Fabric care method

Details Fabric care method Fabric care method

2001-04-13

2002-11-26

Delcotto, Gregory (Department: 1751)

Cleaning compositions for solid surfaces, auxiliary compositions

Cleaning compositions or processes of preparing

For cleaning a specific substrate or removing a specific...

C510S372000, C510S376000, C252S186330, C008S111000, C008S137000

Reexamination Certificate

active

06486110

ABSTRACT:

The present invention relates to a process for inhibiting the re-absorption of migrating dyes in the wash liquor.
It is well known that various metal compounds, e.g. manganese complexes, are useful in detergents as catalysts for oxidation with peroxygen compounds such as perborate or peroxides. It is also known that certain other manganese complexes cause enhanced bleaching effects on dirt or dyes in the wash bath. Moreover, these manganese complexes do not exhaust at all on to cotton, polyamide or polyester fibres so that the complexes cannot lead to fibre discolouration problems.
One problem associated with the evaluation of a compound as a candidate for use in a process for inhibiting the re-absorption of migrating dyes in the wash liquor, is the lack of a sufficiently reliable and comprehensive screening technique. Such a technique has now been developed and used to quantify the dye transfer inhibition performance of potential substances. This screening procedure comprises a variety of tests which makes it possible to determine the usefulness/damage balance of any candidates on a quantitative basis. A product is characterised in terms of its specific effectivity, scope of use, compatibility with the most important system components, oxygen demand and its fibre- and dyestuff degradation potential. Moreover, the precision of the data is such that structure/effect relationships can be developed. The application of the new evaluation technique to manganese complexes has resulted in the identification of further manganese complexes which exhibit excellent performance as dye transfer inhibitors, which are of relatively low molecular weight and the effectiveness of which is substantial even at low levels of addition.
Accordingly, the present invention provides a process for inhibiting the re-absorption of migrating dyes in the wash liquor, comprising introducing into a wash liquor containing a peroxide-containing detergent, from 0.5 to 150, preferably from 1.5 to 75, especially from 7.5 to 40 mg, per liter of wash liquor, of one or more compounds having the formula:
in which n is 1, 2 or 3;
A is an anion;
R
1
is hydrogen or C
1
-C
4
-alkyl,
Y is linear or branched alkylene of the formula —[C(R
1
)
2
]
m
in which m is an integer ranging from 1 to 8 and each R
1
independently from the other has its previous significance; —CX═CX— in which X is cyano, linear or branched C
1
-C
8
-alkyl or di(linear or branched C
1
-C
8
-alkyl-amino;
—(CH
2
)
q
—NR
1
(CH
2
)
q
— in which R
1
has its previous significance and q is 1, 2, 3 or 4; or a 1,2-cyclohexylene or phenylene residue having the formula:
in which R
7
is hydrogen, CH
2
OH or CH
2
NH
2
or SO
3
M, where M is hydrogen, an alkali metal atom, ammonium or a cation formed from an amine,
R and R′ are each independently from the other cyano; halogen; hydroxy; OR
1
or COOR
1
in which R
1
has its previous significance; nitro; linear or branched partially or completely fluorinated C
1
-C
8
-alkyl; NR
3
R
4
in which R
3
and R
4
are the same or different and each is hydrogen or linear or branched C
1
-C
12
-alkyl; —N
⊕
R
1
R
3
R
4
in which R
1
, R
3
and R
4
have their previous significance or linear or branched C
1
-C
8
-alkylene-R
2
in which R
2
is OR
1
, COOR
1
or NR
3
R
4
,
R
5
and R
6
are each independently from the other hydrogen; linear or branched C
1
-C
4
-alkyl; unsubstituted aryl or aryl which is substituted by cyano, halogen, OR
1
or COOR
1
, nitro, linear or branched C
1
-C
8
-alkyl, NR
3
R
4
in which R
3
and R
4
are the same or different and each is hydrogen or linear or branched C
1
-C
12
-alkyl; —N
⊕
R
1
R
3
R
4
in which R
1
, R
3
and R
4
have their previous significance or linear or branched C
1
-C
8
-alkylene-R
2
in which R
2
is OR
1
, COOR
1
or NR
3
R
4
,
