US5055593A
Expired / Lapsed
US
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1,3-bis(dicarboxyphenyl)-1,1,3,3-tetraphenyldisiloxane derivative, process for producing the same, and process for producing polyimide from the same
Assignee: Resonac Corp
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Filing: 1989-10-30
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Granted: 1991-10-08
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Expires: 2009-10-30
Abstract
Abstract 1,3-Bis(dicarboxyphenyl)-1,1,3,3-tetraphenyldisiloxane derivatives useful as raw materials of polyimide resins, hardeners for epoxy resins and others and process for producing these derivatives, and polyamic acid and polyamic acid ester, and polyimide resins and processes for producing them from said disiloxane derivatives. The polyimide resins are good in properties such as adhesion to silicon substrates, heat resistance and mechanical properties.
Inventors
- 👤 Akihiro Sasaki
- 👤 Tohru Kikuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:16
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/0834; C07F7/0838
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
30 words
A 1,3-bis(dicarboxyphenyl)-1,1,3,3-tetraphenyldisiloxane dianhydride represented by the general formula [I]: ##STR14## wherein two acid anhydride residues independently of each other are attached to the adjacent phenyl rings at 2,3-positions or 3,4-positions.
Claim 2
Dependent Claim
30 words
A 1,3-bis(dicarboxyphenyl)-1,1,3,3-tetraphenyldisiloxane dianhydride represented by the general formula [I]: ##STR14## wherein two acid anhydride residues independently of each other are attached to the adjacent phenyl rings at 2,3-positions or 3,4-positions.
Claim 3
Dependent Claim
2 words
1,3-Bis(3,4-dicarboxyphenyl)-1,1,3,3-tetraphenyldisiloxane dianhydride.
Claim 4
Dependent Claim
2 words
1,3-Bis(3,4-dicarboxyphenyl)-1,1,3,3-tetraphenyldisiloxane dianhydride.
Claim 5
Dependent Claim
2 words
1,3-Bis(2,3-dicarboxyphenyl)-1,1,3,3-teetraphenyldisiloxane dianhydride.
Claim 6
Dependent Claim
2 words
1,3-Bis(2,3-dicarboxyphenyl)-1,1,3,3-teetraphenyldisiloxane dianhydride.
Claim 7
Dependent Claim
2 words
1-(2,3-Dicarboxyphenyl)-3-(3,4-dicarboxyphenyl)-1,1,3,3-tetraphenyldisiloxane dianhydride.
Claim 8
Dependent Claim
2 words
1-(2,3-Dicarboxyphenyl)-3-(3,4-dicarboxyphenyl)-1,1,3,3-tetraphenyldisiloxane dianhydride.
References Cited (Backward Citations)
US2891981A
Cited
GB981824A
Cited
US3516964A
Cited
US3940426A
Cited
US4370487A
Cited
US4864027A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-10-07 | 1995-04-08 | 1995-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-10-07 | 1999-04-08 | 1999-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-10-07 | 2003-04-08 | 2003-10-08 | $7700.00 | Window Closed / Lapsed |