# US 5,345,680 A · Shaving aid for wet razor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,345,680 A - Document ID: US5345680A - Status: Granted - Kind: A - Application number: 08/136,714 - Filed: 1993-10-13 - Granted: 1994-09-13 - Earliest claimed: 1992-02-06 - Assignees: Warner-Lambert Company - Inventors: William E. Vreeland; Robert Qubick - Web page: https://patentgrep.com/patent/US5345680A ## CPC - C08L 25/06: Polystyrene - B26B 21/443: {Lubricating strips attached to the razor head} - C08L 23/12: Polypropene - C08L 71/02: Polyalkylene oxides - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) - B26B: HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR (for harvesting A01D; for horticulture, for forestry A01G; for butchering or meat treatment A22; for manufactering or repairing footwear A43D; nail clippers or cutters A45D29/02; kitchen equipment A47J; {vegetable slicers, julienne cutters and similar devices and holders therefor, B26D3/28}; for surgical purposes A61B; for metal B23D; cutting by abrasive fluid jets B24C5/02; plier-like tools with cutting edges B25B7/22; pincers B25C11/02; handles for hand implements, in general B25G; guillotine-type cutters B26D; {perforating by non-mechanical means, e.g. by fluid jet, B26F1/26}; for erasing B43L19/00; for textile materials D06H) ## Abstract A shaving aid for use with a wet razor comprising a water insoluble polymeric material including at least two different polymers, and a water soluble active ingredient, such as polyethylene oxide. One embodiment of the present invention comprises a flexible, polypropylene razor head, having a shaving aid bonded directly thereto. The shaving aid comprises a water soluble polyethylene oxide and water-insoluble polystyrene and polypropylene. Other additives such as pigments and skin-treating additives are also disclosed. Another embodiment of the present invention comprises the shaving aid molded onto a flexible blade support which is preferably formed of polypropylene. ## Claims ### Claim 1 A shaving aid for use with a wet razor: (a) said shaving aid comprising about 15%-40% of a water-insoluble matrix wherein: (i) about 30%-70% of said water-insoluble matrix comprises a polystyrene compound; (ii) about 25%-70% of said water-insoluble matrix comprises a polypropylene compound; and (b) said shaving aid further comprises at least 50% of at least one water-soluble active ingredient. ### Claim 2 (depends on 1) A shaving aid according to claim 1 comprising about 18%-35% of said water-insoluble polymer wherein said water-insoluble polymer comprises about 40%-65% polystyrene compound and about 35%-60% polypropylene compound. ### Claim 3 (depends on 1) A shaving aid according to claim 1 comprising about 20%-25% of said water-insoluble matrix and wherein said water-insoluble matrix comprises: (a) about 50%-60% polystyrene compound; and (b) about 40%-50% polypropylene compound. ### Claim 4 (depends on 1) A shaving aid according to claim 1 wherein said active ingredient comprises polyethylene oxide. ### Claim 5 (depends on 4) A shaving aid according to claim 4 wherein said active ingredient comprises polyethylene oxide. ### Claim 6 (depends on 1) A shaving aid according to claim 1 wherein said active ingredient comprises at least 90% polyethylene oxide. ### Claim 7 (depends on 6) A shaving aid according to claim 6 wherein said active ingredient comprises at least 90% polyethylene oxide. ### Claim 8 (depends on 1) A shaving aid according to claim 1 comprising: about 10% of a polypropylene compound; about 10% of a polystyrene compound; at least 75% of a blend of high molecular weight polyethylene oxide having an average molecular weight of about 5 million and a low molecular weight polyethylene oxide having an average molecular weight of about 300,000. ### Claim 9 (depends on 8) A shaving aid according to claim 8 comprising approximately equal amounts of said high molecular weight polyethylene oxide and said low molecular weight polyethylene oxide. ### Claim 10 (depends on 8) A shaving aid according to claim 8 comprising about 10% of a polypropylene compound; about 10% of a polystyrene compound; about 20% high molecular weight polyethylene oxide having an average molecular weight of about 5 million; and about 60% of a low molecular weight polyethylene oxide having an average molecular weight of about 300,000. ### Claim 11 (depends on 8) A shaving aid according to claim 8 wherein said polystyrene compound comprises medium impact polystyrene and about 10% titanium dioxide pigment, and wherein said polypropylene compound comprises about 10% titanium dioxide pigment. ### Claim 12 (depends on 1) A shaving aid according to claim 1 comprising about 0.05-1% aloe vera. ### Claim 13 (depends on 1) A shaving aid according to claim 1 comprising at least one coloring agent. ### Claim 14 A shaving aid for use with a wet razor: (a) said shaving aid comprising about 15%-40% of a water-insoluble matrix: (i) about 30%-70% of said water-insoluble matrix comprises an ABS compound; and (ii) about 25%-70% of said water-insoluble matrix comprises a polypropylene compound; and (b) said shaving aid further comprises at least 50% of at least one water-soluble active ingredient. ### Claim 15 (depends on 14) A shaving aid according to claim 14 comprising about 18%-35% of said water-insoluble matrix and wherein said water-insoluble matrix comprises: (i) about 40%-65% ABS compound; and (ii) about 35%-60% polypropylene compound. ### Claim 16 (depends on 14) A shaving aid according to claim 14 comprising about 20%-25% of said water-insoluble matrix and wherein said water-insoluble matrix comprises: (i) about 50%-60% ABS compound; and (ii) about 40%-50% polypropylene compound. ### Claim 17 A flexible razor head comprising: a flexible blade support comprising polypropylene; a shaving aid attached to said flexible razor head: (a) said shaving aid comprising about 15%-40% of a water-insoluble matrix wherein: (i) about 30%-70% of said water-insoluble matrix comprises a polystyrene compound; and (ii) about 25%-70% of said water-insoluble matrix comprises a polypropylene compound; and (b) said shaving aid also comprising at least 50% of at least one active ingredient. ### Claim 18 (depends on 17) A flexible razor head according to claim 17 wherein said shaving aid comprises about 18%-35% of said water-insoluble matrix and wherein said water-insoluble matrix comprises: (i) about 40%-65% polystyrene compound; and (ii) about 35%-60% polypropylene compound. ### Claim 19 (depends on 18) A flexible razor head according to claim 18 wherein said shaving aid comprises about 18%-35% of said water-insoluble matrix and wherein said water-insoluble matrix comprises: (i) about 40%-65% polystyrene compound; and (ii) about 35%-60% polypropylene compound. ### Claim 20 (depends on 17) A shaving aid according to claim 17 wherein said active ingredient comprises polyethylene oxide. ### Claim 21 (depends on 17) A shaving aid according to claim 17 wherein said active ingredient comprises at least 90% polyethylene oxide. ### Claim 22 (depends on 17) A flexible razor head according to claim 17 wherein said blade support comprises at least 75% polypropylene. ### Claim 23 (depends on 17) A flexible razor head according to claim 17 wherein said blade support comprises at least 90% polypropylene. ### Claim 24 A process for insert molding a flexible razor head comprising the steps of: securely positioning at least one blade in a mold cavity; molding a flexible razor head by injecting at least one first polymer into said mold cavity; modifying said mold cavity to receive a shaving aid on said flexible razor head; and subsequently injecting a polymeric blend into said modified mold cavity wherein said polymeric blend comprises: a polypropylene compound, at least one polymer from the group consisting of an ABS compound and a polystyrene compound, and at least one water-soluble active ingredient. ### Claim 25 (depends on 24) A process according to claim 24 wherein said first polymer comprises polypropylene. ### Claim 26 (depends on 25) A process according to claim 25 wherein said water-soluble active ingredient comprises polyethylene oxide. ### Claim 27 A razor head comprising at least one blade supported by a support structure; wherein said support structure comprises a first water-insoluble polymeric material; said razor head comprising a shaving aid; said shaving aid comprising a water-insoluble matrix comprising said first water-insoluble polymeric material and a second water-insoluble material which is different from said first water-insoluble polymeric material; and said shaving aid also comprising at least one water-soluble active ingredient. ### Claim 28 (depends on 27) A razor head according to claim 27 wherein said first water-insoluble polymeric material comprises polypropylene. ### Claim 29 (depends on 28) A razor head according to claim 28 wherein said second water-insoluble polymeric material comprises polystyrene.