U.S. patent number 3,755,180 [Application Number 05/229,530] was granted by the patent office on 1973-08-28 for means to inhibit overglaze damage by automatic dishwashing detergents.
This patent grant is currently assigned to Colgate-Palmolive Company. Invention is credited to Amory Earl Austin.
United States Patent |
3,755,180 |
Austin |
August 28, 1973 |
MEANS TO INHIBIT OVERGLAZE DAMAGE BY AUTOMATIC DISHWASHING
DETERGENTS
Abstract
A cleaning composition particularly adapted for washing dishes,
glasses and silverware in mechanical devices such as automatic
dishwashers and capable of inhibiting overglaze attack, containing
as an essential ingredient, a precipitated silico-aluminate
compound.
Inventors: |
Austin; Amory Earl (Colonia,
NJ) |
Assignee: |
Colgate-Palmolive Company (New
York, NY)
|
Family
ID: |
22861637 |
Appl.
No.: |
05/229,530 |
Filed: |
February 25, 1972 |
Current U.S.
Class: |
510/227; 510/219;
510/438; 510/444; 510/508; 510/506; 8/108.1; 252/187.34;
252/179 |
Current CPC
Class: |
C11D
3/06 (20130101); C11D 3/128 (20130101); C11D
3/3958 (20130101); C11D 3/0073 (20130101) |
Current International
Class: |
C11D
3/12 (20060101); C11D 3/395 (20060101); C11D
3/02 (20060101); C11d 007/56 () |
Field of
Search: |
;252/99,95,135
;8/108 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Weinblatt; Mayer
Claims
What is claimed is:
1. A free-flowing, non-staining water-soluble alkaline detergent
composition capable of inhibiting overglaze attack consisting
essentially of about 40-95% by weight of at least one water-soluble
neutral to basic organic and/or inorganic builder salt, and at
least 4% by weight of a precipitated silico-aluminate compound
having a SiO.sub.2 content of 66-77%, an A1.sub.2 O.sub.3 content
of 9-13%, and a Na.sub.2 O content of 5-6% by weight.
2. A composition in accordance with claim 1 which also includes
about 0.5% by weight of a bleaching agent capable of liberating
hypohalite in aqueous media.
3. A composition in accordance with claim 1, which is in the form
of non-caking, granular product containing a plastic staining
colorant.
4. A composition in accordance with claim 1 wherein said builder
salt is sodium tripolyphosphate hexahydrate.
5. A composition in accordance with claim 1 which also includes
from about 0.5% to about 5% by weight of water-soluble organic
detergent selected from the group consisting of nonionic, cation,
amphoteric, anionic and zwitterionic detergent.
6. A composition in accordance with claim 5 wherein said detergent
is low-foaming nonionic detergent.
7. A composition in accordance with claim 6 wherein said detergent
is the product obtained by the condensation of about 3 moles of
propylene oxide with the condensation product of one mol of a
mixture of essentially straight chain C.sub.10 -C.sub.18 primary,
fatty alcohols with about 6 moles of ethylene oxide.
8. A method for treating glasses, dishes and like glazed surfaces
to remove foreign bodies from the surfaces thereof without
modifying the substrate comprising treating said substrate with a
dilute aqueous solution of the composition defined in claim 1.
9. A method of cleaning fine china and aluminum ware by washing
with an aqueous solution of the composition defined by claim 6.
10. A method of safely cleaning fine china and aluminum ware by
washing with an aqueous solution of the composition defined in
claim 3 without staining the plastic.
11. A method in accordance with claim 8, which also includes a
rinsing step.
12. A composition in accordance with claim 2 wherein said bleaching
agent is potassium dichloroisocyanurate.
Description
The present invention relates in general to cleaning compositions,
and in particular to the provision of cleaning compositions
beneficially adapted for use in connection with the cleaning of
substrates such as dishware and the like having a glazed
surface.
Many of the cleaning compositions heretofore recommended for use in
connection with the cleaning of substrates having a glazed surface
have been subject to one or more significant disadvantages. Perhaps
the paramount difficulty involved relates to the pronounced
tendency of such compositions to attack or otherwise deleteriously
affect substrates such as typified by glass, porcelain,
aluminumware and the like, thereby leading to impairment of such
articles. As will be recognized, aesthetic considerations, as well
as functional criteria, are of importance as regards the
suitability of a given cleaning composition, and especially when
comtemplated for use in connection with the cleaning of fine china
and the like having an ornamental or decorative surface. The
magnitude of the problems encountered can be readily appreciated in
view of the significant risk of economic loss entailed. Without
intending to be bound by any theory, it has nevertheless been
hypothesized in explanation of the overglaze attack phenomenon that
one or more of the ingredients present in the cleaning composition
exhibit a pronounced, if not intolerable, tendency to attack the
flux constituents present in the bonding material utilized in
securing the decorative or ornamental pattern to the substrate and
especially under the relatively severe alkaline conditions
necessarily extant in the cleaning solution during actual use.
In an effort to overcome or otherwise ameliorate the foregoing and
related difficulties, considerable research activity has been
necessary in the development of cleaning compositions specifically
and advantageously adapted to minimize the overglaze attack problem
and yet capable of providing the requisite measure of cleaning
activity. Thus, much of the methodology heretofore promulgated
involves as an essential expedient the use of one or more additives
which purportedly function as inhibitors under the conditions
normally encountered in cleaning. In this regard, a variety of such
inhibitor additives has been recommended by the prior art, such as
aluminum formate, aluminum acetate, alkali metal aluminum
orthophosphates, and alkali aluminate, zincate or berylliate.
Although providing relatively effective means whereby to enable
substantial alleviation of the overglaze attack problem, the
overall advantage realized is often marginal in view of concomitant
problems having as their genesis the objectionable tendency of the
cleaning composition, and more particularly the inhibitor compound,
to yield unsightly deposits or precipitates on the surface of the
substrate treated, not to mention the contacting surfaces of the
washing receptacle. As will be recognized, the fugitive behavior of
the inhibitor material may be such as to substantially vitiate any
advantage which might otherwise accrue from its use, thereby
detracting from commercial feasibility.
Another problem encountered in dishwasher products is the staining
of plastics resulting from the presence of colorants utilized as a
decorative additive in said products. Colorants have been added to
dishwasher products to render them more attractive to the buying
public, but are not intended to participate in the washing
operation. However, their presence has created a staining problem,
particularly of the plastic parts of the automatic dishwasher and
any other plastics present therein.
Still other difficulties encountered by dishwasher products is the
tendency of said granular products to cake in the package before
use and/or in the machine dispenser cup. Such caking reduces the
shelf-life of the product and concomitantly reduces its
efficacy.
Accordingly, it has now been discovered that the inclusion of a
qunatity of a precipitated silico-aluminate compound in the
detergent formulation surprisingly inhibits attack on the glaze on
china, prevents the staining of plastics, and inhibits caking of
the product, thereby enchancing its cleaning efficacy. While the
proportion of the silico-aluminate compound in a detergent
formulation may be varied, a desirable range is from about 4% to
10% by weight of the total formulation, a preferred range being
from approximately 4% by weight to approximately 9% by weight of
the total formulation.
Thus, a primary object of the present invention resides in the
provision of cleaning compositions substantially devoid of any
tendency to attack the glazed surface of a wide variety of
substrates.
Another object of the present invention resides in the provision of
free-flowing cleaning compositions capable of providing superior
cleaning activity.
Still another object is the provision of a colored, non-staining
dishwasher product.
Other objects and advantages of the present invention will become
more apparent hereinafter as the description proceeds.
In accordance with the present invention, a free-flowing,
non-staining, water-soluble alkaline detergent composition for
automatic dishwashing comprises a major amount of water-soluble
organic and/or inorganic builder salts, and a precipitated
silico-aluminate compound as a protector against overglaze attack
and plastic staining.
The silico-aluminate compound contemplated for use in the present
invention is a precipitated hydrated chemical compound having a
SiO.sub.2 content of 66-77%, an A1.sub.2 O.sub.3 content of 9-13%,
and a Na.sub.2 O content of 5-6% by weight. The preferred
silico-aluminate compound is Zeolex, a commercial product available
from the J.M.Huber Corporation of New York City, N.Y. This product
is in the form of a powder which is the preferred form because of
the ease with which it can be formulated into a dishwasher
detergent, although any finely divided, precipitated
silico-aluminate may be utilized herein. Zeolex 23A and 35A have
specific gravities of 2.1 and 2.3, respectively, a 20% aqueous
solution thereof exhibit a pH of 9-11, are known anti-caking
agents, have good water-adsorptive properties (can adsorb moisture
up to 75% of their weight, yet remain free-flowing) and will
readily adsorb oily products. However, its overglaze protective
properties in a dishwasher product are unique and totaly
unexpected, amounts as low as 4% by weight of the total composition
being effective in inhibiting overglaze attack. In addition to
overglaze protection, Zeolex is an effective anti-staining agent,
as evidenced by the plastic-staining tests wherein no staining is
evidenced by the colored materials normally found in dishwasher
products. The Zeolex has also been found to be an effective
inhibitor of aluminum discoloration during the cleaning process.
Still another attribute of dishwasher products containing Zeolex is
the ability to retain both the fluidity with no evidence of caking
and its stability with no detectable aroma, even after 4 weeks of
rapid aging at room temperature, 100.degree.F and 120.degree.F.
This long shelf-life renders it particularly attractive
commercially. It has also been found that Zeolex-containing
products aid in softening the water by removing the calcium and
magnesium ions from the water, thereby inhibiting unsightly
precipitation onto the surfaces of the washed tableware.
The water-soluble builder salts utilized in the instant detergent
composition comprises one or more inorganic and/or organic basic
and neutral water-soluble salts. The builder salts are employed in
amounts ranging up to about 95%, i.e., 40-95% by weight, with a
range of from about 60% to about 90% by weight of the composition
being preferred. Suitable inorganic builders include, without
necessary limitation, trisodium phosphate, tetrasodium
pyrophosphate, sodium acid pyrophosphate, sodium tripolyphosphate
hexahydrate, sodium monobasic phosphate, sodium dibasic phosphate,
sodium hexameta phosphate, sodium silicates, SiO.sub.2 /Na.sub.2 O
of 1/1 to 3.2/1, e.g. (sodium metasilicate), sodium carbonate,
sodium sulfate, borax, etc. Other alkali metal salts such as
potassium and lithium; ammonium and substituted ammonium salts such
as methylammonium, diethanolammonium and triethanolamine; and amine
salts such as mono-, di-, and triethanolamine, methylamine,
octylamino, diethylenetriamine, triethylenetetramine and
ethylenediamine are efficacious. Suitable organic builders include
salts of organic acids, and, in particular, the water-soluble salts
of aminopolycarboxylic acids and hydroxycarboxylic acids. The acid
portion of the salt can be derived from acids such as
nitrilodiacetic; N-(2-hydroxyethyl) nitrilodiacetic acid,
nitrilotriacetic acid (NTA), ethylenediamine tetracetic acid,
(EDTA); N-(2-hydroxyethyl) ethylenediamine triacetic acid;
2-hydroxyethyl iminodiacetic acid; 1,2-diaminocyclohexanediacetic
acid; diethylenetriamine penta-acetic acid, citric acid, and the
like. The builder salt is preferably employed in amounts sufficient
to yield a pH in water of from 9.5 to 12, preferably from 10 to 11,
in order to obtain optimum detergency performance.
The cleaning compositions described herein may further be provided
with one or more bleaching agents, which may, in general, be
defined as encompassing compounds capable of liberating a
hypohalite such as hypochlorite chlorine and/or hypobromite bromine
on contact with aqueous media. Particular examples of bleaching
agents include the dry, particulate heterocyclic N-bromo and
N-chloro imides such as trichloro-cyanuric, tribromocyanuric acid,
dibromo- and dichlorocyanuric acid, the salts thereof with
water-solubilizing cations such as potassium and sodium and
mixtures thereof. Particular compounds found useful are potassium
dichloroisocyanurate and trichloroisocyanuric acids.
Other N-bromo and N-chloro imides may also be used, such as
N-brominated and N-chlorinated succinimide, malonimide phthalimide
and naphthalimide. Other compounds include the hydantoins, such as
1,3-dibromo and 1,3-dichloro-5,5-dimethylhydantoin;
N-monochloro-5,5-dimethylhydantoin, methylene-bis
(N-bromo-5,5-dimethylhydantoin); 1,3-dichloro,5
,methyl-5-N-amylhydantoin, and the like. Other useful hypohalite
liberating agents comprise tribromomelamine and trichloromelamine.
Dry, particulate, water-soluble anhydrous inorganic salts are
likewise suitable for use such as lithium hypochlorite and
hypobromite. The hypohalite-liberating agent may, if desired, be
provided in the form of a stable, solid complex or hydrate, such as
sodium p-toluene-sulfobromamine-trihydrate, sodium
benzene-sulfo-chloramine-dihydrate, calcium hypobromite
tetrahydrate, calcium hypochlorite tetrahydrate, etc. Brominated
and chlorinated trisodium phosphate formed by the reaction of the
corresponding sodium hypohalite solution with trisodium phosphate
(and water as necessary) likewise comprise efficacious materials.
The present invention contemplates, as an additional embodiment,
the use of bleaching agents capable of liberating hypochlorite as
well as hypobromite such as, for example, the N-brominated,
N'-chlorinated heterocyclic imides, as, for example, the N-bromo,
N'-chlorocyanuric acids and salts thereof, e.g., N-monobromo-N,
N-dichloro-cyanuric acid, N-mono-bromo-N-monochlorocyanuric acid,
sodium N-monobromo-N-monochlorocyanurate,
potassium-N-monobromo-N-monochlorocyanurate; and the N-brominated,
N-chlorinated hydantoins, e.g.,
N-bromo-N-chloro-5,5-dimethylhydantoin and
N-bromo-N-chloro-5-ethyl-5-methyl hydantoin.
The hypohalite-liberating compound is employed in an amount of from
0.5 to 5% by weight of the composition, and preferably in an amount
of from about 0.5 to 3% by weight thereof. In any event, the
hypohalide material should preferably be employed in amounts
sufficient to yield from about 0.5-3% available chlorine, bromine,
etc. in order to assure optimum results.
In general, efficacious cleaning compositions may be formulated in
accordance with the present invention by the use of a precipitated
silico-aluminate compound in amounts of about 4 to 10% by weight of
total composition and up to about 95%, i.e., from 40% to 95% by
weight of at least one compound selected from the group of
water-soluble organic detergent, water-soluble inorganic or organic
neutral or alkaline builder salt, bleaching agent capable of
liberating hypohalite on contact with aqueous media and caustic
alkali. The bleaching agent is essential to the implementation of
those embodiments of the present invention directed to industrial
bottle cleaning compositions.
Water-soluble organic detergents, i.e., surface-active components,
may be employed, such materials being well known in the prior art,
the term detergent comprehending species of the anionic, cationic,
amphoteric and zwitterionic types. In formulating an automatic
dishwasher product, it is preferred to utilize a low foaming
detergent such as the non-ionics.
Non-ionic surface-active agents include those surface-active or
detergent compounds which contain an organic hydrophobic group and
a hydrophilic group which is a reaction product of a solubilizing
group such as carboxylate, hydroxyl, amido or amino with ethylene
oxide or with the polyhydration product thereof polyethylene
glycol.
As examples of nonionic surface-active agents which may be used,
there may be noted the consideration products of alkyl phenols with
ethylene oxide, e.g., the reaction product of isooctyl phenol with
about six to 30 ethylene oxide units; condensation products of
alkyl thiophenols with 10 to 15 ethylene oxide units; condensation
products of higher fatty alcholols of monoesters of hexahydric
alcohols and inner ethers thereof such as sorbitan monolaurate,
sorbitol mono-oleate and mannitan monopalmitate, and the
condensation products of polypropylene glycol with ethylene
oxide.
