US4165335A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Salts of dicarboxylic acids and diamines, having an improved color number, their manufacture and their use
Assignee: BASF SE
•
Filing: 1977-06-27
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Granted: 1979-08-21
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Expires: 1997-06-27
Abstract
Abstract Salts of alkanedicarboxylic acids of 4 to 12 carbon atoms and diamines of the formula H 2 N--R--NH 2 , where R is alkylene of 2 to 12 carbon atoms or is a radical of the formula ##STR1## which contain hydrazine hydrate, the manufacture of the salts in solution, and their use for the manufacture of nylons.
Inventors
- 👤 Hugo Strehler
- 👤 Ernst Dietl
- 👤 Georg Pilz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:11
CPC Classifications
C; C07; C07C; C07C55/00; C07C55/02; C07C55/20; C07C51/00; C07C51/41; C07C51/412; C07C51/42; C07C51/50; C07C55/14
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
61 words
Salts of alkanedicarboxylic acids of 4 to 12 carbon atoms and diamines of the formula H 2 N--R--NH 2 , where R is alkylene of 2 to 12 carbon atoms or is a radical of the formula ##STR7## which contain up to 100 ppm of hydrazine hydrate to improve the color number, yellowness index, periodate number and UV-number of the salts.
Claim 2
Dependent Claim
61 words
Salts of alkanedicarboxylic acids of 4 to 12 carbon atoms and diamines of the formula H 2 N--R--NH 2 , where R is alkylene of 2 to 12 carbon atoms or is a radical of the formula ##STR7## which contain up to 100 ppm of hydrazine hydrate to improve the color number, yellowness index, periodate number and UV-number of the salts.
Claim 3
Dependent Claim
26 words
Hexamethylenediammonium adipate which contains up to 100 ppm of hydrazine hydrate to improve the color number, yellowness index, periodate number and UV-number of the hexamethylenediammonium adipate.
Claim 4
Dependent Claim
26 words
Hexamethylenediammonium adipate which contains up to 100 ppm of hydrazine hydrate to improve the color number, yellowness index, periodate number and UV-number of the hexamethylenediammonium adipate.
Claim 5
Dependent Claim
26 words
Hexamethylenediammonium sebacate which contains up to 100 ppm of hydrazine hydrate to improve the color number, yellowness index, periodate number and UV-number of the hexamethylenediammonium sebacate.
Claim 6
Dependent Claim
26 words
Hexamethylenediammonium sebacate which contains up to 100 ppm of hydrazine hydrate to improve the color number, yellowness index, periodate number and UV-number of the hexamethylenediammonium sebacate.
Claim 7
Dependent Claim
19 words
Salts as set forth in claim 1, wherein the amount of hydrazine hydrate is from 5 to 100 ppm.
Claim 8
Dependent Claim
19 words
Salts as set forth in claim 1, wherein the amount of hydrazine hydrate is from 10 to 50 ppm.
References Cited (Backward Citations)
US2130947A
Cited
US2512632A
Cited
US3439025A
Cited
US3661982A
Cited
US3825586A
Cited
US3944598A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-08-20 | 1983-02-19 | 1983-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-08-20 | 1987-02-19 | 1987-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-08-20 | 1991-02-19 | 1991-08-21 | $7700.00 | Window Closed / Lapsed |