US5026822A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High molecular weight polyimide, method of making same and articles formed therefrom
Assignee: Hoechst Celanese Chemical Co
•
Filing: 1988-07-12
•
Granted: 1991-06-25
•
Expires: 2008-07-12
Abstract
Abstract A novel composition consisting essentially of a polyimide of the formula: ##STR1## wherein R is: ##STR2## is disclosed and claimed. The composition has a weight average molecular weight, M w of at least 75,000 and a polydispersity of from about 1.8 to about 2.6.
Inventors
- 👤 Rohitkumar H. Vora
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:52
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1039
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
64 words
A composition essentially of polyimide of the formula: ##STR5## wherein R is ##STR6## and wherein said composition has a weight average molecular weight, M w of at least about 100,000 and a polydispersity of from about 1.8 to about 2.6; said weight average molecular weight being measured by gel permeation chromatography using a polystyrene calibration standard ranging in molecular weight from 1,250 to 470,000.
Claim 2
Dependent Claim
64 words
A composition essentially of polyimide of the formula: ##STR5## wherein R is ##STR6## and wherein said composition has a weight average molecular weight, M w of at least about 100,000 and a polydispersity of from about 1.8 to about 2.6; said weight average molecular weight being measured by gel permeation chromatography using a polystyrene calibration standard ranging in molecular weight from 1,250 to 470,000.
Claim 3
Dependent Claim
31 words
The composition according to claim 1, wherein said composition is prepared from equimolar amounts of 2,2-bis(3,4-dicarboxyphenyl) hexafluoropropane and a diamine selected from the group consisting of 2,2-bis(4-aminophenyl) hexafluoropropane and 2,2-bis(3-aminophenyl) hexafluoropropane.
Claim 4
Dependent Claim
23 words
The composition according to claim 1, wherein the weight average molecular weight, M w , of said composition is at least about 150,000.
Claim 5
Dependent Claim
20 words
The composition according to claim 3, wherein the weight average molecular weight, M w , is at least about 200,000.
Claim 6
Dependent Claim
19 words
The composition according to claim 4, wherein the average molecular weight, M w , is at least about 250,000.
Claim 7
Dependent Claim
10 words
A moldable composition containing the polyimide according to claim 1.
Claim 8
Dependent Claim
19 words
The composition according to claim 1, wherein the polydispersity of said polymide is from about 1.9 to about 2.5.
Claim 9
Dependent Claim
18 words
The composition according to claim 7, wherein the polydispersity of said composition is about 1.9 to about 2.4.
Claim 10
Dependent Claim
11 words
The composition according to claim 1, formed into a shaped acticle.
Claim 11
Dependent Claim
11 words
The composition according to claim 6, formed into a shaped article.
Claim 12
Dependent Claim
122 words
A polymer composition consisting essentially of a polyimide of the formula: ##STR7## wherein R is ##STR8## prepared from equimolar amounts of 2,2-bis(3,4-dicarboxyphenyl) hexafluoropropane dianhydride and a diamine selected from the group consisting of 2,2-bis(4-aminophenyl) hexafluoropropane and 2,2-bis(3-aminophenyl) hexafluoropropane wherein said polyimide has a weight average molecular weight, M w , of at least about 100,000 and wherein said composition is capable of being formed into a film of about two thousandths of an inch in thickness having as an essential characteristic at least about 80% optical transmission at electromagnetic wavelengths of 400 nanometers and above, said film being non-brittle; said weight average molecular weight being measured by gel permeation chromatography using a polystyrene standard ranging in molecular weight from 1,250 to 470,000.
Claim 13
Dependent Claim
122 words
A polymer composition consisting essentially of a polyimide of the formula: ##STR7## wherein R is ##STR8## prepared from equimolar amounts of 2,2-bis(3,4-dicarboxyphenyl) hexafluoropropane dianhydride and a diamine selected from the group consisting of 2,2-bis(4-aminophenyl) hexafluoropropane and 2,2-bis(3-aminophenyl) hexafluoropropane wherein said polyimide has a weight average molecular weight, M w , of at least about 100,000 and wherein said composition is capable of being formed into a film of about two thousandths of an inch in thickness having as an essential characteristic at least about 80% optical transmission at electromagnetic wavelengths of 400 nanometers and above, said film being non-brittle; said weight average molecular weight being measured by gel permeation chromatography using a polystyrene standard ranging in molecular weight from 1,250 to 470,000.
Claim 14
Dependent Claim
33 words
The composition according to claim 11, wherein said composition is capable of forming a film having as an essential characteristic at least about 85% optical transmission at wavelengths of 425 nanometers and above.
Claim 15
Dependent Claim
23 words
The composition according to claim 11, wherein the weight average molecular weight, M w , of said composition is at least about 150,000.
Claim 16
Dependent Claim
19 words
The composition according to claim 11, wherein the polydispersity of said polyimide is from about 1.8 to about 2.6.
Claim 17
Dependent Claim
19 words
The composition according to claim 11, wherein the polydispersity of said polyimide is from about 1.8 to about 2.5.
Claim 18
Dependent Claim
19 words
The composition according to claim 11, wherein the polydispersity of said composition is from about 1.9 to about 2.4.
Claim 19
Dependent Claim
11 words
The composition according to claim 16, formed into a shaped article.
Claim 20
Dependent Claim
11 words
The composition according to claim 11, formed into a shaped article.
Claim 21
Dependent Claim
11 words
The composition according to claim 11, wherein said film is colorless.
Claim 22
Dependent Claim
112 words
A composition comprising a polyamic acid of the formula: ##STR9## wherein R is ##STR10## prepared from equimolar amounts of 2,2-bis(3,4dicarboxyphenyl) hexafluoropropane dianhydride and a diamine selected from the group consisting of 2,2-bis(4-aminophenyl) hexafluoropropane and 2,2-bis(3-aminophenyl) hexafluoropropane and wherein said composition is capable of being cyclized into a polyimide composition consisting essentially of a polyimide of the formula: ##STR11## wherein R is ##STR12## and wherein said polyimide composition has a weight average molecular weight, M w of at least about 100,000 and a polydispersity of from about 1.8 to about 2.6; said molecular weight being measured by gel permeation chromatography using a polystyrene calibration standard ranging in molecular weight from 1,250 to 470,000.
Claim 23
Dependent Claim
112 words
A composition comprising a polyamic acid of the formula: ##STR9## wherein R is ##STR10## prepared from equimolar amounts of 2,2-bis(3,4dicarboxyphenyl) hexafluoropropane dianhydride and a diamine selected from the group consisting of 2,2-bis(4-aminophenyl) hexafluoropropane and 2,2-bis(3-aminophenyl) hexafluoropropane and wherein said composition is capable of being cyclized into a polyimide composition consisting essentially of a polyimide of the formula: ##STR11## wherein R is ##STR12## and wherein said polyimide composition has a weight average molecular weight, M w of at least about 100,000 and a polydispersity of from about 1.8 to about 2.6; said molecular weight being measured by gel permeation chromatography using a polystyrene calibration standard ranging in molecular weight from 1,250 to 470,000.
References Cited (Backward Citations)
GB1062435A
Cited
US3542735A
Cited
US3639343A
Cited
US3678005A
Cited
US3649601A
Cited
US3812082A
Cited
US3899309A
Cited
US4080319A
Cited
US3926913A
Cited
US4063984A
Cited
US4079039A
Cited
US3896083A
Cited
US4061856A
Cited
US4111906A
Cited
US4196277A
Cited
US4173700A
Cited
US4218555A
Cited
US4251419A
Cited
US4206106A
Cited
US4255313A
Cited
US4251420A
Cited
US4220750A
Cited
US4251417A
Cited
US4251418A
Cited
US4299750A
Cited
US4284461A
Cited
US4336175A
Cited
US4736015A
Cited
US4454310A
Cited
US4467000A
Cited
US4684714A
Cited
US4654415A
Cited
US4656244A
Cited
US4535101A
Cited
US4542257A
Cited
US4588804A
Cited
US4720539A
Cited
US4569988A
Cited
US4734464A
Cited
US4716216A
Cited
US4735492A
Cited
US4645824A
Cited
US4742152A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-06-24 | 1994-12-24 | 1995-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-06-24 | 1998-12-24 | 1999-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-06-24 | 2002-12-24 | 2003-06-25 | $7700.00 | Window Closed / Lapsed |