US2628216A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing polyamides from dinitriles and disecondary alcohols or their esters
Assignee: EIDP Inc
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Filing: 1949-01-25
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Granted: 1953-02-10
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Expires: 1969-01-25
Abstract
No abstract record available.
Inventors
- 👤 Magat Eugene Edward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:40
CPC Classifications
C; C08; C08G; C08G69/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
A PROCESS FOR PRODUCING SYNTHETIC LINEAR POLYAMIDES WHICH COMPRISES REACTING WITHIN THE TEMPERATURE RANGE OF -20* TO 80* C. AN ORGANIC DINTRILE FREE OF OTHER REACTING GROUPS WITH A SUBSTANTIALLY MOL EQUIVALENT OF A DISECONDARY COMPOUND SELECTED FROM THE GROUP CONSISTING OF DISECONDARY ALCOHOLS AND CARBOXYLIC ACID ESTERS OF DISECONDARY ALCOHOLS CONTAINING AS THE SOLE REACTING GROUPS ALCOHOL AND ESTER GROUPS, IN A SUBSTANTIALLY ANHYDROUS STRONG ACID REACTION MEDIUM, SAID ACID BEING SELECTED FROM THE GROUP CONSISTING OF DULFURIC ACID, PHOSPHORIC ACID, ALKANE SULFONIC ACID AND MIXTURES THEREOF, AND CONTINUING THE REACTION WITHIN SAID TEMPERATURE RANGE UNTIL A POLYMER OF THE DESIRED INTRINSIC VISCOSITY IS PRODUCED.
Claim 2
Dependent Claim
106 words
A PROCESS FOR PRODUCING SYNTHETIC LINEAR POLYAMIDES WHICH COMPRISES REACTING WITHIN THE TEMPERATURE RANGE OF -20* TO 80* C. AN ORGANIC DINTRILE FREE OF OTHER REACTING GROUPS WITH A SUBSTANTIALLY MOL EQUIVALENT OF A DISECONDARY COMPOUND SELECTED FROM THE GROUP CONSISTING OF DISECONDARY ALCOHOLS AND CARBOXYLIC ACID ESTERS OF DISECONDARY ALCOHOLS CONTAINING AS THE SOLE REACTING GROUPS ALCOHOL AND ESTER GROUPS, IN A SUBSTANTIALLY ANHYDROUS STRONG ACID REACTION MEDIUM, SAID ACID BEING SELECTED FROM THE GROUP CONSISTING OF DULFURIC ACID, PHOSPHORIC ACID, ALKANE SULFONIC ACID AND MIXTURES THEREOF, AND CONTINUING THE REACTION WITHIN SAID TEMPERATURE RANGE UNTIL A POLYMER OF THE DESIRED INTRINSIC VISCOSITY IS PRODUCED.
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) | 1956-02-10 | 1956-08-11 | 1957-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-02-10 | 1960-08-11 | 1961-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-02-10 | 1964-08-11 | 1965-02-10 | $7700.00 | Window Closed / Lapsed |