US3862088A
Expired / Lapsed
US
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Soluble aromatic copolyamides and threads thereof with a high modulus of elasticity and high tensile strength
Assignee: Bayer AG
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Filing: 1973-10-04
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Granted: 1975-01-21
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Expires: 1993-10-04
Abstract
Abstract AND 5 TO 50 MOL% OF STRUCTURAL UNITS CONTAINING HYDANTOIN RINGS AND HAVING THE GENERAL FORMULA The invention relates to copolyamides which have an extremely low water absorption capacity of 1 to 3.5 % but remarkably high tensile strengths of between 7 and 20 g/dtex and moduli of elasticity of between 500 and 11.000 kg.wt/mm2. The copolyamides comprise of from 50 to 95 mol.% of structural units of the general formula
Inventors
- 👤 Gerhard Dieter Wolf
- 👤 Hans Egon Kunzel
- 👤 Gunter Blankenstein
- 👤 Francis Bentz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:47
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/26; C08G69/32
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
33 words
The copolyamide as claimed in claim 1 in which, in the general formula I, one or more of R1 and R2 and R3 represent a C1 to C4 alkyl or an alkoxy group.
Claim 2
Dependent Claim
33 words
The copolyamide as claimed in claim 1 in which, in the general formula I of claim 1, one or more of R4 and R5 and R6 represent a C1 to C4 alkyl group.
Claim 3
Dependent Claim
37 words
The copolyamide as claimed in claim 1 in which, in the general formuala II of claim 1, Y, Y'', or both represents a bivalent aromatic group which comprises several aromatic rings joined together by -O-, -S-, -SO2-,
Claim 4
Dependent Claim
25 words
The copolyamide as claimed in claim 1 in which, in the general formula II of claim 1, R7 represents a C1 to C4 alkyl group.
Claim 5
Dependent Claim
28 words
The copolyamide as claimed in claim 1 in which, in the general formula I of claim 1, one or more of R1 and R2 and R3 represents chlorine.
Claim 6
Dependent Claim
36 words
The copolyamide as claimed in claim 1 in which, in the general formula I, R5, R6 or both represents a phenyl group, or a phenyl group substituted with chlorine or a C1 to C4 alkyl group.
Claim 7
Dependent Claim
36 words
The copolyamide as claimed in claim 1, which comprises from 70 to 90 mols-% of structural units of the general formula I and from 30 to 10 mols-% of structural units of the general formula II.
References Cited (Backward Citations)
US3671614A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-20 | 1978-07-22 | 1979-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-20 | 1982-07-22 | 1983-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-20 | 1986-07-22 | 1987-01-21 | $7700.00 | Window Closed / Lapsed |