US3663392A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chlorinating powdered vinyl chloride polymers
Assignee: BASF SE
•
Filing: 1970-06-18
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Granted: 1972-05-16
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Expires: 1990-06-18
Abstract
Abstract A process for the chlorination of vinyl chloride polymers in which a powdered vinyl chloride polymer is treated in a first stage with gaseous chlorine at below the softening point and under the action of light followed by a second stage in which it is treated at above the softening point while excluding light. The products are homogeneously chlorinated and have a high thermostability; they may be used as special glasses and for hot water pipes.
Inventors
- 👤 Gerhard Zeitler
- 👤 Hans-Georg Trieschmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:04
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/18; C08F8/20
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
15 words
A process as claimed in claim 1 in which a vinyl chloride homopolymer is chlorinated.
Claim 2
Dependent Claim
23 words
A process as claimed in claim 1 in which a vinyl chloride polymer having a K value of less than 75 is chlorinated.
Claim 3
Dependent Claim
25 words
A process as claimed in claim 1 in which a vinyl chloride polymer having a particle diameter of from 100 to 600 microns is chlorinated.
Claim 4
Dependent Claim
25 words
A process as claimed in claim 1 in which a vinyl chloride polymer having a particle diameter of from 200 to 400 microns is chlorinated.
Claim 5
Dependent Claim
30 words
A process as claimed in claim 1 wherein the two-stage chlorination is sufficient to provide a polymer product having a chlorine content of about 63 to 65 percent by weight.
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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |