Patent US4970292A successfully refreshed from Google Patents.
US4970292A
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US
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Amide-imide resin of lowered water absorption for molding and composite applications
Assignee: BP Corp North America Inc
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Filing: 1989-08-14
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Granted: 1990-11-13
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Expires: 2009-08-14
Abstract
Abstract Polyamide-imides 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 compound is replaced by a biphenyl tetracarboxylic acid compound.
Inventors
- 👤 Ronald E. Bockrath
- 👤 Robert B. Hanson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:50
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/14
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
38 words
A polyamide-imide copolymer comprising amide-imide units and imide-imide units, said units derived from trimellitic acid compounds and biphenyl tetracarboxylic acid compounds in a mole ratio of from about 3:7 to about 9:1, and at least one aromatic diamine.
Claim 2
Dependent Claim
38 words
A polyamide-imide copolymer comprising amide-imide units and imide-imide units, said units derived from trimellitic acid compounds and biphenyl tetracarboxylic acid compounds in a mole ratio of from about 3:7 to about 9:1, and at least one aromatic diamine.
Claim 3
Dependent Claim
37 words
The copolymer of claim 1 wherein said aromatic diamine has the structure H 2 N--Ar--NH 2 , wherein Ar is an aromatic carbocyclic radical selected from the group consisting of mononuclear aromatic radicals and polynuclear aromatic radicals.
Claim 4
Dependent Claim
52 words
The copolymer of claim 1 wherein said aromatic diamine has the structure H 2 N--Ar--NH 2 , wherein Ar is an aromatic radical selected from the group consisting of mononuclear radicals and polynuclear aromatic radicals having a plurality of aromatic carbocyclic radicals interconnected by a carbon-carbon bond or a divalent bridging group.
Claim 5
Dependent Claim
18 words
The copolymer of claim 3 wherein said aromatic radical is an aromatic radical represented by the structure ##STR5##
Claim 6
Dependent Claim
27 words
The copolymer of claim 3 wherein said polynuclear aromatic radical is an aromatic radical selected from the group consisting of aromatic radicals represented by the structures ##STR6##
Claim 7
Dependent Claim
38 words
The copolymer of claim 1 wherein said diamine is selected from the group consisting of m-phenylenediamine, p-phenylenediamine, diaminodiphenyl sulfone, oxy-bis-aniline, 4,4'-bis(aminophenyl) methane, 2,2-bis(4-(p-aminophenoxy)phenyl) propane, 2,2-bis(3,5-dichloro-4-(p-aminophenoxy)phenyl) propane, 2,2-bis(4-(p-aminophenoxy)phenyl) hexafluoropropane, 2,2-bis(4-(p-aminophenoxy)phenyl) hexafluoropropane, 2,2-bis(4-(m-aminophenoxy)phenyl) propane, 2,2-bis(4-aminophenoxy) biphenyl and 2,2-bis(4-p-aminophenoxy) phenyl ether.
Claim 8
Dependent Claim
19 words
The copolymer of claim 1 wherein said diamine is selected from the group consisting of oxy-bis-aniline and m-phenylene diamine.
Claim 9
Dependent Claim
80 words
A polyamide-imide copolymer comprising amide-imide units and imide-imide units, said units derived from (i) at least one trimellitic acid compound selected from the group consisting of trimellitic acid anhydride, and 4-trimellitoyl anhydride chloride; (ii) 3,3',4,4'-biphenyl tetracarboxylic acid dianhydride; and (iii) at least one aromatic diamine selected from the group consisting of oxy-bis-aniline and m-phenylene diamine; the mole ratio of said trimellitic acid compound and said biphenyl tetracarboxylic acid dianhydride being in the range of from about 3:7 to about 9:1.
Claim 10
Dependent Claim
80 words
A polyamide-imide copolymer comprising amide-imide units and imide-imide units, said units derived from (i) at least one trimellitic acid compound selected from the group consisting of trimellitic acid anhydride, and 4-trimellitoyl anhydride chloride; (ii) 3,3',4,4'-biphenyl tetracarboxylic acid dianhydride; and (iii) at least one aromatic diamine selected from the group consisting of oxy-bis-aniline and m-phenylene diamine; the mole ratio of said trimellitic acid compound and said biphenyl tetracarboxylic acid dianhydride being in the range of from about 3:7 to about 9:1.
Claim 11
Independent Claim
49 words
A method for improving the moisture resistance of a polyamide-imide comprising amide-imide units derived from a trimellitic acid compound and an aromatic diamine, said method comprising the step of replacing from about 30 to about 90 mole % of the trimellitic acid compound with a biphenyl tetracarboxylic acid compound.
Claim 12
Independent Claim
49 words
A method for improving the moisture resistance of a polyamide-imide comprising amide-imide units derived from a trimellitic acid compound and an aromatic diamine, said method comprising the step of replacing from about 30 to about 90 mole % of the trimellitic acid compound with a biphenyl tetracarboxylic acid compound.
Claim 13
Dependent Claim
15 words
The method of claim 9 wherein said biphenyl tetracarboxylic compound is 3,3',4,4'-biphenyl tetracarboxylic acid dianhydride.
References Cited (Backward Citations)
US4448957A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-11-12 | 1994-05-14 | 1994-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-11-12 | 1998-05-14 | 1998-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-11-12 | 2002-05-14 | 2002-11-13 | $7700.00 | Window Closed / Lapsed |