CA2053666C - Shaving system - Google Patents
Shaving systemInfo
- Publication number
- CA2053666C CA2053666C CA 2053666 CA2053666A CA2053666C CA 2053666 C CA2053666 C CA 2053666C CA 2053666 CA2053666 CA 2053666 CA 2053666 A CA2053666 A CA 2053666A CA 2053666 C CA2053666 C CA 2053666C
- Authority
- CA
- Canada
- Prior art keywords
- shaving
- water
- weight
- shaving aid
- release
- 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.)
- Expired - Fee Related
Links
Landscapes
- Cosmetics (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
A shaving unit comprises at least one blade and a shaving composite that has a surface for engaging the user's skin adjacent the blade edge. The shaving unit may be of a 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. The shaving aid composite is a mixture of water insoluble matrix material, an effective amount of shaving aid material, and a water soluble low molecular weight release enhancing agent that enhances the releasability of the shaving aid material from the matrix material.
Description
CA 020~3666 1998 -11- 06 SHAVING SYSTEM
This invention relates to shaving systems, and more particularly to shaving systems of the wet shave type.
In shaving systems of the wet shave type, factors such as the frictional drag of the razor across the skin, the force needed to sever hairs, and irritation of preexisting skin damage can create a degree of shaving discomfort. Discomfort, and other problems accompanying wet shaving systems, can be alleviated by the application of shaving aids to the skin. Shaving aids may be applied prior to, during, or after shaving. A number of problems accompany the use of pre- and post-applied shaving aids. Pre-applied-shaving aids can evaporate or can be carried away fromthe site of application by repeated strokes of the razor. Post-applied-shaving aids are not present on the ~kin during shaving and thus their application may be to late to prevent an unwan~ed affect. Both pre-applied and post-applied shaving aids add additional steps to the shaving process.
~ Lv~0-~18 have been made to incorporate a shaving aid e.g., lubricant, w~ker softener, razor cle~n~er, medicinal agent, cosmetic agent or combination thereof, into a razor, e.g., by depositing a shaving aid in a ~ on the razor, by incorporating a shaving aid directly into one or more molded polymeric components of the razor, by adhesively securing a shaving aid composite to the razor, and by use of a mechanical 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 material, e.g., a polystyrene polymer, to form an insoluble polymer/soluble shaving aid composite. The composite has been mounted on razor and shaving cartridge structures, ad~acent the shaving edge or edges, of single or multiple blade shaving system. Upon exposure to water, the water-soluble shaving aid leaches from the composite onto the skin.
Extruded composites with relatively large amounts of shaving agent material (up to 80% by weight) and relatively low amounts of water insoluble matrix material tas little as 20% by weight) are relatively weak and have a ten~ncy towards mQch~nical failure, both in assembly and in use. Increase in mechanical strength can be obt~ n~~ with increased amounts of the matrix material. However, such increase reduces the releasability of the shaving material.
In accordance with one aspect of the invention, there i~ provided a shaving unit that comprises at least one blade and a shaving composite that has a surfacQ for engaging the user's skin adjacent the blade edge. The Qhaving unit may be of a 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 i~ rded as a unit when the blade or bladea become dulled. The blade edge ~or edges) cooperate with skin engaging surfaces to define shaving geometry. The shaving aid compoQite is a mixture of water insoluble matrix material, an effective amount of shaving aid material, and a water soluble low molecular weight releasQ enhancing agent that ~h~nceC
the releasability of the shaving aid material from the matrix material.
. CA 020~3666 1998-11-06 Preferably, the composite includes 20-60 percent by weight of the water-insoluble matrix material, 20-75 percent by weight of the shaving aid material, and 5-20 percent by weight of the release enhancing agent. Suitable water-insoluble matrix materials include, for example, polyethylene, poly~ropylene, polystyrene and polyacetyl. Suitable release-enhancing agents include, for example, polyethylene glycol, methoxypolyethylene glycol, lo methylcellulose, and carboxypolymethylene. Suitable shaving aid materials include, for example, polyethylene oxide, polyvinyl pyrrolidone, polyacrylamide, hydroxypropyl cellulose, polyvinyl imidazonline, polyhydroxyethylmethacrylate, silicone copolymers, sucrose stearate, vitamin E, panthenol, aloe and essential oils such as menthol.
In particular embodiments, the shaving agent composite i~ a member of extrusion-oriented blend of polymeric materials that contains water-soluble and water-insoluble materials, the nature and relative proportion~ of the water-soluble and water-insoluble polymeric matQrials being such that the member has adequate me~h~cal strength, both as initially produced and after a signi~icant amount of the water-soluble 2S material has been leached out, the quantity of the watQr-solublQ material being sufficient to provide ef~ective ~having a~sistance, such a~ lubrication, for the entire expected life of the blade or blades.
Preferably, the molecular weight of the release s~hA~cing agent is less than five percent of the average molecular we~ght of the shaving aid material.
In a particular embodiment, the release-Pnh~cing agent is polyethylene glycol of about 4,500 molecular weight and the shaving aid material is polyethylene oxide of at least about one million molecular weight.
Other features and advantages will be seen as . ~ CA 02053666 1998-11-06 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 i8 a sectional view taken along the line 2-2 of Fig. l; and Fig. 3 is a perspective view of another razor unit in accordance with the invention.
The shaving unit 10 shown in Fig~. 1 and 2 includes base or platform member 12 molded of high impact poly~yLene 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 of platform 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 is molded of high impact poly~yLene and has body portion 32 that defines skin engaging surface 34 that extends transversely between forwardly pro~ecting end walls 36 and ha~ a front edge 38 that is disposed rearwardly of blade edge 26. Integral rivet portions 40 extend downwardly from transversely extenA~ng body portion 32 and pass through holes in blades 20 and 24, ~r~c~ 28, and platform 12 to secure cap 30, blades 20, 24 and spacer 28 on platform 12. ~h~ively affixed to skln ~ngaging surface 34 is shaving aid composite 42.
The shaving unit 50 shown in Fig. 3 is of the type shown in JAro~cn U.S. Patent 4,586,255 and include~ body 52 with front portion 54 and rear portion 56. Resiliently secured in body S2 are guard m~mher 58, leading blade unit 60 and trailing blade unit 62. A
shaving aid composite in the form elongated insert member 64 is frictionally locked in opening 66 of rear portion 56.
The following example~ show by way of CA 02053666 l99X-11-06 illustration and not by way of limitation practice of the invention.
~mple 1 Insert members 42 and 64 are formed of a blend of 55% by weight of a water-soluble polymer (specifically a mixture of sixty weight percent Polyox Coagulant polyethylene oxide - 5,000,000 molecular weight - and forty weight percent Polyox WSN - 750 polyethylene oxide - 300,000 molecular weight), 35% by weight of water-insoluble high impact polystyrene, and 10% by weight of water-soluble polyethylene glycol (4500 molecular weight). The blend includes color dye and bactericide additives in minor amounts. The blend is extruded through an extruder with a barrel pressure of about 1800 p8i and a temperature of about 180-C. and a die pres~ure o~ about 2400 psi and a temperature o~
about 185-C. to form an extruded strip member of cross-sectional shape indicated in Figure 3. Members 64 are sliced from the extruded strip and secured in openin~S
66 of shaving units 50. A ~trip of cross-sectional ~hape indicated in Fig. 2 is similarly extruded and sliced into m~mbers 42 that are adhesively ~ecured in a recess in cap member 30. The resulting extruded members are ~turdy and have attractlve appearance, and the resulting c~rtridge~ "6-- good overall shaving p-rfor~nce.
I~er~ion of member 64 in water causes gradual relea~e Or the polyethylene oxide, the 1088 of weight of me~ber 6~ due to release of polyethylene oxide being a generally linear function of time - member 64 having about two percent weight 1088 after immersion in 20-23-C. water for thirty minute~ and about tw_l.Ly percent weight 108a after immersion in 20-23-C. water ~or two h~d~d ten minute~ (the weight 1088 in each instancQ
being measured after the member 64 ha~ been dried in the air at 50'C. for tw~,-Ly-four hours).
. - CA 02053666 1998-11-06 le 2 Insert members 64 are formed of a blend of 60%
by weight of a water-soluble polymer (specifically a mixture of sixty weight percent Polyox Coagulant 5 polyethylene oxide - 5,000,000 molecular weight - and forty weight percent Polyox WSN - 750 polyethylene oxide - 3ao,000 molecular weight), 35% by weight of water-insoluble high impact poly~tyrene, and 5% by weight of water-soluble polyethylene glycol (8,000 molecular weight). The blend includes color dye and bactericide additives in minor amounts. The blend is extruded through an extruder with a barrel pressure of about 1800 psi and a temperature of about 180'C. and a die pressure of about 2400 p8i and a temperature of about 185 C. to form an extruded strip member of cross-sectional ~hape indicated in Figure 3. Members 64 are sliced from the extruded strip and secured in openings 66 of shaving units 50. The rQsulting extruded mQmbers are sturdy and have attractive app~arance, and the resulting cartridges poQ~Qr~ good overall shaving performance.
ample 3 Insert member~ 64 are formed of a blend of 55 by weight of a water-soluble polymer (specifically a mixture of ~ixty weight percent Polyox Coagulant polyethylene oxide - 5,000,000 mole~lAr weight - and forty weight percent Polyox WSN - 750 polyethylene oxide - 300,000 molecular weight), 35% by weight of water-in~olubl- high impact poly~tyren-, and 10% by weight of water-~oluble polyethylene glycol (20,000 mols~lAr weight). The blend includes color dye and bactericide additives in minor amount~. The blend is extruded through an extruder with a barrel pr~r~re of about 1800 psi and a temperature of about 180'C. and a die p~F~-~lre of about 2400 psi and a temperature of about 185-C. to 3S for~ an extruded strip member of cross-sectional shape indicated in Figure 3. Me~bers 64 are sliced ~rom the extruded strip and ~ecured in openings 66 o~ ~having units 50. The resulting extruded members are sturdy and have attractive appearance, and the resulting cartridges pOc~?cc good overall shaving performance.
Exam~le 4 Insert members 64 are formed of a blend of 60%
by 10 weight of a water-soluble polymer (specifically a mixture of sixty weight percent Polyox Coagulant polyethylene oxide - 5,000,000 molecular weight - and forty weight percent Polyox WSN - 750 polyethylene oxide 10 - 300,000 molecular weight), 30% by weight of water-insoluble high impact polystyrene, and 10% by weight of water-soluble polyethylene glycol (4500 molecular weight). The blend includes color dye and bactericide additives in minor amounts. The blend is extruded through an extruder with a barrel pre sure of about 1800 psi and a temperature of about 180-C. and a die pressure of about 2400 p8i and a temperature of about 185-C. to form an extruded strip member of cross-sectional shape indicated in Figure 3. MQmbQrs 64 ar~ sliced from the extruded strip and securQd in openings 66 of shaving units 50. ThQ resulting extruded ~ ~bers are sturdy and have attractive appearance, and the resulting cartridges r~ good overall shaving perfor~ance.
This invention relates to shaving systems, and more particularly to shaving systems of the wet shave type.
In shaving systems of the wet shave type, factors such as the frictional drag of the razor across the skin, the force needed to sever hairs, and irritation of preexisting skin damage can create a degree of shaving discomfort. Discomfort, and other problems accompanying wet shaving systems, can be alleviated by the application of shaving aids to the skin. Shaving aids may be applied prior to, during, or after shaving. A number of problems accompany the use of pre- and post-applied shaving aids. Pre-applied-shaving aids can evaporate or can be carried away fromthe site of application by repeated strokes of the razor. Post-applied-shaving aids are not present on the ~kin during shaving and thus their application may be to late to prevent an unwan~ed affect. Both pre-applied and post-applied shaving aids add additional steps to the shaving process.
~ Lv~0-~18 have been made to incorporate a shaving aid e.g., lubricant, w~ker softener, razor cle~n~er, medicinal agent, cosmetic agent or combination thereof, into a razor, e.g., by depositing a shaving aid in a ~ on the razor, by incorporating a shaving aid directly into one or more molded polymeric components of the razor, by adhesively securing a shaving aid composite to the razor, and by use of a mechanical 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 material, e.g., a polystyrene polymer, to form an insoluble polymer/soluble shaving aid composite. The composite has been mounted on razor and shaving cartridge structures, ad~acent the shaving edge or edges, of single or multiple blade shaving system. Upon exposure to water, the water-soluble shaving aid leaches from the composite onto the skin.
Extruded composites with relatively large amounts of shaving agent material (up to 80% by weight) and relatively low amounts of water insoluble matrix material tas little as 20% by weight) are relatively weak and have a ten~ncy towards mQch~nical failure, both in assembly and in use. Increase in mechanical strength can be obt~ n~~ with increased amounts of the matrix material. However, such increase reduces the releasability of the shaving material.
In accordance with one aspect of the invention, there i~ provided a shaving unit that comprises at least one blade and a shaving composite that has a surfacQ for engaging the user's skin adjacent the blade edge. The Qhaving unit may be of a 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 i~ rded as a unit when the blade or bladea become dulled. The blade edge ~or edges) cooperate with skin engaging surfaces to define shaving geometry. The shaving aid compoQite is a mixture of water insoluble matrix material, an effective amount of shaving aid material, and a water soluble low molecular weight releasQ enhancing agent that ~h~nceC
the releasability of the shaving aid material from the matrix material.
. CA 020~3666 1998-11-06 Preferably, the composite includes 20-60 percent by weight of the water-insoluble matrix material, 20-75 percent by weight of the shaving aid material, and 5-20 percent by weight of the release enhancing agent. Suitable water-insoluble matrix materials include, for example, polyethylene, poly~ropylene, polystyrene and polyacetyl. Suitable release-enhancing agents include, for example, polyethylene glycol, methoxypolyethylene glycol, lo methylcellulose, and carboxypolymethylene. Suitable shaving aid materials include, for example, polyethylene oxide, polyvinyl pyrrolidone, polyacrylamide, hydroxypropyl cellulose, polyvinyl imidazonline, polyhydroxyethylmethacrylate, silicone copolymers, sucrose stearate, vitamin E, panthenol, aloe and essential oils such as menthol.
In particular embodiments, the shaving agent composite i~ a member of extrusion-oriented blend of polymeric materials that contains water-soluble and water-insoluble materials, the nature and relative proportion~ of the water-soluble and water-insoluble polymeric matQrials being such that the member has adequate me~h~cal strength, both as initially produced and after a signi~icant amount of the water-soluble 2S material has been leached out, the quantity of the watQr-solublQ material being sufficient to provide ef~ective ~having a~sistance, such a~ lubrication, for the entire expected life of the blade or blades.
Preferably, the molecular weight of the release s~hA~cing agent is less than five percent of the average molecular we~ght of the shaving aid material.
In a particular embodiment, the release-Pnh~cing agent is polyethylene glycol of about 4,500 molecular weight and the shaving aid material is polyethylene oxide of at least about one million molecular weight.
Other features and advantages will be seen as . ~ CA 02053666 1998-11-06 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 i8 a sectional view taken along the line 2-2 of Fig. l; and Fig. 3 is a perspective view of another razor unit in accordance with the invention.
The shaving unit 10 shown in Fig~. 1 and 2 includes base or platform member 12 molded of high impact poly~yLene 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 of platform 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 is molded of high impact poly~yLene and has body portion 32 that defines skin engaging surface 34 that extends transversely between forwardly pro~ecting end walls 36 and ha~ a front edge 38 that is disposed rearwardly of blade edge 26. Integral rivet portions 40 extend downwardly from transversely extenA~ng body portion 32 and pass through holes in blades 20 and 24, ~r~c~ 28, and platform 12 to secure cap 30, blades 20, 24 and spacer 28 on platform 12. ~h~ively affixed to skln ~ngaging surface 34 is shaving aid composite 42.
The shaving unit 50 shown in Fig. 3 is of the type shown in JAro~cn U.S. Patent 4,586,255 and include~ body 52 with front portion 54 and rear portion 56. Resiliently secured in body S2 are guard m~mher 58, leading blade unit 60 and trailing blade unit 62. A
shaving aid composite in the form elongated insert member 64 is frictionally locked in opening 66 of rear portion 56.
The following example~ show by way of CA 02053666 l99X-11-06 illustration and not by way of limitation practice of the invention.
