Photobleach system, composition and process

Details Photobleach system, composition and process Photobleach system, composition and process

1983-02-17

1985-06-18

Nucker, Christine M.

Compositions

Reductive bleachant, deoxidant, reductant, or generative

2521882, 25218821, 252105, 252107, H07J 718, C11D 754

Patent

active

045240140

ABSTRACT:
A photobleach system is disclosed comprising a synergistic mixture of an electron donor and a visible/ultraviolet radiation absorbing compound (a chromophore acceptor) which is capable of, in an excited electronic state, undergoing electron transfer from said electron donor. A composition comprising said photobleach system and use of the system or composition in bleaching dyes and textiles are also disclosed. A preferred electron donor is sodium sulphite. Preferred chromophore acceptors are water-soluble metallated phthalocyanines and naphtalocyanines.

REFERENCES:
patent: 3927967 (1975-12-01), Speakman
patent: 4033718 (1977-07-01), Holcombe et al.
patent: 4077768 (1978-03-01), Johnston et al.
patent: 4094806 (1978-06-01), Wiers
patent: 4166718 (1979-09-01), Reinert et al.
patent: 4217105 (1980-08-01), Goodman
patent: 4240920 (1980-12-01), de Luque
patent: 4318883 (1982-03-01), Polony et al.
patent: 4400173 (1983-08-01), Beavan

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