Manufacture of polylactams with initial pressures above vapor pr

Details Manufacture of polylactams with initial pressures above vapor pr Manufacture of polylactams with initial pressures above vapor pr

1975-09-02

1977-09-20

Anderson, Harold D.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 78A, 526 65, C08G 6916

Patent

active

040496384

ABSTRACT:
A process for continuous production of polyamides by continuous transport of a mixture of one or more lactams and from 1 to 15% and preferably from 3 to 8% of water and optionally other polyamide-forming compounds such as the salts of dicarboxylic acids and diamines or aminocarboxylic acids through a number of reaction zones under polyamide-forming conditions, said mixture of starting materials being heated in a first reaction zone to temperatures of from 210.degree. to 330.degree. C and preferably from 220.degree. to 280.degree. C, whereupon the polycondensation mixture is adiabatically vented in a further reaction zone and is then polymerized to completion in yet another reaction state to form high molecular weight polyamides. The process is characterized in that

REFERENCES:
patent: 3171829 (1965-03-01), Wiesner et al.
patent: 3317482 (1967-05-01), Kunde et al.
patent: 3458482 (1969-07-01), Goto et al.
patent: 3558567 (1971-01-01), Twilley et al.
patent: 3565866 (1971-02-01), Guenther et al.

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