Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – Specific organic component
Reexamination Certificate
2002-12-16
2004-03-23
Mruk, Brian P. (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
Specific organic component
C510S360000, C510S361000, C510S476000, C510S477000, C510S499000
Reexamination Certificate
active
06710024
ABSTRACT:
The present invention relates to detersive substances comprising water-soluble block copolymers. The present invention further relates to a process for preparing such detersive substances and to the use of specific block copolymers for preparing such detersive substances.
Detersive compositions are customarily used for cleaning soiled textiles, especially soiled clothing. A problem may arise here because textiles of any kind, but in particular textiles as used in the manufacture of clothing, are customarily made up of a multiplicity of different fabrics which, moreover, have been provided with different colors by a wide variety of dyeing processes.
There are in addition textiles which have not been subject to a particular dyeing process, but which, for example by bleaching, have been converted into a colorless, i.e. white, state and are used in that form.
The cleaning of textiles by means of detersive substances is intended to remove soil from the textiles without significantly affecting the original appearance of the textiles with regard to color and texture. While this task is relatively easy to accomplish for single-color textiles which, moreover, are ideally made of a single material, the cleaning of multicolored textiles or of a mixture of textiles having different colors presents problems. A particular problem in this context is presented by the cleaning of textiles or textile mixtures possessing light colors and dark colors, for example white and blue or white and black. Here the use of customary detersive substances will frequently cause a transfer of color from the dark textiles or textile constituents to the lighter ones, so that a textile article which was, say, white before laundering may have a darker color thereafter.
However, such transfers of color are unwelcome to the users of detersive substances, since the appearance of the textiles is generally adversely affected as a result.
A multiplicity of proposals have been made in the past to solve this problem.
For instance, DE-A-2 232 353 describes a washing and cleaning agent mixture possessing an improved inhibiting effect with regard to dye transfer. This reference proposes that color transfer may be inhibited by including a water-soluble polymer based on polyvinylpyrrolidone in a washing and cleaning agent mixture. For example, a copolymer of polyvinylpyrrolidone with acrylonitrile or maleic anhydride is said to be advantageous. However, the copolymers mentioned do not have a block structure.
DE-A-2 814 287 likewise describes a washing agent that contains discoloration-inhibiting additives. It proposes that discolorations occurring during washing may be prevented by including a water-soluble or -dispersible homo- or copolymer of N-vinylimidazole in a washing and cleaning agent. The polymers described, however, likewise have no block structure.
It is an object of the present invention to provide detersive compositions that substantially prevent dye transfer during the wash.
We have found that this object is achieved by a detersive composition as described hereinbelow.
A block copolymer for the purposes of the present invention is a polymer that has at least two blocks characterized by different monomer compositions. “Different monomer compositions” in the context of the present invention is to be understood as meaning that at least two regions of the block copolymer have different monomer compositions. It is possible in the context of the present invention that the transition between two blocks is continuous, i.e. that there exists a zone between two blocks which has a random or regular sequence of the monomers constituting the blocks. In the context of the present invention, however, it is similarly envisaged that the transition between two blocks be substantially discontinuous. By “a substantially discontinuous transition” is meant a transition zone which has a distinctly shorter length than at least one of the blocks separated by the transition zone. It is possible in this connection that a block may be based on one type of monomer only. However, it is similarly envisaged that a block may be composed of two or more monomers. In a preferred embodiment of the present invention, the chain length of such a transition zone is less than {fraction (1/10)}, preferably less than {fraction (1/20)}, of the block length of at least one of the blocks separated by the transition zone.
In the context of the present invention, “different monomer compositions” is further to be understood as meaning that the monomers constituting the respective block differ in at least one feature, for example in their linkage to one another, in their conformation or in their constitution. When, as already described above a block is based on more than one type of monomer, blocks of the block copolymer which are different in the present context may also differ, for example, in having different concentrations of the monomers constituting each block. In the context of the present invention, preference is given to the use of block copolymers which have at least two blocks whose monomer compositions differ at least in the constitution of the monomers.
The present invention accordingly provides a detersive composition comprising at least
a) from 0.01 to 50% by weight of a water-soluble or water-dispersible block copolymer A which has a molecular weight of more than 1 000 and is preparable by a process comprising the following steps (i) and (ii):
(i) free-radically reacting a reaction mixture comprising at least one free-radically reactive monomer (a) in the presence of at least one free radical of the formula (III)
where R
1
to R
3
are each independently hydrogen, methyl or a group which stabilizes free radicals and/or is bulky and which is selected from the group consisting of substituted or unsubstituted, linear or branched-chain alkyl of two or more carbon atoms, substituted or unsubstituted cycloalkyl radicals, substituted or unsubstituted alcohol radicals, substituted or unsubstituted ether radicals, substituted or unsubstituted polyether radicals, substituted or unsubstituted amine radicals, substituted or unsubstituted aralkyl radicals, substituted or unsubstituted aromatic, heterocyclic or olefinic hydrocarbon, halogen atoms (Hal), substituted or unsubstituted, linear or branched-chain alkenyl or alkynyl groups, —C(O)R
5
, —C(O)OR
5
, —CR
5
R
6
—O—R
7
, —O—C(O)R
5
, —CN, —O—CN, —S—CN, —O—C═NR
5
, —S—C═NR
5
, —O—CR
5
R
6
—CR
7
R
8
NR
9
R
10
, —N═C═O, —C═NR
5
, —CR
5
R
6
-Hal, —C(S)R
5
, —CR
5
R
6
—P(O)R
7
R
8
, —CR
5
R
6
—PR
7
R
8
,
—CR
5
R
6
—NR
7
R
8
, —CR
5
R
6
(OR
7
)(OR
8
), —CR
5
R
6
(OR
7
)(NR
8
), —CR
5
R
6
(NR
7
)(NR
8
), an acid anhydride, acetal or ketal group, —SO
2
R
5
, an amidine group —NR
5
C(S)NR
6
, —NR
5
C(S)—OR
6
, —N═C═S, —NO2, —C═N—OH, —N(R
5
)═NR
6
, —PR
5
R
6
R
7
,
—OSiR
5
R
6
R
7
, and —SiR
5
R
6
R
7
, where R
5
to R
10
are each independently defined as R
1
to R
4
or two of R
1
to R
4
form a C
4
- to C
7
-ring, which in turn may be substituted or unsubstituted, and may optionally contain one or more heteroatoms,
with the proviso that at least two of R
1
to R
3
are a group, as defined above, which stabilizes free radicals and/or is bulky, and
(ii) free-radically reacting the product of step (i) in the presence of at least one free-radically homo- or copolymerizable monomer (b) and
b) from 50 to 99.99% by weight of an anionic, cationic, zwitterionic or nonionic surfactant having a molecular weight of less than 1 000.
Preferably the free radical of the formula (III) is derived from at least one compound of the formula (I),
where R
1
to R
4
are each independently hydrogen, methyl or a group which stabilizes free radicals and/or is bulky and which is selected from the group consisting of substituted or unsubstituted, linear or branched-chain alkyl of two or more carbon atoms, substituted or unsubstituted cycloalkyl radicals, substituted or unsubstituted alcohol radicals, substituted or unsubstituted ether radicals, substituted or unsubstituted polyether radicals,
Brinkmann-Rengel Susanne
Haremza Sylke
Raether Roman Benedikt
BASF - Aktiengesellschaft
Mruk Brian P.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
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