Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – With oxygen or halogen containing chemical bleach or oxidant...
Reexamination Certificate
1998-11-25
2001-06-05
Gupta, Yogendra (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
With oxygen or halogen containing chemical bleach or oxidant...
C510S309000, C510S372000
Reexamination Certificate
active
06242408
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to organosilyl peroxide compounds which are stable in aqueous systems and are used for bleaching and cleaning applications. More particularly, this invention is concerned with the stability of bis(organosilyl)peroxides when formulated in aqueous and non-aqueous delivery systems. The liquid detergents containing the bleaching agent compositions of this invention exhibit excellent bleaching performance and stain removal properties on fabrics at typical low wash temperatures.
BACKGROUND OF THE INVENTION
Peroxygen bleaching agents, such as hydrogen peroxide, or precursors to hydrogen peroxide such as sodium perborate and sodium percarbonate, are commonly used as bleaching agents in heavy duty granular detergents for laundry application. Attempts have been made in the past to incorporate peroxy bleaching agents in aqueous and non-aqueous liquid detergents for a stable composition and there has always been a lack of stability of peroxy bleaching agent due to its high solubility in aqueous mediums and the decomposition of unstable hydrogen peroxide. Thus, there is no liquid detergent containing bleach commercially available which has an acceptable degree of chemical stability.
Heavy duty liquid detergent compositions (HDL's) commercially available at present typically comprise organic surfactants, enzymes and perfumes. These component; are generally incompatible with peroxygen bleaches. Therefore, no peroxygen bleach containing liquid detergent compositions are commercially available which have long term storage stability.
The preparation of alkyl and aryl silicon peroxide and their uses in washing compositions have been disclosed. For example, in PCT Patent Publication No. W09714701 is disclosed the preparation of alkyl and aryl silicon peroxides by the reaction of alkoxy or aryloxysilane with H
2
O
2
, more specifically tetraalkoxy and tetraaryloxy silane with H
2
O
2
and the use of these silicon peroxides as bleaches.
In European Patent Publication No. 0812907 is disclosed the use of hydroperoxides such as organomineral hydroperoxides including (CH
3
)
3
SiOOH, (C
6
H
5
)
2
CH
3
SiOOH, (C
6
H
5
)
3
SiOOH and (n-C
6
H
13
)
3
SiOOH in a bleaching composition. EP'907 also discloses a process of bleaching fabrics, starting from a liquid composition comprising a hydroperoxide, and discloses that improved fabric safety in terms of loss of tensile strength in the fabrics is obtained by using the hydroperoxides which generate free radicals of lower reactivity.
It has been surprisingly found that the stable aqueous liquid bleach containing detergents can be obtained by using bis(organosilyl)peroxide as a source of active oxygen. The bis(organosilyl)peroxide containing aqueous emulsions and solutions are stable over a wide range of pH and showed a little or no loss of peroxy content when stored for six months at 25° C.
SUMMARY OF THE INVENTION
This invention relates to a stable liquid bleaching agent composition comprising a bis(organosilyl)peroxide, at least one surfactant selected from the group consisting of at least one nonionic surfactant, at least one anionic surfactant, and a mixture of at least one nonionic surfactant and at least one anionic surfactant, and water.
This invention further relates to a stable liquid bleaching agent composition comprising a bis(organosilyl)peroxide and at least one water soluble alcohol.
It is an object of this invention to produce stable liquid bleaching agent compositions which are stable in solutions and emulsions over a wide range of pH and show a little or no loss of peroxy content when stored for long periods of time.
It is another object of this invention to produce bleaching agent compositions which are useful in laundry detergents.
It is another object of this invention to produce a bleaching agent composition which when added to a laundry detergent, provides the laundry detergent with excellent stain removal at low wash temperatures.
DETAILED DESCRIPTION OF THE INVENTION
This invention relates to a stable liquid bleaching agent composition comprising: (A) a bis(organosilyl)peroxide having its formula selected from the group consisting of
(iii) a mixture of (i) and (ii)
wherein each R
1
and each R
2
is independently selected from the group consisting of hydrogen, alkyl groups, cycloalkyl groups, aryl groups, alkenyl groups, polyoxyethylene groups, polyoxypropylene groups, and polyoxyethylene-polyoxypropylene groups, or R
1
and R
2
together form a silicon-containing heterocyclic ring, (B) at least one surfactant selected from the group consisting of at least one nonionic surfactant, at least one anionic surfactant, and a mixture of at least one nonionic surfactant and at least one anionic surfactant, and (C) water.
The alkyl groups of R
1
and R
2
are exemplified by methyl, ethyl, propyl, butyl, tert-butyl, hexyl, 2-ethylhexyl, n-octyl, decyl, dodecyl, and n-octadecyl, the aryl groups are exemplified by phenyl, tolyl, and xylyl, the cycloalkyl groups are exemplified by cyclopentyl and cyclohexyl, and the alkenyl groups are exemplified by vinyl, allyl, propenyl, butenyl, and hexenyl.
The polyoxyethylene groups are exemplified by groups having the formula —R
3
(OC
2
H
4
)
a
OR
4
wherein R
3
is a divalent hydrocarbon group having from 1 to 20 carbon atoms, R
4
is selected from the group consisting of a hydrogen atom, an alkyl group, an aryl group, and an acyl group, and a has an average value from 1 to 150.
The group R
3
is a divalent hydrocarbon group having from 1 to 20 carbon atoms which is exemplified by alkylene groups exemplified by methylene, ethylene, trimethylene, tetramethylene, 2-methyltrimethylene, pentamethylene, hexamethylene, 3-ethyl-hexamethylene, octamethylene, decamethylene, dodecamethylene, and octadecamethylene, and cycloalkylene radicals such as cyclohexylene, arylene radicals such as phenylene, combinations of divalent hydrocarbon radicals such as benzylene (—C
6
H
4
CH
2
—), and oxygen containing groups such as —CH
2
OCH
2
—, —CH
2
CH
2
CH
2
OCH
2
—, —CH
2
CH
2
OCH
2
CH
2
—, —COOCH
2
CH
2
OOC—, —CH
2
CH
2
OCH(CH
3
)CH
2
—, and —CH
2
OCH
2
CH
2
OCH
2
CH
2
—. Preferred alkylene groups have from 2 to 8 carbon atoms.
The group R
4
can be a hydrogen atom, an alkyl group, an aryl group, or an acyl group. The alkyl groups are exemplified by methyl, ethyl, propyl, butyl, hexyl, octyl, and decyl. The aryl groups are exemplified by phenyl, tolyl, and xylyl. The acyl group can have from 1 to 20 carbon atoms and include groups such as acetyl, propionyl, butyryl, isobutyryl, lauroyl, myristoyl, and stearoyl 3-carboxypentadecanoyl. Preferably the acyl group is a group having the formula —OCR
5
wherein R
5
denotes a monovalent hydrocarbon group. The monovalent hydrocarbon groups of R
5
are preferably lower alkyl groups such as methyl, ethyl, or butyl. Preferably a has a value of 1 to 36.
The polyoxypropylene groups are exemplified by groups having the formula —R
3
(OC
3
H
6
)
b
OR
4
wherein R
3
is a divalent hydrocarbon group having from 1 to 20 carbon atoms, R
4
is selected from the group consisting of a hydrogen atom, an alkyl group, an aryl group, and an acyl group, and b has an average value from 1 to 150. The groups R
3
and R
4
are as defined above, including preferred embodiments thereof. Preferably b has a value of 1 to 36.
The polyoxyethylene-polyoxypropylene groups are exemplified by a group having the formula —R
3
(OC
2
H
4
)
a
(OC
3
H
6
)
b
OR
4
wherein R
3
is a divalent hydrocarbon group having from 1 to 20 carbon atoms, R
4
is selected from the group consisting of a hydrogen atom, an alkyl group, an aryl group, and an acyl group, and a and b have an average value from 1 to 150. The groups R
3
and R
4
are as defined above, including preferred embodiments thereof. Preferably a and b have a value of 1 to 36.
The groups R
1
and R
2
together can form a silicon-containing heterocyclic ring, in such a case, Component (A) is exemplified by bis(cyclotetramethylenesilyl)peroxide.
Each R
1
and R
2
can be the same or different, as desired. It is preferre
Elms Russell Allen
Renauld Franck
Tomar Anil K.
Dow Corning Corporation
Gupta Yogendra
Petruncio John M
Troy Timothy J.
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