CZ137999A3 - Mixture for bar casting process - Google Patents

Abstract

The rod or bar composition contains 10 to 40% by weight synthetic non-soap detergent, 10 to 50% by weight of the composition polyols formed by polyalkylene glycolems by molecular weight 2000 to 20000 and alkylene polyol 2 to 4 carbon atoms in % alkylene, 5 to 40 wt. water soluble of a structuring agent, more than 8 to 20% by weight of soap, 0 to 30 % by weight of the beneficial substance a2 to less than 10% by weight; water wherein the weight ratio of polyols to water is at least 3: 1.

Description

The present invention relates to compositions for cast bars or bars (hereinafter referred to as bars) which, because they are cast, can be processed and, at the same time, if desired, can deliver a larger amount of beneficial agent (e.g. a beneficial agent is often difficult to achieve when the agent is used in small amounts and when large amounts are used to increase the dosage, the bars are often soft and very difficult to process). Further, due to the small amounts of water contained and the low polyol to water ratios, the rods may be cast, and may supply water-soluble materials, the delivery of which is usually very difficult to achieve.

BACKGROUND OF THE INVENTION

Bars for personal washing are constantly moving towards finer recipes that provide increased skin care, often in the form of a settled emollient oil. With conventional rod extrusion technology (ie where the ingredients are combined and mixed at higher temperatures, then they are cooled to form pieces that are kneaded and extruded) it is often very difficult to provide larger amounts of low melting point emollients,

φ φ φ φ φφφφ and mild water-soluble surfactants (ie liquid components). Using the casting technique (i.e.

the liquid components are allowed to cool in the mold to form a final bar), however, bars can be prepared that more easily tolerate higher levels of such liquid components. More specifically, and without wishing to be limited by theory, it is believed that this is due to the mesh structure of the crystallized solid bar component (i.e., the fatty acid soap) that is capable of retaining large amounts of liquid. While the extrusion process destroys the mesh structure and irreversibly causes separation of the liquid phase, casting allows the undisturbed formation of the mesh structure, where it can then serve to trap the liquid component.

Previously, however, certain minimum amounts of water were required in cast compositions to dissolve the soap components needed to form a sieve crystalline structure while maintaining low melt viscosity and isotropicity. When not enough water was used (i.e. about 10% as required minimum), recipes of this kind could not be processed (i.e., the viscosity was too high to be noted to dissolve the structure).

spilling). Further, as required a minimum amount of soap water and to form a crystalline sieve

U.S. Pat. No. 5,227,086 issued to Kacher et al., And U.S. Pat. No. 5,262,079 to Kacher et al. Both provide framed (i.e., cast) skin cleansing bars 30 containing 5 to 50% fatty acid (from 20 to 65%).

No. 3 neutralized in U.S. Pat. No. 5,262,079, and substantially free fatty acids in U.S. Pat.

5,227,086), about 15 to 65% of the anionic or non-ionic stiffness support of the bar, and 15 to 55% of water.

9

9 · 9 9 9 9 9 9

9

9 9 9

WO 95/26710 (granted to Procter and Gamble) claims a foaming skin cleansing bar comprising a) 5 to 40 parts lipid skin moisturizer, b) 10 to 50 parts fatty acid soap, c) 1 to 50 parts foaming synthetic surfactant , and d) 10 to 50 parts of water.

As clearly indicated on page 20 of WO 95/26710, levels 15 contained in water below 10% would severely damage these bars, since the compositions would not be able to be processed (i.e. the viscosity would be too high for spillage). In contrast, the bars of the present invention form a pourable isotropic composition even at water levels below 10%.

U.S. Pat. No. 5,520,840 to Massar et al., Applicants claim bars (essentially intended for extrusion, not casting) with compositions in some respects similar to the compositions of the present invention.

The compositions of this reference comprise 10-60% of a synthetic surfactant, a water-soluble structuring agent (which is preferably a medium molecular weight polyalkylene oxide, or a mixture of polyalkylene oxides), a water-insoluble structuring agent (i.e., a fatty acid). , and · · · * · · a a a a a a a a a a a a a a a a a a · · · · · · · · · · ·

- 4 low water levels.

However, since these compositions are generally intended as extruded bar compositions, there are several large differences between them and between the bars of the present invention.

In particular, the polyol component (b) of the bars of the present invention must have far more liquid (i.e., lower molecular weight) components than bars of Massar et al., To ensure melt pourability when casting bars during their manufacture. Thus, rods of the invention require an alkylene polyol component (eg, a C ₂ to C ₄ alkylene glycol and / or glycerin), and further require that either the ratio of alkylene polyol or alkylene polyol with benefit agent to polyalkylene glycol be about 0.8: 1 and higher.

Second, the bars of Massar et al. Preferably contain no more than 10% soap, while the bars of the present invention have more than 10% soap, preferably 10.5 to 20% by weight of soap. Without wishing to be limited by theory, it is believed that a certain minimum soap content in casting technology is required to create a mesh structure capable of trapping a liquid component (i.e., water and a low molecular weight polyol). In contrast, the extruded bars do not necessarily require such minimum amounts of soap.

Third, the bars of Massar et al. (I.e., extrusion bars) contain little or no beneficial agent (i.e., e.g.

- 5 when using silicone, it is used only as a processing aid and even then in quantities below 0.5%). In contrast, the bars of the present invention contain 0 to 30% by weight, preferably 1 to 25%, most preferably 1.5 to 15% by weight of the beneficial agent.

Finally, with reference to Kacher et al., Not only do they indicate the need for criticality in the type of polyol, but also in the extreme (i.e. 10 to 50% water and 0.5 to 35% polyol according to WO 95/26710), the highest obtainable polyol ratio to water is 35% to 10%, or 3.5 to 1. However, it is clear that Kacher et al generally intended much higher levels of water (e.g., 15 to 40% according to US references), and lower levels of polyol content. Thus, Kacher et al do not propose levels of 3: 1, preferably 3.5: 1, and most preferably 4: 1 ratios of polyol to water, as in the present invention. Such ratios are required to achieve a pourable area where it can be cast successfully.

In other words, the intention of Kacher and others was clearly to provide high water to polyol ratios (see examples), since this was necessary for the processability of the bars. In contrast to this, according to the teachings of the present invention, they can be successfully processed even at high polyol to water ratios.

SUMMARY OF THE INVENTION

Applicants have unexpectedly found an area where, with extremely careful selection of variables, a rod can be poured, while maintaining a high temperature.

• 4 · 4

4 ·

- 6 mild surfactants, and delivering higher levels of beneficial agents than previously possible. The bars may be cast at lower levels of water contained than previously thought possible.

More specifically, the present invention relates to a composition of a casting composition comprising:

(a) 10 to 40% by weight of synthetic non-soap detergents or a mixture of synthetic non-soap detergents,

b) 10 to 50% by weight of a polyol, and the polyol comprises a mixture of (i) a polyalkylene glycol having a molecular weight of 15 about 2000 to about 20000, a melting point of about 55 to 65 ° C, and the following general structure;

R ₁ -O (CH ₂ -CHO) _n H

AND

R ₂ R ₄ - H, C ₄ to C ₄ alkyl,

R ₂ = hydrogen, CH ₃ , and n = about 40 to 200, preferably 40 to 100, and 25 (ii) a C ₂ to C ₄ alkylene polyol having a melting point such that it is liquid at room temperature (e.g. ethylene glycol, propylene glycol, or glycerin), wherein the ratio of the alkylene polyol to the polyalkylene glycol or the ratio of the alkylene glycol with the beneficial agent of the component, (e) to the polyalkylene glycol is about 0.8: and above; · ·· ··

-Ίο ') 5-40% of a water insoluble structurant selected from the group consisting of preferably saturated Cg to C ₂₄ free fatty acids with straight-chain and preferably from Cg to C ₂₀ saturated straight-chain alkanols,

d) more than 8%, preferably 10 to 30% soap,

e) 0 to 30%, preferably 1 to 25%, most preferably 1.5 to 15% of a beneficial agent (eg, silicone or other emollient oil), and

f) 2% to less than 10%, preferably 2 to 8% water, wherein the ratio of total polyol (b) to water is at least 3: 1, most preferably at least 4: 1.

In a preferred embodiment of the invention, the utility properties are further improved by adding 1 to 10%, preferably 2 to 5% wax as a fatty acid substitute.

DETAILED DESCRIPTION OF THE INVENTION

The present invention relates to rod casting compositions comprising a mild surfactant system (eg, synthetic, non-soap active). Since these are not soap-structured systems, the surfactants and solvents to dissolve these surfactants must be carefully selected to ensure that the surfactants readily dissolve or disperse to form a homogeneous predominantly isotropic melt. The melt must then have a low viscosity to pump, the cooled solid • 999

9 9 • 9 · fc

They must have the structural integrity expected for a bar (cube) for personal washing.

Cast bars (for example, the rods discussed above by Kacher et al.) Previously required relatively large amounts of water contained to provide a viscosity sufficient for pumping, and without wishing to be limited by theory, it is believed that the present invention avoids the use of such large amounts of water. using larger amounts of a lower molecular weight solvent.

Previous references to extruded rods (for example, the above-discussed invention of Massara et al.) Have not even recognized the critical role of the solvent system since the pumpable low viscosity composition is not of interest to the extruded rods.

Applicants have unexpectedly found an area of extremely low water content where by manipulating the solvent system (and the polyol to water ratio) it is possible to form a pumpable mixture of low viscosity synthetic non-soap surfactant (i.e. less than about 10,000 centipoise at 90 ° C). Because it is a cast bar, it is possible to use a greater amount of emollient / benefit agents than when using extrusion bars (in extrusion bars, this agent is lost during processing).

Applicants have therefore found a low water casting composition which allows the supply of larger amounts of emollients

reagents than previously possible.

The various components of the system are described in greater detail below.

a) Synthetic non-soap surfactant

The bars of the present invention contain 10 to 50%, preferably more than 20 to 50%, most preferably 25 to 50% by weight of the total synthetic non-soap surfactant mixture.

More specifically, the surfactant system will generally comprise at least one anionic surfactant, an amphoteric surfactant, or preferably a mixture of anionic, or anionic and zwitterionic surfactant.

An anionic surfactant may be an aliphatic sulfonate, such as a primary alkane (e.g. C _g C ₂₂₎ sulfonate, primary alkane (e.g. Cg - _C22) disulfonate, C _g - C ₂₂ alkene sulfonate, _Cg - _C22 hydroxyalkane sulfonate or alkyl glyceryl ether sulfonate (AGS), or aromatic sulfonates such as alkyl benzene sulfonate.

The anionic surfactant may also be an alkyl sulfate (e.g. C ₁₂ - C _g alkyl sulfate) or alkyl ether sulfate (including alkyl glyceryl ether sulfates). Among alkyl ether sulfates are sulfates with the following formula, • 9 9999 • 9 • 9 ··

9 9 9 • 9 9 99 99 90 90 99 99 99

RO (CH ₂ CH ₂ O) _n SO ₃ M, wherein R is alkyl or alkenyl of 8 to 18 carbon atoms, preferably 12 to 18 carbon atoms, n has an average value greater than 1.0, preferably greater than 3, and M is a dissolution causing a cation such as sodium, potassium, ammonium, or substituted ammonium. Ammonium and lauryl ether sulfates are preferred.

The anionic surfactant may also be sulfosuccinates (including mono and dialkyl, e.g., C ₁ -C ₂₂ sulfosuccinates), alkyl and acyl taurates, alkyl and acyl sarcosinates, sulfoacetates, C 8 -C ₂₂ alkyl phosphates and phosphates, alkyl phosphate esters, and alkoxy alkyl alkyls. phosphate esters, acylmléčnany, _Cg - _C22 monoalkyl succinates and maleates, acetates, sulfo, alkyl glucosides and acyl isethionates.

The sulfosuccinates can be monoalkyl sulfosuccinates according to the following formula, r ² o ₂ cch ₂ ch (so ₃ m) every ₂ m, and amide-MEA sulfosuccinates according to the formula

R ¹ CONHCH ₂ CH ₂ O ₂ CCH ₂ CH (SO ₃ M) CO ₂ M, wherein R ¹ is in the range of C 8 -C ₂₂ alkyls and M is a cation-causing solution.

- 11 Sarcosine generally refer to the formula RCON _{(CH3) 2} as ₂ m, wherein R is in the range of _Cg - C _2Q alkyl, and M is a cation dissolution.

Taurates are generally determined by the formula r ² conr ³ ch ₂ ch ₂ s ₃ m, where R ² is in the range of C 8 -C 20 alkyl, R ³ is in the range of -C 4 alkyl, and M is the cation-causing solution.

Particularly preferred are _Cg - C, _g acyl isethionates. These esters are prepared by reaction between an alkali metal isethionate with a mixture of aliphatic fatty acids having from 6 to 6

At least 75% by weight of the fatty acid mixture has 12 to 18 carbon atoms, and up to 25% by weight has 6 to 10 carbon atoms.

The optionally present acyl isethionates will generally range from about 10 to about 40% by weight of the total bar composition. Preferably, the component is present from about 15% to about 35% by weight.

The acyl isethionate may be an alkoxylated isethionate according to U.S. Pat. No. 5,393,466, issued to Ilardi et al., And this patent is incorporated herein by reference. This compound has

0 0 0 • 0 0 0

0 0 0

0 0 0 0

- 12 • 00 00 00 00

00 * 0 0 0 0 0 0 0

0 0 »· 0 general formula

O X Y

I I

RC-O- CH-CH ₂ - (OCH-CH ₂ ) _m -SO ₃ M ⁺ , where R is an alkyl group of 8 to 18 carbon atoms, m is 10 an integer from 1 to 4, X and Y is hydrogen or alkyl of up to 4 carbon atoms, and M ⁺ is a monovalent cation such as sodium, potassium, or ammonium.

In general, the anionic component is from about 10 to about 40% by weight of the bar composition, preferably 15 to 35%.

Amphoteric detergents that may be used in the present invention contain at least one acid group. It may be a carboxylic or sulfonic acid group. They contain quaternary nitrogen and are therefore quaternary amido acids. In general, they should contain an alkyl or alkenyl group of 7 to 18 carbon atoms. In general, they will follow the following overall structural formula,

OR ²

R ¹ - [- C -NH (CH ₂ ) _n -] _m -N ⁺ -xy,

- 13 «· k · · a a a a a a a a a a a a

* · · · 9 · · 9 9 9 9! ! ♦ 9 · · · · kde * kde kde kde kde 9 kde kde kde 9 9 9

R ¹ is alkyl or alkenyl of 7 to 18 carbon atoms,

R ² and R ³ are each independently alkyl, hydroxyalkyl, or carboxylalkyl of 1 to 3 carbon atoms, n is 2 to 4, m is 0 to 1, x is alkylene of 1 to 3 carbon atoms optionally replaced by 15 hydroxyl, and y is -CO ₂ - or -SO 3 -.

Suitable amphoteric detergents according to the above general formula include simple betaines of the formula

R ‘

R ¹ -N- CH ₂ CO ₂ ',

R 'and amidobetaines according to formula ♦

• · · · ··· ♦

·· · 11 · 1 · m · 1 · 1

11

R ^z

R ¹ - CONH (CH 2) m - N ⁺ ) - CH ₂ CO ₂ ,

R 'wherein m is 2 or 3.

In both formulas, R ^{1 is} alkyl or alkenyl of 7 to 18 carbon atoms, R ² and R ³ are independently alkyl, hydroxyalkyl, or carboxylalkyl of 1 to 3 carbon atoms. R ¹ can in particular be a mixture of C ₁₂ and C ₁₄ alkyl groups obtained from coconut, so that at least one half, preferably at least three quarters of the o 2 R R ¹ groups have 10 to 14 carbon atoms. R and R are preferably methyl.

Another possibility is that the amphoteric detergent is a sulfobetaine according to the formula r ¹ -n ⁺ - (ch ₂ ) ₃ so ₃ , or tt ttt ·· · φ · · · t · tt · 9 ··· · tttt · tt ttt ttt ttt ttt ttt

R ‘

R ¹ - CONH (CH 2) m -N ⁺ ) - (CH 2) ₃ SO ₃ ,

R 'wherein m is 2 or 3, or variants of this formula wherein - (CH ₂ ) ₃ SO ₃ ^{- is} replaced by a group

OH

-ch ₂ chch ₂ so ₃ ~.

In these formulas, R ¹ , R ² , and R ^{3 are} amidobetaines as discussed.

The amphoteric component is usually 1 to 10% by weight of the bar composition.

Optionally, other surfactants (i.e., non-ionic, cationic) may also be used, although they should generally not be more than 0.01 to 10% by weight of the bar composition.

In particular, nonionic surfactants include the reaction products of compounds with hydrophobic groups and a reactive hydrogen atom, for example, aliphatic alcohols, acids, amides, or alkyl phenols with alkylene oxides, especially ethylene oxide alone, or propylene oxide. Specific nonionic detergent compounds are condensates of alkyl _(Cg - _C22) phenol

ΦΦ ΦΦ ··

- 16 - ethylene oxide condensation products of aliphatic (Cg - C _g) primary or secondary linear or branched alcohols with ethylene oxide, and products prepared by condensation of ethylene oxide with the reaction products of propylene oxide and ethylenediamine. Other so-called nonionic detergent compounds include long chain tertiary amine oxides, and long chain tertiary phosphine oxides and dialkyl sulfoxides.

Nonionic detergents may also be sugar amides, such as polysaccharide amide. In particular, the surfactant may be one of the lactobionic amides described in U.S. Pat. No. 5,389,279, issued to Ao et al., Which is hereby incorporated by reference, and polyhydroxy amides, as described in U.S. Pat. No. 5,312,954, to Letton et al., Which is incorporated herein by reference.

Examples of cationic detergents are quaternary ammonium compounds, such as alkyldimethylammonium halides.

Other surfactants that may be used are described in U.S. Pat. No. 3,723,325 to Parran Jr., and in Surface Agents and Detergents by Schwartz, Perry, and Berch, both of which are also incorporated herein by reference.

A preferred mixture comprises 10 to 40% by weight of acyl isethionate, and 1 to 10% by weight of betaine. The surfactant will comprise more than 20% by weight, preferably 25 to 40% by weight of the bar composition. .

b) Polyol blend

The second desired component of the invention is a polyol blend comprising a polyalkylene glycol component and an alkylene polyol component wherein the weight ratio of either the alkylene polyol (AP) or the combination of alkylene polyol with the benefit agent to the polyalkylene glycol is about 0.8: 1 and greater, preferably greater than 1.5. Preferably, the upper limit should be less than about 20: 1.

The polyalkylene glycol should be a medium or low molecular weight material with a molecular weight in the range of about 2000 to about 20000, preferably 4000 to 10000, and a melting point between 55 to 65 ° C.

The alkylene polyol generally has the following general structure:

R ₁ -O (CH ₂ CHO) _n H wherein

R 6 is hydrogen (H), C 1 -C 6 alkyl, R ₂ is H or CH ₃ , and n = about 40 to 200.

Alkylene polyol is preferably a C ₂ - C ₄ alkylene polyol point ·· · _Λ ί · · · · · «• · ···» ··· ··· ··· ·· * · * ♦ • «* • Melting to be liquid at room temperature. Examples include ethylene glycol, propylene glycol and glycerin.

Given the small amount of water used in these cast bars (which helps ensure good pumpability), it is critical, as noted above, that the amount of alkylene glycol, or a combination of alkylene glycol with a beneficial agent, outweighs the amount of polyalkylene glycol.

c) Water insoluble structuring agent / fatty acid.

The third desired component of the invention is a water-insoluble structuring agent, such as a fatty acid, in an amount of about 5 to 40% by weight, preferably 10 to 25% by weight. Suitable particularly envisaged materials are fatty acids, especially having a C 12 to C 24 carbon chain. Examples are lauric, myristic, palmitic, stearic, peanutic, and behenic acid and mixtures thereof. The sources of these fatty acids are coconut, light coconut, palm kernel, or palm kernel, and tallow fatty acids, and partially or fully hardened fatty acids or distilled fatty acids. Other suitable water-insoluble structuring agents include C8-C20 alkanols, especially cetyl alcohol. These materials generally have a water solubility of less than 5 g / liter at 20 ° C.

Mutual ratios of water-soluble structurants ·· ···· · · 999 9 • 9 9 ·· ··

(b) and water-insoluble structuring agents (c) determine the rate at which the bar wears in use.

The presence of a water-insoluble structuring agent contributes to retarding the dissolution of the rod when exposed to water during use, thereby reducing wear rate.

The total amount of component (c) is from 5 to 40% by weight of the composition, preferably 10 to 25%.

(d) Soap

The fourth desired ingredient of the invention is soap, in an amount of greater than about 8% to about 30%, preferably greater than 10% to about 20%.

Soap is meant salts of monocarboxylic fatty acids having a chain length from 8 to 22 carbon atoms, preferably C _g to C ₂₂ therein for improved texture and softness.

Without wishing to be limited by theory, it is believed that certain minimum amounts of soap are a significant difference with respect to extruded bars which do not necessarily require such large amounts of soap.

e) Beneficial agent

The key element of the invention is the ability, due to casting,

9 9 9 • 999 999 9 999 994 • 4 499 «99 99 99 99

20 to include 0 to 30% by weight, preferably 1 to 25% by weight of the beneficial agent in the bar composition.

The benefit agent mixture of the present invention may be the only benefit agent, or it may be a compound added by means of a carrier. Further, the benefit agent mixture may be a mixture of two or more compounds, one or all of which may have a benefit aspect. In addition, the beneficial agent may itself act as a carrier for other compounds that may be desirable to add to the bar composition.

The beneficial agent may be an emollient oil, meaning a skin softening compound (stratum corneum) by increasing its water content and keeping the skin soft by preventing a decrease in the water content.

Preferred emollients include:

(a) silicone oils, gums and modifications thereof, such as linear and cyclic polydimethyl siloxanes, amino, alkyl, alkylaryl and aryl silicone oils;

(b) fats and oils containing natural fats and oils, from sources such as jojoba, soybean, rice bran, avocado, almonds, olives, sesam, persic, castor oil, coconut, mink, cocoa fat, beef tallow, lard, and hardened oils obtained by hydrogenating the above oils, and synthetic mono, di and triglycerides such as myristic acid glyceride and 2-ethylhexanoic acid glyceride.

(c) waxes such as carnauba palm, spermaceti, beeswax, lanolin and their derivatives;

d) hydrophobic plant extracts,

(e) hydrocarbons such as liquid paraffin, vaseline, microcrystalline wax, ceresin, squalene, landing, and mineral oil;

(f) higher fatty acids, such as lauric, myristic, palmitic, stearic, behenic, oleic, linoleic, linolenic, lanolic, isostearic, and polyunsaturated fatty acids (PUFA);

(g) higher alcohols such as lauric, cetyl, stearyl, oleyl, behenyl, cholesterol, and 2-hexadecanol alcohol;

h) esters such as cetyl octanoate, myristyl lactate, cetyl lactate, isopropyl myristate, myristyl myristate, isopropyl palmitate, isopropyl adipate, butyl stearate, decyl oleate, cholesterol isostearate, glycerol monostearate, glycerol distearate, glycerol tristearate, alkyl lactate, alkyl lactate, alkyl lactate, alkyl lactate, alkyl tartrate,

i) etheric oils such as peppermint, jasmine, camphor,

- 22 of white cedar, bitter orange peel, rye, turpentine, cinnamon, bergamot, unshiu citrus, sweet flag, pine, lavender, laurel, clove, hibiscus, eucalyptus, lemon, starfish, thyme, rose, thyme, essential oil , sage, menthol oil, cineol, eugenol, citral, citronella essential oil, borneol, linalool, geraniol, evening primrose, thymol, spirea, penen, limonene and terpenoid oils,

j) lipids such as cholesterol, ceramides, sucrose esters, and pseudo-ceramides, as described in European Patent No. 5,960,549; 556,957,

k) vitamins such as vitamin A and E, and alkyl esters of vitamins, including vitamin C alkyl ester,

(l) sunscreens such as 20 octyl methoxyl cinnamon (Parsol MCX) and butyl methoxy benzoyl methane (Parsol 1789);

(m) phospholipids; and

(n) mixtures of any of the foregoing.

A particularly preferred benefit agent is silicone, preferably silicones with a viscosity of greater than about 10,000 centipoise. The silicone may be a rubber and / or may be a mixture of silicones. One example is polydimethyl siloxane with a viscosity.

- 23 about 60000 centistokes.

f) Water

Finally, as indicated above, another critical area of the invention is the use of small amounts of water, ie 2 to less than 10%, preferably 2 to 8%, most preferably 3 to 7% by weight. The amounts of water are intentionally low to provide isotropic pumpable melt, which upon cooling forms a solid solid.

Since the amounts of water are so small, it is important that the ratio of polyol to water is at least 3: 1, preferably greater than 3.5:

The use of a polyol having a predominantly low molecular weight (recall that the ratio of the amount of alkylene polyol or polyalkylene glycol with benefit agent to the amount of polyalkylene glycol is at least 0.8: 1) ensures that the mixture is sufficiently pumpable.

The invention further encompasses the use of wax as a fatty acid substitute. The wax may preferably be 1 to 10%, preferably up to 5% by weight of the rod.

An example of a wax that can be used is paraffin wax (melting point 45-70 ° C).

All of the above percentages are by weight unless otherwise indicated.

• · · · · · · ·

The following examples are given by way of illustration only and are not intended to limit the claims in any way.

DETAILED DESCRIPTION OF THE INVENTION

Material

Sodium cocoyl isethionate was supplied by Lever Hammond. Polyethylene glycol was supplied by Union Carbide. Cocoamidopropyl betaine and Tego Care (glyceryl stearate) were supplied by Goldschmidt. Palmitic / stearic acid was supplied by Emery. Polydimethyl siloxane was supplied by General Electric.

Propylene glycol was supplied by Fisher. Paraffin was supplied by Moore & Munger Marketing Inc.

Processing of mixture according to recipe (casting)

The bars were made by casting. First, the ingredients were mixed together at 80-120 ° C in a 500 mL beaker, and the amount of water was adjusted to about 10-15% by weight. The batch was covered to prevent loss of moisture and was stirred for about 15 minutes. Then the cover was removed, and the mixture was allowed to dry. The moisture content of samples taken at various times during the drying stage was determined by Karl Fisher titration using a turbo-titration apparatus. At the final moisture value (approximately 5%), the beaker mixture was poured into bar forms and allowed to cool to room temperature for four hours. After solidification, the mold formed in the mold. ··.

! ! · ··············· · · · · · ·

·· · ·· ·· ·· ··

- 25 rod.

Protocol

Zei new test

In an 8-inch vial, 30 ml of a 2% aqueous dispersion of the bar mixture was prepared. The dispersions were placed in a 45 ° C bath until completely dissolved. After equilibration at room temperature, 1.50 grams of zein was added to each solution with rapid stirring for one hour. The solutions were then placed in centrifuge tubes and centrifuged for 30 minutes at approximately 3000 rpm. The undissolved zein was isolated, rinsed, and allowed to dry in an oven at 60 ° C until constant weight. The percentage of dissolved zein, which is proportional to the irritant potential, was determined gravimetrically.

Test for making porridge

The amount of slurry formed by the bar was determined by placing the bar in a plastic dish and adding 25 ml of water. The dish was covered and left to stand for 24 hours. The resulting slurry layer was gently scraped with a spatula, weighed, and the result was compared to a commercially available Dove ™ ¹ bar.

- 26 · · · · φ

ΒΒΒ · Β

Wear rate test

The half-gallon tank was placed under a running tap at a temperature of 105 ° F. Hands and test rod were immersed in water for 3 seconds. Then they were removed from the water, and the rod was turned ten times in his hand. This was repeated, the rod was last immersed, and placed in a flat soap dish containing 7.5 ml. The washing procedure was performed four times a day the next day. The bar was allowed to dry overnight, and the required weight in grams per wash (for 2 bars) was counted and recorded.

Detection of silicone by FTIR

Infrared spectra were collected with a Nicolet 5SXB FTIR spectrometer equipped with attenuated total reflection (ATR). The ATR element was a 60 ZnSe crystal with a collection surface of 1 cm x 7 cm. The spectra were then collected with a resolution of 8 cm, and an average of 32 records was generated. Relative differences in PDMS concentration were estimated by comparing maximum means

-l silicone amplitudes at 800 cm

Silicone deposition in-vitro

The pig skin was shaved, dermatomated and divided into 25 cm thin pieces prior to processing. The skin sample was then processed by rubbing the rod sample across the skin ten times, moving it back and forth. The resulting liquid was 30 seconds

The soap was then rinsed for 10 seconds with 90-95 ° F water (translator's note: approximately 35 ° C).

The processed skin sample was then placed in a borosilicate scintillation vial containing 10 ml of xylene. The samples were placed on a plate vibrator for 1 hour for silicone extraction. After the extraction time, the skin was removed from the vial and the extract was analyzed for silicone content by Graphite Furnace Atomic Absorption. Sample solutions were tested against a 10 ppm silicone standard.

Example 1

The bars with the composition according to the recipe in Table 1 were prepared.

Table 1: Composition of the cast mixture

Component 1 2 1 Sodium cocoyl isethionate 28.5 28.5 2 Cocamidopropyl betaine 5.0 5.0 3 Sodium stearate 20.0 15.0 4 polyethylene glycol 8000 5.0 10. 5 palmitic / stearic acid 13.1 13.1 6 paraffin wax 3.0 3.0 various (eg salts) 1.4 1.4 7 propylene glycol 18.3 18 ^ 3 8 water 5.7 5.7

• 9

9 ·

- 28 - ·· 9 9 9 9 · Φ · · ·

09 /

The bars were prepared as follows:

(1) Components 4 to 7 were mixed together and heated to 90 ° C with stirring. (2) Component 3 was added and dissolved, followed by the addition of components 2 and 8. (3) After the isotropic mixture was added, the component was added and dissolved. 1, (4) after the formation of the isotropic hot melt, the melt was poured into a mold.

It should be noted that the sequence has not been recorded and that many other options can be used.

Example 3: Atmospheric slurry formation and wear

Both bars 1 and 2 formed melt with relatively low viscosity at 90 ° C. These hot solutions had approximately a viscosity of 1000 centipoise at 20 s ^-1 . It has been found that after preparation in an associated stamper, they can be easily pumped into molds. The resulting bars were well-soaped, and had relatively low slurry values, about 6.6 grams of slurry after 24 hours in water and gentle scraping (rod 1), and 4.4 grams of slurry (rod 2), compared to a Dove ( ^R ) rod (about 12 grams). The bars further had relatively low wear rates, about 2.8 grams / wash (bar 1), and 2.4 grams / wash (bar 2) (the same as Dove ^ ^R b). These data were surprising considering the relatively large water fraction (i.e. water) and polyol) in these bars, it has been shown that when cast, bars of good quality, with a high liquid fraction content, can easily be produced.

·· ··· * • 0 00 • · * 0 • 0 · 0 0 0 0 0 0 • 0 ·· 00

Example 4: Low irritation

The irritant potentials of these mixtures were initially determined approximately by the zein test, and by recording the magnitude of about 20% of the dissolved zein. This is about 100% less zein dissolved than in commercial Dove ^ ^R ^ rod. This indicates reduced irritation.

Example 4: Including silicone in the masterbatch

Applicants have sought to ascertain to what extent skin-softening oils, in particular polydimethyl siloxane, having a viscosity of 60,000 centistokes can be deposited from the selected cast composition. The use of casting technology to supply these oils in the washing process is attractive for two reasons:

1. Softening oils are readily incorporated into the cast bar composition by partially exchanging its liquid fraction.

2. Large, separate drops of these oils are easier to hold in the matrix of the cast bar compared to the extrusion process.

Given the first point, conventional syndetics bars tend to soften rapidly when directly added emollient oils,

0%, such as silicone or mineral oil, in amounts above 1%, in particular above 3-4%, which makes the extrusion process difficult or impossible.

In mixture 2 of Table 1, propylene glycol 5%, 7.5%, and 10% polydimethyl siloxane (PDMS) was partially replaced (mixtures 3, 4 and 5, below in Table 2).

