US3882085A
Expired / Lapsed
US
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Polyamide polymers from amino polyamide reactants
Assignee: Veba Oel AG
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Filing: 1972-06-05
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Granted: 1975-05-06
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Expires: 1992-06-05
Abstract
Abstract Polyamide-acid precursors for polyimide polymers, the precursors being condensates or mixtures of tricarboxylic or tetracarboxylic acids, anhydrides or esters and primary amines characterized in that the moiety corresponding to the primary amine is a residue of a primary aminopolyamide.
Inventors
- 👤 Karl Schmitt
- 👤 Fritz Gude
- 👤 Siegfried Brandt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:31
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/14
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
74 words
POLYAMIDE-PRECURSORS FOR POLYAMIDE POLYMERS, THE PRECURSORS BEING CONDENSATES OR MIXTURES OF CONDENSATES OF A TETRACARBOXYLIC ACID, ANHYDRIDE OR ESTER THEREOF WITH AT LEAST ONE AMINOPOLYAMIDE WHICH COMPRIESE THE CONDENSATE OF N+1 MOLS OF A DIAMINE OF THE FORMULA H2N-R-NH2, SAID DIAMINE SELECTED FROM THE GROUP CONSISTING OF 2,2,4TRIMETHYLHEXAMETHYLENE DIAMINE, 2,4,4TRIMETHYLHEXAMETHYLENE DIAMINE AND 1-AMINO-3AMINOMETHYL-3,5,5-TRIMETHYLCYCLOHEXANE WITH N MOLS OF AT LEAST ONE ACID SELECTED FROM THE GROUP CONSISTING OF A DICARBOXYLIC ACID AND AN AMINO ACID.
Claim 2
Dependent Claim
74 words
POLYAMIDE-PRECURSORS FOR POLYAMIDE POLYMERS, THE PRECURSORS BEING CONDENSATES OR MIXTURES OF CONDENSATES OF A TETRACARBOXYLIC ACID, ANHYDRIDE OR ESTER THEREOF WITH AT LEAST ONE AMINOPOLYAMIDE WHICH COMPRIESE THE CONDENSATE OF N+1 MOLS OF A DIAMINE OF THE FORMULA H2N-R-NH2, SAID DIAMINE SELECTED FROM THE GROUP CONSISTING OF 2,2,4TRIMETHYLHEXAMETHYLENE DIAMINE, 2,4,4TRIMETHYLHEXAMETHYLENE DIAMINE AND 1-AMINO-3AMINOMETHYL-3,5,5-TRIMETHYLCYCLOHEXANE WITH N MOLS OF AT LEAST ONE ACID SELECTED FROM THE GROUP CONSISTING OF A DICARBOXYLIC ACID AND AN AMINO ACID.
Claim 3
Dependent Claim
39 words
A polyamide-acid precursor according to claim 1 wherein the diamine is condensed with a dicarboxylic acid and said dicarboxylic acid is selected from the group consisting of adipic acid, sebacic acid, decane dicarboxylic acid, cyclohexane-1,4-dicarboxylic acid and terephthalic acid.
Claim 4
Dependent Claim
32 words
A polyamide-acid precursor according to claim 1, wherein said diamine is condensed with an amino acid and said amino acid is omega -aminoundecanic acid or the acid of E-caprolactam or laurin lactam.
Claim 5
Dependent Claim
39 words
A polyamide-acid precursor according to claim 1 wherein said tetracarboxylic acid anhydride or ester is selected from the group consisting of pyromellitic acid, pyromellitic acid dianhydride, tetrahydrofurantetracarboxylic acid, tetrahydrofurantetracarboxylic acid dianhydride, a pyromellitic acid diester and acetophenonetetracarboxylic acid dianhydride.
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) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |