US4200710A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of polyvinylpyrrolidone-iodine
Assignee: BASF SE
•
Filing: 1979-04-17
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Granted: 1980-04-29
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Expires: 1999-04-17
Abstract
Abstract A process for the preparation of PVP-iodine by reacting polyvinylpyrrolidone powder with elementary iodine at from 70° to 100° C. The reaction is carried out in the presence of formic acid, oxalic acid or an ammonium salt or amide of carbonic acid, formic acid or oxalic acid. The process avoids the disadvantage of long periods of heating, which can result in degradation of the polyvinylpyrrolidone, and is particularly suitable for the preparation of a stable PVP-iodine using a low molecular weight polyvinylpyrrolidone.
Inventors
- 👤 Walter Denzinger
- 👤 Hans-Uwe Schenck
- 👤 Wolfgang Schwarz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 03:30
CPC Classifications
A; A01; A01N; A01N59/00; A01N59/12; C; C08; C08F; C08F126/00; C08F126/06; C08F126/10; C08F8/00; C08F8/18; C08F8/20; C08F8/22
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
48 words
A process for the preparation of PVP-iodine by reacting polyvinylpyrrolidone powder with elementary iodine at from 70° to 100° C., wherein the reaction is carried out in the presence of formic acid, oxalic acid or an ammonium salt or amide of carbonic acid, formic acid or oxalic acid.
Claim 2
Dependent Claim
48 words
A process for the preparation of PVP-iodine by reacting polyvinylpyrrolidone powder with elementary iodine at from 70° to 100° C., wherein the reaction is carried out in the presence of formic acid, oxalic acid or an ammonium salt or amide of carbonic acid, formic acid or oxalic acid.
Claim 3
Dependent Claim
28 words
A process as claimed in claim 1, wherein the reaction is carried out in the presence of formic acid or oxalic acid, their ammonium salts or their amides.
Claim 4
Dependent Claim
29 words
A process as claimed in claim 1, wherein the additive which accelerates the formation of iodide is added to an aqueous polyvinylpyrrolidone solution and the latter is then dried.
Claim 5
Dependent Claim
21 words
A process as claimed in claim 1, wherein a polyvinylpyrrolidone having a K value of from 10 to 35 is reacted.
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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) | 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 |