Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K8/00—Cosmetics or similar toiletry preparations
  • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
  • A61K8/72—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds
  • A61K8/84—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds obtained by reactions otherwise than those involving only carbon-carbon unsaturated bonds
  • A61K8/86—Polyethers
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K8/00—Cosmetics or similar toiletry preparations
  • A61K8/02—Cosmetics or similar toiletry preparations characterised by special physical form
  • A61K8/0208—Tissues; Wipes; Patches
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K8/00—Cosmetics or similar toiletry preparations
  • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
  • A61K8/19—Cosmetics or similar toiletry preparations characterised by the composition containing inorganic ingredients
  • A61K8/26—Aluminium; Compounds thereof
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K8/00—Cosmetics or similar toiletry preparations
  • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
  • A61K8/72—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds
  • A61K8/81—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
  • A61K8/8105—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
  • A61K8/8117—Homopolymers or copolymers of aromatic olefines, e.g. polystyrene; Compositions of derivatives of such polymers
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
  • A61Q9/00—Preparations for removing hair or for aiding hair removal
  • A61Q9/02—Shaving preparations
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
  • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
  • B26B21/00—Razors of the open or knife type; Safety razors or other shaving implements of the planing type; Hair-trimming devices involving a razor-blade; Equipment therefor
  • B26B21/40—Details or accessories
  • B26B21/44—Means integral with, or attached to, the razor for storing shaving-cream, styptic, or the like
  • B26B21/443—Lubricating strips attached to the razor head

Definitions

• Shavl ng aid compri sing a l ubricant and an astringent and razor component.
• a shaving lubricant such as poly(ethylene oxide)
• the lubricant is preferably water soluble and is 0 deposited on the face during the act of shaving. It is known, for example, that most blade shavers shave repeatedly in the same area. The initial razor pass removes the foam or shaving cream and a substantial percentage of the whiskers. Repeated passes remove the remainder of the whiskers and are the primar ⁇ . . . . .
• second-stroke shaving refers to shaving strokes which occur in an area of the face after the lather 5 initially covering that area has been removed by shaving.
• SUBSTITUTE SHEET apertures throughout the surface containing poly(ethylene oxide) These admixtures could be formed, as taught by Booth, in a variety of ways such as by extruding or injection molding the admixture. Along with these possible additives. Booth's patent suggested the use of a blood coagulant for suppression of bleeding that occurs from nicks and cuts. Blood coagulation is the sequential process in which multiple coagulation factors of the blood interact, ultimately resulting in the formation of an insoluble fibrin clot. The Booth patent disclosed that a blood coagulant could be used alone or in combination with other additives including the lubricant which are singularly and collectively referred to herein as shaving aids. Summary of the Invention
• a water soluble astringent for simultaneous dispensing with another shaving aid, preferably a lubricant, during the act of shaving, minimizes the evidence of nicks associated with shaving.
• the delivery of astringent essentially simultaneously with the nicking resulting from shaving, also essentially eliminates the stinging sensation associated an astringent.
• the combination of lubricant and astringent also reduces the sensation of razor burn which is irritation due to skin trauma associated with repeated shaving over an unlubricated area.
• Fig. 1 is a perspective view of a razor head of one embodiment of the present invention.
• One preferred embodiment of the present invention utilizes a mixture of a lubricant useful for reducing razor drag, such as poly(ethylene oxide) , in combination with an astringent.
• a lubricant useful for reducing razor drag such as poly(ethylene oxide)
• This combination is delivered from a 1 razor head during the act of shaving making the astringent instantly available while minimizing the visible evidence of nicks, razor burn and the stinging sensation associated with the application of an 5 astringent after the nick has been perceived by the shaver.
• the term "razor head” is meant to include both a cartridge which is disposable and mounted on a permanent handle and the portion of the disposable 0 razor which corresponds to the cartridge. It is immaterial for purposes of the invention whether the lubricant and the astringent are delivered from the head of a disposable razor or from a cartridge attached to a permanent handle. Razor heads may utilize either a 5 single blade or a plurality of blades with the shaving edges in staggered relationship to each other. The blades may be separated by a spacer or by other means such as by utilizing blades having holes of different construction which correlate to indentations on posts 0 depending upwardly from the seat, downwardly from the cap, or both (see, for example, U.S.
• the razor heads may also utilize only a single blade.
• Razor heads commonly include a guard bar which directs the flow of skin to the blade or blades, a razor platform or seat from which the guard bar depends and which supports one of the blades, and a cap for protecting the blade or blades and/or maintaining the blades in a predetermined vertical and/or horizontal configuration.
• the razor head may also include a back formed from either the cap or seat and a set of cams formed as part of the bottom of the blade seat.
• a razor head having a shaving aid strip is illustrated in Fig. 1 in which the razor head 10 includes blade 18, cap 22 and seat 12. Guard bar 14 extends from seat 12 and the bottom portion of the seat 12 includes channel 20 which is designed to engage a suitable mating handle for use during shaving.
• a shaving aid strip 24 is positioned in a recess 26 mounted on cap 22. Strip 24 can be adhesively bound to cap 22 or can be affixed in place by the use of fold over tabs or the like. It is also possible, of course, to utilize a delivery configuration other than the strip 24 but it is preferred that the shaving aid is positioned on cap 22.
• a preferred lubricating strip comprises poly(ethylene oxide) .
• This strip may be formed of a water insoluble thermoplastic with poly(ethylene oxide) present as an admixture during the forming process as described in Booth. This combination produces a microporous delivery vehicle containing pol (ethylene oxide) in the microporous interstices as described in
• thermoplastic delivery vehicle as a means for discharging the leachable substrate is preferred for several reasons, among them that the shaving geometry will not be altered because the structure of the strip is formed from a water insoluble material rather than a water soluble material.
• an astringent is substantially uniformly dispersed throughout the pol (ethylene oxide) matrix and is therefore dispersed at a low concentration.
• the delivered shaving aid i.e. the combination of lubricant and astringent which is applied to the shaved surface substantially immediately after blade contact, produces a combination which unexpectedly substantially decreases the visible evidence of nicks while eliminating the discomfort normally associated with the application of an astringent.
• the present invention is therefore quite unlike previous astringents packaged in the form of styptic pencils which were made for application after shaving was completed.
• Astringents useful in this invention are preferably water soluble and readily dispersable throughout a poly(ethylene oxide) carrier. Some astringents such as those based upon trivalent chromium are not preferred because of the possibility of adverse skin reaction associated with chromium. While this possibility is somewhat remote due to the extremely low concentrations ultimately employed in the skin, more satisfactory astringents such as those based on trivalent aluminum salts or compounds such as mixed salts of Potassium and Aluminum Sulphate are readily available. Amongst the trivalent salts, aluminum sulfate, which is a major component of styptic pencils, is particularly preferred. Other possible astringents are Magnesium Sulphate (Glaubers Salt) and Iron Sulphate.
