US4363883A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Structural materials and components
Assignee: I M L Corp A CORP OF
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Filing: 1980-09-12
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Granted: 1982-12-14
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Expires: 2000-09-12
Abstract
Abstract High density structural ("blocking") materials composed of a polyimide filled with glass microballoons. Structural components such as panels which have integral edgings and/or other parts made of the high density materials.
Inventors
- 👤 John Gagliani
- 👤 Raymond Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:43
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/32; C08K; C08K7/00; C08K7/22; C08K7/24; C08K7/28; C08L; C08L79/00; C08L79/04; C08L79/08; C08J2379/00; C08J2379/04; C08J2379/08; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24777; Y10T428/24942; Y10T428/24992; Y10T428/25; Y10T428/252; Y10T428/29; Y10T428/2982; Y10T428/31504; Y10T428/31721
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
77 words
A blocking material or the like which comprises a polymide foam having uniformly distributed therethrough glass microballoons of a size and in an amount which is effective to increase the screw withdrawal effectiveness of the polyimide, said polyimide being a copolyimide containing two primary diamines, one of said diamines being heterocyclic and having nitrogen in the ring and the other of said diamines being a para- or meta- substituted aromatic diamine which is free of aliphatic moieties.
Claim 2
Dependent Claim
77 words
A blocking material or the like which comprises a polymide foam having uniformly distributed therethrough glass microballoons of a size and in an amount which is effective to increase the screw withdrawal effectiveness of the polyimide, said polyimide being a copolyimide containing two primary diamines, one of said diamines being heterocyclic and having nitrogen in the ring and the other of said diamines being a para- or meta- substituted aromatic diamine which is free of aliphatic moieties.
Claim 3
Dependent Claim
34 words
A blocking material as defined in claim 1 wherein said heterocyclic diamine is present in said copolyimide foam in a ratio of 0.3 to 0.6 mole of diamine per mole of 3,3',4,4'-benzophenonetetracarboxylic acid ester.
Claim 4
Dependent Claim
81 words
A blocking material or the like which comprises a polyimide foam having uniformly distributed therethrough glass microballoons of a size and in an amount which is effective to increase the screw withdrawal effectiveness of the polyimide, said polyimide being a terpolyimide containing three diamines, one of said diamines being heterocyclic and having nitrogen in the ring, another of said diamines being a para- or meta-substituted aromatic diamine which is free of aliphatic moieties, and the third of said diamines being aliphatic.
Claim 5
Dependent Claim
81 words
A blocking material or the like which comprises a polyimide foam having uniformly distributed therethrough glass microballoons of a size and in an amount which is effective to increase the screw withdrawal effectiveness of the polyimide, said polyimide being a terpolyimide containing three diamines, one of said diamines being heterocyclic and having nitrogen in the ring, another of said diamines being a para- or meta-substituted aromatic diamine which is free of aliphatic moieties, and the third of said diamines being aliphatic.
Claim 6
Dependent Claim
36 words
A blocking material as defined in claim 3 wherein said terpolyimide foam contains from 0.05 to 0.3 mole of aliphatic diamine and from 0.1 to 0.3 mole of heterocyclic diamine per mole of 3,3',4,4'-benzophenonetetracarboxylic acid ester.
Claim 7
Dependent Claim
23 words
A blocking material as defined in claim 3 wherein the aliphatic diamine in the terpolyimide foam has from three to twelve carbon atoms.
Claim 8
Dependent Claim
28 words
A blocking material as defined in claim 3 wherein the aliphatic diamine in the terpolyimide foam has the formula ##STR2## where x is on the order of 2.6.
Claim 9
Dependent Claim
52 words
A blocking material as defined in either of the preceding claims 1 or 3 wherein the aromatic and heterocyclic diamines in the polyimide foam are selected from the following group: 2,6-diaminopyridine 3,5-diaminopyridine 3,3'-diaminodiphenyl sulfone 4,4'-diaminodiphenyl sulfone 4,4'-diaminodiphenyl sulfide 3,3'-diaminodiphenyl ether 4,4'-diaminodiphenyl ether meta-phenylene diamine para-phenylene diamine p,p'-methylene dianiline 2,6-diamino toluene 2,4-diamino toluene
Claim 10
Dependent Claim
39 words
A blocking material as defined in either of the preceding claims 1 or 3 which contains 0.07 to 0.12 mm diameter microballoons in an amount ranging from 5 to 50 percent based on the weight of the polyimide foam.
Claim 11
Dependent Claim
33 words
A blocking material as defined in either of the preceding claims 1 or 3 which includes a cross-linking agent in an amount which is effective to increase the hydrolytic stability of the material.
Claim 12
Dependent Claim
21 words
A blocking material as defined in claim 9 which includes from 10 to 20 weight percent of the cross linking agent.
References Cited (Backward Citations)
US3661849A
Cited
US3554939A
Cited
US3700649A
Cited
US3817927A
Cited
US3726834A
Cited
US3870677A
Cited
US4043986A
Cited
US3939109A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-12-13 | 1986-06-14 | 1986-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-13 | 1990-06-14 | 1990-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-13 | 1994-06-14 | 1994-12-14 | $7700.00 | Window Closed / Lapsed |