U.S. patent application number 11/130327 was filed with the patent office on 2005-12-29 for photo bleach compositions.
Invention is credited to Gartstein, Vladimir, Harriman, Anthony, Jeffreys, Brian, Willey, Alan David.
Application Number | 20050288200 11/130327 |
Document ID | / |
Family ID | 34972863 |
Filed Date | 2005-12-29 |
United States Patent
Application |
20050288200 |
Kind Code |
A1 |
Willey, Alan David ; et
al. |
December 29, 2005 |
Photo Bleach Compositions
Abstract
The present invention relates to compositions comprising a
photosensitizer that can be used to provide aqueous fluids with
bleaching capabilities, aqueous fluid photobleaching compositions
having bleaching capabilities and processes of making and using
same. Such compositions can provide bleaching and/or cleaning
benefits that are similar to or better than hydrogen peroxide
bleaching systems.
Inventors: |
Willey, Alan David;
(Cincinnati, OH) ; Jeffreys, Brian; (Grimbergen,
BE) ; Harriman, Anthony; (Vidauban, FR) ;
Gartstein, Vladimir; (Cincinnati, OH) |
Correspondence
Address: |
THE PROCTER & GAMBLE COMPANY
INTELLECTUAL PROPERTY DIVISION
WINTON HILL TECHNICAL CENTER - BOX 161
6110 CENTER HILL AVENUE
CINCINNATI
OH
45224
US
|
Family ID: |
34972863 |
Appl. No.: |
11/130327 |
Filed: |
May 16, 2005 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
60582705 |
Jun 24, 2004 |
|
|
|
Current U.S.
Class: |
510/267 |
Current CPC
Class: |
D06L 4/12 20170101; D06L
4/50 20170101; C11D 3/0063 20130101; C11D 11/0017 20130101; C11D
3/40 20130101; C11D 3/42 20130101 |
Class at
Publication: |
510/267 |
International
Class: |
C23G 001/06 |
Claims
What is claimed is:
1. A photobleaching composition comprising, based on total weight
of said composition: a.) from about 0.1% to about 50% of a
water-soluble photosensitizer; b.) from about 1% to about 99.9% of
an extender; and c.) any balance of said photobleaching composition
being a material selected from an aqueous fluid, an adjunct
ingredient or mixture thereof.
2. A photobleaching composition according to claim 1 comprising:
a.) from about 1% to about 25% of a water-soluble photosensitizer;
b.) from about 5% to about 90% of an extender.
3. A photobleaching composition according to claim 2 comprising a.)
from about 5% to about 20% of a water-soluble photosensitizer; b.)
from about 10% to about 50% of an extender.
4. A photobleaching composition according to claim 1 wherein said
extender comprises a surfactant.
5. A photobleaching composition according to claim 1 wherein: a.)
said water-soluble photosensitizer is selected from the group
consisting porphyrins, phthalocyanines, C.sub.8-C.sub.70 aromatics,
superoxide photosensitizers, and mixtures thereof; b.) said
extender is selected from the group consisting of furan,
substituted furans, alkyl ethoxylates, polyethoxylates, alkyl
polyethoxylates, polynuclear aromatics, imidazole, substituted
imidazoles, pyrrole, substituted pyrroles, and mixtures
thereof.
6. The photobleaching composition of claim 5 wherein: a.) said
water-soluble photosensitizer is selected from the group consisting
of sulfonated zinc phthalocyanine, sulphonated aluminum
phthalocyanine, silicon phthaolcyanine-di-isoPEG 384,
pyrenesulfonic acid, and mixtures thereof; b.) said extender is
selected from the group consisting of alkyl ethoxylates, imidazole,
2,5 dimethyl furan, 2-Furoic acid, 3-Furoic acid, and mixtures
thereof.
7. The photobleaching composition of claim 1 wherein said
composition is a solid.
8. The photobleaching cleaning composition of claim 1 wherein said
composition is a liquid, said liquid comprising an aqueous
fluid.
9. A kit comprising comprising: a.) the composition of claim 1; and
b.) instructions for use of said composition.
