Patent US4346182A successfully refreshed from Google Patents.
US4346182A
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Polyimides
Assignee: I M L Corp A CORP OF
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Filing: 1981-04-14
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Granted: 1982-08-24
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Expires: 2001-04-14
Abstract
Abstract Terpolyimides prepared from tetracarboxylic acid esters and combinations of heterocyclic, aromatic, and aliphatic diamines and artifacts composed of those terpolymers. Precursors, and methods of converting them to the corresponding terpolymers.
Inventors
- 👤 John Gagliani
- 👤 Raymond Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:06
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/02; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1003; C08G73/1007; C08G73/1028; C08J2379/00; C08J2379/04; C08J2379/08
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
74 words
A foamable terpolyimide precursor comprising an essentially stoichiometric mixture of an alkyl ester of 3,3',4,4'-benzophenonetetracarboxylic acid or a mixture of such esters and at least three diamines, one of said diamines being heterocyclic, a second of said diamines being aromatic, a third of said diamines being aliphatic, and said precursor containing from 0.05 to 0.5 mole of aliphatic diamine and from 0.05 to 0.9 mole of heterocyclic diamine per mole of benzophenonetetracarboxylic acid ester(s).
Claim 2
Dependent Claim
74 words
A foamable terpolyimide precursor comprising an essentially stoichiometric mixture of an alkyl ester of 3,3',4,4'-benzophenonetetracarboxylic acid or a mixture of such esters and at least three diamines, one of said diamines being heterocyclic, a second of said diamines being aromatic, a third of said diamines being aliphatic, and said precursor containing from 0.05 to 0.5 mole of aliphatic diamine and from 0.05 to 0.9 mole of heterocyclic diamine per mole of benzophenonetetracarboxylic acid ester(s).
Claim 3
Dependent Claim
20 words
A terpolyimide precursor as defined in claim 1 in which the aliphatic diamine has from three to twelve carbon atoms.
Claim 4
Dependent Claim
20 words
A terpolyimide precursor as defined in claim 2 in which the aliphatic diamine has not more than six carbon atoms.
Claim 5
Dependent Claim
26 words
A terpolyimide precursor as defined in either of the preceding claims 2 or 3 in which the aliphatic amine has an even number of carbon atoms.
Claim 6
Dependent Claim
25 words
A terpolyimide precursor as defined in claim 1 in which the aliphatic diamine has the formula: ##STR3## where x is on the order of 2.6.
Claim 7
Dependent Claim
40 words
A terpolyimide precursor as defined in claim 1 which includes a surface active agent in an amount effective to improve the bubble stability of and produce a more uniform cellular structure in the polyimide to which the precursor is converted.
Claim 8
Dependent Claim
25 words
A terpolyimide precursor as defined in claim 1 which is a dry powder and which has a maximum particle size of at least 50 microns.
Claim 9
Dependent Claim
34 words
A terpolyimide precursor as defined in claim 1 in which the ester constituent is a methyl or ethyl half ester of 3,3',4,4'-benzophenonetetracarboxylic acid and the diamines are 2,6-diamino pyridine, p,p'-methylene dianiline, and 1,6-diamino hexane.
Claim 10
Dependent Claim
31 words
A terpolyimide precursor as defined in claim 8 in which the molar ratio of said constituents is: ______________________________________
3,3',4,4'-benzophenonetetracarboxylic acid
1.0
2,6-diamino pyridine 0.3
p,p'-methylene dianiline 0.4-0.65
1,6-diamino hexane 0.05-0.3.
______________________________________
Claim 11
Dependent Claim
23 words
A terpolyimide precursor as defined in claim 1 which includes a filler intimately admixed with said mixture of diamines and tetracarboxylic acid ester(s).
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-08-23 | 1986-02-22 | 1986-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-23 | 1990-02-22 | 1990-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-23 | 1994-02-22 | 1994-08-24 | $7700.00 | Window Closed / Lapsed |