MXPA05011742A - Novel gum delivery systems - Google Patents

Abstract

A substrate having about 0.5 wt%to about 25 wt%gum incorporated upon it is provided that provides the benefit of delayed viscosity when incorporated into a person care composition such as a toothpaste. Also disclosed is a method for forming gum incorporated onto or into a substrate comprising the steps of:providing a substrate;introducing a liquefied solution of gum to the substrate;and optionally drying the gum-treated substrate to form a dried gum-treated substrate. The invention further includes a dentifrice comprising a gum- -treated substrate, and one or more ingredients selected from the group consisting of humectants, abrasives, thickening agents, binders, stabilizing agents, antibacterial agents, fluorides, sweeteners, and surfactants.

Description

NOVEDOSOS SYSTEMS FOR RUBBER SUPPLY BACKGROUND OF THE INVENTION In the manufacture of consumer products, such as toothpaste, rheology control agents, such as gums, are often used for a number of different reasons, such as providing a gelatinous structure that stabilizes the toothpaste against separation from the toothpaste. phase, as well as providing firmness and extrudability to the pasta, and improved mouthfeel. However, although it is highly functional in a toothpaste formulation, the use of these gums creates numerous manufacturing difficulties. Notably, adding rubber agents can cause non-uniform dispersion, bringing with it high levels of dust and causing granularity. These problems can be faced by sufficiently hydrating the gums, but this hydration can be a time-consuming process, which results in a significant reduction in toothpaste production rates. Still another difficulty, is that the combination of gums with certain ingredients of the toothpaste, such as humectants, abrasives and thickeners, results in a substantial degree of viscosity, which is obtained as soon as these ingredients are mixed together. In fact, the viscosity on the 200,000 cps scale is not uncommon, which can in itself cause numerous problems for the performance of the toothpaste plant. These problems include: (1) longer mixing times associated with the difficulty of mixing the abrasive or the thickener in the viscous base for toothpaste; (2) the creation of lumps in toothpaste as a result of high viscosity and inadequate shear stress; and (3) the difficulty of mixing the dry powder formulation in a highly viscous toothpaste base. Accordingly, the manufacturing process can be adjusted itself, in order to make adjustments for the aforementioned problems. For example, the extruders of filtering head for toothpaste (which eliminate the lumps and the air that it contains), must be installed and operate under high pressures, due to the viscosity of the toothpaste. Additionally, the filling time of the toothpaste tube becomes slow due to the high viscosity and the significant pressure needed to push the viscous product into the tubes. Thus, the initial viscosity of the toothpaste results in an increased mixing time, increased time to extrude the product, and an increased time to fill the tubes. These problems can still be exacerbated when the toothpaste can not be added to the tubes immediately, and the toothpaste should settle in a container for an extended period of time, allowing the toothpaste's viscosity to continue to rise, eventually causing the tubing of the product and the cleaning of the container are more difficult.

Given the above, there is a need to develop a method for supplying gum in a consumer product formulation (e.g., in the form of a rubber-treated substrate) to be applied to the gum dispersion and the hydration time, as well as the problems of high viscosity to make toothpaste compounds, and therefore, allow for improved performance and increased production rates.

BRIEF DESCRIPTION OF THE INVENTION The invention includes a substrate having from about 0.5 percent by weight to about 25 percent by weight of incorporated gum. The invention also includes a method for forming gum incorporated on or in a substrate, comprising the steps of: providing a substrate; introduce a liquefied solution of gum to the substrate; and optionally, drying the rubber-treated substrate, to form a dry substrate treated with rubber. The invention also includes a dentifrice containing a gum-treated substrate, and one or more ingredients selected from the group consisting of humectants, abrasives, thickening agents, binders, stabilizing agents, antibacterial agents, fluorides, sweeteners and surfactants.

DETAILED DESCRIPTION OF THE INVENTION All parts, percentages and proportions used here are expressed by weight, unless otherwise specified. All documents cited here are incorporated by reference. What follows describes preferred embodiments of the present invention, which provides a toothpaste prepared with delayed viscosity, using rubber-treated substrates. Although the optimal use for this rubber-treated substrate is in toothpastes, it can also be used in a variety of other products for consumption. By "coated" it is meant that the specified coating ingredient covers at least a portion of the outer surface of a particle or substrate. By "mixture" is meant any combination of two or more substances, in the form of, for example, without pretending to be limiting, a heterogeneous mixture, a suspension, a solution, a colloidal dispersion, a gel, a dispersion or a emulsion By "toothpaste" we mean oral care products, such as toothpastes, dental powders, chewing gums and toothpastes, without pretending to be limiting. By "rubber" is meant any poly isacid or derivative thereof that will hydrate in water to form viscous solutions, d ispersions or gels.

By "liquefied" it is meant to put in a liquid state, either by melting or by solubilization in a solvent such as water. By "storage period" of a product, it is meant the period of time between (a) the completion of the manufacture of the product, and (b) the first use of the product by the consumer. By "storage" is meant any manufacturing steps (including mere storage) during the period of time between (a) the completion of the manufacture of the product, and (b) the first use of the product by the consumer. The present invention relates to a gum-treated substrate, for personal care products, which provides rapid dispersion of rubber thickeners or gum binders in finished consumer products, such as personal care products, foods, products pharmaceuticals, and cosmetics, without pretending that they are limiting. The rubber-treated substrate is particularly useful in dentifrices such as toothpastes. For the embodiments of this gummed substrate in which the gum is impregnated into a porous substrate (discussed in more detail below), the particular advantage of delaying the formation of viscosity is offered, such that the composition for personal care can be processed more easily. For example, toothpastes containing gum-treated substrates, in which gum is impregnated in the substrate, have a delayed viscosity formation of about 20,000 cps, about one-tenth of the viscosity value that would be expected. Due to this low initial viscosity, certain processing difficulties, such as long mixing times to incorporate dry powders, formation of lumps in the toothpaste due to high viscosity, long times of high pressure extrusion, and slow filling of the tube , they can be avoided. By avoiding these processing difficulties, the production rates in dentifrice manufacturing facilities may increase, while the investment costs for new facilities may be reduced because it is no longer necessary to install equipment to provide great pressures in order to process high viscosity toothpaste. The rubber-treated substrate itself is a mixture of at least one substrate and a rubber thickener or rubber binder. Preferably, a thickener or binder of liquefied gum (dissolved or molten) is impregnated on a porous substrate, or alternatively, coated on a non-porous substrate. Any suitable porous or non-porous substrate can be used. When adding gum in the form of a rubber-treated substrate, the gum disperses quickly and evenly in the product formulation. Supply times are shortened dramatically, grinding is not experienced, mixing times are significantly reduced, the time required to process the product through a filtering head extruder is greatly reduced, less product is lost in the lumps collected in the extruder of filtering head, and lower levels of dust are experienced than when handling gums in their dry form. The use of a substrate to supply the gums in a dry form also eliminates the time and expense associated with the use of a "preparation" and delivery system in which the gums dissolve in water before use. As described above, the additional benefit of delayed viscosity formation can be noticed when the gum is impregnated in the substrate. This delayed viscosity occurs because when the gum is impregnated in a porous substrate, the gum does not initially react with. the other components of the product for consumption (such as a toothpaste), and it takes time for the gum to migrate out of the pores of the substrate and to the toothpaste, such that the initial viscosity of the product remains relatively low, and therefore, the product can be easily processed. The lower viscosity has a significant effect on every aspect of processing: mixing times are shorter, pumping rates can be increased, filtration / extrusion rates increase significantly, and packing rates increase dramatically. All these improvements result in an increase in the capacity of the plant. Over time, the rubber migrates from the pores of the substrate to the product, so that the product gradually obtains the desired level of viscosity in its final packaged form. The aging times can be regulated, to produce the desired delayed viscosity over a period of time, varying several different parameters, such as: the level of loading of the gum in the substrate, the amount of substrate incorporated in the formulation, and the type rubber. As mentioned above, the present invention relates to a gummed substrate that includes at least two components: a substrate and a gum. The substrates can be any finely divided, insoluble material in water, preferably with an average particle size from 1 μm to about 850 μ (lattice 20), which has approximately the smallest size visible to the normal eye, more preferably from about 5 μm. μm to approximately 15 μm. Larger particle sizes may also be used, provided they are not objectionable to the aesthetics of the formulation, such as in formulations for facial exfoliation, where large, visible abrasives are preferred. The substrate used is limited only by its compatibility with the formulation in which it is supplied. For example, CMC can be supplied to a batch of toothpaste by dicaceous phosphate dihydrate, TiO2, alumina, sodium aluminosilicate, PCC, GCC, clay, or silica, since all of these substances are commonly found in cream formulations. dental Similarly, CMC can be supplied on a peach seed powder or nut shell powder substrate in formulations for facial exfoliation, and on foods on a silica, species or grain substrate. The substrate may be porous or non-porous. Preferred non-porous substrates include dicalcium phosphate dihydrate and calcium carbonate abrasives, opacifier or titanium dioxide dye. As for the porous substrate, preferred materials include precipitated amorphous silica, silica gel or sodium aluminosilicate. With regard to especially the silicas, silica of dental grade (silica amorphous precipitate, silica gel, or silicon dioxide) and sodium aluminosilicate mentioned above have a porous structure capable of absorbing significant quantities of liquids, while still retain their dry character, free of flow. These silicas or silicates can have relatively high absorption capacity (thickener grade silicas) or relatively low absorption capacity (abrasive grade silicas). As mentioned above, the rubber thickening agents are useful in the dentifrice compositions of the present invention, to provide a gelatinous structure that stabilizes toothpaste against phase separation, to provide firmness and extrudability to the toothpaste, and sensation in toothpaste. the mouth improved. Commercially, they are usually referred to as thickeners, binders or stabilizers, and are classified as natural or modified. Any suitable gum can be used for use in toothpaste, provided it can be taken in solution or melted, to allow incorporation into the pores of silica. Natural gums include carrageenan, tragacanth gum, karaya gum, gum arabic, ghatti gum, acacia gum, locust bean gum, sodium alignate, xylaria extracts, plant exudates, seed or root gums, and those obtained by microbial fermentation, such like xanthan gum. Modified gums include cellulose, starch derivatives, and certain synthetic gums such as low methoxyl pectin, polyethylene glycol (PEG), propylene glycol, carboxymethyl, hydroxyethyl, hydroxypropyl, hydroxymethyl-carboxyethyl, hydroxymethyl-carboxypropyl, methyl, ethyl and sulphated cellulose, and guar gum. Lists of gums used in cosmetic products are provided in the International Cosmetics Dictionary and Handbook, Seventh Edition, CTFA, Washington, DC, 1997; in food and food products in The Code of Federal Regulations, Title 21 (21 CFR), particularly in sections 172, 184 and 582, and for pharmaceutical products, in United States Pharmacopeia and National For ulary (USP25 / NF20), U.S. Pharmacopeial Convention, Inc., Rockville, Maryland, 