EP4065066A1

EP4065066A1 - Solid cosmetic composition comprising luminescent zinc sulphide

Info

Publication number: EP4065066A1
Application number: EP20819829.1A
Authority: EP
Inventors: Mark Constantine; Margaret Joan Constantine; Helen Elizabeth Ambrosen; Alessandro COMMISSO; Gary SHEARS; David Jason MULLER
Original assignee: Cosmetic Warriors Ltd
Current assignee: Cosmetic Warriors Ltd
Priority date: 2019-11-26
Filing date: 2020-11-25
Publication date: 2022-10-05
Also published as: WO2021105666A1; GB201917191D0

Abstract

The present invention provides a solid cosmetic product comprising (i) a zinc sulphide containing component comprising (a) a carrier material; and (b) luminescent zinc sulphide; (ii) a solid cosmetic component wherein the solid cosmetic component and the zinc sulphide containing component are distinct from each other.

Description

SOLID COSMETIC COMPOSITION COMPRISING LUMINESCENT ZINC SULPHIDE

FIELD OF THE INVENTION

The present invention relates to a solid cosmetic product, a process for producing said product, and a product prepared by the method.

BACKGROUND TO THE INVENTION

The present invention relates to products particularly those for use in contact with the human body.

In the modern era, a high proportion of cosmetic products are typically provided to consumers in the form of liquid or pastes. For example, hair styling products are typically provided as hair gels or pastes, which require packaging in order to transport and store said products. Oral care (or oral hygiene) products, such as toothpastes and mouthwashes, are also either provided in paste or liquid form, thus requiring some form of external packaging. They are sold in containers to the end user and may be dispensed by the end user. However, the required use of packaging is a disadvantage. From an environmental perspective, waste packaging is a significant problem, despite the availability of recycling.

There is also a desire to provide more ‘exciting’ products which add to the bathing, cleansing and/or grooming experience of a user. In other words, there is a desire to provide products which offer to the user more than the functional delivery of a cosmetically active agent.

One popular cosmetic product which is both solid and provides a more ‘exciting’ product than its predecessor is the Bath Bomb. Bath bomb type products may be considered a form of bath salt as they typically comprises at least one salt of carbonic acid, and at least one acidifying agent. When a bath bomb is placed into water, it vigorously effervesces releasing carbon dioxide. The reaction is an acid-base reaction resulting in the production of a salt, carbon dioxide and water. Other more recent solid products, particularly those developed by the present applicant include solid shower gels, solid shampoos, solid hair conditioners, solid hair dye, solid body lotions, solid massage bars, shower jellies, solid moisturisers, solid body scrubs, solid bubble bars for creating bubble baths, solid sunscreens, and solid make-up. While many of these products address the issue of avoiding unnecessary packaging, and while many of them have their own unique user experiences, there is a desire to improve the user experience.

The present invention seeks to provide a solid cosmetic product which provides an enhanced experience for the user.

SUMMARY OF THE INVENTION

In a first aspect, there is provided a solid cosmetic product comprising

(i) a zinc sulphide containing component comprising

(a) a carrier material; and

(b) luminescent zinc sulphide;

(ii) a solid cosmetic component; wherein the solid cosmetic component and the zinc sulphide containing component are distinct from each other.

In a second aspect, there is provided a process for the production of a solid cosmetic product as defined herein comprising the steps of: i) preparing the zinc sulphide containing component in one or more pieces and preparing the solid cosmetic component; ii) (a) enveloping the one or more pieces of zinc sulphide containing component with the solid cosmetic component; or

(b) applying the one or more pieces of zinc sulphide containing component to the outside of the solid cosmetic component.

In a third aspect, there is provided a product obtained or obtainable by a process as described herein.

In a fourth aspect, there is provided a cosmetic method comprising contacting the skin of a user with a solid cosmetic product as described herein.

For ease of reference, these and further aspects of the present invention are now discussed under appropriate section headings. However, the teachings under each section are not necessarily limited to each particular section. Advantages

It has been found that in the solid cosmetic product of the present invention in which there is provided zinc sulphide containing component and a solid cosmetic component, a user of a solid cosmetic product may be provided with a desirable product in which the solid cosmetic component provides the cosmetic effect for which the product has been purchased and the zinc sulphide containing component provides an enhanced visual effect. In particular, in use the zinc sulphide containing component either becomes exposed during use (when surrounded by the solid cosmetic component) or is present on the surface of the solid cosmetic component, the zinc sulphide containing component will be illuminated by light present in the environment. This will cause the luminescent zinc sulphide in the zinc sulphide containing component to ‘glow’. This glow may be more apparent if the illuminating light is then reduced, for example by turning off an artificial light. Thus, the user will be provided with components in the cosmetic product which ‘glow-in- the-dark’. This provides an enhanced user experience. This user experience can be enhanced further with thematic products such as Halloween products. Although some glow-in-the-dark products are known, the dual effect of the solid cosmetic component effervescing and the separate glowing component, produces a highly appealing visual display.

DETAILED DESCRIPTION

Composition

As discussed herein, in one aspect of the present invention, there is provided a solid cosmetic product comprising

(i) a zinc sulphide containing component comprising

(a) a carrier material; and

(b) luminescent zinc sulphide;

It will be understood by one skilled in the art that the nature of a cosmetic product means that the product is not edible. Thus in a further aspect the present invention provides a non edible solid cosmetic product comprising (i) a zinc sulphide containing component comprising

(a) a carrier material; and

(b) luminescent zinc sulphide;

The solid products of the present invention are compositions which can substantially sustain their physical shape when unsupported by external means, e.g. packaging etc. Thus, they are considered to be solid, solid-like, in solid form or in solid-like form at room temperature. For the avoidance of doubt the solid product must remain substantially solid at up to 30°C.

By solid-like, it is understood that some materials are considered on a day to day basis to be solid, yet over an extremely long period of time, may alter in shape, e.g. amorphous materials such as glass etc. However, they are considered to be solid-like as, for the purpose they fulfil, they are solid.

Due to the solid form of the compositions of the present invention, external packaging is not required to maintain the shape of the composition.

The composition of the present invention is typically made by moulding of the product. In a typical process, both the solid cosmetic component and the zinc sulphide containing component are prepared and contacted with each other. Two possible methods are as follows.

In one aspect the zinc sulphide containing component is in one or more distinct pieces which are entirely enveloped by the solid cosmetic component. In one aspect the zinc sulphide containing component is a single piece which is entirely enveloped by the solid cosmetic component.

In one preferred aspect the zinc sulphide containing component is in one or more distinct pieces disposed on the outside of the solid cosmetic component. In one preferred aspect the zinc sulphide containing component is in multiple distinct pieces disposed on the outside of the solid cosmetic component. Zinc sulphide containinq component

As discussed herein, the zinc sulphide containing component comprises (a) a carrier material; and (b) luminescent zinc sulphide.

The carrier material contained in the zinc sulphide containing component may be any suitable carrier material.

In one aspect the zinc sulphide containing component floats on water at 37°C. In this aspect, the carrier material contained in the zinc sulphide containing component may be any suitable carrier material selected to achieve the requirement that the zinc sulphide containing component floats on water at 37°C. One skilled in the art would readily understand how to select a necessary carrier material. In particular, one skilled in the art would understand to select a carrier material which either itself has a density of less than 0.993g/cm³ at 37°C or is in a form such that it provides a solid having a density of less than 0.993g/cm³ at 37°C. An example of the latter would be a material which may have a density of greater than 0.993g/cm³ at 37°C but which has been aerated to provide an overall density of less than 0.993g/cm³ at 37°C. It is noted that water has a density of 0.99336g/cm³ at 37°C.

In one aspect the carrier material has a density of less than 0.6g/cm³ at 37°C. In one aspect the carrier material has a density of less than 0.65g/cm³ at 37°C. In one aspect the carrier material has a density of less than 0.7g/cm³ at 37°C. In one aspect the carrier material has a density of less than 0.75g/cm³ at 37°C. In one aspect the carrier material has a density of less than 0.8g/cm³ at 37°C. In one aspect the carrier material has a density of less than 0.85g/cm³ at 37°C. In one aspect the carrier material has a density of less than 0.9g/cm³ at 37°C. In one aspect the carrier material has a density of less than 0.993g/cm³ at 37°C.

In one aspect the zinc sulphide containing component has a density of less than 0.6g/cm³ at 37°C. In one aspect the zinc sulphide containing component has a density of less than 0.65g/cm³ at 37°C. In one aspect the zinc sulphide containing component has a density of less than 0.7g/cm³ at 37°C. In one aspect the zinc sulphide containing component has a density of less than 0.75g/cm³ at 37°C. In one aspect the zinc sulphide containing component has a density of less than 0.8g/cm³ at 37°C. In one aspect the zinc sulphide containing component has a density of less than 0.85g/cm³ at 37°C. In one aspect the zinc sulphide containing component has a density of less than 0.9g/cm³ at 37°C. In one aspect the zinc sulphide containing component has a density of less than 0.993g/cm³ at 37°C.

In one aspect the carrier material may be selected such that it remains solid in the bathing water. Thus, in one aspect the carrier material has a melting point of at least 37°C. In one aspect the carrier material has a melting point of at least 40°C. In one aspect the carrier material has a melting point of at least 45°C. In one aspect the carrier material has a melting point of at least 50°C. In one aspect the carrier material has a melting point of at least 55°C. In one aspect the carrier material has a melting point of at least 60°C. Although some of these temperatures are significantly higher than a safe temperature for bathing water, the melting point of the carrier material may be selected to allow for a user to run bathing water which is too hot, place the solid cosmetic product in the bathing water, and then allow the bathing water to cool before use.

In one aspect the carrier material is selected from waxes, paper, wood, bark, sponge, plastics, soaps, synthetic detergents, vegetable butters, clays and mixtures thereof. In one aspect the carrier material is selected from waxes, paper, wood, bark, sponge and mixtures thereof.

We have found that waxes are particularly advantageous as carrier materials. In particular, these materials may have suitably high melting points and have densities low enough to allow the incorporation of significant amounts of zinc sulphide before the density of the overall zinc sulphide containing component becomes greater than 0.993g/cm³ at 37°C. It is noted that the density of zinc sulphide is approximately 4g/cm³. In one aspect there is provided a solid cosmetic product wherein the carrier material is selected from waxes and mixtures thereof.

Waxes for use in the present invention may be selected from any suitable waxes. In one aspect the waxes are selected from carnauba wax, castor wax, Fischer-Tropsch wax, hydrogenated castor oil, soy wax, pillar wax, carnauba wax, sunflower wax, hard sunflower wax, candelilla wax, coconut wax, rapeseed wax, soft rapeseed wax, rice bran wax, japan wax, berry wax, beeswax, shellac wax and mixtures thereof.

In one aspect the carrier material is at least soy wax. In one aspect the carrier material contains waxes selected from soy wax. In one aspect the carrier material consists essentially of soy wax. In one aspect the carrier material consists of soy wax. Zinc sulphide, with addition of a suitable activator, exhibits luminescence. Luminescent zinc sulphide is currently used in many applications, including cathode ray tubes, X-ray screens and glow in the dark products. When silver is used as activator, the resulting colour is bright blue, at around 450 nanometers. Using manganese yields an orange-red colour at around 590 nanometers. Copper gives long lasting greenish glow. In one aspect the luminescent zinc sulphide is copper doped zinc sulphide.

The zinc sulphide containing component may contain luminescent zinc sulphide is any suitable amount. This amount may be selected by one skilled in the art to achieve the purposes of the present invention. In one aspect the zinc sulphide containing component contains luminescent zinc sulphide in an amount of 0.1 to 30 wt. %. In one aspect the zinc sulphide containing component contains luminescent zinc sulphide in an amount of 0.1 to 25 wt. %. In one aspect the zinc sulphide containing component contains luminescent zinc sulphide in an amount of 0.1 to 20 wt. %. In one aspect the zinc sulphide containing component contains luminescent zinc sulphide in an amount of 0.1 to 15 wt. %. In one aspect the zinc sulphide containing component contains luminescent zinc sulphide in an amount of 0.1 to 10 wt. %. In one aspect the zinc sulphide containing component contains luminescent zinc sulphide in an amount of 0.1 to 5 wt. %.

In one aspect the zinc sulphide containing component contains luminescent zinc sulphide in an amount of 1 to 30 wt. %. In one aspect the zinc sulphide containing component contains luminescent zinc sulphide in an amount of 1 to 25 wt. %. In one aspect the zinc sulphide containing component contains luminescent zinc sulphide in an amount of 1 to 20 wt. %. In one aspect the zinc sulphide containing component contains luminescent zinc sulphide in an amount of 1 to 15 wt. %. In one aspect the zinc sulphide containing component contains luminescent zinc sulphide in an amount of 1 to 10 wt. %. In one aspect the zinc sulphide containing component contains luminescent zinc sulphide in an amount of 1 to 5 wt. %.

In one aspect the zinc sulphide containing component contains carrier material in an amount of 70 to 99.9 wt. %. In one aspect the zinc sulphide containing component contains carrier material in an amount of 75 to 99.9 wt. %. In one aspect the zinc sulphide containing component contains carrier material in an amount of 80 to 99.9 wt. %. In one aspect the zinc sulphide containing component contains carrier material in an amount of 85 to 99.9 wt. %. In one aspect the zinc sulphide containing component contains carrier material in an amount of 90 to 99.9%. In one aspect the zinc sulphide containing component contains carrier material in an amount of 95 to 99.9 wt. %.

In one aspect the zinc sulphide containing component contains carrier material in an amount of 70 to 99 wt. %. In one aspect the zinc sulphide containing component contains carrier material in an amount of 75 to 99 wt. %. In one aspect the zinc sulphide containing component contains carrier material in an amount of 80 to 99 wt. %. In one aspect the zinc sulphide containing component contains carrier material in an amount of 85 to 99 wt. %. In one aspect the zinc sulphide containing component contains carrier material in an amount of 90 to 99%. In one aspect the zinc sulphide containing component contains carrier material in an amount of 95 to 99 wt. %.

In one aspect the zinc sulphide containing component contains luminescent zinc sulphide in an amount of 0.1 to 30 wt. % and carrier material in an amount of 70 to 99.9 wt. % based on the zinc sulphide containing component. In one aspect the zinc sulphide containing component contains luminescent zinc sulphide in an amount of 0.1 to 25 wt. % and carrier material in an amount of 75 to 99.9 wt. % based on the zinc sulphide containing component. In one aspect the zinc sulphide containing component contains luminescent zinc sulphide in an amount of 0.1 to 20 wt. % and carrier material in an amount of 80 to 99.9 wt. % based on the zinc sulphide containing component. In one aspect the zinc sulphide containing component contains luminescent zinc sulphide in an amount of 0.1 to 15 wt. % and carrier material in an amount of 85 to 99.9 wt. % based on the zinc sulphide containing component. In one aspect the zinc sulphide containing component contains luminescent zinc sulphide in an amount of 0.1 to 10 wt. % and carrier material in an amount of 90 to 99.9 wt. % based on the zinc sulphide containing component. In one aspect the zinc sulphide containing component contains luminescent zinc sulphide in an amount of 0.1 to 5 wt. % and carrier material in an amount of 95 to 99.9 wt. % based on the zinc sulphide containing component.

In one aspect the zinc sulphide containing component contains luminescent zinc sulphide in an amount of 1 to 30 wt. % and carrier material in an amount of 70 to 99 wt. % based on the zinc sulphide containing component. In one aspect the zinc sulphide containing component contains luminescent zinc sulphide in an amount of 1 to 25 wt. % and carrier material in an amount of 75 to 99 wt. % based on the zinc sulphide containing component. In one aspect the zinc sulphide containing component contains luminescent zinc sulphide in an amount of 1 to 20 wt. % and carrier material in an amount of 80 to 99 wt. % based on the zinc sulphide containing component. In one aspect the zinc sulphide containing component contains luminescent zinc sulphide in an amount of 1 to 15 wt. % and carrier material in an amount of 85 to 99 wt. % based on the zinc sulphide containing component. In one aspect the zinc sulphide containing component contains luminescent zinc sulphide in an amount of 1 to 10 wt. % and carrier material in an amount of 90 to 99 wt. % based on the zinc sulphide containing component. In one aspect the zinc sulphide containing component contains luminescent zinc sulphide in an amount of 1 to 5 wt. % and carrier material in an amount of 95 to 99 wt. % based on the zinc sulphide containing component.

The essential components of the zinc sulphide containing component are defined herein. However the composition may contain further additional components.

In a preferred aspect the zinc sulphide containing component does not include colouring. Preferably the zinc sulphide containing component comprises colouring in an amount of less than 1 wt.% based on the zinc sulphide containing component, such as in an amount of from less than 0.5 % based on the zinc sulphide containing component, such as in an amount of from less than 0.2 % based on the zinc sulphide containing component, such as in an amount of less than 0.1 % based on the zinc sulphide containing component, such as in an amount of less than 0.01 wt.% based on the zinc sulphide containing component, such as in an amount of less than 0.001 wt.% based on the zinc sulphide containing component.

In a preferred aspect the zinc sulphide containing component further comprises a fragrance. Preferably the fragrance is selected from essential oils. Preferably the fragrance, and more preferably the essential oil, is present in the zinc sulphide containing component in an amount of from 0.001 to 10 wt.% based on the zinc sulphide containing component, such as in an amount of from 0.001 to 8 wt.% based on the zinc sulphide containing component, such as in an amount of from 0.001 to 5 wt.% based on the zinc sulphide containing component, such as in an amount of from 1 to 5 wt.% based on the zinc sulphide containing component, such as in an amount of from 1 to 4 wt.% based on the zinc sulphide containing component, such as in an amount of from 1 to 3 wt.% based on the zinc sulphide containing component, such as in an amount of from 1 to 2 wt.% based on the zinc sulphide containing component. Solid cosmetic component

As discussed herein, the solid cosmetic product contains a solid cosmetic component. The solid cosmetic component may be any suitable cosmetic which may be formed into a solid. Examples include bath bombs, bath oils, bath melts, solid bubble bars, soaps, syndet bars, solid shower gels, massage bars, shower jellies, solid moisturisers, solid body scrubs.

The essential components of the solid cosmetic component are defined herein. However the composition may contain further additional components.

In a preferred aspect the solid cosmetic component further comprises a colouring. Preferably, the colouring is a water soluble colouring. The colouring can be naturally derived or it can be synthetic.

Preferably the solid cosmetic component comprises colouring in an amount of from 0.001 to 5 wt.% based on the solid cosmetic component, such as in an amount of from 0.001 to 4 wt.% based on the solid cosmetic component, such as in an amount of from 0.001 to 3 wt.% based on the solid cosmetic component, such as in an amount of from 0.001 to 2 wt.% based on the solid cosmetic component, such as in an amount of from 0.1 to 2 wt.% based on the solid cosmetic component, such as in an amount of from 1 to 2 wt.% based on the solid cosmetic component.

In a preferred aspect the solid cosmetic component further comprises a fragrance. Preferably the fragrance is selected from essential oils. Preferably the fragrance, and more preferably the essential oil, is present in the solid cosmetic component in an amount of from 0.001 to 10 wt.% based on the solid cosmetic component, such as in an amount of from 0.001 to 8 wt.% based on the solid cosmetic component, such as in an amount of from 0.001 to 5 wt.% based on the solid cosmetic component, such as in an amount of from 1 to 5 wt.% based on the solid cosmetic component, such as in an amount of from 2 to 4 wt.% based on the solid cosmetic component.

In one aspect the solid cosmetic component comprises a vegetable oil. Preferably, the vegetable oil is present in an amount of from 0.001 to 10 wt.% based on the solid cosmetic component, such as in an amount of from 0.1 to 10 wt.% based on the solid cosmetic component, such as in an amount of 0.1 to 5 wt.% based on the solid cosmetic component, such as in an amount of from 1 to 5 wt.% based on solid cosmetic component. Preferably the vegetable oil is selected from almond oil, jojoba oil, castor oil, olive oil, grape seed oil, argan oil and mixtures thereof.

Carbon dioxide effervescent component

In one aspect the solid cosmetic component is a carbon dioxide effervescent component comprising

(a) a salt of carbonic acid; and

(b) an acidifying agent.

In this aspect preferably the zinc containing component floats on water at 37°C.

Thus in further aspects, the present invention provides:

(1) a solid cosmetic product comprising

(i) a zinc sulphide containing component comprising

(a) a carrier material; and

(b) luminescent zinc sulphide; wherein the zinc sulphide containing component floats on water at 37°C;

(ii) a carbon dioxide effervescent component comprising

(a) a salt of carbonic acid; and

(b) an acidifying agent; wherein the carbon dioxide effervescent component and the zinc sulphide containing component are distinct from each other.

(2) a process for the production of a solid cosmetic product as defined in aspect (1) comprising the steps of: i) preparing the zinc sulphide containing component in one or more pieces and preparing the carbon dioxide effervescent component; ii) (a) enveloping the one or more pieces of zinc sulphide containing component with the carbon dioxide effervescent component; or

(b) applying the one or more pieces of zinc sulphide containing component to the outside of the carbon dioxide effervescent component.

(3) a product obtained or obtainable by a process as described in aspect (2).

(4) a cosmetic method comprising contacting the skin of a user with a solid cosmetic product as described in aspect (1) or aspect (3). It has been found that in these aspects once the solid cosmetic product of the present invention is added to water (such as bathing water) the carbon dioxide effervescent component will effervesce, as seen with the majority of commercially available bath bombs. As the zinc sulphide containing component either becomes exposed (when surrounded by the carbon dioxide effervescent component) or is present on the surface of the carbon dioxide effervescent component, the zinc sulphide containing component will be illuminated by light present in the bathing environment, such as a bathroom. This will cause the luminescent zinc sulphide in the zinc sulphide containing component to ‘glow’. This glow may be more apparent if the illuminating light is then reduced, for example by turning off a bathroom light. Thus, the user will be provided with components in the cosmetic product which ‘glow-in-the-dark’. This provides an enhanced user experience. This user experience can be enhanced further with thematic products such as Halloween products. Although some glow-in-the-dark products are known, the dual effect of the carbon dioxide effervescent component effervescing and the separate glowing component, produces a highly appealing visual display. Furthermore, the presence of additional components may simultaneously introduce remedial and therapeutic ingredients into a bath.

As the carbon dioxide effervescent component dissolves, the zinc sulphide containing component is ‘released’ to float freely in the bathing water. Consequently, the visual effects provided by the present invention continue after the complete dissolution of the carbon dioxide effervescent product. The floating zinc sulphide containing component remains on the bathing water surface for the duration of the bathing experience. After the bath the user may even retain the released zinc sulphide containing component and place them in future baths

The invention produces visual stimulation to the user that provides relaxation and therapeutic effects. This is in addition to any bathing effects.

The salt of carbonic acid and the acidifying agent are present in the carbon dioxide effervescent component in any suitable amounts to achieve effervescence. One skilled in the art is able to combine these materials to provide the desired rate of effervescence.

Preferably the salt of carbonic acid and the acidifying agent are present in a weight ratio of from 95:5 to 50:50, preferably in a weight ratio of from 90:10 to 50:50, preferably in a weight ratio of from 90:10 to 55:45, preferably in a weight ratio of from 90:10 to 60:40, preferably in a weight ratio of from 90:10 to 70:30. In one aspect the carbon dioxide effervescent component comprises a salt of carbonic acid selected from alkali metal carbonates, alkali metal bicarbonates and mixtures thereof.

Preferably, the salt of carbonic acid is selected from sodium bicarbonate, sodium carbonate and mixtures thereof.

In a preferred aspect the carbon dioxide effervescent component comprises the salt of carbonic acid, and preferably sodium bicarbonate, in an amount of from 40 to 95 wt.% based on the carbon dioxide effervescent component. In a preferred aspect the carbon dioxide effervescent component comprises the salt of carbonic acid, and preferably sodium bicarbonate, in an amount of from 45 to 95 wt.% based on the carbon dioxide effervescent component. In a preferred aspect the carbon dioxide effervescent component comprises the salt of carbonic acid, and preferably sodium bicarbonate, in an amount of from 50 to 95 wt.% based on the carbon dioxide effervescent component. In a preferred aspect the carbon dioxide effervescent component comprises the salt of carbonic acid, and preferably sodium bicarbonate, in an amount of from 50 to 90 wt.% based on the carbon dioxide effervescent component. In a preferred aspect the carbon dioxide effervescent component comprises the salt of carbonic acid, and preferably sodium bicarbonate, in an amount of from 55 to 90 wt.% based on the carbon dioxide effervescent component. In a preferred aspect the carbon dioxide effervescent component comprises the salt of carbonic acid, and preferably sodium bicarbonate, in an amount of from 60 to 85 wt.% based on the carbon dioxide effervescent component. In a preferred aspect the carbon dioxide effervescent component comprises the salt of carbonic acid, and preferably sodium bicarbonate, in an amount of from 60 to 80 wt.% based on the carbon dioxide effervescent component. In a preferred aspect the carbon dioxide effervescent component comprises the salt of carbonic acid, and preferably sodium bicarbonate, in an amount of from 60 to 75 wt.% based on the carbon dioxide effervescent component.

In one aspect the carbon dioxide effervescent component comprises an acidifying agent selected from monocarboxylic acids, dicarboxylic acids, tricarboxylic acids and mixtures thereof.

Preferably the acidifying agent is selected form citric acid, potassium bitartrate (cream of tartar) and mixtures thereof. In a preferred aspect the carbon dioxide effervescent component comprises the acidifying agent, and preferably citric acid, in an amount of from 5 to 60 wt.% based on the carbon dioxide effervescent component. In a preferred aspect the carbon dioxide effervescent component comprises the acidifying agent, and preferably citric acid, in an amount of from 5 to 55 wt.% based on the carbon dioxide effervescent component. In a preferred aspect the carbon dioxide effervescent component comprises the acidifying agent, and preferably citric acid, in an amount of from 5 to 50 wt.% based on the carbon dioxide effervescent component. In a preferred aspect the carbon dioxide effervescent component comprises the acidifying agent, and preferably citric acid, in an amount of from 5 to 45 wt.% based on the carbon dioxide effervescent component. In a preferred aspect the carbon dioxide effervescent component comprises the acidifying agent, and preferably citric acid, in an amount of from 5 to 40 wt.% based on the carbon dioxide effervescent component. In a preferred aspect the carbon dioxide effervescent component comprises the acidifying agent, and preferably citric acid, in an amount of from 5 to 35 wt.% based on the carbon dioxide effervescent component. In a preferred aspect the carbon dioxide effervescent component comprises the acidifying agent, and preferably citric acid, in an amount of from 5 to 30 wt.% based on the carbon dioxide effervescent component.

In a preferred aspect the carbon dioxide effervescent component comprises sodium bicarbonate in an amount of from 55 to 90 wt.% and citric acid in an amount of from 5 to 40 wt.% based on the carbon dioxide effervescent component.

Zinc sulphide containinq component & Solid cosmetic component

The zinc sulphide containing component and the solid cosmetic component may be present in suitable relevant amounts to provide the desired properties for the product. In one aspect, the zinc sulphide containing component is 2 to 50 wt.% and the solid cosmetic component is 50 to 98 wt%, based on the combined weight of the zinc sulphide containing component and the solid cosmetic component. In one aspect, the zinc sulphide containing component is 2 to 40 wt.% and the solid cosmetic component is 60 to 98 wt.% based on the combined weight of the zinc sulphide containing component and the solid cosmetic component. In one aspect, the zinc sulphide containing component is 2 to 30 wt.% and the solid cosmetic component is 70 to 98 wt.%, based on the combined weight of the zinc sulphide containing component and the solid cosmetic component. In one aspect, the zinc sulphide containing component is 2 to 25 wt.% and the solid cosmetic component is 85 to 98 wt.%, based on the combined weight of the zinc sulphide containing component and the solid cosmetic component. In one aspect, the zinc sulphide containing component is 2 to 20 wt.% and the solid cosmetic component is 80 to 98 wt.%, based on the combined weight of the zinc sulphide containing component and the solid cosmetic component. In one aspect, the zinc sulphide containing component is 2 to 15 wt.% and the solid cosmetic component is 85 to 98 wt.%, based on the combined weight of the zinc sulphide containing component and the solid cosmetic component.

In one aspect, the zinc sulphide containing component is 5 to 50 wt.% and the solid cosmetic component is 50 to 95 wt%, based on the combined weight of the zinc sulphide containing component and the solid cosmetic component. In one aspect, the zinc sulphide containing component is 5 to 40 wt.% and the solid cosmetic component is 60 to 95 wt.% based on the combined weight of the zinc sulphide containing component and the solid cosmetic component. In one aspect, the zinc sulphide containing component is 5 to 30 wt.% and the solid cosmetic component is 70 to 95 wt.%, based on the combined weight of the zinc sulphide containing component and the solid cosmetic component. In one aspect, the zinc sulphide containing component is 5 to 25 wt.% and the solid cosmetic component is 85 to 95 wt.%, based on the combined weight of the zinc sulphide containing component and the solid cosmetic component. In one aspect, the zinc sulphide containing component is 5 to 20 wt.% and the solid cosmetic component is 80 to 95 wt.%, based on the combined weight of the zinc sulphide containing component and the solid cosmetic component. In one aspect, the zinc sulphide containing component is 5 to 15 wt.% and the solid cosmetic component is 85 to 95 wt.%, based on the combined weight of the zinc sulphide containing component and the solid cosmetic component.

In one aspect, the zinc sulphide containing component is 10 to 50 wt.% and the solid cosmetic component is 50 to 90 wt%, based on the combined weight of the zinc sulphide containing component and the solid cosmetic component. In one aspect, the zinc sulphide containing component is 10 to 40 wt.% and the solid cosmetic component is 60 to 90 wt.% based on the combined weight of the zinc sulphide containing component and the solid cosmetic component. In one aspect, the zinc sulphide containing component is 10 to 30 wt.% and the solid cosmetic component is 70 to 90 wt.%, based on the combined weight of the zinc sulphide containing component and the solid cosmetic component. In one aspect, the zinc sulphide containing component is 10 to 25 wt.% and the solid cosmetic component is 85 to 90 wt.%, based on the combined weight of the zinc sulphide containing component and the solid cosmetic component. In one aspect, the zinc sulphide containing component is 10 to 20 wt.% and the solid cosmetic component is 80 to 90 wt.%, based on the combined weight of the zinc sulphide containing component and the solid cosmetic component. In one aspect, the zinc sulphide containing component is 10 to 15 wt.% and the solid cosmetic component is 85 to 90 wt.%, based on the combined weight of the zinc sulphide containing component and the solid cosmetic component.

In one aspect the zinc sulphide containing component is in one or more distinct pieces entirely enveloped by the carbon dioxide component. In one aspect the zinc sulphide containing component is in a single piece entirely enveloped by the solid cosmetic component.

In one aspect the zinc sulphide containing component is in one or more distinct pieces disposed on the outside of the solid cosmetic component. Preferably the zinc sulphide containing component is in multiple distinct pieces disposed on the outside of the solid cosmetic component.

The combined amount of the zinc sulphide containing component and the solid cosmetic component may be any amount to provide the desired physical characteristics of the solid cosmetic product. Preferably the combined amount of the zinc sulphide containing component and the solid cosmetic component is from about 10% to about 100% by weight of the total composition. Preferably the combined amount of the zinc sulphide containing component and the solid cosmetic component is from about 20% to about 100% by weight of the total composition. Preferably the combined amount of the zinc sulphide containing component and the solid cosmetic component is from about 30% to about 100% by weight of the total composition. Preferably the combined amount of the zinc sulphide containing component and the solid cosmetic component is from about 40% to about 100% by weight of the total composition. Preferably the combined amount of the zinc sulphide containing component and the solid cosmetic component is from about 50% to about 100% by weight of the total composition. Preferably the combined amount of the zinc sulphide containing component and the solid cosmetic component is from about 60% to about 100% by weight of the total composition. Preferably the combined amount of the zinc sulphide containing component and the solid cosmetic component is from about 70% to about 100% by weight of the total composition. Preferably the combined amount of the zinc sulphide containing component and the solid cosmetic component is from about 80% to about 100% by weight of the total composition. Preferably the combined amount of the zinc sulphide containing component and the solid cosmetic component is from about 85% to about 100% by weight of the total composition. Preferably the combined amount of the zinc sulphide containing component and the solid cosmetic component is from about 90% to about 100% by weight of the total composition. Preferably the combined amount of the zinc sulphide containing component and the solid cosmetic component is from about 95% to about 100% by weight of the total composition. Preferably the combined amount of the zinc sulphide containing component and the solid cosmetic component is 100% by weight of the total composition.

Additional Components

The solid product of the present invention may also comprise one or more cosmetically acceptable additives. The person skilled in the art is aware of a range of cosmetically acceptable additives which are suitable for incorporation into such compositions. For example, binders, fillers, opacifiers, perfumes, fragrances, decorative items and mixtures thereof.

It is particularly preferred that the composition of the present invention further comprises a fragrance. Preferably the fragrance is selected from essential oils.

In a preferred aspect the zinc sulphide containing component comprises a fragrance in an amount of 0.001 to 5 wt.% based on the zinc sulphide containing component, and the solid cosmetic component comprises a fragrance in an amount of 0.001 to 5 wt.% based on the solid cosmetic component.

Fruit and herb extracts and juices, vegetable oils and essential oils are all compatible with the composition. Colours, both naturally derived and synthetic can be used to colour the product.

In one embodiment, the cosmetically acceptable additives are selected from the group consisting of essential oils, vitamins, fragrances, colourings, clays, decorative articles and mixtures thereof.

The essential oils may be selected based on the fragrance desired, skin type to be treated and other effects desired based on the well-known properties of essential oils. The addition of essential oils, when taken in to the nose, are known to alter mood. For example, essential oils are known to create effects of drowsiness or stimulating the senses. Many well documented effects can be achieved by the use of essential oils. In one embodiment, the one or more essential oils present in the solid product are selected from Tarragon, Lemon myrtle, Jasmin, Ylang ylang, Labdunum, Lemongrass, Rose otto, Grapefruit, Patchouli, Rosemary, Armois, Lemon, Neroli, Sweet violet, Lavender, Orange 50 fold, Vanilla, Peppermint, Benzoin, Hydrangia, Litsea Cubeba, Cardamon, Tonka, and Chamomile blue. In one embodiment, the one or more essential oils present in the solid product are selected from Tarragon, Lemon myrtle, Labdunum, and Lemon.

