Patent US2529037A successfully refreshed from Google Patents.
US3607799A
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Processes for grafting vinyl-type compounds to cellulosic materials
Assignee: Eastman Kodak Co
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Filing: 1969-10-24
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Granted: 1971-09-21
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Expires: 1989-10-24
Abstract
Abstract It has been found that the age of ceric ion/nitric acid redox catalysts has a significant effect on the degree of reactivity of vinyl compounds (such as, for example, acrylonitrile) with cellulosic materials. Whereas, the catalyst complex apparently loses its efficacy with the passage of time, it has been found that by aging the catalyst complex for a period of at least several hours after it is initially prepared (before the catalyst complex is added to the other reactant), a very high degree of catalyst stability, catalyst predictability and catalyst efficacy results.
Inventors
- 👤 Herbert S Barbehenn
- 👤 Gerald M Leszyk
- 👤 Edward D Morrison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:35
CPC Classifications
C; C08; C08F; C08F251/00; C08F251/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
50 words
An improved process as in claim 1, wherein the amount of said ceric ion-nitric acid redox catalyst is sufficient to provide in said grafting blend a concentration of cerate ions equal to at least about 0.001 molar, and a concentration of nitrate ions equal to at least about 0.01 molar.
Claim 2
Dependent Claim
29 words
An improved process as in claim 2, wherein said ceric ion-nitric acid redox catalyst has been aged for at least about 5 hours before said grafting blend is prepared.
Claim 3
Dependent Claim
18 words
An improved process as in claim 3, wherein said cellulosic material contains at least about 1 percent hydroxyl.
Claim 4
Dependent Claim
46 words
An improved process as in claim 4, wherein said vinyl-type compound is selected from the group consisting of acrylonitrile, methyl methacrylate, methyl acrylate, ethyl acrylate, ethyl methacrylate, vinyl benzene, divinyl benzene, butyl methacrylate, butyl acrylate, vinyl acetate, acrylic acid, acrylamide and Alpha -chloroacrylonitrile and mixtures thereof.
Claim 5
Dependent Claim
30 words
An improved process as in claim 2, wherein the weight ratio of said vinyl compound to said cellulosic material in said grafting blend is at least about 0.1 to 5.
Claim 6
Dependent Claim
32 words
An improved process as in claim 2, wherein said cellulosic material, water, and said ceric ion-nitric acid redox catalyst are blended together before said vinyl-type compound is intermixed with said cellulosic material.
Claim 7
Dependent Claim
32 words
An improved process as in claim 2, wherein a mixture of said cellulosic material, water and said vinyl-type compound is formed before said ceric ion-nitric acid catalyst is blended into said mixture.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |