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US4402937A
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US
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Preparation of PVP-iodine
Assignee: BASF SE
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Filing: 1980-09-19
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Granted: 1983-09-06
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Expires: 2000-09-19
Abstract
Abstract A process for the preparation of PVP-iodine having an iodine:iodide ratio of about 2:1 and a partition coefficient of 180-250, by reacting PVP with elementary iodine in the presence of formic acid, oxalic acid or an ammonium salt or amide of carbonic acid, formic acid or oxalic acid, in aqueous solution.
Inventors
- 👤 Walter Denzinger
- 👤 Heinrich Hartmann
- 👤 Wolfgang Schwarz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:18
CPC Classifications
A; A01; A01N; A01N59/00; A01N59/12; C; C08; C08F; C08F8/00; C08F8/18; C08F8/20; C08F8/22
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
85 words
A process for the preparation of PVP-iodine having an iodine: iodide ratio of about 2:1, a partition coefficient of 180-250 and an iodine content of from about 5 to 20% by weight based on the weight of the solids which comprises: reacting PVP having a K value of from 10 to 35 with elementary iodine in the presence of formic acid, oxalic acid or an ammonium salt or amide of carbonic acid, formic acid or oxalic acid, said reaction being carried out in aqueous solution.
Claim 2
Dependent Claim
85 words
A process for the preparation of PVP-iodine having an iodine: iodide ratio of about 2:1, a partition coefficient of 180-250 and an iodine content of from about 5 to 20% by weight based on the weight of the solids which comprises: reacting PVP having a K value of from 10 to 35 with elementary iodine in the presence of formic acid, oxalic acid or an ammonium salt or amide of carbonic acid, formic acid or oxalic acid, said reaction being carried out in aqueous solution.
Claim 3
Dependent Claim
55 words
The process of claim 1, wherein formic acid, oxalic acid or an ammonium salt or amide of carbonic acid, formic acid or oxalic acid is added to an aqueous solution of PVP containing from 10 to 60% by weight of PVP and wherein elemental iodine is added to the solution and reacted therein with PVP.
Claim 4
Dependent Claim
88 words
The process of claim 2, wherein elemental iodine is added to the PVP solution at a temperature of from about room temperature to about 50° C. and is mixed with the solution until the iodine is dissolved, and wherein the solution is then heated at from about 50° to 80° C. for a sufficient period of time to produce an iodine:iodide ratio of 2:1 and to form a PVP-iodine having an available iodine content of from 5 to 20% by weight based on the weight of the solids.
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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) | 1986-09-05 | 1987-03-07 | 1987-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-05 | 1991-03-07 | 1991-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-05 | 1995-03-07 | 1995-09-06 | $7700.00 | Window Closed / Lapsed |