Further suitable detergents are polyoxyalkene esters of organic
acids, such as the higher fatty acids, rosin acids, tall oil, or
acids from the oxidation of petroleum, and the like. The polyglycol
esters will usually contain from about 8 to about 30 moles of
ethylene oxide or its equivalent, and about 8 to 22 carbon atoms in
the acyl group. Suitable products are refined tall oil condensed
with 16 to 20 ethylene oxide groups, or similar polyglycol esters
of lauric, stearic, oleic and like acids.
Additional suitable non-ionic detergents are the polyalkylene oxide
condensates with higher fatty acid amides, such as the higher fatty
acid primary amides and higher fatty acid mono- and fatty Suitable
agents are coconut fatty acid amide condensed with about 10 to 30
moles of ethylene oxide. The fatty acyl group will similarly have
about eight to 22 carbon atoms, and usually about 10 to 18 carbon
atoms in each product. The corresponding sulphonamies may also be
used, if desired.
Other suitable polyether non-ionic detergents are the polyalkylene
oxide ethers of higher aliphatic alcohols. Suitable alcohols are
those having a hydrophobic character, and preferably eight to 22
carbon atoms. Examples thereof are iso-octyl, nonyl, decyl,
dodecyl, tridecyl, tetradecyl, hexadecyl, octadecyl and oleyl
alcohols, which may be condensed with an appropriate amount of
ethylene oxide, such as at least about 6, and preferably about
10-30 moles. A typical product is tridecyl alcohol, produced by the
Oxo process, condensed with about 12, 15 or 20 moles of ethylene
oxide. The corresponding higher alkyl mercaptans or thioalcohols
condensed with ehtylene oxide are also suitable for use in
compositions of the present invention.
Examples of other suitable wetting agents include low-foaming
anionic materials such as dodecyl hydrogen phosphate, methyl
naphthalene sulfonate, sodium 2-acetamido-hexadecane-1-sulfonate,
and mixtures thereof. Mixtures of the foregoing wetting agents may
also be employed, and, if desired foam-reducing additive may be
added as appropriate to minimize undesirable foaming tendencies of
these wetting agents under conditions of use.
The detergent material is employed in concentrations ranging from
about 0.5% to about 5% by weight of total composition, with a range
of 1% to 3% being particularly preferred.
This, a relatively minor amount of nonionic type detergent, that
is, about 2-4%, is especially beneficial inasmuch as it acts as a
foam depressent as well as a detersive agent in an automatic
dishwashing solution.
Minor amounts of other additives which do not interfere with the
cleaning, anti-corrosive, and overglaze protection properties of
instant composition may be added such as pigments, dyes, perfume,
fillers, extenders, suds builders, suds depressors,
anti-redeposition agents, etc. In some instances it may be
commercially feasible to add said ingredients to render them more
attractive to the consumer. It has been found that the plastic
staining problem encountered with the use of colorants is
successfully negotiated by the presence of the precipitated
silica-aluminate compound, as utilized in instant invention.
The following examples are given for purposes of illustration only,
and are not to be considered as necessarily constituting a
limitation on the present invention. All parts and percentages
given are by weight unless otherwise indicated. For purposes of
ascertaining the capacity of the various compositions exemplified
to ameliorate overglaze attack on fine china samples, the method of
the Chemical Specialities Manufacturers Association (CSMA) is
employed, such method being described in detail in "Soap and
Chemical Specialties", 33, (9), 60, 1957. Such test is designed as
an accelerated dishwasher exposure method; thus, the comparative
removal of overglaze decoration provides direct means for affording
an evaluation of the corrosiveness of dishwashing detergent
solutions. According to such method, samples of standard plates
(Greenwood pattern), Onondaga Pottery Company, Syracuse, N.Y., are
immersed in deionized or distilled water maintained at a
temperature of 211.degree.F. and containing the indicated percent
concentration of detergent for periods of 2, 4, and 6 hours. The
test samples are thereafter removed, hand-rubbed with cloth and
compared with untreated samples of the same standard plate. The
treated samples are visually scrutinized to determine the extent of
overglaze damage with numerical indicie being assigned to indicate
the extent of overglaze damage involved. Thus, the scale of 0, 1,
2, 3 and 4 correspond, in terms of damage, to none, slight,
moderate, considerable, and complete, respectively.
EXAMPLE 1
This example illustrates the applicability of the present invention
to the preparation and use of cleaning compositions specifically
adapted for use in connection with dishwashing operations. The
following composition is prepared by dry-blending the specified
ingredients to form a dry, non-caking, particulate composition.
Ingredients % Sodium tripolyphosphate hexahydrate 41.098 Sodium
tripolyphosphate anhydrous 10.870 Sodium metasilicate, anhydrous
9.000 Sodium chloride 24.868 Non-ionic detergent* 2.000 Sodium acid
aluminum phosphate 1.000 Color solution 0.228 Perfume 0.150
Potassium dichloroisocyanurate 3.000 Zeolex 23A** 5.000 Boric oxide
1.000 Boric acid 1.786 *The non-ionic detergent is the product
obtained by the condensation of about three mole of propylene oxide
with the condensation product of one mol of a mixture of
essentially straight chain, primary, fatty alcohols in the C.sub.10
-C.sub.18 range with about six mols of ethylene oxide. **Zeolex is
a precipitated sodium silico-aluminate available from the Huber
Corporation, having the following physical characteristi cs: Zeolex
23A 35A Heating Loss, 2 hours at 105.degree.C (max.) % as packed
8.0 8.0 pH (20 gms Zeolex/80 ml water) 9.5-10.5 9.0-10.0 Bulk
density, packed, lbs/cu.ft. 16-18 31-37 Density, 25.degree.C,
gms/ml 2.1 2.3 Form Powder Powder G.E.Brightness, % reflectance
91-93 91-93 Mean particle diameter, millimicrons 40 72 Oil
adsorption, cc oil/100 gms 105-125 60-80 Refractive index 1.55 1.55
Surface areas, B.E.T. M.sup.2 /gm 70 35
Overglaze damage evaluated according to the CSMA method, uitlizing
a 0.3% aqueous solution of the above composition is 1 with no
evidence of plastic staining. Compositions without the Zeolex
exhibit plastic staining. Another advantage noted with the use of
Zeolex is the total lack of aluminum discoloration, a problem
encountered with cleaning of aluminum untensils. An 0.15% aqueous
solution has a pH of 10.2 and a CSMA rating of 1.
EXAMPLE 2
Example 1 is repeated, except that Zeolex 35A was substituted for
23A, yielding the same beneficial results.
EXAMPLE 3
Example 1 is repeated, except that the Zeolex content is increased
to 7.5%, the sodium aluminum phosphate is omitted, and the sodium
chloride is reduced to 23.368%. An 0.15% aqueous solution thereof
has a pH of 9.9 and a CSMA rating of 1, and is non-staining.
EXAMPLE 4
Example 3 is repeated, except that the Zeolex content is increased
to 9% and the sodium chloride content is reduced to 21.868%. An
0.15% aqueous solution thereof has a pH of 10.1 and a CSMA rating
of 1, and is non-staining.
EXAMPLE 5
Example 1 is repeated, but the sodium aluminum phosphate and the
boric oxide and boric acid are omitted, and the sodium chloride
content adjusted accordingly. An 0.15% aqueous solution has a pH of
11.3 and a CMSA rating of 2. There is no evidence of plastic
staining.
EXAMPLE 6
Example 1 is repeated, but the boric oxide and boric acid are
omitted and the sodium chloride content adjusted accordingly. An
0.15% aqueous solution thereof exhibits a pH value of 11.1 and a
CSMA rating of 1. No staining is evident.
EXAMPLE 7
Example 1 is repeated, but the sodium acid aluminum phosphate is
omitted and the sodium chloride content adjusted accordingly. An
0.15% aqueous solution thereof has a pH value of 10.5 and a CSMA
rating of 1 and stain-free.
A 0.15% aqueous solution of the control product, which contained 3%
sodium acid aluminum phosphate and 2% talc (magnesium silicate),
but no Zeolx, has a pH value of 10.0 and a CSMA rating of 2. Thus,
it is apparent that, by replacing the talc and part or all of the
sodium acid aluminum phosphate with a silico-aluminate compound,
such as Zeolex, superior overglaze protection is obtainable, as
well as a stain-free composition. Use of Zeolex eliminated aluminum
discoloration, a problem encountered in the cleaning of aluminum
untensils. An 0.15% aqueous solution has a pH of 10.2 and a CSMA
rating of 1.
EXAMPLE 8
Ingredients % Sodium tripolyphosphate hexahydrate 59.850 Sodium
metasilicate, anhydrous 20.000 Boric oxide 1.000 Boric acid 1.786
Zeolex 23A 4.000 Sodium sulfate 3.214 Potassium
dichloroisocyanurate 1.600 Yellow dots 3.000 Green dots 1.500 Talc
(magnesium silicate) 2.000 Non-ionic of Example 1 1.460 Perfume
solution 0.590
EXAMPLE 9
Example 8 is repeated, except that the talc is omitted and the
sodium sulfate is increased to 5.214%.
EXAMPLE 10
Ingredients % Sodium tripolyphosphate hexahydrate 41.096 Sodium
tripolyphosphate anhydrous 10.870 Hydrous silicate (55.7%
SiO.sub.2) 7.513 Sodium chloride 21.685 Potassium
dichloroisocyanurate 3.000 Zeolex 23A 5.000 Boric oxide 1.000 Boric
acid 1.786 Color 4.600 Non-ionic of Example 1 3.000 Perfume 0.150
Water 0.300
EXAMPLE 11
Ingredients % Sodium citrate 2H.sub.2 O 30 Tetrasodium ethylenedi
aminetetra acetate 5.0 Silicated soda ash 40.0 Potassium
dichloroisocyanurate 2.0 Non-ionic of Example 1 2.0 Sodium sulfate
11.0 Zeolex 35A 5.0 Sodium carbonate 5.0
All of the aforedefined products afforded superior overglaze
protection to china during the washing cycle than products having
no Zeolex, are non-caking and stable for a protracted period of
time, and materials staining of the plastic parts of the dishwasher
and/or other plastics bleaching therein.
Effective industrial bottle cleaning compositions may be provided
in accordance with the present invention by merely admixing with
caustic alkali whereby to provide a highly alkaline composition,
preferably having a pH of about 12. Such compositions may be
readily formulated in accordance with the parameters hereinbefore
described.
Results similar to those described in the foregoing examples are
obtained when the procedures delineated therein are repeated, but
employing, in lieu of the specific non-ionic detergent identified,
a variety of materilas selected from non-ionic, anionic, cationic,
amphoteric and zwitterionic types. Moreover, various belaching
agents hereinbefore recommended for such purposes may be readily
employed to advantage.
While the detergent composition of the present invention finds most
efficacious utilization in connection with the washing of the
dishes and the like in automatic dishwashers, naturally the
detergent may be utilized in other fashions as desired. Usually,
however, the best mode of use will be in connection with automatic
dishwashers which have the ability of dispensing the detergent of
the present invention in one or more separate wash cycles.
Accordingly, the detergent compositions of the present invention is
added to the two receptacles, if such are present, in an automatic
dishwasher. When the dishwasher is set into operation, after the
dishes have been suitably positioned therein, the automatic devices
of the dishwashers permit the addition of sufficient water to
produce a concentration of the detergent composition of
approximately 0.30 to 0.5% by weight. The operation of the
dishwasher results in treating, that is, washing of the dishes with
the aqueous solution of the detergent composition. Usually, the
sequence of operation in utilizing an automatic dishwasher results
in one or more rinsing steps following the one or more washing
cycles. In utilizing the detergent composition of the present
invention, it will be noted that, even after use in considerable
number of washings, there will be little or no attack on the
overglaze on china or little or no attack on aluminum ware as a
result of the use of the detergent composition.
Similarly, any dishwasher detergent may be utilized in accordance
with this invention by including a precipitated silico-aluminate
compound in its formulation.
It will be apparent that many changes and modifications of the
several features described herein may be made without departing
from the spirit and scope of the invention. It is therefore
apparent that the foregoing description is by way of illustration
of the invention, rather than limitation of the invention.
* * * * *