Invented by Gerald John Guskey, Denis Alfred Gonzales, Karl Shiqing Wei, Procter and Gamble Co

The market for skin cleansing compositions containing biodegradable particles is growing rapidly. Consumers are becoming more aware of the impact of their personal care products on the environment and are seeking out products that are eco-friendly and sustainable. Biodegradable particles are a great solution to this problem, as they break down naturally in the environment and do not contribute to pollution. Skin cleansing compositions containing biodegradable particles are made from natural materials such as rice bran, oatmeal, and sugar. These particles are gentle on the skin and provide a gentle exfoliation, removing dead skin cells and impurities. They are also effective at removing makeup and other impurities from the skin, leaving it clean and refreshed. One of the main benefits of using skin cleansing compositions containing biodegradable particles is that they are environmentally friendly. Traditional exfoliating products contain plastic microbeads, which are not biodegradable and can cause harm to marine life. Biodegradable particles, on the other hand, break down naturally in the environment and do not contribute to pollution. Another benefit of using skin cleansing compositions containing biodegradable particles is that they are gentle on the skin. Traditional exfoliating products can be harsh and abrasive, causing irritation and redness. Biodegradable particles are gentle on the skin and provide a gentle exfoliation, leaving the skin feeling soft and smooth. The market for skin cleansing compositions containing biodegradable particles is expected to continue to grow in the coming years. Consumers are becoming more aware of the impact of their personal care products on the environment and are seeking out products that are eco-friendly and sustainable. Biodegradable particles are a great solution to this problem, as they provide a gentle and effective way to exfoliate the skin without causing harm to the environment. In conclusion, the market for skin cleansing compositions containing biodegradable particles is growing rapidly. Consumers are becoming more aware of the impact of their personal care products on the environment and are seeking out products that are eco-friendly and sustainable. Biodegradable particles are a great solution to this problem, as they provide a gentle and effective way to exfoliate the skin without causing harm to the environment. As the demand for eco-friendly personal care products continues to grow, we can expect to see more and more skin cleansing compositions containing biodegradable particles on the market.

The Procter and Gamble Co invention works as follows

The invention is a skin cleaning composition with biodegradable particles. The abrasive particle has a Circularity ranging from 0.10 to 0.60, a diameter based on area equivalent of 500 m to 2,000 m and Biodegradable rate of 30% to 100%. The composition contains a surfactant or structured phase with a yield stress of between 1 Pa and 100 Pa or between 0.1 Pa and 10 Pa.

Background for Skin cleansing compositions containing biodegradable particles

Skin cleansing compositions include abrasive particle for various reasons, such as cleaning the skin (e.g. removal of dirt, oil, or sebum) or improving its appearance (e.g. exfoliation). Abrasive polymers are often made of petroleum-based synthetic materials like polystyrene, cross-linked polystyrene(XST), polyurethane(PU), polyolefins or waxes. These petroleum-based synthetic materials may cause long-term disposal issues and have negative effects on the environment.

The current market demand for greener alternatives has led to the introduction of biobased abrasive particle in home and fabric care products that are used for cleaning clothes, dishes and hard surfaces. Biodegradable abrasive particle products are generally not suitable for skin. They are intended for specific fields of use, such as cleaning hard surfaces or detergents for dishes and clothes. These abrasive particle may be too abrasive, and damage skin.

The use of less aggressive biodegradable particles can, however, result in a poor or inadequate cleansing effect, as shown by the soil or makeup that remains on the skin. In personal cleansing products, it is important to use abrasive powders that are large enough for the consumer to see and feel them without having a gritty surface. Biodegradable particles may, however, have an unwelcome gritty texture or feel too coarse. “Formulators often have to choose between larger visible abrasive particle that can cause skin damage and softer abrasive particle that is more sensorial but has a lower cleansing effectiveness and cannot be seen.

The use of biobased abrasive polymers in skin cleaning compositions has been explored minimally for optimal abrasive properties, stability, and compatibility with the other components. Skin cleansing compositions may be designed to stabilize and suspend dispersions of beneficial agents and other materials while maintaining the physical integrity of personal care compositions.

Structured surfactants can be a good way to add structure. These surfactants are used to provide stability, lathering, cleaning, mildness, and other functions that are typically associated with a surfactant. Surfactant must provide structure in a cleansing formulation at full strength, and upon dilution, the composition must quickly transition into free surfactant microparticles that lather and clean while depositing benefit agents. Compositions with a high concentration of structured surfactant or those that are diluted to increase structure will have a reduced mildness. Over-structured compositions will result in poor lathering. Instability can be caused by not having enough structurant. It can also be difficult to achieve a balance between the two properties when there are larger, shaped particles.

Therefore there is a requirement for a skin cleansing composition. Body wash composition comprising shaped, biodegradable particles that have skin cleansing or exfoliating properties when applied to skin surfaces, and which has a surface safety profile acceptable for skin. The skin cleansing composition should also be biodegradable. Preferably, this is in addition to the biodegradable abrasive particle. Skin cleansing compositions containing shaped abrasive particle and low levels of structuring agents provide compositions with a proper structure at full strength, and a micellar structure after dilution. These compositions also have mildness and the particles are stable, visible and have tactile properties. This composition is not recognized by the art.

In one embodiment, a skin cleaning composition is provided that comprises:

The composition can also include a carrier that is dermatologically acceptable.

The present invention also relates to another aspect of a method to cleanse the human skin. This involves contacting topically the skin with a skin cleaning composition according to the invention and then rinsing the skin. The compositions of the present invention have the advantage that they can be used for cleaning skin surfaces while maintaining a high level of surface safety. The present invention also has the advantage that the abrasive particle levels can be kept low, and still provide the benefits above.

The present invention also relates to the use of biodegradable particles in a skin cleaning composition for a selected benefit from the group consisting mild skin exfoliation and dirt removal from a surface of skin, or combinations thereof.

The articles ‘a?, ‘an? and ‘the? are used unless otherwise stated. “One or more” is a synonym for “one”. The term “comprising” means ‘one or more. The term ‘comprising’ bedeutet, that additional steps or ingredients can be added to the final result without affecting it. This term also encompasses ‘consisting essentially of? and?consisting essentially of?. The terms ‘consisting of’ and ‘consisting essentially? The inventions, methods, and processes described in this document can include, consist of, or consist essentially of any of the elements, limitations, or additional ingredients, components or steps described. The compositions of the invention include biodegradable particles and additional or optional ingredients, as described below.

All percentages, parts, and ratios are based on the total weight, unless otherwise stated. The weights of the listed ingredients are calculated based on their active levels and do not include any carriers or byproducts which may be present in commercially available materials. Below, we describe in detail the components, including optional additions, as well methods of preparation and methods of use.

As used herein ?biodegradable? “Biodegradable” means the chemical dissolution of organic material by bacteria, or other biological means. This is determined according to the Biodegradability test described in this section.

As used herein ?Biodegradable Test? The test described in Method Section, where the test material is suspended within a phosphate-buffered media with an activated sludge containing inoculum. Carbon dioxide formation measured by an electrolytic respirometer. The test material contains the only carbon and energy and, under aerobic conditions, microorganisms will metabolize organic materials to produce CO2.

As used herein ?derivatives? “As used herein, derivatives” means an ester or ether, an amide, an hydroxyl and/or a salt structural analogue.

As used in this document, “dermatologically accepted” means that the compositions or components described are suitable for use in contact with human skin tissue, preferably facial skin surfaces. “As used herein,?dermatologically acceptable? means that the components or compositions described are suitable for contact with human tissue, preferably the facial skin surface, without excessive toxicity, incompatibility instabilities, allergic reactions, discomfort and the like.

As used herein ?exfoliation? “As used here,?exfoliation? “Mild skin exfoliation” means removing dead skin cells without damaging the skin or causing discomfort.

As used herein ?surface safety profile? “As used herein,?surface safety profile? means that the compositions are not too abrasive on human skin tissue. This includes facial skin tissue.

The term “anhydrous” is used herein, unless otherwise specified. It refers to those compositions or materials that contain less than about 10% by weight of water. As used in this document, unless otherwise stated, the term “anhydrous” refers to compositions or materials that contain less than 10% by weight, more preferable less than 5%, still more preferable less than 3% and even more preferred zero percent.

The term “multiphase” as used herein means that compositions consist of at least two phases which are chemically distinct (e.g. “The term?multiphase? A surfactant phase, and a benefit-phase. These phases are in physical contact and not separated by any barrier. In one aspect, the composition may be a multiphase formulation where the phases are blended or combined to a significant extent. In another aspect, the composition may be a multiphase one where the phases are separated but distinct spaces within the package they are stored in, but they remain in direct contact.

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