US4935502A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diazo compounds, a process for their preparation and their use as colorants
Assignee: Clariant Produkte Deutschland GmbH
•
Filing: 1989-08-22
•
Granted: 1990-06-19
•
Expires: 2009-08-22
Abstract
Abstract When a diamine of the formula ##STR1## in which n is 1 to 4, is bis-diazotized and the resulting bis-diazo compound is coupled with 2 moles of one or more coupling components of the formula ##STR2## in which R 1 is hydrogen, chlorine, bromine, methyl or methoxy and R 2 is hydrogen or, if R 1 is hydrogen, also methyl or ethyl, disazo compounds are obtained which are colorants. Due to their high fastness to light and to migration and their heat stability and dispersibility, these compounds are useful for pigmenting high molecular weight materials, especially polyolefins.
Inventors
- 👤 Rudolf Kuhne
- 👤 Heinrich Hamal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:38
CPC Classifications
C; C09; C09B; C09B35/00; C09B35/02; C09B35/039; C09B35/22; Y; Y10; Y10S; Y10S534/00; Y10S534/01
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
6 words
A compound of the formula ##STR7##
Claim 2
Dependent Claim
6 words
A compound of the formula ##STR7##
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) | 1993-06-18 | 1993-12-18 | 1994-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-18 | 1997-12-18 | 1998-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-18 | 2001-12-18 | 2002-06-19 | $7700.00 | Window Closed / Lapsed |