EP0447434A1

EP0447434A1 - Toothpaste

Info

Publication number: EP0447434A1
Application number: EP90900130A
Authority: EP
Inventors: Norbert Kornettka; Franz Förg; Albert Stöffler; Jürgen Fiedler
Original assignee: Henkel AG and Co KGaA
Current assignee: Henkel AG and Co KGaA
Priority date: 1988-12-12
Filing date: 1989-12-04
Publication date: 1991-09-25
Also published as: NO911790D0; DK94291D0; DE58905540D1; NO178816B; EP0373469A3; EP0373469B1; CA2005239A1; ES2042946T3; FI912643A0; ATE94053T1; DK94291A; DE3841775A1; NO911790L; NO178816C; EP0373469A2; JPH04502310A; WO1990006744A3; WO1990006744A2; US5324505A

Abstract

Multicolour-striped strips of toothpaste, in particular with a cross-section in the form of an n-sided polygon, where n is a whole number between 3 and 7, can be extruded from a reservoir, without diffuse transition regions, if the ratio of the liquid limits of the carrier material and of the stripe material is approximately 1.10 : 1 to 1.20 : 1. A suitable extruder is shown in Figure 1.

Description

"Toothpaste"

The invention relates to toothpastes in the form of a multi-colored, striped strand and a device for dispensing the strand from a container.

For products in the field of personal care and cosmetics, in addition to the corresponding ingredients, an appealing dosage form is becoming increasingly important. In addition to the pure aesthetics, which play a major role in the choice of color, packaging and often also the consistency of the product, practical aspects can also arise. Thus, for example, the joy of children in colors and shapes can be geared towards making the children playfully familiar with the necessary processes for cleaning and caring for the body. One way of educating children to provide regular, intensive care for the dentition is to provide toothpaste that is colored, if possible multicolored, which is distinguished by an appealing shape of the strand and, if appropriate, provided with a pleasant aroma.

Toothpastes with embedded cores or strips are known. For example, German Offenlegungsschrift 19 37 001 describes toothpastes in which strips or cores of a further paste-like mass with a high cleaning effect are embedded in a gel-like carrier strand. The reverse case, in which one opaque toothpaste carrier strand with a high cleaning effect, see-through strips are stored, can be found in European patent application 76 563. In both documents it is pointed out that the carrier strand mass and the strip mass should have the same rheological properties as possible. Further examples of striped toothpastes can be found in German Offenlegungsschriften 16 17907 and 2454 136.

Striped toothpaste strands are usually produced by simultaneously releasing carrier strand mass and strip mass when pressure is exerted on the storage container. The desired appearance of the toothpaste strand is determined by a corresponding construction of the outlet opening of the storage container. Information for filling corresponding toothpaste tubes and for designing the outlet opening of these tubes can be found, for example, in German patent specification 1185981 and British patent specification 813514.-

The known strip tooth pastes have an approximately circular, usually not very stable strand cross section. A diffuse transition region is also often formed between the carrier strand and the strips.

This transition area should be eliminated to increase the aesthetic appearance of the strand. There is also a need for toothpaste strands with a polygonal cross section which have an improved hold on toothbrushes. This is of particular interest if the toothbrushes are operated by children. The differently colored strips can now be located in the edges of such a toothpaste strand. For this purpose, the carrier strand mass and the strip mass should be coordinated with one another in such a way that they are to be brought out of a container synchronously and uniformly, the strip mass in particular forming the corner edges of a polygonal toothpaste strand.

Furthermore, a device is to be created which enables the synchronized and uniform application of the two coordinated toothpaste phases.

It has now surprisingly been found that the object can be achieved by formulating carrier strand masses and strip masses such that they differ from one another in a defined manner in certain theological parameters.

