摘要:
This invention relates to a process for the preparation of high molecular weight polyarylene sulphides from low molecular weight polyarylene sulphides by a reaction with elementary sulphur.
摘要:
This invention relates to a process for the preparation of optionally branched polyarylene sulphides which are distinguished by their substantially lower corrosiveness.
摘要:
A process for removing onium salts from aqueous solutions comprising adding a phenolic compound to an onium salt containing aqueous solution, contacting the solution with a water-immiscible organic material whereby the onium salt migrates into the water-immiscible organic material and separating the aqueous hase from the onium salt in the water-immiscible organic material.