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US5034017A
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Process for the coloring of paper with disazo dyes containing sulfonated-naphthol groups to give fast blue shades
Assignee: Bayer AG
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Filing: 1990-03-21
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Granted: 1991-07-23
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Expires: 2010-03-21
Abstract
Abstract Dyestuffs of the formula ##STR1## in which the substituents have the meanings given in the description are highly suitable for the coloration of paper. They produce light and wetfast blue coloring.
Inventors
- 👤 Klaus Kunde
- 👤 Peter Wild
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:16
CPC Classifications
D; D21; D21H; D21H21/00; D21H21/14; D21H21/28; Y; Y10; Y10S; Y10S8/00; Y10S8/916; Y10S8/919
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
54 words
Process for the coloring of paper, characterized in that dyestuffs of the formula are used in which X is H, OH, C 1 -C 4 -alkoxy or --NHR 3 R 1 , C 1 -C 4 -alkyl R 2 , R 3 are H, alkyl, alkylcarbonyl, alkylsulphonyl, aryl, arylcarbonyl, arylsulphonyl, aralkyl, aralkylcarbonyl or aminocarbonyl.
Claim 2
Dependent Claim
54 words
Process for the coloring of paper, characterized in that dyestuffs of the formula are used in which X is H, OH, C 1 -C 4 -alkoxy or --NHR 3 R 1 , C 1 -C 4 -alkyl R 2 , R 3 are H, alkyl, alkylcarbonyl, alkylsulphonyl, aryl, arylcarbonyl, arylsulphonyl, aralkyl, aralkylcarbonyl or aminocarbonyl.
Claim 3
Dependent Claim
93 words
Process according to claim 1, characterized by the use of dyestuffs of the formula of claim 1 in which R 1 is H, C 1 -C 4 -alkyl, R 2 R 3 are H, C 1 -C 4 -alkyl, C 1 -C 4 -alkylcarbonyl, C 1 -C 4 -alkylsulphonyl, aminocarbonyl, phenylcarbonyl, phenyl, phenylsulphonyl, benzylcarbonyl, it being possible for the phenyl rings, to be substituted by SO 3 H or COOH, X is H, C 1 -C 4 -alkoxy, --NHR 3 , the dyestuffs having at least 3 sulpho groups in the naphthalene rings.
Claim 4
Dependent Claim
31 words
Process according to claim 1, characterized by the use of dyestuffs of the formula ##STR9## in which R 4 is OH, OCH 3 , OC 2 H 5 , and ##STR10##
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) | 1994-07-22 | 1995-01-21 | 1995-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-22 | 1999-01-21 | 1999-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-22 | 2003-01-21 | 2003-07-23 | $7700.00 | Window Closed / Lapsed |