High purity diphenyl sulfone, preparation and use thereof for the preparation of a poly(aryletherketone)
AssigneeSolvay Advanced Polymers, L.L.C.
InventorsChantal Louis, William Gandy, Edward Ryan, Geoffrey Scott Underwood, Kong Yi
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Abstract
The presence of certain impurities in diphenyl sulfone have a deleterious effect on the properties of the poly(aryletherketone)s produced therein, including one or more of color, melt stability, molecular weight, crystallinity, etc. and here identify those impurities and provide processes for the recovery of the diphenyl sulfone.
Claims11
A method for the preparation of a poly(aryletherketone) by aromatic nucleophilic substitution, wherein said aromatic nucleophilic substitution comprises reacting a substantially equimolar mixture of at least one bisphenol and at least one dihalobenzoid compound or at least one halophenol compound in a solvent comprising a diphenyl sulfone wherein said diphenyl sulfone has been used in the preparation of a poly(aryletherketone) (used DPS), and wherein said used DPS meets all of the following impurity limitations:
- Monomethyldiphenylsulfone content (sum of all
- Less than 0.2 area %
- isomers)
- Monochlorodiphenylsulfone content (sum of all
- Less than 0.08 area %
- isomers)
- Sodium content
- Less than 55 ppm
- Potassium content
- Less than 15 ppm
- Iron content
- Less than 5 ppm
- Residual acidity content
- Less than 2.0 μeq/g
- Diphenyl sulfide content
- Less than 2.0 wt. %
- APHA of 20 wt. % solution in acetone at 25° C.
- Less than 50
- Total chlorine content
- Less than 120 ppm
- wherein ppm and wt. % are based on the total weight of the used DPS and area % represents the ratio of the GC peak area of the impurity of concern over the total area of all GC peaks of the used DPS.
Dependencies are inferred from the claim text.