US3317449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyvinylidene chloride latex and process
Assignee: WR Grace and Co
•
Filing: 1966-04-19
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Granted: 1967-05-02
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Expires: 1986-04-19
Abstract
No abstract record available.
Inventors
- 👤 Philip K Isaacs
- 👤 Dudley G Woodard
- 👤 Trofimow Alexei
- 👤 Donald M Wacome
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:35
CPC Classifications
C; C08; C08F; C08F14/00; C08F14/02; C08F14/04; C08F14/08; Y; Y10; Y10S; Y10S159/00; Y10S159/10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31906
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
IN THE PREPARATION OF A POLYMER LATEX WHEREIN THE POLYMER COMPRISES 80 TO 95 WEIGHT PERCENT OF VINYLIDENE CHLORIDE MONOMER AND WHEREIN THE CONSTITUENT MONOMERS ARE EMULSIFIED IN WATER IN A REACTION ZONE IN THE PRESENCE OF AN EMULSIFYING AGENT AND POLYMERIZED THROUGH THE AGENCY OF A POLYMERIZATION INTIATOR, THE IMPROVEMENT COMPRISING ADDING SAID MONOMERS AND EMULSIFYING AGENT CONTINUOUSLY TO SAID REACTION ZONE DURING THE COURSE OF THE REACTION WHILE MAINTAINING THE WEIGHT RATIO OF THE ADDED MONOMERS TO THE ADDED EMULSIFYING AGENT SUBSTANTIALLY CONSTANT AND WHILE MAINTAINING THE CONVERSION OF MONOMERS IN SAID REACTION ZONE ABOVE 80 WEIGHT PERCENT AT ANY TIME AFTER INITIATION OF THE REACTION, SAID LATEX HAVING A VISCOSITY IN THE RANGE OF 20 TO 50 CPS. (BROOKFIELD #1 SPLINDLE, 60 R.P.M. AT 25*C.) AS MEASURED AT 60 WEIGHT PERCENT SOLIDS, SAID LATEX HAVING A SOLIDS CONTENT ABOVE 55 PERCENT.
Claim 2
Dependent Claim
144 words
IN THE PREPARATION OF A POLYMER LATEX WHEREIN THE POLYMER COMPRISES 80 TO 95 WEIGHT PERCENT OF VINYLIDENE CHLORIDE MONOMER AND WHEREIN THE CONSTITUENT MONOMERS ARE EMULSIFIED IN WATER IN A REACTION ZONE IN THE PRESENCE OF AN EMULSIFYING AGENT AND POLYMERIZED THROUGH THE AGENCY OF A POLYMERIZATION INTIATOR, THE IMPROVEMENT COMPRISING ADDING SAID MONOMERS AND EMULSIFYING AGENT CONTINUOUSLY TO SAID REACTION ZONE DURING THE COURSE OF THE REACTION WHILE MAINTAINING THE WEIGHT RATIO OF THE ADDED MONOMERS TO THE ADDED EMULSIFYING AGENT SUBSTANTIALLY CONSTANT AND WHILE MAINTAINING THE CONVERSION OF MONOMERS IN SAID REACTION ZONE ABOVE 80 WEIGHT PERCENT AT ANY TIME AFTER INITIATION OF THE REACTION, SAID LATEX HAVING A VISCOSITY IN THE RANGE OF 20 TO 50 CPS. (BROOKFIELD #1 SPLINDLE, 60 R.P.M. AT 25*C.) AS MEASURED AT 60 WEIGHT PERCENT SOLIDS, SAID LATEX HAVING A SOLIDS CONTENT ABOVE 55 PERCENT.
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) | 1970-05-01 | 1970-10-31 | 1971-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-05-01 | 1974-10-31 | 1975-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-05-01 | 1978-10-31 | 1979-05-02 | $7700.00 | Window Closed / Lapsed |