Patent US4009153A successfully refreshed from Google Patents.
US4009153A
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Vapor-phase preparation of aromatic polyamides
Assignee: EIDP Inc
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Filing: 1975-03-04
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Granted: 1977-02-22
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Expires: 1995-03-04
Abstract
Abstract Vapor-phase condensation polymerization of aromatic polyamides is carried out by vaporizing polyamide-forming monomers, diluting with an inert gas, and reacting the monomers in a reaction zone heated in the range of about 150° C. to about 500° C. from about 0.01 second to about 5 seconds or longer. The polyamide is preferably deposited on a removable inorganic or organic substrate maintained within the zone.
Inventors
- 👤 Hyunkook Shin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:55
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/26; C08G69/32; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31725
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
78 words
A process for the preparation of film-forming aromatic polyamides by direct vapor phase condensation of one or more aromatic diamines and one or more aromatic diacid halides which comprises vaporizing the diamine(s) and diacid halide(s), mixing the vaporized diamine and diacid halide in the presence of an inert diluent gas and reacting the mixture in a reaction zone at a temperature between about 150° C and 500° C for at least 0.01 second, and collecting the aromatic polyamide.
Claim 2
Dependent Claim
78 words
A process for the preparation of film-forming aromatic polyamides by direct vapor phase condensation of one or more aromatic diamines and one or more aromatic diacid halides which comprises vaporizing the diamine(s) and diacid halide(s), mixing the vaporized diamine and diacid halide in the presence of an inert diluent gas and reacting the mixture in a reaction zone at a temperature between about 150° C and 500° C for at least 0.01 second, and collecting the aromatic polyamide.
Claim 3
Dependent Claim
51 words
The process as defined in claim 1 wherein said temperature is between about 250° C and 400° C, the gas residence time in said zone is less than about 5 seconds, and the total concentration of diamine and diacid halide in said zone is between about 2 to 50 mole percent.
Claim 4
Dependent Claim
29 words
The process as defined in claim 1 wherein said temperature is above about 325° C. and the gas residence time in said zone is less than about 1.5 seconds.
Claim 5
Dependent Claim
42 words
The process as defined in claim 2 wherein the concentration of diamine and diacid halide in said zone is between about 2 and 10 mole percent and said reaction zone contains inert substrate particles having a softening point above said reaction temperature.
Claim 6
Dependent Claim
14 words
The process defined in claim 1 wherein the diacid halide is a diacid chloride.
Claim 7
Dependent Claim
22 words
The process as defined in claim 5 wherein said aromatic diamine is p-phenylene diamine and said aromatic diacid halide is terephthaloyl chloride.
Claim 8
Dependent Claim
21 words
The process defined in claim 5 wherein said aromatic diamine is m-phenylene diamine and said aromatic diacid halide is terephthaloyl chloride.
Claim 9
Dependent Claim
22 words
The process as defined in claim 5 wherein said aromatic diamine is m-phenylene diamine and said aromatic diacid halide is isophthaloyl chloride.
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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) | 1980-02-22 | 1980-08-23 | 1981-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-22 | 1984-08-23 | 1985-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-22 | 1988-08-23 | 1989-02-22 | $7700.00 | Window Closed / Lapsed |