Document Type and Number:
Japanese Patent JPH0460138
Kind Code:
B2
Abstract:
Nylons are prepared by a continuous process in which, in an evaporator zone, an aqueous solution of a salt of a dicarboxylic acid of 6 to 18 carbon atoms and a diamine of 6 to 18 carbon atoms is heated to 250 DEG -300 DEG C. under superatmospheric pressure, with simultaneous vaporization of water and formation of a prepolymer, the prepolymer and the vapors are separated continuously, the vapors are rectified and the entrained diamines are recycled, and the prepolymer is fed to a polycondensation zone and subjected to polycondensation under superatmospheric pressure of from 1 to 10 bar and at from 250 DEG to 300 DEG C., wherein the aqueous salt solution is heated under superatmospheric pressure of from 1 to 10 bar during a residence time of less than 60 seconds, with the proviso that, on leaving the evaporator zone, the degree of conversion is not less than 93% and the water content of the prepolymer is not more than 7% by weight.
Inventors:
FURANTSU SHUMITSUTO
GUNTAA PITSUPAA
YOOZEFU GEORUKU FUROSU
FURANTSU TSUAARADONITSUKU
GUNTAA PITSUPAA
YOOZEFU GEORUKU FUROSU
FURANTSU TSUAARADONITSUKU
Application Number:
JP11924184A
Publication Date:
September 25, 1992
Filing Date:
June 12, 1984
Export Citation:
Assignee:
BASF AG
International Classes:
C08G69/26; C08G69/00; C08G69/28; C08L77/00
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