Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1984-06-15
1985-09-10
Anderson, Harold D.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
526 68, 526 71, C08G 6928
Patent
active
045407720
ABSTRACT:
Nylons are prepared by a continuous process in which, in a precondensation 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.degree.-300.degree. C. under superatmospheric pressure, with simultaneous vaporization of water and formation of a prepolymer, the prepolymer and the vapor are separated, and the former is fed into a polycondensation zone and condensed under superatmospheric pressure of from 1 to 10 bar and at from 250.degree. to 300.degree. C., wherein the aqueous salt solution is condensed under superatomspheric pressure of from 1 to 10 bar in the first third of the tubular precondensation zone provided with baffles, until the degree of conversion is not less than 93%, and the prepolymer and the vapor phase are brought into intimate contact with one another in the remaining two thirds of the precondensation zone.
REFERENCES:
patent: 3269990 (1966-08-01), Wiloth et al.
patent: 3296217 (1967-01-01), Tate
patent: 3900450 (1975-08-01), Jaswal et al.
patent: 3948862 (1976-04-01), Iwasyk
patent: 4019866 (1977-04-01), Jaswal et al.
Fischer Hermann
Heil Eduard
Matthies Paul
Pipper Gunter
Riegger Siegfried
Anderson Harold D.
BASF - Aktiengesellschaft
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