Process for recovering dyestuff from dyestuff-containing informa

Details Process for recovering dyestuff from dyestuff-containing informa Process for recovering dyestuff from dyestuff-containing informa

1998-09-24

2000-02-01

Liott, Caroline D.

Bleaching and dyeing; fluid treatment and chemical modification

Dye recovery process, other than nominal recovery

510201, C09B 6754

Patent

active

060197986

ABSTRACT:
The present invention provides a process for efficient recovery of dyestuffs from dye-based optical disks, and to provide a solvent used for recovery. Disclosed herein is a process for recovering dyestuffs from dye-based optical disks by treating the dyestuff-containing layer with a solvent containing a singlet oxygen quencher. Disclosed also herein is a solvent for dyestuff recovery which contains a singlet oxygen quencher.

REFERENCES:
patent: 4735889 (1988-04-01), Namba et al.
patent: 5779909 (1998-07-01), Tomita et al.
patent: 5817183 (1998-10-01), Eddy-Helenek et al.
CAPLUS Abstract of Mischke's article entitled "Manufacturing of CD-R Media," Proc. SPEI-Int. Soc. Opt. Eng. 2931, 43-51, Apr. 1996.
English language translation of JP 7-49,532, Mitsui Toatsu Chemicals, pp. 1-16, Dec. 1992.
English language translation of JP 10-249,103, Sony Corporation, pp. 1-22, Sep. 1998.
Mischke et al, "Manufacturing CD-R Media," Proc. SPIE-Int. Soc. Opt. Eng. (2931), pp. 43-51, Apr. 1996.

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