Production of polycaproamide fiber wherein polycaproamide is rea

Details Production of polycaproamide fiber wherein polycaproamide is rea Production of polycaproamide fiber wherein polycaproamide is rea

1976-10-27

1978-02-21

Anderson, Harold D.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

260 78L, 260 78SC, C08G 6946, D02J 122

Patent

active

040752712

ABSTRACT:
It has been suggested that a high strength polycaproamide fiber having excess number of carboxyl end groups over amino end groups can be produced by melt spinning a polymer prepared by polymerizing e-caprolactam and reacting the polymer with a dibasic carboxylic acid containing at least six carbon atoms. However, with incorporation of this dicarboxylic acid reactant in continuous operation, serious problems have been encountered in melt-spinning of the polymer due to the frequent occurrence of "nubs" or enlarged places in the extruded polyamide filament. It has now been found that the occurrence of said nubs in the fiber can be greatly reduced by utilizing certain cyclic tetracarboxylic acid dianhydrides and reacting the dianhydride at the end of the polymerization. Moreover, dyeing properties of the fiber may be more readily controlled.

REFERENCES:
patent: 3839530 (1974-10-01), Bingham et al.
patent: 3890286 (1975-06-01), Bingham et al.

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