with the proviso that each n is 1, if R and R′ are both C
1
-C
4
-alkyl.
When Y is a 1,2-cyclohexylene residue, this residue may be in any of its cis/trans stereoisomeric forms.
Y is preferably —[C(R
8
)
2
]
2
wherein R
8
is hydrogen or methyl, —CX═CX— in which X is cyano, —(CH
2
)
q
—NR
8
—(CH
2
)
q
— in which R
8
has its previous significance and q is 1, 2, 3 or 4; or a 1,2-cyclohexylene or phenylene residue having the formula:
Preferred halogen atoms R or R′ are chlorine, bromine and fluorine atoms.
When n is 1, preferably the group R or R′ respectively is in the 4-position of the respective benzene ring, with the exceptions that when R or R′ is nitro or CO
2
R
2
, the group R or R′ is preferably in the 5-position of the respective benzene ring. When n is 2, preferably the groups R or R′ are in the 4,6-positions of the respective benzene ring, with the exceptions that when R or R′ is nitro or CO
2
R
2
the groups R or R′ are preferably in the 3,5-positions of the respective benzene ring.
When R or R′ is the group di-(C
1
-C
12
alkyl)amino, the alkyl moiety may be a straight- or branched chain alkyl moiety, and it preferably contains from 1 to 8, more preferably from 1 to 4 and, especially, 1 or 2 carbon atoms.
Preferred groups R and R′ are dimethylamino, diethylamino, hydroxy, methoxy, ethoxy, chloro or nitro.
Anions A include halide, especially chloride, perchlorate, sulphate, nitrate, hydroxide, BF
4
−
, PF
6
−
, carboxylate, especially acetate, triflate or tosylate.
Some of the compounds of formula (1) and the ligands from which they are derived are known compounds. For example, in U.S. Pat. No. 5,281,578 there is described the preparation of N,N-bis(4-dimethylaminosalicylidene)diiminoethylene; in EP-A-0 693 550 there is disclosed the production of the manganese complex of N,N-bis(4-diethylaminosalicylidene)diiminoethylene; and in Bernado et.al., Inorg. Chem. 35 (2) 387 (1996), there is disclosed the production of N,N-bis(4-diethylaminosalicylidene)diiminocyclohexylene as well as the production of the manganese complex N,N-bis(4-diethylaminosalicylidenediiminocyclohexylene. New compounds of formula (1) and new ligands from which they are derived form further aspects of the present invention.
Moreover, the use, as dye transfer inhibitors, of those compounds of formula (1) in which A is an anion and a) Y is —CH
2
CH
2
— each R is di-(C
1
-C
2
alkyl)amino; or b) Y is cyclohexylene and each R is di-(C
1
-C
2
alkyl)amino has been broadly indicated, but not specifically described, in GB-A-2,296,015. On the other hand, the use, as dye transfer inhibitors, of those compounds of formula (1) in which A is an anion, Y is —CH
2
CH
2
— and each R is hydroxy, is believed to be completely new.
Of particular interest for use in in the method of the present invention are those compounds of formulae:
The present invention also provides a detergent composition comprising:
i) 5-90%,preferably 5-70% of A) an anionic surfactant and/or B) a nonionic surfactant;
ii) 5-70%, preferably 5-50%, especially 5-40% of C) a builder;
iii) 0.1-30%, preferably 1-12% of D) a peroxide; and
iv) 0.005-2%, preferably 0.02-1%, especially 0.1-0.5% of E) a compound of formula (1) or (2) as defined above, each by weight, based on the total weight of the detergent.
The detergent may be formulated as a solid; or as a non-aqueous liquid detergent, containing not more than 5, preferably 0-1 wt.% of water, and based on a suspension of a builder in a non-ionic surfactant, as described, e.g., in GB-A-2158454.
Preferably, the detergent is in powder or granulate form.
Such powder or granulate forms may be produced by firstly forming a base powder by spray-drying an aqueous slurry containing all the said components, apart from the components D) and E); then adding the components D) and E) by dry-blending them into the base powder. In a further process, the component E) may be added to an aqueous slurry containing components A), B) and C), followed by spray-drying the slurry prior to dry-blending component D) into the mixture. In a still further process, component B) is not present, or is only partly present in an aqueous slurry containing components A) and C); component E

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