Bleaching bath
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United States of America Patent
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Aug 24, 1993
Issued Date -
N/A
app pub date -
Nov 27, 1991
filing date -
Dec 1, 1989
priority date (Note) -
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Abstract
A readily biodegradable bleaching bath having an adequate bleaching effect (1) contains an iron(III) complex salt in which at least 20 mol-% and preferably at least 80 mol-% of the complexing agent corresponds to formula (I) ##STR1## in which R.sub.1 is hydrogen or hydroxy, n is 1 or 2, x is 2 or 3 and y is 0 or 1 and the sum of x and y is always 3, and (2) an excess of free complexing agent of 1 to 120 mol-% and preferably 5 to 20 mol-%, based on the iron complex or the iron complex salt, and (3) is adjusted to a pH value of .ltoreq.4.5.
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