US2927913A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of uniform gels of water-insoluble polymeric n-vinyl-lactams
Assignee: GAF Chemicals Corp
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Filing: 1954-09-30
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Granted: 1960-03-08
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Expires: 1974-09-30
Abstract
No abstract record available.
Inventors
- 👤 Grosser Frederick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:37
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04; C08F126/00; C08F126/06; C08F226/00; C08F226/06; C08F226/10; C08F26/00; C08F26/06; C08L; C08L39/00; C08L39/04; C08L39/06; Y; Y10; Y10S; Y10S526/00; Y10S526/915
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
155 words
IN THE METHOD OF POLYMERIZING N-VINYL-A-PYRROLIDONE WHEREIN AN AQUEOUS SOLUTION OF N-VINYL-A-PYRROLIDONE IS TREATED WITH A SMALL AMOUNT OF A WATER-SOLUBLE PEROXIDE POLYMERIZATION CATALYST AND IN THE PRESENCE OF A MINOR AMOUNT OF AN ACTIVATOR SELECTED FROM THE GROUP CONSISTING OF AMMONIUM HYDROXIDE AND AMINES, THE IMPROVEMENT WHEREBY A UNIFORM GEL OF WATER-INSOLUBLE POLYMERIC N-VINYL-A-PYRROLIDONE IS OBTAINED, WHICH COMPRISES INCORPORATING A SMALL AMOUNT OF A WATER-SOLUBLE SALT OF A METAL SELECTED FROM THE GROUP CONSISTING OF CHROMIUM, MANGANESE, IRON, NICKEL AND COBALT IN AN AQUEOUS SOLUTION OF MONOMERIC N-VINYL-A-PYRROLIDONE, AND THEREAFTER ADDING TO THE THUS OBTAINED SOLUTION OF N-VINYL-A-PYRROLIDONE CONTAINING WATER-SOLUBLE METAL SALT, A SMALL AMOUNT OF A WATER-SOLUBLE PEROXIDE POLYMERIZATION CATALYST AND A MINOR AMOUNT OF AN ACTIVATOR SELECTED FROM THE GROUP CONSISTING OF AMMONIUM HYDROXIDES AND AMINES WHILE MAINTAINING THE TEMPERATURE OF THE REACTION MIXTURE IN THE RANGE OF 20-30*C. WHEREBY SAID N-VINYL-A-PYRROLIDONE IS POLYMERIZED TO A UNIFORM GEL OF WATER-INSOLUBLE POLYMERIC N-VINYL-A-PYRROLIDONE.
Claim 2
Dependent Claim
155 words
IN THE METHOD OF POLYMERIZING N-VINYL-A-PYRROLIDONE WHEREIN AN AQUEOUS SOLUTION OF N-VINYL-A-PYRROLIDONE IS TREATED WITH A SMALL AMOUNT OF A WATER-SOLUBLE PEROXIDE POLYMERIZATION CATALYST AND IN THE PRESENCE OF A MINOR AMOUNT OF AN ACTIVATOR SELECTED FROM THE GROUP CONSISTING OF AMMONIUM HYDROXIDE AND AMINES, THE IMPROVEMENT WHEREBY A UNIFORM GEL OF WATER-INSOLUBLE POLYMERIC N-VINYL-A-PYRROLIDONE IS OBTAINED, WHICH COMPRISES INCORPORATING A SMALL AMOUNT OF A WATER-SOLUBLE SALT OF A METAL SELECTED FROM THE GROUP CONSISTING OF CHROMIUM, MANGANESE, IRON, NICKEL AND COBALT IN AN AQUEOUS SOLUTION OF MONOMERIC N-VINYL-A-PYRROLIDONE, AND THEREAFTER ADDING TO THE THUS OBTAINED SOLUTION OF N-VINYL-A-PYRROLIDONE CONTAINING WATER-SOLUBLE METAL SALT, A SMALL AMOUNT OF A WATER-SOLUBLE PEROXIDE POLYMERIZATION CATALYST AND A MINOR AMOUNT OF AN ACTIVATOR SELECTED FROM THE GROUP CONSISTING OF AMMONIUM HYDROXIDES AND AMINES WHILE MAINTAINING THE TEMPERATURE OF THE REACTION MIXTURE IN THE RANGE OF 20-30*C. WHEREBY SAID N-VINYL-A-PYRROLIDONE IS POLYMERIZED TO A UNIFORM GEL OF WATER-INSOLUBLE POLYMERIC N-VINYL-A-PYRROLIDONE.
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) | 1963-03-08 | 1963-09-07 | 1964-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-08 | 1967-09-07 | 1968-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-08 | 1971-09-07 | 1972-03-08 | $7700.00 | Window Closed / Lapsed |