US4038476A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of poly-n-vinylpyrrolidone granules containing iodide
Assignee: Novartis Corp
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Filing: 1975-11-25
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Granted: 1977-07-26
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Expires: 1995-11-25
Abstract
Abstract Preparation of free-flowing granules of practically uniform composition and particle size consisting essentially of poly-N-vinylpyrrolidone and iodide (I - ) by combining with uniform thorough mixing A. a solution and/or colloidal suspension of a substance releasing iodide ions in a first solvent or solvent mixture, as well as B. a solution and/or colloidal solution and/or suspension of PVP in a second solvent or solvent mixture which possesses a surface tension different from that of the first solvent or solvent mixture, and in which PVP is at least partially soluble or wettable, and in which the substance releasing iodide ions, contained in the first solvent or solvent mixture, is insoluble or only slightly soluble; And separating and drying the granules formed.
Inventors
- 👤 Kaya Atasoy
- 👤 Karl Franz Weckwarth
- 👤 Walter Reinhardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:19
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/20; C08J3/205; C08J3/21; C08J3/215; C08F; C08F8/00; C08F8/18; C08K; C08K3/00; C08K3/16; C08K3/18; C08K3/24; C08J2339/00; C08J2339/04; C08J2339/06; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
159 words
Process for the production of free-flowing granules consisting essentially of poly-N-vinylpyrrolidone (PVP) and iodide (I - ), the granules being of practically uniform composition and particle size, which process comprises producing a. a solution or a colloidal suspension of a substance releasing iodide ions, in a first solvent or solvent mixture, as well as b. a solution or colloidal solution or suspension of PVP in a second solvent or solvent mixture which possesses a surface tension different from that of the first solvent or solvent mixture, and in which PVP is at least partially soluble or wettable, and in which the substance releasing iodide ions, contained in the first solvent or solvent mixture, is insoluble or only slightly soluble; combining the solutions or suspensions (a) and (b), with uniform thorough mixing, in small portions to thus form a mixed-phase system; continuing the thorough mixing of the multiphase mixture; and separating and drying the formed agglomerates containing PVP and iodide.
Claim 2
Dependent Claim
159 words
Process for the production of free-flowing granules consisting essentially of poly-N-vinylpyrrolidone (PVP) and iodide (I - ), the granules being of practically uniform composition and particle size, which process comprises producing a. a solution or a colloidal suspension of a substance releasing iodide ions, in a first solvent or solvent mixture, as well as b. a solution or colloidal solution or suspension of PVP in a second solvent or solvent mixture which possesses a surface tension different from that of the first solvent or solvent mixture, and in which PVP is at least partially soluble or wettable, and in which the substance releasing iodide ions, contained in the first solvent or solvent mixture, is insoluble or only slightly soluble; combining the solutions or suspensions (a) and (b), with uniform thorough mixing, in small portions to thus form a mixed-phase system; continuing the thorough mixing of the multiphase mixture; and separating and drying the formed agglomerates containing PVP and iodide.
Claim 3
Dependent Claim
34 words
Process according to claim 1 wherein the thorough mixing is effected by stirring, the manner of stirring being such that in the mixture there is essentially no occurrence of shearing forces and of turbulence.
Claim 4
Dependent Claim
13 words
Process according to claim 1 wherein the operations are performed at room temperature.
Claim 5
Dependent Claim
30 words
Process according to claim 1 wherein the employed substance releasing iodide ions is hydriodic acid, ammonium iodide or an alkali iodide, preferably sodium iodide or potassium iodide or aluminium iodide.
Claim 6
Dependent Claim
35 words
Process according to claim 1 wherein there are used, as the first solvent or solvent mixture, water, aliphatic alcohols having 1-4 carbon atoms, aliphatic ketones having 3-9 carbon atoms or alkyl acetates, or mixtures thereof.
Claim 7
Dependent Claim
33 words
Process according to claim 1 wherein there are used, as the second solvent or solvent mixture, hydrocarbons and halogenated hydrocarbons having 1-4 carbon atoms, preferably perhalogenated hydrocarbons having 1 or 2 carbon atoms.
Claim 8
Dependent Claim
22 words
Process according to claim 1 wherein there is used a first solvent or solvent mixture containing 0-20 percent by weight, of water.
Claim 9
Dependent Claim
21 words
Process according to claim 1 wherein there is used PVP having a molecular weight in the range of 5,000 - 750,000.
Claim 10
Dependent Claim
30 words
Process according to claim 1 wherein there are obtained granules having a weight ratio of PVP to iodide ions (I - ) of 0.5 : 1 to 40 : 1.
Claim 11
Dependent Claim
20 words
Process according to claim 1 wherein there are obtained granules having a particle size of 10 μ - 3 mm.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-25 | 1981-01-24 | 1981-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-25 | 1985-01-24 | 1985-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-25 | 1989-01-24 | 1989-07-26 | $7700.00 | Window Closed / Lapsed |