US4912197A
Expired / Lapsed
US
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Highly soluble clear polyimides
Assignee: LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
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Filing: 1988-04-19
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Granted: 1990-03-27
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Expires: 2008-04-19
Abstract
Abstract Highly soluble, optically transparent to clear aromatic polyimides in the visible range are disclosed. The dianhydrides from which the polyimides are prepared are 4,4'-[2,2,2-trifluoro-1-(trifluoromethyl) ethylidene] bis(1,2-benzenedicarboxylic anhydride) which can be partially replaced with either pyromellitic dianhydride or 3,3',4,4'-benzophenone tetracarboxylic dianhydride. The diamines from which the polyimides are prepared are m- or p- phenylene diamines which are substituted ortho to the amino groups with primary or secondary alkyl groups having 1 to 6 carbon atoms preferably methyl or ethyl.
Inventors
- 👤 Richard A. Hayes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:49
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1039; B; B01; B01D; B01D71/00; B01D71/06; B01D71/58; B01D71/62; B01D71/64; C08G73/1003; C08G73/1007; C08G73/1042; C08G73/1067; C08G73/1075; C08G73/1078; C08J; C08J5/00; C08J5/18; C08L; C08L79/00; C08L79/04; C08L79/08; C08J2379/00; C08J2379/04; C08J2379/08; C08L2201/00; C08L2201/10
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
78 words
An aromatic polyimide consisting essentially of repeating units having the formula: ##STR4## where --Ar-- is ##STR5## or mixtures thereof, --Ar'-- is ##STR6## --X, --X 1 , --X 2 , --X 3 and --X 4 are independently primary or secondary alkyl groups having 1 to 6 carbon atoms, --Z, --Z 1 , --Z 2 , --Z 3 , --Z 4 and --Z 5 are independently --H, or --X, r=100%--(t+v) t=0-50% when v=0% v=0-49%, when t=0% s=100%--u u=100% when (t+v)>1%.
Claim 2
Dependent Claim
78 words
An aromatic polyimide consisting essentially of repeating units having the formula: ##STR4## where --Ar-- is ##STR5## or mixtures thereof, --Ar'-- is ##STR6## --X, --X 1 , --X 2 , --X 3 and --X 4 are independently primary or secondary alkyl groups having 1 to 6 carbon atoms, --Z, --Z 1 , --Z 2 , --Z 3 , --Z 4 and --Z 5 are independently --H, or --X, r=100%--(t+v) t=0-50% when v=0% v=0-49%, when t=0% s=100%--u u=100% when (t+v)>1%.
Claim 3
Dependent Claim
8 words
The aromatic polyimide of claim 1 where v=0-25.
Claim 4
Dependent Claim
26 words
The aromatic polyimide of claim 2 wherein --X, --X 1 , --X 2 , --X 3 , and --CH 3 or --C 2 H 5 .
Claim 5
Dependent Claim
30 words
The aromatic polyimide of claim 1 where t, u, and v are 0, --Ar-- is ##STR7## and --X, --Z and Z 2 are --CH 3 and Z 1 is --H.
Claim 6
Dependent Claim
31 words
The aromatic polyimide of claim 1 wherein where t, u, and v are 0, --Ar-- is ##STR8## and --X, --X 1 , --X 2 and --X 3 are --CH 3 .
Claim 7
Dependent Claim
43 words
The aromatic polyimide of claim 1 where t, u, and v are 0, --Ar-- is a mixture of ##STR9## and ##STR10## --X, --X 1 , --X 2 , --X 3 , Z and Z 2 are --CH 3 and Z 1 is --H.
Claim 8
Dependent Claim
31 words
The aromatic polyimide of claim 1 wherein u and v are 0, t is 0-50, --Ar-- is ##STR11## --X, --Z and --Z 2 are --CH 3 and --Z 1 is --H.
Claim 9
Dependent Claim
31 words
The aromatic polyimide of claim 1 wherein t and u are 0, v is 0-49, --Ar-- is ##STR12## --X, --Z and --Z 2 are --CH 3 and --Z 1 is --H.
Claim 10
Dependent Claim
10 words
The aromatic polyimide of claim 8 which has been crosslinked.
Claim 11
Dependent Claim
22 words
The aromatic polyimide of claim 1 wherein t, u, and v are 0 and --Z, --Z 1 and --Z 2 are --H.
Claim 12
Dependent Claim
76 words
A process for the preparation of polyimides according to claim 1, which comprises subjecting at least one tetracarboxylic acid, or dianhydride derived thereof, of the formula ##STR13## by itself or together with at least one tetracarboxylic acid, or dianhydride derived thereof, of formula ##STR14## to a polycondensation reaction with at least one diamine of formula H 2 N--Ar'--NH 2 and then cyclizing the formed polyamide acid under the influence of heat/or the action of dehydrating agents.
Claim 13
Dependent Claim
60 words
A process for the preparation of polyimides according to claim 1, which comprises subjecting at least one tetracarboxylic acid, or dianhydride derived thereof, of the formula ##STR15## to a polycondensation reaction with at least one diamine of the formula H 2 N--Ar--NH 2 and then cyclizing the formed polyamide acid under the influence of heat/or the action of dehydrating agents.
Claim 14
Dependent Claim
17 words
The method of claim 11 wherein the dehydrating agents are a solution of acetic anhydride and triethylamine.
Claim 15
Dependent Claim
17 words
The method of claim 12 wherein the dehydrating agents are a solution of acetic anhydride and triethylamine.
Claim 16
Dependent Claim
21 words
A coated material consisting of a carrier material onto which a coating of a polyimide according to claim 1 is applied.
Claim 17
Dependent Claim
22 words
A high temperature stable, highly optically transparent-to-colorless in the visible range aromatic polyimide film prepared from the polyimide according to claim 1.
References Cited (Backward Citations)
US3723306A
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US3423491A
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FR2050251A1
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US3959350A
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US4629777A
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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) | 1993-03-26 | 1993-09-25 | 1994-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-26 | 1997-09-25 | 1998-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-26 | 2001-09-25 | 2002-03-27 | $7700.00 | Window Closed / Lapsed |