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US 12,247,102 B2Granted
Process for the preparation of polyamides
AssigneeInv Nylon Polymers Americas, LLC
InventorBryan D. Kaushiva
Life of this patent
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Abstract
The present disclosure relates to a method for the production of polyamides having the benefit of simpler process control, lower thermal degradation and greater compositional flexibility. More particularly, it relates to processes of converting salts of diamines and dicarboxylic acids to polyamides in the solid state without a melt phase, by fluidizing solid diacid in a fluidizing gas.
Claims13
A process for making at least one of a polyamide or a polyamide salt comprising:
- feeding a finely divided solid diacid comprising adipic acid at a temperature below 100° C. to a cascade reactor unit comprising a reaction zone that comprises a plurality of vertically-stacked fluidized bed sections;
- fluidizing the finely divided solid diacid in a fluidizing gas;
- and
- reacting the finely divided solid diacid with diamine comprising hexamethylenediamine in the reaction zone to form at least one of the polyamide comprising nylon-6,6 or the polyamide salt comprising a nylon-6,6 salt.
1 more element
Dependencies are inferred from the claim text.