MXPA00001872A - Soap bars - Google Patents

Abstract

A soap bar comprises 40-85%soap, 1-40%water immiscible benefit agent, 1-40%solid water soluble carrier and 5-25%water. The carrier is initially mixed with the benefit agent to form a premix which is subsequently dispersed into the soap. Suitable benefit agents are oils and humectants whereas suitable carriers are starches, modified starches and water soluble solid polymers.

Description

SOAP BARS DESCRIPTION OF THE INVENTION The invention relates generally to bars of soap, and in particular to a process for producing bars of soap comprising a beneficial agent. ~~ Toilet soap is the main product used for personal washing around the world. Although the fat load used to make such products varies greatly, the properties in UJO vary little, apart from the amount of fertilizer. The sensory properties of the bar, that is to say the quality of sudsing and after the sensation of wet skin after washing, are totally unaffected by the fat loading. One of the main objectives in recent years has been to find routes to modify sensory properties of the bar, especially the interaction of the product with the skin. This objective is directly linked to the consumer requirements for new experiences of a bar product. Early attempts in this direction entrusted to the addition of fatty acids to soaps leads to a modified suds creaminess, but provides without affecting the sensation of wet skin after washing. More recently some results have been made by the addition of synthetic actives which due to the dispersing action of lime-soap tends to modify the interaction of precipitated calcium and magnesium soaps with skin, and therefore modifies the sensation of wet skin of the product. . This approach, although successful, imposes significant changes in the load of grease to maintain acceptable bar processing and properties in the presence of synthetic assets of high solubility.A resistance to breakage in sensor supply of toilet soaps could be one or more additives that could be incorporated into the existing toilet soap formulations using existing equipment, without the need for any modification in fat loading.This could allow such products to be processed at similar total yields, for conventional toilet soaps and , due to the use of identical fat loading, without alteration in the manufacture of wet soap in factories, changing the grease load is a major issue in the manufacture of continuous soap, due to the fact that the control process is extremely sensitive to Fat loading.- An approach that has been intensively studied by a number of workers is to incorporate an oil, into the base of the soap. This leads to claims of a minimum of success, but do not have several setbacks, ie, i. Soap mass becomes - sticky and difficult to process due to oil-coating soap and equipment; tipie problems include poor feed in the mills, low extrusion ratios and blockage of the final product has a sticky feel and requires additional packing to avoid oil contamination / oil leakage. The size of the oil drops in the product is extremely sensitive to the process, hence the manufacturing can be carefully controlled, that is, reduced total yield is often necessary. ~ In general, this type of product can provide sensory benefits, but due to the problems mentioned above, it has not been commercially viable.It is an object of the invention to provide an improved process for making soap bars that overcomes at least some of the Previous problems It has been discovered that the incorporation of specific beneficial agents in water soluble carriers can substantially correct or improve in all s process problems mentioned above, and can lead to the production of total bars in performances similar to conventional toilet soaps that have comparable purposes for toilet soaps with encionales. In addition these products provide modified sudsing and sensory properties of moist skin feeling without any detrimental effects on properties in use of general bars, such as the amount of sudsing, wear ratio and clutter. The basis of this invention is that the beneficial agent is first pre-mixed - in a solid carrier matrix so that its domain size is fixed, and constant throughout the process regime. This ensures that the effects of the process in oil droplet size are minimized, and therefore ensures consistent supply of independent properties independent of the variation of the process. Additionally, for beneficial agents that can be soothed by soap, (eg, vegetable oils), the carrier-effectively removes the migration of oil through the product, and therefore removes the oil. risk of oil solubilization, since the oil is avoided by mixing with liquid material in the bar. The carrier is selected from materials that are soluble in water, and thus dissolved to release the beneficial agent during the washing process. It has also been found that the supply of sensory effects in wet-skin sensation are significantly increased if the carrier dissolves via a viscous solution state, i.e., the carrier dissolves producing an initial substantial increase in viscosity (e.g., initial stages). of hydration of the po 1 ime ~ ro). This viscous state during which the beneficial agent is released is the key to the first step of a sensory effect to modify the wet-skin sensation after washing.

Typical carriers that meet this criterion have visco-ss of a carrier / water solution at 60% ex-c of 1000 millipascal seconds (mPas) measured in a cutting ratio of 1 to 20 degrees Celsius. Current invention is typically comprised of non-lauric oils and lauric oils, ideally in a metric ratio of 95/5 to 10/90. Typical non-lauric oils, include bait, palm, bait stearins, palm stearins, oils Partially hardened vegetables and mixtures thereof with partially or fully hardened oils Typical oils include coconut oils, almond palm, and babassu oil.The soap base is generally produced by saponification of the oil mixture using an appropriate alkali such as sodium, potassium, calcium and magnesium alkalis or combinations thereof The soap base made is ideally dried at a moisture content in the range of 5-25% s of the addition of the agent premix p o r t a r-b e n e f i c co, or alternatively the p r eme z of the carrier-beneficial agent can be added to the pure soap before drying.

The carrier ideally exists as a solid at ambient and process conditions, "therefore its melting point preferably exceeds 80 ° C. The carrier is ideally soluble in water completely, and will ideally be dissolved in water via a viscous liquid, where the viscosity of a 60% aqueous / carrier solution is in excess of 1000 mPa.s at a shear rate of 10 s-1 at 20 ° C. The viscous liquid state can be achieved for example by the formation of liquid crystals or by molecular complications of large molecules (eg polymers) Examples of carriers that meet these requirements are ma 11 odex trines, starches, modified starches, PVP, PVA, and cellulosic polymers, however other carriers that meet the physical requirements mentioned above they are conceived The preferred properties of the beneficial agents are as follows: First, they would preferably be liquid at a temperature typical environment wash ratios and process temperatures, that is, they could have a freezing point less than 30 ° C. Second, they could be essentially free of water to prevent dissolution of the carrier in the stick product, before or washing with the product. Third, they could have a lower viscosity, that is, less than 60,000 mPas, more preferably less than 30,000 mPas. Fourth, they would ideally be immiscible in water. Examples of beneficial agents that meet these requirements are less viscous silicone oils, vegetable oils, mineral oils, synthetic oils (e.g., IPM, IPP), and mixtures thereof. The beneficial agent may be an "emollient oil" by which a substance that softens the skin (stratum corneum) is associated with its water content, and maintaining its softness by retarding the decrease in water content. Preferred emollients include: (a) silicone oils, gums and modifications thereof, such as linear and cyclic polydimethylsiloxanes; amino, alkyl, alkylaryl and arylsilicone oils; (b) fats and oils that include natural fats and oils such as jojoba oil, soybean, rice bran, avocado, almond, olive, sesame / persic, castor, coconut, cacao; butter, partially hardened oils obtained by hydrogenation of the oils mentioned above, and synthetic mono, di and triglycerides such as myristic acid glyceride and 2-ethylhexanoic acid glyceride, (c) waxes such as carnauba, whale sperm, lanolin and derivatives thereof (d) hydrophobic plant extracts; (e) hydrocarbons such as liquid paraffins, Vaseline "(trademark, microcrystalline wax, ceresin, squalene, pristane and mineral oil) (f) higher fatty acids such as oleic, linoleic, linolenic, lanolic, isostearic and poly unsaturated fatty acids (PUFA); (g) higher alcohols such as 1-hydroxy alcohol, oleyl, cholesterol, and 2-hexydercanol; (h) esters such as "cetyl octanoate, myristyl lactate, cetyl lactate, isopropyl myristate, myristyl myristate, i s or p r o palmitate? ilo, isopropium adipate, butyl stearate, decyl oleate, cholesterol isostearate, glycerol monostearate, glycerol distearate, glycerol tristearate, alkyl lactate, alkyl citrate and alkyl tartrate; (i) essential oils such as peppermint oil, jasmine, camphor, white cedar, castrara of bitter orange, riu, turpentine, cinnamon, bergamot, citrus unshiu, calamus, pine, lavender, bayo, clove, hiba, eucalyptus, lemon, flowers estre 11 a, thymus, pepper, rose, wise, menthol, cineol, eugenol, citral, citronella, borneol, linalool, geraniol, primorosa at night, camphor, thymol, espirantol, penene, limonene and terpenoid; (j) lipids such as ceramides, sucrose esters and branched pulses as described in European Patent Specification No. 556, 957; (k) sunscreen creams such as octyl methoxy cinnamate (Parsol MCX) and butyl methoxy benzoylmethane (Parsol 1789); (1) phospholipids; and (m) mixtures of any of the above components. A beneficial agent -particularly preferred is silicone, preferably silicones having a viscosity of less than 60,000 seconds per 1 s to 1 s. The silicone can be a rubber and / or it can be a mixture of silicones. An example is p or 1 i dime t i 1 s i 1 oxa not having an approximate viscosity of 0.06 square meters per second (m2s_1) (60,000 centistokes). The carrier ratio for beneficial agent is widely between 1: 4 and 4: 1, preferably greater than, or equal to 0.3: 1, and more preferably greater than, or equal to 0.75: 1. The invention will be more clearly understood from the following description of some examples thereof, given by way of example only. The following Examples 1-5 illustrate the invention wherein the carrier e ~ s a po 1 i vi ni lp irro 1 i dona, with a molecular weight of 8.0 x 103, and the beneficial agent is selected from low viscosity silicone oils and sunflower oil. The benefit ratio varies between 0.5: 1 to 2: 1. The manufacturing process is comprised of a pre-metered stage, wherein the carrier and benefit agent are mixed together in a suitable soft-solid mixer, (e.g., ribbon mixer or Z-blade mixer) followed by mixing this mixture in the dry soap, again using either a ribbon or z-knife mixer, followed by conventional toilet soap finishing processes, (i.e., grinding, extruding and stamping).

EXAMPLES 1 2 3 COMPONENT Bait / CON = 80/20 77/0 74.5 74.5 7 .5"" 74.5 Sodium soap ratio polyvinylpyrrolidone 2.5 5 Silicone oil 5 5 (5000 cps) Silicone oil - 5 2.5 (12500 - cps) Sunflower oil - 5 Per fume 1.5 1.5 1.5 1.5 1.5 Water and less than 100% All foundations of examples 1-5 have acceptable use properties comparable to conventional toilet soap. In addition, specific studies of formulations in Examples 1 and 4 showed both of these to have modified sudsing and skin feel properties compared to conventional toilet soap.

The formulations of the following examples 6-10 are included to further illustrate the loss of process effects of the carrier / char agent operations. In these examples, the total additive level v_aría of 10-20% by weight in the product, and covers three types of carriers, that is, Maltodextrin and two tapioca starch derivatives. The bars were in all cases processed according to the method described by Examples 1-6, and the hardened lamination was found to be virtually independent of the carrying level of the beneficial gene, and very similar to the hardness of the soap of conventional toilet EXAMPLES 7 10 COMPONENT Bait / jón CON 74.5 69.5 64.5 69.5 69.5 Maltodextrin 5 10 15 (Grade) Natroscrb- B * Natrosorb- W * 5 A ceit e_ of 10 10 yes 1 ico ~ na (500 cps) Per fume 1.5 1.5 1.5 1.5 1.5 Water and less than 100 * These materials are tapioca starch derivatives, available from National Starch. The following Examples 11 to 14 further illustrate the soap bar formulations according to the invention. EXAMPLES 11 12 13- 14 COMPONENT 80/20 bait soap 74.5 74.5 74.5 74.5 WITH Maltodextrin - PVP 5 Isopropyl Palmitate 5 5 Mineral oil - 5 Per fume 1.5 1.5 1 .5 1.5 Water and less than 100% In Examples 15-19 the formulations were given of beneficial systems that fall outside the scope of this invention. In all cases, the manufacturing method is identical to that used in the previous formulations of Examples 1-10. In Examples 15, a water-soluble beneficial agent, glycerol, is incorporated at a ratio of 1/1 of the vitamin into the beneficent. The bars were produced of acceptable quality and hardness. The properties in use were found to be lower for conventional toilet soap, with the formulation of the example having a reduced amount of sudsing. The sensory studies found no significant difference in the quality of sudsing or wet skin sensation of conventional toilet soaps. In Example 16, a carrier that dissolves directly in an aqueous solution of low viscosity was used along with a modified soybean meal. Bar production was found to be extremely difficult, due to billet cracking and poor rod cohesion. The bars produced were harder than conventional toilet soap and have a poor final surface. In the properties in use of these products were found to be inferior to the toilet soap with encional, which has low wear rates and low soapyness.Sensory studies do not find any significant difference in the quality of sudsing or moist skin sensation. of conventional toilet soap.

In Examples 17 and 18 a beneficial agent that is comprised of a substantial amount of water, (about 50%) was incorporated into a maltodextrin carrier. The fabrication was found to be extremely difficult, with the pre-blended beneficial ingredient forming a viscous liquid that might not be easily mixed with the soap. The fissures formed were; soft and sticky like conventional toilet soap, and could not be stamped without the use of a matrix lubricant. In general, the formulation was clearly not suitable for processing on a continuous basis.

EXAMPLES 15 16 17 18 COMPONENT 80/20 bait opener 74. 5 54.5 74. 5 ~ 64.5 WITH Maltodextrin 5 - 5 10 PEG8000 - 20 - - Glycerol 5 - - - Soybean oil - 10 - -ma lea do S o 1 lactate uci ón - - 5 10 sodium Per fume 1. 5 1.5 1.5 1.5 Water and less than 100 The invention is not imitated by the examples and modalities described above, which may vary in both stages of process and details without deviating from the spirit of the invention, insofar as it remains within the scope of the r and i vi rdications.

Claims (13)

RE VINDICATIONS

1. A process for producing a soap bar of the type comprising soap and a beneficial agent of the process, comprises the steps of: premixing a beneficial agent with a solid organic water-soluble carrier a first stage of mixing; - adding the premix to a soap mixture to form a final soap mixture in a second mixing step; and - finalizing the final soap mixture to form a bar of soap.

2. Process as claimed in claim 1, in which during a washing step the carrier dissolves to release the beneficial agent from the skin.

3. Process as claimed in claims 1 or 2, in which the carrier is selected from soluble organic materials in water, having a melting point greater than or equal to 30 ° C.

4. Process as claimed in any of claims 1 to 3, in which a 60% solution of the carrier in water has a viscosity in excess of 1000 mPas when a cutting ratio of lOs-1 at 20 ° C is measured.

5. Process as claimed in any preceding claim, wherein the carrier is selected from the group comprising starches, modified starches and soluble polymers soluble in water.

6. Process as claimed in any of the preceding claims, wherein the beneficial agent is selected from oils and humectants.

7. Process as claimed "in claim 6, the beneficial oil agent is selected from silicone oils, natural oils, natural oils, mineral oils, synthetic oils, either in modified or unmodified form.

8. Process as claimed in any preceding claim, in which the ratio of the carrier to the beneficial agent is between 1: 4 to 4: 1.

9. Process as claimed in any preceding claim, during the second stage of mixing, the premix is added to the pure soap before drying.

10. Process as claimed in any of claims 1 to 8, in which during the second mixing step, the premix is added to the dry soap shavings.

11. Process according to any of the preceding claims, comprising 40-85% of soap, 1-40% of carrier, 1-40% of beneficial agent, and 5-25% of water.

12. Process as claimed in any of the preceding claims, wherein the soap is partially or completely replaced by one or more of the synthetic anionic surfactants, amphoteric surfactants or nonionic surfactants or mixtures thereof.

13. Process as claimed in any of the patent claims, which also includes perfume and dyes.