10. A photobleaching composition comprising: a.) from about 1 ppm
to about 1000 ppm of a water-soluble photosensitizer; b.) from
about 100 ppm to about 10,000 ppm of an extender; and c.) the
balance of said photobleaching compositions being an aqueous fluid,
and optionally an adjunct ingredient.
11. A photobleaching composition according to claim 10 comprising:
a.) from about 5 ppm to about 500 ppm of a water-soluble
photosensitizer; b.) from about 200 ppm to about 5,000 ppm of an
extender.
12. A photobleaching composition according to claim 11 comprising:
a.) from about 10 ppm to about 300 ppm of a water-soluble
photosensitizer; b.) from about 500 ppm to about 2,000 ppm of an
extender.
13. A photobleaching composition according to claim 10 wherein:
said extender comprises a surfactant.
14. A photobleaching composition according to claim 10 wherein a.)
said water-soluble photosensitizer is selected from the group
consisting porphyrins, phthalocyanines, C.sub.8-C.sub.70 aromatics,
superoxide photosensitizers, and mixtures thereof; b.) said
extender is selected from the group consisting of furan,
substituted furans, alkyl ethoxylates, polyethoxylates, alkyl
polyethoxylates, polynuclear aromatics, imidazole, substituted
imidazoles, pyrrole, substituted pyrroles, and mixtures
thereof.
15. The photobleaching composition of claim 14 wherein: a.) said
water-soluble photosensitizer is selected from the group consisting
of sulfonated zinc phthalocyanine, sulphonated aluminum
phthalocyanine, silicon phthaolcyanine-di-isoPEG 384,
pyrenesulfonic acid and mixtures thereof; b.) said extender is
selected from the group consisting of alkyl ethoxylates, imidazole,
2,5 dimethyl furan, 2-Furoic acid, 3-Furoic acid, and mixtures
thereof.
16. A process of making a photobleaching composition, said process
comprising the step of combining a water-soluble photosensitizer,
an extender and optionally a material selected from an aqueous
fluid, adjunct ingredient or mixture thereof to form said
photobleaching composition.
17. The process of claim 16 where said water-soluble
photosensitizer, an extender and optionally a material selected
from an aqueous fluid, adjunct ingredient or mixture thereof are
combined in such a manner such that said water-soluble
photosensitizer, an extender and optionally a material selected
from an aqueous fluid, adjunct ingredient or mixture thereof are
exposed to less than 1 milliwatt of light, having a wavelength
absorbed by said water-soluble photosensitizer, per square meter
solution surface exposed to said light and oxygen such that the
resulting mixture comprises less than 1.times.10.sup.-2 moles of
oxygen per liter.
18. A method of cleaning and/or bleaching a fabric or surface
comprising the steps of; a.) providing the photobleaching
composition of claim 10 with sufficient oxygen such that said
photobleaching composition comprises oxygen at a level of
1.times.10.sup.-9 moles per liter of said photobleaching
composition and sufficient light energy to generate bleaching
species; and b.) contacting a situs with said photobleaching
composition during or after said bleaching species are generated.
c.) optionally rinsing and/or washing said situs.
19. The method of claim 18 wherein said light energy is, based on
light having a wavelength that is absorbed by the photosensitizer
employed, sufficient to yield greater than 1.times.10.sup.-4
milliwatts/square meter of solution surface exposed to said
light.
20. The method of claim 19 wherein said light energy is provided by
a light source located in or on a domestic appliance suitable for
cleaning a situs.
Description
CROSS-REFERENCES TO RELATED APPLICATIONS
[0001] This application claims priority under 35 U.S.C. .sctn.
119(e) to U.S. Provisional Application Ser. No. 60/582,705 filed
Jun. 24, 2004.
FIELD OF THE INVENTION
[0002] The present invention relates to photobleaching compositions
having bleaching capabilities, and processes of making and using
same.
BACKGROUND OF THE INVENTION
[0003] Conventional bleaching compositions typically employ
hydrogen peroxide as a bleaching species or as an intermediate that
is converted into a peracid. Such systems can provide effective
bleaching. Unfortunately it is difficult to formulate stable
versions of such systems and such systems are not volume efficient
as the requisite bleaching components make up a large volume of any
formulation. While photobleaching systems do not suffer from the
formulation and volume issues of hydrogen peroxide systems,
photobleaching systems tend to be less effective as the short life
of the bleaching species requires that photosensitizer, oxygen,
light and the situs to be bleach be present simultaneously. In
addition, the choice of effective photobleaches used in traditional
photobleaching systems is limited as photobleaches generally must
be capable of being adsorbed on the soiled portion of the situs. As
a result, photobleach systems would be attractive if the life of
the bleaching species could be extended to permit diffusion of such
species in wash liquor.
SUMMARY OF THE INVENTION
[0004] The present invention relates to photobleaching compositions
comprising a photosensitizer that can be used to provide an aqueous
fluid with bleaching capabilities, aqueous fluid cleaning
compositions having photobleaching capabilities and processes of
making and using same.
[0005] These and other aspects, features and advantages will become
apparent to those of ordinary skill in the art from a reading of
the following detailed description and the appended claims.
DETAILED DESCRIPTION OF THE INVENTION
[0006] Definitions
[0007] As used herein, the term "photobleaching composition"
includes, unless otherwise indicated, granular or powder-form
all-purpose or "heavy-duty" washing agents, especially cleaning
detergents; liquid, gel or paste-form all-purpose washing agents,
especially the so-called heavy-duty liquid types; liquid
fine-fabric detergents; hand dishwashing agents or light duty
dishwashing agents, especially those of the high-foaming type;
machine dishwashing agents, including the various tablet, granular,
liquid and rinse-aid types for household and institutional use;
liquid cleaning and disinfecting agents, including antibacterial
hand-wash types, cleaning bars, mouthwashes, denture cleaners, car
or carpet shampoos, bathroom cleaners; hair shampoos and
hair-rinses; shower gels and foam baths and metal cleaners; as well
as cleaning auxiliaries such as bleach additives and "stain-stick"
or pre-treat types.
[0008] The term "fabrics" and "fabric" used herein the term
encompasses articles of clothing, linen, drapery, and clothing
accessories. The term also encompasses other items made in whole or
in part of fabric, such as tote bags, furniture covers, tarpaulins
and the like.
[0009] The term "soil" means any undesirable substance on a fabric.
By the terms "water-based" or "hydrophilic" soils, it is meant that
the soil comprised water at the time it first came in contact with
the fabric article, or the soil retains a significant portion of
water on the fabric article. Examples of water-based soils include,
but are not limited to beverages, many food soils, water soluble
dyes, bodily fluids such as sweat, urine or blood, outdoor soils
such as grass stains and mud.
[0010] As used herein, "aqueous fluid" means any liquid or mixture
of liquids that comprises greater than 5%, greater than 25%,
greater than 50% or alternatively greater than 90% water.
[0011] As used herein the word "soluble" when used to describe one
or more "photosensitizers" means capable of forming a solution at a
concentration of at least 1.times.10.sup.-8 molar in water at an
in-use pH of from 10 to 8.
[0012] As used herein, the articles a and an when used in a claim,
for example, "an emulsifier" or "a photosensitizer" is understood
to mean one or more of the material that is claimed or
described.
[0013] Unless otherwise noted, all component or composition levels
are in reference to the active level of that component or
composition, and are exclusive of impurities, for example, residual
solvents or by-products, which may be present in commercially
available sources.
[0014] All percentages and ratios are calculated by weight unless
otherwise indicated. All percentages and ratios are calculated
based on the total composition unless otherwise indicated.
[0015] All temperatures are in degrees Celsius (.degree. C.) unless
otherwise specified. All measurements are in SI units unless
otherwise specified.
[0016] It should be understood that every maximum numerical
limitation given throughout this specification includes every lower
numerical limitation, as if such lower numerical limitations were
expressly written herein. Every minimum numerical limitation given
throughout this specification will include every higher numerical
limitation, as if such higher numerical limitations were expressly
written herein. Every numerical range given throughout this
specification will include every narrower numerical range that
falls within such broader numerical range, as if such narrower
numerical ranges were all expressly written herein.
[0017] All documents cited are, in relevant part, incorporated
herein by reference; the citation of any document is not to be
construed as an admission that it is prior art with respect to the
present invention.
[0018] Photobleaching Compositions
[0019] Applicants have discovered that certain photosensitizer
compositions are unexpectedly suitable for incorporation into
aqueous fluids. Suitable photosensitizer compositions typically
contain a photosensitizer, and an extender, and may contain
optional ingredients such as anionic, cationic, nonionic, and
zwitterionic surfactants. Solid compositions, based on total weight
of said composition, may comprise from about 0.1% to about 50%,
from about 1% to about 25%, or even from about 5% to about 20% of a
photosensitizer; from about 1% to about 99.9%, from about 5% to
about 90%, or from even from about 10% to about 50% of an extender
with the balance of said compositions being a an optional/adjunct.
Such solid compositions include, but are not limited to, powders
and granules.
[0020] Fluid photosensitizer compositions may comprise, based on
the total weight of said composition, from about 0.1% to about 50%,
from about 1% to about 25%, or even from about 5% to about 20% of a
photosensitizer; from about 1% to about 99.9%, from about 5% to
about 90%, or from even from about 10% to about 50% of an extender
with the balance of said compositions with the balance of said
photobleaching compositions being an aqueous fluid or a mixture of
an aqueous fluid and an optional/adjunct ingredient.
[0021] The aforementioned solid photosensitizer compositions and
fluid photosensitizer compositions may be packaged in a kit
containing instructions for use.
[0022] Unlike common photobleaching compositions, the
aforementioned compositions do not require that the
photosensitizer, oxygen, light and the situs to be present
simultaneously as it is believed that the bleaching species is
formed in solution and, due to the use of an extender, such species
has sufficient life to diffuse to the soiled portion of the situs.
In addition, the use of an extender increases the formulator's
choice of photosensitizers, as such photosensitizers need not be
capable of being adsorbed on the soiled portion of the situs.
[0023] Process of Making
[0024] While not being bound by theory, Applicants believe that
formation and concentration of bleaching species other than singlet
oxygen is a function of at least 4 variables: reactant
concentration, time, oxygen concentration of the reactant mixture,
and photon flux. As a result, while Applicants, photobleaching
compositions may be made by combining a photosensitizer, and
extender, any aqueous fluid solvent and any optional ingredients,
light energy coming from light having a wavelength that can be
absorbed by that of the photosensitizer is minimized and/or the
oxygen amount of oxygen in the composition or to which the
composition is exposed is minimized. For the purposes of the
present invention the wavelength of light that any photosensitizer
will absorb is determined by the Light Absorbance Test found in the
Test Methods Section of the present specification. For purposes of
the present invention the minimization of light energy that can be
absorbed by the photosensitzer means that during processing such
compositions are generally exposed to such wavelength of light at
one of the following levels: less than about 1 milliwatt per square
meter of solution surface exposed to said light, less than about
1.times.10.sup.-4 watts per square meter of solution surface
exposed to said light, or even less than about 1 microwatt per
square meter of solution surface exposed said light. For purposes
of the present invention the minimization of oxygen means that
during processing the compositions comprise less than about
1.times.10.sup.-2 moles of oxygen per liter, less than about
1.times.10.sup.-3 moles of oxygen per liter, and even less than
about 1.times.10.sup.-4 moles of oxygen per liter.
[0025] In use photobleaching compositions may be made by exposing
the photobleaching compositions described herein to light having a
wavelength that can be absorbed by that of the photosensitizer and
sufficient oxygen to provide said composition with a dissolved
oxygen content of greater than about 1.times.10.sup.-9 moles per
liter, greater than about 1.times.10.sup.-6 moles per liter, or
even greater than about 1.times.10.sup.-3 moles per liter. The
amount of such light energy that is required to produce such in use
compositions is typically greater than about 1.times.10.sup.-4
milliwatts per square meter of solution surface exposed to said
light, greater than about 1 milliwatt per square meter of solution
surface exposed to said light, or even greater than
1.times.10.sup.-2 watts/square meter of solution surface exposed to
said light. Said light energy may be provided by any suitable
source, including but not limited a light source located in a
domestic appliance, said appliance being suitable for cleaning
and/or fabrics.
[0026] Method of Using
[0027] A situs inter alia a surface or fabric, may be bleached by
contacting at least a portion said situs with a liquid version of
Applicants' photobleaching compositions wherein the extender and
photosensitizer are dissolved in an aqueous fluid or dissolve while
in contact with the situs. Such compositions may be in neat form or
diluted in a wash liquor. As will be appreciated by the skilled
artisan, contacting includes but is not limited to, immersion and
spraying. After such contacting step, the situs may be optionally
washed and/or rinsed Such in use composition may be made during the
time that they are in contact with the item or items that are to be
cleaned.
[0028] Suitable Materials
[0029] Suitable materials for making Applicants' photobleaching
compositions include any known photosensitizer or mixture of
photosensitizers that generate singlet oxygen or superoxide and
that are soluble in an aqueous fluid. Suitable singlet oxygen
photosensitizers include water-soluble porphyrins and
phthalocyanines and their complexes with a photoactive
metal/non-metal selected from Sn, Ge, Pt, Pd, Pb, Si, Zn, Al. For
example, sulfonated zinc phthalocyanine, sulphonated aluminum
phthalocyanine, silicon phthaolcyanine-di-isoPEG 384 and other
water soluble phthalocyanines described in U.S. Pat. No. 5,916,481,
zinc-5,10,15,20-tetra(4-pyridyl)-21H, 23H-porphine
tetrakis(methochloride), porphine tetrakis benzoic acid sodium
salt. Other suitable photosensitizers include water-soluble
aromatic and heteroaromatic singlet oxygen photosensitizers such
as, acridine carboxylic acid, perylene tetracarboxylic acid,
pyrenesulfonic acid, 9-Fluorenone-1-carboxylic acid. Water-soluble
photosensitizers such as methylene blue, rose Bengal, riboflavin.
Examples of superoxide photosensitizers include triethanolamine
substituted silicon phthalocyanines described in U.S. Pat. No.
6,225,273 and curcumin. Suitable water-soluble photosensitizers may
be obtained from Sigma-Aldrich of Milwaukee, Wis. U.S.A., Ciba
Specialty Chemicals Inc. of Basel, Switzerland or prepared by
literature procedures.
[0030] Suitable extenders include species that form adducts with
singlet oxygen or superoxide. For example, suitable singlet oxygen
extenders include extenders selected from the group consisting of
furan, substituted furans, polyethoxylates, alkyl polyethoxylates,
polynuclear aromatics, imidazole, substituted imidazoles, pyrrole,
substituted pyrroles, and mixtures thereof. Examples of suitable
extenders include: Furfuryl alcohol, 2-Furoic acid, 3-Furoic acid,
3-Furanmethanol, 2-benzofurancarboxylic acid,
1,4-Dimethylnaphthalene, Furfural, 2,5 dimethyl furan and mixtures
thereof. Such materials may be obtained from Sigma-Aldrich of
Milwaukee, Wis. U.S.A. Additional materials that may be useful as
extenders include surfactants, such as alkyl ethoxylates, for
example, Neodol.TM. 91-2.5 which is supplied Shell Chemicals of
Houston, Tex. U.S.A. Such surfactants can function as cleaning
adjuncts and as extenders.
[0031] Optional/Adjunct Ingredients
[0032] While not essential for the purposes of the present
invention, the non-limiting list of adjuncts illustrated
hereinafter are suitable for use in the instant photobleaching
compositions and may be desirably incorporated in preferred
embodiments of the invention, for example to assist or enhance
cleaning performance, for treatment of the substrate to be cleaned,
or to modify the aesthetics of the photobleaching composition as is
the case with perfumes, colorants, dyes or the like. The precise
nature of these additional components, and levels of incorporation
thereof, will depend on the physical form of the composition and
the nature of the cleaning operation for which it is to be used.
