Method for ring-dyeing nylon filaments with indigotine dye for t

Details Method for ring-dyeing nylon filaments with indigotine dye for t Method for ring-dyeing nylon filaments with indigotine dye for t

1992-12-22

1993-12-07

Clingman, A. Lionel

Bleaching and dyeing; fluid treatment and chemical modification

Process involving plural application steps with same dye

8502, 8650, 8653, 8924, 151671, 152072, 428378, C09B 700, D06P 500, A46B 904

Patent

active

052680053

ABSTRACT:
A method for dyeing nylon filaments for use in wear-indicating toothbrushes includes immersing a batch of a first nylon filament for between 10 minutes and 80 minutes in an aqueous solution containing between 0.01% and 0.19% weight to volume of Indigotine dye, said solution having a pH between 1 and 7 and having a temperature between 50.degree. C. and 90.degree. C., the dye penetrating into the filament to color an outer cross-sectional region and not penetrating into an inner cross-sectional region of the filament; removing the batch of the first nylon filament from the solution, and repeating the steps for a batch of a second nylon filament, reusing the same solution.

REFERENCES:
patent: 2558992 (1951-07-01), Stott
patent: 3258805 (1966-07-01), Rossnan
patent: 4802255 (1989-02-01), Breuer et al.

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