Method for producing polysiloxane-polycarbonate block copolymers using at least one special condensation reactor

• Main Authors: VAN DORST PAUL, VANDEN EYNDE, JOHAN, DE WOLF MARCO, SPENCE MATTHEW, KALLENBERG, GERHARD, BARTZ MANFRED, MEIER ANDREAS, R.ENBERGER, LIESENFELD ULRICH
• Format: Patent
• Language: Chinese; English
• Published: 22.03.2024
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP

The invention relates to a multi-stage process for the continuous production of polysiloxane-polycarbonate block copolymers by polycondensation, said process being characterized in that in a first stage, a low polycarbonate and a hydroxyaryl-terminated polysiloxane are provided, and in a second stage, at least one special condensation reactor is used, preferably, exactly one special condensation reactor or exactly two special condensation reactors arranged in series are used in the second stage. The process is further characterized in that a specific amount of a specific promoter is added and such promoter is added upstream of the first special condensation reactor. The polysiloxane-polycarbonate block copolymers produced by the method according to the invention have a high proportion of small polysiloxane domains and are characterized by good mechanical properties, in particular ductile fracture behavior in notch impact tests according to ISO 7391/ISO 180A, good processability, for example in injection moldi