Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Patent
1996-05-21
1998-06-30
Lieberman, Paul
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
510309, 510317, 510349, 510375, 510377, 510438, 510441, C11D 304, C11D 3395
Patent
active
057734003
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to granular detergent compositions which contain a percarbonate bleach and which are formulated to provide not only good detergency and bleaching performance, but also improved storage stability and improved flowability and dispensing of the granules.
BACKGROUND OF THE INVENTION
The formulation of modem granular laundry detergents without the use of phosphate builders and under various constraints with respect to fabric safety and environmental effects is a substantial challenge. The formulator is faced with the need to provide detergent compositions which remove a wide variety of soils and stains from a wide variety of fabrics. Detergent compositions must function effectively over a wide range of wash temperatures. They must be storage-stable over a wide range of temperatures and humidities. Granular detergents should desirably be free-flowing and easily dispensed in automatic equipment. They must not suds too much nor too little. To be affordable, they must be formulated using economical, yet safe and effective, ingredients. Accordingly, there continues to be a substantial investment in the search for new and improved detergent compositions.
Inorganic bleaches such as percarbonate offer prospective advantages to the detergent formulator due to their inherent cleaning ability. Moreover, percarbonate bleaches offer prospective advantages over the commonly-used perborate bleach, inasmuch as they do not disadvantageously interact with important new surfactants such as the polyhydroxy fatty acid amides. In addition, there is now some indication that perborate bleach can sometimes undesirably complex with, and stabilize, "polyol" stains, such as the polyphenolic materials found in chocolate. Percarbonates do not suffer from this disadvantage. Moreover, if properly formulated, especially as disclosed herein, percarbonate can provide superior dispensing properties as compared with perborate. Unfortunately, percarbonates are not as stable as perborates; hence, their formulation in granular detergents can be problematic.
The present invention addresses the problems associated with the formulation of granular detergent compositions which contain percarbonate bleach and provides means for overcoming such problems. The present invention provides granular compositions with superior dispensing properties, superior fabric cleansing performance at both high and low washing temperatures (typically, 20.degree. C. to 90.degree. C.) and equal storage stability, as compared with granular compositions containing perborate bleach.
BACKGROUND ART
EP 451,893, U.S. Pat. No. 5,236,613, Japanese A4-227,693, Japanese 63-62442 and Japanese KOKOKU 61-16319 relate to percarbonate bleach.
SUMMARY OF THE INVENTION
The present invention encompasses granular detergent compositions (preferably nil-phosphate) with builder, surfactant and percarbonate bleach, characterized in that they comprise: group consisting of zeolite builders, carbonate builders, silicate builders, or mixtures thereof; mixtures of detersive surfactants; sulfate salt, said sulfate salt being contaminated with no more than 60 ppm iron and no more than 5 ppm copper; greater in said particle, from 0.3% to 15% by weight of a chelant; particles having an average particle size in the range from 500 micrometers to 1000 micrometers, not more than 10% by weight of said percarbonate being particles smaller than 200 micrometers and not more than 10% by weight of said particles being larger than 1250 micrometers; particles, said particles being dry-blended with particles (a) and (b), said sulfate particles being contaminated with no more than 40 ppm ion and no more than 5 ppm copper, said sulfate particles having an average particle size in the range from 250 micrometers to 1400 micrometers, not more than 25% by weight of said sulfate particles being larger than 1000 micrometers and not more than 2% of said particles being smaller than 250 micrometers; and
In order to achieve optimal stability of the percarbonate, particle (a) s
REFERENCES:
patent: 3963634 (1976-06-01), Tachibana et al.
patent: 3979318 (1976-09-01), Tokiwa et al.
patent: 3997692 (1976-12-01), Lamberti
patent: 4526698 (1985-07-01), Kuroda et al.
patent: 5454982 (1995-10-01), Murch et al.
Baillely Gerard Marcel
Hartshorn Richard Timothy
Dusheck Caroline L.
Lieberman Paul
Patel Ken K.
Rasser Jacobus C.
The Procter & Gamble & Company
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