The invention thus relates to a toothpaste for dispensing from a container in the form of a multi-colored, striped strand, consisting of a carrier strand mass and at least one strip mass different in color from the carrier strand mass, characterized in that the ratio of the flow limits of Carrier strand mass and strip mass is about 1.10: 1 to 1.20: 1.

Toothpastes usually show the rheological behavior of non-Newtonian liquids. When a shear stress is applied that is below a value known as the yield point, the substance behaves like a solid. A flow of the substance is only observed when shear stresses are applied that are greater than this limit. The functional relationship between applied shear stress and observed shear rate above the yield point can be determined with the help of semi-empirical State equations such as the Bingham equation or the Casson equation are described. In most cases, the rheological behavior of toothpastes is pretty good through the Casson equation

D = r - V? _c ) ² l η

described, whereby the individual sizes have the following meaning:

D shear rate t shear stress f _c yield point (according to Casson) η dynamic viscosity.

Further details on these rheological relationships can be found in the relevant specialist literature, e.g. the publications by R.R. Zangger in CZ-Chε ie-Technik, 3rd year, pp. 283-286 (1974), G. Simon in Chemiker-Zeitung, 100th year, pp. 25-34 (1976) and B. Idsoπ in Cosmetics and Toiletries , Vol 93, pp. 23-30 (1978).

The rheological properties of the toothpastes can be determined with the commercially available viscometers, for example the rotary viscosifiers from Haake. The yield point can be read off in a graphic in which the respective shear rate is plotted as a function of the shear stress, if necessary by extrapolating the measurement curve to D = 0, in a manner known to the person skilled in the art. If the toothpaste shows a relationship in the form of a hysteresis curve, if the shear rate is changed cyclically between 0 and a certain value, then the numerical values for Yield point and viscosity in all cases on the so-called upward shear rate. This is the measuring section in which the shear rate is increased from 0 to the final value. The measuring and evaluation method used is shown in detail in the example part.

Toothpastes in which the ratio of the flow limits of carrier strand mass and strip mass is 1.12: 1 to 1.18: 1, in particular approximately 1.15: 1, have proven particularly suitable for the use according to the invention. At room temperature, the absolute values of the flow limits for the toothpastes according to the invention are in the range of approximately 65-280 Pa.

It is also advantageous if the other rheological properties of the carrier strand mass and the strip mass differ only slightly. It is particularly advantageous if the dynamic viscosities, which are measured at shear stresses above the yield point, show as little difference as possible. These dynamic viscosities for the tooth pastes according to the invention are in a range from about 0.01 to 0.05 Pas at room temperature.

This can be achieved, for example, in that the carrier strand mass and the strip mass differ only in the content of water and / or other additives used to adjust the flow limits, as well as dyes and / or pigments. Carrier strand mass and strip mass can be formulated on the basis of a basic mixture. The above-mentioned components are then mixed into this basic mixture.

The toothpastes according to the invention can be produced in the form of gel-like or pasty preparations from the known components. Common components are abrasives and cleaning agents, Water, humectants, thickeners, surfactants, aroma substances, sweeteners, antiseptics and undos etisch acting substances and dyes.

Suitable abrasives and cleaning agents are, for example, special silicas such as precipitated silicas and gel silicas, aluminum oxide trihydrate, finely divided o-aluminum oxide, calcium carbonate, calcium phosphate, magnesium phosphate, water-insoluble sodium metaphosphate, magnesium carbonate and magnesium hydroxide as well as mixtures of these compounds. The abrasives and cleaning agents are usually used in amounts of approximately 15-45% by weight, based on the total mass of the toothpaste.

Substances serving as humectants are, for example, polyalcohols, such as Glycerin, sorbitol and xylitol.

For thickening the preparations, for example, aerosilicic acids, beπtonite and hydrocolloids such as carboxymethylcellulose, hydroxyethylcellulose, hydroxypropylguar, hydroxyethylstarch, polyvinylpyrrolidone, polyethylene glycols, vegetable gums such as tragacanth, agar-agar, Carragheeπane, gum arabic as well as carboxypropylene and carbohydrates Types are used.

Furthermore, surface-active substances, preferably anionic high-foaming surfactants, such as, for example, linear sodium alkyl sulfates with 12-18 C atoms in the alkyl group, sodium salts of alkyl polyglycol ether sulfates with 12-16 C atoms in the linear alkyl group and 2-6 glycol ether groups in the molecule, of linear alkane (^ 12-18) sulfonates, sulfosuccinic acid monoalkyl (C ^ 2_ιs) esters, sulfated fatty acid onoglycerides, sulfated Fatty acid alkanolamides, sulfoacetic acid ^* alkyl (C ^* 2-i8) esters, acyl sarcosides, acyl taurides and acyl isethionates each containing 8-18 C atoms in the acyl group. Nonionic surfactants are also suitable, for example oxyethylates of fatty acid mono- and diglycerides, fatty acid sorbitan esters and ethylene oxide-propylene oxide block polymers.

Examples of suitable aroma substances are pepper oil, spearmint oil, eucalyptus oil, anise oil, fennel oil, caraway oil, menthyl acetate, cinnamaldehyde, anethole, vanillin and thymol, and mixtures of these and other natural and synthetic flavors. It may be preferred to use flavorings which give the toothpaste a taste which corresponds to that of fruits such as strawberry, raspberry, pineapple, apple or orange.

As a sweetener, the toothpastes can contain substances such as saccharin, sodium cyclamate, aspartyl-phenylalanine methyl ester and asulfur ( ^R ) κ and sucrose, lactose, maltose and fructose.

Antiseptics and oral cosmetic substances are to be understood as preservatives and antimicrobial substances, anti-tartar substances, caries-inhibiting, plaque-inhibiting substances and anti-inflammatory substances.

Suitable preservatives and antimicrobial substances include p-Hydroxybenzoic acid methyl, ethyl and propyl ester, sodium sorbate, sodium benzoate, bromochlorophene, phenylsalicylic acid ester and thymol.

Azacycloheptane-2,2-diphosphonic acid, 1-hydroxyethane-1,1-diphosphonic acid, 1-phosphonopropane can be used as anti-tartar active ingredients. 1,2,3-tricarboxylic acid and its sodium salts and the compounds known from US Pat. No. 3,488,419, DE-OS 22 24 430 and DE-OS 23 43 196 are used.

Caries-inhibiting substances are, for example, sodium fluoride, sodium monofluorophosphate and tin fluoride.

Suitable keratogenic or anti-inflammatory substances are e.g. Allantoin, urea, azulene, chamomile active ingredients and acetylsalicylic acid derivatives.

Finally, the toothpastes according to the invention can also contain dyes and / or pigments such as e.g. Contain titanium dioxide and buffer substances such as primary, secondary or tertiary alkali phosphates or citric acid / sodium citrate.

The additives which are preferably used to set the flow limits are polyalcohols, in particular sorbitol and / or glycerol, and / or silica.

Toothpastes according to the invention show a particularly advantageous aesthetic appearance if they contain carrier strand mass and strip mass in a volume ratio of approximately 92: 8 to approximately 97: 3, in particular approximately 95: 5.

Within the framework of the teaching according to the invention, both carrier strand mass and strip mass can be formulated independently of one another in such a way that they appear transparent or non-transparent. The corresponding measures, for example the addition of pigments for non-transparent formulations, are known to the person skilled in the art. It is furthermore particularly preferred that the toothpaste is dispensed from the storage container as a strand with a cross section in the form of an n-corner, where n is an integer from 3 to 7, and the strip mass is deposited in the ken of the n-corner. Delivery in the form of a strand with a cross section in the form of a rectangle, in particular in the form of a square, is very particularly preferred.

The partial task with regard to the device is achieved in a device of the generic type in that the outlet opening in the area of the neck has a polygonal, in particular square, cross-sectional area and that the openings are arranged in the corners of the cross-sectional area.

This creates a discharge nipple for toothpaste containers with which a polygonal toothpaste strand can be conveyed out of the container, in which the strips form the edges.

A device for use in dispensing the toothpaste according to the invention is explained in more detail below, for example. This shows in

1 shows a longitudinal section through the device and in

Figure 2 is a supervision.

The device consists of a discharge nipple, generally designated (1), which has a riser pipe (2) which merges into a neck (4) which surrounds the discharge opening (3). A shoulder (5) is integrally formed on the neck (4), which then merges into a container wall (6). For example, that is - 10th

Container wall (6) the wall of a laminate tube. In this respect, the upper region of a tube is shown in FIG. 1, as is known from conventional toothpaste tubes for dispensing strip toothpaste. In contrast to these usual tubes, the nipple now points

(1) in the area of the transition from the riser pipe (2) to the neck (4), which takes place in the area in which the shoulder (5) is also formed on the neck (4), a cross-sectional widening and change. While the riser pipe (2) has a round cylindrical cross section and thus a round strand of a product B is to be conveyed through the riser pipe (2), the cross section of the outlet opening (3) widens in the region of the neck (4) to one square cross section. In the transition area from the riser pipe (2) arranged concentrically to the outlet opening (3) to the neck (4), four openings (7) are formed on the inner circumference. These openings (7) lie exactly in the four corners of the square outlet opening (3), which is enclosed by the neck (4). Passing along the longitudinal edges of the perforations (7), narrow webs (8) are formed above the length of the riser pipe (2), reaching just below the upper edge of the neck (4), which are slightly out of the inner surface of the riser pipe

(2) and neck (4) protrude and form narrow channels (9). A strip mass A is guided in these channels (9) above the openings (7).

In the container enclosed by the holding wall (6), there is usually a support strand A to the bottom edge of the riser pipe (2) and in the remaining annular space between the outer surface of the riser pipe (2) and the container wall (6 ) and below the shoulder (5) is usually the strip mass A. Overall, such a container is customary 95% filled with the carrier strand mass B and 5% with the strip mass A.

If pressure is now exerted on the carrier strand mass B, in the case of a flexible container wall (6) usually by finger pressure from the outside, the carrier mass B transmits this pressure to the strip mass A and the carrier strand mass B passes through the riser pipe (2) and through the openings (7) the strip mass A into the container opening (3). Due to the design of the neck (4), a square toothpaste strand is formed in the area thereof, the corner edges of which are formed by the strip mass A. With different color designs of carrier strand mass B and stripe mass A, a toothpaste strand is then obtained with stripes of contrasting color on the corner edges.

A thread (10) is formed on the outer surface of the neck (4), onto which a customary closure for closing the outlet opening (3) can be screwed.

B e s p i e l e:

The following recipe examples serve to explain the invention further, without restricting it thereto.

1. Toothpaste base

To formulate a toothpaste according to the invention, the transparent basic mixture specified below is first prepared:

¹ (DEGUSSA) (DEGUSSA)

3 (SLEEVES)

⁴ carboxymethyl cellulose sodium salt (AQUAL0N) The following toothpastes were formulated on the basis of this basic mixture (the quantities given are parts by weight):

1. Toothpaste with opaque carrier strand mass and non-transparent stripe mass

Carrier strand mass strip mass

Basic mix 97.2 97.2

Sorbitol (70% in water) or glycerin (86% in water) - 2.0

Water (fully salted) 2.1

Titanium dioxide - 0.8

Airgel silicic acid FK 300 DS 0.7

Dyes <0.05 <0.05

Yield point (Pa) at 20 ° C 257 222

Viscosity (Pas) at 20 ° C 0.02 0.02

2. Toothpaste with transparent carrier strand and strip mass

Carrier strand mass, strip mass, basic mix 98.0 98.0

Sorbitol (70% in water) or glycerin (86% in water) - 2.0

Water (fully desalinated) 1.3

Airgel silica FK 300 DS 0.7

Dyes <0.05 <0.05

Flow limit (Pa) at 20 ° C 227 200

Viscosity (Pas) at 20 ° C 0.02 0.03

The viscosity measurements were carried out with the Rotovisco RV 12 measuring system from Haake using the SV II St measuring device and the measuring head 150. The Haak Rhεocontrollεr serves to control the drive of the measuring head.

The measuring process was carried out at a temperature of 20 ° C. For this purpose, the shear rate was first increased continuously in the course of 180 seconds from D = 0 to 128 min "l (upward shear rate). After a holding time of 6 seconds at D = 128 the speed of rotation was continuously reduced from 128 to 0 min in the course of 180 seconds. If the determined relationship between gravity and shear stress is plotted graphically, a hysteresis curve was generally obtained.

The output signal ^'e of Rotovisco RV 12 have been transferred via an interface to a computer, the evaluation was carried out with the aid of. For this purpose, the flow limit at D = was determined from the measured values for the shear stress at D = 32 min -1 and D = 128 min -1 by means of a regression calculation based on the Casson equation

0 calculated.

The numerical values for the flow limits and the viscosities in the above tables each relate to the upward shear rate. The numerical values given are values which the toothpaste masses reach after storage of approximately one week and which do not change much further within the scope of the measurement accuracy when stored further. Usually, directly after preparation of the toothpaste mass, significantly lower values for the flow limits and significantly higher values for the viscosity are measured. .These values initially change strongly in the first hours and days and reach the specified end values asymptotically after about a week.

Claims

1. Toothpaste for dispensing from a container in the form of a multi-colored, striped strand, consisting of a carrier strand mass and at least one, in the same color, different from the carrier strand mass, thereby knowing the width and width ratio of the carrier ratio is about 1.10: 1 to 1.20: 1.

2. Toothpaste according to claim 1, characterized gekennzeichnεt that the ratio of the flow limits 1.12: 1 to 1.18: 1, in particular approximately 1.15: 1, carries.

3. Toothpaste according to one of claims 1 or 2, characterized in that carrier strand mass and strip mass are determined only by the content of water, other additives used to adjust the flow limits as well as dyes and / or pig εntεπ undtεrschε dεn.

4. Toothpaste according to claim 3, characterized in that the additives used to adjust the flow limits are polyalcohols, in particular sorbitol and / or glycerol, and / or kisses acid.

5. toothpaste according to einεm dεr claims 1 to 4, characterized gekenn¬ characterized in that it contains carrier strand mass and strip mass in a volume ratio of 92: 8 to 97: 3, in particular of about 95: 5.

6. Toothpaste according to one of claims 1 to 5, characterized εnn- zεichnεt that siε as a strand with a cross section in shape an n-corner, where n is an integer from 3 to 7, is released from the storage container and the strip mass is in the corners of the n-corner.

7. toothpaste according to claim 5, characterized gekεnnzεichnεt that it as a strand with a cross section in the form of a Rεchtεckεs, in particular in the form of a square, is given off from the reservoir.

8. Device for use for dispensing strip-shaped toothpaste, in particular toothpaste according to one of claims 6 or 7, from a container, such as a tube or a dispenser, consisting of a nipple (1) with a neck ( 4) shoulder with the outlet opening (3) and angefor ^'mter Ring¬ (5), wherein inside the nipple (1) below the neck Ringschultεr (5) to the neck (4) an approximately cylindrical riser concentrically to the outlet opening (3) (2 is formed), which has in its transition area to the neck (4) ^{"perforations} (7), characterized in that the outlet opening (3) in the region of the neck (4) has, auf¬ a polygonal insbesonderε square cross-sectional area, and that the Openings (7) are arranged in the corners of the cross-sectional area.