Patent US2604459A successfully refreshed from Google Patents.
US2604459A
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Method of stabilizing vinyl or vinylidene chloride-containing polymers
Assignee: Dow Chemical Co
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Filing: 1950-12-04
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Granted: 1952-07-22
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Expires: 1970-12-04
Abstract
No abstract record available.
Inventors
- 👤 Erwin M Jankowiak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:45
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
THE METHOD WHICH COMPRISES WETTING A VIRGIN FORM OF A FINELY-DIVIDED POLYMERIC PRODUCT CONTAINING AT LEAST 10 PER CENT OF A MEMBER SELECTED FROM THE GROUP CONSISTING OF VINYL CHLORIDE AND VINYLIDENE CHLORIDE, WITH AN ACIDIFIED AQUEOUS SOLUTION OF A STABILIZER SELECTED FROM THE CLASS CONSISTING OF ALKALI METAL PYROPHOSPHATES, ORTHOPHOSPHATES, AND PHOSPHITES, THE SOLUTION HAVING A PH VALUE IN THE RANGE OF 3.5 TO 5, SEPARATING THE POLYMERIC PRODUCT FROM ENOUGH OF THE SOLUTION TO LEAVE IN THE PRODUCT BETWEEN 0.05 AND 2 PER CENT BY WEIGHT OF THE STABILIZER, AND DRYING THE POLYMERIC PRODUCT WHILE THE LATTER STILL CONTAINS THE SAID AMOUNT OF STABILIZER.
Claim 2
Independent Claim
106 words
THE METHOD WHICH COMPRISES WETTING A VIRGIN FORM OF A FINELY-DIVIDED POLYMERIC PRODUCT CONTAINING AT LEAST 10 PER CENT OF A MEMBER SELECTED FROM THE GROUP CONSISTING OF VINYL CHLORIDE AND VINYLIDENE CHLORIDE, WITH AN ACIDIFIED AQUEOUS SOLUTION OF A STABILIZER SELECTED FROM THE CLASS CONSISTING OF ALKALI METAL PYROPHOSPHATES, ORTHOPHOSPHATES, AND PHOSPHITES, THE SOLUTION HAVING A PH VALUE IN THE RANGE OF 3.5 TO 5, SEPARATING THE POLYMERIC PRODUCT FROM ENOUGH OF THE SOLUTION TO LEAVE IN THE PRODUCT BETWEEN 0.05 AND 2 PER CENT BY WEIGHT OF THE STABILIZER, AND DRYING THE POLYMERIC PRODUCT WHILE THE LATTER STILL CONTAINS THE SAID AMOUNT OF STABILIZER.
References Cited (Backward Citations)
US2482038A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-07-22 | 1956-01-21 | 1956-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-07-22 | 1960-01-21 | 1960-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-07-22 | 1964-01-21 | 1964-07-22 | $7700.00 | Window Closed / Lapsed |