Auxiliary agent for shaving and method of obtaining same

The invention relates to a shaving aid and a method for making the shaving aid, in particular for wet shaving.

During wet shaving, factors such as friction resistance, the force needed to cut hair, and irritation of previous skin damage can cause discomfort.

It is known to alleviate the discomfort of wet shaving by applying shaving aids to the skin.

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Shaving aids are known for use before, during or after shaving. A significant amount of inconvenience accompanies the use of before and after shave shaving aids. Shaving aids used before shaving may evaporate or be moved off the shaving site. After shaving aids do not appear on the skin during shaving, and therefore their use may be delayed to protect the skin from unwanted shaving-related ailments. Both shaving aids used before and after shaving require additional shaving operations.

It is known to include a shaving aid such as a lubricant, beard softener, blade cleaner, medicament, cosmetic or combination thereof into the razor blade, for example by placing the shaving aid directly into one or more molded polymer components. from which the razor blade is manufactured by adhering the shaving aid to the blade and using a mechanical connection between the shaving aid composite and the blade. In this case, the water-soluble shaving aid material, e.g., polyethylene oxide, is mixed with the water-insoluble material, e.g., polystyrene, to form an insoluble polymer / soluble shaving aid composite.

From US Patent No. 4,624,051 a shaving aid is known consisting of a polymeric material one soluble and one insoluble in water, the water soluble component is selected from the group consisting of materials such as polyethylene oxide, polyvinyl oxide, pyrrolidone, polyacrylamide, among others. The water insoluble component is selected from the group consisting of polyethylene, polypropylene, polystyrene, and polyacetal. The amount of water-soluble component is at least 50% by weight. In addition, the mixture contains additives such as dyes, bactericides and stabilizers.

U.S. Patent No. 4,850, 106 discloses a lubricating strip made of injection molding of a honeycomb structure made of polystyrene and a high molecular weight water washable polyethylene oxide with the addition of a plasticizing agent enabling the use of a lower flow temperature of polyethylene oxide and being one material selected from the group consisting of, for example polyethylene glycol, polypropylene glycol or glycerol. After exposure to water, the water-soluble shaving aid component is rinsed onto the skin. Extruded composites with a relatively significant amount of shaving material (up to 80% by weight) and a relatively small amount of insoluble matrix material (as little as 20% by weight) are relatively weak and tend to mechanical damage both during assembly and use. An increase in mechanical strength can be obtained by increasing the amount of matrix material. However, such an increase reduces the releasing ability of the shaving aid material.

The object of the present invention is to provide a shaving aid extruded and having high mechanical strength and a high water-soluble release capacity.

The shaving aid of the present invention comprising a matrix of water-insoluble polymeric material and water washable shaving aid is characterized by being an extruded material containing from 20 to 60% by weight of a matrix of water-insoluble polymeric material which contains at least one component such as polyethylene, polypropylene, polystyrene and polyacetyl, from 20 to 75% by weight of a water-washable shaving aid material containing at least one such component as polyethylene oxide, polyvinylpyrrolidone, polyacrylamide, hydroxypropyl cellulose, polyvinylimidazoline, poly / methacrylate hydroxyethylene, silicone polymers, sucrose stearate, vitamin E, pantherol, and aller oil and from 5 to 20% by weight of low molecular weight release-enhancer, containing at least one such component as polyethylene glycol, methoxypolethylene glycol, methyl cellulose and carboxypolymethylene.

The release-enhancing agent enhances the release ability of the shaving aid material from the matrix material.

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Preferably, the molecular weight of the release agent is less than 5% of the average molecular weight of the shaving aid material.

Preferably, the molecular weight of the releasing-boosting agent is less than about 20,000 and the molecular weight of the shaving aid material is at least about one million.

Preferably, the composition contains about 35% by weight of matrix material, about 55% by weight of the water-washable shaving aid material, and about 10% by weight of the release agent.

Preferably, the polymeric matrix material is high-impact polystyrene, the shaving aid material contains polyethylene oxide and the release-enhancer is polyethylene glycol.

Preferably, the shaving aid also includes materials such as polyaxylamide, silicone copolymers, and menthol.

Preferably, the release / booster is polyethylene glycol with a molecular weight of about 4,500 and the shaving aid material is polyethylene oxide with a molecular weight of at least about one million.

The method of producing a shaving aid according to the invention in which a water-insoluble polymeric material is mixed with a water-washable excipient material is characterized in that the polymeric material consisting of at least one component such as polyethylene, polypropylene, polystyrene and polyacetyl with washable is mixed water as an auxiliary material consisting of at least one such component as polyethylene oxide, polyvinylpyrrolidone, polyacrylamide, hydroxypropylcellulose, polyvinylimidazoline, poly / methacrylate hydroxyethylene, silicone polymers, sucrose stearate, vitamin E, Panthenol, aloe vera resin and essential oils and with the material of the release agent and booster with a low molecular weight containing at least one polyethylene glycol polyethylene glycol methanol glycol polyethylene component, , methyl cellulose, carboxypolymethylene, and then the blend is extruded at an elevated temperature to about 185 ° C and a pressure of about 16 548 kPa.

The advantage of shaving aid is that it has adequate mechanical strength, both in its initial state after manufacture and when a significant amount of water-soluble material is flushed out, and the amount of water-soluble material is sufficient to provide effective shaving support, such as: lubrication , for the total estimated lifetime of the blade or blades.

In an embodiment, the razor with the shaving aid according to the invention is shown in the drawing, in which Fig. 1 is a perspective view of the razor assembly of the invention, Fig. 2 is a cross-sectional view taken along line 2-2 of Fig. 1 and Fig. 3 - is a perspective view of another razor assembly according to the invention.

The shaving assembly 10 shown in Figs. 1 and 2 includes a base or platform 12 extruded from high impact polystyrene that includes an integrally connected groove 14 to attach to the handle of the razor and a protective structure 16 that defines a transversely extended forward surface 18 for skin contact.

A metal guide blade 20 having a sharp edge 22, a metal knee blade 24 having a sharp edge 26 and an aluminum spacer member 28 that holds the blades 20 and 24 spaced apart are arranged on the upper surface of the deck 12.

Cap member 30 is extruded from high impact polystyrene and has a body 32 that defines a skin contact surface 34 that extends transversely between the forwardly projecting protruding end walls 36 and has a leading edge 38 that is rearwardly away from edge 26.

The integral nitro parts 40 extend downwards from the transversely extending body 32 and pass through holes in the blades 20 and 24, the spacer 28 and the platform to attach the cap 30, the blades 20 and 24 and the spacer member on the platform 12.

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A shaving aid 42 is attached to skin contact surface 34.

The shaving assembly 50 shown in Fig. 3 includes a body 52 with a front portion 54 and a rear portion 56. In the body 52, a safety member 58, guide blade assembly 60 and inoperative razor assembly 62 are mounted. Shaving aid in the form of an extended insert 64 is frictionally fastened in the hole 66 of the rear portion 56.

The following examples show a shaving aid according to the invention and a method for its preparation.

Example 1. A shaving aid is made from a blend of 55% by weight of a water-soluble polymer (especially a mixture of sixty percent by weight of polyoxylene coagulant polyethylene oxide with a molecular weight of 5,000,000 and 40% by weight of polyoxylene oxide polyoxide WSN-750 with a molecular weight of 300,000) , 35% by weight of water insoluble high impact polystyrene and 10% by weight of water-soluble polyethylene glycol (molecular weight 4500). In small quantities, the mixture contains dyes and bactericidal additives. The blend is extruded through an extrusion press at a cylinder pressure of about 12 411 kPa (1800 pounds per square inch) and a temperature of about 180 ° C and at a matrix pressure of about 16 548 kPa (2400 pounds per square inch) and at a temperature of about 185 ° C and an extruded belt having the cross-sectional shape shown in Fig. 1, and then the layers are extruded into strip 64 and are secured in the holes 66 of the shaving assembly 50. The strip having the cross-sectional shape indicated in Fig. 2 is similarly extruded, the layers are cut into layers 42, which are affixed recess in the socket member 30.

The resulting extruded members are strong and have an attractive appearance, and the resulting trays perform well at shaving. The immersion of member 64 in water causes the gradual release of polyethylene oxide, and the weight loss of member 64 due to the release of polyethylene oxide is essentially a linear function over time, wherein the member 64 loses about 2% by weight after immersion in water at 20-23 ° C for 30 minutes and about 20% by weight after immersion in water at 20-23 ° C for 210 minutes (weight loss in each case is measured after the member 64 is dried in air at 50 ° C for 24 hours). .

Example. The shaving aid is made from a mixture of 60% by weight water-soluble polymer (especially from a mixture of 60% by weight polyox Coagulant polyethylene oxide with a molecular weight of 5,000,000 and 40% by weight polyoxylene polyoxide WSN-750 with a molecular weight of 300,000), 35% by weight of water-insoluble high-impact polystyrene and 5% by weight of water-soluble polyethylene glycol (molecular weight 8,000). Dyes and bactericidal additives are added to the mix in small amounts. The blend is extruded through an extrusion press at a cylinder pressure of about 12411 kPa (1800 pounds per square inch) and at a temperature of about 180 ° C and a matrix pressure of about 16548 kPa (2400 pounds per square inch) and at a temperature of about 185 ° C and is produced embossed cross-sectional tape indicated in Fig. 3. The extruded tape is cut in layers for members 64, which are secured in the holes 66 of the blade unit 50. The resulting extruded members are strong and have an attractive appearance, and the resulting trays perform well at shaving.

Example of Ili. The shaving aid is made from a blend of 55% by weight water-soluble polymer (especially from a mixture of 60% by weight polyoxylene polyox Caogulant ethylene oxide with a molecular weight of 5,000,000 and 40% by weight polyoxylene oxide polyoxide WSN-750 with a molecular weight of 300,000), 35% by weight of water-insoluble high-impact polystyrene, and 10% by weight of water-soluble polyethylene glycol (with a molecular weight of 20,000). Dyes and bdcteriocidal additives are added to the mixture in small amounts. The mix is ​​brought to the front. a bench press at οίίηίοηίϋ in a cylinder of about 12 411 kPa (1800 pounds per square inch) and at a temperature of about 180 ° c and a pressure of about 16 548 kPa (2400 pounds per square inch) and at a temperature of about 185 ° c an extruded tape is produced cross section indicated in fig.

3. The embossed is cut into layers on Czdony 64, the hearts are fixed in the holes 66

169-141 shaving unit, 50s, The resulting embossed members are strong and have an attractive appearance, and the resulting trays perform well at shaving.

Example IV The shaving aid is made from a 60% by weight water-soluble polymer blend (especially from a mixture of 60% by weight Polyox Coagulant polyethylene oxide with a molecular weight of 5,000,000 and from 40% by weight Polyox polyethylene oxide WSN-750, with a ^ ^ ^ e ^ or 3GG.C ^ C ^ 0), 30% by weight of water insoluble high impact polystyrene, and 10% by weight of water-soluble polyethylene glycol (molecular weight 4500). Dyes and bactericidal additives are added to the mix in small amounts. The blend is extruded through an extrusion press at a cylinder pressure of about 12,411 kPa (1,800 pounds per square inch) and at about 180 ° C and a matrix pressure of about 16,548 kPa (2,400 pounds per square inch) and at about 185 ° C and produces an extruded tape having the shape in cross section indicated in Fig. 3. The extruded tape is cut in layers for members 64, which are secured in the holes 66 of the shaving assembly 50. The resulting extruded members are strong and have an attractive appearance, and the resulting trays work well when shaving.

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