Suitable adjunct materials include, but are not limited to,
additional bleach activators, surfactants, builders, chelating
agents, dye transfer inhibiting agents, dispersants, enzymes, and
enzyme stabilizers, catalytic metal complexes, polymeric dispersing
agents, clay and soil removal/anti-redeposition agents,
brighteners, suds suppressors, dyes, perfumes, structure
elasticizing agents, fabric softeners, carriers, hydrotropes,
processing aids and/or pigments. In addition to the disclosure
below, suitable examples of such other adjuncts and levels of use
are found in U.S. Pat. Nos. 5,576,282, 6,306,812 B1 and 6,326,348
B1.
[0033] Additional Bleach Activators--Suitable bleach activators
that may be used in conjunction with Applicants' organic activator
include, but are not limited to, tetraacetyl ethylene diamine
(TAED), benzoylcaprolactam (BzCL), 4-nitrobenzoylcaprolactam,
3-chlorobenzoylcaprolactam, benzoyloxybenzenesulphonate (BOBS),
nonanoyloxybenzenesulphonate (NOBS), phenyl benzoate (PhBz),
decanoyloxybenzenesulphonate (C.sub.10-OBS), benzoylvalerolactam
(BZVL), octanoyloxybenzenesulphonate (C.sub.8--OBS),
perhydrolyzable esters, perhydrolyzable carbonates, perhydrolyzable
imides and mixtures thereof.
[0034] Surfactants--Preferably, the photobleaching compositions of
the present invention comprise a surfactant or surfactant system
wherein the surfactant can be selected from nonionic and/or anionic
and/or cationic surfactants and/or ampholytic and/or zwitterionic
and/or semi-polar nonionic surfactants.
[0035] The surfactant or surfactant system is typically present at
a level of from about 0.1%, preferably from about 1%, more
preferably from about 5% by weight of the photobleaching
compositions to about 99.9%, preferably about 80%, more preferably
about 35%, most preferably about 30% by weight of the
photobleaching composition.
[0036] Builders--The photobleaching compositions of the present
invention preferably comprise one or more detergent builders or
builder systems. When present, the compositions will typically
comprise at least about 1% builder, preferably at least about 5%,
more preferably from about 10% to about 80%, preferably to about
50%, more preferably to about 30% by weight of the photobleaching
composition.
[0037] Builders include, but are not limited to, the alkali metal,
ammonium and alkanolammonium salts of polyphosphates, alkali metal
silicates, alkaline earth and alkali metal carbonates,
aluminosilicate builders polycarboxylate compounds, ether
hydroxypolycarboxylates, copolymers of maleic anhydride with
ethylene or vinyl methyl ether, 1,3,5-trihydroxy
benzene-2,4,6-trisulphonic acid, and carboxymethyloxysuccinic acid,
the various alkali metal, ammonium and substituted ammonium salts
of polyacetic acids such as ethylenediamine tetraacetic acid and
nitrilotriacetic acid, as well as polycarboxylates such as mellitic
acid, succinic acid, oxydisuccinic acid, polymaleic acid, benzene
1,3,5-tricarboxylic acid, carboxymethyloxysuccinic acid, and
soluble salts thereof.
[0038] Chelating Agents--The photobleaching compositions of the
present invention may also optionally contain one or more copper,
iron and/or manganese chelating agents.
[0039] If utilized, chelating agents will generally comprise from
about 0.1%, more preferably from about 3.0% to about 15% by weight
of the photobleaching composition.
[0040] Dye Transfer Inhibiting Agents--The photobleaching
compositions of the present invention may also include one or more
dye transfer inhibiting agents. Suitable polymeric dye transfer
inhibiting agents include, but are not limited to,
polyvinylpyrrolidone polymers, polyamine N-oxide polymers,
copolymers of N-vinylpyrrolidone and N-vinylimidazole,
polyvinyloxazolidones and polyvinylimidazoles or mixtures
thereof.
[0041] When present in the photobleaching compositions of the
present invention, the dye transfer inhibiting agents are present
at levels from about 0.0001%, more preferably from about 0.01%,
most preferably from about 0.05% by weight of the photobleaching
compositions to about 10%, more preferably about 2%, most
preferably about 1% by weight of the photobleaching
composition.
[0042] Dispersants--The photobleaching compositions of the present
invention can also contain dispersants. Suitable water-soluble
organic salts are the homo- or co-polymeric acids or their salts,
in which the polycarboxylic acid comprises at least two carboxyl
radicals separated from each other by not more than two carbon
atoms.
[0043] Enzymes--The photobleaching compositions can comprise one or
more enzymes that provide cleaning performance and/or fabric care
benefits. Examples of suitable enzymes include, but are not limited
to, hemicellulases, peroxidases, proteases, cellulases, xylanases,
lipases, phospholipases, esterases, cutinases, pectinases,
keratanases, reductases, oxidases, phenoloxidases, lipoxygenases,
ligninases, pullulanases, tannases, pentosanases, malanases,
.beta.-glucanases, arabinosidases, hyaluronidase, chondroitinase,
laccase, and known amylases, or mixtures thereof.
[0044] Enzyme Stabilizers--Enzymes for use in detergents can be
stabilized by various techniques including the use of water-soluble
sources of calcium and/or magnesium ions in the photobleaching
compositions.
[0045] Bleach Boosting Compounds--The photobleaching compositions
herein may comprise one or more bleach boosting compounds such as a
dioxirane, an oxaziridine, or an oxaziridinium or compounds capable
of forming such species in situ.
[0046] Among suitable bleach boosting compounds for use in
accordance with the present invention are cationic imines,
zwitterionic imines, anionic imines and/or polyionic imines having
a net charge of from about +3 to about -3, and mixtures thereof.
These imine bleach boosting compounds of the present invention
include those of the general structure: 1
[0047] where for Formula I above, R.sup.1-R.sup.4 may be a hydrogen
or an unsubstituted or substituted radical selected from the group
consisting of phenyl, aryl, heterocyclic ring, alkyl and cycloalkyl
radicals.
[0048] Among preferred bleach boosting compounds are zwitterionic
bleach boosters, which are described in U.S. Pat. Nos. 5,576,282
and 5,718,614. Other bleach boosting compounds include cationic
bleach boosters such as those described in U.S. Pat. Nos.
5,360,569, and 5,370,826.
[0049] Catalytic Metal Complexes--Applicants' photobleaching
compositions may include catalytic metal complexes. One type of
metal-containing bleach catalyst is a catalyst system comprising a
transition metal cation of defined bleach catalytic activity, such
as copper, iron, titanium, ruthenium, tungsten, molybdenum, or
manganese cations, an auxiliary metal cation having little or no
bleach catalytic activity, such as zinc or aluminum cations, and a
sequestrate having defined stability constants for the catalytic
and auxiliary metal cations, particularly
ethylenediaminetetraacetic acid, ethylenediaminetetra
(methylenephosphonic acid) and water-soluble salts thereof. Such
catalysts are disclosed in U.S. Pat. No. 4,430,243.
[0050] If desired, the photobleaching compositions herein can be
catalyzed by means of a manganese compound. Such compounds and
levels of use are well known in the art and include, for example,
the manganese-based catalysts disclosed in U.S. Pat. No.
5,576,282.
[0051] Cobalt bleach catalysts useful herein are known, and are
described, for example, in U.S. Pat. No. 5,597,936, U.S. Pat. No.
5,595,967.
[0052] Compositions herein may also suitably include a transition
metal complex of a macropolycyclic rigid ligand--abbreviated as
"MRL". As a practical matter, and not by way of limitation, the
photobleaching compositions and cleaning processes herein can be
adjusted to provide on the order of at least one part per hundred
million of the active MRL species in the aqueous washing medium,
and will preferably provide from about 0.005 ppm to about 25 ppm,
more preferably from about 0.05 ppm to about 10 ppm, and most
preferably from about 0.1 ppm to about 5 ppm, of the MRL in the
wash liquor.
[0053] Preferred transition-metals in the instant transition-metal
bleach catalyst include manganese, iron and chromium. Preferred
MRL's herein are a special type of ultra-rigid ligand that is
cross-bridged such as
5,12-diethyl-1,5,8,12-tetraazabicyclo[6.6.2]hexadecane.
[0054] Suitable transition metal MRLs are readily prepared by known
procedures, such as taught for example in WO 00/332601, and U.S.
Pat. No. 6,225,464.
Test Methods
[0055] Light Absorbance Test (Process for determining wavelength of
light absorbed by a photosensitizer)
[0056] 1.) Dissolve a sufficient amount of photosensitizer of
choice in the solvent of choice to obtain a maximum absorbance,
between 250 nanometers and 700 nanometers, of 1.
[0057] 2.) For purposes of this invention, any wavelength of light
wherein such photosensitizer has an absorbance of 0.01 is
considered to be a wavelength that is absorbed by the
photosensitizer
EXAMPLES
Example 1
[0058] The following bleach composition is prepared by combining
sulphonated zinc phthalocyanine, imidazole and the cleaning
adjuncts while avoiding exposure to light.
1 Sulphonated zinc phthalocyanine 0.1% Imidazole 1% Cleaning
adjuncts Balance
[0059] 100 grams of the above described bleach composition is added
to 30 liters of aqueous wash liquor in a suitable washing machine
and the wash liquor is illuminated with a light source emitting in
at least one of the absorbance peaks of the sulphonated zinc
phthalocyanine while being agitated for a period of 15 minutes. The
wash liquor is removed and the fabrics are rinsed.
Example 2
[0060] The following bleach composition is prepared by combining
silicon phthalocyanine-di-isoPEG 384, benzofuran carboxylic acid
and the cleaning adjuncts while avoiding exposure to light.
2 Silicon phthalocyanine-di-isoPEG 384 0.01% Benzofuran carboxylic
acid 0.5% Cleaning adjuncts Balance
[0061] 100 grams of the above described bleach composition is added
to 30 liters of aqueous wash liquor in a suitable washing machine
and the wash liquor is illuminated with a light source emitting in
at least one of the absorbance peaks of the silicon
phthalocyanine-di-isoPEG 384 while being agitated for a period of
15 minutes. The wash liquor is removed and the fabrics are
rinsed.
Example 3
[0062] The following bleach composition is prepared by combining
acridine carboxylic acid, 2-furoic acid and the cleaning adjuncts
while avoiding exposure to light.
3 Acridine carboxylic acid 0.5% 2-furoic acid 5% Cleaning adjuncts
Balance
[0063] 100 grams of the above described bleach composition is added
to 30 liters of aqueous wash liquor in a suitable washing machine
and the wash liquor is illuminated with a light source emitting in
at least one of the absorbance peaks of the acridine carboxylic
acid while being agitated for a period of 15 minutes. The wash
liquor is removed and the fabrics are rinsed.
Example 4
[0064] The following bleach composition is prepared by combining
9-fluorenone-1-carboxylic acid, 5-benzimidazolecaboxylic acid and
the cleaning adjuncts while avoiding exposure to light.
4 9-fluorenone-1-carboxylic acid 0.1% 5-benzimidazolecaboxylic acid
1% Cleaning adjuncts Balance
[0065] 100 grams of the above described bleach composition is added
to 30 liters of aqueous wash liquor in a suitable washing machine
and the wash liquor is illuminated with a light source emitting in
at least one of the absorbance peaks of the
9-fluorenone-1-carboxylic acid while being agitated for a period of
15 minutes. The wash liquor is removed and the fabrics are
rinsed.
[0066] While particular embodiments of the present invention have
been illustrated and described, it would be obvious to those
skilled in the art that various other changes and modifications can
be made without departing from the spirit and scope of the
invention. It is therefore intended to cover in the appended claims
all such changes and modifications that are within the scope of
this invention.
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