Patent US4952669A successfully refreshed from Google Patents.
US4952669A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolyimides prepared from 2-(3-aminophenyl)-2-(4-aminophenyl) Hexafluoro propane
Assignee: Hoechst Celanese Chemical Co
•
Filing: 1988-09-30
•
Granted: 1990-08-28
•
Expires: 2008-09-30
Abstract
Abstract Coolyimides and copolyamide-acids having improved solubility and processing characteristics are provided having incorporated into the polymeric chain as a novel aromatic diamine compound, 2-(3-aminophenyl)-2-(4-aminophenyl) hexafluoropropane (3,4'-6F Diamine). The copolyamide-acids and copolyimides are prepared by reacting the 3,4'-6F Diamine with a mixture of two or more aromatic tetracarboxylic acids or anhydrides thereof. It has been found that the copolyimides of this invention have improved solubility characteristics, low dielectric constants and improved thermal flow properties as a consequence of the meta/para positioning of the amino groups on the diamine, which renders these copolymers more readily melt sqinnable for the production of fibers. The copolymers may also be compression molded and fabricated into composites at moderate temperatures and pressures. Solutions of the copolyimides may be cast into films.
Inventors
- 👤 Rohitkumar H. Vora
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:29
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1039; C08G73/1042
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
50 words
A copolyimide polymer comprising recurring groups having the structure: ##STR3## wherein n is the number of repeating groups, a and b are whole numbers independently selected from 1 up to about 5, R and R' are different tetravalent aromatic organic radicals, and Q is the residuum having the formula: ##STR4##
Claim 2
Dependent Claim
50 words
A copolyimide polymer comprising recurring groups having the structure: ##STR3## wherein n is the number of repeating groups, a and b are whole numbers independently selected from 1 up to about 5, R and R' are different tetravalent aromatic organic radicals, and Q is the residuum having the formula: ##STR4##
Claim 3
Dependent Claim
54 words
The copolymer of claim 1 wherein R and R' are selected from the group consisting of phenylene, naphthalene, and bis-phenylene compounds which may be unsubstituted or ring substituted with a radical selected from the group consisting of halogen, hydroxy, lower C 1 to C 6 alkyl and lower C 1 to C 6 alkoxy.
Claim 4
Dependent Claim
43 words
The copolymer of claim 1 wherein n is a number sufficient to provide an inherent viscosity of at least about 0.2 dl/g as measured from a solution of the polymer in dimethylacetamide at 25° C. at a polymer concentration of 0.5 weight percent.
Claim 5
Dependent Claim
27 words
The copolymer of claim 1 prepared by forming the amide-acid condensation product of 2-(3-aminophenyl)-2-(4-aminophenyl) hexafluoropropane with a mixture of aromatic dianhydrides and imidizing said amide-acid condensation product.
Claim 6
Dependent Claim
49 words
The copolymer of claim 4 wherein said aromatic dianhydrides are selected from the group consisting of mixtures of two or more of bis (3,4-dicarboxyphenyl) ether dianhydride, 3,3',4,4'benzophenone tetracarboxylic dianhydride, 3,3',4,4'-diphenyl tetracarboxylic acid dianhydride, 2,2-bis (3,4 dicarboxy phenyl) hexafluoropropane dianhydride, 1,2,4,5-benzene tetracarboxylic acid dianhydride, and 4,4'-bis[2-(3,4- dicarboxyphenyl) hexafluoroisopropyl]diphenyl ether dianhydride.
Claim 7
Dependent Claim
34 words
The copolymer of claim 4 wherein said amide-acid condensation product includes a mixture of said 2-(3-aminophenyl)-2-(4-aminophenyl) hexafluoropropane with at least one other diamine having the formula: NH.sub.2 --Y--NH.sub.2 wherein Y is an aromatic moiety.
Claim 8
Dependent Claim
43 words
The copolymer of claim 5 wherein n is a number sufficient to provide an inherent viscosity of at least about 0.2 dl/g as measured from a solution of the copolymer in dimethylacetamide at 25° C. at a copolymer concentration of 0.5 weight percent.
Claim 9
Dependent Claim
16 words
The copolymer of claim 7 wherein one of said dianhydrides is 2,2-bis (3,4 dicarboxyphenyl) hexafluoropropane dianhydride.
Claim 10
Dependent Claim
15 words
The copolymer of claim 7 wherein one of said dianhydrides is 1,2,4,5-benzene tetracarboxylic acid dianhydride.
Claim 11
Dependent Claim
13 words
The copolymer of claim 8 wherein said mixture contains 1,2,4,5-benzene tetracarboxylic acid dianhydride.
Claim 12
Dependent Claim
27 words
The copolymer of claim 5 wherein said mixed dianhydrides are present at a relative molar ratio of from about 3 to 1 to about 1 to 3.
Claim 13
Dependent Claim
15 words
The copolymer of claim 11 wherein said mixed dianhydrides are present in approximately equimolar amounts.
Claim 14
Dependent Claim
17 words
The copolymer of claim 5 wherein said diamine and said dianhydride are reacted in approximately equi-molar amounts.
Claim 15
Dependent Claim
9 words
The copolyimide of claim 1 dissolved in organic solvent.
Claim 16
Dependent Claim
8 words
A fiber comprising the copolyimide of claim 1.
Claim 17
Dependent Claim
8 words
A film comprising the copolyimide of claim 1.
Claim 18
Dependent Claim
11 words
A compression molded shaped article comprising the copolyimide of claim 1.
References Cited (Backward Citations)
GB1062435A
Cited
US3328352A
Cited
US3356648A
Cited
US3792148A
Cited
US4075172A
Cited
US4111906A
Cited
US4592925A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-08-27 | 1994-02-26 | 1994-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-27 | 1998-02-26 | 1998-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-27 | 2002-02-26 | 2002-08-28 | $7700.00 | Window Closed / Lapsed |