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1. (WO2002004561) TREATMENT OF POLYAMIDE WITH GAS PHASE OR ACID, ANHYDRIDE OR AMINE

Pub. No.:    WO/2002/004561    International Application No.:    PCT/EP2001/006603
Publication Date: Jan 17, 2002 International Filing Date: Jun 12, 2001
IPC: C08G 69/46
C08G 69/48
D01F 6/60
D06M 13/188
D06M 13/203
D06M 13/325
D06M 13/332
D06M 23/06
Applicants: BASF CORPORATION
OTTO, M., Ilg
HU, Harry, Y.
BRANK, Scott, R.
Inventors: OTTO, M., Ilg
HU, Harry, Y.
BRANK, Scott, R.
Title: TREATMENT OF POLYAMIDE WITH GAS PHASE OR ACID, ANHYDRIDE OR AMINE
Abstract:
The end group content of polyamide in the solid state may be reduced b treating the polyamide with gas-phase acid, anhydride, or amine. Stain- or dye-resistant polyamide fibers can be made by reducing the number of amino end groups. Reduction in the number of carboxylic end groups reduces the rate of regeneration of starting monomers during extrusion.