GB2334724A

GB2334724A - Washing composition with silicone and inorganic benefit agent

Info

Publication number: GB2334724A
Application number: GB9904220A
Authority: GB
Inventors: May Wai Kun Yang; Emma Pawson; Simon Foster
Original assignee: Cussons International Ltd
Current assignee: Cussons International Ltd
Priority date: 1998-02-25
Filing date: 1999-02-25
Publication date: 1999-09-01
Anticipated expiration: 2019-02-25
Also published as: AU759554B2; GB9904220D0; GB2334724B; AU1843099A; GB9803831D0

Abstract

A washing composition which uses silicone as part of a delivery system in order to impart a quantity of inorganic material onto the skin and/or hair. The washing composition, which may be in the form of a bar, comprises at least one surface active agent, at lease one inorganic material and silicone for the delivery of the inorganic material. The inorganic material provides any of the following benefits: deodorising, anti-bacterial anti-dandruff, absorbant, skin smoothing, oil emulsifying or abrasive.

Description

WASHING COMPOSITION The present invention relates to washing compositions, and particularly but not exclusively to washing compositions in the form of bars.

The use of specific polymers to deposit materials onto the skin is well known. For example, EP 0231997 proposes the use of polyacrylamides for increased deposition. WO 95/22311 describes a personal washing composition comprising a surface active agent and, a cationic deposition polymer. This polymer is used to deposit various benefit agents such as silicone oil onto the skin or hair. Silicone itself has been included in various washing compositions as an active component thereof. WO 94/17172 describes the use of silicone to aid processability, reduce tackiness and facilitate improvements in processing. US 5,441,671 and WO 95/23838 describe the use of silicone as part of a moisturiser or a moisturiser blend.

In WO 92/08444 silicone is used as a skin free agent and a processing aid and in EP 0578481 silicone is used in cleansing bars to condition hair and skin and to improve processing and bar properties.

The present invention involves a new use for silicone in washing compositions.

According to the present invention there is provided the use of silicone, in a washing composition comprising at least one surface active agent and at least one inorganic material, as a deposition aid for at least one of the said inorganic materials.

Surprisingly it has been found that silicone can be used as a delivery vehicle to deliver inorganic material onto the skin and/or hair from rinse off washing compositions. The surface active agents are used as a cleanser.

The silicone is used to deliver the inorganic materials to the skin and/or hair, those materials providing a benefit such as ultra-violet protection, abraisive properties, deodorising properties, anti-bacterial properties, anti-dandruff properties, absorbant properties, skin smoothing properties and/or oil emulsifying properties The washing compositions of the invention preferably comprise from 0.1 to 20% by weight of silicone.

Preferred silicones include any of the following either alone or in combination: Dimethicone (of preferred viscosity 60,000cp-600,000cp), Stearyldimethicone, Cetyl Dimethicone, Dimethiconol, Cetearyl Methicone, Trimethyl siloxy silicate and Dimethicone (preferably as a resin/fluid blend), A trimethyl siloxy silicate and Cyclodimethicone blend, or Phenyltrimethicone.

The washing composition of the invention preferably comprise from 0.01% to 10% by weight of the inorganic material for providing a skin and/or hair benefit.

Preferred examples of such inorganic materials (accompanied by their skin and/or hair benefit) are listed below. These inorganic materials can be used either alone or in combination: Titanium dioxide, Zinc oxide, Tin oxide and derivatives thereof (UV screening agents); Calcium carbonate, Magnesium carbonate, Aluminium silicate, Hydrated silica, Silica and sodium bicarbonate (abraisive/skin smoothing agents); Silver coated titanium dioxide (anti-bacterial agent); Zinc pyrithione and selenium sulphide (anti-dandruff agents); Kaolin (absorbant/abraisive agent); Talc (skin smoothing agent); and Bentonite (oil emulisfying agent).

Ideally, the washing compositions of the invention comprise from 0.01% to 10% by weight of a further active material for providing a skin and/or hair benefit.

Preferred examples of said further active materials are listed below.

These examples can be used either alone or in combination:a) Fats and oils including natural fats and oils, such as jojoba, b) Waxes, such as paraffin wax and beeswax, c) Hydrocarbons, such as mineral oil or petrolatum, d) Fatty acids or fatty alcohols, either saturated and/or unsaturated having a carbon chain length in the range C12 and C22, e) Aldehydes, ketones, esters, such as isopropyl myristate, f) Essential oils, such as evening primrose oils, g) Lipids, such as cholesterol, h) Anti-bacterial agent (organic based), i) Vitamins, such as Vitamin A, E or panthenol, or j) Sunscreens such as octyl or methoxyl cinnamate.

The washing composition of the invention preferably comprise up to 95% by weight of said surface active agent. Preferably there is at least one soap either alone or in combination with at least one secondary surfactant.

The secondary surfactant is preferably anionic or non-ionic. Preferred examples of suitable "bases" which contain the surface active agent for the washing compositions are set out below. The washing compositions preferably comprise from 70% to 95% by weight of one of said bases.

Base 1 Soap Base 2 30-90% wt. Soap, 1-35% wt. Secondary surfactant, and two of the following three ingredients 1-25% wt. Fatty acid, 1-25% wt. Fatty Alcohol, 1-25% wt. Hydrocarbon wax.

Base 3 1-50% wt. of the total composition of surfactant material, 10-80% wt. water insoluble materials.

5-45% wt. blend of at least two PEG (polyethylene glycol) materials' in a ratio 1:10 to 10:1 of different MW, one in the range from 500-3000 MW and one in the range from 3000 20,000 MW.

Base 4 5-40% wt. of a surfactant system comprising at least one anionic surfactant and 0-20% wt. non-ionic surfactant (preferably chosen from alcohol ethoxylates, alkyl polyglucosides, fatty acid) and 0-20% wt. amphotertic surfactant.

In a preferred embodiment of the invention the washing compositions are provided in bar form.

Any of a number of minor ingredients may be additionally incorporated into the washing compositions of the invention in an amount as would be conventional in the art. Examples of such materials are listed below. a) Optical brighteners and other materials known to improve the appearance of cleansing bars, b) Additives known in the art to be effective for helping processing, e.g. PEG materials, c) Inorganic salts to improve processability, bar hardness and reducing mush e.g. magnesium sulphate, sodium chloride, d) Preservative systems, e) Water, f) Filler materials used for cost reduction, g) Water softeners, h) Opacifiers and colourants, i) Detergency builders, or j) Perfume.

The washing compositions of the invention may be prepared in a number of ways. Generally the silicone is pre-mixed with the said further active material before addition to the surface active agent base.

In one example, when using base 1 above the silicone/further active pre-mix is added to the base before milling and is then extruded and stamped into bars. This is consequently a simple modification of the conventional soap bar making process.

In a further example, when using base 2 above the method involves adding the emollients, i.e. fatty acid, fatty alcohol and hydrocarbon wax, in a molten state to liquid soap which is then dried to form a base. The silicone/further active pre-mix and any additional minor ingredients such as perfume or titanium dioxide are then added at this stage and then the composition is milled, plodded and extruded into bars.

In a still further example, when using base 3 standard soap finishing bars are preferably used. The water insoluble materials (if solid) and PEG are melted and the surfactant material is then added to the molten mixture. The mixture is then cooled and either milled or run through a plodder to form noodles. Any minor ingredients may be added at this stage, such as perfume, titanium dioxide or finished soap noodles. The silicone/further active pre-mix is also added at this stage. The composition is then finished on a standard soap finishing line, is then compressed in a plodder and is extruded as a billet and cut and stamped into bars.

In yet another example, when using base 4 the nonionics (if solid) are melted and the surfactant material is added. The mixture is cooled slightly and the silicone/further active pre-mix is added along with all other minor ingredients such as titanium dioxide and perfume. The molten mixture is poured into moulds and allowed to set. Alternatively it may be poured into trays, allowed to set and cut into blocks and stamped.

In order that the present invention may be more readily understood it will be described by way of example only with reference to the accompanying graph marked Fig.1..

Elemental analysis The objective of this method was to determine and compare the level of Titanium Dioxide being deposited onto the skin from a rinse off product in accordance with the present invention with a control.

Product Formulation Premix Dimethicone 60,000cp 66.67% Titanium Dioxide (microfine) 33.33% Base Cetyl Alcohol 26.5% Stearic Acid 26.2% Paraffin Wax 8.2% Soap 25.5% Synperinic A7 4.5% Sodium Chloride 1.1 % Water 3.9% Glycerine 2.0% Perfume 1.0% EDTA 0.1% Method of Prenaration The titanium dioxide and the silicone delivery system are premixed in a standard Heildolph type mixer. The base is made up by using conventional blending techniques.

27% wt. of the premix is added to 73% wt. of the base and is processed into a bar form by using a hot melt process. A hot melt process is where the ingredients are added hot and allowed to cool before cutting and stamping.

Method of Analysis This method of analysis is used extensively in the art to quantify level of metals present in a sample. e.g. titanium.

The product was used to wash a set number of panellists' forearms in a standard way. The washed area was controlled. The product left on the skin after washing was collected by means of sellotape stripping. A suitable solvent was employed to dissolve the washing and then analysed by elemental analysis. In this way all of the titanium on the specified area of skin was quantified and by comparison to a leave on a control spf 2 product the sun protection factor (spf) was assessed.

Controls Spf 2 cream (leave on product) Spf 4 cream (leave on product) Product without silicone? Results The graph of Fig.1 shows that the washing product comprising silicone was found to deposit more titanium dioxide onto the skin when compared to an spf 2 product.

Claims

CLAIMS 1. The use of silicone, in a washing composition comprising at least one surface active agent and at least one inorganic material, as a deposition aid for at least one of the said inorganic materials.
2. The use of silicone in a washing composition as claimed in claim 1, wherein the washing composition comprises from 0.1 to 20% by weight of said silicone.
3. The use of silicone in a washing composition as claimed in claim 1 or claim 2, wherein the said silicone comprises any of the following either alone or in combination:- dimethicone, stearyldimethicone, cetyl dimethicone, dimethiconol, cetearyl methicone, a blend of trimethyl siloxy silicate and dimethicone, a blend of trimethyl siloxy silicate and cyclodimethicone blend and phenyltrimethicone.
4. The use of silicone in a washing composition as claimed in any preceding claim, wherein the composition comprises from 0.01 % to 10% by weight of said inorganic material.
5. The use of a silicone in a washing composition as claimed in any preceding claim, wherein the said inorganic material provides ultra violet protection.
6. The use of a silicone in a washing composition as claimed in any preceding claim, wherein the said inorganic material provides at least one of the following: abraisive; deodorising; anti-bacterial; anti-dandruff; absorbant; skin smoothing; and/or oil emulsifying properties.
7. The use of silicone in a washing composition as claimed in any preceding claim, wherein the said inorganic material comprises any of the following either alone or in combination:- titanium dioxide, zinc oxide, tin oxide and derivatives thereof, calcium carbonate, magnesium carbonate, aluminium silicate, hydrated silica, silica, sodium bicarbonate, aluminium chloride, a zeolite, silver coated titanium dioxide, zinc pyrithione, selenium sulphate, kaolin, talc and/or bentonite.
8. The use of silicone in a washing composition as claimed in any preceding claim, wherein the composition comprises from 0.01 % to 10% by weight of a further active material.
9. The use of silicone in a washing composition as claimed in claim 8, wherein said further active material provides at least one of the following: ultra-violet protection; skin moisturisation; and/or germ removal.
10. The use of a silicone in a washing composition as claimed in claim 8 or claim 9, wherein the said further active material comprises any of the following either alone or in combination:- fat, oil, was, hydrocarbon, fatty acid, fatty alcohol, ester, aldehyde, ketone, essential oil, lipid, antibacterial agent, vitamin, titanium dioxidem, octyl or methoxyl cinnamate.
11. The use of a silicone in a washing composition as claimed in any of the preceding claims, wherein the washing composition comprises from 70% to 95% by weight of one of the following: i) Soap ii) 30-90% wt. Soap, 1-35% wt. Secondary surfactant, and two of the following three ingredients 1-25% wt. Fatty acid, 1-25% wt. Fatty Alcohol, 1-25% wt. Hydrocarbon wax. iii) 1-50% wt. of the total composition of surfactant material, 10-80% wt. water insoluble materials.

5-45% wt. blend of at least two polyethylene glycol materials in a ratio 1:10 to 10:1 of different MW, one in the range from 500-3000 MW and one in the range from 3000 20,000 MW. iv) 5-40% wt. of a surfactant system comprising at least one anionic surfactant and 0-20% wt. non-ionic surfactant and 0-20 wt. amphoteric surfactant.

1 2. The use of a silicone in a washing composition as claimed in any preceding claims, wherein the washing composition is provided in bar form.