Patent US4069082A successfully refreshed from Google Patents.
US4069082A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the transformation of a comminuted swellable cellulose ether into an easily workable material
Assignee: Hoechst AG
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Filing: 1976-12-06
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Granted: 1978-01-17
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Expires: 1996-12-06
Abstract
Abstract This invention relates to an improvement in the process for the transformation of comminuted cellulose ether, which has been rendered at least largely water-insoluble by modification, but which is still highly swellable with water, into an easily workable material, in which process the modified cellulose ether is attached to a hydrophilic support web, the improvement comprising dispersing the modified cellulose ether in a solution of unmodified cellulose ether in an organic solvent, coating the support on at least one of its surfaces with the dispersion, and then drying.
Inventors
- 👤 Ludwig Grosse
- 👤 Hans-Werner Dorr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:14
CPC Classifications
D; D21; D21H; D21H19/00; D21H19/10; D21H19/14; D21H19/34; A; A61; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/28
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
47 words
In the process for the transformation of comminuted cellulose ether, which has been rendered at least largely water-insoluble by modification, but which is still highly swellable with water, into an easily workable material, in which process the modified cellulose ether is attached to a hydrophilic support web,
Claim 2
Dependent Claim
47 words
In the process for the transformation of comminuted cellulose ether, which has been rendered at least largely water-insoluble by modification, but which is still highly swellable with water, into an easily workable material, in which process the modified cellulose ether is attached to a hydrophilic support web,
Claim 3
Dependent Claim
35 words
the improvement comprising dispersing the modified cellulose ether in a solution of unmodified cellulose ether in an organic solvent, coating the support on at least one of its surfaces with the dispersion and then drying.
Claim 4
Dependent Claim
35 words
the improvement comprising dispersing the modified cellulose ether in a solution of unmodified cellulose ether in an organic solvent, coating the support on at least one of its surfaces with the dispersion and then drying.
Claim 5
Dependent Claim
18 words
A process according to claim 1 in which the unmodified cellulose ether is an alkyl hydroxyalky cellulose ether.
Claim 6
Dependent Claim
33 words
A process according to claim 1 in which the unmodified cellulose ether has a viscosity of about 10 to 30,000 cP in a 2 per cent by weight aqueous solution at 20° C.
Claim 7
Dependent Claim
22 words
A process according to claim 1 including coating the support with approximatey 0.5 to 50 g/m 2 of the modified cellulose ether.
Claim 8
Dependent Claim
23 words
A process according to claim 1 including using an alcohol, ketone, a chloroderivative of methane or a mixture thereof as an organic solvent.
Claim 9
Dependent Claim
14 words
A process according to claim 1 in which the support is not completely coated.
Claim 10
Dependent Claim
22 words
A process according to claim 1 in which the coated side of the support is additionally laminated with a hydrophilic material web.
Claim 11
Dependent Claim
13 words
A process according to claim 1 in which said organic solvent contains water.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-16 | 1981-07-18 | 1982-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-16 | 1985-07-18 | 1986-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-16 | 1989-07-18 | 1990-01-17 | $7700.00 | Window Closed / Lapsed |