• Astringents such as aluminum sulfate are added in effective amounts sufficient to substantially eliminate the visible evidence of minor nicks during shaving, generally about 5% by weight of the poly(ethylene oxide) containing thermoplastic strip.
• the maximum amount of aluminum sulfate is determined by process limitations when a microporous substrate is used as the delivery system. Amounts of astringent greater than 15% by weight of the poly(ethylene oxide) containing thermoplastic strip may cause difficulties in blending during the extrusion step sometimes utilized for the manufacture of the microporous combination. While total amounts of aluminum sulfate or other astringents may vary depending on the process, it is generally preferred to keep the level below about 20%.
• an "astringent” is a substance which constricts blood vessels, shrinks mucous membranes, and thereby checks the discharge of blood, lymph, or other bodily fluids from a damaged surface.
• the uniform overall dispersion resulting from the delivery of the astringent in the poly(ethylene oxide) provides for the essentially instant constriction of blood vessels, before blood or lymph resulting from razor nicks is visually apparent. It is also theorized that the uniform dispersion of poly(ethylene oxide) eliminates the stinging often associated with the application of essentially pure concentrations of astringent with styptic pencils. In any event, the combination has proven surprisingly useful in maximizing the advantages associated with pol (ethylene oxide) and astringents.
• Example 1 A subjective shaving test was designed involving 100 males over the age of 18. Subjects chosen for this test were those who claimed to nick sometimes or always when they shave. The control for this test was a standard
• Super II Plus cartridge i.e. a Super II cartridge with a poly(ethylene oxide) containing strip.
• Super II is a trademark of the Schick Group of the Warner-Lambert Company, Morris Plains, New Jersey
• Super II Plus razor in which the poly(ethylene oxide) containing strip included 10% aluminum sulfate by weight of the poly(ethylene oxide) containing strip.
• the Super II Plus razor referred to above utilizes an extruded strip and in both the control and the comparison containing aluminum sulfate, the extruded strip used to form the microporous vehicle utilized polystyrene as the structural component. While the --- microporous strip can be formed by extrusion, injection molding, or compression, the percentages of the various components differ because of the relative ease or difficulty in liberation of the poly(ethylene oxide) when 5 the various processes are used. Lower levels of poly(ethylene oxide) are employed where, as is the case with extrusion, they can be more completely liberated. For this reason, extrusion is the currently preferred method of manufacture. Extrusion is also a simpler process when compared to injection molding.
• the amount of aluminum sulfate or other astringent dictates the level of poly(ethylene oxide) chosen. In all instances the percentages are by weight, with the remainder of the formulation made up of polystyrene preferably of the medium impact type.
• the poly(ethylene oxide) have a molecular weight (M w ) greater than 100,000.
• Example 2 Two formulations were prepared by extrusion containing medium impact polystyrene, aluminum sulfate and poly(ethylene oxide) .
• One of the formulations was identical to that set forth in Example 1 while the second formulation reduced the amount of polystyrene by 5% to a level of 23.9% and increased the level of poly(ethylene oxide) from 61 to 66%.
• These samples were compared to a sample containing no aluminum sulfate in a subjective test conducted over 4 days. In this example, each person was asked to shave one side of his face with one sample and the other side with a second sample. On the second day, the process was reversed. On the third day, the products were changed and the second formulation having increased poly(ethylene oxide) and aluminum sulfate was utilized in the same manner as day one and then the sides of the face were shaved in reverse order on day four.
• a nick for purposes of this invention is defined as any skin damage which will produce a blood spot under the test conditions set forth above.
• a microporous strip was prepared by compression.
• a formulation having the components and at the weights indicated below was mixed using a P-K Twin Shell Blender made by Patterson-Kelley, East Stroudsburg, Pa., for 30 minutes.
• Examples 2 and 3 set out above indicate that a shave having significantly fewer nicks results when wet shaving with the combination of pol (ethylene oxide) and aluminum sulfate. It is also clear that the presence of an astringent such as aluminum sulfate does not interfere with the lubricity desired from poly(ethylene oxide) and apparently, the combination is comparable to the poly(ethylene oxide) razor without astringent for overall comfort.

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• Public Health (AREA)
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• Engineering & Computer Science (AREA)
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• Chemical & Material Sciences (AREA)
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• Biomedical Technology (AREA)
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• Lubricants (AREA)

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• 1992
  • 1992-01-15 WO PCT/US1992/000262 patent/WO1992015278A1/en not_active Application Discontinuation
  • 1992-01-15 CA CA002104603A patent/CA2104603A1/en not_active Abandoned
  • 1992-01-15 EP EP19920904820 patent/EP0574426A1/de not_active Withdrawn
  • 1992-01-15 JP JP4505332A patent/JPH06504695A/ja active Pending
  • 1992-01-15 AU AU12546/92A patent/AU1254692A/en not_active Abandoned

Non-Patent Citations (1)

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