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US3819765A
Expired / Lapsed
US
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Graft copolymerization of alpha-monoolefin copolymer rubbers to make gum plastics
Assignee: Dow Chemical Co
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Filing: 1968-12-30
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Granted: 1974-06-25
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Expires: 1988-12-30
Abstract
Abstract A TWO-STAGE METHOD OF GRAFTING ON EPM OR EPDM RUBBER TO MAKE A TOUGH, IMPACT-RESISTANT GUM PLASTIC: (I) A PORTION ONLY OF RESIN FORMING MONOMER (E.G., STYRENE, ACRYLONITRILE) IS FIRST "PREGRAFTED" IN SOLUTION ON THE EPM OR EPDM RUBBER SPINE; (II) THE REMAINING AMOUNT OF RESIN-FORMING MONOMER IS COMBINED WITH THE LIGHTLY GRAFTED RUBBER, AND SUBJECTED TO FURTHER GRAFT POLYMERIZATION TO PRODUCE THE FINAL GUM PLASTIC. NEW GRAFT COPOLYMERS OF RESIN-FORMING MONOMERS ON ETHYLENE/PROPYLENE/5-ETHYLIDENE-2 - NORBORNENE TERPOLYMER RUBBER ARE ALSO DISCLOSED.
Inventors
- 👤 Shea F O
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:01
CPC Classifications
C; C08; C08F; C08F285/00; C08F255/00
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) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |