Patent US2840547A successfully refreshed from Google Patents.
US2840547A
Expired / Lapsed
US
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Process for preparing polycarbonamides
Assignee: EIDP Inc
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Filing: 1955-06-30
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Granted: 1958-06-24
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Expires: 1975-06-30
Abstract
No abstract record available.
Inventors
- 👤 William L Stump
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:00
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/26; C08G69/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
171 words
A PROCESS FOR THE PREPARTION OF A SYNTHETIC, LINEAR, FIBER-FORMING POLYCARBONAMIDE IN WHICH THE RECURRING CARBONAMIDE LINAGES ARE AN INTEGRAL PART OF THE POLYMER CHAIN, WHICH COMPRISES BLENDING THER SEPARATELY PREPARED MELTS OF A DIAMINE, THE NITROGENS FO WHICH ARE SUBSTITUTED WITH ACTIVE HYDROGEN, AND A DICARBOXYLIC ACID, BOTH OF WHICH BLEND COMPONENTS MELT ABOVE ROOM TEMPERATURE, IN SUCH PROPORTION THAT NEITHER COMPONENT EXCEEDS THE OTHER BY MORE THAN ABOUT 3 MOLE PERCENTAGE, MAINTAINING THE BLEND IN MOLTEN FORM TO PRODUCE A LOW MOLECULAR WEIGHT POLYMER PARTIALLY SOLUBLE IN WATER, AND THEREAFTER ADJUSTING THE PROPORTION OF THE SAID DIAMINE TO THE SAID DICARBOXYLIC ACID BY ADDITION OF ONE OF THE SAID COMPONENTS SO THAT THE PH OF AN AQUEOUS SOLUTION OF THE SAID LOW MOLECULAR WEIGHT POLYMER HAS A PREDETERMINED VALUE, AND SUCH THAT THE COMPOSITION OF THE SAID LOW MOLECULAR WEIGHT POLYMER AND THE SAID ADDED COMPONENT IS SUITABLE FOR THE PREPARATION OF A LINEAR, FIBER-FORMING POLYCARBONAMIDE, AND THEREAFTER MELT POLYMERIZING THE LOW MOLECULAR WEIGHT POLYMER TO THE FIBER-FORMING STAGE.
Claim 2
Dependent Claim
171 words
A PROCESS FOR THE PREPARTION OF A SYNTHETIC, LINEAR, FIBER-FORMING POLYCARBONAMIDE IN WHICH THE RECURRING CARBONAMIDE LINAGES ARE AN INTEGRAL PART OF THE POLYMER CHAIN, WHICH COMPRISES BLENDING THER SEPARATELY PREPARED MELTS OF A DIAMINE, THE NITROGENS FO WHICH ARE SUBSTITUTED WITH ACTIVE HYDROGEN, AND A DICARBOXYLIC ACID, BOTH OF WHICH BLEND COMPONENTS MELT ABOVE ROOM TEMPERATURE, IN SUCH PROPORTION THAT NEITHER COMPONENT EXCEEDS THE OTHER BY MORE THAN ABOUT 3 MOLE PERCENTAGE, MAINTAINING THE BLEND IN MOLTEN FORM TO PRODUCE A LOW MOLECULAR WEIGHT POLYMER PARTIALLY SOLUBLE IN WATER, AND THEREAFTER ADJUSTING THE PROPORTION OF THE SAID DIAMINE TO THE SAID DICARBOXYLIC ACID BY ADDITION OF ONE OF THE SAID COMPONENTS SO THAT THE PH OF AN AQUEOUS SOLUTION OF THE SAID LOW MOLECULAR WEIGHT POLYMER HAS A PREDETERMINED VALUE, AND SUCH THAT THE COMPOSITION OF THE SAID LOW MOLECULAR WEIGHT POLYMER AND THE SAID ADDED COMPONENT IS SUITABLE FOR THE PREPARATION OF A LINEAR, FIBER-FORMING POLYCARBONAMIDE, AND THEREAFTER MELT POLYMERIZING THE LOW MOLECULAR WEIGHT POLYMER TO THE FIBER-FORMING STAGE.
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) | 1961-06-23 | 1961-12-23 | 1962-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-23 | 1965-12-23 | 1966-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-23 | 1969-12-23 | 1970-06-24 | $7700.00 | Window Closed / Lapsed |