldings, films, membranes and foams. | 11-05-2009 |
20100184898 | MOLDING COMPOSITIONS COMPRISING POLYARYL ETHER WITH IMPROVED SURFACE QUALITY - A thermoplastic molding composition, comprising:
| 07-22-2010 |
20110224386 | REACTIVE POLYARYLENE ETHER AND METHOD FOR THE MANUFACTURE THEREOF - The present invention relates to a process for the preparation of a polymer composition comprising
| 09-15-2011 |
20120029106 | METHOD FOR PRODUCING LOW-CHLORINE POLYBIPHENYL SULFONE POLYMERS - The present invention relates to a process for the production of low-chlorine-content polybiphenyl sulfone polymers, to the polybiphenyl sulfone polymers obtainable in this way, to polybiphenyl sulfone polymers with less than 800 ppm content of organically bonded chlorine, to thermoplastic molding compositions and moldings, fibers, films, membranes, or foams comprising the polybiphenyl sulfone polymers mentioned, and also to their use for the production of moldings, of fibers, of films, of membranes, or of foams. | 02-02-2012 |
20120149796 | METHOD FOR PRODUCING LOW-HALOGEN POLYBIPHENYLSULFONE POLYMERS - The present invention relates to a process for the production of low-halogen-content polybiphenyl sulfone polymers, to the resultant polybiphenyl sulfone polymers, to polybiphenyl sulfone polymers having less than 400 ppm content of polymer-bonded halogen, to thermoplastic molding compositions comprising these polybiphenyl sulfone polymers, and to their use for the production of moldings, of fibers, of films, of membranes, or of foams. | 06-14-2012 |
20140183030 | PROCESS FOR THE PURIFICATION OF A CRUDE SOLVENT STREAM COMPRISING AN N-ALKYLPYRROLIDONE - N-alkylpyrrolidone and, as contaminant alongside this, the corresponding N-alkyl-succinimide, to give a pure solvent stream which meets the requirements for use in a process for the production of polymers, where compounds of higher and lower boiling point than the N-alkylpyrrolidone are removed by distillation, which comprises, prior to, during, or after the distillative purification process, adding a hydroxide of an alkali metal or of an alkaline earth metal in a molar amount corresponding to a molar ratio of at least 0.1:1 for this hydroxide with respect to the respective N-alkylsuccinimide in the appropriate solvent stream present prior to, during, or after the distillative purification process. | 07-03-2014 |
20140183031 | Process for the Treatment of a Recycling Stream from a Plant for the Production of Polyarylene Ether Sulfones - A process is proposed for the treatment of a recycling stream ( | 07-03-2014 |
20140187737 | Process for the Treatment of a Recycling Stream from a Plant for the Production of Polyarylene Ether Sulfones - A process is proposed for the treatment of a recycling stream ( | 07-03-2014 |