公开(公告)号：DE2610980A1

公开(公告)日：1977-09-22

申请号：DE2610980

申请日：1976-03-16

Applicant: BASF AG

Inventor： DENNI RAIMOND DR ,  FLOHR JOACHIM DIPL ING ,  ZETTLER HANS DIETER DIPL ING ,  EGER KNUT DIPL ING DR ,  KRIEGER HEINRICH ING GRAD

IPC: B01J19/20 ,  C08G18/08

Abstract: Thermoplastic polyurethane elastomers are produced continuously by reacting organic polyhydroxy cpds., diisocyanates and low m. wt. chain lengthening agents in a multi screw extruder, the temp. of the reaction mixt. between the time of its formation and its leaving the extruder reducing from 180-250 degrees C to 165-200 degrees C. The reaction mixt. is always in the molten state, thus obviating any deposition of solid mixt. in the extruder. The mixt. has higher viscosity, thus facilitating the prodn. of a more easily mouldable extrudate. The resulting polyurethane elastomers are completely sol. and free from specks. The process is suitable for the "One Shot" or prepolymer type procedure.