EP 1833874 A1 20070919 - METHOD AND DEVICE FOR PRODUCING POLYESTER GRANULES AND/OR SHAPED PARTS WITH A LOW ACETALDEHYDE CONTENT
Title (en)
METHOD AND DEVICE FOR PRODUCING POLYESTER GRANULES AND/OR SHAPED PARTS WITH A LOW ACETALDEHYDE CONTENT
Title (de)
VERFAHREN UND VORRICHTUNG ZUR HERSTELLUNG VON POLYESTER-GRANULAT UND/ODER -FORMTEILEN MIT NIEDRIGEM ACETALDEHYD-GEHALT
Title (fr)
PROCEDE ET DISPOSITIF POUR PRODUIRE UN GRANULAT ET/ OU DES PIECES MOULEES EN POLYESTER A FAIBLE TENEUR EN ACETALDEHYDE
Publication
Application
Priority
- CH 2005000723 W 20051206
- CH 20262004 A 20041207
Abstract (en)
[origin: WO2006060930A1] The invention relates to a method for producing polyester granules and/or shaped parts from a melt resulting from a polycondensation (1). The invention provides that, in order to obtain a low acetaldehyde content, the melt, in the discharge area (2) of the polycondensation and at a temperature between 270 and 285 °C, is kept in contact with a gas space under reduced pressure. With regard to the granules, a standard crystallization (5) and drying (6) with air serving as drying gas are sufficient within the scope of the inventive method. The shaped parts can be produced directly from the melt by using, for example, an injection molding machine (9). The inventive device carries out a polycondensation whose at least final stage is provided in the form of a disc reactor inside of which, while avoiding a formation of sediments to the greatest possible extent, the melt is directly conveyed from disc to disc by a combination of rotating discs and by static scrapers mounted on the periphery of the reactor. In the discharge area, the melt is conveyed by static scrapers directly into the discharge unit without the melt accumulating in this location.
IPC 8 full level
C08G 63/80 (2006.01)
CPC (source: EP KR US)
B01J 19/20 (2013.01 - EP US); C08G 63/78 (2013.01 - KR); C08G 63/785 (2013.01 - EP US); C08G 63/80 (2013.01 - KR); B01J 2208/0084 (2013.01 - EP US); B01J 2219/00768 (2013.01 - EP US); B01J 2219/00777 (2013.01 - EP US); B01J 2219/00779 (2013.01 - EP US); B01J 2219/182 (2013.01 - EP US)
Citation (search report)
See references of WO 2006060930A1
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
WO 2006060930 A1 20060615; CN 101072810 A 20071114; CN 101072810 B 20120516; EP 1833874 A1 20070919; KR 101250302 B1 20130403; KR 20080028835 A 20080401; RU 2007120623 A 20090120; RU 2412955 C2 20110227; US 2009302489 A1 20091210; US 8470220 B2 20130625
DOCDB simple family (application)
CH 2005000723 W 20051206; CN 200580042129 A 20051206; EP 05809991 A 20051206; KR 20077015405 A 20051206; RU 2007120623 A 20051206; US 72100305 A 20051206