PROCESS FOR THE PREPARATION OF COPOLY(ARYLENE SULFIDE) HAVING AN INCREASED AMOUNT OF DISULFIDE RADICALS

摘要

2071516 9109072 PCTABS00005 A process for preparation of a copoly(arylene sulfide) which has an increased amount of disulfide radicals and corresponds to the structure ¢(-A-S-)1-x(-A-S-S-)x!n, wherein A is a divalent substituted or unsubstituted aromatic radical, x is in the range of 0.50 to 0.005 and n is at least 50, comprising contacting a disulfide radical increasable copoly(arylene sulfide) corresponding to the structure ¢(-A-S-)1-x(-A-S-S-)x!n, wherein A is a divalent substituted or unsubstituted aromatic radical, x is in the range of 0.45 to 0.001 and n is at least 25, in the melt phase with elemental sulfur for a sufficient period of time and at a temperature above 250 degrees C to increase the molecular weight of the copoly(arylene sulfide).