CA2053665A1 - Shaving system - Google Patents
Shaving systemInfo
- Publication number
- CA2053665A1 CA2053665A1 CA 2053665 CA2053665A CA2053665A1 CA 2053665 A1 CA2053665 A1 CA 2053665A1 CA 2053665 CA2053665 CA 2053665 CA 2053665 A CA2053665 A CA 2053665A CA 2053665 A1 CA2053665 A1 CA 2053665A1
- Authority
- CA
- Canada
- Prior art keywords
- shaving
- vinyl acetate
- percent
- weight
- ethylene vinyl
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Abstract
SHAVING SYSTEM
Abstract of the Disclosure A shaving system having a blade and support structure that define external skin engaging surfaces in front of and to the rear of the cutting edge of the blade, the support structure including a shaving aid composite comprised of a blend of ethylene vinyl acetate and a shaving aid composition adjacent the cutting edge of the blade.
CASE: 7897
Abstract of the Disclosure A shaving system having a blade and support structure that define external skin engaging surfaces in front of and to the rear of the cutting edge of the blade, the support structure including a shaving aid composite comprised of a blend of ethylene vinyl acetate and a shaving aid composition adjacent the cutting edge of the blade.
CASE: 7897
Description
; '; 20~36~
~HAVING SYSTEH
Thi~ lnvention relates to shavlng systems, and more particularly to shavlng ~y8tem8 0~ the wet shave type.
In shavinq sy~to~ ot the vet ~hav- type, factor~ ~uch a~ the frictional drag ot the razor across the skin, the force needed to sever ~airs, and irrltatlon o~ preexisting skin damago can create a degree ot ~having ~lscom~ort. Discomtort, and other problems accompanylng wet shavlng ~ystem~, can be alleviated by the appllcatlon o~ shavlng aid~ to the skln. Shaving aids may be applled prior to, during, or after shaving. A numb~r o~ proble~s accompany the use ot pre- and po~t-applied shaving aid~. Pre-applied-shaving aids can evaporate or can be carried away fromthe site o~ application by repeated ~troke~ of the razor. Post-applied-shaving aids are not present on the skln during sha~lng and thus their applicatlon may be to lat- to provent an unwantod attect. Both pre-applled and po-t-appll-d ~having alds add addltional steps to the shaving procQss.
Proposal~ have been made to incorporate a shaving aid 8.g., lubricant, whi~ker softener, razor cleanser, medicinal agent, cosmetlc agent or combination thereo~, into a razor, e.g., by depositing a shaving aid in a recess on the razor, by incorporating a shaving aid directly into one or mor~ molded polymeric components of CASE: 7897 20536G~
the razor, by adhesively securinq a shaving aid composite to the razor, and by use of a mechanlcal connection between a shaving aid composite and the razor. A water-soluble shaving aid, e.g. polyethylene oxide, has been mixed with non-water-soluble ~aterial, e.g., a polystyrene polymer, to form an insoluble polymer/soluble shaving aid ~omposite. The composite has been mounted on razor and shaving cartridge structures, ad~acent the shaving edge or edges, of single or mult~ple blade shaving syste~. Upon exposure to water, the water-soluble shaving aid leaches from the composite onto the s~in.
In accordance with one aspect of th~
invention, there is provided a shaving unit that comprises at least one blade and a shaving aid composite that h-s a surface for engaging the user's skin adjacent the blade edge or edg2s.
The shaving unit may be o~ the disposable cartridge type adapted for coupling to and uncoupling from a razor handle or may be integral with a handle so that the complete razor is discarded as a unit when the blade or blades become dulled. The blade edge (or edges) cooperate with skin engaging surfaces to define shaving geometry. ~he shav~ng aid composite is a matrix of water lnsoluble ethylene vinyl acetate (EVA - a copolymer of ethylene and vinyl acetate) and an effective amount of one or more shaving aids disposed in tho ethylene vinyl acetate matrix and which leaches out with water polyethylene oxide. Tha shaving aid composite can also be a mixture of ethylene vinyl acetate and an effective a~ount of one or more water-insoluble shaving a$d (e.g., silicone copolymer or polytetrafluoroethylene (~eflon) powder) and preferably has a skin engaging surface.
Ethylene vinyl acetate is a copolymer of ethylene and vinyl acetate and i5 available commercially from a number of ources. The propertie~ of an ethylene ;
~ 20~3~6~
vinyl acetate copolymer depend in large part on the percentage of vinyl acetate it contains. Commercial grades of ethylene vinyl acetate range in vinyl acetate content from five to fifty weight percent and range in melt index from 0.3 to 43 g/min, in hardness from 73 Shore A to 98 Shore A or 24 Shore D to 47 Shore D, and in Vicat softening temperature from 80-C. to 36 C.
Increasing the amount of vinyl acetate in an ethylene vinyl acetate copolymer reduces its crystallinity, increases it~ flexibility and reduces its hardness.
An ethylene vinyl acetate copolymer containing twenty five weight percent vinyl acetate forms shaving aid composites with an improved combination of leach rate, flexibility, softness, ~trength, abrasion resistance, resistance to cracking, softening temperature attributes, and processability. In particular embodiments the shaving aid composite contains between ten percent and fifty percent by weight ethylene vinyl acetate and between fifty percent and ninety percent by weight shaving aid material. Suitable water-soluble and non-water soluble shaving aid materials include, for example, polyethylene oxide, polyvinyl pyrrolidone, polyacrylamide, hydroxypropyl cellulose, polyvinyl imidazonline, polyhydroxyethylmethacrylate, silicone copolymers and sucrose stearate, vitamin E. Panthenol, aloe, essential oils and other moisturizers and soothing agents. The proportions may be varied but the composite pxeferably includes at least fifty percent of water-soluble shaving aid materials. In particular embodiments, the shaving aid composite includes additives such as color dyes and bactericides in minor amounts.
The low softening temperature of ethylene vinyl acetate copolymers allows lower processing temperatures in the production of shaving aid composites. Elvax 360 (Dupont), a commercial ethylene vinyl acetate copolymer containing twenty-five percent ~0~36~
- 4 - .
vinyl acetate, has a Vicat softening temperature of 53-C., which i8 approximately 40-C. below that of polystyrene. Shaving aid composites formed from ethylene vinyl acetate copolymers can be molded, extruded, or otherwise manufactured at lower temperatures than those used for other insoluble polymerfi, such a~ polystyrene with resulting reduced thermal degradation of shaving aid material and other functional addltives, such polyethylene oxide, ~ilicone, plasticizers, moisturizers, perfumes, and vitamins. The ethylene vinyl acetate copolymer may also act as a hot melt adhesive thus providing a simple and effective means o~ attaching the shaving aid composite to razor structure.
Particular embodiments include shaving aid composites of the following compositions: twenty-five percent by weight ethylene vinyl acetate (twenty-five percent vinyl acetate) and seventy-five percent by weight polyethylene oxide, (this shaving aid composite can be molded or extruded at approximately 100-140-C.);
seventy percent by weight ethylene vinyl acetate (twenty-five percent vinyl acetate) and thirty percent by weight silicone copolymer (this shaving aid composite can be ex*ruded at approximat~ly lOO-C.); eighteen percent by weight ethylene vinyl acetate ~twenty-five percent vinyl acetate), seventy-seven percent by weight polyethylene oxide, and five percent by weight sucrose stearate (this shaving aid composlte can be molded at approximately 130-C.); and twenty-four percent by weight ethylene vinyl acetate (twenty-five percent vinyl acetate), seventy-two percent by weight polyethylene oxide, and four percent by weight silicone wax (this shaving a~d composite may be molded at approximately 130-C.). Extrusion and molding temperatures and pressures vary with the particular polymers used.
The nature and relative proportions of ths water-soluble and non-water soluble components and water 20~3~
insoluble ethylene vinyl acetate in the polymer blend should be such that the shavlng a~d composite has adequate mechanical strength, both as initially produced and after a significant amount of the water-soluble S material has been leached out, the quantity of the water-soluble material being sufficient to provide effective shaving assistance, such as lubrication, for the entire expected life of the blade or blades. In case o~ a water-soluble component contained in the shav~ng aid composite, comfortable and effective shaving can be obtained by wetting the shaving area with water prior to shaving. The water present on the shaving area leache~ out a proportion of the water-soluble material for delivery to the skin surface.
Shaving ald composites of ethylene vinyl acetate copolymers with appropriate vinyl acetate content are soft, flexible, resilient, display excellent resistance to cracking, and release water-soluble ~
shaving aids in relatively linear fashion. A shaving system with such a shaving aid composite results in a product that possesses an attractive appearance and that produces a comfortable shave.
Other feature~ and advantages will be seen as the following description of particular embodiments progresses, in conjunction with the drawings, in which:
Fig. 1 is a perspective view of a razor unit in accordance with the invention;
Fig. 2 is a sectional view taken along the line 2-2 of Fig. 1: and Fig. 3 is a perspective view of another razor unit in accordance with the invention.
~he shaving unit 10 shown in Figs. l and 2 includes ba~e or platform member 12 molded of h~gh impact polystyrene that includes integral coupling groove structure 14 for attachment to a razor handle and guard structure 16 that defines a transversely extending forward skin engaging surface 18. on the upper surface 2053~5 of pla~foro 12 are disposed steel leading blade 20 having a sharpened edge 22, steel following blade 24 having sharpened edge 26, and aluminum spacer member 28 that maintains blades 20 and 24 in spaced relation. Cap member 30 ig molded of high impact polystyrene and has body portion 32 that defines skin engaging surface 34 that extends transversely between forwardly pro~ecting end walls 36 and has a front edge 38 that is disposed rearwardly of blade edge 26. Integral rivet portions 40 extend downwardly from tran~versely extending body portion 32 and pass through holes in ~lades 20 and 24, spacer 28, and platform 12 to secure cap 30, blades 20, 24 and spacer 28 on platfor~ 12. Affixed to skin engaging surface 34 is shaving aid composite 42.
The shaving unit 50 shown in Fig. 3 iS of the type shown in Jacobson U.S. Patent 4,586,255 a~d includes body 52 with front portion 54 and rear portion 56. Resiliently secured in body 52 are guard member S8, leading blade unit 60 and trailing blade unit 62. A
shaving aid composite in the form of elongated insert member 64 i~ frictionally locked in opening 66 of rear portion 56.
~ he following example~ show by way of illustration and not by way of limitation practice of 25 the invention.
13X~p~
A blend i~ formed of eighty percent by weight of polyethylene oxide (speclfically a miXturQ o~ forty-eight weight percent Polyox Coagulant polyethylene oxide -- five million molecular weight percent Polyox N-750 polyethylene oxide -- 300,000 molecular weight - the polyethylene oxide of the ultimate blend having a molecular weight of about 3. 5 million); twenty percent by weight of ethylene vinyl acetate (twenty-five percent vinyl acetate) (Elvax 360) and color dye and bactericide additives in minor amounts. The blend is extruded at a temperature of about 120-C. to ~orm a strip of shaving 20~366~
aid composite material. Mem~er 42 is sliced from the extruded strip and secured in recess 44. In similar manner, the blend is extruded to form inserts 64 which are secured in openings 66 of shaving units 50. The resulting cartridge possess good overall shaving performance.
Example 2 A blend is formed of forty-three percent by - weight of polyethylene oxide (~ive million average molecular weight), thirty-two percent by weight polyethylene oxide (300,000 average molecular weight), and twenty-five percent by weight of water insoluble ethylene vinyl acetate (Elvax 360). The blend i5 extruded at a temperature of about 115'C. to form a strip. Members 42 are sliced from extruded strip and secured to shaving cartridges. The cartridges provides excellent shaving comfort and are significantly better in overall shaving performance than blends of polystyrene and similar polyethylene oxide proportions.
Example 3 A blend of eighty percent by weight of ethylene vinyl acetate copolymer (containing twenty-five percent vinyl acetate) and twenty percent by weight of silicone copolymer (e.q. Trimethylsiloxysilicate) is extruded at approximately lOO'C. Members 42 and 64 are sliced from extruded strip and secured to the caps of razor cartridges 10 and 50. The resulting razor cartridges posses~ good overall shaving performance.
Example 4 A blend of eighteen percent ethylene vinyl acetate ttwenty-five percent vinyl acetate); five percent sucrose stearate; and seventy-seven percent by weight of a water-soluble polymer (a mixture of forty percent by weight of Polyox Coagulant polyethylene oxide and forty percent by weight of Polyox WSRN-750 polyethylene oxide) i~ molded at a temperature of 130'C.
to form members 42 and inserts 64. The resulting ~0~3~
shaving aid composite members are secured to their respective razor structures 10, 50 and the resulting razor structures exhibits good shaving performance.
Example 5 A mixture of twenty-four percent by weight ethylene vinyl acetate (twenty-five percent vinyl acetate): forty-three percent by weight of Polyox Coagulant polyethylene oxide: twenty-nine percent by weight Polyox WSRN-750 polyethylene oxide; and four percent by weight silicone wax is molded at a temperature of 130-C. The same mixture is extruded at a temperature of llO-C and attached to razors. The resulting shaving aid compcsite~ 42, 64 are soft, flexible, resilient, and show excellent resistance to cracXing, and shave tests indicate that the resulting razors have excellent shaving characteristics.
Shaving units 10, 50 are used in conventional manner (typically in con~unction with a shaving cream or gel) with polyethylene oxide and/or other shaving aid material beinq dispensed fro.m member 42, 64 during shaving. With each stroke of ti.e razor, shaving aid material is immediately applied to the skin and thus provides shaving aid material that is continually renewed during shaving operations over the useful life of shaving units 10, 50.
~HAVING SYSTEH
Thi~ lnvention relates to shavlng systems, and more particularly to shavlng ~y8tem8 0~ the wet shave type.
In shavinq sy~to~ ot the vet ~hav- type, factor~ ~uch a~ the frictional drag ot the razor across the skin, the force needed to sever ~airs, and irrltatlon o~ preexisting skin damago can create a degree ot ~having ~lscom~ort. Discomtort, and other problems accompanylng wet shavlng ~ystem~, can be alleviated by the appllcatlon o~ shavlng aid~ to the skln. Shaving aids may be applled prior to, during, or after shaving. A numb~r o~ proble~s accompany the use ot pre- and po~t-applied shaving aid~. Pre-applied-shaving aids can evaporate or can be carried away fromthe site o~ application by repeated ~troke~ of the razor. Post-applied-shaving aids are not present on the skln during sha~lng and thus their applicatlon may be to lat- to provent an unwantod attect. Both pre-applled and po-t-appll-d ~having alds add addltional steps to the shaving procQss.
Proposal~ have been made to incorporate a shaving aid 8.g., lubricant, whi~ker softener, razor cleanser, medicinal agent, cosmetlc agent or combination thereo~, into a razor, e.g., by depositing a shaving aid in a recess on the razor, by incorporating a shaving aid directly into one or mor~ molded polymeric components of CASE: 7897 20536G~
the razor, by adhesively securinq a shaving aid composite to the razor, and by use of a mechanlcal connection between a shaving aid composite and the razor. A water-soluble shaving aid, e.g. polyethylene oxide, has been mixed with non-water-soluble ~aterial, e.g., a polystyrene polymer, to form an insoluble polymer/soluble shaving aid ~omposite. The composite has been mounted on razor and shaving cartridge structures, ad~acent the shaving edge or edges, of single or mult~ple blade shaving syste~. Upon exposure to water, the water-soluble shaving aid leaches from the composite onto the s~in.
In accordance with one aspect of th~
invention, there is provided a shaving unit that comprises at least one blade and a shaving aid composite that h-s a surface for engaging the user's skin adjacent the blade edge or edg2s.
The shaving unit may be o~ the disposable cartridge type adapted for coupling to and uncoupling from a razor handle or may be integral with a handle so that the complete razor is discarded as a unit when the blade or blades become dulled. The blade edge (or edges) cooperate with skin engaging surfaces to define shaving geometry. ~he shav~ng aid composite is a matrix of water lnsoluble ethylene vinyl acetate (EVA - a copolymer of ethylene and vinyl acetate) and an effective amount of one or more shaving aids disposed in tho ethylene vinyl acetate matrix and which leaches out with water polyethylene oxide. Tha shaving aid composite can also be a mixture of ethylene vinyl acetate and an effective a~ount of one or more water-insoluble shaving a$d (e.g., silicone copolymer or polytetrafluoroethylene (~eflon) powder) and preferably has a skin engaging surface.
Ethylene vinyl acetate is a copolymer of ethylene and vinyl acetate and i5 available commercially from a number of ources. The propertie~ of an ethylene ;
~ 20~3~6~
vinyl acetate copolymer depend in large part on the percentage of vinyl acetate it contains. Commercial grades of ethylene vinyl acetate range in vinyl acetate content from five to fifty weight percent and range in melt index from 0.3 to 43 g/min, in hardness from 73 Shore A to 98 Shore A or 24 Shore D to 47 Shore D, and in Vicat softening temperature from 80-C. to 36 C.
Increasing the amount of vinyl acetate in an ethylene vinyl acetate copolymer reduces its crystallinity, increases it~ flexibility and reduces its hardness.
An ethylene vinyl acetate copolymer containing twenty five weight percent vinyl acetate forms shaving aid composites with an improved combination of leach rate, flexibility, softness, ~trength, abrasion resistance, resistance to cracking, softening temperature attributes, and processability. In particular embodiments the shaving aid composite contains between ten percent and fifty percent by weight ethylene vinyl acetate and between fifty percent and ninety percent by weight shaving aid material. Suitable water-soluble and non-water soluble shaving aid materials include, for example, polyethylene oxide, polyvinyl pyrrolidone, polyacrylamide, hydroxypropyl cellulose, polyvinyl imidazonline, polyhydroxyethylmethacrylate, silicone copolymers and sucrose stearate, vitamin E. Panthenol, aloe, essential oils and other moisturizers and soothing agents. The proportions may be varied but the composite pxeferably includes at least fifty percent of water-soluble shaving aid materials. In particular embodiments, the shaving aid composite includes additives such as color dyes and bactericides in minor amounts.
The low softening temperature of ethylene vinyl acetate copolymers allows lower processing temperatures in the production of shaving aid composites. Elvax 360 (Dupont), a commercial ethylene vinyl acetate copolymer containing twenty-five percent ~0~36~
- 4 - .
vinyl acetate, has a Vicat softening temperature of 53-C., which i8 approximately 40-C. below that of polystyrene. Shaving aid composites formed from ethylene vinyl acetate copolymers can be molded, extruded, or otherwise manufactured at lower temperatures than those used for other insoluble polymerfi, such a~ polystyrene with resulting reduced thermal degradation of shaving aid material and other functional addltives, such polyethylene oxide, ~ilicone, plasticizers, moisturizers, perfumes, and vitamins. The ethylene vinyl acetate copolymer may also act as a hot melt adhesive thus providing a simple and effective means o~ attaching the shaving aid composite to razor structure.
Particular embodiments include shaving aid composites of the following compositions: twenty-five percent by weight ethylene vinyl acetate (twenty-five percent vinyl acetate) and seventy-five percent by weight polyethylene oxide, (this shaving aid composite can be molded or extruded at approximately 100-140-C.);
seventy percent by weight ethylene vinyl acetate (twenty-five percent vinyl acetate) and thirty percent by weight silicone copolymer (this shaving aid composite can be ex*ruded at approximat~ly lOO-C.); eighteen percent by weight ethylene vinyl acetate ~twenty-five percent vinyl acetate), seventy-seven percent by weight polyethylene oxide, and five percent by weight sucrose stearate (this shaving aid composlte can be molded at approximately 130-C.); and twenty-four percent by weight ethylene vinyl acetate (twenty-five percent vinyl acetate), seventy-two percent by weight polyethylene oxide, and four percent by weight silicone wax (this shaving a~d composite may be molded at approximately 130-C.). Extrusion and molding temperatures and pressures vary with the particular polymers used.
The nature and relative proportions of ths water-soluble and non-water soluble components and water 20~3~
insoluble ethylene vinyl acetate in the polymer blend should be such that the shavlng a~d composite has adequate mechanical strength, both as initially produced and after a significant amount of the water-soluble S material has been leached out, the quantity of the water-soluble material being sufficient to provide effective shaving assistance, such as lubrication, for the entire expected life of the blade or blades. In case o~ a water-soluble component contained in the shav~ng aid composite, comfortable and effective shaving can be obtained by wetting the shaving area with water prior to shaving. The water present on the shaving area leache~ out a proportion of the water-soluble material for delivery to the skin surface.
Shaving ald composites of ethylene vinyl acetate copolymers with appropriate vinyl acetate content are soft, flexible, resilient, display excellent resistance to cracking, and release water-soluble ~
shaving aids in relatively linear fashion. A shaving system with such a shaving aid composite results in a product that possesses an attractive appearance and that produces a comfortable shave.
Other feature~ and advantages will be seen as the following description of particular embodiments progresses, in conjunction with the drawings, in which:
Fig. 1 is a perspective view of a razor unit in accordance with the invention;
Fig. 2 is a sectional view taken along the line 2-2 of Fig. 1: and Fig. 3 is a perspective view of another razor unit in accordance with the invention.
