US4367296A
Expired / Lapsed
US
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Structural materials and components
Assignee: I M L Corp A CORP OF
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Filing: 1981-11-24
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Granted: 1983-01-04
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Expires: 2001-11-24
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
2026-10-27 15:51
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/32; C08L; C08L79/00; C08L79/04; C08L79/08; C08J2379/00; C08J2379/04; C08J2379/08; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249971; Y10T428/249974; Y10T428/25; Y10T428/252
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
78 words
A structural component comprising an integrated assembly of a reinforced polyimide foam and a blocking material which is a polyimide having uniformly distributed therethroughout glass microballoons of a size and in an amount which is effective to increase the screw withdrawal resistance of the polyimide in which said microballoons are distributed, the polyimide that is foamed and the polyimide in the blocking material both being polymerization products of a 3,3',4,4'-benzophenonetetracarboxylic acid diester and at least two primary diamines.
Claim 2
Dependent Claim
78 words
A structural component comprising an integrated assembly of a reinforced polyimide foam and a blocking material which is a polyimide having uniformly distributed therethroughout glass microballoons of a size and in an amount which is effective to increase the screw withdrawal resistance of the polyimide in which said microballoons are distributed, the polyimide that is foamed and the polyimide in the blocking material both being polymerization products of a 3,3',4,4'-benzophenonetetracarboxylic acid diester and at least two primary diamines.
Claim 3
Dependent Claim
53 words
A structural component as defined in claim 1 wherein at least one of said polyimides is 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 4
Dependent Claim
33 words
A structural component as defined in claim 2 wherein said heterocyclic diamine is present in said copolyimide in a ratio of 0.3 to 0.6 mole of diamine per mole of 3,3',4,4'-benzophenonetetracarboxylic acid ester.
Claim 5
Dependent Claim
58 words
A structural component as defined in claim 1 wherein at least one of said polyimides is 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
35 words
A structural component as defined in claim 4 wherein said terpolyimide 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
22 words
A structural component as defined in claim 4 wherein the aliphatic diamine in the terpolyimide has from three to twelve carbon atoms.
Claim 8
Dependent Claim
27 words
A structural component as defined in claim 4 wherein the aliphatic diamine in the terpolyimide has the formula ##STR2## where x is on the order of 2.6.
Claim 9
Dependent Claim
51 words
A structural component as defined in either of the preceding claims 2 or 4 wherein the aromatic and heterocyclic diamines in the polyimide are selected from the following group: 2,6-diaminopyridine 3,5-diaminopyridine 3,3'-diaminodipyenyl 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
38 words
A structural component as defined in claim 1 wherein the blocking material 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 in that material.
Claim 11
Dependent Claim
30 words
A structural component as defined in claim 1 wherein the blocking material contains a cross-linking agent in an amount which is effective to increase the hydrolytic stability of the material.
Claim 12
Dependent Claim
23 words
A structural component as defined in claim 10 wherein the blocking material includes from 10 to 20 weight percent of the cross-linking agent.
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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) | 1986-01-03 | 1986-07-05 | 1987-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-03 | 1990-07-05 | 1991-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-03 | 1994-07-05 | 1995-01-04 | $7700.00 | Window Closed / Lapsed |