US3770706A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface sulfonation epoxidation of organic polymers
Assignee: Dow Chemical Co
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Filing: 1971-09-13
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Granted: 1973-11-06
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Expires: 1991-09-13
Abstract
Abstract ORGANIC POLYMERS SUCH AS POLYETHYLENE, POLYSTYRENE AND POLYPROPYLENE ARE RENDERED ADHESIVE, ANTISTATIC AND HIGHLY IMPERMEABLE TO OLEPHILIC MATERIALS AND LOW MOLECULAR WEIGHT GASES SUCH AS OXYGEN AND CARBON DIOXIDE BY INITIALLY SURFACE SULFONATING THE ORGANIC POLYMER AND SUBSEQUENTLY REACTING THE SUBSTITUENT SULFONIC ACID GROUPS WITH ALKYLENE OXIDE OR SIMILAR EPOXIDE TO FORM THE CORRESPONDING ESTER OF SULFONIC ACID.
Inventors
- 👤 W Walles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:34
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/12
Claims Analysis
Total Claims: 0
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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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |