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US3889678A Expired / Lapsed US ⏱️ 0.0 years remaining

Cellulose graft copolymer containing non-ionic and ionic polymer moieties as absorbent media in absorbent dressings

Assignee: Personal Products Co
•
Filing: 1973-12-07
•
Granted: 1975-06-17
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Expires: 1993-12-07
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Abstract

Abstract A backbone of natural or regenerated cellulose in fibrous form which has side chains of polymer moieties grafted thereto (cellulose graft copolymer) provides a novel, highly waterabsorbent, soft, non-flammable, fibrous material useful for a variety of water or aqueous fluid-absorbent products particularly body fluid absorbent dressings such as diapers, sanitary napkins, tampons, surgical sponges, and the like. The polymer side chains are made up of ionic and non-ionic polymer moieties and, on a weight basis, may amount to from about 10% to about 90% of the cellulose graft copolymer. The ionic polymer moieties comprise from about 10% to about 80% by weight of the cellulose graft copolymer, and the non-ionic polymer moieties comprise from about 0.5% to about 60% by weight of the cellulose graft copolymer.

Inventors

  • 👤 Pronoy Kumar Chatterjee
  • 👤 Jr Robert Frederick Schwenker

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-04 20:29
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/28; A61F; A61F13/00; A61F13/15; A61F13/15203; A61F2013/15284; A61F2013/15292; A61F2013/15341; A61F13/51; A61F2013/51002; A61F2013/51038; A61F2013/51042; A61F13/53; A61F2013/530007; A61F2013/530036; A61F2013/530481; A61F2013/530489; A61F2013/530496; A61F2013/530583; A61F2013/530613; Y; Y10; Y10S; Y10S604/00; Y10S604/904

Claims Analysis

Total Claims: 14
Claim 1
Independent Claim 133 words
IN AN ABSORBENT DRESSING FOR ABSORBING BODY FLUIDS THE IMPROVEMENT WHICH COMPRISES INCLUDING THEREIN AS AN ABSORBENT MEDIA, CELLULOSE GRAFT COPOLYMER IN FIBROUS FORM HAVING A BACKBONE OF CELLULOSE AND SIDE CHAINS OF POLYMER MOIETIES GRAFTED THERETO, SAID POLYMER MOIETIES BEING SELECTED FROM THE CLASS CONSISTING OF IONIC AND NONIONIC POLYMER MOIETIES AND CONSTITUTING FROM ABOUT 10% TO ABOUT 90% BY WEIGHT OF THE TOTAL WEIGHT OF THE CELLULOSE GRAFT COPOLYMER, SOME OF SAID SIDE CHAIN POLYMER MOIETIES BEING IONIC POLYMER MOIETIES AND COMPRISING FROM ABOUT 10% TO ABOUT 80% BY WEIGHT OF THE TOTAL WEIGHT OF THE CELLULOSE GRAFT COPOLYMER, AND THE OTHER OF SAID SIDE CHAIN POLYMER MOIETIES BEING NONIONIC POLYMER MOIETIES AND COMPRISING FROM ABOUT 0.5% TO ABOUT 60% BY WEIGHT OF THE TOTAL WEIGHT OF THE CELLULOSE GRAFT COPOLYMER.
Claim 2
Dependent Claim 133 words
IN AN ABSORBENT DRESSING FOR ABSORBING BODY FLUIDS THE IMPROVEMENT WHICH COMPRISES INCLUDING THEREIN AS AN ABSORBENT MEDIA, CELLULOSE GRAFT COPOLYMER IN FIBROUS FORM HAVING A BACKBONE OF CELLULOSE AND SIDE CHAINS OF POLYMER MOIETIES GRAFTED THERETO, SAID POLYMER MOIETIES BEING SELECTED FROM THE CLASS CONSISTING OF IONIC AND NONIONIC POLYMER MOIETIES AND CONSTITUTING FROM ABOUT 10% TO ABOUT 90% BY WEIGHT OF THE TOTAL WEIGHT OF THE CELLULOSE GRAFT COPOLYMER, SOME OF SAID SIDE CHAIN POLYMER MOIETIES BEING IONIC POLYMER MOIETIES AND COMPRISING FROM ABOUT 10% TO ABOUT 80% BY WEIGHT OF THE TOTAL WEIGHT OF THE CELLULOSE GRAFT COPOLYMER, AND THE OTHER OF SAID SIDE CHAIN POLYMER MOIETIES BEING NONIONIC POLYMER MOIETIES AND COMPRISING FROM ABOUT 0.5% TO ABOUT 60% BY WEIGHT OF THE TOTAL WEIGHT OF THE CELLULOSE GRAFT COPOLYMER.
Claim 3
Dependent Claim 73 words
The absorbent dressing of claim 1 wherein said polymer moieties constitute from about 60% to about 80% by weight of the total weight of the cellulose graft copolymer, said ionic polymer moieties comprising from about 20% to about 70% by weight of the total weight of the cellulose graft copolymer, and said nonionic polymer moieties comprise from about 1% to about 60% by weight of the total weight of the cellulose graft copolymer.
Claim 4
Dependent Claim 18 words
The absorbent dressing of claim 1 wherein said dressing comprises said cellulose grafted copolymer and untreated cellulose fibers.
Claim 5
Dependent Claim 14 words
The absorbent dressing of claim 1 wherein said absorbent dressing is a sanitary napkin.
Claim 6
Dependent Claim 13 words
The absorbent dressing of claim 1 wherein said absorbent dressing is a diaper.
Claim 7
Dependent Claim 13 words
The absorbent dressing of claim 1 wherein said absorbent dressing is a tampon.
Claim 8
Dependent Claim 191 words
In an absorbent dressing for absorbing body fluids the improvement which comprises including therein as an absorbent media cellulose grafted copolymer in fibrous form, said graft copolymer having a backbone of cellulose and side chains of polymer moieties grafted thereto, said polymer moieties being selected from the class consisting of ionic and nonionic polymer moieties and constituting from about 10% to about 90% by weight of the total weight of the cellulose graft copolymer, some of said side chain polymer moieties being ionic polymer moieties and comprising from about 10% to about 80% by weight of the total weight of the cellulose graft copolymer, and the other of said side chain polymer moieties being nonionic polymer moieties and comprising from about 0.5% to about 60% by weight of the total weight of the cellulose graft copolymer, said ionic polymer moieties selected from the group consisting of poly(acrylic acid), sodium poly(acrylate), poly(methacrylic acid), potassium poly(methacrylate), poly(vinyl alcohol sulfate), poly(phosphoric acid), poly(vinyl amine), poly(4-vinyl pyridine), and hydrolyzed poly(acrylonitrile), and said nonionic polymer moieties selected from the group consisting of poly(methyl methacrylate), poly(ethyl methacrylate), poly(ethyl acrylate), poly(butyl acrylate), poly(vinyl acetate), poly(styrene), poly(butadiene), and poly(isoprene).
Claim 9
Dependent Claim 191 words
In an absorbent dressing for absorbing body fluids the improvement which comprises including therein as an absorbent media cellulose grafted copolymer in fibrous form, said graft copolymer having a backbone of cellulose and side chains of polymer moieties grafted thereto, said polymer moieties being selected from the class consisting of ionic and nonionic polymer moieties and constituting from about 10% to about 90% by weight of the total weight of the cellulose graft copolymer, some of said side chain polymer moieties being ionic polymer moieties and comprising from about 10% to about 80% by weight of the total weight of the cellulose graft copolymer, and the other of said side chain polymer moieties being nonionic polymer moieties and comprising from about 0.5% to about 60% by weight of the total weight of the cellulose graft copolymer, said ionic polymer moieties selected from the group consisting of poly(acrylic acid), sodium poly(acrylate), poly(methacrylic acid), potassium poly(methacrylate), poly(vinyl alcohol sulfate), poly(phosphoric acid), poly(vinyl amine), poly(4-vinyl pyridine), and hydrolyzed poly(acrylonitrile), and said nonionic polymer moieties selected from the group consisting of poly(methyl methacrylate), poly(ethyl methacrylate), poly(ethyl acrylate), poly(butyl acrylate), poly(vinyl acetate), poly(styrene), poly(butadiene), and poly(isoprene).
Claim 10
Dependent Claim 73 words
The absorbent dressing of claim 7 wherein said polymer moieties constitute from about 60% to about 80% by weight of the total weight of the cellulose graft copolymer, said ionic polymer moieties comprising from about 20% to about 70% by weight of the total weight of the cellulose graft copolymer, and said nonionic polymer moieties comprise from about 1% to about 60% by weight of the total weight of the cellulose graft copolymer.
Claim 11
Dependent Claim 18 words
The absorbent dressing of claim 7 wherein said dressing comprises said cellulose grafted copolymer and untreated cellulose fibers.
Claim 12
Dependent Claim 14 words
The absorbent dressing of claim 7 wherein said absorbent dressing is a sanitary napkin.
Claim 13
Dependent Claim 13 words
The absorbent dressing of claim 7 wherein said absorbent dressing is a diaper.
Claim 14
Dependent Claim 13 words
The absorbent dressing of claim 7 wherein said absorbent dressing is a tampon.

References Cited (Backward Citations)

US3024207A Cited
US3094494A Cited
US3241553A Cited
US3194727A Cited
US3457198A Cited
US3607799A Cited
US3801675A Cited
US3699965A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1978-06-16 1978-12-16 1979-06-17 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1982-06-16 1982-12-16 1983-06-17 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1986-06-16 1986-12-16 1987-06-17 $7700.00 Window Closed / Lapsed

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