Vitamins, particularly B, C and E are very beneficial for the skin. Vitamin rich ingredients such as Wheatgerm oil can also be used to deliver vitamins on to the skin. In a one embodiment, the vitamins are selected from vitamin B, vitamin C, vitamin E and mixtures thereof. It will be appreciated by one skilled in the art that the vitamin may be provided from any suitable source. For example the vitamin(s) may be provided from a synthetic source or from incorporation into the solid product of a material, such as a natural material, that has a high vitamin content.

The ingredients in the present invention do not require cosmetic preservatives. The use of cosmetic preservatives can increase the potential to irritate the skin.

The decorative items which may be present in the solid product include items such as glitter, paper such as rice paper, sequins, dried or fresh flowers, herbs, vegetables, parts thereof or mixtures thereof. Other enhancing materials may also be incorporated

Further preferred additive materials include vegetable oils, chocolate, herbs and spices, cosmetic colours (e.g. paprika, gardenia extract, D&C red no. 30), beans (e.g. aduki), fruit, fresh or dried (e.g. banana, avocado, mango, papaya, kiwi, raspberry, strawberry, blueberries, grapes, tomato, asparagus, or cucumber), honey, glycerin, cosmetic glitter, other vegetable butters (e.g. mango, avocado), clays (e.g. kaolin), starches (e.g. corn starch) and mixtures thereof.

The above ranges provide preferred amounts of each of the components. Each of these ranges may be taken alone or combined with one or more other component ranges to provide a preferred aspect of the invention. Process

As discussed herein, the invention provides a process for the production of a solid cosmetic product as described herein; the process comprising the steps of: i) preparing the zinc sulphide containing component in one or more pieces and preparing the solid cosmetic component; ii) (a) enveloping the one or more pieces of zinc sulphide containing component with the solid cosmetic component; or

Preferably the zinc sulphide containing component of step i) is caused to solidify in a predetermined shape. After solidification the solid cosmetic component of step i) is placed around the solid so as to envelop it as in step 1(a). The solid cosmetic component is also typically caused to solidify in a predetermined shape.

Preferably the solid cosmetic component of step i) is caused to solidify in a predetermined shape. After solidification the one or more pieces of zinc sulphide containing component of step i) are applied to the outside of the solidified carbon dioxide effervescent material as in step 1(b). The zinc sulphide containing component is then solidified to a predetermined shape.

The shape of the solid products of the present invention is not limited. It may be that the solid products are provided with a shape which would be aesthetically pleasing and/or which aids in the use of the product. For example, it may be that the solid product is produced in such a manner so that it solidifies in a shape which is ergonomically acceptable to the user. Therefore, in one embodiment of the process of the present invention, the mixture of step i) and/or step ii) is pressed into a mould, allowed to solidify, and then turned out to produce the solid product. Preferable shapes include spheres, cubes, cuboids and cones.

As described herein, the solid product may further comprise one or more cosmetically acceptable additives. In one embodiment, the process further comprises the step of combining with the mixture of step i) and/or step ii) one or more cosmetically acceptable additives as defined herein and/or the dispersant defined herein. The present invention also provides a product obtained or obtainable by a process as described herein.

Method

In one aspect of the present invention, there is provided a method comprising contacting the skin of a user with water in which the solid cosmetic product as defined herein has been placed in, or has dissolved in, or in which the solid cosmetic product as defined herein is dissolving. In a typical method, water is run in to the bath at an acceptable temperature. The user immerses their body in the water and the solid cosmetic composition is dropped into the water. The user then watches the effect of the product on the surface of the water. The user then bathes in the water.

Examples

The invention will now be described with reference to the following non-limiting examples.

Example 1 - Waxes

A number of waxes were evaluated for the preparation of a zinc sulphide containing component. They were prepared in accordance with the following base formula

The solid zinc sulphide containing component was prepared as follows:

1. Warm A to 75°C to melt

2. Cool A to 60°C, add powder and Fragrance-EC1 and stir in 3. Pour into moulds below 50°C, making sure the pigment is evenly suspended

4. Leave to set then turn out of moulds ready for use

The waxes evaluated and the findings observed are provided in Table 1.

Table 1

Example 2 - ZnS

A number of compositions containing varying amounts of zinc sulphide were evaluated for the preparation of a zinc sulphide containing component. They were prepared in accordance with the formulae below and using the method of Example 1. Each composition had a mass of 100g. As expected, the higher the amount of zinc sulphide present, the greener the composition looked and the brighter it glowed. Each was placed in water at 37°C and the following was observed.

2-1 1% Float - immediately 2-2 3% Float - immediately

2-3 5% Float - after a while

2-4 10% Float - after a while

2-5 20% Sink

2-6 30% Sink

Example 3 - Bathing product

A solid cosmetic product having the following composition was prepared.

The product was prepared as follows:

1. The carbon dioxide effervescent component was prepared as follows - Mix the sodium bicarbonate and citric acid together with some of the colour and some of the fragrance into a powdered mix.

2. The zinc sulphide containing component was prepared in accordance with Example 1.

The zinc sulphide containing component and carbon dioxide effervescent component were combined as follows

1. Once the zinc sulphide containing component in the mould is sufficiently cool and hard enough to handle, place the zinc sulphide containing component at the bottom of the mould.

2. Fill the remainder of the mould with the sodium bicarbonate and citric acid mix. 3. Leave until the composition has set.

4. Remove from the mould.

The prepared product was used as follows. A bath was partially filled with water at a temperature of 37 to 40°C. The user immersed themselves in the bath and then placed the product in the bath water. The product effervesced for a number of minutes and released the zinc sulphide containing components. The zinc sulphide containing components floated on the surface of the bath water without melting. Once the zinc sulphide containing components had been released onto the surface of the bath water, the user extinguished the artificial light in the bathroom. The zinc sulphide containing components emitted a pleasant glow which was reported to enhance the bathing experience.

Various modifications and variations of the present invention will be apparent to those skilled in the art without departing from the scope and spirit of the invention. Although the invention has been described in connection with specific preferred embodiments, it should be understood that the invention as claimed should not be unduly limited to such specific embodiments. Indeed, various modifications of the described modes for carrying out the invention which are obvious to those skilled in chemistry, biology or related fields are intended to be within the scope of the following claims.

Claims

1. A solid cosmetic product comprising

(i) a zinc sulphide containing component comprising

(a) a carrier material; and

(b) luminescent zinc sulphide;

2. A solid cosmetic product according to claim 1 wherein the zinc sulphide containing component is disposed on the outside of the solid cosmetic component.

3. A solid cosmetic product according to claim 1 or 2 wherein the zinc sulphide containing component is in multiple distinct pieces disposed on the outside of the solid cosmetic component.

4. A solid cosmetic product according to any one of the preceding claims wherein the zinc sulphide containing component containing component is 2 to 50 wt. % and the solid cosmetic component is 50 to 98 wt%, based on the combined weight of the zinc sulphide containing component and the solid cosmetic component.

5. A solid cosmetic product according to any one of the preceding claims wherein the zinc sulphide containing component is 5 to 25 wt. % and the solid cosmetic component is 75 to 95 wt%, based on the combined weight of the zinc sulphide containing component and the solid cosmetic component.

6. A solid cosmetic product according to any one of the preceding claims wherein the carrier material is selected from waxes, paper, wood, bark, sponge, plastics, soaps, synthetic detergents, vegetable butters, clays and mixtures thereof.

7. A solid cosmetic product according to any one of the preceding claims wherein the carrier material is selected from waxes and mixtures thereof.

8. A solid cosmetic product according to any one of the preceding claims wherein the carrier material is at least soy wax.

9. A solid cosmetic product according to any one of the preceding claims wherein the carrier material has a melting point of at least 45°C.

10. A solid cosmetic product according to any one of the preceding claims wherein the carrier material has a melting point of at least 55°C.

11. A solid cosmetic product according to any one of the preceding claims wherein the zinc containing component floats on water at 37°C;

12. A solid cosmetic product according to any one of the preceding claims wherein the carrier has a density of less than 0.993g/cm³ at 37°C.

13. A solid cosmetic product according to any one of the preceding claims wherein the luminescent zinc sulphide is copper doped zinc sulphide.

14. A solid cosmetic product according to any one of the preceding claims wherein the zinc sulphide containing component contains luminescent zinc sulphide in an amount of 0.1 to 20 wt. % and carrier material in an amount of 80 to 99.9 wt. % based on the zinc sulphide containing component.

15. A solid cosmetic product according to any one of the preceding claims wherein the zinc sulphide containing component contains luminescent zinc sulphide in an amount of 1 to 10 wt. % and carrier material in an amount of 90 to 99 wt. % based on the zinc sulphide containing component.

16. A solid cosmetic product according to any one of the preceding claims wherein the zinc sulphide containing component has a density of less than 0.993g/cm³ at 37°C.

17. A solid cosmetic product according to any one of the preceding claims wherein the solid cosmetic component is a carbon dioxide effervescent component comprising (a) a salt of carbonic acid; and (b) an acidifying agent.

18. A solid cosmetic product according to claim 17 wherein the salt of carbonic acid and the acidifying agent are present in a weight ratio of from 90:10 to 50:50.

19. A solid cosmetic product according to claim 17 or 18 wherein the salt of carbonic acid and the acidifying agent are present in a weight ratio of from 90:10 to 70:30.

20. A solid cosmetic product according to any one of claims 17 to 19 wherein the salt of carbonic acid is selected from alkali metal carbonates, alkali metal bicarbonates and mixtures thereof.

21. A solid cosmetic product according to any one of claims 17 to 20 wherein the salt of carbonic acid is selected from sodium bicarbonate, sodium carbonate and mixtures thereof.

22. A solid cosmetic product according to any one of claims 17 to 21 wherein the acidifying agent is selected from monocarboxylic acids, dicarboxylic acids, tricarboxylic acids and mixtures thereof.

23. A solid cosmetic product according to any one of claims 17 to 22 wherein the acidifying agent is selected citric acid, potassium bitartrate (cream of tartar) and mixtures thereof.

24. A solid cosmetic product according to any one of claims 17 to 23 wherein the carbon dioxide effervescent component comprises

(a) sodium bicarbonate in an amount of from 55 to 90 wt% based on the carbon dioxide effervescent component; and

(b) citric acid in an amount of from 5 to 40 wt% based on the carbon dioxide effervescent component.

25. A solid cosmetic product according to any one of the preceding claims wherein the solid cosmetic component further comprises a colouring.

26. A solid cosmetic product according to claim 25 wherein the solid cosmetic component comprises a water soluble colouring.

27. A solid cosmetic product according to claim 25 or 26 wherein the solid cosmetic component comprises colouring in an amount of from 0.001 to 5 wt% based on the solid cosmetic component.

28. A solid cosmetic product according to any one of the preceding claims wherein the zinc sulphide containing component or the solid cosmetic component further comprises at least one additional component selected from binders, fillers, opacifiers, perfumes, fragrances, decorative items and mixtures thereof.

29. A solid cosmetic product according to any one of the preceding claims wherein the product is a bathing product.

30. A process for the production of a solid cosmetic product as defined in claims 1 to 29 comprising the steps of: i) preparing the zinc sulphide containing component in one or more pieces and preparing the solid cosmetic component; ii) (a) enveloping the one or more pieces of zinc sulphide containing component with the solid cosmetic component; or

31. A process according to claim 30 wherein step (b) comprises applying the one or more pieces of zinc sulphide containing component to the outside of the solid cosmetic component.

32. A product obtained or obtainable by the process of claim 30 or 31.