WO2015099642A1

WO2015099642A1 - Whitening oral care compositions

Info

Publication number: WO2015099642A1
Application number: PCT/US2013/077386
Authority: WO
Inventors: Venda P. MALONEY; Suman K. Chopra; Dennis ONTUMI
Original assignee: Colgate-Palmolive Company
Priority date: 2013-12-23
Filing date: 2013-12-23
Publication date: 2015-07-02
Also published as: MX357599B; PH12016501054A1; US20170027824A1; BR112016013753A2; RU2016125147A; CN105828797A; EP3086769A1; EP3086769B1; US9901521B2; BR112016013753B1; RU2673236C2; IL246232A0; TW201534339A; AU2013408900A1; AU2013408900B2; AR098922A1; MX2016007837A

Abstract

Described herein are oral care compositions comprising a crosslinked polyvinylpyrrolidone complexed with hydrogen peroxide, together with a blue to violet-blue pigment; including some embodiments which further comprise an ethylene oxide, propylene oxide block co-polymer.

Description

WHITENING ORAL CARE COM POSH' IO S BACKGROUND

10001] Many individuals are dissatisfied with their current tooth color. Thus, there is a desire for whiter teet and one means to achieve whiter teeth is the use of tooth whitening products.

[0002] it is known in the literature that the visual perception of a white substance can be altered through the deposition of an optica! brightener, blue pigment or bine dye, especially one tor which the hue angle (in the CIELAB scale ) of the reflected or emitted light is between 200 to 320 degrees. This effect is commonly used in laundry detergent products to make white clothes appear "whiter" to the human eye. The same concept has been applied to tooth whitening as well. The natural off-white or yellow color of teeth can he made to appear whiter through the deposition of a blue substance onto teeth. Using pigments with a deposition aid, i.e., high molecular weight Gantrez® type polymers (copolymers of raaleic anhydride and with methyl vinylether) in toothpaste to make teeth look whiter is disclosed in EP 1935395B1.

[0003] Dentifrice formulations comprising peroxide are known and useful for cleaning and whitening teeth. The peroxide can bleach the teeth, remove stains, and. kill cariogenic bacteria. However, peroxide compounds are highly reactive, and consequently difficult to formulate. Moreover, hydrogen peroxide can spontaneously decompose to form oxygen gas ((¾) and. water, so that on storage, the dentifrice containers mav bloat, burst or leak, and the remaining formulation will not have enough peroxide remaining to clea and whiten teeth effectively. Some dentifrices initially comprise very high levels of peroxide, which decomposes over time, so that the exact amount of peroxide delivered on application is variable and largely depends on how long and under what conditions the dentifrice has been stored.

[0004] Due to the color bleaching property of hydrogen peroxide,prodncts containing hydrogen peroxide are usually clear or off white.

|OO05| There is thus a need for improved color stable whitening oral compositions which effectively stabilizes both hydrogen peroxide and pigment that are suitable for everyday consumer use.

BRIEF SUMMARY

[0006] in some embodiments, the present invention provides oral care compositions that are stable during long term storage and remain effective to clean and whiten teeth. In some embodiments, the invention provides an oral care composition composing: (i) a erossiinked polyvinylpyrrolidone conipiexed with hydrogen peroxide ("PVP-H2O2 ") and (ii) a pigment having a blue to blue-violet color with a hue angle in the CIELAB system ranging from 200 to 320 degrees.

[0007} In other embodiments, the i vention provides an. oral care composition comprising (i) a erossiinked polyvinylpyrrolidone compiexed with hydrogen peroxide, and (ii) a pigment having a bine to blue-violet color with a hue angle in the CIELAB system ranging from 200 to 320 degrees, and (iii) an ethylene oxide, propylene oxide block co-polymer of formula (ethylene oxide}_s~(propylene oxide)y wherein x is an integer of 80- 150 and y is an integer 30-80, having an average molecular weight of greater than 5000 Da.

[0008] Further areas of applicability of the present invention will become apparent from the detailed description provided hereinafter. It should be understood thai the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.

DETAILED DESCRIPTION

[OO0 | The fol lo wing description of the preferred embodinient(s) is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses.

[0010] As used throughout, ranges are used as shorthand for describing each and every value that is within the range. Any value within the range can be selected as the terminus of the range. in addition, all references cited herein are hereby incorporated by referenced in their entireties. In the event of a conflict in a definition in the present disclosure and that of a cited reference, the present disclosure controls,

[0011} Unless otherwise specified, all percentages and amounts expressed herein and elsewhere in the specification should be understood to refer to percentages by weight. The term "w6¾" is an abbreviation for weight percent. The amounts given are based on the active weight of the materia!,

[0012J In some embodiments the compositions of the invention further comprise an abrasive. In some embodiments, the abrasive is a calcium abrasive, in particular calcium pyrophosphate.

[0013} By exposure to aqueous environments, as in the oral cavity, the PVP-H2.O2 dissociates into individual species (PVP polymer and H2O2). The PVP-H2O2 complex is generally comprised of about 80% by weight polyvinyl pyrrolidone and 20% by weight H2Q2. Single phase whitening dentifrice compounds comprising PVP-H2.O2 complexes are described, e.g., in WO/2007/037961, and its parent US Pub. No. US 2007-0071695 A L the contents of which are incorporated herein by reference.

{0014_.1 Peroxide is added to oral care compositions such as dentifrice, mouihrinses, strips, and gels to whiten teeth through the bleaching of stains. Peroxide removes color compounds by oxidation, in which the chemical bonds that make u the chroniophore are broken and the molecule is changed into a different substance thai does not contain the chroniophore and does not absorb visible light. For this reason most oral care product containing peroxide are clear gels or off white. It has been surprisingly discovered that blue pigment color is not bleached by peroxide in the oral compositions of the invention. Thus, the present invention concerns a color stable formulation which effectively stabilizes both hydrogen peroxide and blue to blue-violet pigment.

[OOISJ Additionally, at a low concentration of peroxide, e.g., 0,01 to 4 wt%, in one embodiment 0.01 to 0.3 wi%, in another embodiment O. i to 0.3 wt%, in a dentifrice or mouthwash, it can be difficult for the low concentration of peroxide to provide instant whitening, i.e., whitening after only one use. The present invention achieves instant whitening at low levels of peroxide by combining with a blue to blue- violet pigment. Objects appear white because all colors are reflected back to the eye. The enamel is more transparent to blue light and so many stains absorb blue light. This reduces the whiteness of the enamel. Applying a blue to blue-violet color to the surface of teeth can mask yellow color by increasing the amount of blue or blue-violet light that is reflected back to the eye. Thus, blue to blue- violet color is capable of increasing the whitening perception of a tooth. Even white teeth can be made to appear whiter. The present invention provides a formulation which effectively delivers both hydrogen peroxide and blue to blue-violet pigment to provide an even higher superior whitening efficacy.

[00 | Accordingly, the invention provides a dentifrice comprising (i) a crosslinked polyvinylpyrrolidone co plexed with hydrogen peroxide, (ii) a pigment having a blue to blue- violet color with a hue angle in the CSELAB system ranging from 200 to 320 degrees and, in one embodiment, (iii) an ethylene oxide, propylene oxide block co-polymer of formula (ethylene oxide}_x-ipropylene oxide wherein x is an integer of 80-150, e.g. 100-130, e.g. about 118, and y is an integer 30-80, e.g. about 60-70, e.g. about 66, having an average molecular weight of greater than 5000, e.g., 8000 - 13000 Da, e.g. about 9800, In some embodiments the ethylene oxide, propylene oxide co-polymer is substantially free of an ethylene oxide, propylene oxide block co-polymer of average molecular weight less than 5000 Da. An example of a. suitable commercially available ethylene oxide, propylene oxide co-polymer is P.LURACARE® L 1220 (available from BASF, Wyandotte, Mich., United States of America).

[0017| In some embodiments, the invention provides a toothpaste comprising an abrasive, e.g., a calcium abrasive. In other embodiments, the invention provides an abrasive-free gel.

{00.18) For example, the invention provides Composition , an oral composition such as a dentifrice comprising (i) a whitening complex comprising crosslinked polyvinylpyrrolidone cotnp!exed with hydrogen peroxide, (ii) a pigment having a blue to blue-violet color with a hoe angle in the CI EL A B system ranging from 200 to 320 degrees, e.g.;

1.1 Compositio 1 wherein said composition further comprises (iii) an ethylene oxide, propylene oxide block co-polymer of formula (ethylene oxide -(propylene oxide ^ wherein x is an integer of 80- 150, e.g. 100-130, e.g. about 1 18, and y is an integer 30-80, e.g. about 60-70, e.g. about 66, having an average molecular weight of greater man 5000, e.g., 8000 - 13000 Da, e.g. about 9800, in an amount, e.g., of 0.01 to 15 wi%, or 5 to 2wt%, or about 7.5 wt%,

1.2 Composition 1 or 1.1 wherein the whitening complex contains about 1.0-30 wt%, e.g., 15-25 wt.%, for example about 17-22 wt% of hydrogen peroxide by weight, and about 5-15 wt%, for example about 7-12 wt% total nitrogen by weight; for example, having substantially the same specifications as Polyplasdone® XL- 10, e.g., Poiyplasdone® XL-IOF, e.g., available from International Specialty Products { Wayne, NX);

1.3 Any of the foregoing compositions wherein the pigment has a hue angle in the CIELAB system ranging from 250 to 290 degrees;

1.4 Any of the foregoing compositions wherein the pigment is blue pigment such as Pigment Blue 2, 9, 10, 14, 15. 15:1, 15:2, 15:3, 15:4, 15:6 16, 18, 19, 24: 1, 25, 56, 60, 61 , 62 or 66, in particular Pigment Blue 15:

1.5 Any of the foregoing compositions further comprising a calcium abrasive wherein the calcium abrasive comprises a calcium phosphate salt, e.g., calcium pyrophosphate, dicaScium orthophosphate dilrydrate.. tricalcium phosphate, and calcium poly etaphosphate;

1.6 The immediately foregoing composition wherein the calcium abrasive comprises calcium pyrophosphate: 1.7 Composition 1.5 wherein the calcium abrasive comprises calcium carbonate;

1.8 Any of ihe foregoing compositions wherein the total amount of hydrogen peroxide by weight of the composition is 0,01 to 4%, or 0.01 to 3%. or 0.05 or 3%₅ or 0.075 to

2%, or 0.1 to 1.5%, or 0.01 to 0.3%, or 0. 1 to 0.3%, or about 0.1%;

1.9 Any of the foregoing compositions wherein the amount of pigment by weight in the oral composition is 0.0! to 3%, or 0.02 to 1%, or 0.05 to 0.3%, or 0.02 to 0.3%, or 0.0! to 0.08%, e.g., about 0.075%;

1.10 Any of the foregoing compositions which contains less than 2 wt% water, e.g., less than 1 t% water, e.g., is substantially anhydrous;

1.1 1 Any of the foregoing compositions comprising polymer thickeners selected from (i) polyethylene glycol, (ii) polyethylene glycol - polypropylene glycol block co-polymers having a molecular weight of at least 5000, and (iii) combinations thereof;

1.12 Any of the foregoing compositions additionally comprising polyethylene glycol of average molecular weight 400 to 800, e.g., about 600 Da;

1.13 Any of the foregoing compositions additionally comprising humectants, e.g. selected from glycerin, propylene glycol or a combination thereof;

1.14 Any of the foregoing compositions additionally comprising a tartar control agent, e.g., selected from tetrasodium pyrophosphate (TSPP) and sodiom acid pyrophosphate (S APP);

1.15 Any of the foregoing compositions additionally comprising a surfactant., e.g., sodium !auryi sulfate (SLS);

1.16 Any of the foregoing compositions additionally comprising an antibacterial agent, e.g., triclosan;

1.1 7 Any of the foregoing compositions additionally comprising an antioxidant, e.g. , buty!ated hydoxytoluene (BHT);

1.18 Any of the foregoing compositions comprising any or all of the .following ingredient classes and or particular ingredients by weight;

Humectants, e.g. Glycerin 10-60%, or 20-50%, e.g., about 35% |

Propylene glycol 0.01-60%, or 5-25% e.g., about 15%

Thickeners, e.g.. Fumed silica 0-3%₅ e.g., about 1.75% |

Polymers, e.g., Ethylene oxide, propylene 0.01 - 15%, or 5- 12%, e.g., about 7.5%

oxide block co-polymer, avg. M W >5kDa Polyethylene glycol 600 0-15% or 1 -15%, e.g., about 6% 1 additional linear and/or crosslinked 0-10%, or 1 -10%. or 0.25-1.0 %. e.¾., about po !yvi ny ipyrroli done 5.75% ~ 1

Crosslinked polyvinylpyrrolidone 0.05-25%, or 0.1-15%, or 0.25- 10%, e.g., comple ed with 15-25% hydrogen peroxide about 0.55%

Abrasive, e.g., Calcium pyrophosphate 0,01 -45%, or about 5-30%, e.g., about 20%

Fluoride, Sodium monof! uorophosp ate 0-2% or about 0.1-1.5%, e.g. about ί . ΐ %

Surfactant, e.g., SLS 0-3%, or 0.1 -3%, e.g., about 2%> |

Tartar contra! agent, e.g. TSPP and/or SAPP 0,01-5%, or 0.1-4% e.g., about 2% j

Antioxidant, e.g. BHT 0.01 -5%, e.g., about 0.03 j

Flavorings 0.1 - 5, e.g., 1.4% j

Phosphoric acid 0.01 -3%, e.g., 0.2% 1

Pigment Blue, e.g.. Pigment Blue 15 0.01 -3%, or 0.02- 1 %, or 0.01-0.3%, or

0.01-0.08%, e.g., about 0.075%

Water <3% j

1.19 The composition resulting from die combination of the preceding ingredients;

1.20 Any of the foregoing compositions in the form of a mouthwash or toothpaste, 0 I9| In another embodiment, the invention provides dentifrice comprising a crosslinked polyvinylpyrrolidone complexed with hydrogen peroxide,, together with additional linear and/or crosslinked polyvinylpyrrolidone, and a dentifrice carrier.

jflOlOf In some embodiments, the present invention provides oral care compositions composing; a crosslinked polyvinylpyrrolidone complexed with hydrogen peroxide, a blue to bine-violet pigment, a stabilizing amount of an additional, linear and/or crosslinked. polyvinylpyrrolidone, an abrasive and a humectant.

{0021 J Some embodiments provide oral care compositions comprising: from about 0.05 to about 25%, by weight, crosslinked polyvinylpyrrolidone complexed with hydrogen peroxide. Other embodiments provide oral care compositions comprising; from about O. i to about 15%, by weight, crosslinked polyvinylpyrrolidone complexed with hydrogen, peroxide, Still other embodiments provide oral care compositions comprising: from, about 0.25 to about 10%, by weight, crosslinked polyvinylpyrrolidone complexed with hydrogen peroxide. Yet other embodiments provide oral care compositions comprising: from about 0.5 to about 10%, by weight, crosslinked polyvinylpyrrolidone complexed with hydrogen peroxide. While other embodiments provide oral care compositions comprising; from about 0.5 to about 8%, by weight, cross!inked polyvinylpyrrolidone eomplexed with hydroge peroxide, hi some embodiments, the oral care compositions comprise 0.5 to about 5%, by weight, crosslinked polyvinylpyrroHdone eomplexed with hydrogen peroxide, or about 0.5 to about 3%, by weight, crosslinked polyvinyipyrrolidone eomplexed with hydrogen peroxide, or about 0.5 to about 2 %, by weight, crosslinked polyvinylpyrrolidone eomplexed with hydrogen peroxide, or about 0.55%, by weight, crosslinked polyvinylpyrrolidone eomplexed with hydrogen peroxide.

{0022) In some embodiments, the present invention provides oral care compositions comprising from about 1 to about 20% of an additional linear and/or crosslinked polyvinylpyrrolidone. Some embodiments provide compositions comprising from about 1 to about 15%, by weight, of an additional linear and or crosslinked polyvinylpyrrolidone. Some embodiments provide compositions comprising from about 1 to about 10%, by weight, of an additional linear and/or crosslinked polyvinylpyrrolidone. Some embodiments provide compositions comprising from about 5 to about 15%, by weight, of an additi onal linear and/or crossli nked polyvinylpyrrolidone. Other embodiments provide compositions comprising from about 7 to about 12%, by weight, of an additional linear and/or crosslinked polyvinylpyrrolidone. Further embodiments provide oral care compositions comprising from about 8 to about 1 1%, by weight, of an additional linear and/or crosslinked polyvinylpyrrolidone. Still further embodiments provide compositions comprising from about 8,5 to about 1 %, by weight, of an additional linear and/or crosslinked polyvinylpyrrolidone. Still other embodiments provide oral care compositions comprising 9.9% or 10%, by weight, of an additional linear and/or crosslinked polyvinylpyrrolidone. Yet other embodiments provide oral care compositions comprising about 9%, by weight., of an additional linear and or crosslinked polyvinylpyrrolidone.

[00231 The amount of pigment in the oral composition is from 0.0.1 to 3%, more particularly from 0.02 to 1 %, and more particularly from 0.01 to 0.08% by weight. The pigment may be uniformly spread throughout the composition or, it may be dispersed in a second phase such as a. stripe or other coextruded second phase. Such "dual phase" compositions have the advantage that the phases may be differently colored, presenting a more visually attractive product to the consumer.

[0024) In some embodiment the pigment is violet or blue, preferably one of those listed in the Colour Index International. These pigments are listed as pigment violet 1 through to pigment violet 56 and pigment blue 1 through 83, Examples of pigment violets are pigment violet 1 , 1 : 1, 1:2, 2, 3, 5: 1 , 13, 19, 23, 25, 27, 31 , 32, 37, 39, 42, 44 aad 50. Examples of pigment blues are pigment blue 1 , 2, 9, 10, 14, 15, 15: 1 , 15:2, 15:3, 15:4, 15:6 16, 18, 19, 24: 1 , 25, 56, 60, 61 , 62 and 66. Otiier suitable pigments are pigment ultxamarme blue and ultramarine violet. The pigment should have a hue angle, h, in the CIELAB system of from 200 to 320 degrees more particularly between 250 and 290 degrees. A detailed description of hue angle may be found on p$7 of Colour Chemistry 3rd edition by H. Zollinger published by Wiiey-VCH. While the preferred single pigments are blue or violet, the same effect may be achieved through mixing pigments outside of this h range; for example, such a hue angle ma also be obtained by mixing a red and blue pigment to yield a blue or blue-violet shaded pigment. Typically, the pigment is Figment Blue 15, more specifically Pigment Blue 15: 1, 15:2, 15:3, 15:4, 15:5 or 15:6. Typically, the pigment is capable of reflecting sufficient Sight such that the treated tooth is perceivably whiter than its initial color. Preferably, the pigment is colored such that its natural colo is within the violet-red to green-blue color, typically from violet to blue. If a red pigment is used, the red pigment is typically present in a weight ratio of red pigment to blue pigment of about 0, 1 : 1 to about 1 : 1. The red pigment used should be stable in peroxide composition.

|Θ025| A pigment is generally understood to be a shade/material which is insoluble in the relevant medium, at the relevant temperature. This is in contrast to dyes which are soluble. In the context of this invention, the "relevant medium" is human saliva, the liquid medium in which the composition is used, at the temperature of the oral cavity during brushing of the teeth,, i.e. up to 37°C. As a reasonable approximation, the relevant medium may be considered to be water and the relevant temperature to be 25°C.

[0026J in addition to the pigment and PVP/¾Q₂ complex, the compositions of the invention comprise an orally acceptable carrier, which includes all ingredients other than the pigment and PVP/¾(¾ complex.

|0027| Some embodiments of the present invention provide a toothpaste or gel-based peroxide compositions further comprise a calcium abrasive, in some embodiments, the compositions comprise from about 9 to about 25%, by weight, propylene glycol. In some embodiments, the compositions comprise from about 14 to about 32%, by weight, glycerin. In other embodiments, the compositions comprise less than 20%, by weight, of a calcium abrasive. Some embodiments provide compositions comprising from about 9 to about 25%, by weight, propylene glycol; from about 1.4 to about 32%, by weight, glycerin; and about 5 to about 30%, by weight, of a calcium abrasive.

|0028| Still other embodiments provide oral care compositions comprising from about 20 to about 60%, by weight, humectant.

[0029] Yet -further embodiments provide oral care compositions comprising from about 5 to about 60%, or 5 to 30%, or 5 to 25%, or 10 to 25% by weight, abrasive.

{0030f The compositions of the invention "low water" content, meaning that, a total concentration of water, including any free water and ail water contained in any ingredients, is less than about 5%, preferably less than 3%, preferably less than 2% water.

(00311 Where abrasives are present, the average particle size is generally about 0.1 to about 30 microns, for example about 1 to about 20 or about 5 to about 1 5 microns.

[0032] in various embodiments of the present invention, the oral composition, comprises an anticalculus (tartar control) agent. Generally, tartar control agents are categorized as being incompatible with some whitening agen ts, but embodiments of the pr esent invention incorporate tartar control agents and whitening agents in a single phase whitening composition. Suitable anticalculus agents include without limitation phosphates and polyphosphates (for example pyrophosphates}, polyannnopropanesulfonic acid (AMPS), hexameiaphosphate salts, zinc citrate frihydrate, polypeptides, polyolefin sulfonates, polyolefin phosphates, diphosphonates. In some embodiments the anticalculus agent is present at about 0.1% to about 30%. The oral composition may include a mixture of different anticalculus agents. I n one preferred embodiment, tetrasodium pyrophosphate (TSPP) and/or sodium acid pyrophosphate (SAPP) ate used. In the one embodiment, the anticalculus agent comprises TSPP at about 1-2% and/or SAPP at about 0.5 to 5%. In another embodiment, tetrasodium pyrophosphate (TSPP) and/or sodium tripolyphosphate (STPP) are used. In one preferred embodiment, the anticalculus agent comprises TSPP at about .1-2% and/or SAPP at about 0.01% to 10%, or 0.01 to 5%, or 0.1 to 5%, or 0.1 to 4%, or 1 to 10%.

[0033] The oral care composition can optionally include at least one orally acceptable source of fluoride ions. Any known or to be developed in the art may be used. Suitable sources of .fluoride ions include fluoride, monofluorophosphate and fluorosilicate salts. Specific examples include stannous fluoride, sodium fluoride, potassium fluoride, sodium monofluorophosphate, sodium fluorosilicate, ammonium flttorosi Skate, amine fluoride, ammonium fluoride, and combinations thereof. One or more fluoride ion-releasing compound is optionally present in an amount providing a total of about 100 to about 20.000 ppra, about 200 to about 5,000 pp , or about 500 to about 2,500 ppm, fluoride ions. Fluoride ion sources may be added to the compositions of the invention at a level of about 0.01 wt% to about 10 wt% in one embodiment or about 0.03 wt% to about 5 vvt.%, in another embodiment about 0.1 to about 2 wt%, in another embodiment about 0.1 to about 1 ,5 wt¾, and in another embodiment about 0.1 wt. % to about 1 wt, % by weight of the composition in another embodiment. Weights of fluoride salts to provide the appropriate level of fluoride ion will obviously vary based on the weight of the counter ion in the salt.

[9034) The compositions of the invention may also comprise various dentifrice ingredients to adjust the rheobgy and feel of the composition such as humeciants, surface active agents, thickening or gelling agents, etc.

[O035J The compositions of the present invention may comprise a surface active agent (surfactant). Suitable surfactants include without limitation water-soluble salts of C^o alky! sulfates, sulfonated monoglycerides of g-jo fatty acids, sarcosinates, tartrates, sodium laury! sulfate, sodium cocoyl monoglyceride sulfonate, sodium lauryl sarcosinate, sodium lauryl isoetliionate, sodium !aureth carboxylate and sodium dodecyl benzenesulfonate, and cocoamidopropy 1 beiai ne.

[0036) The compositions of the present, inventio optionally comprise a thickener. Any orally acceptable thickening agent can be used, including without limitation earbomers, also known as carhoxyvinyl polymers, carrageenans, also known as Irish moss and more particularly - carrageenan (iota-carrageenan), high molecular weight polyethylene glycols (such as CARBO AX®, availahle from The Do Chemical Company), cellulosic polymers such as hydroxyethykellulose, carboxymefchylcellulose (CMC) and salts thereof, e.g., CMC sodium, natural gums such as karaya, xanthan, gum arable and tragacanth, colloidal magnesium aluminum silicate, and colloidal and/or fumed silica and mixtures of the same. One or more thickening agents are optionally present in a totai amount of about 0.1 % to about 90%, for example about 1% to about 50% or about 5% to about 35%.

[0037) In various preferred embodiments, the compositions may comprise polymers and/or copolymers of polyethylene glycol, of ethylene oxide / propylene oxide, and of silicone. If such copolymers polymers are used, they may be selected from commercially available materials, i one embodiment such block copolymer is an ethylene oxide, propylene oxide block co-polymer of formula (ethylene oxide)_x~(propylene oxide)_v wherein x is an integer of 80- 1.50, e.g. 100-130, e.g. about J 18, and y is an integer 30-80, e.g. about 60-70, e.g. about 66, having an average molecular weight of greater than 5000, e.g., 8000 - 13000 Da, e.g. about 9800. Block copolymers of ethylene oxide / propylene oxide are useful, but higher molecular weight, e.g., > SOOODa are preferred, e.g. including PLURACARE® LI 220 (available from BASF, Wyandotte, Mich., United States of America). Low or medium molecular weight polyethylene glycol, e.g., PEG 400, PEG 600, PEG 80 , PEG 1000 and mixtures thereof are also useful.

{0038} It is preferred that the carrier(s) provide dentifrice with a viscosity of about 1 ,00 CPS to about 700,000 CPS, preferably about 30,000 CPS to about 300,000 CPS.

100391 As recognized by one of skill in the art, the oral compositions of the present invention optionally include other materials, such as for example, anti-caries agents, desensitizing agents, viscosity .modifiers, diluents, surface active agents, such as surfactants, emulsifiers, and foam modulators, pH modifying agents, abrasives, in addition to those listed above, humectants, mouth feel agents, sweetening agents, flavor agents, colorants, preservatives, and combinations thereof. It is understood that while general attributes of each of the above categories of materials may differ, there may be some common attributes and any given material may serve multiple purposes within two or more of such categories of materials. Preferably, the carrier is selected for compatibility with other ingredients of the composition.

|0040| F!avorants, sweeteners, colorants, foam modulators, mouth-feel agents and others additive^'ly may be included if desired, in the composition.

{0041 The compositions of the present invention optionally comprise one or more further active material (s), which is operable for the preventioa or treatment of a condition or disorder of hard or soft tissue of the oral cavity, the prevention or treatment of a physiological disorder or condition, or to provide a cosmetic benefit.

{0042} The compositions may include stannous ion or a stannous ion source. Suitable stannous ion sources include without limitation stannous fluoride, other stannous halides such as stannous chloride dihydrate, stannous pyrophosphate, organic stannous carboxylase salts such as stannous formate, acetate, gluconate, lactate, tarttaie, oxalate, malonate and citrate, stannous ethylene glyoxide and the like. One or mote stannous ion sources are optionally and illustratively present in a total amount of about 0.01% to about 1.0%, for example about 0.1% to about 7% or about 1% to about 5%. |ft043| The compositions of the present invention optionally comprise an antimicrobial (e.g., antibacterial) agent. A further illustrative list of useful antibacterial agents is provided in such as those listed U.S. Pat. No. 5,776,435 to Gaffar et al, the contents of which are incorporated herein by reference. One or more antimicrobial agents are optionally present in an antimicrobial effective total amount, typically about 0.05% to about 10%, for example about 0.1% to about

{0044) The compositions of the present invention optionally comprise an antioxidan t. Any orally acceptable antioxidant can be used, including butylated hydroxyanisole (BHA), butylated hydroxytoluene (BUT), vitamin A, carotenoids, vitamin E, tlavonoids, polyphenols, ascorbic acid, herbal antioxidants, chlorophyll, melatonin, and mixtures thereof,

{0045) The compositions of the present invention optionally comprise a sialagogue or saliva- stimulating agent, an antiplaque agent, an aiUi-i.nfJammato.ry agent, and/or a desensitizing agent.

[6046] pH modifying agents among those useful herein include acidifying agents to lower pH, basifying agents to raise plL and buffering agents to control. pH within a desired range. For example, one or more compounds selected from acidifying, basifying and buffering agents can be included to provide a pH of 2 to 10, or in various embodiments from 2 to 8, from 3 to 9, from 4 to 8, from 5 to 7, from 6 to 10, and from 7 to 9. Any orally acceptable pH modifying agent can be used, including without limitation carboxylic, phosphoric and sulfonic acids, acid salts (e.g., monosodium citrate, disodium citrate, monosodium malate, etc.), alkali metal hydroxides such as sodium hydroxide, carbonates such as sodium carbonate, bicarbonaies, sesquicarbonates, borates, silicates, phosphates (e.g., monosodium phosphate, trisodium phosphate, pyrophosphate salts, etc.), imidazole and mixtures thereof. One or more pH modifying agents are optionally present in a total amount effective to maintain the composition in an orally acceptable pH range.

{0047| While ingredients are sometimes identified herein by category, e.g., humectant, antioxidant, thickener, etc., this identification is for convenience and clarity, but is not intended to be limiting. All of the ingredients in the compositions may have functions in addition to their primary function, and may contribute to the overall properties of the composition, including its stability, efficacy, consistency, mouthfeeS, taste, odor and so forth.

{0048) The product form of the compositions of the invention can be a dentifrice, mouthrinse, strip, or gel. The term "dentifrice" generally denotes formulations which are used to clean the surfaces of the oral cavity. The dentifrice is an oral composition that is not intentionally swallowed for purposes of systemic administration, of therapeutic agents, but is applied to the oral cavity, used to treat the oral cavity and. then expectorated. Typically the dentifrice is used in conjunction with a cleaning implement such as a toothbrush, usually by applying it to the bristles of the toothbrush and then brushing the accessible surfaces of the oral cavity. Preferably the dentifrice is in. the form of a paste or a gel (or a combination thereof).

f O049| Methods are provided to whiten a tooth surface in a human or animal subject comprising contacting a composition of the invention, e.g.. Composition 1, et seq.. as described above, and with the tooth surface. In one embodiment the composition remains stable when stored for at least i week, at least 2 weeks, at least 1 month, at least 3 months, at least 6 months, or at least 1 year prior to contacting with the tooth surface. In one embodiment the composition is stored at room temperature. As used herein "animal subject" includes higher order non-human mammals such as canines, felines, and horses. The oral care composition is contacted with an oral surface of the mammalian subject to thereby whiten teeth in a highly efficacious manner, without any negative interaction between the whitening agent; the blue to blue-violet pigment, and other ingredients,

(00501 i various embodiments, it is preferred that the oral care composition is applied and contacted with the oral surface. The dentifrice, prepared in accordance with the present invention is preferably applied regularly to an oral surface, preferably on a daily basis, at least one time dail for multiple days, but alternately every second or third day. Preferably the oral, composition is applied, to the oral surfaces from 1 to 3 times daily, for at least 2 weeks up to 8 weeks, from four months to three years, or more up to lifetime.

[0051 J The compositions of the invention can be packaged into containers or dispensers known in the art. via means conventional in the art. In some embodiments the compositions are packaged into tubes, metal, plastic or laminated, with either screw top or flip top caps.

(0052| in some embodiments, the diameter of the top of the tube in whic the a composition of the present invention is packaged, expands less than 0.1 em, after I week of aging at 60°C. While in other embodiments, the diameter of the top of the tube in which a composition of the present invention is packaged, does not expand to a measurable extent.

{00531 In some embodiments, the compositions of the present invention do not exhibit an unacceptable level of phase .separation, e.g., after 30 .minutes at 2050 rpm in a LumiSizer 11 analytical centrifuge . |ft054| The invention is illustrated in the following non- limiting examples.

EXAMPLES

Comparison of various compositions

The forraulations are generally described in Table I

Fable 1

The formulation ingredients are shown m Table 2

Table 2

Sodium lauryl sulfate 2 2 2 X

sodium saccharin X

sorbitol X

Tetrasodium Pyrophosphate ?

trisodi urn phosphate X

Water 0 0 0 X

Color stability measuring procedure:

|0GS5J Calibrate the colorimeter. Add toothpaste samples of Formulations A-D to an appropriate cuvette. Measure the color to obtain the baseline measurements Add aged (1 week in 60°C) sample formulations to a cuvette and measure color. Add aged (2 week in. 60°C) sample formulations to a cuvette and measure the color. Evaluate change in L* ( L* of 100 -lightest, L*~Q is darkest).. Compare sample final change in L*.

In- v i tro Br j shin Pr o edur e

(00561 Prophy artificially stained bovine enamel to achieve similar initial lightness values. Mount bovine teeth into a tray. Prepare 1 : 1 w/w) slurry of dentifrice to Dl water and add 25 grams to brushing tray. Brush the stained bovine teeth for 2 .minutes at 120 strokes/mm. Rinse teeth with 100 ml Dl water then evaluate teeth for L*,a*,b* values with spectrophotometer ("in vitro brushing"). The teet are then soaked in Dl water for 1 hr with agitation and then evaluated for L*,a*,b* values with spectrophotometer to measure the amount of blue retained ("in vitro retention").

[0057| Spectrophotometer Metrics

CIELAB color scale is used.

b* value: +b* - yellow and -b* = blue

AWIO - Optimized version of the C1E whiteness index f0058| Two toothpaste formulas, one containing peroxide and Pigment Blue 15 and another containing peroxide and blue dye (FD&C blue are aged for two weeks in a 6Ό^&€ oven and the peroxide stability is analysed. Table 3 shows the analytical results of aged low peroxide toothpaste with pigment blue vs a low peroxide with blue dye showing degradation of peroxide. The results from Table 3 indicate a significant loss of peroxide active in toothpaste containing blue dye as compared to dentifrice containing Pigment blue.

{0059) Table 3 shows the in- vitro brushing results of low peroxide toothpaste with pigment blue vs. a commercial instant whitening toothpaste. The results from Table 3 indicate the low peroxide formula with pigment bine provides more whitening and change of blue on the tooth surface than a commercial instant whitening product after only one application of the produc t {0060) Table 3 shows the in-vitro retention results of low peroxide toothpaste with pigment blue vs. a commercial instant whitening toothpaste. The results indicate the product containing low peroxide and pigment blue is better at retaining blue on the surface of teeth than a commercial i stant whitening product,

(00611 Table 4 shows the in-vitro brushing results of low peroxide toothpaste with pigment blue vs. a toothpaste without colorant. The results indicate the product containing low peroxide and pigment blue is more whitening and change of blue on the tooth surface than the product withoot pigment after only one application of the product.

Table 3

fable 4

Claims

WHAT IS CLAIMED IS:

1. A dentifrice composition comprising (i) a whitening complex comprising erossKnked polyvinylpyrrolidone completed with hydrogen peroxide, and (ii) a pigment having a blue to lue- violet color with a hue angle in the€ IE LAB system ranging from 200 to 320 degrees.

2. The composition of claim 1 further comprising an ethylene oxide, propylene oxide block co-polymer of average molecular weight greater than 5000 Da.

3. The composition of claim 2 wherein the ethylene oxide, propylene oxide block: copolymer comprises (ethylene oxide)_x-(propylene oxide)_y wherein x is an integer of 80-150 and y is an integer 30-80,

4. The composition of any of the preceding claims wherein the wh iteni ng complex contains about 10-30% hydrogen peroxide, by weight, and about 5-15% total nitrogen by weight.

5. The composition of any of the preceding claims wherein the total amount of hydroge peroxide by weight of the composition is about 0.05 to 4% by weight,

6. The composition of any of the preceding claims wherein the amount of pigment is about 0.01 to 3% by weight,

7. The compositio of any of the preceding claims wherein the pigment has a hue angle in the CIELAB system ranging from 250 to 290 degrees.

8. The composition of any of the preceding claims additionally comprising polyethylene glycol of average molecular weight 400 to 800 Da.

9. The composition of any of the preceding claims which contains less than 3% water,

10. The composition of any of the preceding claims which is a toothpaste comprising a

calcium abrasi ve selected from a calcium phosphate salt, calcium carbonate, or calcium pyrophosphate.

1 1 . The composition of any of the preceding claims further comprising tetrasodiun

pyrophosphate.

12. The composition of any of the preceding claims comprising the following ingredients by weight:

Glycerin 10-60 wt% 1

Propylene glycol 0.01-60 wt%

Ethylene oxide, propylene oxide block 6^"ο ~ϊ5% j co-polymer, avg, MW >5kDa

Cross linked poly vinyipyrrolidone 0.05-25 wt%

completed with 15-25% hydrogen

peroxide

Pigment having a hue angle in the 0.02-1 wt%

CIELAB system ranging from 250 to 290

degrees.

Calcium pyrophosphate 0.01-45 wt% j

TSPP and/or SAPP 0.01 -5 wt% j . The composition of any of the precedin g claims comprising additional linear and/or crosslinked polyvinylpyrrolidone.

1, The composition of claim 12 comprising:

Glycerin 20-50 wt% j

Propylene glycol 5-25 wt% j

Ethylene oxide, propylene oxide block 5-12 %

co-polymer, avg. MW >5kDa

Additional linear and/or crosslraked 1 -10 wt%

poiyvinyipyrroHdone

Cross linked polyvinylpyrrolidone 0.25-10 wt%

compiexed with 15-25% hydrogen

peroxide

Pigment having a hue angle in the 0.01-0.08 wt%

CIELAB system ranging from 250 to 290

degrees.

Calcium pyrophosphate 5-30 wt% j

TSPP and/or SAPP 0.1 -5 wt% j

15. A method for whitening a tooth surface in a human or animal subject comprising contacting a composition of any of the preceding claims with the tooth surface.