Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Patent
1997-02-28
1998-06-30
Hertzog, Ardith
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
510302, 510309, 510313, 510315, 510318, 510434, 510476, 510507, C11D 337, C11D 312, C11D 339, C11D 3395
Patent
active
057734011
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a detergent composition comprising a specific polycarboxylate agent having excellent builder capacity for divalent alkali earth metals, which provides excellent clay soil removal and dispersion in laundering conditions.
BACKGROUND OF THE INVENTION
Polycarboxylates are commonly used in laundry detergent products and are well-known to provide soil dispersion, and calcium and magnesium hardness sequestration. Such polymers are can be polymerized carboxylic monomer, or salts thereof, such as polyacrylate and co-polymers of mono- or poly-carboxylic monomers, and salts thereof, such as those described in Japanese Patent Laid-Open No. 4510 (1977), issued to Nippon Shokubai KK, disclosing copolymers having a molecular weight between 300 and 10,000, Japanese Patent Publication No. 11789 (1969), Japanese Patent Publication No. 411791 (1969), U.S. Pat. No. 3,308,007 (Diehl, et al), issued Mar. 7, 1967, and EP Publication 0,080,222 (Procter & Gamble Company), Jun. 1, 1983), the disclosures of which are incorporated herein by reference.
However, the performance of such polycarboxylate polymers are not completely satisfactory. Known polycarboxylate agents which provide excellent clay soil dispersion have not been shown to also provide sufficient calcium or hardness binding capacity, especially in underbuilt wash conditions. By "underbuilt" is meant that there is insufficient calcium and magnesium sequestration capacity in the laundry detergent composition for the total amount of calcium and magnesium ions brought into the wash solution as wash water and from soils in the clothes to be laundered. Conversely, known polycarboxylate agents which provide excellent calcium and magnesium ion binding capacity have not been shown to also provide effective clay soil dispersion capability. Therefore, there remains a need for a laundering agent which can provide both excellent binding capacity for hardness ions and clay soil dispersion.
It has been discovered that the binding capacity and dispersion capability of polycarboxylate agents in the laundering process can be predicted by evaluation of the individual features of binding capacity and clay soil dispersion of the agent. It has further been discovered that polycarboxylate agents which exhibit a high clay soil dispersion capability and a high hardness binding capacity will provide excellent sequestration and soil dispersion performance under regular wash conditions. It has also been discovered that such polycarboxylate agents provide such clay soil dispersion capability even in underbuilt laundering conditions.
DETAILED DESCRIPTION OF THE INVENTION
The present invention includes laundry detergent composition comprising: comprising a polycarboxylate agent having an Index Ratio (IR) of not less than 100, wherein IR=Binding Index (BI).times.Dispersing Index (DI)/100. The Binding Index and the Dispersing Index of any particular polycarboxylate agent are determined in accordance with the test methods described hereinafter. In general, the higher the Index Ratio, the better the performance of the polymer under laundering conditions, especially in underbuilt conditions. Preferably the Index Ratio is not less than 110, more preferably not less than 120. Likewise, the Binding Index and the Dispersion Index are, independently, not less than 110, more preferably not less than 120.
Particularly preferred are copolymers of maleic acid and acrylic acid, and salts thereof Such polymers generally have the formula the mole ratio R of x to y is from about 3:7 to 7:3, and where M is a counterion, preferably Na or K. Most preferably, the copolymer has a molecular weight between 6,000 and 12,000, and R is from 1:1 to 7:3.
The polycarboxylate agents can be made by methods well known in the art. Such methods are described in, for example, Japanese Patent Laid-Open No. 4510 (1977), issued to Nippon Shokubai KK.
The detergent surfactant of the present invention is selected from anionic surfactant, nonionic surfactant, cationic surfactant, a
REFERENCES:
English translation of JP 52-4510, published Jan. 13, 1977, Jul. 1995.
J5 2004-510; Nippon Shokubai Kag; Detergent Compsns.-Which Do Not Cause River Pollution; Jun. 3, 1975; 13817Y08, for JP 52-4510, Jan. 13, 1977.
Kitko David Johnathan
Murata Susumu
Shigematsu Toshiko
Hertzog Ardith
Patel Ken K.
Rasser Jacobus C.
The Procter & Gamble & Company
Zerby Kim W.
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