C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
402/222
C08G 73/14 (2006.01)
Patent
CA 1315463
ABSTRACT OF THE DISCLOSURE High molecular weight polyamide-imides having a reduced viscosity of 0.3 dl/g or above and exhibiting excellent heat resistance and melt flowability is produced with good economic efficiency by a process, which process comprises the two reaction stages: (a) a first reaction stage which comprises reacting (I) a trimellitic acid derivative and (II) an aromatic diamine in the presence of a polar solvent in the presence of a first dehydration catalyst until a polyamide-imide resin having a reduced viscosity of 0.2 to 0.5 dl/g as measured at a concentration of 0.5 g/dl in dimethylformamide at 30°C is produced; and (b) a second reaction stage which comprises adding a phosphorous ester as a second dehydration catalyst to the reaction mixture resulting from the first reaction stage and further reacting the reaction mixture until a high molecular weight polyamide-imide resin having a reduced viscosity of 0.3 dl/g or above as measured at a concentration of 0.5 g/dl in dimethylformamide at 30 °C is produced.
590859
Hattori Kenji
Mukoyama Yoshiyuki
Sakata Toichi
Hattori Kenji
Hitachi Chemical Company Ltd.
Kirby Eades Gale Baker
Mukoyama Yoshiyuki
Sakata Toichi
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