US4769475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bis(hydroxyphthalimide) and process for preparing the same, and process for preparing polyesterimide by the use thereof
Assignee: NTT Inc
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Filing: 1986-03-14
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Granted: 1988-09-06
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Expires: 2006-03-14
Abstract
Abstract The present invention provides a bis(hydroxyphthalimide) prepared by reacting 4-hydroxyphthalic anhydride and an organic diamine in the presence of an organic solvent under heating. The bis(hydroxyphthalimide) has two intramolecular imide rings and active hydrogens, and is thus polymerizable to form a variety of polycondensation products each having imide rings by condensation. The bis(hydroxyphthalimide) is also reacted with a dicarboxylic acid dihalide to form a polyesterimide, through condensation, which is excellent in transparency and heat resisting property.
Inventors
- 👤 Shigekuni Sasaki
- 👤 Yoshinori Hasuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:30
CPC Classifications
C; C07; C07D; C07D209/00; C07D209/02; C07D209/44; C07D209/48
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
53 words
A bis(hydroxyphthalimide) represented by the following formula: ##STR23## wherein R is a difunctional organic group selected from the groups (a), (b) and (c) wherein: (a) is an aromatic hydrocarbon group selected from the group consisting of m-phenylene, p-phenylene and chloro m-phenylene; (b) is hexylene; and (c) is diphenylmethane, diphenylsulfide, diphenylsulfone, diphenylether or diphenylketone.
Claim 2
Dependent Claim
53 words
A bis(hydroxyphthalimide) represented by the following formula: ##STR23## wherein R is a difunctional organic group selected from the groups (a), (b) and (c) wherein: (a) is an aromatic hydrocarbon group selected from the group consisting of m-phenylene, p-phenylene and chloro m-phenylene; (b) is hexylene; and (c) is diphenylmethane, diphenylsulfide, diphenylsulfone, diphenylether or diphenylketone.
Claim 3
Dependent Claim
14 words
The bis(hydroxyphthalimide) according to claim 1, wherein R is m-phenylene, p-phenylene or chloro m-phenylene.
Claim 4
Dependent Claim
15 words
The bis(hydroxyphthalimide) according to claim 1, wherein R is hexylene (--C 6 H 12 --).
Claim 5
Dependent Claim
17 words
The bis(hydroxyphthalimide) according to claim 1, wherein R is diphenylmethane, diphenylsulfide, diphenylsulfone, diphenyl ether or diphenyl ketone.
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) | 1991-09-06 | 1992-03-07 | 1992-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-06 | 1996-03-07 | 1996-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-06 | 2000-03-07 | 2000-09-06 | $7700.00 | Window Closed / Lapsed |