公开(公告)号：US3838107A

公开(公告)日：1974-09-24

申请号：US39823573

申请日：1973-09-17

Applicant: RHONE PROGIL

Inventor： LEMAISTRE R ,  JUHASZ F

IPC: C08L67/00 ,  C08G63/00 ,  C08G63/52 ,  C08G63/88 ,  C08L67/06 ,  C08G17/10

CPC classification number: C08G63/88 ,  C08L67/06 ,  C08L67/02

Abstract: THE PREPARATION OF CRYSTALLIZED POLYESTER OF POLYETHYLENE GLYCOL FURMARATE, SUCCINATE AND/OR ADIPATE, IN WHICH THE RATIO OF ADIPIC ACID AND SICCINIC ACID TO FUMARIC ACID IS WITHIN THE RANGE OF 0 TO 25:75 IN WHICH THE POLYESTER HAS A MOLECULAR WEIGHT WITHIN THE RANGE OF 1000 TO 2000, COMPRISING ADDING A SUBSTANCE CAPABLE OF INITIATING CRYSTALLIZATION OF THE POLYESTER AT A TEMPERATURE WITHIN THE RANGE OF 120* TO 180*C.IN A FIRST STEP, HOLDING THE POLYESTER AT A TEMPERATURE NOT LESS THAN 100*C. BUT BELOW THE TEMPERATURE OF THE POLYESTER IN THE FIRST STEP WHILE IN THE PRESENCE OF POLYESTER MICRO-CRYSTALS HAVING A COMPOSITION ANALOGUS TO THAT OF THE POLYESTER TO THE CRYSTALLIZED, AND HOLDING THE POLYESTER IN A LAYER HAVING A THICKNESS WITIN THE RANGE OF 5 TO 20 MM. FOR FROM 12 TO 60 MINUTES AT A TEMPERATURE WITHIN THE RANGE OF 50* TO 70* C.