US4875287A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shaving articles lubricious when wet and compositions therefor
Assignee: Hydromer Inc
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Filing: 1986-11-14
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Granted: 1989-10-24
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Expires: 2006-11-14
Abstract
Abstract The present invention is a shaving article such as a shaving cartridge which includes at least one blade and a blade support having a skin-engaging portion adjacent to a shaving edge of the blade. The skin-engaging portion is provided with a hydrogel comprising a water soluble polymer bound so as to prevent dissolution whereby the coefficient of friction of the skin-engaging portion is reduced in the presence of water.
Inventors
- 👤 Walter S. Creasy
- 👤 Donald H. Lorenz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:30
CPC Classifications
B; B26; B26B; B26B21/00; B26B21/40; B26B21/44; B26B21/443; B26B21/4012
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
60 words
A shaving article comprising at least one blade, a blade support and a skin-engaging portion adjacent a shaving edge of said blade, said skin-engaging portion provided with a hydrogel comprising a water soluble polymer rendered insoluble so as to prevent dissolution of the polymer, whereby the coefficient of friction of said skin-engaging portion is reduced in the presence of water.
Claim 2
Dependent Claim
60 words
A shaving article comprising at least one blade, a blade support and a skin-engaging portion adjacent a shaving edge of said blade, said skin-engaging portion provided with a hydrogel comprising a water soluble polymer rendered insoluble so as to prevent dissolution of the polymer, whereby the coefficient of friction of said skin-engaging portion is reduced in the presence of water.
Claim 3
Dependent Claim
34 words
The shaving article of claim 1 wherein said hydrogel is provided to said skin-engaging portion as a coating having a thickness of from about 0.0005 in. to about 0.010 in. (12.5 to 250 μm).
Claim 4
Dependent Claim
83 words
The shaving article of claim 2 wherein said coating is a stable hydrophilic polymer blend which can be adhered to a surface without detaching from said surface in the presence of water during shaving, said blend comprising a first polymer component which is an organic solvent-soluble, preformed, thermoplastic polyurethane and a second high molecular weight polymer component which is hydrophilic, said blend being lubricious when wet and capable of withstanding exposure to water during shaving substantially without loss of said hydrophilic polymer component.
Claim 5
Dependent Claim
20 words
The shaving article of claim 3 wherein said polyurethane component is cross-linked during or subsequent to fabrication of the blend.
Claim 6
Dependent Claim
19 words
The shaving article of claim 3 wherein the polyurethane is derived from an aromatic polyisocyanate and a polyether polyol.
Claim 7
Dependent Claim
19 words
The shaving article of claim 3 wherein the polyurethane is derived from an aliphatic polyisocyanate and a polyether polyol.
Claim 8
Dependent Claim
19 words
The shaving article of claim 3 wherein the polyurethane is derived from an aromatic polyisocyanate and a polyester polyol.
Claim 9
Dependent Claim
19 words
The shaving article of claim 3 wherein the polyurethane is derived from an aliphatic polyisocyanate and a polyester polyol.
Claim 10
Dependent Claim
25 words
The shaving article of claim 3 wherein said hydrophilic polymer is a poly(N-vinyl lactam) having a molecular weight of from about 100,000 to about 500,000.
Claim 11
Dependent Claim
16 words
The shaving article of claim 9 wherein said poly(N-vinyl lactam) is a water soluble polyvinylpyrrolidone homopolymer.
Claim 12
Dependent Claim
15 words
The shaving article of claim 9 wherein the poly(N-vinyl lactam) is a poly(N-vinyl caprolactam) homopolymer.
Claim 13
Dependent Claim
19 words
The shaving article of claim 9 wherein the poly(N-vinyl lactam) is a copolymer with at least one other monomer.
Claim 14
Dependent Claim
42 words
The shaving article of claim 12 wherein said poly(N-vinyl lactam) component is a copolymer of at least one monomer selected from the group consisting of alphaolefin, vinyl chloride, vinylidene chloride, hydroxyethylmethacrylate, acrylic acid, methacrylic acid, vinyl acetate, vinyl alcohol and vinyl ether.
Claim 15
Dependent Claim
32 words
The shaving article of claim 2 which comprises an adhesive between said hydrogel coating and said surface of said skin-engaging portion which enhances the binding of said hydrogel to said skin-engaging portion.
Claim 16
Dependent Claim
23 words
The shaving article of claim 14 wherein said adhesive is selected from a material selected from the group consisting of acrylics and polyurethane.
Claim 17
Dependent Claim
21 words
The shaving article of claim 14 wherein said adhesive is applied as a precoating and dried before application of said hydrogel.
Claim 18
Dependent Claim
26 words
The shaving article of claim 2 wherein said hydrogel is applied as a high solids-content solution and dried on said skin-engaging portion to form said coating.
Claim 19
Dependent Claim
19 words
The shaving article of claim 17 wherein said solids content of said solution is from about 5-35% by weight.
Claim 20
Dependent Claim
16 words
The shaving article of claim 18 wherein said solids content is from about 10-25% by weight.
Claim 21
Dependent Claim
39 words
The shaving article of claim 1 wherein said hydrogel is provided to the surface of said skin-engaging portion as a film or sheet having a thickness of from about 0.0005 in. to about 0.005 in. (12.5 to 125 μm).
Claim 22
Dependent Claim
78 words
The shaving article of claim 20 wherein said film comprises a preformed stable hydrophilic polymer blend which can be adhered to said surface substantially without detaching from said surface in the presence of water during shaving comprising a first polymer component which is an organic solvent-soluble, preformed, thermoplastic polyurethane and a second high molecular weight polymer component which is hydrophilic, said blend capable of withstanding exposure to water during shaving substantially without loss of said hydrophilic polymer component.
Claim 23
Dependent Claim
28 words
The shaving article of claim 21 which further comprises an adhesive between said film or sheet and said surface of said skin-engaging portion which enhances the binding therebetween.
Claim 24
Dependent Claim
36 words
The shaving article of claim 2 wherein said hydrogel is selected from the group consisting of polymers and co-polymers of cross-linked polyacrylamide, polyhydeoxyethyl, methacrylate, polyethylene oxide, acrylic acid, gelatin, modified starches, and functional derivatives of cellulose.
Claim 25
Dependent Claim
15 words
The shaving article of claim 1 wherein said hydrogel includes one or more additional ingredients.
Claim 26
Dependent Claim
18 words
The shaving article of claim 24 wherein said additional ingredient is releasable from said hydrogel but is non-lubricating.
Claim 27
Dependent Claim
17 words
The shaving article of claim 25 wherein said releasable material is a bio-effecting or body treating material.
Claim 28
Dependent Claim
35 words
The shaving article of claim 1 wherein said hydrogel is provided to the surface of said skin-engaging portion as a coating on plastic film or fabric which is in turn adhered to said shaving article.
Claim 29
Dependent Claim
86 words
A shaving article comprising at least one blade, blade support and a skin-engaging portion adjacent a shaving edge of the blade, said skin-engaging portion provided with a hydrogel comprising a water soluble polymer rendered insoluble so as to prevent dissolution of the polymer whereby the coefficient of friction of said skin-engaging portion is reduced in the presence of water, said hydrogel provided to said skin-engaging portion as a coating having a thickness of from about 0.0005 in to about 0.010 in. (12.5 μm to 250 μm).
Claim 30
Dependent Claim
86 words
A shaving article comprising at least one blade, blade support and a skin-engaging portion adjacent a shaving edge of the blade, said skin-engaging portion provided with a hydrogel comprising a water soluble polymer rendered insoluble so as to prevent dissolution of the polymer whereby the coefficient of friction of said skin-engaging portion is reduced in the presence of water, said hydrogel provided to said skin-engaging portion as a coating having a thickness of from about 0.0005 in to about 0.010 in. (12.5 μm to 250 μm).
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USPTO Annuity & Maintenance Windows
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| 3.5 Years (Year 4) | 1992-10-23 | 1993-04-24 | 1993-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-23 | 1997-04-24 | 1997-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-23 | 2001-04-24 | 2001-10-24 | $7700.00 | Window Closed / Lapsed |