US3817896A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of stable aqueous copolymer dispersions of vinyl esters and ethylene
Assignee: Wacker Chemie AG
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Filing: 1972-03-13
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Granted: 1974-06-18
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Expires: 1992-03-13
Abstract
Abstract A PROCESS FOR THE PREPARATION OF STABLE, AQUEOUS COPOLYMER DISPERSIONS OF ETHYLENE AND VINYL ESTERS, PARTICULARLY VINYL ACETATE, CONTAINING FROM 5 TO 50% BY WEIGHT OF ETHYLENE BY EMULSION POLYMERIZATION IN THE PRESENCE OF REDOX CATALYST, PROTECTIVE COLLIODS AND/OR EMULSIFIERS, CHARACTERIZED IN THAT THE MONOMER TOGETHER WITH THE TOTAL AMOUNT OF THE REDUCING AGENT IS CHARGED TOGETHER WITH AUXILIARY AQUEOUS DISPERSION AGENTS. THEN A PEROXIDE COMPONENT IS DOSED-IN SO THAT A CONSTANT POLYMERIZATION TEMPERATURE IS MAINTAINED BETWEEN 0 AND 100* C. AND THE COOLING CAPACITY OF THE REACTION VESSEL IS UTILIZED.
Inventors
- 👤 H Wiest
- 👤 E Lieb
- 👤 E Bergmeister
- 👤 P Ludwig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:20
CPC Classifications
C; C08; C08F; C08F218/00; C08F218/02; C08F218/04; C08F10/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |