Automatic dishwashing cleaning system

Details Automatic dishwashing cleaning system Automatic dishwashing cleaning system

2000-10-13

2001-05-08

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...

C510S221000, C510S223000, C510S224000, C510S230000, C510S372000, C510S438000

Reexamination Certificate

active

06228825

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a non-aqueous liquid automatic dishwashing composition disposed in a water soluble package that can be added directly into an automatic dishwasher.
BACKGROUND OF THE INVENTION
U.S. Pat. Nos.: 5,053,158; 5,064,553; 5,202,046; 5,209,863; 5,225,096; 5,229,027; 5,232,021; 5,252,241; 5,252,242; 5,298,180; 5,368,766 and 5,423,997 relate to an aqueous gel automatic dishwashing composition. The use of these compositions are burdensome and difficult to obtain precise dosing.
U.S. Pat. Nos. 5,164,106 and 5,169,553 relate to non-aqueous liquid automatic dishwashing compositions which contain chlorine. These compositions are inconvenient to use because of dosing problems, and settling problems of the builder in the composition.
SUMMARY OF THE INVENTION
The present invention relates to an automatic dishwashing cleaning system comprising:
(a) a water soluble container; and
(b) a non-aqueous liquid automatic dishwashing composition disposed in said water soluble container.
An object of the present invention is to provide a non-aqueous automatic dishwashing composition disposed in a water soluble container, wherein the system containing the non-aqueous liquid automatic dishwashing composition and container can be placed directly into an automatic dishwasher.
DETAILED DESCRIPTION OF THE INVENTION
The present invention relates to an automatic dishwashing cleaning package which is a system comprising:
(a) a water soluble container; and
(b) a non-aqueous liquid automatic dishwashing composition disposed in said water soluble container, wherein said non-aqueous liquid automatic dishwashing composition comprises approximately by weight:
(i) 30% to 50%, more preferably 35% to 45% of a first polyethylene glycol having a molecular weight of about 200 to about 1,200;
(ii) 0.1% to 5%, more preferably 0.5% to 4% of a second polyethylene glycol having a molecular weight of about 2,000 to about 6,000;
(iii) 20% to 30%, more preferably 22% to 30% of at least on alkali metal phosphate detergent builder salt;
(iv) 0.5% to 10%, more preferably 1% to 8% of a nonionic surfactant;
(v) 4% to 16%, more preferably 6% to 12% of a silicate compound;
(vi) 0 to 20%, more preferably 0.5% to 12% of a peroxygen bleaching agent;
(vii) 1% to 20%, more preferably 5% to 15% of an alkali metal nonphosphate detergent builder salt;
(viii) 0 to 10%, most preferably 0.1% to 8%, more preferably 0.5% to 8% of a mixture of a protease enzyme and an amylase enzyme in a weight ratio of protease enzyme to amylase enzyme of 10:1 to 1:10, more preferably 2:1 to 1:2;
(ix) 0 to 5%, more preferably 0.1% to 4% of a bleach activator; and
(x) 0.5% to 8%, more preferably 1% to 6% of an antiredeposition agent.
Excluded from the instant compositions are anionic surfactants, fatty acid or alkali metal salts of fatty acid, chlorine bleach compounds crosslinked polyacrylate polymers and more than 10 wt. % of water.
The mixture of the polyethylene glycol having a molecular weight of about 200 to about 1,200, more preferably about 200 to about 800 and the polyethylene glycol having a molecular weight of about 2,000 to 6,000, more preferably about 2,600 to about 4,000 is a thickener for the nonaqueous liquid dishwashing composition. The mixture of the two polyethylene glycols thickens the system thereby permitting adequate suspension of the silicate compound and the alkali metal detergent builder salts.
The nonionic surfactants that can be used in the present nonaqueous liquid automatic dishwasher detergent compositions are generally described as ethoxylated/propoxylated fatty alcohols which are low-foaming surfactants and may be possibly capped, characterized by the presence of an organic hydrophobic group and an organic hydrophilic group and are typically produced by the condensation of an organic aliphatic or alkyl aromatic hydrophobic compound with ethylene oxide and/or propylene oxide (hydrophilic in nature). Practically any hydrophobic compound having a carboxy, hydroxy, amide or amino group with a free hydrogen attached to the oxygen or the nitrogen can be condensed with ethylene oxide or propylene oxide or with the polyhydration product thereof, polyethylene glycol, to form a nonionic detergent. The length of the hydrophilic or polyoxyethylene chain can be readily adjusted to achieve the desired balance between the hydrophobic and hydrophilic groups. Typical suitable nonionic surfactants are those disclosed in U.S. Pat. Nos. 4,316,812 and 3,630,929.
Preferably, the nonionic surfactants that are used are the low-foaming polyalkoxylated lipophiles wherein the desired hydrophile-lipophile balance is obtained from addition of hydrophilic poly-lower alkoxy group to a lipophilic moiety. A preferred class of the nonionic detergent employed is the poly-lower alkyoxylated higher alkanol wherein the alkanol is of 9 to 18 carbon atoms and wherein the number of moles of lower alkylene oxide (of 2 or 3 carbon atoms) is from 3 to 15. Of such materials, it is preferred to employ those wherein the higher alkanol is a high fatty alcohol of 9 to 11 or 12 to 15 carbon atoms and which contain from 5 to 15 or 6 to 16 lower alkoxy groups per mole. Preferably, the lower alkoxy is ethoxy but in some instances, it may be desirably mixed with propoxy, the latter, if present, usually being major (more than 50%) portion. Exemplary of such compounds are those wherein the alkanol is of 12 to 15 carbon atom and which contain about 7 ethylene oxide groups per mold.
Useful nonionics are represented by the low foam Plurafac series from BASF Chemical Company which are the reaction product of a higher linear alcohol and a mixture of ethylene and a propylene oxides, containing a mixed chain of ethylene oxide and propylene oxide, terminated by a hydroxyl group. Examples include Product A (a C
12
-C
15
fatty alcohol condensed with 6 moles ethylene oxide and 3 moles propylene oxide). Product B (a C
12
-C
15
fatty alcohol condensed with 7 mole propylene oxide and 4 mole ethylene oxide), and Product C (a C
12
-C
15
fatty alcohol condensed with 5 moles propylene oxide and 10 moles ethylene oxide). Another group of liquid nonionics are available from Shell Chemical Company, Inc. under the Dobanol trademark: Dobanol 91-5 is a low foam ethoxylated C
2
-C
11
fatty alcohol with an average of 5 moles ethylene oxide and Dobanol 25-7 is an ethoxylated C
12
-C
15
fatty alcohol with an average of 7 moles ethylene oxide. Another liquid nonionic surfactant that can be used is sold under the tradename Lutensol SC 9713.
Plurafac nonionic surfactants from BASF are biodegradable, low-foaming surfactant which are specially preferred for the instant automatic dishwashing compositions. Plurafac™ SLF18 which is water dispensible and has a low surface tension and low cloud and is low foaming is especially preferred for use in the instant automatic dishwashing compositions.
Other useful surfactants are Neodol 25-7 and Neodol 23-6.5, which products are made by Shell Chemical Company, Inc. The former is a condensation product of a mixture of higher fatty alcohols averaging about 12 to 13 carbon atoms and the number of ethylene oxide groups present averages about 6.5. The higher alcohols are primary alkanols. Other examples of such detergents include Tergitol 15-S-7 and Tergitol 15-S-9 (registered trademarks), both of which are linear secondary alcohol ethoxylates made by Union Carbide Corp. The former is mixed ethoxylation product of 11 to 15 carbon atoms linear secondary alkanol with seven moles of ethylene oxide and the latter is a similar product but with nine moles of ethylene oxide being reacted.
The alkali metal phosphate detergent builder salts used in the instant composition include the polyphosphates, such as alkali metal pyrophosphate, alkali metal tripolyphosphate, alkali metal metaphosphate, and the like, for example, sodium or potassium tripolyphosphate (hydrated or anhydrous), tetrasodium or tetrapotassium pyrophosphate, sodium or potassium hexa-metaphosphate, trisodium or tripotassium orthophosphate and the like. Sodium tripolyphosphate

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