US3773699A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process employing a redox catalyst system for manufacturing linked ethylene vinyl grafted copolymer dispersions
Assignee: Wacker Chemie AG
•
Filing: 1971-12-03
•
Granted: 1973-11-20
•
Expires: 1991-12-03
Abstract
Abstract Process employing a redox catalyst system for manufacturing grafted ethylene vinyl copolymer emulsions which comprises preparing a stable uncoagulated ethylene-vinyl acetate copolymer backbone emulsion having a weight percentage ratio of ethylene constituent from 2 to 50, and reacting said backbone emulsions with a graftable olefinic unsaturated compound at a temperature of - 20 to + 60*C in the presence of a colloidally dispersed previous metal of the VIII sub-group of the periodic system and a member of the group consisting of inorganic and organic per compounds, hydrogen and hydrogen-yielding compounds.
Inventors
- 👤 E Bergmeister
- 👤 E Lieb
- 👤 H Woest
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:54
CPC Classifications
C; C08; C08F; C08F263/00; C08F263/02; C08F263/04; C08F255/00; C08F255/02; C08F255/026
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
23 words
Process according to claim 1, in which said per compound is selected from the group consisting of potassium persulfate and ammonium ferric sulphate.
Claim 2
Dependent Claim
64 words
Process according to claim 1, in which said catalyst also contains ions of metals selected from the group consisting of iron, copper, nickel, cobalt, chromium, molybdenum, vanadium and cerium, in quantities ranging from 0.01 to 10 g-atoms per g-atom of the precious metal employed, the weight percentage of said metal ions not exceeding 0.001 weight percent in relation to the olefinic unsaturated compounds employed.
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) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |