Patent US5132394A successfully refreshed from Google Patents.
US5132394A
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US
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Fiber-reinforced composites comprising amide-imide copolymer matrix resin
Assignee: BP Corp North America Inc
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Filing: 1989-08-24
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Granted: 1992-07-21
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Expires: 2009-08-24
Abstract
Abstract Composites comprising polyamide-imide matrix resins derived from trimellitic acid compounds and an aromatic diamine are improved in moisture resistance when from 10 to about 90 mole % of the trimellitic acid compounds are replaced by biphenyl tetracarboxylic acid compounds.
Inventors
- 👤 Ronald E. Bockrath
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:22
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/14
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
85 words
A fiber-reinforced composition comprising from about 5 to about 80 wt % of a reinforcing fiber and a polyamide-imide matrix resin derived from at least one trimellitic acid compound selected from the group consisting of trimellitic acid anhydride and 4-trimellitoyl anhydride chloride, 3,3'4,4'-biphenyl tetracarboxylic acid dianhydride and at least one aromatic diamine selected from the group consisting of oxy-bisaniline and m-phenylene diamine, said trimellitic acid compound and said biphenyl tetracarboxylic acid anhydride being present in a mole ratio of from about 3:7 to about 9:1.
Claim 2
Dependent Claim
85 words
A fiber-reinforced composition comprising from about 5 to about 80 wt % of a reinforcing fiber and a polyamide-imide matrix resin derived from at least one trimellitic acid compound selected from the group consisting of trimellitic acid anhydride and 4-trimellitoyl anhydride chloride, 3,3'4,4'-biphenyl tetracarboxylic acid dianhydride and at least one aromatic diamine selected from the group consisting of oxy-bisaniline and m-phenylene diamine, said trimellitic acid compound and said biphenyl tetracarboxylic acid anhydride being present in a mole ratio of from about 3:7 to about 9:1.
Claim 3
Dependent Claim
13 words
The fiber-reinforced composition of claim 1 wherein said reinforcing fiber is carbon fiber.
Claim 4
Dependent Claim
56 words
In a composite composition comprising reinforcing fibers, a polyamide-imide matrix resin derived from trimellitic acid compounds and at least one aromatic diamine; and, optionally, fillers, flow improvers and thermoplastic resins, the improvement wherein said matrix resin comprises trimellitic acid compounds and biphenyl tetracarboxylic acid anhydride in a mole ratio of from about 3:7 to about 9:1.
Claim 5
Dependent Claim
56 words
In a composite composition comprising reinforcing fibers, a polyamide-imide matrix resin derived from trimellitic acid compounds and at least one aromatic diamine; and, optionally, fillers, flow improvers and thermoplastic resins, the improvement wherein said matrix resin comprises trimellitic acid compounds and biphenyl tetracarboxylic acid anhydride in a mole ratio of from about 3:7 to about 9:1.
Claim 6
Dependent Claim
17 words
The composite composition of claim 3 wherein said biphenyl tetracarboxylic acid anhydride are 3,3'4,4'-biphenyl tetracarboxylic acid anhydride.
Claim 7
Dependent Claim
22 words
The improved composition of claim 3, wherein the said aromatic diamine is selected from the group consisting of oxybisaniline and m-phenylene diamine.
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) | 1995-07-21 | 1996-01-20 | 1996-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-07-21 | 2000-01-20 | 2000-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-07-21 | 2004-01-20 | 2004-07-21 | $7700.00 | Window Closed / Lapsed |