US3952347A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Biodegradable barrier film and absorbent pad utilizing same
Assignee: Personal Products Co
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Filing: 1973-12-13
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Granted: 1976-04-27
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Expires: 1993-12-13
Abstract
Abstract A biodegradable barrier film is provided which is useful as a barrier layer in absorbent pads such as sanitary napkins and diapers. The film comprises a matrix of a non-biodegradable film-forming material which is resistant to solubility in water having a biodegradable material homogeneously dispersed therein, the biodegradable material being present in said film in an amount from about 40 to about 60 weight percent based on the total weight of said biodegradable and said non-biodegradable film-forming material in said film.
Inventors
- 👤 John M. Comerford
- 👤 Chandra Kapur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:56
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/0008; C08K5/0033; A; A61; A61F; A61F13/00; A61F13/15; A61F13/15203; A61F13/15252; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/225; A61L15/32; A61L15/42; A61L15/62; C08L; C08L101/00; A61F13/15211; A61F2013/15235; A61F13/51; A61F13/514; A61F13/51401; A61F2013/51409; A61F2013/51433; A61F13/84; A61F2013/8488; Y; Y10; Y10S; Y10S260/00; Y10S260/43; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/31504; Y10T428/31971; Y10T428/31975
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
73 words
A biodegradable barrier film comprising a matrix of a non-biodegradable film-forming material which is resistant to solubility in water having a biodegradable material homogeneously dispersed therein, said biodegradable material being present in said film in an amount from about 40 to about 60 percent by weight based on the total weight of said biodegradable material and said non-biodegradable film-forming material in said film, said film resisting the passage of body discharge fluids therethrough.
Claim 2
Dependent Claim
73 words
A biodegradable barrier film comprising a matrix of a non-biodegradable film-forming material which is resistant to solubility in water having a biodegradable material homogeneously dispersed therein, said biodegradable material being present in said film in an amount from about 40 to about 60 percent by weight based on the total weight of said biodegradable material and said non-biodegradable film-forming material in said film, said film resisting the passage of body discharge fluids therethrough.
Claim 3
Dependent Claim
31 words
A biodegradable barrier film in accordance with claim 1 and also containing a plasticizer in an amount not more than 60 weight percent based on the entire weight of the film.
Claim 4
Dependent Claim
40 words
A biodegradable barrier film in accordance with claim 1 in which said biodegradable material and said non-biodegradable material are each present in amounts from about 38 to about 45 percent by weight based on the entire weight of the film.
Claim 5
Dependent Claim
16 words
A biodegradable barrier film in accordance with claim 1 wherein said biodegradable material is a carbohydrate.
Claim 6
Dependent Claim
15 words
A biodegradable barrier film in accordance with claim 4 wherein said carbohydrate is a starch.
Claim 7
Dependent Claim
15 words
A biodegradable barrier film in accordance with claim 4 wherein said carbohydrate is a dextrin.
Claim 8
Dependent Claim
16 words
A biodegradable barrier film in accordance with claim 1 wherein said biodegradable material is a protein.
Claim 9
Dependent Claim
14 words
A biodegradable barrier film in accordance with claim 6 wherein said protein is collagen.
Claim 10
Dependent Claim
19 words
A biodegradable barrier film in accordance with claim 1 wherein said non-biodegradable film-forming material is a water-insoluble polyvinyl alcohol.
Claim 11
Dependent Claim
16 words
A biodegradable barrier film in accordance with claim 1 wherein said non-biodegradable film-forming material is polyethylene.
Claim 12
Dependent Claim
80 words
A biodegradable barrier film comprising a matrix of a water-insoluble polyvinyl alcohol having homogenously dispersed therein a dextrin and a plasticizer, said dextrin being present in an amount from 40 to 60 percent by weight based on the total weight of dextrin and polyvinyl alcohol and said plasticizer being present in an amount from about 10 to about 75 percent by weight based on the entire weight of said film, said film resisting the passage of body discharge fluids therethrough.
Claim 13
Dependent Claim
80 words
A biodegradable barrier film comprising a matrix of a water-insoluble polyvinyl alcohol having homogenously dispersed therein a dextrin and a plasticizer, said dextrin being present in an amount from 40 to 60 percent by weight based on the total weight of dextrin and polyvinyl alcohol and said plasticizer being present in an amount from about 10 to about 75 percent by weight based on the entire weight of said film, said film resisting the passage of body discharge fluids therethrough.
Claim 14
Dependent Claim
32 words
In a disposable absorbent pad comprising a biodegradable absorbent filler material and a moisture barrier layer, the improvement which comprises utilizing as said barrier layer the biodegradable barrier film of claim 1.
Claim 15
Dependent Claim
22 words
The barrier film of claim 1 wherein said biodegradable material is a carbohydrate and said nonbiodegradable film forming material is polyvinyl alcohol.
References Cited (Backward Citations)
US3187747A
Cited
US3645836A
Cited
US3616797A
Cited
US3658062A
Cited
US3683917A
Cited
US3800797A
Cited
US3871037A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-04-27 | 1979-10-27 | 1980-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-27 | 1983-10-27 | 1984-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-27 | 1987-10-27 | 1988-04-27 | $7700.00 | Window Closed / Lapsed |