US5399664A
Expired / Lapsed
US
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Second order nonlinear optical polyimide polymer with high temperature stability
Assignee: Arch Development Corp
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Filing: 1993-11-10
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Granted: 1995-03-21
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Expires: 2013-11-10
Abstract
Abstract The invention relates generally to polymers exhibiting second order nonlinear optical properties, and characterized by high thermal stability. Disclosed are polymers prepared by a polycondensation reaction between an aromatic dianhydride and a compound selected from the group consisting of a di(alkylamino)amine and an aromatic diamine. Most preferred are polymers that are the products of a polycondensation reaction between 1,2,4,5-benzenetetracarboxylic dianhydride and nitro(N,N-diethylamino)stilbene, wherein the polymer is imidized by further heat treatment.
Inventors
- 👤 Zhonghua Peng
- 👤 Luping Yu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:20
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1075; C08G73/1078; C08G73/1003; C08G73/1007
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
55 words
A polyimide polymer exhibiting second order, nonlinear optical properties, further characterized by high-temperature stability, wherein said polymer is prepared via a polycondensation reaction between 1,2,4,5-benzenetetracarboxylic dianhydride and nitro(N,N-diethylamino)stilbene to form a polyamic acid intermediate and curing the polyamic acid intermediate within an electric field pole or corona pole under conditions sufficient to form said polymer.
Claim 2
Dependent Claim
55 words
A polyimide polymer exhibiting second order, nonlinear optical properties, further characterized by high-temperature stability, wherein said polymer is prepared via a polycondensation reaction between 1,2,4,5-benzenetetracarboxylic dianhydride and nitro(N,N-diethylamino)stilbene to form a polyamic acid intermediate and curing the polyamic acid intermediate within an electric field pole or corona pole under conditions sufficient to form said polymer.
Claim 3
Dependent Claim
21 words
The polymer of claim 1, wherein the high-temperature stability is retained at temperatures in the range of 150° to 180° C.
Claim 4
Dependent Claim
24 words
The polymer of claim 2, wherein the high temperature stability is indicated by retention of at least 70% of a second harmonic generation signal.
Claim 5
Dependent Claim
40 words
The polymer of claim 1 wherein said polyamic acid intermediate is cured by heating the intermediate above its glass transition temperature (T g ) for between about 1 and about 24 hours and subsequently cooling the product to room temperature.
Claim 6
Dependent Claim
14 words
The polymer of claim 4 wherein said glass transition temperature is approximately 180° C.
Claim 7
Dependent Claim
24 words
The polymer of claim 1 wherein said electric field is applied in a strength between about 0.05 to about 1.5 megavolts per centimeter (MV/cm).
Claim 8
Dependent Claim
8 words
A polyimide polymer having the general structure: ##STR1##
Claim 9
Dependent Claim
8 words
A polyimide polymer having the general structure: ##STR1##
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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) | 1998-03-20 | 1998-09-19 | 1999-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-03-20 | 2002-09-19 | 2003-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-03-20 | 2006-09-19 | 2007-03-21 | $7700.00 | Window Closed / Lapsed |