Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Treating polymer containing material or treating a solid...
Patent
1994-03-08
1996-08-06
Seidleck, James J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Treating polymer containing material or treating a solid...
528480, 528483, 528501, 528502C, 528503, 525419, 525420, C08G 6946, C08G 6948
Patent
active
055434959
ABSTRACT:
This invention concerns a process for increasing the molecular weight and viscosity of polyamides and other condensation polymers, by first injecting an inert gas into the polymer melt at elevated pressure, then stripping the volatiles from the polymer through the application of reduced pressure, followed by holding the polymer at elevated temperatures long enough for the reaction to occur. Activators may be added to the polymer. Port areas used in the stripping zone, may be kept hot for continuous operation.
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Anolick Colin
Cramer Gregory D.
Dujari Ramdas
Lee Win-Chung
Rao Sundar M.
E. I. Du Pont de Nemours and Company
Hampton-Hightower P.
Seidleck James J.
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