US3725375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization process
Assignee: BP Chemicals Ltd
•
Filing: 1970-05-14
•
Granted: 1973-04-03
•
Expires: 1990-05-14
Abstract
Abstract Process comprising mixing a vinyl chloride polymer latex with vinyl chloride, destroying the latex emulsifying agent which is of the acid salt type, so that the polymer particles pass into the vinyl chloride and polymerizing the latter, preferably under suspension polymerization conditions.
Inventors
- 👤 A Sturt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:16
CPC Classifications
C; C08; C08F; C08F291/00; C08F259/00; C08F259/02; C08F259/04; Y; Y10; Y10S; Y10S525/00; Y10S525/915; Y10S526/00; Y10S526/909; Y10S526/911
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
28 words
A process as claimed in claim 1 wherein the emulsifying agent is a water soluble salt of a saturated fatty acid containing from eight to 20 carbon atoms.
Claim 2
Dependent Claim
24 words
A process as claimed in claim 1, wherein the emulsifying agent is destroyed by the addition of a relatively strong acid to the system.
Claim 3
Dependent Claim
31 words
A process as claimed in claim 1 wherein the vinyl chloride polymer is polyvinyl chloride or a copolymer of vinyl chloride containing up to 20 percent by weight of copolymerizable material.
Claim 4
Dependent Claim
15 words
A process as claimed in claim 1, wherein the monomeric material consists of vinyl chloride.
Claim 5
Dependent Claim
30 words
A process as claimed in claim 1 wherein the monomeric material is polymerized under suspension polymerization conditions in the presence of the aqueous phase of the vinyl chloride polymer latex.
References Cited (Backward Citations)
US3370105A
Cited
US3436440A
Cited
GB1087390A
Cited
US3546323A
Cited
US3562359A
Cited
US3663655A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |