US4954610A
Expired / Lapsed
US
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Polyamide-imide polymers having fluorine-containing linking groups
Assignee: CNA Holdings LLC
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Filing: 1989-02-27
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Granted: 1990-09-04
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Expires: 2009-02-27
Abstract
Abstract The present invention provides novel heat stable polyamide-imide polymers having excellent flow properties which render them more readily processible into fibers, films, sheets and other molded articles. The polymers are prepared by forming the polycondensation product of one or more aromatic diamines and one or more trifunctional acid anhydride monomers, at least one of said diamine monomers containing the group ##STR1## linking two aromatic moieties, wherein R is CF 3 or phenyl. In addition to improved flow properties, the polyamide-imide polymers of this invention also exhibit improved solubility properties in most organic solvents, improved resistance to attack by chlorinated solvents such as trichloroethylene as compared with polyimides, improved hydrophobic properties as well as excellent thermal properties including resistance to thermooxidative degradation.
Inventors
- 👤 Paul N. Chen, Sr.
- 👤 Rohitkumar H. Vora
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:07
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/14
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
157 words
A polyamide-imide polymer containing at least one recurring structural unit of the formula: ##STR14## wherein the terms (a) and (b) are equal to the mole fraction of each recurring unit in the polymer chain and (a) ranges from about 0.0 to about 0.95, (b) ranges from about 1.00 to about 0.05, with the proviso that the sum of (a) and (b) is equal to 1.00, n is a number sufficient to give rise to a polyamide-imide inherent viscosity of at least about 0.05 as measured from a solution of the polymer in dimethylacetamide at 25° C. at a polymer concentration of 0.5 weight percent; A is a divalent aromatic moiety, and B is a divalent aromatic moiety containing the ring substituted or ring unsubstituted residuum selected from: ##STR15## wherein x is a non-interfering monovalent substituent selected from the group consisting of hydrogen, chloro, fluoro, lower alkyl or alkoxy having 1 to 6 carbon atoms, hydroxy and phenyl.
Claim 2
Dependent Claim
157 words
A polyamide-imide polymer containing at least one recurring structural unit of the formula: ##STR14## wherein the terms (a) and (b) are equal to the mole fraction of each recurring unit in the polymer chain and (a) ranges from about 0.0 to about 0.95, (b) ranges from about 1.00 to about 0.05, with the proviso that the sum of (a) and (b) is equal to 1.00, n is a number sufficient to give rise to a polyamide-imide inherent viscosity of at least about 0.05 as measured from a solution of the polymer in dimethylacetamide at 25° C. at a polymer concentration of 0.5 weight percent; A is a divalent aromatic moiety, and B is a divalent aromatic moiety containing the ring substituted or ring unsubstituted residuum selected from: ##STR15## wherein x is a non-interfering monovalent substituent selected from the group consisting of hydrogen, chloro, fluoro, lower alkyl or alkoxy having 1 to 6 carbon atoms, hydroxy and phenyl.
Claim 3
Dependent Claim
35 words
The polymer of claim 1 wherein B is the aromatic residuim of diamine selected from the group consisting of 2,2-bis (3-aminophenyl) hexafluoropropane, 2,2-bis (4-aminophenyl)herafluoropropane, 2-(3-aminophenyl)-2- (4-aminophenyl) hexafluoropropane, 2,2-bis (3-amino-4-methylphenyl) hexafluoropropane; or the -1-phenyl-2,2,2-trifluoroethane counterparts thereof.
Claim 4
Dependent Claim
9 words
The polymer of claim 2 wherein (a) is zero.
Claim 5
Dependent Claim
14 words
The polymer of claim 3 wherein the inherent viscosity is at least 0.1 dl./g.
Claim 6
Dependent Claim
23 words
The polymer of claim 2 wherein (a) ranges from about 0.05 to about 0.95 and (b) ranges from about 0.95 to about 0.05.
Claim 7
Dependent Claim
73 words
The polymer of claim 5 wherein A is the aromatic residuum of a diaryl diamine having the formula: ##STR16## wherein R' is a divalent moiety independently selected from a covalent carbon to carbon bond, methylene, ethylene, propylene, isopropylene, hexafluoroisopropylidene, 1-phenyl-2,2,2-trifluoroethylidene, dichloro and difluoroalkylenes up to 3 carbons, oxy, thio, sulfinyl, sulfonyl, sulfonamido, carbonyl, oxydicarbonyl, oxydimethylene, sulfonyldioxy, carbonyldioxy, disilanylene, polysilanylene up to 8 Si atoms; disiloxanylene, and a polysiloxanylene up to 8 Si atoms.
Claim 8
Dependent Claim
9 words
The polymer of claim 6 wherein R' is ##STR17##
Claim 9
Dependent Claim
9 words
The polymer of claim 6 wherein R' is methyl.
Claim 10
Dependent Claim
9 words
The polymer of claim 6 wherein R' is oxygen.
Claim 11
Dependent Claim
19 words
The polymers of claims 1 or 5 containing from about 1 to about 100 mole percent of fluorine-containing monomers.
Claim 12
Dependent Claim
17 words
The polymers of claim 10 containing from about 2 to about 50 mole percent of fluorine-containing monomers.
Claim 13
Dependent Claim
9 words
A shaped article comprising the polymer of claim 1.
Claim 14
Dependent Claim
12 words
The shaped article of claim 12 produced by a compression molding process.
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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) | 1993-09-03 | 1994-03-05 | 1994-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-03 | 1998-03-05 | 1998-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-03 | 2002-03-05 | 2002-09-04 | $7700.00 | Window Closed / Lapsed |