~mple 1 Insert members 42 and 64 are formed of a blend of 55% by weight of a water-soluble polymer (specifically a mixture of sixty weight percent Polyox Coagulant polyethylene oxide - 5,000,000 molecular weight - and forty weight percent Polyox WSN - 750 polyethylene oxide - 300,000 molecular weight), 35% by weight of water-insoluble high impact polystyrene, and 10% by weight of water-soluble polyethylene glycol (4500 molecular weight). The blend includes color dye and bactericide additives in minor amounts. The blend is extruded through an extruder with a barrel pressure of about 1800 p8i and a temperature of about 180-C. and a die pres~ure o~ about 2400 psi and a temperature o~
about 185-C. to form an extruded strip member of cross-sectional shape indicated in Figure 3. Members 64 are sliced from the extruded strip and secured in openin~S
66 of shaving units 50. A ~trip of cross-sectional ~hape indicated in Fig. 2 is similarly extruded and sliced into m~mbers 42 that are adhesively ~ecured in a recess in cap member 30. The resulting extruded members are ~turdy and have attractlve appearance, and the resulting c~rtridge~ "6-- good overall shaving p-rfor~nce.
I~er~ion of member 64 in water causes gradual relea~e Or the polyethylene oxide, the 1088 of weight of me~ber 6~ due to release of polyethylene oxide being a generally linear function of time - member 64 having about two percent weight 1088 after immersion in 20-23-C. water for thirty minute~ and about tw_l.Ly percent weight 108a after immersion in 20-23-C. water ~or two h~d~d ten minute~ (the weight 1088 in each instancQ
being measured after the member 64 ha~ been dried in the air at 50'C. for tw~,-Ly-four hours).
. - CA 02053666 1998-11-06 le 2 Insert members 64 are formed of a blend of 60%
by weight of a water-soluble polymer (specifically a mixture of sixty weight percent Polyox Coagulant 5 polyethylene oxide - 5,000,000 molecular weight - and forty weight percent Polyox WSN - 750 polyethylene oxide - 3ao,000 molecular weight), 35% by weight of water-insoluble high impact poly~tyrene, and 5% by weight of water-soluble polyethylene glycol (8,000 molecular weight). The blend includes color dye and bactericide additives in minor amounts. The blend is extruded through an extruder with a barrel pressure of about 1800 psi and a temperature of about 180'C. and a die pressure of about 2400 p8i and a temperature of about 185 C. to form an extruded strip member of cross-sectional ~hape indicated in Figure 3. Members 64 are sliced from the extruded strip and secured in openings 66 of shaving units 50. The rQsulting extruded mQmbers are sturdy and have attractive app~arance, and the resulting cartridges poQ~Qr~ good overall shaving performance.
ample 3 Insert member~ 64 are formed of a blend of 55 by weight of a water-soluble polymer (specifically a mixture of ~ixty weight percent Polyox Coagulant polyethylene oxide - 5,000,000 mole~lAr weight - and forty weight percent Polyox WSN - 750 polyethylene oxide - 300,000 molecular weight), 35% by weight of water-in~olubl- high impact poly~tyren-, and 10% by weight of water-~oluble polyethylene glycol (20,000 mols~lAr weight). The blend includes color dye and bactericide additives in minor amount~. The blend is extruded through an extruder with a barrel pr~r~re of about 1800 psi and a temperature of about 180'C. and a die p~F~-~lre of about 2400 psi and a temperature of about 185-C. to 3S for~ an extruded strip member of cross-sectional shape indicated in Figure 3. Me~bers 64 are sliced ~rom the extruded strip and ~ecured in openings 66 o~ ~having units 50. The resulting extruded members are sturdy and have attractive appearance, and the resulting cartridges pOc~?cc good overall shaving performance.
Exam~le 4 Insert members 64 are formed of a blend of 60%
by 10 weight of a water-soluble polymer (specifically a mixture of sixty weight percent Polyox Coagulant polyethylene oxide - 5,000,000 molecular weight - and forty weight percent Polyox WSN - 750 polyethylene oxide 10 - 300,000 molecular weight), 30% by weight of water-insoluble high impact polystyrene, and 10% by weight of water-soluble polyethylene glycol (4500 molecular weight). The blend includes color dye and bactericide additives in minor amounts. The blend is extruded through an extruder with a barrel pre sure of about 1800 psi and a temperature of about 180-C. and a die pressure of about 2400 p8i and a temperature of about 185-C. to form an extruded strip member of cross-sectional shape indicated in Figure 3. MQmbQrs 64 ar~ sliced from the extruded strip and securQd in openings 66 of shaving units 50. ThQ resulting extruded ~ ~bers are sturdy and have attractive appearance, and the resulting cartridges r~ good overall shaving perfor~ance.
Claims (9)
PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A shaving system of the wet shave type comprising at least one blade member (20,24), and structure (16,32) defining an external skin engaging portion (18,34) adjacent the shaving edge of the said blade member (20,24), wherein said skin engaging portion (34) includes a water-insoluble polymer and a water-soluble polymer, whereby said skin engaging portion (34) includes a shaving aid composite (42) of extrusion-oriented material that includes a matrix of water-insoluble polymeric material consisting of one or more of polyethylene, polypropylene, polystyrene, and polyacetyl;
an effective amount of a water-leachable shaving aid material consisting of one or more of polyethylene oxide, polyvinyl pyrrolidone, polyacrylamide, hydroxypropyl cellulose, polyvinyl imidazonline, polyhydroxyethylmethacrylate, silicone polymers, sucrose stearate, vitamin E, panthenol, aloe, and essential oils;
and a low molecular weight release-enhancing agent consisting of one or more of polyethylene glycol, methoxypolyethylene glycol, methylcellulose, and carboxypolymethylene, wherein said shaving aid composite (42) comprises 20-60% by weight of said matrix material, 20-75% by weight of said water-leachable shaving aid material, and 5-20%~ by weight of said release-enhancing agent.
an effective amount of a water-leachable shaving aid material consisting of one or more of polyethylene oxide, polyvinyl pyrrolidone, polyacrylamide, hydroxypropyl cellulose, polyvinyl imidazonline, polyhydroxyethylmethacrylate, silicone polymers, sucrose stearate, vitamin E, panthenol, aloe, and essential oils;
and a low molecular weight release-enhancing agent consisting of one or more of polyethylene glycol, methoxypolyethylene glycol, methylcellulose, and carboxypolymethylene, wherein said shaving aid composite (42) comprises 20-60% by weight of said matrix material, 20-75% by weight of said water-leachable shaving aid material, and 5-20%~ by weight of said release-enhancing agent.
2. A shaving system according to claim 1, wherein the molecular weight of said release-enhancing agent is less than five percent of the average molecular weight of said shaving aid material.
3. A shaving system according to claim 1 or 2, wherein the molecular weight of said release-enhancing agent is less than about 20,000 and the molecular weight of said shaving aid material is at least about one million.
4. A shaving system according to any one of claims 1, 2 or 3, wherein said shaving aid composite (42) comprises about 35%
by weight of said matrix material, about 55% by weight of said water-leachable shaving aid material, and about 10% by weight of said release-enhancing agent.
by weight of said matrix material, about 55% by weight of said water-leachable shaving aid material, and about 10% by weight of said release-enhancing agent.
5. A shaving system according to any one of claims 1 to 4, wherein said polymeric matrix material is high impact polystyrene; said shaving aid material includes polyethylene oxide;
and said release-enhancing agent is polyethylene glycol.
and said release-enhancing agent is polyethylene glycol.
6. A shaving system according to any one of claims 1 to 5, wherein the release of said shaving aid material is a generally linear function of time over the entire expected life of the shaving system.
7. A shaving system according to any one of claims 1 to 6, comprising two blade members (20,24) that have parallel spaced transversely extending cutting edges (22,26), structure (16) defining an external skin engaging surface portion (18) forward of the cutting edges of said blade members, structure (32) defining an external skin-engaging surface (34) rearwardly of the cutting edges of said blade members, said shaving aid composite being secured to one of said skin-engaging surface portions (18,34).
8. A method for manufacturing a shaving aid composite (42) for use in a skin engaging portion (34) of a shaving system of the wet shave type, wherein a blend of a water-insoluble polymer and a water-soluble polymer is formed, with the steps of:
(a) forming a blend of a water-insoluble polymeric material consisting of one or more of polyethylene, polypropylene, polystyrene, and polyacetyl; an effective amount of a water-leachable shaving aid material consisting of one or more of polyethylene oxide, polyvinyl pyrrolidone, polyacrylamide, hydroxypropyl cellulose, polyvinyl imidazonline, polyhydroxyethylmethacrylate, silicone polymers, sucrose stearate, vitamin E, panthenol, aloe, and essential oils; and a low molecular weight release-enhancing agent consisting of polyethylene glycol, methoxypolyethylene glycol, methylcellulose or carboxypolymethylene, or mixtures thereof; and (b) extruding the blend to form an extruded strip comprising said composite (42) wherein said shaving aid composite (42) comprises 20-60% by weight of said matrix material, 20-75% by weight of said water-leachable shaving aid material, and 5-20% by weight of said release-enhancing agent.
(a) forming a blend of a water-insoluble polymeric material consisting of one or more of polyethylene, polypropylene, polystyrene, and polyacetyl; an effective amount of a water-leachable shaving aid material consisting of one or more of polyethylene oxide, polyvinyl pyrrolidone, polyacrylamide, hydroxypropyl cellulose, polyvinyl imidazonline, polyhydroxyethylmethacrylate, silicone polymers, sucrose stearate, vitamin E, panthenol, aloe, and essential oils; and a low molecular weight release-enhancing agent consisting of polyethylene glycol, methoxypolyethylene glycol, methylcellulose or carboxypolymethylene, or mixtures thereof; and (b) extruding the blend to form an extruded strip comprising said composite (42) wherein said shaving aid composite (42) comprises 20-60% by weight of said matrix material, 20-75% by weight of said water-leachable shaving aid material, and 5-20% by weight of said release-enhancing agent.
9. A shaving aid composite (42) for use in a skin engaging portion (34) of a shaving system of the wet shave type, wherein said skin engaging portion (34) includes a water-insoluble polymer and a water-soluble polymer, whereby said composite (42) comprises extrusion-oriented material comprising a matrix of water-insoluble polymeric material, consisting of one or more of polyethylene, polypropylene, polystyrene, and polyacetyl; an effective amount of a water-leachable shaving aid material, consisting of one or more of polyethylene oxide, polyvinyl pyrrolidone, polyacrylamide, hydroxypropyl cellulose, polyvinyl imidazonline, polyhydroxyethylmethacrylate, silicone polymers, sucrose stearate, vitamin E, panthenol, aloe, and essential oils; and a lower molecular weight release-enhancing agent consisting of one or more of polyethylene glycol, methoxypolyethylene glycol, methylcellulose, and carboxypolymethylene, wherein said shaving aid composite (42) comprises 20-60% by weight of said matrix material, 20-75% by weight of said water-leachable shaving aid material, and 5-20% by weight of said release-enhancing agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2053666 CA2053666C (en) | 1991-10-17 | 1991-10-17 | Shaving system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2053666 CA2053666C (en) | 1991-10-17 | 1991-10-17 | Shaving system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2053666A1 CA2053666A1 (en) | 1993-04-18 |
| CA2053666C true CA2053666C (en) | 1999-05-25 |
Family
ID=4148588
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2053666 Expired - Fee Related CA2053666C (en) | 1991-10-17 | 1991-10-17 | Shaving system |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2053666C (en) |
-
1991
- 1991-10-17 CA CA 2053666 patent/CA2053666C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CA2053666A1 (en) | 1993-04-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5113585A (en) | Shaving system | |
| EP0551407B1 (en) | Shaving system | |
| US4624051A (en) | Shaving unit | |
| EP0916459B1 (en) | Shaving system | |
| EP0715561B1 (en) | Shaving system | |
| EP0550600B1 (en) | Shaving system | |
| US6944952B1 (en) | Shaving system | |
| EP2061635B1 (en) | Wet shaving system including a mineral oil coated shaving aid | |
| US5956848A (en) | Shaving system | |
| EP0772511B1 (en) | Shaving system | |
| CA2053666C (en) | Shaving system | |
| CA2053557C (en) | Shaving system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |