US3645939A
Expired / Lapsed
US
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Compatibilization of hydroxyl containing materials and thermoplastic polymers
Assignee: US Plywood Champion Papers Inc
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Filing: 1968-02-01
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Granted: 1972-02-29
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Expires: 1988-02-01
Abstract
Abstract COMPOSITES ARE PREPARED FROM A MATERIAL CONTAINING HYDROXYL GROUPS, SUCH AS CELLULOSE, STARCH, POLYVINYL ALCOHOL, SAND, METAL OR GLASS AND A THERMOPLASTIC MATERIAL CONTAINING LABILE ATOMS, SUCH AS POLYETHYLENE OR POLYVINYL CHLORIDE, BY REACTING THE MATERIALS WITH A COUPLING AGENT, SUCH AS MALEIC ANHYDRIDE, IN THE PRESENCE OF A FREE RADICAL INITIATOR. AN IMPROVED METHOD FOR INCORPORATING FILLERS OR REINFORCING AGENTS INTO THERMOPLASTIC POLYMERS IS ALSO PROVIDED BY PRECOATING THE FILLER OR REINFORCING AGENT WITH A THERMOPLASTIC MATERIAL CONTAINING LABILE ATOMS IN THE PRESENCE OF A COUPLING AGENT AND A FREE RADICAL INITIATOR.
Inventors
- 👤 Norman G Gaylord
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:58
CPC Classifications
C; C08; C08K; C08K9/00; C08K9/04; B; B32; B32B; B32B27/00; C01; C01P; C01P2004/00; C01P2004/10; C01P2004/60; C01P2004/62; C01P2004/80
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |