US3864310A
Expired / Lapsed
US
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High performance heterocyclic polymer polymerization via molten lewis acid eutectics
Assignee: Celanese Corp
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Filing: 1973-11-14
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Granted: 1975-02-04
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Expires: 1993-11-14
Abstract
Abstract An improved process is provided for the synthesis of high performance heterocyclic polymers wherein the polymerization is conducted in the presence of a molten Lewis Acid eutectic selected for its ability to dissolve the high molecular weight polymer; to remove water produced via the condensation reaction; and to melt substantially below the polymerization reaction temperature.
Inventors
- 👤 Lowell Saferstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:37
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/0683; C08G73/0694; C08G73/20
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
16 words
IN A PROCESS FOR SYNTHESIZING POLY (BENZIMIDAZOBENZPHENANTHROLINES) FROM A TETRACARBOXYLIC ACID REACTANT REPRESENTED BY THE FORMULA
Claim 2
Dependent Claim
16 words
IN A PROCESS FOR SYNTHESIZING POLY (BENZIMIDAZOBENZPHENANTHROLINES) FROM A TETRACARBOXYLIC ACID REACTANT REPRESENTED BY THE FORMULA
Claim 3
Dependent Claim
15 words
The process of claim 1 wherein the heavy metal halide is a transition element halide.
Claim 4
Dependent Claim
16 words
The process of claim 2 wherein the heavy metal transition element has a +2 valance state.
Claim 5
Dependent Claim
16 words
The process of claim 2 wherein the heavy metal transition element has a +3 valance state.
Claim 6
Dependent Claim
19 words
The process of claim 2 wherein the heavy metal transition element halide is a heavy metal transition element chloride.
Claim 7
Dependent Claim
16 words
The process of claim 2 wherein the heavy metal transition element halide is a non-hydrolizable bromide.
Claim 8
Dependent Claim
38 words
The process of claim 2 wherein the heavy metal transition element halide is selected from the group consisting of antimony trichloride, bismuth trichloride, aluminum trichloride, stannous dichloride, gallium chloride, germanium bromide, germanium chloride, zinc bromide, and zinc chloride.
Claim 9
Dependent Claim
53 words
The process of claim 1 wherein the tetraamine is selected from 3,3''-diaminobenzidine, bis(3,4-diamino phenyl) methane, 1,2-bis(3,4-diamino phenyl) ethane, 2,2-bis(3,4-diamino phenyl) propane, bis(3,4-diamino phenyl) ether, bis(3,4-diamino phenyl) sulfide, bis(3,4-diamino phenyl) sulfone, 1,4,5,8-tetraamino-naphthalene, 2,3,6,7-tetraaminonaphthalene, and their corresponding ring-hydrogenated tetraamines, and wherein the tetracarboxylic acid is selected from naphthalene tetracarboxylic acid, pyromellitic acid, and their anhydrides.
Claim 10
Dependent Claim
15 words
The process of claim 8 wherein the heavy metal halide is a transition element halide.
Claim 11
Dependent Claim
38 words
The process of claim 9 wherein the heavy metal transition element halide is selected from the group consisting of antimony trichloride, bismuth trichloride, aluminum trichloride, stannous dichloride, gallium chloride, germanium bromide, germanium chloride, zinc bromide and zinc chloride.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |