US3342754A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Para-xylylene polymers
Assignee: Union Carbide Corp
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Filing: 1966-02-18
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Granted: 1967-09-19
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Expires: 1986-02-18
Abstract
No abstract record available.
Inventors
- 👤 William F Gorham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:22
CPC Classifications
B; B05; B05D; B05D1/00; B05D1/60; C; C08; C08G; C08G61/00; C08G61/02; C08G61/025; C08G2261/00; C08G2261/30; C08G2261/34; C08G2261/342; C08G2261/3424; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/31504; Y10T428/31855; Y10T428/31935
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
132 words
A METHOD FOR THE PREPARATION OF LINEAR HOMOPOLYMERS OF P-XLYLENES COMPRISING THE STEPS OF HEATING A CYCLO-DI-P-XYLYLENE HAVING UP TO ABOUT 6 AROMATIC NUCLEAR SUBSTITUENT GROUPS SELECTED FROM THE CLASS CONSISTING OF HYDROCARBON, OXYHYDROCARBON, THIOHYDROCARBON, HYDROXYL, HALOGEN, NITRO, NITRILE, AMINE AND MERCAPTO GROUPS TO A TEMPERATURE BETWEEN ABOUT 450*C. AND 700*C. FOR A TIME SUFFICIENT TO CLEAVE SUBSTANTIALLY ALL OF THE DI-PXYLYLENE INTO VAPOROUS P-XYLYLENE DIRADICALS BUT INSUFFICIENT TO FURTHER DEGRADE THE SAID DIRADICALS AND AT A PRESSURE SUCH THAT THE PARTIAL PRESSURE OF THE VAPOROUS PXYLYLENE DIRADICALS IS BELOW ABOUT 0.75 MM. HG, AND COOLING THE VAPOROUS DIRADICALS TO A TEMPERATURE BELOW 200*C. AND BELOW THE CEILING CONDENSATION TEMPERATURE OF ONLY ONE P-XYLYLENE DIRADICAL SPECIE PRESENT IN THE PYROLYSIS VAPORS THEREBY CONDENSING SAID DIRADICAL AND FORMING A LINEAR HOMOPOLYMER OF P-XYLYLENE.
Claim 2
Independent Claim
132 words
A METHOD FOR THE PREPARATION OF LINEAR HOMOPOLYMERS OF P-XLYLENES COMPRISING THE STEPS OF HEATING A CYCLO-DI-P-XYLYLENE HAVING UP TO ABOUT 6 AROMATIC NUCLEAR SUBSTITUENT GROUPS SELECTED FROM THE CLASS CONSISTING OF HYDROCARBON, OXYHYDROCARBON, THIOHYDROCARBON, HYDROXYL, HALOGEN, NITRO, NITRILE, AMINE AND MERCAPTO GROUPS TO A TEMPERATURE BETWEEN ABOUT 450*C. AND 700*C. FOR A TIME SUFFICIENT TO CLEAVE SUBSTANTIALLY ALL OF THE DI-PXYLYLENE INTO VAPOROUS P-XYLYLENE DIRADICALS BUT INSUFFICIENT TO FURTHER DEGRADE THE SAID DIRADICALS AND AT A PRESSURE SUCH THAT THE PARTIAL PRESSURE OF THE VAPOROUS PXYLYLENE DIRADICALS IS BELOW ABOUT 0.75 MM. HG, AND COOLING THE VAPOROUS DIRADICALS TO A TEMPERATURE BELOW 200*C. AND BELOW THE CEILING CONDENSATION TEMPERATURE OF ONLY ONE P-XYLYLENE DIRADICAL SPECIE PRESENT IN THE PYROLYSIS VAPORS THEREBY CONDENSING SAID DIRADICAL AND FORMING A LINEAR HOMOPOLYMER OF P-XYLYLENE.
Claim 3
Dependent Claim
88 words
A LINEAR SOLID THERMOPLASTIC HOMO-POLYMERIZATION PRODUCT OF THE CONDENSED DIRADICALS OF THE PYROLYSIS OF A CYCLO-DI-P-XYLYLENE CONTAINING FROM ONE TO SIX AROMATIC NUCLEAR SUBSTITUENT GROUPS SELECTED FROM THE CLASS CONSISTING OF HYDROCARBON, OXYHYDROCARBON, THIOHYDROCARBON, HYDROXYL, HALOGEN, NITRO, NITRILE, AMINE AND MERCAPTO GROUPS, SAID PYROLYSIS BEING AT A TEMPERATURE BETWEEN ABOUT 450*C. AND ABOUT 700*C. AND AT A DIRADICAL PARTIAL PRESSURE BELOW ABOUT 0.75 MM. HG, SAID POLYMERIZATION PRODUCT CHARACTERIZED BY BEING FREE OF CROSS-LINKING, HAVING COMPLETE SOLVENT SOLUBILITY WITHOUT MOLECULAR DEGRADATION AND HAVING A SHARP CRYSTALLINE MELTING POINT.
Claim 4
Dependent Claim
88 words
A LINEAR SOLID THERMOPLASTIC HOMO-POLYMERIZATION PRODUCT OF THE CONDENSED DIRADICALS OF THE PYROLYSIS OF A CYCLO-DI-P-XYLYLENE CONTAINING FROM ONE TO SIX AROMATIC NUCLEAR SUBSTITUENT GROUPS SELECTED FROM THE CLASS CONSISTING OF HYDROCARBON, OXYHYDROCARBON, THIOHYDROCARBON, HYDROXYL, HALOGEN, NITRO, NITRILE, AMINE AND MERCAPTO GROUPS, SAID PYROLYSIS BEING AT A TEMPERATURE BETWEEN ABOUT 450*C. AND ABOUT 700*C. AND AT A DIRADICAL PARTIAL PRESSURE BELOW ABOUT 0.75 MM. HG, SAID POLYMERIZATION PRODUCT CHARACTERIZED BY BEING FREE OF CROSS-LINKING, HAVING COMPLETE SOLVENT SOLUBILITY WITHOUT MOLECULAR DEGRADATION AND HAVING A SHARP CRYSTALLINE MELTING POINT.
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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) | 1970-09-18 | 1971-03-20 | 1971-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-18 | 1975-03-20 | 1975-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-18 | 1979-03-20 | 1979-09-19 | $7700.00 | Window Closed / Lapsed |