Title:
【発明の名称】ジカルボン酸とジアミンを基材とするポリアミドの製造方法
Document Type and Number:
Japanese Patent JPH11503778
Kind Code:
A
Abstract:
A polymer based on a dicarboxylic acid and a diamine is prepared by polycondensation in an extruder, by(a) heating a mixture of a dicarboxylic acid having from 4 to 12 carbon atoms and a diamine having from 4 to 12 carbon atoms, which mixture is solid at room temperature and has a residual moisture content of less than 5% by weight, to a temperature in the range from 150 to 400° C. under autogenous pressure in a contrarotating twin-screw extruder to give a product A,(b) feeding the product A to a corotating twin-screw extruder, with the product A being exposed to a temperature in the range from 150 to 400° C. and residual water present and also water from the polycondensation being removed through the degassing openings, to give a product B, with the proviso that the corotating twin-screw extruder has at least two segments having different pressures.
Inventors:
Getz, walter
Hoffmann, Jürgen
Copyz, michael
Holle, Helmut
Hoffmann, Jürgen
Copyz, michael
Holle, Helmut
Application Number:
JP53144096A
Publication Date:
March 30, 1999
Filing Date:
March 28, 1996
Export Citation:
Assignee:
BASF Akchen Gezel Shaft
International Classes:
C08G69/04; C08G69/26; C08G69/28; C08G73/10; G03F7/038; G11B5/48; G11B21/00; H05K1/05; G03F7/004; (IPC1-7): C08G69/26
Attorney, Agent or Firm:
Tajiro Taiji (1 person outside)