Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – With oxygen or halogen containing chemical bleach or oxidant...
Reexamination Certificate
2002-05-09
2003-01-07
Gupta, Yogendra N. (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
With oxygen or halogen containing chemical bleach or oxidant...
C510S419000
Reexamination Certificate
active
06503877
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to liquid coloured thickened bleaching compositions, in particular to liquid coloured thickened hypochlorite bleaching compositions, which can be used to bleach various surfaces including but not limited to, hard-surfaces like walls, tiles, floors, glass, bathrooms surfaces, kitchen surfaces, toilet bowls, dishes as well as fabrics, clothes, carpets and the like.
BACKGROUND OF THE INVENTION
Thickened bleaching compositions are well-known in the art. Amongst the different thickened bleaching compositions available, those relying on bleaching by hypohalite bleaches such as hypochlorite are often preferred, mainly for performance reasons.
Preferably viscosity will be build up by a so called ‘self thickening surfactant or surfactant system’ as opposed to using a thickener for that specific purpose. Indeed, thickeners, such as gums, polymers have at least one drawback that they affect the formula cost, while providing only one benefit, which is thickening. They do not participate to the actual cleaning of the surface and therefore represent “inert” materials.
Thus, it is desirable to formulate liquid thickened bleaching compositions based on hypohalite bleach, especially liquid coloured thickened bleaching compositions, with the help of a viscosifying surfactant which on top of its viscosifying properties also delivers good cleaning performance, i.e. good stain removal performance on a variety of stains including greasy stains and/or enzymatic stains and the like.
There is a further need to liquid coloured thickened bleaching compositions based on hypohalite bleach and a viscosifying surfactant that are chemically and physically stable upon ageing of the compositions, i.e., for prolonged periods of storage after their manufacturing. Indeed, it is desirable to provide liquid coloured thickened hypohalite bleach-containing compositions which have stable coloration upon prolonged periods of storage, i.e., which retain an homogeneous coloration during prolonged periods of storage.
It is therefore an object of the invention to provide a stable liquid coloured thickened hypohalite bleach-containing composition comprising a viscosifying surfactant, said composition being physically and chemically stable upon ageing of the composition while delivering excellent stain removal performance on a variety of stains.
The Applicant has thus now surprisingly found that this problem is solved by formulating a liquid thickened bleaching composition having a viscosity of 10 cps to 2000 cps, when measured with a carri-med CSL2-100® rheometer at the following viscosity parameters: angle 1°58′, gap 60 &mgr;m, diameter 4.0 cm, inner 63.60 dyne*cm*s
2
, temperature of 25° C. and a shear rate of 30 sec
−1
, said composition comprising a hypohalite bleach, an alkyl (alkoxy)
2-4
sulphate, optionally a co-surfactant and a pigment selected from the group consisting of Ultramarine Blue (Na
7
Al
6
Si
6
O
24
S
2
) and its equivalents, chlorinated indanthrone and its equivalents, cobalt aluminate blue and mixtures thereof. Indeed, it has been found that the addition of such a pigment in a liquid self-thickened hypohalite bleach-containing composition according to the present invention comprising a hypohalite bleach, an alkyl (alkoxy)
2-4
sulphate, and optionally a co-surfactant, does not negatively affect the chemical and physical stability of the composition upon ageing, i.e., upon prolonged periods of storage after its manufacturing. In other words, the present invention provides liquid coloured thickened hypohalite bleach-containing compositions with enhanced rheological properties which are capable of stably suspending the pigments.
In a preferred embodiment, the compositions of the present invention further comprise a stabilising agent preferably a radical scavenger, a chelating agent or a mixture thereof. Indeed it has been found that the addition of such a stabilising agent, preferably a radical scavenger alone or together with a chelating agent, in a liquid coloured thickened bleaching composition comprising a hypohalite bleach, an alkyl (alkoxy)
2-4
sulphate, optionally a co-surfactant and the pigment, improves the rheological stability of this composition upon ageing, i.e. upon prolonged periods of storage after its manufacturing, as compared to the Theological stability of the same composition without any such stabilising agent, upon ageing of the composition. In other words, adding such a stabilising agent reduces or even prevents lowering of the viscosity of the compositions upon prolonged periods of storage which could otherwise happen in absence of this stabilizing agent. Indeed in absence of such a stabilizing agent the viscosifying surfactant may be decomposed by the hypohalite bleach present and thus may lose its viscosifying potential. Additionally the presence of such a stabilizing agent in the preferred coloured thickened bleaching compositions of the present invention further contributes to the benefits of the compositions herein, i.e., to provide chemical and physical stable coloured compositions that retain their colour upon prolonged periods of storage.
Another advantage of the compositions of the present invention is that they deliver effective bleaching performance, more particularly effective whiteness performance when used in any laundry application, as well as effective stain removal performance on various stains including greasy stains like lipstick, make up, sebum, oil (mineral and vegetable), mayonnaise, eggs and the like and/or enzymatic stains like grass, cocoa, blood and the like, even upon ageing of the composition. In a preferred embodiment wherein the liquid coloured thickened compositions of the present invention further comprise a stabilising agent, the presence of such a stabilizing agent further contributes to deliver effective bleaching performance and/or effective stain removal performance on various stains upon ageing of the compositions.
Advantageously the compositions of the invention are suitable for the bleaching of different types of surfaces including hard-surfaces like floors, walls, tills, glass, kitchen surfaces, bathrooms surfaces, toilet bowls and/or dishes and the like as well as fabrics. More particularly, the compositions of the present invention are suitable for bleaching any type of fabrics including natural fabrics (e.g., fabrics made of cotton, viscose, linen, silk and wool), synthetic fabrics such as those made of polymeric fibers of synthetic origin as well as those made of both natural and synthetic fibers. Indeed, the compositions of the present invention may be used on synthetic fibers despite a standing prejudice against the use of hypohalite bleaches, especially hypochlorite bleaches, on synthetic fibers, as evidenced by warning on labels of commercially available hypochlorite bleaches and clothes. Advantageously the compositions of the present invention are not only safe to the fabrics perse bleached therewith but also to the fabrics colours.
A further advantage of the liquid bleaching compositions of the present invention is that said bleaching compositions are suitable for various laundry bleaching applications both when used in diluted conditions, e.g. as a detergent additive or a fully formulated laundry detergent composition, and when used in neat condition, e.g. as a liquid pretreater (spotter).
SUMMARY OF THE INVENTION
The present invention is a liquid coloured thickened bleaching composition having a viscosity of from 10 cps to 2000 cps, when measured with a Carri-med CSL2-100® rheometer, at the following viscosity parameters: angle 1°58′, gap 60 &mgr;m, diameter 4.0 cm, inner 63.60 dyne*cm*s
2
, temperature of 25° C. and a shear rate of 30 sec
−1
and comprising
a hypohalite bleach,
an alkyl (alkoxy)
n
sulphate, wherein n is from 2 to 4
optionally a co-surfactant,
and a pigment selected from the group consisting of Ultramarine Blue (Na
7
Al
6
Si
6
O
24
S
2
) and its equivalents, chlorinated indanthrone and its equivalents, cobalt aluminate blue and mixt
Grande Giovanni
Todini Oreste
Gupta Yogendra N.
McBride James F.
Miller Steven W.
Petruncio John M
The Procter & Gamble & Company
LandOfFree
Stable colored thickened bleaching compositions does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Stable colored thickened bleaching compositions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Stable colored thickened bleaching compositions will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3059731