Table 2: Mixtures containing polydimethylsiloxane

3 4 5 sodium cocoyl isethionate 28.5 28.5 28.5 cocamidopropyl betaine 5.0 5.0 5.0 sodium stearate 10.0 10.0 10.0 polyethylene glycol 8000 10.0 10.0 10.0 palmitic / stearic acid 14.5 14.5 14.5 paraffin wax 3.0 3.0 3.0 glyceryl stearate (Tego Care) 5.0 5.0 5.0 propylene glycol 13.3 10.8 8.3 water 5.7 5.7 5.7 polydimethyl siloxane 5.0 7.5 10.0 After mixing the PDMS in the melt appeared as evenly dispersed. -

► 9 9 9

99,999 ·· ·

After pouring and cooling, it was necessary to determine the extent to which the PDMS migrated inside the matrix of the rod. It was possible that the cooling process time was long enough to agglomerate the silicone and float it to the rod surface. For the test, the rod containing 7.5% PDMS was cut with a scalpel. Samples were taken from the top, bottom, left side, right side, and center of the rod. Their layer was then deposited on a Zn-Se crystal of a Nicolet FTIR device. The absorption spectra of the Si-0 band (800 cm ^-1 ) were recorded, showing that the silicone was evenly distributed in the rod. More specifically, the uniformity of peak heights indicates that the silicone did not migrate appreciably during the cooling process and remained evenly distributed throughout the rod.

Example 5: Saving

Compared to conventional conditions (5% PDMS used in conventional processing), the extent to which PDMS can be deposited on the skin from a mixture of rods, 3 (5% PDMS), 4 (7.5% PDMS), and 5 (10% PDMS) was monitored. ), using in vitro deposition on pig skin, and the results are shown in the table below.

·· 99 • 4 9 9

49 • 9 9 9 • 4 4 • 49 494

According to 5 (10% PDMS) ^x

8.5 • 9 9

- 3 2 ^: Deposition of polydimethyl siloxane on pig skin

Dove ( ^R > * Lux ^ * By 3 (5% By 4 (7.5%)

PDMS) PDMS ^{x) x}

0.25 0.25 1.6 2.1

Data are in micrograms per square centimeter.

* 5% PDMS dispersed in a conventional bar using conventional processing (not casting);

^x PDMS applied in casting processing.

The casting composition of the present invention was

Z π \ significantly higher than using conventional bars (Dove ^K 'and Lux ( ^R )) in which 5% PDMS was simply dispersed.

· · «« · · ·

Claims (11)

Patent claims A bar casting composition comprising (a) 10-40% by weight of a synthetic non-soap detergent or a synthetic non-soap detergent composition, (b) 10 to 50% by weight of a polyol composition, and the composition comprises admixture (i) polyalkylene glycol with a molecular weight between 2000 and 20,000, and a melting point of about 55-65 ° C, and (ii) C ₂ ^'C 4 alkylene polyol which is liquid at room temperature, and wherein the weight ratio of alkylene polyol or alkylene polyol with a beneficial agent according to (e) below, the polyalkylene glycol is about 0.8: 1 and greater; (c) 5 to 40% by weight of a water-soluble structuring agent selected from the group consisting of C 8 to C ₂₄ fatty acids and C 8 to C ₂₀ alkanols; d) more than about 8 to 20% by weight of soap, (e) 0 to 30% by weight of the benefit agent, and (f) 2 to less than 10% by weight of water, and wherein the ratio of polyol (b) to water is at least 3: 1. 2. The composition of claim 1, wherein the polyalkylene glycol has a molecular weight of about 4000 to 10,000. 3. The composition of claim 1, wherein the polyalkylene glycol has the following structure: - 34 ft ft ft ft ft ft ft ft ft * ftft 4 ft · ft ft 4 ft · ft · S R ₁ -O (CH ₂ CHO) _n H R, wherein R 1 = H, F to C ₄ alkyl, R ₂ = Η, CH 8, and _n = about 40 to 200. alkyl polyol is selected from the group consisting of C ₂ ^ ₄ 4. The composition of claim 1 wherein up to C is alkylene glycols and glycerin. 5. The composition of claim 1, wherein the fatty acid is 10-25% by weight of the composition. 6. The composition of claim 1 wherein the fatty acid is a straight chain saturated _C12 to _C14 fatty acid. 7. The composition of claim 1 wherein the alkanol is cetyl alcohol. 8. A composition according to claim 1 comprising at least 10 to 20% by weight of soap. A composition according to claim 1, wherein the ratio of the weight of polyol (b) to water (f) is at least about 3.5: 1. ·· ·· - 35 ·· 9999 «9 • 9 • 9 9 «99 ♦♦ ··> 99 · • 9 · 9 9 9 9 • * 9 · 99 999 The composition of claim 9, wherein the ratio of the weight of polyol (b) to water (f) is at least 4: 1. 11. The composition of claim 1 further comprising from about 1% to about 10% by weight of wax.