US3852223A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for disposing of halogen-containing plastics
Assignee: Dow Chemical Co
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Filing: 1972-07-03
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Granted: 1974-12-03
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Expires: 1992-07-03
Abstract
Abstract A process for disposing of halogen-containing plastic comprising preheating such plastic at dehydro-halogenating temperatures in the presence of a catalytic amount of a Lewis acid and recovering the halogen-containing by-products.
Inventors
- 👤 R Bohme
- 👤 R Wessling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:29
CPC Classifications
A; A62; A62D; A62D3/00; A62D3/30; A62D3/37; A62D3/34; C; C08; C08F; C08F8/00; C08F8/26; C08J; C08J11/00; C08J11/04; C08J11/10; C08J11/12; A62D2101/00; A62D2101/20; A62D2101/22; C08J2327/00; C08J2327/02; C08J2327/04; C08J2327/08; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/62
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
97 words
IN THE PROCESS OF DISPOSING OF VINYLIDENE CHLORIDE POLYMERS BY INCINERATION WHEREIN THE POLYMER IS PREHEATED TO DEHYDROGENATION TEMPERATURES THE IMPROVEMENT COMPRISING THE SEQUENTIAL STEPS OF (1) PREPARING AN ADMIXTURE OF VINYLIDENE CHLORIDE POLYMER AND CATALYTIC AMOUNTS OF A LEWSIS S.ACID, (2) DEGASSING SAID MIXTURE; (3) HEATING SAID MIXTURE UNDER VACUUM OR IN AN INERT ATMOSPHERE AT A TEMPERATURE OF AT LEAST 70*C TO PRODUCE A SUBSTANTIALLY LINEAR, SOLUBLE CONJUGATED POLYMER OF CHLOROACETYLENE AMONG OTHER CHLORINECONTAINING BY-PRODUCTS THEN (4) REMOVING SAID POLYMER BY CHLOROACETYLENE AND SAID OTHER HALOGEN-CONTAINING BY PRODUCTS BY EXTRACTION THEREOF IN AN ORGANIC SOLVENT.
Claim 2
Dependent Claim
97 words
IN THE PROCESS OF DISPOSING OF VINYLIDENE CHLORIDE POLYMERS BY INCINERATION WHEREIN THE POLYMER IS PREHEATED TO DEHYDROGENATION TEMPERATURES THE IMPROVEMENT COMPRISING THE SEQUENTIAL STEPS OF (1) PREPARING AN ADMIXTURE OF VINYLIDENE CHLORIDE POLYMER AND CATALYTIC AMOUNTS OF A LEWSIS S.ACID, (2) DEGASSING SAID MIXTURE; (3) HEATING SAID MIXTURE UNDER VACUUM OR IN AN INERT ATMOSPHERE AT A TEMPERATURE OF AT LEAST 70*C TO PRODUCE A SUBSTANTIALLY LINEAR, SOLUBLE CONJUGATED POLYMER OF CHLOROACETYLENE AMONG OTHER CHLORINECONTAINING BY-PRODUCTS THEN (4) REMOVING SAID POLYMER BY CHLOROACETYLENE AND SAID OTHER HALOGEN-CONTAINING BY PRODUCTS BY EXTRACTION THEREOF IN AN ORGANIC SOLVENT.
Claim 3
Dependent Claim
20 words
The process of claim 1 wherein said organic solvent is selected from the group consisting of toluene, tetrahydrofuran and trichlorobenzene.
Claim 4
Dependent Claim
12 words
The process of claim 2 wherein said Lewis acid is ferric chloride.
Claim 5
Dependent Claim
13 words
The process of claim 3 wherein said vinylidene chloride polymer is polyvinylidene chloride.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |