US4200557A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Absorbent product including grafted insolubilized cellulose ether
Assignee: Personal Products Co
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Filing: 1977-10-17
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Granted: 1980-04-29
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Expires: 1997-10-17
Abstract
Abstract An insoluble etherified cellulose graft copolymer is provided comprising etherified cellulose which is soluble in water in the absence of grafting and is chosen from the group consisting of the alkali metal salts of carboxyalkyl cellulose, sulfoalkyl cellulose and phosphonoalkyl cellulose. The etherified cellulose has grafted onto its cellulose backbone side chains of polymer moieties in sufficient quantities to render the grafted etherified cellulose insoluble. The products of this invention are used alone or mixed with other absorbent materials such as unmodified cellulose, in the manufacture of absorbent napkins, tampons, sponges and the like.
Inventors
- 👤 Pronoy K. Chatterjee
- 👤 Robert F. Schwenker, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:02
CPC Classifications
A; A61; A61F; A61F13/00; A61F13/15; A61F13/53; A61F13/20; A61F13/2002; A61F13/202; A61F13/2051; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/28; A61F13/15203; A61F2013/15284; A61F2013/15292; A61F2013/15341; A61F13/51; A61F2013/51002; A61F2013/51038; A61F2013/51042; A61F2013/530007; A61F2013/530036; A61F2013/530481; A61F2013/530489; A61F2013/530496; A61F2013/530583; A61F2013/530613
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
119 words
An improvement in an absorbent product for absorbing body fluids comprising water-insoluble, cellulose ether selected from the group consisting of carboxyalkyl cellulose, sulfoalkyl cellulose and phosphonoalkyl cellulose; said ether having a degree of substitution ranging from about 0.4 to about 1.3 average number of ether groups per anhydroglucose unit; the improvement comprising said ether having grafted onto its cellulose backbone side chains of hydrophilic polymer moieties in an amount which ranges from about 10 to about 90% by weight, based on the weight of the grafted cellulose ether and sufficient to render said grafted cellulose ether insoluble and to provide said grafted cellulose ether with an XOW in 1.5% by weight aqueous sodium chloride solution of at least 30.
Claim 2
Dependent Claim
119 words
An improvement in an absorbent product for absorbing body fluids comprising water-insoluble, cellulose ether selected from the group consisting of carboxyalkyl cellulose, sulfoalkyl cellulose and phosphonoalkyl cellulose; said ether having a degree of substitution ranging from about 0.4 to about 1.3 average number of ether groups per anhydroglucose unit; the improvement comprising said ether having grafted onto its cellulose backbone side chains of hydrophilic polymer moieties in an amount which ranges from about 10 to about 90% by weight, based on the weight of the grafted cellulose ether and sufficient to render said grafted cellulose ether insoluble and to provide said grafted cellulose ether with an XOW in 1.5% by weight aqueous sodium chloride solution of at least 30.
Claim 3
Dependent Claim
38 words
The absorbent product of claim 1 wherein the hydrophilic polymer moieties are 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).
Claim 4
Dependent Claim
14 words
The absorbent product of claim 2 wherein the hydrophilic polymer moiety comprises hydrolyzed poly(acrylonitrile).
Claim 5
Dependent Claim
20 words
The absorbent product of claim 1 wherein said chains of polymer moieties are copolymers of hydrophilic and hydrophobic polymer moieties.
Claim 6
Dependent Claim
34 words
The absorbent product of claim 4 wherein said hydrophobic polymer moieties comprise 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 7
Dependent Claim
11 words
The absorbent product of claim 1 which is a sanitary napkin.
Claim 8
Dependent Claim
11 words
The absorbent product of claim 1 which is a catamenial tampon.
Claim 9
Dependent Claim
10 words
The absorbent product of claim 1 which is a diaper.
Claim 10
Dependent Claim
105 words
An improvement in an absorbent product for absorbing body fluids comprising water-insoluble carboxyalkyl cellulose having a degree of substitution ranging from about 0.4 to about 1.3 average number of carboxyalkyl groups per anhydroglucose unit; the improvement comprising said carboxyalkyl cellulose having grafted unto its cellulos backbone side chains of hydrophilic polymer moieties in an amount which ranges from about 10° to about 90° by weight, based on the weight of the grafted carboxyalkyl cellulose and sufficient to render said grafted carboxyalkyl cellulose insoluble and to provide said grafted carboxyalkyl cellulose with an XOW in 1.5% by weight aqueous sodium chloride solution of at least 30.
Claim 11
Dependent Claim
105 words
An improvement in an absorbent product for absorbing body fluids comprising water-insoluble carboxyalkyl cellulose having a degree of substitution ranging from about 0.4 to about 1.3 average number of carboxyalkyl groups per anhydroglucose unit; the improvement comprising said carboxyalkyl cellulose having grafted unto its cellulos backbone side chains of hydrophilic polymer moieties in an amount which ranges from about 10° to about 90° by weight, based on the weight of the grafted carboxyalkyl cellulose and sufficient to render said grafted carboxyalkyl cellulose insoluble and to provide said grafted carboxyalkyl cellulose with an XOW in 1.5% by weight aqueous sodium chloride solution of at least 30.
Claim 12
Dependent Claim
38 words
The absorbent product of claim 9 wherein the hydrophilic polymer moieties are 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).
Claim 13
Dependent Claim
14 words
The absorbent product of claim 10 wherein the hydrophilic polymer moiety comprises hydrolyzed poly(acrylonitrile).
Claim 14
Dependent Claim
13 words
The absorbent product of claim 9 wherein said carboxyalkyl cellulose comprises carboxymethyl cellulose.
Claim 15
Dependent Claim
65 words
The absorbent product of claim 12 wherein said polymer moieties are present in at least the quantities defined by the relationship: ______________________________________
Degree of Sub-
stitution of
Carboxymethyl
Cellulose 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3
Minimum
Polymer
(% by weight
based on weight
of said grafted
carboxymethyl
cellulose) 0 9 12 13 14 15 17 19 21 23 27
______________________________________
Claim 16
Dependent Claim
20 words
The absorbent product of claim 9 wherein said chains of polymer moieties are copolymers of hydrophilic and hydrophobic polymer moieties.
Claim 17
Dependent Claim
35 words
The absorbent product of claim 14 wherein said hydrophobic polymer moieties comprise 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 18
Dependent Claim
11 words
The absorbent product of claim 9 which is a sanitary napkin.
Claim 19
Dependent Claim
11 words
The absorbent product of claim 9 which is a catamenial tampon.
Claim 20
Dependent Claim
10 words
The absorbent product of claim 9 which is a diaper.
References Cited (Backward Citations)
US3055369A
Cited
US3067745A
Cited
US3298979A
Cited
US3492082A
Cited
US3491039A
Cited
US3589364A
Cited
US3522158A
Cited
US4028290A
Cited
US4044766A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-04-29 | 1983-10-29 | 1984-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-29 | 1987-10-29 | 1988-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-29 | 1991-10-29 | 1992-04-29 | $7700.00 | Window Closed / Lapsed |