2002, which are incorporated in the present application by reference. Preferred gums include Viscarin carrageenan-based products, available from FMC Biopolymers, Rockland, Maine, carboxymethylcellulose-based products, available from Hercules Corporation, Wilmington, Delaware, and Noviant, Inc, Mijmegen, The Netherlands, and xanthan-based products, available from Jungbunziauer, Basel, Switzerland, and Rhodia Corporation, Cranbury, New Jersey. As in the process of making the rubber-treated substrate of the present invention, preferably the gum component is liquefied by dissolution in water or by melting, and then absorbed into the substrate portion of the formulation. Then the substrate is dried, if necessary to remove the introduced water, leaving behind a gum, which is now a solid and resides in the pores of the substrate. Specifically, in this process a gum is liquefied by adding the gum to the water at a concentration of about 0.1 percent by weight to about 20 percent by weight, preferably from about 0.5 percent by weight, to about 10 percent by weight, and heating the mixture from about 20 ° C, to about 95 ° C, preferably from about 70 ° C to about 90 ° C, until the gum is solubilized. Alternatively, the gum is liquefied by heating the gum to a temperature high enough to melt the gum, but not so high as to carbonize the gum. The temperature used will depend on the melting point of the rubber chosen. The liquefied gum is then slowly added to a substrate, with agitation, for a period of about 5 to 10 minutes in a heated mixer, in an amount that provides from about 5 weight percent to about 30 weight percent, preferably about 20 percent by weight, up to about 25 percent by weight of gum on the substrate. The hot mixer is maintained at a temperature sufficient to maintain the gum in a liquefied state, but not so high as to carbonize the gum. The actual addition time of the rubber depends on the size of the batch prepared. Next, the rubber-treated substrate is optionally dried to remove excess water, at a temperature generally not higher than 105 ° C. Again, the drying temperature depends on the particular rubber used. For example, substrates treated with xantan and CMC can be dried at 105 ° C without carbonization, while the substrate treated with carrageenan gum is dried at about 75 ° C, since it is carbonized at 105 ° C. No drying is required when the gum has been melted or when the gum-water solution is added at a rate sufficient to maintain the substrate in a dry and freely flowing state. The resulting product can be treated multiple times with the gum solution. The final product can be lightly ground and sieved to eliminate lumps. The rubber-treated substrate can then be incorporated into a consumer product, such as a dentifrice composition, for example, a toothpaste. When used in a dentifrice or toothpaste, the gummed substrate serves as a thickening agent (which is sometimes also known as a binder or stabilizing agent), or a thickener / abrasive combination. Along with the additive, the toothpaste or toothpaste may also contain various other ingredients, such as abrasives, other thickeners, humectants, antibacterial agents, fluorides, flavors, sweeteners, and co-surfactants. Abrasives impart improved cleaning and abrasive characteristics, when they are included in a toothpaste or toothpaste. Abrasives clean the teeth by removing waste and residual stains, and they work as a polish for the surfaces of the teeth. Precipitated silicon dioxide, silica gel, precipitated calcium carbonate, ground calcium carbonate, chalk, sodium aluminosilicate and dibasic calcium phosphate dihydrate are examples of abrasives used in dentifrices. a sufficient amount of abrasive to a cream composition in such a manner that the dentin radioactive abrasion (RDA) value of the toothpaste is between about 50 and 200. Appropriate abrasives can generally be added at a level of about 5 times percent by weight up to about 50 percent by weight. Optionally, additional thickeners (binders) can be incorporated in the toothpaste. This is particularly the case when the rubber-treated substrate is not a silica or silicate grade thickener. These additional thickeners provide the dentifrice formulation, firmness, body, mouth feel and thixotropy. The binders may be selected from inorganic thickeners such as precipitated silica, silica airgel, pyrogenic silica, silicate clays and colloidal magnesium aluminum silicate, and synthetic organic