Composition and process for stripping color from synthetic polym

Details Composition and process for stripping color from synthetic polym Composition and process for stripping color from synthetic polym

1986-11-03

1988-11-08

Lieberman, Paul

Bleaching and dyeing; fluid treatment and chemical modification

Bleaching

Color stripping or subduing

81081, D06L 300

Patent

active

047831936

ABSTRACT:
The present invention provides a process that utilizes synergistic chemical systems for decolorizing synthetic polymer materials, such as polyester, in a variety of shapes including fibers, yarns, fabrics, sheets and films. These chemical systems are unstable dispersions of alkyl halides and aqueous solutions of bleaching/oxidizing agents, such as the alkali metal salts of hypohalites, to which specified quantities of organic or inorganic acids and of surfactant/wetting agents are added. The polymeric materials are exposed to the activated chemical systems in appropriate reaction vessels. The stripping process is rapid and the resulting products are completely color-free. Further, the alkyl halide and bleaching/oxidizing components of the chemical systems can be reclaimed after the decolorizing process for recycling.

REFERENCES:
patent: 1547187 (1925-07-01), Weis
patent: 3908680 (1975-09-01), Krezanoski
patent: 4013575 (1977-03-01), Castrantas
patent: 4116851 (1978-09-01), Rupe et al.

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