Photographic bleach solutions
AssigneeFuji Photo Film Co., Ltd.
InventorsYoshio Idota, Minoru Yamada
Life of this patent
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Abstract
A bleach solution for color photographic materials having a high bleaching activity and capable of providing color images having good quality containing hydrogen peroxide or a compound releasing hydrogen peroxide, an organic metal complex salt, and an unsubstituted or substituted aromatic sulfonic acid or a salt thereof.
Claims23
A bleach solution for silver halide color photographic materials comprising hydrogen peroxide and/or a compound releasing hydrogen peroxide, an organic metal complex salt which is a chelate of a polycarboxylic acid represented by formula (I), an aminopolycarboxylic acid represented by formula (II) or an organic phosphonic acid represented by formula (III-a) or (III-b) and a high valent metal ion,
- R.sub.1 (COOH).sub.l (I)
- wherein R.sub.1 represents a single bond, an unsubstituted or substituted alkylene group having 1 to 6 carbon atoms wherein the substituent is a hydroxy group and/or a carboxy group, a --(CH.sub.2).sub.m --O--(CH.sub.2).sub.n -- group wherein m and n are integers and m+n is 2 to 6, a --(CH.sub.2).sub.m' --S--(CH.sub.2).sub.n' -- group wherein m' and n' are integers and m'+n' is 2 to 6, or an alkenylene group having 2 to 6 carbon atoms;
- l represents an integer of 2 to 3;
- and when R.sub.1 is a single bond, l is 2, ##STR5## wherein R.sub.2, R.sub.3, R.sub.4 and R.sub.5 each represents a carboxyalkyl group wherein the alkyl moiety has 1 to 2 carbon atoms, a hydroxyalkyl group having 1 to 2 carbon atoms and/or a hydrogen atom;
- p represents zero or an integer of 1 to 3;
- L represents an alkylene group having 2 to 4 carbon atoms, a --CH.sub.2).sub.x [O--CH.sub.2).sub.y ].sub.z group wherein x is an integer of 2 to 4, y is an integer of 2 to 4 and z is an integer of 1 to 3, a 6-membered cyclic alkylene group, or an arylene group;
- and the aminopolycarboxylic acid of the formula (II) has at least 1 carboxy group,
- R.sub.6 --PO.sub.3 H.sub.2).sub.q (III-a)
- R.sub.6 --LPO.sub.3 H.sub.2).sub.q (III-b)
- wherein R.sub.6 represents a substituted or unsubstituted alkyl or alkylene group having 1 to 4 carbon atoms wherein the substituent is a hydroxy group and/or a carboxy group, or a substituted or unsubstituted diaminoalkylene group having 2 to 16 carbon atoms wherein the substituent is a hydroxy group;
- L represents an alkylene group having 1 to 2 carbon atoms;
- and q represents an integer of 1 to 5, and at least one aromatic sulfonic acid or salt or salt thereof, said aromatic sulfonic acid or salt thereof being present in an concentration of 10.sup.-3 to 0.1 mole per liter of bleaching solution, said bleach solution having a pH of about 1 to 8.
In a process for developing a color photographic material including a bleaching step, the improvement which comprises bleaching said material in a solution containing hydrogen peroxide and/or a compound capable of releasing hydrogen peroxide, an organic metal complex salt which is a chelate of an aminopolycarboxylic acid, an organic phosphonic acid, or a polybasic organic acid and a high valent metal ion, and at least one aromatic sulfonic acid or salt thereof, said aromatic sulfonic acid or salt thereof being present in a concentration of 10.sup.-3 to 0.1 mole per liter of bleaching solution.
Dependencies are inferred from the claim text.