US20130048005A1

US20130048005A1 - Skin Care Regimen Comprising At Least One Composition Comprising A Pyrithione Source

Info

Publication number: US20130048005A1
Application number: US13/589,428
Authority: US
Inventors: Edward Dewey Smith, III; Jason Edward Cook; Brian Joseph Limberg; Chanchal Kumar Ghosh
Original assignee: Gillette Co LLC
Current assignee: Gillette Co LLC
Priority date: 2011-08-22
Filing date: 2012-08-20
Publication date: 2013-02-28

Abstract

A method of treating skin comprising: applying a first composition to a portion of skin to form a prepared surface; and contacting said prepared surface with a hair removal device to form a contacted surface, wherein said hair removal device comprises at least one of: a skin engaging member, a molded shaving aid, and a combination thereof; applying a second composition to said contacted surface to form a treated surface, wherein at least one of said first composition, said hair removal device, said second composition, or a combination thereof comprises a pyrithione source, such as zinc pyrithione.

Description

CROSS REFERENCE TO RELATED APPLICATION

This application claims priority to U.S. Provisional Application No. 61/526,025 filed Aug. 22, 2011, the subject of which is hereby incorporated by reference in its entirety.

BACKGROUND OF THE INVENTION

Manufacturers of skin care compositions have made many attempts to incorporate various ingredients into their products to provide benefits such as anti-aging; skin health; anti-inflammation. The ingredients mentioned for these types of purposes are many and the disclosures of such use are prolific. See e.g. U.S. Patent Publ. Nos. 2010/0055138; 2009/123576; 2008/0069784; 2008/0199533; 2008/0003188; 2007/0274932; 2006/0257386; 2006/0165643; 2005/0019356; 2002/0022040; 2002/0197228; 2007/0224154; and WO Pub No. 2011/085053.
Despite these many different types of skin care compositions, there remains a desire to find a regimen of products and uses which can help improve or protect skin when used in combination with a hair removal device.

SUMMARY OF THE INVENTION

One aspect of the present invention provides for a method of treating skin comprising: applying a first composition to a portion of skin to form a prepared surface; contacting said prepared surface with a hair removal device to form a contacted surface, wherein said hair removal device comprises at least one skin engaging member, at least one molded shaving aid, and a combination thereof; applying a second composition to said contacted surface to form a treated surface, wherein at least one of said first composition, said at least one skin engaging member, said at least one molded shaving aid, and said second composition comprises a pyrithione source, such as zinc pyrithione.

DESCRIPTION OF DRAWINGS

FIG. 1A is a perspective view of a razor cartridge which includes a skin engaging member of the present invention. FIG. 1B is a sectional view taken along line 1B-1B of FIG. 1. FIG. 1C is a side elevation view of second type of skin engaging member of the present invention.

FIG. 2A is a perspective view of the head and neck portion of a razor according to one embodiment of the invention. FIG. 2B is a perspective view of the head and neck portion shown in FIG. 1, viewed from the back.

FIG. 3 is an exploded perspective view of the razor of FIG. 2A. Like reference symbols in the various drawings indicate like elements.

DETAILED DESCRIPTION OF THE INVENTION

1. Regimen

The present invention relates to a method of treating skin comprising various steps but where at least one of said steps involves contact skin with a composition comprising a pyrithione source, such as zinc pyrithione.
In one embodiment, the invention relates to a method of treating skin comprising: applying a first composition to a portion of skin to form a prepared surface; contacting said prepared surface with a hair removal device to form a contacted surface, wherein said hair removal device comprises at least one skin engaging member, at least one molded shaving aid, and a combination thereof; applying a second composition to said contacted surface to form a treated surface, wherein at least one of said first composition, said at least one skin engaging member, said at least one molded shaving aid, and said second composition comprises a pyrithione source. In one embodiment, the pyrithione source is selected from a group consisting of zinc pyrithione, sodium pyrithione, pyrithione acid, dipyrithione, chitonsan pyrithione, magnesium disulfide pyrithione, and combinations thereof. The pyrithione source can be at varying levels, such as at a level of from about 0.01% to about 5%, by weight of said composition wherein it is present (for example if the pyrithione source is present in the first or second composition, or where it is present in a shaving aid).
In one embodiment, said pyrithione source comprises a platelet zinc pyrithione (platelet ZPT), wherein the platelet ZPT comprises a mean particle diameter of about 0.5 microns to about 10 microns, a median particle diameter of about 0.5 microns to about 10 microns, and a thickness of about 0.6 microns to about 15 microns. The mean particle diameter of the platelet ZPT can be about 1 micron to about 5 microns. The median particle diameter of the platelet ZPT can be about 0.6 microns to about 0.7 microns.
In one embodiment, more than one of said first composition, said at least one skin engaging member, said at least one molded shaving aid, and said second composition comprises a pyrithione source. For example, the pyrithione source can provide different benefits depending where it is present. Without intending to be bound by theory, it is believed that if it is present in the first composition, which can be a pre-shaving preparation such as a post foaming shave gel or foam, or a pre-shave oil or other pre-treatment composition (which can be used even before the shave preparation / first composition), the pyrithione source can provide anti-irritation benefits. If it is present as part of the hair removal device or razor, the pyrithione source can provide anti-irritation and/or anti-bacterial benefits. When it is present in the second composition, it is believed that the pyrithione source can provide anti-bacterial benefits which may last after the hair removal process. This can be particularly useful for underarm or private area hair removal. In one embodiment, pyrithione is present in one or more molded shaving aids present on the cartridge and the second composition.
In one embodiment, the user can be instructed to rinse following the hair removal step and prior to the step of applying the second composition. The second composition can also be a rinse off composition such as a facial wash or in shower moisturizer but can be a leave on, such as a lotion or moisturizer.

2. Pyrithione Source

As used herein, the pyrithione source can be a pyrithione and a pyrithione salt capable of providing antimicrobial efficacy and/ or anti-irritation on skin when the pyrithione source is used in a shave preparation composition. Preferred pyrithione salts are those formed from heavy metals such as zinc, tin, cadmium, magnesium, aluminum and zirconium. Zinc salts are most preferred, especially the zinc salt of 1-hydroxy-2-pyridinethione (zinc pyridinethione, also named zinc pyrithione, ZPT). Other cations such as sodium may also be suitable. The pyrithione source may be selected from the group consisting of sodium pyrithione, zinc pyrithione, magnesium disulfide pyrithione, pyrithione acid, dipyrithione, chitosan pyrithione and combinations thereof. Preferably, it is sodium pyrithione or zinc pyrithione and more preferably, it is a zinc pyrithione (ZPT). ZPT is commercially available from various suppliers. For example, ZPT FPS available from Arch Chemical can be used. It is an aqueous dispersion comprising 48% active ZPT. Pyrithione sources are well known in the personal cleansing art, and are described, for example, in U.S. Pat. No. 2,809,971; U.S. Pat. No. 3,236,733; U.S. Pat. No. 3,753,196; U.S. Pat. No. 3,761,418; U.S. Pat. No. 4,345,080; U.S. Pat. No. 4,323,683; U.S. Pat. No. 4,379,753; and U.S. Pat. No. 4,470,982. Descriptions about pyrithione sources in the above mentioned patents are incorporated herein by reference. The pyrithione source can be present in the present composition in an amount ranging from about 0.05%, 0.1% or 0.4% to about 0.5%, 2% or 5%.

3. Zinc Source

The present composition may additionally comprise a zinc source. Suitable zinc source include those zinc-containing materials described in U.S. Pat. No. 4,161,526, which can also provide discoloration inhibiting benefit. Specifically, the zinc source is selected from a group consisting of a zinc salt of an organic carboxylic zinc salt, inorganic zinc salt, zinc hydroxide, zinc oxide, and combinations thereof. In one embodiment, the zinc source is zinc carbonate and/or zinc oxide. The zinc source, for example, zinc carbonate is also known as being able to potentiate the efficacy of the pyrithione source. The present composition comprises from 0.01% to 0.5% of a zinc source. In one embodiment of the present invention, the present soap base comprises 0.5% zinc pyrithione, 2% sodium carbonate, and 0.1% zinc carbonate.

4. Zinc Pyrithione

According to an example embodiment, the composition can further comprise a pyrithione or a polyvalent metal salt of pyrithione such as a zinc salt of 1-hydroxy-2-pyridinethione (known as “zinc pyrithione” or “ZPT”).
In a preferred embodiment, the zinc pyrithione included in soap base is dry powder zinc pyrithione in platelet particle form (“platelet ZPT”). According to example embodiments, the platelet ZPT included in the soap base composition can include particles with, for example, a median particle diameter of about 0.5 microns to about 10, alternatively about 1 to about 5 microns, and alternatively about 3 microns and a mean particle diameter of about 0.5 to about 10 microns, alternatively about 1 to about 5 microns, alternatively about 2 to about 4 microns, and alternatively about 3 microns. The platelet ZPT can also have a thickness of about 0.6 to about 15 microns, alternatively about 0.6 to about 1 micron, alternatively about 0.6 microns to about 0.8 microns, and alternatively about 0.6 microns to about 0.7 microns as shown in FIG. 1. The platelet ZPT included in the antimicrobial bar composition can also have a span of less than about 5, and alternatively about 1.
The antimicrobial bar composition can include from about 0.01% to about 5%, by weight of the bar composition, of platelet ZPT, alternatively from about 0.1% to about 2%, and alternatively from about 0.1% to about 1%.
According to an example embodiment, the platelet ZPT can be included in the antimicrobial bar compositions disclosed herein as a dry power that is, for example, dispersed with the soap. Alternatively, the platelet ZPT can be included in the antimicrobial bar compositions disclosed herein as aqueous dispersion with, for example, the soap.
The platelet ZPT included in the antimicrobial bar composition can be stabilized against, for example, flocculation. In one embodiment, each of the platelet ZPTs used in the antimicrobial bar composition can have a coating or layer thereon to prevent the platelet ZPTs from attaching to each other. The coating or layer can be polynaphthalene sulfonate or any other suitable sulfate, sulfonate, carboxylate, or other compound that provides stability for example by charge or steric barrier.
In example embodiments, the ZPT can be made by reacting 1-hydroxy-2-pyridinethione (i.e., pyrithione acid) or a soluble salt thereof with a zinc salt (e.g. zinc sulfate) to form a zinc pyrithione precipitate as illustrated in U.S. Pat. No. 2,809,971 and the zinc pyrithione can be formed or processed into platelet ZPT using, for example, sonic energy as illustrated in U.S. Pat. No. 6,682,724.
It has been discovered that the use of platelet ZPT in an soap base such as the antimicrobial bar composition disclosed herein provides improvements in the efficiency of the amount of ZPT deposited on the surface upon which the antimicrobial bar composition is being used on as well as reductions in the amount of antimicrobials that form after use. More specifically, it has been discovered that the use of platelet ZPT having a median particle diameter of about 1 micron to about 5 microns, a mean particle diameter of about 1 microns to about 5 microns, and a thickness of about 0.6 microns to about 15 microns in an antimicrobial bar composition such as the antimicrobial bar composition disclosed herein provides improvements in the efficiency of the amount of ZPT deposited on the surface upon which the antimicrobial bar composition is being used on as well as reductions in the amount of antimicrobials that form after use in comparison with, for example, particulate ZPT such as the particulate ZPT shown in FIG. 2. FIG. 3 illustrates these improvements by comparing an antimicrobial bar composition that includes particulate ZPT having a median particle diameter of about 0.70 microns, a mean particle diameter of about 0.75 microns, and a thickness of less than 0.6 microns with an antimicrobial bar composition that includes platelet ZPT described above. As shown in FIG. 1, the use of platelet ZPT reduces the number of colony forming units (CFUs) that form on a substrate in comparison with particulate ZPT. As such, the use of platelet ZPT increases the residual efficacy of the antimicrobial bar composition and provides protection on the surface the antimicrobial bar composition is used on from subsequent invasions of microbials.

5. Additional Antibacterial Agents

The composition containing the pyrithione source can optionally further include one or more additional antibacterial agents that can serve to further enhance the antimicrobial effectiveness of the bar compositions. When present, the antimicrobial bar composition can include from about 0.001% to about 2%, preferably from about 0.01% to about 1.5%, more preferably from about 0.1% to about 1%, by weight of the antimicrobial bar composition. Examples of antibacterial agents that can be employed are the carbanilides, for example, triclocarban (also known as trichlorocarbanilide), triclosan, a halogenated diphenylether available as DP-300 from Ciba-Geigy, hexachlorophene, 3,4,5-tribromosalicylanilide, and salts of 2-pyridinethiol-1-oxide, salicylic acid and other organic acids. Other suitable antibacterial agents are described in detail in U.S. Pat. No. 6,488,943 (referred to as antimicrobial actives).

6. First Composition

The first composition can be many different types of compositions which can be used in a pre-hair removal context. Non-limiting examples include shave foams, post foaming shave gels, non-aerosol shave gels, personal cleansers, shave oils, and even liquid or bar soaps. Non-limiting examples of first compositions comprising a pyrithione source is available in:
U.S. application Ser. No. 13/587,227 to Alwattari et. al, filed Aug. 16, 2012, P&G Docket No. Z-8612 (personal care composition which is in the form of an aerosol product, preferably a post foaming gel or a shaving foam, said composition comprising: from about 2% to about 25% of a water dispersible surface active agent; from about 40% to about 95% of a carrier comprising water; from about 1% to about 6% of a volatile post-foaming agent; and from about 0.01 to about 15% of a hydrophobic agent, wherein said hydrophobic agent forms at least one microdroplet having a particle size from about 0.15 microns to about 10 microns, from about 0.01% to 5% of an anti-irritation agent comprising a zinc pyrithione, a zinc salt, or a combination thereof, such as zinc pyrithione);
U.S. application Ser. No. 13/587,217 to Schwartz et. al, filed Aug. 16, 2012, P&G Docket No. Z-8611 (a shave preparation comprising: at least 60% water; from about 2% to about 4% of one or more lipophilic skin conditioning agents; from about 0.25% to about 3% of one or more thickening agents; from about 0.25% to about 3% of one or more emulsifying agents; and from about 0.25% to about 3% of one or more lubricants; from about 0.25% to about 2.5% of an anti-irritation agent wherein said anti-irritation agent comprises zinc pyrithione, and wherein the shave preparation is substantially free of a gel network);
U.S. Patent Publ. No. 2011/0200650 (a personal care composition suitable for use as a non-aerosol shave composition comprising: from about 0.01% to 5% of an anti-irritation agent; from about 5% to about 30% of a lathering surfactant; from about 50% to about 90% of a carrier comprising water; and optional adjunct ingredients such as lubricants);
U.S. Patent Publ. No. 2011/0201588 (personal care composition which is in the form of an aerosol product, preferably a post foaming gel or a shaving foam, said composition comprising: from about 0.01% to 5% of an anti-irritation agent; from about 2% to about 25% of a water dispersible surface active agent; from about 60% to about 93% of a carrier comprising water; and a lubricant); and
U.S. application Ser. No. 13/036,889 to Limberg et al, first filed Feb 28, 2011, P&G Docket No. 12005 (such as an antimicrobial bar composition comprising: (a) from about 0.1% to about 35%, by weight of the antimicrobial bar composition, of water; (b) from about 45% to about 99%, by weight of the antimicrobial bar composition, of soap; and (c) from about 0.01% to about 5%, by weight of the antimicrobial bar composition, of platelet zinc pyrithione (ZPT), wherein the platelet ZPT comprises a median particle diameter of about 0.5 microns to about 5 microns, a mean particle diameter of about 1 microns to about 4 microns, and a thickness of about 0.6 micros to about 15 microns.
Those of skill in the art will understand that other personal care compositions can be used as the first composition.

7. Second Composition

The second composition can be many different types of compositions which can be used in a post-hair removal context. Non-limiting examples include post shave gels or moisturizers, after shaves, skin balms, liquid or bar soaps, facial and personal cleansers and so forth. Non-limiting examples of a second composition comprising a pyrithione source is available in U.S. application Ser. No. 13/587,206 to Coffindaffer et al, filed Aug. 16, 2012, P&G Docket No. Z-8610 (a personal care composition which is suitable for various uses including but not limited to facial or body moisturizers and lotions, and so forth, said personal care composition comprising: from 0.01% to 5% of an anti-irritation agent comprising a zinc pyrithione, a zinc salt, or a combination thereof; and from about 50% to about 99.99% of a carrier), and U.S. application Ser. No. 13/036,889 to Limberg et al, first filed Feb. 28, 2011 (disclosed above).

8. Hair Removal Device Details

Various types of hair removal devices can be used along with the regimen of the present invention. In one embodiment, the hair removal device is a shaving razor having two or more blades. The shaving razor can have a skin engaging member comprising a shaving aid such as a lubrication strip, and/or one or more molded shaving aids, such as the Venus Breeze® line of razors and the Schick® Intuition® line of razors. See also US Patent Publ Nos. 2005/0011073A, 2006/225285A and 2006/080837A, and U.S. Pat. No. 7,811,553. The shaving razor can also be a composition dispensing device.
a. Razor Cartridge Skin Engaging Members
FIGS. 1A-1C show embodiments where the skin engaging member comprises a pyrithione source. Referring to FIGS. 1A and 1B, the razor cartridge 114 includes housing 116, which carries three blades 118, a finned elastomeric guard 120, and a skin engaging member 122 located on a skin-engaging portion (in this case the cap) of the cartridge. Skin engaging member 122 is shown having two layers, but a single composition can also be used. The skin engaging member is preferably locked in (via adhesive, a fitment, or melt bonding) an opening or on a plate or other flat surface in the rear of the cartridge. Skin engaging member 132, shown in FIG. 1C, is similar to skin engaging member 122, except that skin engaging member 132 has a homogeneous composition throughout and a uniform, slightly curved to flat upper surface. An example of a skin engaging member comprising a pyrithione source is available in U.S. application Ser. No. 13/586,427 to Bradford et al, filed Aug. 15, 2012, P&G Docket No. Z-8609 (a skin engaging member, suitable for use with a hair removal device, such as a razor or depilatory and scraping tool, said skin engaging member comprising a matrix comprises at least one of: a water soluble polymer, an emollient, and a mixture thereof; at least one anti-irritation agent comprising zinc pyrithione which can be in a platelet form), and U.S. application Ser. No. 13/ 529867 to Smith et al, filed Jun. 21, 2012, P&G Docket No. Z-8608 (a razor cartridge is provided comprising a housing having a base which is connectable to a handle, two or more blades, whose tips are aligned in a cutting plane to cut in a cutting direction, and a moisturizing block disposed before and/or after the blades in the cutting direction, the moisturizing block having a skin-contacting surface, wherein: the moisturizing block comprises at least 50% lipophilic materials by weight of the moisturizing block from about 0.01% to 5% of an anti-irritation agent comprising a zinc pyrithione, a zinc salt, or a combination thereof).
FIGS. 2 a-3 show embodiments comprising a razor including a Molded Shaving Aid Composition comprising a pyrithione source. This razor can also include a skin engaging member such as a shaving aid as also shown in FIGS. 1A-1C. The skin engaging member can be present forward or aft of the blades, and they can be intermediate the forward blade and closest molded shaving aid or the aft-most blade and its closest molded shaving aid. An example of a skin engaging member comprising a pyrithione source is available in U.S. application Ser. No. 13/406,913 to Smith et al, filed Feb. 28, 2012, P&G Docket No. Z-8607M.
The molded shaving aid compositions are in certain embodiments incorporated into a razor, e.g., into a razor cartridge. For example, the molded shaving aid composition can be attached to one or more holders, which are themselves configured to be attachable to a razor head. Referring to FIGS. 2A, 2B, and 3, a shaving razor 10 includes a disposable cartridge 12 and a handle 14. As shown in FIG. 3, cartridge 12 includes a connecting member 18, which removably connects cartridge 12 to a connecting portion 19 of handle 14, a blade unit 16, which is pivotally connected to connecting member 18, and a shaving aid holder 30 mounted on the blade unit 16. Referring to FIG. 2A, the blade unit 16 includes a plastic housing 20, a guard 22 at the front of housing 20, and blades 28 between guard 22 and the rear of housing 20.
The blade unit 16 can be similar to blade units described in U.S. Pat. No. 5,661,907. The handle 14 can be similar to those described in U.S. Pat. Nos. 5,855,071, 5,956,851 and/or 6,052,903. The connecting member 18 that is used to connect blade unit 16 to handle 14 can be similar to connecting members described in U.S. Patent Publ. No. 2006/0080837A1.
As will be discussed in further detail below, the holder 30 carries a pair of shaving aid portions 31A, 31B. The front shaving aid portion 31A contacts the skin in front of the blades, i.e., before shaving, and the rear shaving aid portion 31B contacts the skin behind the blades. One or both of the shaving aid portions are formed of the molded shaving aid composition described herein, while one of the shaving aid portions can optionally include a different or additional composition. For example the front shaving aid portion may include the molded shaving aid composition, while the rear portion may include skin soothing and conditioning ingredients such as emollients and moisturizers in place of or in addition to the shaving aid portion.
b. Composition Dispensing Razors
In another embodiment, the shaving razor can be a composition dispensing razor. Various composition dispensing razors, wet and dry shavers, are known. Where a composition dispensing razor is desired, the composition contained within the razor reservoir can contain the pyrithione source. Additionally, the skin engaging member and/or molded shaving aids can also comprise the pyrithione source. Examples of suitable composition dispensing razors which can contain pyrithione sources are disclosed in U.S. application Ser. No. 13/586,365 to Jones et al, filed Aug. 15, 2012, P&G Docket No. Z-8606.
In one embodiment, the composition dispensing razor is as described in U.S. Patent Pub. 2010/0095528A1 disclosing a hair removal device comprising a handle and a collapsible reservoir suitable for containing a fluid to be dispensed during use of the hair removal device, the hair removal device additionally comprising a rigid container enclosing the collapsible reservoir, a fluid outlet adapted to allow fluid to exit both the collapsible reservoir and the rigid container, a first one-way valve adapted to allow air to enter but not exit the rigid container, and a pressure applicator, adapted to pressurize air in the rigid container, thereby collapsing the collapsible reservoir and causing fluid to be expelled through fluid outlet.
In one embodiment, the composition dispensing razor is as described in U.S. Patent Publ. No. 2010/0095529A1 disclosing a hair removal device comprising a handle and a collapsible reservoir suitable for containing a fluid to be dispensed during use of the hair removal device, the hair removal device additionally comprising a rigid container enclosing the collapsible reservoir, a fluid outlet adapted to allow fluid to exit both the collapsible reservoir and the rigid container, an orifice adapted to allow air to flow in or out of the rigid container, and a suction device (such as a power or manual pump), adapted to suck fluid out of the collapsible reservoir through fluid outlet.
US Patent Pub. No 2006/0150386A1 teaches another suitable composition dispensing razor which can be used in accordance with the present invention. According to this patent application, a razor is taught in which a flexible bladder comprising shaving agent is located within the handle. Dispensing takes place by squeezing flexible regions of the handle which act directly on the bladder to compress it and expel shaving composition contained therein.
Additional non-limiting examples of composition dispensing dry shavers have been disclosed in U.S. Patent Publ. No. 2008/0216322 and RE038934. For example, the hair removal device can be similar to the Phillips Norelco composition dispensing razor under the name of Cool Skin Shaver®. The shaver can have a large main head containing multiple rotary blades and dispenses a various types of moisturizing shave lotions out of the center of the rotary blades, allowing the composition to coat the shaving head and cutters to allegedly decrease friction with skin.
Other suitable dispensing wet razors have been disclosed in: U.S. Patents Publications 2006/00240380 to Chenvainu et al; 2007/0084074 to Szczepanowski et al; 2008/0307653A1 to Wattam (with a dispensing point at or near the pivot point of the cartridge), 2010/0236071A1 or 2010/0236072A1, and U.S. Pat. Nos. 7,127,817; 7,121,754; and 6,789,321, U.S. Patent Publ. Nos. 2011/0219621A1 and 2012/0102750A1. Other attempts to dispense fluids out of razors include devices with product dispense ports dispensing directly out of some portion of the razor handle for a two hand operation during use. See, e.g., U.S. Pat. Nos. 5,701,674, and 5,070,611 as well as in U.S. Patent Publ. No. 2012/0103928A1 (disclosing a personal care bottle with a first end wall and a second end wall opposite the first end wall. The second end wall defines an aperture. The personal care bottle has a top surface and an opposing bottom surface connecting the first and second end walls. The bottom surface has a wall thickness that is less than a wall thickness of the top surface), and U.S. Pat. No. 8,220,156 (disclosing A hair removal kit having a handle, a cover removably engagable to the handle, and a cartridge removably engagable to the handle. The cartridge has at least one blade. A removable dispensing unit is disposed within the handle. The dispensing unit has a pump, an applicator in liquid communication with the pump, and a reservoir having a first position and a second position. The reservoir is in liquid communication with the pump in the second position, but not in liquid communication with the pump in the first position).
In one embodiment, the first composition can be contained in a compartment or reservoir formed in the composition dispensing razor and can be dispense onto skin from said compartment or reservoir via a fluid flow path onto the skin. In one embodiment, the step of dispensing the first composition and the step of contacting said prepared surface happen concurrently during a shaving stroke. The composition can be dispensed forward of the razor cartridge or at or near the pivot point of the cartridge, or aft of the cartridge so composition is dispensed after the shave stroke. In one embodiment, the second composition can be supplied by a compartment or reservoir provided along with said razor, such as in a bottle for a post shave moisturizer.
All percentages disclosed herein, unless otherwise stated, are by weight of the named material itself that is found in the compositions, thereby excluding for example the weight associated with carriers, impurities and by-products found in the raw material.
It should be understood that every maximum numerical limitation given throughout this specification includes every lower numerical limitation, as if such lower numerical limitations were expressly written herein. Every minimum numerical limitation given throughout this specification includes every higher numerical limitation, as if such higher numerical limitations were expressly written herein. Every numerical range given throughout this specification includes every narrower numerical range that falls within such broader numerical range, as if such narrower numerical ranges were all expressly written herein.
All parts, ratios, and percentages herein, in the Specification, Examples, and Claims, are by weight and all numerical limits are used with the normal degree of accuracy afforded by the art, unless otherwise specified. The dimensions and values disclosed herein are not to be understood as being strictly limited to the exact numerical values recited. Instead, unless otherwise specified, each such dimension is intended to mean both the recited value and a functionally equivalent range surrounding that value. For example, a dimension disclosed as “40 mm” is intended to mean “about 40 mm”.
All documents cited in the DETAILED DESCRIPTION OF THE INVENTION are, in the relevant part, incorporated herein by reference; the citation of any document is not to be construed as an admission that it is prior art with respect to the present invention. To the extent that any meaning or definition of a term or in this written document conflicts with any meaning or definition in a document incorporated by reference, the meaning or definition assigned to the term in this written document shall govern.
Except as otherwise noted, the articles “a,” “an,” and “the” mean “one or more.”
While particular embodiments of the present invention have been illustrated and described, it would be obvious to those skilled in the art that various other changes and modifications can be made without departing from the spirit and scope of the invention. It is therefore intended to cover in the appended claims all such changes and modifications that are within the scope of this invention.

Claims

1) A method of treating skin comprising:

a) applying a first composition to a portion of skin to form a prepared surface;

b) contacting said prepared surface with a hair removal device to form a contacted surface, wherein said hair removal device comprises at least one of:

i) a skin engaging member,

ii) a molded shaving aid, and

iii) a combination thereof;

c) applying a second composition to said contacted surface to form a treated surface,

d) wherein at least one of said first composition, said hair removal device, and said second composition comprises a pyrithione source.

2) The method of claim 1, wherein said pyrithione source is selected from a group consisting of zinc pyrithione, sodium pyrithione, pyrithione acid, dipyrithione, chitonsan pyrithione, magnesium disulfide pyrithione, and combinations thereof.

3) The method of claim 1, wherein said pyrithione source is at a level of from about 0.01% to about 5%, by weight of said composition.

4) The method of claim 1, wherein said pyrithione source comprises a platelet zinc pyrithione (platelet ZPT), wherein the platelet ZPT comprises a mean particle diameter of about 0.5 microns to about 10 microns, a median particle diameter of about 0.5 microns to about 10 microns, and a thickness of about 0.6 microns to about 15 microns.

5) The method of claim 4, wherein the mean particle diameter of the platelet ZPT is about 1 micron to about 5 microns.

6) The method of claim 4, wherein the median particle diameter of the platelet ZPT is about 0.6 microns to about 0.7 microns.

7) The method of claim 1, wherein the composition which comprises the pyrithione source also comprises an additional antibacterial agent selected from the group consisting of triclocarban; triclosan; a halogenated diphenylether; hexachlorophene; 3,4,5-tribromosalicylanilide; salts of 2-pyridinethiol-1-oxide; and mixtures thereof.

8) The method of claim 1, wherein more than one of said first composition, said at least one skin engaging member, said at least one molded shaving aid, and said second composition comprises a pyrithione source.

9) The method of claim 1, wherein said hair removal device comprises at least one blade intermediate between two molded shaving aids.

10) The method of claim 9, wherein both of said two molded shaving aids comprise a pyrithione source.

11) The method of claim 1, further comprising applying a pre-treatment composition to said portion of skin prior to the application of said first composition.

12) A method of treating skin comprising:

a) applying a first composition to a portion of skin to form a prepared surface; and

b) contacting said prepared surface with a shaving razor to form a contacted surface, wherein said shaving razor comprises a razor cartridge comprising at least one skin engaging member, at least one molded shaving aid, and a combination thereof;

applying a second composition to said contacted surface to form a treated surface,.,

wherein said second composition comprises a zinc pyrithione.

13) The method of claim 12, wherein at least one of said first composition, said at least one skin engaging member, and said at least one molded shaving aid comprises a pyrithione source selected from a group consisting of zinc pyrithione, sodium pyrithione, pyrithione acid, dipyrithione, chitonsan pyrithione, magnesium disulfide pyrithione, and combinations thereof.

14) The method of claim 12, further comprising a step of rinsing said contacted surface before said step of applying said second composition.

15) The method of claim 12, wherein said first composition is supplied by a reservoir provided along with said razor.

16) The method of claim 15, wherein said step of applying said first composition and said step of contacting said prepared surface happen concurrently.

17) The method of claim 12, wherein said second composition is supplied by a reservoir provided along with said razor.

18) The method of claim 12, wherein said shaving razor is a composition dispensing device having at least one reservoir for containing a composition.

19) The method of claim 12, wherein said first composition is a shave preparation and said second composition is a post shave lotion or moisturizer.