Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Patent
1997-09-10
1999-07-20
Fries, Kery
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
510305, 510309, 510312, 510320, 510321, 510318, 510335, 510361, 510373, 510477, C11D 3386, C11D 3395, C11D 337
Patent
active
059256095
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to non-phosphate builder-containing detergent compositions. More particularly, the invention relates to non-phosphate detergent compositions, comprising a surfactant, a source of hydrogen peroxide, an organic peroxyacid precursor, a proteolytic enzyme and an alkalinity source, which provide effective soil/stain removal.
BACKGROUND OF THE INVENTION
The satisfactory removal of soils/stains is a particular challenge to the formulator of a detergent composition for use in a washing process such as laundry or machine dishwashing process.
Traditionally, the removal of soils/stains has been achieved by the use of bleach components such as oxygen bleaches, including hydrogen peroxide and organic peroxyacids, and also by enzyme components.
Oxygen bleaches are known to effectively decolourise pigments from soiled/stained substrates.
Enzymes are also known as effective soil/stain removal agents, for example, in the removal of proteinaceous stains/soils such as blood, egg, chocolate, gravy and the like.
Phosphorus containing compounds such as sodium tripolyphosphate have effective builder properties; however environmental concerns have made the use of phosphorus containing compounds less attractive in detergent compositions.
A problem encountered with the use of high levels of oxygen bleaches is the propensity of these oxygen bleaches to lead to stain fixing and/or darkening. Furthermore, high levels of oxygen bleaches increase the cost of the detergents to the consumer. On the other hand low levels of oxygen bleaches can lead to poor stain/soil removal performance, especially when used in a non-phosphate builder containing composition.
A problem encountered with the use of peroxyacids in machine dishwashing methods is the tarnishing/corrosion of any silverware components of the washload. Such a problem, disclosed in GB Patent Application No 9407533.0, is known in the art. Oxygen bleaches tend to give rise to more of a problem of tarnishing than chlorine bleaches. The level of tarnishing observed can range from slight discoloration of the silverware to the formation of a dense black coating on the surface of the silverware.
A problem encountered with the use of enzymes as components of detergents is that enzyme activity in the wash may be affected by the presence of other detergent components in the wash solution. GB Patent Application No 9407533.0 discloses that enzymes may be degraded by bleach components.
The detergent formulator thus faces the challenge of formulating an environmentally friendly product which maximises soil/stain removal without fixing and/or darkening stains/soils, which avoids degradation of the detergent components and which is also inexpensive.
Pending GB Patent Application No 9407536.3 that forms part of the state of the art under Article 54(3) EPC discloses the use of a bleach containing detergent composition which contains low levels of bleach and bleach activator with higher levels of chelant and enzyme and defines a specific Biological Bleach Index which provides stain removal performance. Specific kinetics of bleach delivery are not disclosed, nor are the means to achieve such kinetics.
Pending GB Patent Application No 9407533.0 that forms part of the state of the art under Article 54(3) EPC discloses the use of an enzyme together with a source of peroxyacid bleach, wherein a means is provided for delaying the release to the wash solution of said peroxyacid bleach relative to the release of said enzyme. The delayed release is provided by coating the source of peroxyacid bleach. The coating may occur on the hydrogen peroxide source itself and/or the peroxyacid bleach precursor itself. Specific ratios of hydrogen peroxide: precursor: protease are not disclosed.
The Applicants have found that the occurrence of soil/stain fixing and/or darkening effects arising from use of peroxyacid bleaches in a washing method is related to the rate of release of the hydrogen peroxide source. A fast rate of release of the hydrogen peroxide source to the was
REFERENCES:
patent: 4105827 (1978-08-01), Brichard et al.
patent: 4483778 (1984-11-01), Thompson et al.
patent: 4536314 (1985-08-01), Hardy et al.
patent: 4619779 (1986-10-01), Hardy
patent: 4919845 (1990-04-01), Vogt et al.
patent: 4988363 (1991-01-01), Barnes et al.
patent: 5196133 (1993-03-01), Leslie et al.
patent: 5256168 (1993-10-01), Morrall et al.
patent: 5405413 (1995-04-01), Willey et al.
patent: 5470510 (1995-11-01), Willey et al.
patent: 5482642 (1996-01-01), Agar et al.
patent: 5584888 (1996-12-01), Miracle et al.
patent: 5705466 (1998-01-01), Baillely et al.
Baillely Gerard Marcel
Hartshorn Richard Timothy
Vermote Christian Leo Marie
Cook C. Brant
Fries Kery
Procter & Gamble Company
Rasser Jacobus C.
Zerby Kim W.
LandOfFree
Detergent composition comprising source of hydrogen peroxide and does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Detergent composition comprising source of hydrogen peroxide and, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Detergent composition comprising source of hydrogen peroxide and will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1321824