US2987510A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of polyvinyl chloride
Assignee: Hoechst AG
•
Filing: 1958-02-14
•
Granted: 1961-06-06
•
Expires: 1978-02-14
Abstract
No abstract record available.
Inventors
- 👤 Lederer Michael
- 👤 Frey Hans-Helmut
- 👤 Reeber Rudolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:09
CPC Classifications
C; C08; C08F; C08F14/00; C08F14/02; C08F14/04; C08F14/06; Y; Y10; Y10S; Y10S526/00; Y10S526/91
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
A PROCESS FOR THE MANUFACTURE OF HOMOPOLYMER OF VINYL CHLORIDE WITH A HIGH CONVERSION RATE, WHICH PROCESS COMPRISES ADDING TO AN AQUEOUS SUSPENSION OF VINYL CHLORIDE, IN THE PRESENCE OF A WATER SOLUBLE SUSPENSION STABILIZER SELECTED FROM THE GROUP CONSISTING ESSENTIALLY OF GELATINE, METHYL CELLULOSE, POLYVINYL ALCOHOL, AND MIXTURES THEREOF, 0.01-1 PERCENT, BASED ON THE VINYL CHLORIDE MONOMER PRESENT, OF A MONOESTER OF GLYCEROL AND A NONCONJUGATED OLEFINICALLY UNSATURATED FATTY ACID CONTAINING 12-20 CARBON ATOMS, SAID SUSPENSION AGENT AND SAID MONOESTER BEING THE SOLE DISPERSANTS PRESENT IN THE SUSPENSION, AND THEN HOMOPOLYMERIZING SAID VINYL CHLORIDE.
Claim 2
Dependent Claim
95 words
A PROCESS FOR THE MANUFACTURE OF HOMOPOLYMER OF VINYL CHLORIDE WITH A HIGH CONVERSION RATE, WHICH PROCESS COMPRISES ADDING TO AN AQUEOUS SUSPENSION OF VINYL CHLORIDE, IN THE PRESENCE OF A WATER SOLUBLE SUSPENSION STABILIZER SELECTED FROM THE GROUP CONSISTING ESSENTIALLY OF GELATINE, METHYL CELLULOSE, POLYVINYL ALCOHOL, AND MIXTURES THEREOF, 0.01-1 PERCENT, BASED ON THE VINYL CHLORIDE MONOMER PRESENT, OF A MONOESTER OF GLYCEROL AND A NONCONJUGATED OLEFINICALLY UNSATURATED FATTY ACID CONTAINING 12-20 CARBON ATOMS, SAID SUSPENSION AGENT AND SAID MONOESTER BEING THE SOLE DISPERSANTS PRESENT IN THE SUSPENSION, AND THEN HOMOPOLYMERIZING SAID VINYL CHLORIDE.
References Cited (Backward Citations)
US2528469A
Cited
US2840549A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-05 | 1964-12-05 | 1965-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-05 | 1968-12-05 | 1969-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-05 | 1972-12-05 | 1973-06-06 | $7700.00 | Window Closed / Lapsed |