Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Reexamination Certificate
1996-10-15
2003-05-06
Delcotto, Gregory (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
C510S305000, C510S306000, C510S309000, C510S311000, C510S313000, C510S320000, C510S374000, C510S375000, C510S376000, C510S441000
Reexamination Certificate
active
06559113
ABSTRACT:
This invention relates to detergent compositions containing a water-soluble builder and an enzyme, wherein a means is provided for delaying the release to the wash solution of said enzyme relative to the release of said water-soluble builder.
The satisfactory removal of enzyme sensitive soils/stains such as blood, egg, chocolate, gravy from soiled/stained substrates is a particular challenge to the formulator of a detergent composition for use in a washing method such as a laundry or machine dishwashing method.
Commonly, the removal of such soils/stains has been enabled by the use of enzyme components, proteolytic, amylolytic, lipolytic and cellulolytic enzymes.
The Applicants have now found that where a composition containing both a water-soluble builder and an enzyme is employed, and wherein a means is provided for delaying the release to a wash solution of the enzyme relative to the release of the water-soluble builder enhanced stain/soil removal may be obtained.
The Applicants have in addition found that stain/soil removal benefits may be obtained when a soiled substrate is pretreated with a solution containing a water-soluble builder, prior to being washed in a method using an enzyme containing detergent product.
It is therefore an object of the present invention to provide compositions suitable for use in laundry and machine dishwashing methods having enhanced stain removal.
It is a related object of the present invention to provide a stain/soil pretreatment method involving pretreating the soiled substrate with a solution containing a water-soluble builder, prior to washing with an enzyme containing detergent product.
SUMMARY OF THE INVENTION
According to the present invention there is provided a detergent composition containing
(a) a water-soluble builder; and
(b) an enzyme
wherein a means is provided for delaying the release to a wash solution of said enzyme relative to the release of said water-soluble builder such that in the T50 test method herein described the time to achieve a concentration that is 50% of the ultimate concentration of said water-soluble builder is less than 60 seconds and the time to achieve a concentration that is 50% of the ultimate concentration of said enzyme is more than 90 seconds.
According to another aspect of the present invention there is provided a washing method comprising the steps of:
(1) applying an enzyme-free solution of a composition containing a water-soluble builder to a soiled substrate;
(2) allowing said solution to remain in contact with said soiled substrate for an effective time interval;
(3) washing said soiled substrate using a washing method involving use of an enzyme-containing detergent composition.
Water-soluble Builder Compound
The detergent compositions of the present invention may contain a water-soluble builder compound, typically present at a level of from 1% to 80% by weight, preferably from 10% to 70% by weight, most preferably from 20% to 60% by weight of the composition.
Suitable water-soluble builder compounds include the water soluble monomeric polycarboxylates, or their acid forms, homo or copolymeric polycarboxylic acids or their salts in which the polycarboxylic acid comprises at least two carboxylic radicals separated from each other by not more that two carbon atoms, carbonates, bicarbonates, borates, phosphates, silicates and mixtures of any of the foregoing.
The carboxylate or polycarboxylate builder can be monomeric or oligomeric in type although monomeric polycarboxylates are generally preferred for reasons of cost and performance.
Suitable carboxylates containing one carboxy group include the water soluble salts of lactic acid, glycolic acid and ether derivatives thereof. Polycarboxylates containing two carboxy groups include the water-soluble salts of succinic acid, malonic acid, (ethylenedioxy) diacetic acid, maleic acid, diglycolic acid, tartaric acid, tartronic acid and fumaric acid, as well as the ether carboxylates and the sulfmyl carboxylates. Polycarboxylates containing three carboxy groups include, in particular, water-soluble citrates, aconitrates and citraconates as well as succinate derivatives such as the carboxymethyloxysuccinates described in British Patent No. 1,379,241, lactoxysuccinates described in British Patent No. 1,389,732, and aminosuccinates described in Netherlands Application 7205873, and the oxypolycarboxylate materials such as 2-oxa-1,1,3-propane tricarboxylates described in British Patent No. 1,387,447.
Polycarboxylates containing four carboxy groups include oxydisuccinates disclosed in British Patent No. 1,261,829, 1,1,2,2-ethane tetracarboxylates, 1,1,3,3-propane tetracarboxylates and 1,1,2,3-propane tetracarboxylates. Polycarboxylates containing sulfo substituents include the sulfosuccinate derivatives disclosed in British Patent Nos. 1,398,421 and 1,398,422 and in U.S. Pat. No. 3,936,448, and the sulfonated pyrolysed citrates described in British Patent. No. 1,439,000.
Alicyclic and heterocyclic polycarboxylates include cyclopentane-cis,cis,cis-tetracarboxylates, cyclopentadienide pentacarboxylates, 2,3,4,5-tetrahydrofuran-cis, cis, cis-tetracarboxylates, 2,5-tetrahydrofuran—cis—dicarboxylates, 2,2,5,5-tetrahydrofuran—tetracarboxylates, 1,2,3,4,5,6-hexane—hexacarboxylates and carboxymethyl derivatives of polyhydric alcohols such as sorbitol, mannitol and xylitol. Aromatic polycarboxylates include mellitic acid, pyromellitic acid and the phthalic acid derivatives disclosed in British Patent No. 1,425,343.
Of the above, the preferred polycarboxylates are hydroxycarboxylates containing up to three carboxy groups per molecule, more particularly citrates.
The parent acids of the monomeric or oligomeric polycarboxylate chelating agents or mixtures thereof with their salts, e.g. citric acid or citrate/citric acid mixtures are also contemplated as useful builder components.
Borate builders, as well as builders containing borate-forming materials that can produce borate under detergent storage or wash conditions can also be used but are not preferred at wash conditions less that about 50° C., especially less than about 40° C.
Examples of carbonate builders are the alkaline earth and alkali metal carbonates, including sodium carbonate and sesqui-carbonate and mixtures thereof with ultra-fine calcium carbonate as disclosed in German Patent Application No. 2,321,001 published on Nov. 15, 1973.
Specific examples of water-soluble phosphate builders are the alkali metal tripotyphosphates, sodium, potassium and ammonium pyrophosphate, sodium and potassium and ammonium pyrophosphate, sodium and potassium orthophosphate, sodium polymeta/phosphate in which the degree of polymerization ranges from about 6 to 21, and salts of phytic acid.
Suitable silicates include the water soluble sodium silicates with an SiO
2
:Na
2
O ratio of from 1.0 to 2.8, with ratios of from 1.6 to 2.4 being preferred, and 2.0 ratio being most preferred. The silicates may be in the form of either the anhydrous salt or a hydrated salt. Sodium silicate with an SiO
2
:Na
2
O ratio of 2.0 is the most preferred silicate.
Silicates are preferably present in the detergent compositions in accord with the invention at a level of from 5% to 50% by weight of the composition, more preferably from 10% to 40% by weight.
Enzyme
The detergent compositions contain an enzyme. Suitable enzymatic materials include the commercially available lipases, amylases, neutral and alkaline proteases, esterases, cellulases, pectinases, lactases and peroxidases conventionally incorporated into detergent compositions. Suitable enzymes are discussed in U.S. Pat. Nos. 3,519,570 and 3,533,139.
Preferred commercially available protease enzymes include those sold under the tradenames Alcalase, Savinase, Primase, Durazym, and Esperase by Novo Industries A/S (Denmark), those sold under the tradename Maxatase, Maxacal and Maxapem by Gist-Brocades, those sold by Genencor International, and those sold under the tradename Opticlean and Optimase by Solvay Enzymes. Protease enzyme may be incorporated into the compositions in accordance with the i
Jeffrey Janice
Park John Scott
Stoddart Barry
Corstanje Brahm J.
Delcotto Gregory
Glazer Julia A.
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