Control of viscosity and polycaproamide degradation during vacuu

Details Control of viscosity and polycaproamide degradation during vacuu Control of viscosity and polycaproamide degradation during vacuu

1974-06-19

1976-08-24

Schain, Howard E.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 78A, C08G 6916

Patent

active

RE0289370

ABSTRACT:
Control of polycaproamide degradation during vacuum polycondensation in a polymer finisher is achieved by maintaining a partial pressure of water above the polymer melt above about 10 mm. Hg, preferably above about 30 mm. Hg, absolute pressure. Degradation is minimized to within 3, preferably 2 units of the theoretical difference between carboxyl and amine ends. The water extractables content of the polymer is also controlled to below about 3.5% by weight, preferably 2.5%; viscosity increase of the polymer melt levels out after less than 4 hours to less than 10 FAV units per hour, by means of the invention.

REFERENCES:
patent: 2731081 (1956-01-01), Mayner
patent: 2867805 (1959-01-01), Ludewig
patent: 2904109 (1959-09-01), Malm
patent: 3090773 (1963-03-01), Papero et al.
patent: 3386967 (1968-06-01), Twilley
patent: 3449220 (1969-06-01), Geisler
patent: 3558567 (1971-01-01), Twilley et al.
patent: 3679635 (1972-07-01), Portus

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