| Patent Number |
Title Of Patent |
Date Issued |
| 7341607 |
Yellow anionic disazo dyes |
March 11, 2008 |
| The present invention relates to novel yellow anionic dyes, a process for their preparation, certain novel intermediates for their preparation and the use of these dyes for dyeing natural or synthetic materials, in particular, paper. |
| 7078497 |
Disazo dyes, and copper complexes thereof, for dyeing paper |
July 18, 2006 |
| The dyes of formula (1) according to claim 1 and the copper complexes of dyes of formula (2) according to claim 9 or the mixtures of mono-copper complex with the bis-copper complex are excellently suitable for dyeing paper with good light-fastness properties. |
| 6984723 |
Use of copper complexes of disazo dyes for dyeing natural and synthetic material |
January 10, 2006 |
| Use of the mono-copper complex of a dye of formula (1) wherein Z.sub.1, Z.sub.2, R.sub.1, R.sub.2, R.sub.3, R.sub.4, X, n and m are as defined in the claims, and mixtures thereof with the bis-copper complex of such a dye, for dyeing natural and synthetic material. |
| 6860906 |
Process for preparing solutions of anionic organic compounds |
March 1, 2005 |
| Described is a process for preparing concentrated solutions or suspensions of anionic organic compounds which comprises a) acidifying an aqueous solution or suspension of an anionic organic compound containing salts and/or impurities to a pH of 4.5 or less, if the pH is above this value, |
| 6719906 |
Process for the preparation of solutions of anionic organic compounds |
April 13, 2004 |
| A process for the preparation of concentrated solutions or suspensions of anionic organic compounds is described, which process comprises a) acidifying an aqueous solution or dispersion of an anionic organic compound that comprises salts and/or impurities to a pH of 4.5 or less, if th |
| 6635092 |
Dye mixtures |
October 21, 2003 |
| Disclosed are dye mixtures for shading white paper which may contain fluorescent brightener. The dye mixtures comprise a violet dye according to the formula (1) or (2) indicated in claim 1 and sufficient of a red, blue or further violet anionic azo dye that this dye mixture is capable of |
| 5674299 |
Process for dyeing paper |
October 7, 1997 |
| The cationic or basic dyes of formulae (1) and (2) cited in claim 1 are particularly suitable for dyeing paper.These dyes dye paper in a yellow, orange or brown shade having good fastness properties. |
| 5635607 |
Cationic or basic azo dyes consisting of an amino benzothiazole diazo component and a disubstitu |
June 3, 1997 |
| The cationic or basic aminobenzothiazole dyes disclosed herein are particularly suitable for dyeing paper.Paper is dyed with these dyes in blue or violet shades of good fastness properties. |
| 5559217 |
Disazo dyes and a process of dyeing paper therewith |
September 24, 1996 |
| The dyestuffs of the formula ##STR1## in which A, R.sub.1, M and n are as defined in claim 1, are suitable for dyeing paper with good light-fastness. |
| 5554738 |
Acyl-aryl disazo having a 6-ureido-1-hydroxy-naphthalene-3-sulfonic acid coupling component |
September 10, 1996 |
| Anionic disazo dyes useful for dyeing and printing textile materials, paper and leather and for the preparation of inks of the formula ##STR1## wherein D, R.sup.3, R.sup.4, M, R.sup.5 and R.sup.7 are defined as in the specification. |
| 5545725 |
Disazo dyes consisting of two monoazo dyes contaning a 1-phenyl-5-amino pyrazole coupling compon |
August 13, 1996 |
| Disazo dyes are disclosed which are particularly suitable for dyeing paper.Paper is dyed with these dyes in greenish-yellow or yellow to red shades of good fastness properties. |
| 5487761 |
Process for dyeing paper with disazo dyes |
January 30, 1996 |
| The dyestuffs of the formula ##STR1## in which A, R.sub.1, M and n are as defined in claim 1, are suitable for dyeing paper with good light-fastness. |
| 5288294 |
Process for dyeing paper with disazo dyes |
February 22, 1994 |
| The dyes of formula ##STR1## wherein X, Y and M are as defined in claim 1, are suitable for dyeing paper with good lightfastness. |
| 5211719 |
Concentrated acqueous solutions of anionic disazo dyes with polyglycol-amine |
May 18, 1993 |
| Concentrated aqueous solutions are described comprising specific anionic disazo dyes and polyglycol amines, which are highly suitable as commercial forms. |
| 5203876 |
Process for dyeing paper |
April 20, 1993 |
| The dyes of formula ##STR1## wherein R, M and n are as defined in claim 1, are preeminently suitable for dyeing paper in blue shades. |
| 5049238 |
Method of dyeing paper utilizing trisazo dyes |
September 17, 1991 |
| A method of dyeing paper utilizing dyes suitable for dyeing paper in blue shades having the formula ##STR1## wherein R is hydrogen, --OH, --OR.sup.1 , --NH.sub.2, NHR.sup.1, --NHCOR.sup.1, --NHSO.sub.2 R.sup.1, --NHCONH.sub.2 or --NHCONHR.sup.1, in which R.sup.1 is unsubstituted |
| 4818247 |
Reactive azo dyes carrying two amine-fluoro-triazinyl groups for dyeing and printing cotton |
April 4, 1989 |
| Reactive dyes of the formula ##STR1## in which D is the radical of a diazo component of the benzene, naphthalene, azobenzene, naphthylazobenzene, azonaphthalene or phenylazonaphthalene series, K is the radical of a coupling component of the benzene or naphthalene series or of the |
| 4804767 |
Process for the preparation of disperse dyes |
February 14, 1989 |
| Dyes of formula (1) as claimed in claim 1 can conveniently be prepared by reacting an anthraquinone compound of formula (2) with a haloformate of formula (3) in an inert organic solvent and in the presence of 1 to 2 moles of a heterocyclic tertiary nitrogen base per mole of compound of |
| 4515599 |
Process for dyeing paper |
May 7, 1985 |
| A process for dyeing paper which comprises the use of dyes of the formula ##STR1## wherein R is hydrogen, hydroxyl or amino, X is the azoxy or azo group, and n is 1 or 2, and the bonds of the complexing oxygen atom in the .alpha.-position and of the azo group in the .beta.-position a |