polymers, such as polyacrylates and polyvinylpyrrolidone, and mixtures thereof. These binders generally contain about 5 percent to about 10 percent, by weight, of the formulation. Moisturizers serve to add body or "texture in the mouth" to a toothpaste, as well as to prevent the toothpaste from drying out. Suitable humectants include glycerin (glycerol), sorbitol, polyalkylene glycols, such as polyethylene glycol, and polypropylene glycol, hydrogenated starch hydrolysates, xylitol, erythritol, mannitol, lactitol, hydrogenated corn syrup, and other edible polyhydric alcohols, used alone or as mixtures of them. Suitable humectants can generally be added at a level of from about 15% to about 70%. Suitable antimicrobial agents (cationic, anionic and nonionic) are contemplated by the invention. Antimicrobial agents can be included to reduce the presence of microorganisms to below levels that are known to be harmful. Suitable antimicrobial agents include bisguanides, such as alexidine, chlorhexidine and chlorhexidine gluconate; quaternary ammonium compounds, such as benzalkonium chloride (BZK), benzethonium chloride (BZT), cetylpyridinium chloride (CPC), and domiphene bromide; metal salts, such as zinc citrate, zinc chloride, and stannous fluoride; sanguinary and sanguinarine extract; volatile oils, such as eucalyptol, menthol, thymol, and methyl salicylate; amine fluorides; peroxides and the like. The therapeutic agents can be used in dentifrice formulations alone or in combination. If present, the level of the antimicrobial agent is preferably from about 0.1 percent by weight to about 5 percent by weight of the toothpaste composition. Optionally, flavoring agents can be added to the dentifrice compositions. Suitable flavoring agents include oil of wintergreen, peppermint oil, peppermint oil, sassafras oil, and clove oil, cinnamon, anisole, menthol, and other similar flavoring compounds to add fruit notes, spice notes, etc. These flavoring agents consist chemically of mixtures of aldehydes, ketones, esters, phenols, acids and aliphatic, aromatic and other alcohols. Sweeteners can be added to the toothpaste composition to impart a pleasant taste to the product. Suitable sweeteners include saccharin (such as sodium, potassium, or calcium saccharin), cyclamate (such as sodium, potassium, or calcium salt), acesulfame-K, thaumatin, neohisperidin dihydrochalcone, ammoniated glycyrrhizin, dextrose, levulose, sucrose, mannose, and glucose . Flavoring and sweetening agents are generally used as dentifrices at levels from about 0.005 percent to about 2 percent by weight. The toothpaste will also preferably contain fluoride salts to prevent the development and progression of dental caries. Suitable fluorine salts include partner fluoride, potassium fluoride, zinc fluoride, stannous fluoride, zinc ammonium fluoride, sodium monofluorophosphate, potassium monofluorophosphate, laurylamine hydrofluoride, diethylaminoethyloxylamide hydridohydrate, didecyldimethylammonium fluoride, cetylpyridinium fluoride, dilaurylmorpholinium fluoride, stannous sarcosine fluoride, potassium glycine fluoride, glycine hydrofluoride, and sodium monofluorophosphate. Typical levels of fluoride salts are from about 0.1 percent by weight to about 5 percent by weight. Surfactants may also be included as additional cleansing and foaming agents, and may be selected from anionic surfactants, zwitterionic surfactants, nonionic surfactants, amphoteric surfactants, and cationic surfactants. Anionic surfactants are preferred, such as sulphated metal salts, such as sodium lauryl sulfate. The dentifrices described herein may also have a variety of additional ingredients, such as desensitizing agents, healing agents, other caries preventive agents, chelating or inhibiting agents, vitamins, amino acids, proteins, other anti-plaque or anti-calculus agents, opacifiers, antibiotics, anti-enzymes, enzymes, pH control agents, oxidizing agents, antioxidants, bleaching agents and preservatives. Finally, in the case of a toothpaste or toothpaste, the water provides the rest of the composition in addition to the aforementioned additives. The water is preferably deionized and free of impurities. The dentifrice will generally contain from about 5 percent to about 60 percent water, preferably from about 5 percent to about 20 percent by weight of the toothpaste compositions. The invention will now be described in greater detail with respect to the following specific examples, not limiting.

EXAMPLE 1 In Example 1, a substrate treated with gum suitable for use in dentifrices was prepared according to the present invention, as well as other products for fast gum dispersion and delayed viscosity production, and gum containing carrageenan, and a precipitate of silica thickeners. Specifically, 100% Viscarin® gum solution with carrageenan was prepared by adding 75 grams of Viscarin 389 gum available in FMC Biopolymers to 675 ml of water, mixing and heating the mixture at 88 ° C, until all the Gom to dissolve. In a Hobart mixer vessel heated to 85 ° C, 300 g of the gomad solution to Viscarin was added with mixing at a rate of 38 ml / min for 7.8 minutes to 200 g of Zeodent® 165 thickened precipitated silica. , available in JM Huber Corporation. The resulting product was dried at 85 ° C in a Fisher 400 Series Isotemp furnace, to remove excess water. Silica Zeodent 165 contained 13% by weight of Viscarin gum, on a dry basis within its pores.

EXAMPLE 2 In example 2, a gum solution was prepared Viscarin 389 at 5%, adding 60 grams of Viscarin 389 gum to 1140 grams of water, mixing and heating the mixture at 49 ° C, until all the gum was dissolved. The solution was heated to 85 ° C and then 250 g to 200 g of Zeodent® Silica Thickener 165 was added with mixing in a Hobart mixer vessel heated at 85 ° C for a period of 10 minutes. The silica was allowed to mix at 85 ° C and then additional solution was added very slowly over a period of 5 hours. The addition rate was adjusted to coincide with the evaporation rate so that the powder always remained free flowing. The addition of total gum solution to the 200 g of silica was 1200 g. The product resulting from Example 2 was calculated to contain 22.2 percent by weight of Viscarin 389 on a dry basis in its pores. To demonstrate its efficacy in consumer products, examples 1 and 2 were incorporated as powders in two different toothpaste compositions (number 1 and 2), which are specified in Table I, below. The performance of these compositions was compared with the performance of the following control toothpaste compositions: Composition 3, with Viscarin 389 silica and rubber content added separately to the toothpaste composition; Composition 4, without rubber content Viscarin and silica; Composition 5, with Viscarin 389 rubber content, but without silica; and Composition 6, with silica content, but without Viscarin gum. The amounts of ingredients used in these formulations are given in Table I, below. These samples of toothpaste were prepared as follows. For compositions 3 and 5, a first mixture was formed by combining glycerin and carrageenan gum Viscarin 389, and then stirring the first mixture until the components were dissolved. (Note that this first mixture is not formed in the preparation of compositions 1 and 2, because in these compositions, Viscarin gum is absorbed in the silica, neither is it necessary for compositions 4 and 6, because they do not contain gum Viscarin). Then a second mixture was formed by combining the following ingredients in sequence: de-ionized water, tetrapotassium pyrophosphate, sodium saccharin, sodium monofluorophosphate, and then stirring until the components were dissolved. The first and second mixes were then combined while stirring, to form a "pre-mix". For compositions 1, 2, 4 and 6, only the second mixture applies and serves as pre-mix. The pre-mix was placed in a Ross mixer (model 130 LDm, Charles Ross &Co, Haupeauge, NY). Dibasic calcium phosphate dihydrate abrasive, and Zeodent 165 silica thickener (compositions 3 and 6), or the gum-containing silicas prepared according to examples 1 and 2 (compositions 1 and 2) were added., to the pre-mix, and the mixture was mixed without vacuum. Note that compositions 4 and 5 do not contain silica thickener, so only dibasic calcium phosphate was added. Then, 76 cm of vacuum was applied and each toothpaste composition was mixed for 15 minutes, and then sodium lauryl sulfate and flavor were added. The resulting mixture was stirred for 5 minutes at a reduced mixer speed. The prepared toothpaste composition was sealed in plastic toothpaste tubes for storage and future testing. The six different compositions for toothpaste contained the ingredients in the amounts given in grams in Table I, below.

TABLE I COMPOSITIONS FOR DENTAL CREAM After preparing compositions 1 to 6, as above, viscosity measurements were made in each as follows. The viscosity of the toothpaste was measured using a Brookfield Synchro-Lectric viscometer model RVT, with Helipat Stand Model D. All measurements were made with TF axis at 5 rpm, at a temperature of 25 ° C. The initial viscosity of each toothpaste composition was measured and then viscosity measurements were made at the following times: 24 hours, 48 hours, 72 hours, 1 week, 2 weeks and 3 weeks. The results of the Brookfield viscosity measurements are shown in Table I I, below. Viscosity units are expressed in cps x 104.

TABLE II VISCOSITY OF COMPOSITION IS FOR DENTAL CREAM MEDI DAS DURING 3 WEEKS The toothpaste compositions 1 and 2 contained the gum-treated silicas prepared in Examples 1 and 2, which were prepared in accordance with the present invention. As can be seen in Table I I, both offered a delayed viscosity formation in the toothpaste compositions. Compositions 1 and 2 had a lower initial viscosity, which allowed for easier processing of the toothpaste compositions, while providing a gradual or delayed increase in the viscosity of the finished toothpaste over time, until achieving a viscosity observed in the toothpaste. a toothpaste prepared in the conventional way. The toothpaste compositions 3 to 6 were control compositions that represented the prior art. The toothpaste composition 3 contained Viscarin 389 carrageenan gum, and Zeodent 165 precipitated silica, added to the formulation separately. Unlike the rubber-treated silicas of the present invention, used in positions 1 and 2, the toothpaste composition 3 had large viscosity values from the start, which resulted in difficulty in making the composition. Composition 4 did not contain Viscarin 389 gum or Zeodent 165 precipitated silica, resulting in a toothpaste with viscosity values that were much lower for toothpaste compositions. The toothpaste composition 5 contained Viscarin 389 carrageenan gum, but did not contain Zeodent 165 precipitated silica. The composition for toothpaste 6 contained Zeodent 165 precipitated silica, but not Viscarin 389 carrageenan gum. Both toothpaste compositions 5 and 6 had acceptable viscosity values; however, the initial viscosity of each composition was extremely high, which could present challenges for the formation of compounds avoided by the toothpaste compositions 1 and 2.

EXAMPLES 3 TO 10 In Examples 3 to 10, gum-treated substrates suitable for use in dentifrices, as well as other products for the rapid dispersion of gum were prepared in accordance with the present invention. In these examples, an aqueous solution of gum was prepared by adding the gum to water at 50 ° C and mixing. The hot gum solution was slowly added to a specified carrier, and mixed using a Kitchen Aid ProLine mixer (model KSMS). The resulting product was dried in a Fisher 400 Isotemp Series oven at 105 ° C, until a moisture content of less than 10% The dry product was then ground slightly, using a micro-spraying mill for Bantam-Mikro Type CF samples remove small lumps and reduce the dust that returns to the original particle size of the substrate used in the test.The powder is then sieved through a 20 mesh grid, down to a size of less than (850 μm) to ensure that all The gums used were gum xantan FS, available from Jungbunziauer, Aqualon CMC 7MXF, available from Hercules Corporation, and Viscarin 389 carrageenan gum, available from FMC Biopolymers.The substrates used were abrasive silica amorphous precipitate Zeodent 1 13 and Zeodent 165 amorphous precipitated silica thickener, and Zeodent 012 amorphous precipitated sodium aluminosilicate abrasive, all of which are available from JM Huber Corporation; Ground calcium carbonate (GCC) available from Omya Corporation, Superior, Arizona; S-grade titanium dioxide, available from American International Chemical, Natick, Massachusetts; and dicalcium phosphate dihydrate (DCPD) available from Rhodia Corporation, Cranbury, New Jersey. The amounts and types of ingredients used to prepare Examples 3 to 10 are given in Table III below.TABLE III PARAMETERS FOR THE EXAMPLES 3 TO 10 TABLE III - CONTINUATION After being prepared as set forth above, the rubber-treated substrates, from Examples 3 to 10, were subjected to rapid dispersion test. Three control powders were also included in the rapid dispersion test. Control 1 was Aqualon 7MXF carboxymethylcellulose (CMC) gum, available from Hercules, control 2 was xantan FS gum available from Jungbunziauer, and control 3 was Viscarin 389 carrageenan gum, available from FMC Biopolymers. Controls 1 to 3 were gums that did not contain substrate. The rapid dispersion test was performed by adding the test sample to a 70% sorbitol solution (Sorbo, from Ruger Chemical). The test was run at room temperature. A Lightnin laboratory mixer model MS 3000 running at 433 rpm, provided agitation. The sample for complete testing was added to the sorbitol solution at a delivery time of 60 to 90 seconds. A Syntron magnetic feeder, model FTO, controlled the delivery time. The sample and the sorbitol were mixed until no lumps appeared visually in the suspension. Then, the suspension was emptied onto a grating screen 20 (850 μm) to verify lumps. After 5 minutes, any lumps retained in the grating screen 29 were weighed. The results of the rapid dispersion test for examples 3 to 10, and the three controls, are contained in table IV, below.

TABLE IV SAMPLES FOR THE PROOF OF QUICK DISPERSION AND RESULTS TABLE IV - CONTINUATION As can be seen in the table, examples 3 to 10, which were prepared according to the present invention, and had gum-treated substrates, performed substantially better than the 3 to 10 control samples, when the substrate was mixed With sorbitol, the initial lumps formed in the mixture dissipated rapidly (which took no more than 10 minutes, by visual inspection). In contrast, for all control samples 1 to 3, the time to dissipation was much longer, at least sixty minutes or more. This indicates that the samples prepared according to the present invention all contributed to a significantly less viscous end product than the samples prepared according to the prior art. Similarly, after the sorbitoi / substrate mixtures of Examples 3 to 10 were formed and deposited on the grid screen 20, there was no lump residue remaining on the grid screen 20. In contrast, all the mixtures containing the control samples 1 to 3 left clumps of residue on the grid screen 20 after five minutes had elapsed. This again indicates that the samples prepared according to the present invention all contribute to a significantly less viscous end product, than the samples prepared according to the prior art. The experts of the subject will realize that changes can be made to the modalities described above, without departing from the broad inventive concept of them. It is understood, therefore, that this invention is not limited to the particular embodiments described, but is intended to cover the modifications within the spirit and scope of the present invention, as defined in the appended claims.

Claims (15)

1. A rubber-treated substrate containing gum and a substrate.

2. The rubber-treated substrate of claim 1, further containing from about 5 weight percent to about 30 weight percent rubber.

3. The gummed substrate of claim 1, further characterized in that the gum is selected from the group consisting of carrageenan-based products, carboxymethyl cellulose-based products, and xanthan-based products, and the substrate is selected from the group that it consists of dicalcium phosphate dihydrate, calcium carbonate abrasives, titanium dioxide, amorphous precipitated silica, silica gel, and sodium aluminosilicate.

4. The rubber-treated substrate of claim 1, further characterized in that the substrate is rubber coated.

5. The rubber-treated substrate of claim 1, further characterized in that the substrate is porous and the gum is impregnated in the substrate.

6. A method for forming a gummed substrate, comprising the steps of: a) liquefying a gum; and b) applying the gum to a substrate. The method of claim 6, further characterized in that in step a) the gum is liquefied by mixing the gum with water to form a first mixture. The method of claim 7, further characterized in that the first mixture has a gum concentration of from about 0.1 percent by weight to about 20 percent by weight. The method of claim 8, further characterized in that the water has a temperature from about 20 ° C to about 95 ° C. 10. A method for providing a dentifrice composition comprising the steps of: a) forming a rubber-treated substrate, according to the method of claim 6; b) mixing the rubber-treated substrate with one or more ingredients selected from the group consisting of abrasives, other thickeners, humectants, antibacterial agents, fluorides, flavors, sweeteners, and surfactants, to form a dentifrice, characterized in that a first measurement of The viscosity of the dentifrice is less than about 1.6 x 104 cps; and c) storing the dentifrice for a period of time, such that a second viscosity measurement of the dentifrice after the period of time is greater than about 10 x 104 cps. 11. A dentifrice containing a gum-treated substrate, which contains gum and a substrate. The dentifrice according to claim 11, further containing one or more ingredients selected from the group consisting of abrasives, other thickeners, humectants, antibacterial agents, fluorides, flavors, sweeteners, and surfactants. 13. The dentifrice according to claim 1, further characterized in that the gummed substrate contains from about 5 weight percent to about 30 weight percent gum. 14. The dentifrice of claim 13, further characterized in that the substrate is coated by the gum. 15. The dentifrice of claim 13, further characterized in that the substrate is porous and the gum is impregnated in the substrate.