Patent US3487233A successfully refreshed from Google Patents.
Patent US4467012A successfully refreshed from Google Patents.
US4467012A
Expired / Lapsed
US
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Composition for absorbent film and method of preparation
Assignee: VARIED INVESTMENTS Inc
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Filing: 1983-06-13
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Granted: 1984-08-21
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Expires: 2003-06-13
Abstract
Abstract An absorbent composition comprising the reaction product at elevated temperature and pressure of hydrolyzed starch polyacrylonitrile graft copolymer and a polyhydric alcohol such as glycerol in the amount of between about 3% and 20%. The resulting composition exhibits good fluid absorbency and fast wicking properties and is particularly useful in producing absorbent laminated film for use in diapers, paper towels and the like. The present invention also relates to an improved absorbent laminated film prepared with the above absorbent composition and a method for preparing such absorbent laminated film.
Inventors
- 👤 Lee C. Pedersen
- 👤 Lyle F. Elmquist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:43
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/60; A61L15/22; A61L15/24; C; C08; C08K; C08K5/00; C08K5/04; C08K5/05; C08K5/053; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31884; Y10T428/31895; Y10T428/31906; Y10T428/31935; Y10T428/31971; Y10T428/31975; Y10T428/31978; Y10T428/31986; Y10T442/00; Y10T442/20; Y10T442/2484; Y10T442/60; Y10T442/659; Y10T442/693
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
76 words
An absorbent film comprising at least one backing layer and an absorbent composition secured to said backing layer including the reaction product of hydrolyzed starch polyacrylonitrile graft copolymer and a polyhydric alcohol in which, based upon the total weight of the composition, said hydrolyzed starch polyacrylonitrile graft copolymer is present in an amount of about 80% to 97% by weight and said polyhydric alcohol is present in an amount of about 20% to 3% by weight.
Claim 2
Dependent Claim
76 words
An absorbent film comprising at least one backing layer and an absorbent composition secured to said backing layer including the reaction product of hydrolyzed starch polyacrylonitrile graft copolymer and a polyhydric alcohol in which, based upon the total weight of the composition, said hydrolyzed starch polyacrylonitrile graft copolymer is present in an amount of about 80% to 97% by weight and said polyhydric alcohol is present in an amount of about 20% to 3% by weight.
Claim 3
Dependent Claim
41 words
The absorbent film of claim 1 wherein the hydrolyzed starch polyacrylonitrile graft copolymer is present in the amount of about 90% to 97% by weight and said polyhydric alcohol is present in an amount of about 10% to 3% by weight.
Claim 4
Dependent Claim
15 words
The absorbent film of claim 2 wherein said backing layer includes a cellulosic fiber base.
Claim 5
Dependent Claim
21 words
The absorbent film of claim 2 including a second backing layer wherein said absorbent composition is disposed between said backing layers.
Claim 6
Dependent Claim
30 words
The absorbent film of claim 4 including the reaction product of said hydrolyzed starch polyacrylonitrile graft copolymer and said polyhydric alcohol at a temperature of at least about 100° F.
Claim 7
Independent Claim
98 words
A method of preparing an absorbent film comprising applying an absorbent composition to a backing layer in which said absorbent composition includes a mixture of hydrolyzed starch polyacrylonitrile graft copolymer and a polyhydric alcohol in which, based upon the total weight of the composition, said hydrolyzed starch polyacrylonitrile graft polymer is present in an amount of about 80% to 97% by weight and said polyhydric alcohol is present in an amount of about 20% to 3% by weight and exposing said backing layer and said absorbent composition to a temperature and pressure sufficient to bond the same together.
Claim 8
Independent Claim
98 words
A method of preparing an absorbent film comprising applying an absorbent composition to a backing layer in which said absorbent composition includes a mixture of hydrolyzed starch polyacrylonitrile graft copolymer and a polyhydric alcohol in which, based upon the total weight of the composition, said hydrolyzed starch polyacrylonitrile graft polymer is present in an amount of about 80% to 97% by weight and said polyhydric alcohol is present in an amount of about 20% to 3% by weight and exposing said backing layer and said absorbent composition to a temperature and pressure sufficient to bond the same together.
Claim 9
Dependent Claim
40 words
The method of claim 6 wherein the hydrolyzed starch polyacrylonitrile graft copolymer is present in the amount of about 90% to 97% by weight and said polyhydric alcohol is present in an amount of about 10% to 3% by weight.
Claim 10
Dependent Claim
24 words
The method of claim 7 wherein said backing layer and said absorbent composition are exposed to a temperature of at least about 100° F.
Claim 11
Dependent Claim
18 words
The method of claim 7 including feeding said backing layer and absorbent composition between a pair of rollers.
Claim 12
Dependent Claim
26 words
The method of claim 9 wherein said heat and pressure are applied by said pair of rollers and at least one of said rollers is heated.
Claim 13
Dependent Claim
18 words
The method of claim 9 wherein the pressure applied is at least about 50 pounds per linear inch.
Claim 14
Dependent Claim
15 words
The method of claim 11 wherein the heat applied is at least about 100° F.
Claim 15
Dependent Claim
27 words
The method of claim 12 including feeding said backing layer and absorbent composition between the rollers at a speed no greater than about 350 feet per minute.
Claim 16
Dependent Claim
15 words
The method of claim 13 wherein the heat applied is at least about 200° F.
Claim 17
Dependent Claim
16 words
The method of claim 13 wherein the heat applied is between 100° F. and 350° F.
Claim 18
Dependent Claim
16 words
The method of claim 7 including applying said absorbent composition between a pair of backing layers.
Claim 19
Dependent Claim
14 words
The method of claim 16 wherein said backing layers comprise a cellulosic fiber base.
Claim 20
Dependent Claim
38 words
The method of claim 17 including feeding said backing layers and absorbent composition between a pair of rollers at a temperature of at least 100° F. and at a pressure of at least 50 pounds per linear inch.
Claim 21
Dependent Claim
20 words
The method of claim 7 including applying said absorbent composition at the rate of about four grams per square foot.
Claim 22
Dependent Claim
15 words
The method of claim 7 wherein said absorbent composition is applied via a vibratory feeder.
References Cited (Backward Citations)
US4282121A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-08-21 | 1988-02-20 | 1988-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-21 | 1992-02-20 | 1992-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-21 | 1996-02-20 | 1996-08-21 | $7700.00 | Window Closed / Lapsed |