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.

公开(公告)号：DE2447368A1

公开(公告)日：1976-04-08

申请号：DE2447368

申请日：1974-10-04

Applicant: BASF AG

Inventor： HAMMELMANN HERBERT ,  FALKENSTEIN GEORG DIPL CHEM DR ,  DOERFEL HELMUT DIPL CHEM DR ,  ZETTLER HANS DIETER ,  KRIEGER HEINRICH ING GRAD ,  DENNI RAYMOND DIPL CHEM DR ,  EGER KNUT DIPL ING DR

IPC: B01J19/20 ,  C08G18/08

Abstract: Thermoplastic polyurethane elastomers, esp. linear organosoluble, polyurethane elastomers are prepd. continuously by reacting polyhydroxy cpds., diisocyanates, and low mol. wt. chain extenders in a multi-screw extruder. The components are introduced directly and separately in measured amts. into the inlet zone of the extruder, and a temp. profile is maintained in the extruder, this ranging from 240 degrees C in the inlet zone to 190 degrees C at the extrusion die. Economic prodn. of prods. having a very uniform quality is possible. These can be easily obtd. in the form of granules, profiles, tubes and cable sheaths. The prod. is soluble in org. solvents, and the solns. are suitable for coating purposes. The granules can be processed by most methods used for thermoplasts, e.g. extrusion, injection moulding and calendering.