~he shaving unit 10 shown in Figs. l and 2 includes ba~e or platform member 12 molded of h~gh impact polystyrene that includes integral coupling groove structure 14 for attachment to a razor handle and guard structure 16 that defines a transversely extending forward skin engaging surface 18. on the upper surface 2053~5 of pla~foro 12 are disposed steel leading blade 20 having a sharpened edge 22, steel following blade 24 having sharpened edge 26, and aluminum spacer member 28 that maintains blades 20 and 24 in spaced relation. Cap member 30 ig molded of high impact polystyrene and has body portion 32 that defines skin engaging surface 34 that extends transversely between forwardly pro~ecting end walls 36 and has a front edge 38 that is disposed rearwardly of blade edge 26. Integral rivet portions 40 extend downwardly from tran~versely extending body portion 32 and pass through holes in ~lades 20 and 24, spacer 28, and platform 12 to secure cap 30, blades 20, 24 and spacer 28 on platfor~ 12. Affixed to skin engaging surface 34 is shaving aid composite 42.
The shaving unit 50 shown in Fig. 3 iS of the type shown in Jacobson U.S. Patent 4,586,255 a~d includes body 52 with front portion 54 and rear portion 56. Resiliently secured in body 52 are guard member S8, leading blade unit 60 and trailing blade unit 62. A
shaving aid composite in the form of elongated insert member 64 i~ frictionally locked in opening 66 of rear portion 56.
~ he following example~ show by way of illustration and not by way of limitation practice of 25 the invention.
13X~p~
A blend i~ formed of eighty percent by weight of polyethylene oxide (speclfically a miXturQ o~ forty-eight weight percent Polyox Coagulant polyethylene oxide -- five million molecular weight percent Polyox N-750 polyethylene oxide -- 300,000 molecular weight - the polyethylene oxide of the ultimate blend having a molecular weight of about 3. 5 million); twenty percent by weight of ethylene vinyl acetate (twenty-five percent vinyl acetate) (Elvax 360) and color dye and bactericide additives in minor amounts. The blend is extruded at a temperature of about 120-C. to ~orm a strip of shaving 20~366~
aid composite material. Mem~er 42 is sliced from the extruded strip and secured in recess 44. In similar manner, the blend is extruded to form inserts 64 which are secured in openings 66 of shaving units 50. The resulting cartridge possess good overall shaving performance.
Example 2 A blend is formed of forty-three percent by - weight of polyethylene oxide (~ive million average molecular weight), thirty-two percent by weight polyethylene oxide (300,000 average molecular weight), and twenty-five percent by weight of water insoluble ethylene vinyl acetate (Elvax 360). The blend i5 extruded at a temperature of about 115'C. to form a strip. Members 42 are sliced from extruded strip and secured to shaving cartridges. The cartridges provides excellent shaving comfort and are significantly better in overall shaving performance than blends of polystyrene and similar polyethylene oxide proportions.
Example 3 A blend of eighty percent by weight of ethylene vinyl acetate copolymer (containing twenty-five percent vinyl acetate) and twenty percent by weight of silicone copolymer (e.q. Trimethylsiloxysilicate) is extruded at approximately lOO'C. Members 42 and 64 are sliced from extruded strip and secured to the caps of razor cartridges 10 and 50. The resulting razor cartridges posses~ good overall shaving performance.
Example 4 A blend of eighteen percent ethylene vinyl acetate ttwenty-five percent vinyl acetate); five percent sucrose stearate; and seventy-seven percent by weight of a water-soluble polymer (a mixture of forty percent by weight of Polyox Coagulant polyethylene oxide and forty percent by weight of Polyox WSRN-750 polyethylene oxide) i~ molded at a temperature of 130'C.
to form members 42 and inserts 64. The resulting ~0~3~
shaving aid composite members are secured to their respective razor structures 10, 50 and the resulting razor structures exhibits good shaving performance.
Example 5 A mixture of twenty-four percent by weight ethylene vinyl acetate (twenty-five percent vinyl acetate): forty-three percent by weight of Polyox Coagulant polyethylene oxide: twenty-nine percent by weight Polyox WSRN-750 polyethylene oxide; and four percent by weight silicone wax is molded at a temperature of 130-C. The same mixture is extruded at a temperature of llO-C and attached to razors. The resulting shaving aid compcsite~ 42, 64 are soft, flexible, resilient, and show excellent resistance to cracXing, and shave tests indicate that the resulting razors have excellent shaving characteristics.
Shaving units 10, 50 are used in conventional manner (typically in con~unction with a shaving cream or gel) with polyethylene oxide and/or other shaving aid material beinq dispensed fro.m member 42, 64 during shaving. With each stroke of ti.e razor, shaving aid material is immediately applied to the skin and thus provides shaving aid material that is continually renewed during shaving operations over the useful life of shaving units 10, 50.
Claims (12)
1. A shaving system of the wet shave type comprising a blade member, and structure defining an external skin-engaging portion adjacent the shaving edge of said blade member, said skin-engaging portion including a shaving aid composite of an ethylene vinyl acetate matrix and an effective amount of a shaving aid composition in intimate mixture with said ethylene vinyl acetate matrix.
2. The shaving system of claim 1, wherein said ethylene vinyl acetate carrier contains between five and fifty weight percent vinyl acetate.
3. The shaving system of claim 1, wherein said ethylene vinyl acetate carrier contains approximately twenty-five percent vinyl acetate.
4. The shaving system of claim 1, wherein said shaving aid composite comprises ten to fifty percent by weight ethylene vinyl acetate and fifty to ninety percent by weight shaving aid.
5. The shaving system of claim 1, wherein said shaving aid composite comprises a blend of ethylene vinyl acetate, high molecular weight polyethylene oxide that has a molecular weight of above three million and low molecular weight polyethylene oxide that has a molecular weight of less than one million.
6. The shaving system of claim 5, wherein said shaving aid composite comprises approximately twenty-five percent by weight ethylene vinyl acetate, approximately forty-five percent by weight of said high molecular weight polyethylene oxide and approximately thirty percent by weight of said low molecular weight polyethylene oxide.
7. The shaving system of claim 1, wherein said shaving aid composition is selected from the group consisting of polyethylene oxide, polyvinyl pyrrolidone, polyacrylamide, hydroxypropyl cellulose, polyvinyl imidazonline polyhydroxyethylmethacrylate, silicone copolymers, sucrose stearate, essential oils and other CASE: 7897 moisturizers and soothing agents.
8. The shaving system of claim 7, wherein said shaving aid composite comprises about seventy to ninety percent by weight ethylene vinyl acetate and about ten to thirty percent by weight of said silicone copolymer.
9. The shaving system of claim 7, wherein said shaving aid composite comprises about twenty-five percent by weight ethylene vinyl acetate, about seventy percent by weight polyethylene oxide, and about five percent by weight silicone wax.
10. The shaving system of claim 7, wherein said shaving aid composite comprises about twenty percent by weight ethylene vinyl acetate, about seventy percent by weight polyethylene oxide and about five percent by weight sucrose stearate.
11. A method for producing a shaving aid composite for a shaving system of the wet shave type comprising a blade member and a composite having an external skin-engaging portion adjacent the shaving edge of said blade member, which comprises the steps of:
(a) forming a blend of an ethylene vinyl acetate polymer and an effective amount of a shaving aid composition, and (b) extruding said blend to form a strip comprising said composite.
(a) forming a blend of an ethylene vinyl acetate polymer and an effective amount of a shaving aid composition, and (b) extruding said blend to form a strip comprising said composite.
12. A shaving aid composite for a shaving system of the wet shave type comprising a blade member and a composite having an external skin-engaging portion adjacent the shaving edge of said blade member, said composite comprising an ethylene vinyl acetate matrix and an effective amount of a shaving aid composition in intimate mixture with said ethylene vinyl acetate matrix.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2053665 CA2053665A1 (en) | 1991-10-17 | 1991-10-17 | Shaving system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2053665 CA2053665A1 (en) | 1991-10-17 | 1991-10-17 | Shaving system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2053665A1 true CA2053665A1 (en) | 1993-04-18 |
Family
ID=4148587
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2053665 Abandoned CA2053665A1 (en) | 1991-10-17 | 1991-10-17 | Shaving system |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2053665A1 (en) |
-
1991
- 1991-10-17 CA CA 2053665 patent/CA2053665A1/en not_active Abandoned
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |