CZ196493A3 - Fine personal cleaning sticks with improved production capacity - Google Patents

Abstract

This invention is an improved mild personal cleansing syndet bar comprising: long chain alkyl sulfate having essentially saturated C15-C22, preferably C16-C18, alkyl chains, more preferably cetearyl sulfate, a high lathering, mild synthetic surfactants comprising C12-C14 alkyl isethionate, soap, fatty acids, and paraffin wax, preferably a high melting point paraffin wax. The bar has good processability, improved smears, and good in-use properties without meaningful lather negatives.

Description

The present invention relates to personal cleansing bars for synthetic surfactants and to a process for their preparation.

BACKGROUND OF THE INVENTION

Since its inception in history, soap has helped secure two of our greatest treasures, namely the health of us and our children. Health is directly related to purity. The data show that the higher the soap consumption in the country, the lower the infant mortality rate.

In industrialized countries, soap is the most commonly used and readily available personal hygiene product for daily body wash. Soap is also the cheapest product we use in proportion to its utility value. In many less fortunate countries, both laundry and toilet soaps are still rare and expensive.

Soap is most likely the oldest toilet product and, despite being easy to obtain in much of the world, is still rare in many countries. The earliest literature on soap relates to wool washing and was found on the Sumerian clay tables dating back to about 2500 BC. Sumerian was the language spoken in the Tigris and Euphrates rivers, now southern Iraq. Patriarch Abraham and his family came from Sumeria. Another Sumerian chart from 2200 BC shows a system composed of water, alkali and cassia oil.

Purity is essential to our well-being. Clean body, cleansing bath, clean home and clean environment are the norm today. The reference refers to syndicated and combined rods, especially pages 209-229.

Personal cleaning sticks based on synthetic surfactants are now of great interest as they can be selected to be milder in their skin effect than soap-based products. This subtlety however

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is related to negative phenomena for both manufacturers and »» p <Xřebář * el-e. Bar soap manufacturers have experience of their difficult processability due to the sticky nature of such products and expensive raw materials. Consumers feel deficiencies in foaming, spreadability, stick softness and consequently high wear.

The use of paraffin wax in bars based on synthetic surfactant is known per se. However, do known sticks suffer from deficiency? they are not gentle and / or low in foaming. The percentages of the components given below are in percent by weight.

E.g. I (U.S. Pat. No. 2,653,913, van Dijck et al., Issued September 29)

1953, discloses bars containing 80% synthetic anionic surfactant (selected from secondary or primary sodium alkyl sulfates or sodium dodecylbenzenesulfonate), 18% paraffin with a melting point (mp) of 60-65.5 ° C and 2% sodium alginate. The surfactants used are not fine.

U.S. Pat. U.S. Pat. No. 2,734,870, Lewis, issued Feb. 14, 1956, discloses bars containing 40 to 60% paraffin (m.p. > 51.7 ° C), 2 to 5% fatty acid and 60 to 40% sodium alkylarylsulfonate. The high paraffin levels in these bars result in poor foaming.

U.S. Pat. U.S. Pat. No. 3,129,187, Meehan, issued April 14, 1964, discloses bars containing 50-75% sodium alkylbenzene sulfonate, 5-35% stearyl alcohol, 1-25% paraffin (m.p.

51, 7 to 176.7 ° c) and 2 to 25% stearyl MEA. The abrasive surfactants used result in abrasive products.

U.S. Pat. U.S. Pat. No. 4,151,105, Roark, issued April 24, 1979, discloses bars containing 20 to 40% synthetic anionic surfactant (composed of sodium cocoyl isethionate and / or sodium lauryl sulfoacetate), 10 to 30% paraffin (tt54 <, 60%, 5-15% powdered starch, 10-30% dextrin and 5% fatty acid. The low melting point of the wax used causes a significant dirt load on the foam and results in a low foam volume.

U.S. Pat. U.S. Pat. No. 4,335,025, Barker et al., issued June 15, 1982, discloses a process for producing syndetical sticks containing a wax extender.

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Summary of the Invention

One object of the present invention is to provide a composition for a personal cleansing syndet stick that exhibits improved foaming and less wear without compromising the processability of the stick.

The invention relates to an improved processable, mild personal cleansing syndet bar comprising: at least about 10% by weight of ^C 15 ~ 22 ^{and wound} ^^^ ^s ^ ^m ^ 3i ^C ° to ^{substantially} saturated, preferably Cig-igalkylové chains, soap, free fatty acids , a lathering mild surfactant comprising C ^ ^ ₂ _ ₄ alkyl _{isethionates;} and a selected paraffin wax. The bar has improved wear without compromising foaming.

The percentages of the contents of the ingredients given below are in percent by weight.

A fine bar based on a synthetic surfactant (syndet bar) with improved workability, good foaming and / or reduced wear (lubricity) represents progress in this field. Syndet bar comprising (1) about 10 to 40 s, preferably about 15-35%, ^c j_5_22 ^'5 characterized ^{in HODO C} 16-18 ^alJcyl "sulfonate with essentially saturated chain (2) about 15 to 40%, preferably about 18-35%, mild, high lathering, synthetic surfactants with at least 10% by weight, based on the weight of the bar, _two C ^ _ ^ ₄ isethionates, (3) about 8.až%, preferably about 10 to 20 % <0-22 ^ 'ý ^{St. HODO} substantially ^C 12-18 saturated fatty acids, (4) about 2-15%, preferably about 3-12%, <\ Q 22' ^s / 12 ^{C HODO al talickokovov -18}} Ý ^{c! l} soaps, preferably sodium or potassium, (5) about 10 to 40%, preferably about 13 to 35%, paraffin wax with an average melting point of about; 55.4 to 82.2 ^ 0 /, preferably about 60 to 73 ', 9 ° Cr preferably about 61.1 to 71.1 ° C _from (6, about 0 to about 10% auxiliary plastic binders such as polyethylene glycols and and / or monoglyceride and (7) about 1.5 to 10%, preferably about 2 to 8%, more preferably about 2 to 5%, water.

While not wishing to be bound by any theory, it is preferable to consider that the synthetic rod comprises two separate components: the matrix and the active ingredients. The matrix determines the physical characteristics (workability and wear), while the active ingredients determine the foaming and fineness. Failure to select the correct matrix may interfere with foaming, causing poor touch,.

reduce or increase the wear rate below acceptable

limit and / or reduce the fineness of the product. Also, the active ingredients must be selected so as to achieve an acceptable level of foaming without adversely affecting the fineness and exchangeability of the formulations. _Λ

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The bars with improved processability include long chain alkyl sulphate and selected binders are disclosed in U.S. Pat. No. 07 / 605,614, J.R. Schwartz, W.E. Eccard, T.A.

Bakken and L.A. Gilbert, filed October 30, 1990, and No. 07/647 030,

J.R. Schwartz, W.E. Eccard, T.A. Bakken and L.A, Gilbert, filed

On Jan. 28, 1991, incorporated herein by reference. The present compositions provide rods with a better utility in terms of foaming and / or wear than the rods disclosed individually in the examples of said patent applications.

It is generally known that the development of a suitable rod matrix is a delicate act of balancing plasticity and brittleness without taking into account foaming. Typical rod softener materials for rods, such as triglycerides, fatty alcohols, etc., produce a sufficiently plastic matrix, but also reduce foaming. Other commonly used additive matrix materials, such as salts, polysaccharides, etc., result in the formation of a too brittle and water-soluble matrix that causes poor spreadability of the bar.

As used herein, the terms synthetic bar and also syndetical bar mean that the bar has more synthetic surfactants than soap, unless otherwise indicated. As used herein, the term "AS syndrome bar" refers to a bar containing an alkyl sulphate surfactant or equivalent, unless otherwise indicated. The term long chain refers to C ₁₅ and C ₂₂ , preferably ^C 16-2G ' ^and mixtures. The terms C _12-14 alkyl and cocoyl as used herein are synonymous.

The percentages, ratios and parts quoted are for the total weight of the mixture, unless otherwise indicated. All amounts and ranges are approximate unless otherwise indicated.

An essential element of the present invention is the surfactant f

system. Long chain alkyl sulphate (including the date reported for its long chain equivalent of synthetic surfactants) is a key element. It contains ^C 16-13 ^alkoxy chains in an amount of at least 90%, preferably about 93%, and more preferably about 97%. The long chain alkyl sulphate (and its equivalents) β is derived from the corresponding straight chain saturated alcohols. A preferred alkyl sulfate has a C 1-6 alkyl chain ratio in the range. about 100% Cg to about 100% Cg by weight. The commercially available Cig ^ igalkylsíranem is SIPON ® EC-111 (formerly ^R SIPEX EC-111), sodium cetearyl sulfate, which is approximately 60% C _1T. a 36%

C ^ g. SIPON® EC-111 is sold by Alcolac Company, Baltimore, MD 21226. Another source is Henkel Corp., Arnbler, PA 19002. Henkel sodium cetyl sulphate, LANETTE E, is estimated to be 50-50% of C 18 -igalkyl sulphate sold as an emulsifier.

Other long chain surfactants, which are equivalents of the long chain alkyl sulphate (mostly insoluble), can be used as either total or partial substitutes for the long chain alkyl sulphate. Examples are long-chain isethiolates, sarcosinates, glycaryl ether sulfonates, etc. Also suitable are acyl esters of isethionic acid salts, with esters of C 6-6 gacyl isethionates and with no more than 25% or less C 6 acyl groups. Preferred is stearoyl isethionate with 3% C, 50% C, and% C.

The fineness of the surfactant can be measured by the skin barrier destructive test used to assess the deleterious effects of the surfactants. In this test, the surfactant is the finer the less it damages the skin layer.

Damage to the skin layer (barrier) is measured by the relative amount of radio- labeled water 3 _(about HH 0) which passes from the test solution through the skin epidermis into the physiological buffer contained in the diffusate chamber. This test is described by TJ Eranz in J. Ivest. Dermatol., 1975, 64, pp. 190-195 and U.S. Patent No. 4,673,525 to Smáli et al., Issued June 16, 1937, which discloses a fine synthetic bar based on alkyl glyceryl ether sulfonate (AGS) as a surfactant. This synthetic bar comprises a normal alkyl glyceryl ether sulfonate mixture. Surprisingly, skin damage tests prove that long chain alkyl sulfates are finer than standard AGS. The long chain alkyl sulphate preferably comprises 15 to 40% by weight of the bars of the invention.

The bars of the invention contain a mild (fine) foaming surfactant in amounts of about 15 to 40%, preferably about 13 to 35%. Examples of high-foaming or sudsing-promoting surfactants, in particular with a finer effect, are:

Ci2_i lkylisethi ° ₄ ^{and n} sulfate, sodium lauroyl sarcosinate and g_ ^ C ^ ₄ alkyl glyceryl ether sulfonate. As defined herein, high lathering surfactant means one which lathers better than the long C ₁₅ _ ₁₈ ^and lkylsíran. By fine surfactant as defined herein is meant a substance which is finer than sodium dodecyl sulfate.

Numerous examples of surfactants generally are disclosed in the patents incorporated herein by reference. They contain limited amounts of anionic acyl sarcosinates, methylacyl taurates, N-acylglutamates, acyl isethionates, alkylsulfosuccinates. alkyl phosphate esters, ethoxylated alkyl phosphate esters, tridecetsulfates, protein condensates, mixtures of ethoxylated alkyl sulfates and alkylamine oxides, betaines, sultains, and mixtures thereof. Included in the surfactants are alkyl ethersulfates having 1 to 12 ethoxy groups, in particular ammonium and sodium lauryl ethers. The alkyl chains of these other surfactants contain ^C 8-18, preferably ^C 10-18. Preferred fine nonionic materials are alkyl glycosides and methyl glucose esters which can be mixed with other anionic or amphoteric surfactants in the compositions of the invention.

The bars according to the invention may have up to about 10% of highly foaming, finely divided or shorter chain or traditional (coconut) alkyl sulfates while still maintaining the rod fineness requirement.

A preferred syndet bar contains a mixture of C ^ ₄ ^ g_ isethionates (SCI) and sodium lauroyl sarcosinate in a ratio of about 1: 1 to 3: 1, preferably 1.5: 1 to about 2.5: 1.

The basic plastic binders of the invention are free fatty acid and paraffin wax.

The fatty acid material desired in the present invention is a material with a hydrocarbon chain length range of about 10 to 22 that is substantially saturated. These fatty acids can be highly pure mixtures with individual chain lengths and / or crude mixtures derived from fats and oils. A preferred mixture is lauric and stearic acid in a ratio of about 1: 3 to 3: 1, more preferably about 1: 2 to 2.5: 1.

The composition may comprise soaps derived from hydrocarbon chains having a length of about 10 to 22, substantially saturated. It is preferred that the soap is a sodium salt, but other soluble soaps may also be used. Potassium, ammonium, triethanol7 ammonium soaps and mixtures thereof are acceptable. The soaps are preferably prepared by saponifying in situ the corresponding fatty acids, but may also be added as ready-made soaps.

Insoluble soaps, such as magnesium and zinc soaps, are not included in the amount of 2 to 15 soaps in the defined composition. However, insoluble soaps may be used as non-foaming, non-precipitating diluents.

An important component of the present invention is a wax with a melting point of about 130-180 ° F (54-82 ° C), preferably about 60-74 ° C, and most preferably about 61-71 ° C. A preferred paraffin wax is a completely refined, paraffin wax that is odorless and tasteless and meets the requirements for use in coatings for food and food packaging. Such paraffins can be obtained commercially. A very suitable paraffin can be obtained, for example, from The National Wax Co. under the trademark 6975.

The paraffin is preferably present in the bar in an amount ranging from about 10 to 40% by weight. The paraffin component is added to the product to achieve skin softness, ductility, stability and processability. This also achieves a glossy appearance and a smooth hand feel.

Optionally, the paraffin component is supplemented with microcrystalline wax. A suitable microcrystalline wax has a melting point in the range, for example, 60-85 ° C, preferably about 62-79 ° C. The preferred wax should meet the requirements for the food grade microcrystalline waxes. A very suitable microcrystalline wax is available from Witco Chemical Company under the trade name Multiwax X-145A. The microcrystalline wax is present in the bar preferably in an amount of about 0.5 to 5% by weight. The microcrystalline wax component imparts flexibility to the bar at room temperature.

Auxiliary plastic binders may be added to the bar in an amount of 0 to about 10%. These binders may be selected from monoglycerides, polyethylene glycols, fatty alcohols, sugars, tallow alcohol ethoxylates and mixtures thereof. Other plastic binders are identified in published literature, such as J. Amer. Oil Chem.

5oc. 1932, 59, 442. The binder system may contain several plasticizers.

The synthetic rod of the present invention may contain 0 to about 5% of a suitable rapidly hydrating cationic polymer. The polymers have molecular weights of about iOCTO to 3,000,000.

The cationic polymer (skin conditioning agent) is selected from the group consisting of:

(I) cationic polysaccharides, (II) cationic copolymers of carbohydrates and synthetic cationic monomers, and (III) synthetic polymers selected from the group consisting of (A) cationic polyalkylenimines, (B) cationic ethoxy polyalkylenimines, and (C) cationic poly-Q 1 - [-3- (dimethylammonio) propyl-N '- [3- (ethylenoxyethylenedimethylammonio) propyl urea dichloride].

Particular examples of members of the cationic polysaccharide class are cationic hydroxyethylcaluloza JR manufactured by Union Carbide Corporation; cationic starches Stalok ** 100,

200, 300 and 400 manufactured by Staley, Inc .; guar resin cationic galactomannans of the Galactasol 800 series from Henkal, Inc., and the Jaguar series from Celanese Corporation.

Examples of members of the class of copolymers of saccharides and cationic synthetic monomers are substances; composed of cellulose derivatives (e.g. hydroxyethylcellulose) and N, N-diallyl-N, N-dialkylammonium chloride, obtainable from National Starch Corporation under the trademark Celquat.

Cationic synthetic polymers suitable for use in the present invention include cationic polyalkylenimines, athoxypolyalkylanimines, and [N- [3- (dimethylammonio) propyl] -1 '- [3- (ethylenoxyethylenedimethylammonio) propyl] urea dichloride] poles. The latter compound is obtainable from Miranol Chemical Company, Inc, under the trade name Miranol A-15, CAS Reg. No. 68555-36-2.

Preferred cationic polymeric skin conditioning agents of the invention are cationic polysaccharides of the cationic guar resin class having molecular weights of 1,000 to 3,000,000. More preferred are molecular weights of 2,500 to 350,000. These polymers have a polysaccharide backbone composed of galactomannan units and a degree of cationic substitution in the range about 0.04 to 0.30 per anhydroglucose unit with a sesubstituted cationic group which is an adduct of 2,3-epoxypropyltrimethylammonium chloride to the natural polysaccharide backbone (backbone). Examples are Jaguar C-14-3, C-15 and C-17 products by Celanese Corporation. In order to achieve the advantages described in the present invention, the polymer must have characteristics, either structural or physical, which make it suitable and completely hydrated and then readily fed into the soap matrix.

Other components according to the invention are chosen for a variety of applications. E.g. perfume may be used in the composition of skin cleansing products, usually in an amount of about 0.1 to 1.5% of the composition.

Alcohols, hydrotropes, dyes and fillers such as talc, clay, calcium carbonate and dextrin can also be used. Cetarylalcohol is a mixture of cetyl and stearyl alcohol. Protective products, such as sodium ethylenediaminetetraacetate (EDTA), usually in an amount of less than 1% of the composition, may be added to the cleaning products to prevent dye or fragrance degradation. Antibacterial agents may also be added, generally at dosages of up to 1.5%.

The following patents disclose or relate to such additives and formulations that can be used in the soap / synthetic bars of the present invention.

Pat.č. Expiry date Inventor (s) 4,234,464 11/1980 Morshauser 4,061,602 12/1977 Oberstar et al 4,472,297 9/1984 Bolich et al. 4,491,539 1/1985 Hoskins et al. 4,540,507 9/1935 Grollier 4,673,525 6/1987 Smali et al. 4,704,224 11/1987 Saud 4,812,253 3/1989 Smali et al. 4,820,447 4/1989 Medcalf et al. 4,954,282 9/1990 Rys et al. Synthetic sticks according to the invention have a pH of 4 up to 9% in 1% water

solution. Preferably the pH is 5 to 3, more preferably about 6.5 to 7.5. The basic ratios and key ingredients of the present invention are summarized in the following table. It results in broad, advantageous and advantageous amounts and ratios of some key ingredients. E.g. the bars of the invention may comprise a long chain alkyl sulphate in an amount of 10 to 40% by weight of the bar and a foaming fine synthetic surfactant in an amount of 15 to 40% by weight of the bar. Their wide and preferred ratio ranges are individually 2.5: 1 to 0.3 ': 1 and 2: 1 to 0.4: 1.

Their more preferred and exemplified ratios are in Examples 6 and 7 and are individually 0/6: 1 / 0.5: 1. Another example in the following table is a foaming fine synthetic surfactant and paraffin in which ratios of 4: 1 to 0.4: 1 and 2.5: 1 to 0.5: 1 can be individually wide and preferred. In Examples 6 and 7, their ratios are respectively 1.7: 1 and 0.9: 1.

The percentages, ratios and parts herein are by weight on the total base of the composition, unless otherwise indicated. All ranges and amounts herein are approximate unless otherwise indicated.

Basic table of ratios

Foaming fine synthetic surfactant Fatty Acids Soaps Paraffin Long chain alkyl sulfate cem (c _16-la ) broad: 10-40% 2.5: 1-0.3: 1 5: 1-0.4: 1 20: 1-0.7: 1 4: 1-0.3: 1 Advantageous: 15-35% 2: 1-0.4: 1 3.5: 1-0.8: 1 12: 1-1: 1 2.5: 1-0.4: 1 Form. 6 / Form. 7 0.6: 1 / 0.5: 1 1.5: 1 / 1.5: 1 4: 1 / 3.8: 1 1: 1 / 0.9: 1 Foaming fine synthetic surfactant Wide: 15-40% N / A 5: 1-0.6: 1 20: 1-1: 1 4: 1-0.4: 1 Preferred: 18-35% N / A 3.5: 1-0.9: 1 12: 1-1.5: 1 2.5: 1-0.5: 1 Form. 6 / Form. 7 N / A 2.3: 1 / 2.8: 1 7.2: 1 / 7.4: 1 1.7: 1 / 1.3: 1 Free fatty acids wide: 8-25% x ON 12.5: 1-0.5: 1 2.5: 1-0.2: 1 Preferred: 10-20% x ON 7.1-0.8: 1 1.5: 1-0.3: 1 Form. 6 / Form. 7 x ON 2.6: 1 / 2.6: 1 0.6: 1 / 0.6: 1 Soaps wide: 2-15% x X ON 1.5: 1-0.05: 1 Preferred: 3-12% x X * ON 1: 1-0,08: 1 Form. 6 / Form. 7 x X ON 0.2: 1 / 0.2: 1 Paraffin wax Wide: 10-40% x X X ON Preferred: 13-35% x X X ON

Form 6 7 x x χn / A

X

Listed elsewhere in the table.

Laboratory evaluation of bar

The following test procedures are used to evaluate critical performance features in rod fineness and processability.

Lubricity test

Equipment:

1. 02-2O2C Fisher Brand hexagonal polystyrene weighing pans (4 x 3).

# 14-366A Fisher Brand Spatula.

3. Balance capable of weighing to two decimal places.

4. Room temperature 49 ° C.

5. Timekeeping.

Testing method

1. Number the weighing pans necessary and numbered and weighed (two weighing pans per sample, one marked M as a slurry and one marked S as a soaking pan).

2. Weigh the original bar and record its weight.

Place the bar in a weighed dish labeled S.

3. Add 30 ml of room temperature tap water (along the wall of the weighing dish) to the dish containing the prototype rod. Pour 30 ml of room temperature tap water into a dish containing the control rod. When placing the bars in the trays, make sure that the bars do not touch the sides of the trays,

4. Allow the bars to soak in weighing dishes at room temperature for 2 hours at rest.

5. After 2 hours soak, carefully remove the rod and let it drip into the same bowl for 15 seconds.

6. After 15 seconds, the bar is inverted and placed in a weighed dish labeled M.

7. Weigh the soaked bar and record its weight.

3. Weigh and record the damp surface or slurry from the stick with a scraping spatula into the same weighed dish marked M.

This is a wet degree of craziness. The best scraping results are obtained when the spatula is held loosely in the hand, taking care not to scrape or scrape the stick too deep. Once the surface of the stick does not appear to be more damp or shiny, the scraping is complete. In order to eliminate the differences in scratching by the individual, the results of each test are reported relative to the control sample in that test.

9. The scraped bar is weighed and recorded.

10. Place the soaking dish, porridge dish and scraped stick in a room temperature of 49 ° C for 48 hours to evaporate the water.

11. After 48 hours, the soaking dish, the porridge dish and the scraped bar shall be weighed and their dry weights recorded.

12. The surface area of the scraped rod portion is calculated by measuring the length and width (in inches) and multiplying them.

13. The number of dry grams of mash is added to the number of dry grams of the brood. This is the dry degree of grease in grams.

All test series should include a control and all samples should be tested in duplicate. At the same time, a maximum of 7 products (6 plus control) can be tested and a 10 minute water interval should be maintained between 4 samples and no products should be soaked for more than 2 hours.

Foam volume test for hand washing with soap bar

This test is used to measure the volume of foam in use to determine the foaming efficiency of cleansing bars on the skin.

The test measures both the final volume of the foam produced and the volume # produced after a very short foaming period (in order to determine foaming rest). Foam volumes are formed under dirt loading conditions.

The foam volume test here under dirt loading is performed with synthetic dirt. Its composition and preparation are given below.

Table 1

Synthetic dirt

Ingredients % »

Hyfac 430 ^a '. 1.37.

Lauric acid 1.42

Neo-fat 14 ^c Neo-fat 18 ^d Neo-fat 90 ^{e f} Industrene2269 Paraffin wax Squalane Lanolin anhydrous Coconut oil Tallow

5.68

11.16

5.40

9.81

1.26

7.30 3,70

19.40

3.30 29,70

100.00% a

Bc

d e

f g

h

Emery Industries, Inc., Cincinnati, Ohio Emery Industries, Inc., Cincinnati, Ohio

Industrial Chemical What., Chicago, Illinois Industrial Chemical Co · / Chicago, Illinois Industrial Chemical What. / Chicago, Illinois Industrial Chemical What., Chicago, Illinois

Humko Products, Meraphis, Tennessee Robeco Chemical, Inc., New York, New York

Method

1. Heat the above compounds with continuous stirring at 71.1 to 76.7 ° C

2. Mix 25 parts of the above kit with 25 parts soap solution, 5 to 80% tallow / 20% coconut, and 50 parts distilled water at 65.5 ° C

3. Cool the mixture to room temperature with stirring.

4. Store in a covered glass container.

Equipment

The following devices are used:

1. Temperature Controlled Water Sink Water Source · The water source should have a medium hardness (0.1 to 15 g / l) for most of the test, but water with less or greater hardness may be used for special purposes.

2. Synthetic dirt (see Table 1).

3. Paper towels.

4. Test sticks.

5. Control sticks.

Method

The procedure is as follows:

1. Set the temperature to 32-37 ° C.

2. Spread 0.22 ml of dirt on the hands.

3. Hands get wet.

4. The bar is rotated 3 times in both hands.

5. Add a little water and rub your hands 5 times.

6. Turn the hands 3 times (without soap), instant volume.

7. Rotates 7 times more, cleavage for final volume.

3. Collects the foam and settles from the sink.

9. Compare the volume to the standard target stick volume and determine the grade.

Scale

Loaded with dirt

- Exceptional

5-0 much higher than the target

- Higher than target

- Target volume

- Slightly lower than the target

- Lower than the target

In vitro skin wall penetration test (softness)

This assay is performed as described in (J.S. Pat.

312,253, Smali et al., Issued March 14, 1989.

Materials that contribute to improving processability often have adverse effects, especially when it comes to the fineness of the product. Referring to Table 2 and using the layer damage detection method to determine product fineness, cetaryl sulphate as an individual raw material exhibits surprisingly greater fineness than the particularly fine cocoglyceryl ether sulfonate as well as shorter-chain AS, sodium dodecyl sulphate. The lower the number in Table 2, the milder the finer the product.

Table 2

Mg transferred

Water

Sodium cataryl sulphate

Cocoglycarylathersuifonate sedný

0 ', 137 0.302 0.453

Sodium dodecyl sulphate Sodium laurate

1, 289, 1.805

Process for the production of synthetic bars Crutching * *

1. Place molten sodium cetra sulphate in a vertical axis mixer.

2. Add the specified amount of Hamposyl L-30 solution to the machine.

3. Add the specified amount of AGS paste, which can be at room temperature or preheated to 65 ° C, in the machine.

4. Start the stirrer and circulation pump and maintain the temperature in the machine at 54 to 65 ° C by regulating the steam and water valves.

5. Allow the mixer to cool to 54 to 65 ° C before adding a predetermined amount of stearic acid.

6. Add a specified amount of soap or NaOH to the heated mixture in the mixer to form soap, in situ.

7. The contents of the mixer are allowed to stir and / or react for about 15 minutes while maintaining the temperature at 54-65 ° C.

8. Add sodium chloride as a plasticizer and titanium dioxide to the heated mixer.

9. Add lauric and / or coconut fatty acid to the mixture and allow the contents of the machine to stir for about 15 minutes while maintaining the temperature at 54-65 ° C.

10. Add molten paraffin wax and mix for about half an hour until uniform.

The stirred mixture is dried and cooled using a flash chamber and a cooling roller or belt. The stirred mixture is first heated to about 149 ° C with a heat exchanger and then dried by evaporation in a chamber above the cooling cylinder or cooling belt. From the evaporation chamber, the hot dried mixture is extruded onto a cooling roller or belt. A uniform, thin, cold (29-35 ° C) product in the form of flakes or shavings is obtained from the cooling roll or belt.

The flakes generally contain 1 to 10% moisture, preferably up to about 4.5%. The humidity can be controlled primarily by increasing or decreasing the vapor pressure in the heat exchanger, by increasing or decreasing the stirring speed, in the heat exchanger, and by increasing or decreasing the stirring temperature of the mixture in the heat exchanger.

in _xx

The flakes are discarded and mixed in a batch amalgamator to

A uniform flake size was obtained with S. A weighed amount of perfume is added to the flakes and mixed in an amalgamator to form the final product with the desired perfume level. The perfumed flakes are delivered to a hopper or directly to a screw press.

The grinding takes place in a 3-roll soap mill whose first roller is heated to 49 ° C and the second two rollers to about 7 ° C. The material passes through the mill several times to obtain a homogeneous mixture of perfumed and dry flakes.

^IE mixture is further compressed and stamped. the screw press is set to a jacket temperature of about 46 ° C and the head temperature is 45 to 50 ° C. An ideal screw press is a two-stage press allowing the application of a vacuum of about 50 to 83.1 KPa. The rods are cut into 125 millimeter sections and punched with a cold die using a liquor such as alcohol, if appropriate.

DETAILED DESCRIPTION OF THE INVENTION

The following sets and examples are illustrative without limiting the scope of the invention. Methods for making knurled bars are well known. All amounts and ranges, temperatures, results, etc., as used herein, are intended to be approximations unless otherwise indicated. The bars of the invention in the present compositions and examples have a ?H of about 7 to 7.5.

The water level in the synthetic rods stabilizes at about 3.75% to 2-3% when stored.

Comparative Test Set A represents a control bar for evaluating the foaming and / or lubricity of the bar of the invention. Comparative assembly A is typically an alkyl sulphate-based product discussed in U.S. Pat. U.S. Pat. No. 07 / 605,614, supra. The assemblies described below have improved brightness compared to comparative assembly A without compromising processability. In some cases of assemblies 1 to 7, the foam volume has decreased. These kits are included to illustrate the scope of the invention. Acceptable levels of suds sudsing are 3.0 or greater.

Assembly 1 is characterized by improved lubricity (lower numbers) after addition of 21% paraffin wax as compared to Comparative Assembly A. See bottom of Table 3. Assembly 1 to 3 illustrates the surprising benefit that paraffin wax can impart to synthetic rods containing long chain alkyl sulphate. Assembly 2 further demonstrates that paraffin wax having a higher melting point (69 ° C) than the wax used in assembly 1 still provides improved lubricity, but without greater detriment to foaming, which lower paraffin wax (59 ° C) causes in assembly 1 Assembly 1 comprises a mixture of two paraffins and has intermediate properties between assembly 2 and 2.

Table 3

Assembly, weight%

Component comparative 1 2 3 Sodium cetaryl sulphate 30.5 20.0 20.0 20.0 Sodium Lauroylsarcosinate 12.0 12.0 12.0 12.0 Sodium cocoglyceryl ether sulphonate 16.0 20.0 20.0 20.0 Sodium soap (in kit) 7.5 5.0 5.0 5.0 Stearic acid 13.0 8.7 8.7 8.7 Lauric acid 6.0 4.3 4.3 4.4 Paraffin (m.p. 59 ° C) - 21.0 - 6.0 Paraffin (m.p. 69 ° C) - - 21.0 15.0 PEG-150 10.0 4.0 4.0 4.0 Perfume 1.0 1.0 1.0 1.0 Titanium dioxide 0.25 0.25 0.25 0.25 Water 3.75 3.75 3.75 3.75 Specifications Avg. frothiness 4.4 0.5 3.0 2.8 sweetness, damp 4.3 1,8 3.8 2.5 Stubbornness, dry 2.2 1.1 1.7 1.5 S e s t and v a , h m o t. % Component 4 5 6 7 Sodium cetaryl sulphate 20.0 20.0 20.0 19.0 Sodium Lauroylsarcosinate 12.0 12.0 12.0 13.0 Sodium cocoglyceryl ether sulphonate 24.0 20.0 24.0 24.0 Sodium soaps (in kit) 5.0 5.0 5.0 5.0 stearic acid 8.7 4.3 4.3 4.3 Lauric acid 4.3 8.7 8.7 ' 8.7

Paraffin (m.p.59 ° C) - - - - Paraffin (m.p. 69 ° C) 21.0 21.0 21.0 21.0 PEG-150 - 4.0 - - Perfume 1.0 1.0 1.0 1.0 Titanium dioxide 0.25 * 0.25 0.25 0.25 Water 3.75 3.75 3.75 3.75 Specifications Avg. frothiness 3.0 3.0 3.5 4.0 Stubbornness, wet 3.3 3.1 2.3 3.2 Stubbornness, dry 1.6 1, 5 1.3 1.6 Assemblies 4 to 6

Kits 4-6 illustrate the effects of plasticisers such as polyethylene glycol (PEG) on paraffin containing a long chain alkyl sulfate matrix. Assembly 4 has a lower (better) lubricity (3.3 / 1.6 vs. 3.8 / 1.7) than assembly 2, the difference being the presence of PEG in assembly 2. This improvement in lubricity is achieved without adversely affecting the foam volume (3.0 / 3.0). Assemblies 5 and 6 differ in a similar manner: assembly 6 (without PEG) has better lubricity than assembly 5. Surprisingly, assembly 6 also has better foaming.

Sestava 7

Assembly 7 demonstrates that foaming can be further improved by increasing the level of high-foaming synthetic surfactants (Assembly 6 with 12% versus Assembly 7 with 13%), such as sodium lauroyl sarcosinate, surprisingly without significantly impairing the lubricity (Assembly 6 with 3.5 friability against assembly 7 with frothing 4.0 and assembly 6 with lubricity 2.3 and 1.3 against assembly 7 with lubricity

3.2 and 1.6).

Both assemblies 6 and 7 are very suitable for synthetic sticks that have very good foaming and improved lubricity while still being easy to process.

Example 1

Example 1 represents a very preferred personal cleansing bar according to the invention. It is the same composition as in assembly 6, except that sodium cocoyl isethionate (SCI) is used instead of sodium coclyl ether ether sulfonate (AGS).

Examples 2 and 3 * '

Example 2 is similar to Example 1 except that 5% less cocoyl isethionate is used and 5% sodium isethionate is used. Example 3 is similar to Example 1 except that a mixture of lauric and coconut fatty acids is used and less lauric acid is used.

Examples 1 to 3 retain all the advantages of the assembly 6, but replacing the AGS with SCI results in a rod with significantly better processability. In particular, the product is somewhat softer during extrusion, the flakes are more loose and the product (bar) is somewhat less sticky. These differences result in improved processability and improved personal cleansing bar.

Table 4

Ex ad no, wt. % Component 1 2 3 Sodium cetarylslran 20.0 20.0 20.0 Sodium Lauroylsarcosinate 12.0 12.0 12.0 Sodium cocoyl isethionate 24.0 19.0 24.0 Sodium isethionate - 5.0 - Sodium soap (in kit) 5.0 5.0 5.0 Stearic acid 4.3 4.3 4.3 Lauric acid 8.7 3.7 8.7 Coconut fatty acid - - 3.0 Paraffin (m.p. 69 ° C) 21.0 21.0 21.0 Perfume 1.0 1.0 1.0 Titanium dioxide 0.25 0.25 0.25 Water 3.75 3.75 3.75 Technical data Avg. frothiness .3,3 ON ON Stubbornness, wet 3.2 ON ON Mazlavost 1.9 ' ON ON

Claims (10)

A personal cleansing bar comprising 10 to 40% by weight of a substantially saturated long chain C16-22 alkyl sulphate: 10 to 40% by weight of paraffin wax with a melting point of 54 to 82 ° C; 15 to 40% by weight of a foaming mild synthetic surfactant selected from the group consisting of C12-14 isethionate, C12-14 alkyl glyceryl ether sulfonate. sodium lauroyl sarcosinate and mixtures thereof: 8 to 25% by weight of free fatty acid; 2 to 15% by weight of soap and 1.5 to 10% by weight of water; the bars form a mild foaming C12-14 alkyl isethionate. 2. A personal cleansing bar comprising 15 to 35% by weight of a saturated long chain C 1-6 alkyl sulphate; 3 to 12 wt. soaps; 18 to 35 wt. foamy mirné. % surfactants: 13 to 35 wt. % paraffin wax having a melting point of 60-74 ° C and 2-8 wt. water, wherein the lauric (C12) and stearic (Cie-ie) free fatty acids are in a ratio of 2.5: 1 to 1: 2 and said free fatty acids are present in an amount of 10 to 20% by weight. and said bar has a pH of 4 to 9. 3. A personal cleansing bar comprising 10 to 40 wt. a substantially saturated long chain (C 1 -C 22 alkyl) synthetic surfactant selected from the group consisting of alkylsulfan. acylisethionate. alkyl sarcosinate, alkyl glyceryl ether sulfonate and mixtures thereof; 10 to 40 wt. paraffin wax having a melting point of 54-82 ° C; 15 to 40 wt. foaming mild synthetic surfactants selected from the group consisting of C12-14 isethionate. C12-14 alkyl glyceryl ether sulfonate. % sodium lauroyl sarcosinate and mixtures thereof, wherein at least 10 wt. the bars form a mild foaming C12-14 alkyl isethionate: 8 to 25 wt. free fatty acids? 2 to 15 wt. soaps and 1.5 to 10 wt. CC - 21 A personal cleansing stick according to claim 1, 2 or 3. characterized in that said wax has a melting point of 60 to 74 ° C, preferably 61 to 71 ° C. A personal cleansing bar according to claim 1 or 3, characterized in that it contains from 10 to 20% by weight of water. free fatty acids, preferably a 3: 1 to 1: 3 mixture of lauric (C12) and stearic (Cie-19) acids. 6. The personal cleansing bar of claim 5 wherein the ratio of lauric acid to stearic acid is 2.5; 1 to 1: 2. A personal cleansing stick according to claim 1, 2, 3, 4 or 5, characterized in that the foaming mild synthetic surfactant is selected from C12-14 alkyl glyceryl ether sulfonate and sodium lauroyl sarcosinate and mixtures thereof. 8. The personal cleansing bar of claim 7, wherein the ratio of the C12-14 alkyl isethionate to sodium lauroyl sarcosinate is from 1: 1 to 1: 1. 3: 1, preferably 1.5: 1 to 2.5: 1. A personal cleansing bar according to claim 1, 2, 3, 5, 6, 7 or 8, characterized in that. The melting point of the wax is 61-71 ° C. the water content is 2 to 4 wt. and pr is 6.5 to 7.5, wherein the long-chain synthetic surfactant is a mixture of C 18-18 alkyl sulphate and C 18-18 acyl isethionate. 10. A personal cleansing bar as claimed in claim 9 comprising from 10 to 20 wt. the free fatty acid and the long chain synthetic surfactant is predominantly Cie-acyisethionate.